Skip to main content
Erschienen in: Arthritis Research & Therapy 1/2017

Open Access 01.12.2017 | Research article

Bortezomib treatment induces a higher mortality rate in lupus model mice with a higher disease activity

Erschienen in: Arthritis Research & Therapy | Ausgabe 1/2017

Abstract

Background

Bortezomib (Bz) is a proteasome inhibitor that directly targets antibody-producing plasma cells. We recently reported the first randomized control trial that evaluated the effects of Bz in patients with systemic lupus erythematosus (SLE). In that study, we demonstrated that Bz treatment is associated with many adverse reactions in patients with refractory disease. In the present study, we examine the therapeutic and toxic effects of Bz on MRL/MpJ-lpr/lpr (MRL/lpr) mice with severe disease activity.

Methods

Female MRL/lpr mice at 10 and 14 weeks of age were treated with phosphate buffered saline (PBS) (n = 19), Bz (750 μg/kg twice weekly) (n = 27), or cyclophosphamide (Cyc) (1 mg/body, once in 2 weeks) (n = 20). Cellular subsets, serum immunoglobulin, anti-double-stranded DNA (anti-dsDNA) antibody titer, and a pathological index of glomerulonephritis were then analyzed at 22 weeks of age. Survival curves of the 10-week-old and 14-week-old Bz-treated groups were compared. Blood counts, creatinine, liver enzymes, and serum cytokine levels were measured 1 week after Bz treatment. Gene expression profiling of spleens from Bz and Cyc treatment mice were compared with those from control mice.

Results

The anti-dsDNA antibody levels were significantly higher in 14-week-old than in 10-week-old mice, indicating a higher disease activity at 14 weeks. A significant decrease in the number of splenic cells and glomerulonephritis index was observed in Bz-treated and Cyc-treated mice. Bz, but not Cyc, significantly decreased serum immunoglobulin and anti-dsDNA antibody titer levels. Survival curve analysis revealed a significantly higher mortality rate in 14-week-old than in 10-week-old Bz-treated and control groups. Following two injections of Bz, serum IL-6 and TNF-α levels were significantly more elevated in 14-week-old than in 10-week-old mice. Potentially immunogenic molecules, such as heat shock proteins, were characteristically upregulated in spleens of Bz-treated but not Cyc-treated mice.

Conclusions

In spite of its therapeutic effect, Bz treatment had more toxic effects associated with increased proinflammatory cytokine levels in mice with a higher disease activity. Understanding the mechanism of the toxicity and developing preventive strategies against it is important for the safe clinical application of Bz in human SLE.
Begleitmaterial
Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s13075-017-1397-7) contains supplementary material, which is available to authorized users.
Abkürzungen
ALT
Alanine aminotransferase
anti-dsDNA
Anti-double-stranded DNA
AST
Aspartate aminotransferase
BSA
Bovine serum albumin
Bz
Bortezomib
Cr
Creatinine
Cyc
Cyclophosphamide
DAMP
Damage associated molecular protein
Dex
Dexamethasone
ER
Endoplasmic reticulum
GADD45
Growth arrest and DNA damage inducible 45
GAPDH
Glyceraldehyde-3-phosphate dehydrogenase
HSP
Heat shock protein
IFN-γ
Interferon gamma
IgG
Immunoglobulin G
IgM
Immunoglobulin M
IL-6
Interleukin-6
PBS
Phosphate buffered saline
RBC
Red blood cell
SCID
Severe combined immunodeficiency disease
SLE
Systemic lupus erythematosus
Sta
Staurosporine
TNF-α
Tumor necrosis factor alpha
WBC
White blood cell

Background

In systemic lupus erythematosus (SLE), autoreactive antibodies, such as anti-dsDNA antibodies, are considered to trigger tissue inflammation [1]. One therapeutic approach is to diminish the production of pathogenic antibodies. Toward this goal, several experimental therapeutic strategies have targeted molecules involved in pathways that control B-cell activation into plasma cells [2, 3]. It is noteworthy that some SLE patients are refractory to conventional therapies, and thus require high doses of steroids, which are associated with many side effects.
Bortezomib (Bz) is a proteasome inhibitor that enhances the accumulation of unfolded proteins with the induction of ER stress, leading to apoptotic cell death [4]. Plasma cells that synthesize high levels of immunoglobulins have relatively high sensitivity to Bz [5], which partly explains the clinical success of Bz in treating multiple myeloma [6]. Bz has been reported to inhibit the production of anti-dsDNA antibody and improve glomerulonephritis, proteinuria, and survival of lupus model mice, such as NZB/W [712] and MRL/lpr [7, 13, 14] mice. Recently, Bz treatment has been reported to be effective in treating human SLE [15, 16]. Our group was the first to report a randomized control study on the effects of Bz in patients with active lupus [17]. In that study, all patients with Bz treatment developed fever within 1 week of Bz administration. In order to safely use Bz to treat patients with refractory SLE, we need to clarify its mechanisms of toxicity in order to devise preventive strategies to mitigate its adverse effects.
MRL/lpr mice bearing Fas mutation on the MRL background spontaneously develop pathological lesions, such as glomerulonephritis, systemic vasculitis, arthritis, and sialoadenitis, as well as splenomegaly and lymphadenopathy [18]. Glomerulonephritis is characterized by endocapillary proliferative and wire loop lesions, which resemble lupus nephritis. MRL/lpr mice also have deposition of immunoglobulins in tissue lesions, especially in glomeruli, associated with serological abnormalities, such as increased anti-dsDNA antibodies and anti-Sm antibodies [19], rheumatoid factor [20], IgG3 [21], and skewed Th1 cytokine levels [22, 23]. Because the inoculation of hybridoma clones generated from splenic B cells from MRL/lpr mice into SCID mice could induce various glomerular lesions involving a endocapillary proliferative and a wire loop type [2427], MRL/lpr mice are considered suitable models for antibody-mediated diseases and thus have been used to elucidate the efficacy of various drugs for SLE [2832].
In the present study, we demonstrated that immunological activity was higher in 14-week-old than 10-week-old MRL/lpr mice, that Bz treatment was associated with a higher mortality rate in 14-week-old than in 10-week-old MRL/lpr mice, and that, in spite of its therapeutic effects on antibody production, Bz treatment causes significantly elevated serum levels of IL-6 and TNF-α in 14-week-old MRL/lpr mice.

Methods

Mice and drug administration

Eight-week-old female MRL/lpr mice were purchased from Jackson Laboratories (Bar Harbor, ME, USA). The mice were housed and maintained in the animal facilities of Tohoku University School of Medicine. Bz was purchased from Santa Cruz (Dallas, TX, USA) and prepared at a concentration of 10 mg/ml. Cyclophosphamide (Cyc) was purchased from Sigma-Aldrich (St. Louis, MO, USA) and prepared at a concentration of 5 mg/ml. We injected the mice subcutaneously with Bz (750 μg/kg body) twice weekly or intraperitoneally with Cyc (1 mg/body = 30–35 mg/kg) once in 2 weeks at the ages indicated. Control mice were injected subcutaneously or intraperitoneally with the same volume of phosphate buffered saline (PBS) instead of Bz and Cyc, respectively. The mice were euthanized by cervical dislocation at the specified ages, and samples were analyzed for immunological activities and to assess the effects and toxicities of drugs. The study protocols were reviewed by the Institutional Laboratory Animal Care and Use Committee of Tohoku University, and finally approved by the President of University.

Flow cytometry

Bone marrow, spleen, and axillary lymph nodes were minced in Hank’s balanced solution and filtered through a 70-μm cell strainer (Falcon, Tewksbury, MA, USA) to prepare single-cell suspensions. After red blood cell (RBC) lysis with 1× RBC lysis buffer (eBioscience, San Diego, CA, USA), the cells were first stained with the following antibodies for 20 min on ice: PE-anti-Thy1.2 (clone 53-2.1; BD Biosciences, San Jose, CA, USA), PerCP-Cy5.5-anti-CD4 (clone RM4-5; BD Biosciences), APC-anti-CD138 (clone 281-2; BD Biosciences), PE-Cy7-anti-CD8 (clone 53-6.7; BD Biosciences), APC-Cy7-anti-CD19 (clone 6D5; BD Biosciences), and ViroGreen-anti-B220 (clone RA3-6B2; Miltenyi, Teterow, Germany). After washing with PBS containing 1% bovine serum albumin (BSA; Sigma-Aldrich), the cells were fixed with Cytofix/Cytoperm Fixation (BD Biosciences) and permeated with permeabilization solution (BD Biosciences). Second, the cells were stained intracellularly with Horizon450-anti-IgL-κ antibody for 30 min. Flow cytometric analysis was performed using FACSCanto II with FACS Diva (BD Biosciences). Acquired data were analyzed with FlowJo software (Tree Star Inc., Ashland, OR, USA). Absolute cell numbers were calculated based on the frequency of the cell population and the total cell number of each organ. Each cell population was defined as follows: B cells as CD19+, plasma cells as CD138+IgL-κ+, CD4 T cells as CD4+CD8Thy1.2+, CD8 T cells as CD4CD8+Thy1.2+, and lpr T cells as CD4CD8Th1.2+B220+.

Serum immunoglobulin subclasses and anti-dsDNA antibody titer

For the study, 96-well ELISA plates (Costar, Corning, NY, USA) were coated overnight with goat anti-mouse Ig antibody (SouthernBiotech, Birmingham, AL, USA) or with calf thymus DNA (20 μg/ml) treated with S1 nuclease (Sigma). After washing three times with PBS containing 0.1% Tween 20, ELISA plates were blocked with 100 μl of Syn Block (ImmunoChemistry, Bloomington, MN, USA) for 2 h at room temperature. Mouse serum diluted with PBS containing 1% BSA and 0.1% Tween 20 was added to the plates at 50 μl/well and incubated for 1.5 h at room temperature. After washing three times, each immunoglobulin-specific or anti-dsDNA antibody-specific antibody was detected with horseradish peroxidase-anti-mouse IgG1, IgG2a, IgG2b, IgG3, IgM (Abcam, Cambridge, UK), or IgG (Rockland, Limerick, PA, USA) antibody and TMB liquid (Sigma). The plates were analyzed with ELISA plate reader iMARK (Bio-Rad, CA, USA). Optical densities for anti-dsDNA antibody were converted to arbitrary units based on the reference serum of 38-week-old MRL/lpr mice. Optical densities for each immunoglobulin subclass were converted to milligrams per deciliter based on the reference mouse serum with known concentrations of each immunoglobulin (Bethyl, Montgomery, TX, USA).

Histopathological analysis of glomerulonephritis

Kidney samples obtained from the mice were fixed with 10% formalin and embedded in paraffin. The samples were stained with hematoxylin and eosin. Histopathological examinations for glomerulonephritis are described elsewhere [33]. The following criteria were used for grading each glomerulus: grade 0, no recognizable lesion in a glomerulus; grade 1, mild cell proliferation and/or cell infiltration; grade 2, the same as grade 1 with mesangial proliferation, lobulation, and hyaline droplet; and grade 3, the same as grade 2 with crescent and granuloma formation and/or hyalinosis. The reader, who was blinded to whether the specimens were from control or drug-treated mice, obtained 20 glomeruli from one mouse. The glomerulonephritis index of an individual mouse was expressed as the mean of the grading of 20 glomeruli. For immunofluorescence, kidneys were snap-frozen in OCT compound (Sakura Finetek, USA) before sectioning. Cryostat sections were stained with FITC-goat anti mouse IgG antibody and observed on a BZ-8000 T fluorescent microscope (Keyence, Tokyo, Japan).

Complete blood count and serum biochemical analysis

Complete blood count was performed using Microsemi LC-662 (Horiba-seisakusho, Tokushma, Japan). Serum creatinine (Cr), aspartate aminotransferase (AST), alanine aminotransferase (ALT), uric acid, calcium, and phosphate levels were quantified using standard laboratory methods (Nagahama Life Science Laboratory, Shiga, Japan).

Cytokines

Serum concentrations of IFN-γ, IL-6, and TNF-α were measured with a cytokine Cytometric Beads Array (BD Biosciences) following the manufacturer’s instruction. The concentration of each cytokine was calculated with FCAP Array Version 3.0 (BD Biosciences).

Microarray

Fourteen-week-old MRL/lpr mice were injected with Bz (750 μg/kg subcutaneously), Cyc (1 mg/body intraperitoneally), or PBS. The mice were sacrificed, and the spleens were removed 6 h after injecting the drugs. RNA was extracted from the spleen samples using RNAiso Plus (TaKaRa Biotech, Shiga, Japan) and cleaned up with the RNeasy MiniElute Cleanup kit (QIAGEN) according to the manufacturer’s instructions. Cyanine-3-labeled cRNA was prepared from 0.1 μg total RNA using the Low Input Quick Amp Labeling Kit (Agilent Technologies, Santa Clara, CA, USA) and hybridized to a SurePrint G3 Mouse GE 8 × 60 K Microarray (Agilent Technologies) according to the manufacturer’s instructions. Gene expression profiling of Bz-treated and Cyc-treated mice were compared with control mice using Gene Spring software (Agilent Technologies). Genes that significantly increased (>2-fold) or decreased (<0.5-fold) in expression were considered for analysis. The genes with significantly changed expressions were studied with Ingenuity Pathway Analysis (IPA) for canonical pathways.

In-vitro induction of HSPA1A and HSPB1

Cell suspensions were prepared from axillary lymph nodes harvested from 10-week-old and 14-week-old female MRL/lpr mice. Lymph node cells were seeded in 24-well plates at a density of 1.0 × 106/well. The cells were then treated with Bz (100 μM) and staurosporine (100 μM) (Sigma) in RPMI 1640 (Cellgro) supplemented with 10% FCS, penicillin (100 IU/ml), and streptomycin (100 μg/ml). After 6 hours of incubation, total RNA was extracted using Trizol (Invitrogen, Carlsbad, CA, USA) and cDNA was synthesized using the ReverTra Ace qPCR RT Kit (Toyobo, Tokyo, Japan). PCR was performed with 5 μl of cDNA sample and 15 μl of PCR solution from the Quantifect SYBR Green PCR Kit (QIAGEN), containing 200 nM of sense and anti-sense primers, respectively. The primer sequences were as follows: GAPDH: sense 5′-TGCCCCCATGTTTGTGATG-3′ and anti-sense 5′-TGTGGTCATGAGCCCTTCC-3′; HSPA1A1 (HSP70): sense 5′-TGTTCGAGGGCATCGACTTCT-3′ and anti-sense 5′-TGATGCTCTTGTTCAGGTCGC-3′; and HSPB1 (HSP27): sense 5′-CACTGGCAAGCACGAAGAAAG-3′ and anti-sense 5′-GGCCTCGAAAGTAACCGGAAT-3′.
Using a CFX96 Real-Time Detection System (BioRad, Hercules, CA, USA), PCR mixtures were incubated for 15 min at 95 °C, and then amplified for 40 cycles for 10 sec at 95 °C, 30 sec at 60 °C, and 30 sec at 72 °C. Gene copy numbers were calculated by comparing Ct values of each sample with a standard curve, which was generated by amplifying serially diluted plasmid samples containing the relevant sequences.

Statistical analysis

For calculation of statistical significance, the paired Student’s t test, nonparametric Mann–Whitney test, or one-way ANOVA analyses with Turkey post-hoc test was used as indicated. Statistical analysis was performed with Graphpad Prism 7 software. p < 0.05 was considered statistically significant. Results were depicted as median with quartile range or mean value ± SEM, as indicated.

Results

Comparison of 10-week-old and 14-week-old MRL/lpr mice

We tried to examine the effects of Bz on MRL/lpr mice with higher disease activity. First, to determine the age at which the mice developed early or advanced stage disease, we compared the disease activity of MRL/lpr mice at 10 and 14 weeks of age. As shown in Fig. 1a, the spleens and lymph nodes of 14-week-old mice were heavier than those of the 10-week-old mice. Flow cytometric analysis revealed significantly more B cells, plasma cells, CD4 T cells, CD8 T cells, and lpr T cells in the spleens, lymph nodes, and bone marrow of 14-week-old than 10-week-old mice. However, the lymph node plasma cells were identical (Fig. 1b). Among these cell populations, lpr T cells showed remarkable accumulation into spleens (14.5-fold) and lymph nodes (92.6-fold) of 14-week-old compared with 10-week-old mice. Serological analysis revealed that serum levels of IgG1, IgG2a, IgG3, and anti-dsDNA antibody were significantly higher in the 14-week-old than in the 10-week-old mice. IgG2b and IgM were, however, not significantly different between the groups (Fig. 1c). In contrast to serological and cytological analysis, a pathological index for glomerulonephritis and proteinuria were not significantly different between the 10-week-old and 14-week-old mice (Fig. 1d). These data suggest that MRL/lpr mice at 14 weeks of age showed more immunological activity than those at 10 weeks of age.

Therapeutic effect of Bz on 14-week-old MRL/lpr mice

To examine the therapeutic effect of Bz on serologically active mice, we compared 22-week-old MRL/lpr mice treated with Bz and Cyc from 14 weeks of age, at 2 days after the last injection of Bz and Cyc. Both Bz and Cyc treatments significantly reduced the splenomegaly and lymphadenopathy in MRL/lpr mice compared with the control mice (Fig. 2a). In spleens, the frequencies of plasma cells were decreased in Bz-treated mice and the frequencies of lpr T cells among Thy1.2+ T cells were reduced in both Bz-treated and Cyc-treated mice (Fig. 2b). Bz significantly decreased the number of B cells, plasma cells, CD4 T cells, CD8 T cells, and lpr T cells in MRL/lpr mice compared with the control mice (Fig. 2c). Among these cell subsets, plasma cells and lpr T cells were drastically reduced by Bz treatment (4.24% and 9.25% of control, respectively). Cyc also more significantly decreased the number of lpr T cells in MRL/lpr mice than in control mice (Fig. 2c). These results indicate that plasma cells and lpr T cells have higher sensitivities to Bz treatment than the other cellular subsets. Serum levels of Ig subclasses and anti-dsDNA antibody were markedly reduced by Bz treatment. On the other hand, Cyc treatment showed changes in the serological level of anti-dsDNA antibody and Ig subclasses in a variable manner but did not induce a significant decrease in either of them (Fig. 3a). Bz and Cyc treatment markedly decreased cellular invasion in or around the glomeruli and diminished the glomerular deposition of immunoglobulins (Fig. 3b). These findings were associated with improved histopathological indexes of glomerulonephritis (Fig. 3c). Taken together, administration of Bz to 14-week-old MRL/lpr mice attenuated the serological and pathological disease activity at 22 weeks of age. Although Bz treatment for 14-week-old mice (n = 27) suppressed their immunological activity, 11 mice unexpectedly died within 22 weeks of age.

Survival curve

Next, to examine whether the lethal toxic effects of Bz depend on the disease activity, we compared the survival curve of mice treated with Bz from 10 weeks or 14 weeks of age. Within 4 weeks after the initiation of Bz treatment, 33% of the mice died (Fig. 4a). Kaplan–Meier survival curve analysis revealed that Bz treatment from 14 weeks old significantly decreased the survival rate of mice, compared with control, Bz treatment from 10 weeks old, and Cyc treatment from 14 weeks old. In spite of the therapeutic effects shown in Figs. 2 and 3, Bz treatment exerted lethal toxic effects on immunologically active mice and not on less active younger mice. The mice survival rate, after discontinuing Bz treatment (14wkBz → PBS), significantly improved (Fig. 4a) even comparable with control mice, although anti-dsDNA antibody levels increased again after the discontinuation of Bz treatment at 18 weeks of age (Fig. 4b).

Early toxic effects of Bz within 1 week

We assumed that Bz exerted its lethal toxic effects early on 14-week-old mice after the initiation of treatment. Therefore, blood samples from mice treated twice with Bz at 10 or 14 weeks of age were analyzed (10wkBz and 14wkBz, respectively). White blood cells were increased, whereas hemoglobin levels were significantly decreased after Bz treatment of 14-week-old mice (Fig. 5a). However, platelets were significantly diminished by Bz treatment in both 10-week-old and 14-week-old mice (Fig. 5a). Serum AST was significantly elevated after Bz treatment of 14-week-old mice (Fig. 5b). Serum levels of IFN-γ were significantly higher in 14-week-old than in 10-week-old mice (Fig. 5c), mirroring the increased immunological activity. Bz treatment of mice at both 10 and 14 weeks of age significantly elevated serum IL-6 and TNF-α levels, but IFN-γ levels were not significantly changed by Bz treatment at 14 weeks of age. The increase in serum IL-6 and TNF-α levels was significantly higher in 14wkBz than in 10wkBz mice (Fig. 5c). These data suggest that Bz treatment at 14 weeks of age induced more inflammatory cytokine release than treatment at 10 weeks of age.

Late toxic effects of Bz

Next, to examine the toxic effects of long-term treatment with Bz, MRL/lpr mice were treated from 10 or 14 weeks of age, and blood analysis was performed at 18 weeks of age. In this experiment, five of 14 mice started on Bz at 14 weeks of age died before 18 weeks, which is consistent with the data in Fig. 3a. None of the controls and mice treated at 10 weeks of age died during this period. At 18 weeks of age, Bz treatment from 10 weeks (10wkBz-18wk) and 14 weeks (14wkBz-18wk) did not show a significant difference in blood counts (Fig. 6a) and Cr and AST levels (Fig. 6b). ALT was slightly increased, whereas both IL-6 and TNF-α were significantly decreased by Bz treatment (Fig. 6b, c).

Comparison of gene expression profiling in spleens from Bz-treated and Cyc-treated mice

To elucidate the differences in the effects of Bz and Cyc on mice, gene expression profiles of spleens were compared using microarray analysis. Six hours after Bz or Cyc treatment, 74 genes with >2-fold increase and 102 genes with <0.5-fold decrease in Bz-treated mice and 49 genes with >2-fold increase and three genes with <0.5-fold decrease in Cyc-treated mice were uncovered (Table 1, Additional file 1). No common genes were significantly changed in both Bz-treated and Cyc-treated mice. The 70-kDa heat shock protein 1A (HSPA1A) was remarkably increased in Bz-treated mice (100.3-fold) (Table 1). Pathway analysis performed with IPA software revealed that upregulation and downregulation of some genes were significantly associated with distinct canonical pathways, supporting the different mechanisms of each drug (Additional file 2). The protein ubiquitin pathway was most significantly associated with Bz treatment (p = 0.000692) (Additional file 2), whereas the growth arrest and DNA damage inducible 45 (GADD45) and DNA damage-induced 14-3-3 signaling pathways were most significantly associated with Cyc treatment (p = 0.000575) (Additional file 2). The expression of some genes of the HSP family and proteasome subunit proteins was significantly increased in the protein ubiquitin pathway, whereas that of the genes of cyclin E2 (CCNE2) and cyclin dependent kinase 1 (CDK1) was significantly increased in the GADD45 and DNA damage-induced 14-3-3 signaling pathways (Additional file 3).
Table 1
Top 20 genes upregulated in the spleen by bortezomib or cyclophosphamide treatment relative to control mice
Bortezomib
Cyclophosphamide
Symbol
Fold change
Symbol
Fold change
HSPA1A
100.3
Dynap
17.7
UCHL1
38.3
Akr1c20
8.74
RNF207
23.2
CCSER1
6.63
TRIB3
21.2
AURKB
6.50
HSPB1
20.6
Olfr123
6.38
GDF15
14.9
ARHGAP19
6.13
CHAC1
9.32
NXF3
6.01
AFP
7.44
LRRC72
5.85
TRIM6
6.81
Cmtm2a
5.83
STMN4
6.36
CDK1
5.79
AOX1
6.12
LIPC
5.04
HSPB8
5.93
ASIC3
4.51
MAP1A
5.77
CCNE2
4.434
SRXN1
5.56
Serpinb6d
4.21
COMP
5.55
Gm9372
3.84
DNAH10
5.42
CEACAM20
3.63
CALR3
5.36
Gm10753
3.60
DYNC1I1
5.04
SPRY4
3.54
ATF3
4.95
EPB41L4B
3.43
KIF1A
4.93
Gm5093
3.40

In-vitro induction of heat shock protein gene expression in Bz-treated lymph node cells

As shown in the gene list presented in Table 1, HSPA1A (HSP70) and HSPB1 (HSP27), which stimulate the innate immune system [3437], were significantly increased. We examined whether the induction of these genes was characteristic to Bz treatment. Lymph node cells from 10-week-old and 14-week-old MRL/lpr mice were stimulated with Bz and protein kinase inhibitor staurosporine (Sta), which was used as another apoptosis inducer. Incubation of lymph node cells with Bz significantly increased HSPA1A and HSPB1 expression when compared with that in the control mice, whereas Sta did not affect the expression (Additional file 4).
Six hours after injection of vehicle (control, n = 4), Bz (n = 4), or Cyc (n = 3) drugs into the 14-week-old mice, mRNA from the spleens was analyzed with the SurePrint G3 Mouse GE 8 × 60 K Microarray (Agilent Technologies). Compared with the control mice, significantly increased (>2-fold) and decreased (<0.5-fold) genes were extracted using Gene Spring software. The top 20 increased genes are presented in Table 1.

Discussion

Patients with SLE with high disease activity who are refractory to conventional treatments require novel therapies. The proteasome inhibitor Bz is a potential novel therapeutic agent for SLE. In this study, we showed that the disease activity of MRL/lpr mice progressed from 10 to 14 weeks of age and was significantly decreased by Bz treatment. However, Bz treatment also increased the mortality rate of mice with high disease activity status, in spite of its therapeutic effects. The mechanism mediating the high mortality and toxicities needs clarification for the safe clinical application of Bz in patients with SLE.
MRL/lpr mice with a higher disease activity showed a significant increase in the number of B cells, plasma cells, CD4+ T cells, CD8+ T cells, and lpr T cells in the spleen and bone marrow. The same was observed in the lymph nodes, except for the plasma cells (Fig. 1b). The major cell source for splenomegaly and lymphadenopathy was the accumulation of a large number of lpr T cells, which are double negative, polyclonal, and nonneoplastic [38]. The origin of lpr T cells remains unclear [39] and how lpr T cells functionally contribute to autoimmunity on the MRL background is also unknown. Bobe et al. [30] reported that arsenic trioxide exerted a selective cytotoxic effect on lpr T cells. Although the mechanism is unclear, lpr T cells with a defective intrinsic Fas-mediated apoptotic pathway might be sensitive to external cellular stress. MRL/lpr mice at 14 weeks of age were burdened with high lpr T cells that appear relatively vulnerable to Bz cytotoxic effects as well as plasma cells, including induction of secondary necrosis and apoptosis or necroptosis as described previously [40].
Consistent with previous reports [714], Bz had a therapeutic effect even in advanced lupus (14-week-old MRL/lpr mice), resulting in marked decreases in serum immunoglobulins and anti-dsDNA antibodies and improved glomerulonephritis. Several groups have reported improved survival rates in Bz-treated NZW/B [7, 9, 10, 13, 14] and MRL/lpr [7, 14] mice. However, these results for the survival rates were not consistent with the present study. The reason for this contradiction might be due to the differences in mouse age, disease activity, or just mouse strains. In our study, Bz treatment of MRL/lpr mice was initiated at 14 weeks of age, which is later than in previous reports [7, 14], designed to examine the ameliorative and not protective effects of Bz on disease activity, considering the clinical use. Because older (14-week-old) MRL/lpr mice harbor high lpr T cells, which Bz selectively targets (as well as plasma cells), the lethal and toxic effects of Bz may be due to the killing of a large number of lymphocytes. After discontinuation of Bz treatment, the mice survival rate clearly improved, although the anti-dsDNA antibody level resurged. As reported previously by Khodadadi et al. [10], maintenance therapy might be required for a complete immunological remission after Bz treatment. One reason for the improved mice survival rates compared with the continuously Bz-treated mice could be just the removal of toxicity. Another reason might be the therapeutic effect after the acute toxic phase shown in Fig. 6 because the survival rate after discontinuation of Bz treatment from 18 weeks of age was higher than the survival rate in the control mice (the survival rates from 18 weeks of age until 43 weeks of age were 83% vs 50%, respectively). This indicated that Bz treatment, at least for a limited duration, might provide survival advantages despite the resurgence of anti-dsDNA antibody.
Bz and Cyc treatments resulted in a significant change in the expression levels of a number of genes in splenocytes (Additional file 1). No genes or canonical pathways were commonly shared between Bz and Cyc treatments (Additional files 1 and 2), suggesting that the molecular responses to these treatments were totally different. IPA revealed that DNA damage-related pathways (GADD45 and DNA damage-induced 14-3-3 signaling) were most significantly associated with Cyc treatment (Additional file 2). This suggested that Cyc treatment, which alkylates DNA, induces DNA damage and activates the cell cycle checkpoint. IPA also showed that the protein ubiquitin pathway was most significantly associated with Bz treatment. The protein ubiquitin pathway is the process for the degradation of unfolded proteins [41]. The amount of HSP family and proteasome subunit proteins was significantly increased with Bz treatment (Additional file 3). HSPs function as molecular chaperons and unfold misfolded intracellular proteins to decrease ER stress [42]. Bz treatment may also activate the counteracting system against ER stress as well as ER stress in lymphocytes.
Bz has been reported to have several side effects on therapeutic uses [43], some of which may be related to cytokine levels [44, 45]. In an LPS-induced shock mouse, which is considered to be a model of sepsis, serum cytokines such as IL-6 and TNF-α were increased, and these cytokines induced organ injury and mortality [4648]. In our study, cytoreduction by Bz may induce proinflammatory cytokine release at an early phase, and this inflammation could be lethal to some MRL/lpr mice at 14 weeks of age. At 18 weeks of age, serum IL-6 and TNF-α levels were rather decreased in surviving mice treated from both 10 and 14 weeks of age. High IL-6 and TNF-α levels may be associated with lethality in mice up to 18 weeks of age. It is also possible that Bz exerts anti-inflammatory effects by inhibiting NF-κB activation [49] after the clearance of the majority of Bz-targeting cells, such as plasma and lpr T cells. ER stress has been considered to trigger cell death via apoptosis [4, 50], without inducing inflammatory reactions. Programmed necrosis, “necroptosis,” which was originally reported as Fas-triggered and caspase-independent necrotic cell death, is mediated by receptor-interacting protein [51] and inhibited by Necrostatin [52]. In contrast to apoptosis, necroptosis or secondary necrosis is followed by innate immune inflammation via the release of damage-associated molecular patterns (DAMPs), such as HMBG1 and HSPs [5355]. In addition to their function as molecular chaperones with a cellular protective effect, HSPs also function as DAMPs and have proinflammatory potential in immunogenic cell death [5658], which might have lethal effects. As shown in Table 1 and Additional file 4, HSPA1A (HSP70) and HSPB1 (HSP27) were characteristically induced with Bz treatment both in vivo and in vitro. Because our study was limited to the use of data obtained from the whole spleen or lymph node cells, it still remains unknown which cell subsets are the source of such DAMPs. Bz treatment resulted in higher amounts, although not significant, of HSPA1A in lymph node cells at 14 weeks of age when compared with treatment at 10 weeks of age, as shown in Additional file 4. This might represent the higher frequency of Bz-sensitive lpr T cells in 14-week-old mice (Fig. 2b). Bz might cause immunogenic lymphocyte death associated with the induction of DAMPs, such as HSPs, followed by stimulation of the innate immune system and increased inflammatory cytokine release. Indeed, the IL-6 level was significantly increased (3.135-fold) in the splenocytes of Bz-treated mice but not of Cyc-treated mice (Additional file 2), which supports our idea.
MRL/lpr mice may have some lymphoproliferative disorder even at younger age. Because Bz induced massive cell death, the death of mice might be due to tumor lysis syndrome which is defined as a complication of metabolic abnormalities caused by the rapid release of intracellular components. Following massive tumor cell death, the diagnostic criteria include hyperuricemia, hypocalcemia, hyperphosphatemia, and renal failure [59]. After treatment with Bz, however, serum uric acid, calcium, and phosphate levels did not significantly change between Bz-untreated and Bz-treated MRL/lpr mice at 14 weeks of age (Additional file 5). We conclude that the main cause of the death of mice in this case is not tumor lysis syndrome but systemic inflammation. Although there are no defined counterparts for lpr T cells in SLE patients, plasmablasts, which are defined as CD19loCD27++ or CD27++CD38+ cells that can secrete immunoglobulin molecules, were reported to be increased in number in the peripheral blood of SLE patients [60, 61]. Alexander et al. [16] reported that Bz significantly reduced plasmablasts in the peripheral blood. Active SLE patients with increased Bz-sensitive plasmablasts are more likely to develop inflammation-associated complications than inactive SLE patients.
Because HSP70 [3436] and HSP27 [37] were reported to activate the innate immune system via Toll-like receptor 4 (TLR4), we designed dexamethasone (Dex) administration to Bz-treated mice expecting an inhibitory effect on lower survival. As reported in LPS model mice [62, 63], Dex would counteract with acute phase reactions induced by Bz; however, this failed to prevent the death of Bz-treated mice (Additional file 6). We assumed that Dex may have been ineffective in counteracting acute phase reactions due to its short biological half-life. In the experiment depicted in Additional file 6, Dex was injected only before Bz injection, twice a week (72-h or 96-h intervals). The half-life of Dex seemed to be just a few hours in rats [64, 65]. One possible reason for the high mortality rate despite Dex administration may be because the anti-inflammatory effect waned off during the intervals between doses. After cessation of the anti-inflammatory effect of Dex, DAMP release may restimulate the innate immune system and have some rebound effect on inflammation associated with steroid withdrawal. To control the acute systemic inflammation after Bz administration, we may need to consider more frequent administration of dexamethasone or a more specific strategy, such as anti-IL-6 receptor therapy [66].

Conclusions

In summary, Bz, which could target plasma cells to mediate its therapeutic effects in lupus-like disease, exerted lethal toxic effects in MRL/lpr mice with high disease activity. Systemic inflammatory reaction triggered by cell death from Bz treatment might be lethal to MRL/lpr mice. Clarification of the molecular mechanisms of the effects of Bz is needed prior to its application as a preventive strategy in human SLE. We propose that it is important to take the disease activity of these mice models into consideration when elucidating the therapeutic and toxic effects of this novel drug for SLE.

Acknowledgements

The authors thank the Biomedical Research Core and Pathology Platform of Tohoku University for technical support. They also thank Miss Chikako Fushimi for technical assistance. The authors appreciate Dr Masao Ono (National Hospital Organization Mito Medical Center) for technical support and helpful discussion.

Funding

This study was supported by Health and Labour Sciences Research Grants for the Research on New Drug and Medical Device Development toward Recovery of the Disaster-Stricken Area (H24-005).

Availability of data and materials

The microarray data were deposited in Gene Expression Omnibus [GEO:GSE94750].
This study was approved by the Institute for Animal Experimentation, Tohoku University Graduate School of Medicine (2016-Medicine Animal-128).
Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://​creativecommons.​org/​publicdomain/​zero/​1.​0/​) applies to the data made available in this article, unless otherwise stated.
Anhänge

Additional files

Literatur
2.
Zurück zum Zitat Hiepe F, Dorner T, Hauser AE, Hoyer BF, Mei H, Radbruch A. Long-lived autoreactive plasma cells drive persistent autoimmune inflammation. Nat Rev Rheumatol. 2011;7(3):170–8.CrossRefPubMed Hiepe F, Dorner T, Hauser AE, Hoyer BF, Mei H, Radbruch A. Long-lived autoreactive plasma cells drive persistent autoimmune inflammation. Nat Rev Rheumatol. 2011;7(3):170–8.CrossRefPubMed
3.
Zurück zum Zitat Narain S, Furie R. Update on clinical trials in systemic lupus erythematosus. Curr Opin Rheumatol. 2016;28(5):477–87.CrossRefPubMed Narain S, Furie R. Update on clinical trials in systemic lupus erythematosus. Curr Opin Rheumatol. 2016;28(5):477–87.CrossRefPubMed
4.
Zurück zum Zitat Ri M. Endoplasmic-reticulum stress pathway-associated mechanisms of action of proteasome inhibitors in multiple myeloma. Int J Hematol. 2016;104(3):273–80.CrossRefPubMed Ri M. Endoplasmic-reticulum stress pathway-associated mechanisms of action of proteasome inhibitors in multiple myeloma. Int J Hematol. 2016;104(3):273–80.CrossRefPubMed
5.
Zurück zum Zitat Meister S, Schubert U, Neubert K, Herrmann K, Burger R, Gramatzki M, Hahn S, Schreiber S, Wilhelm S, Herrmann M, et al. Extensive immunoglobulin production sensitizes myeloma cells for proteasome inhibition. Cancer Res. 2007;67(4):1783–92.CrossRefPubMed Meister S, Schubert U, Neubert K, Herrmann K, Burger R, Gramatzki M, Hahn S, Schreiber S, Wilhelm S, Herrmann M, et al. Extensive immunoglobulin production sensitizes myeloma cells for proteasome inhibition. Cancer Res. 2007;67(4):1783–92.CrossRefPubMed
6.
Zurück zum Zitat Chari A, Mazumder A, Jagannath S. Proteasome inhibition and its therapeutic potential in multiple myeloma. Biologics. 2010;4:273–87.PubMedPubMedCentral Chari A, Mazumder A, Jagannath S. Proteasome inhibition and its therapeutic potential in multiple myeloma. Biologics. 2010;4:273–87.PubMedPubMedCentral
7.
Zurück zum Zitat Neubert K, Meister S, Moser K, Weisel F, Maseda D, Amann K, Wiethe C, Winkler TH, Kalden JR, Manz RA, et al. The proteasome inhibitor bortezomib depletes plasma cells and protects mice with lupus-like disease from nephritis. Nat Med. 2008;14(7):748–55.CrossRefPubMed Neubert K, Meister S, Moser K, Weisel F, Maseda D, Amann K, Wiethe C, Winkler TH, Kalden JR, Manz RA, et al. The proteasome inhibitor bortezomib depletes plasma cells and protects mice with lupus-like disease from nephritis. Nat Med. 2008;14(7):748–55.CrossRefPubMed
8.
Zurück zum Zitat Lee SW, Kim BS. Comparison of therapeutic efficacy between bortezomib and combination treatment of prednisolone and mycophenolate mofetil on nephritis in NZB/WF1 mice. Clin Exp Rheumatol. 2010;28(3):393–6.PubMed Lee SW, Kim BS. Comparison of therapeutic efficacy between bortezomib and combination treatment of prednisolone and mycophenolate mofetil on nephritis in NZB/WF1 mice. Clin Exp Rheumatol. 2010;28(3):393–6.PubMed
9.
Zurück zum Zitat Hainz N, Thomas S, Neubert K, Meister S, Benz K, Rauh M, Daniel C, Wiesener M, Voll RE, Amann K. The proteasome inhibitor bortezomib prevents lupus nephritis in the NZB/W F1 mouse model by preservation of glomerular and tubulointerstitial architecture. Nephron Exp Nephrol. 2012;120(2):e47–58.CrossRefPubMed Hainz N, Thomas S, Neubert K, Meister S, Benz K, Rauh M, Daniel C, Wiesener M, Voll RE, Amann K. The proteasome inhibitor bortezomib prevents lupus nephritis in the NZB/W F1 mouse model by preservation of glomerular and tubulointerstitial architecture. Nephron Exp Nephrol. 2012;120(2):e47–58.CrossRefPubMed
10.
Zurück zum Zitat Khodadadi L, Cheng Q, Alexander T, Sercan-Alp O, Klotsche J, Radbruch A, Hiepe F, Hoyer BF, Taddeo A. Bortezomib plus continuous B cell depletion results in sustained plasma cell depletion and amelioration of lupus nephritis in NZB/W F1 mice. PLoS One. 2015;10(8):e0135081.CrossRefPubMedPubMedCentral Khodadadi L, Cheng Q, Alexander T, Sercan-Alp O, Klotsche J, Radbruch A, Hiepe F, Hoyer BF, Taddeo A. Bortezomib plus continuous B cell depletion results in sustained plasma cell depletion and amelioration of lupus nephritis in NZB/W F1 mice. PLoS One. 2015;10(8):e0135081.CrossRefPubMedPubMedCentral
11.
Zurück zum Zitat Taddeo A, Khodadadi L, Voigt C, Mumtaz IM, Cheng Q, Moser K, Alexander T, Manz RA, Radbruch A, Hiepe F, et al. Long-lived plasma cells are early and constantly generated in New Zealand Black/New Zealand White F1 mice and their therapeutic depletion requires a combined targeting of autoreactive plasma cells and their precursors. Arthritis Res Ther. 2015;17:39.CrossRefPubMedPubMedCentral Taddeo A, Khodadadi L, Voigt C, Mumtaz IM, Cheng Q, Moser K, Alexander T, Manz RA, Radbruch A, Hiepe F, et al. Long-lived plasma cells are early and constantly generated in New Zealand Black/New Zealand White F1 mice and their therapeutic depletion requires a combined targeting of autoreactive plasma cells and their precursors. Arthritis Res Ther. 2015;17:39.CrossRefPubMedPubMedCentral
12.
Zurück zum Zitat Matsuki-Muramoto Y, Nozawa K, Uomori K, Sekigawa I, Takasaki Y. Bortezomib treatment prevents glomerulosclerosis associated with lupus nephritis in a murine model through suppressive effects on the immune and renin-angiotensin systems. Mod Rheumatol. 2017;27(1):77–86. Matsuki-Muramoto Y, Nozawa K, Uomori K, Sekigawa I, Takasaki Y. Bortezomib treatment prevents glomerulosclerosis associated with lupus nephritis in a murine model through suppressive effects on the immune and renin-angiotensin systems. Mod Rheumatol. 2017;27(1):77–86.
13.
Zurück zum Zitat Seavey MM, Lu LD, Stump KL, Wallace NH, Ruggeri BA. Novel, orally active, proteasome inhibitor, delanzomib (CEP-18770), ameliorates disease symptoms and glomerulonephritis in two preclinical mouse models of SLE. Int Immunopharmacol. 2012;12(1):257–70.CrossRefPubMed Seavey MM, Lu LD, Stump KL, Wallace NH, Ruggeri BA. Novel, orally active, proteasome inhibitor, delanzomib (CEP-18770), ameliorates disease symptoms and glomerulonephritis in two preclinical mouse models of SLE. Int Immunopharmacol. 2012;12(1):257–70.CrossRefPubMed
14.
Zurück zum Zitat Nikolova-Ganeva KA, Gesheva VV, Todorov TA, Voll RE, Vassilev TL. Targeted silencing of DNA-specific B cells combined with partial plasma cell depletion displays additive effects on delaying disease onset in lupus-prone mice. Clin Exp Immunol. 2013;174(2):221–8.PubMedPubMedCentral Nikolova-Ganeva KA, Gesheva VV, Todorov TA, Voll RE, Vassilev TL. Targeted silencing of DNA-specific B cells combined with partial plasma cell depletion displays additive effects on delaying disease onset in lupus-prone mice. Clin Exp Immunol. 2013;174(2):221–8.PubMedPubMedCentral
15.
Zurück zum Zitat Frohlich K, Holle JU, Aries PM, Gross WL, Moosig F. Successful use of bortezomib in a patient with systemic lupus erythematosus and multiple myeloma. Ann Rheum Dis. 2011;70(7):1344–5.CrossRefPubMed Frohlich K, Holle JU, Aries PM, Gross WL, Moosig F. Successful use of bortezomib in a patient with systemic lupus erythematosus and multiple myeloma. Ann Rheum Dis. 2011;70(7):1344–5.CrossRefPubMed
16.
Zurück zum Zitat Alexander T, Sarfert R, Klotsche J, Kuhl AA, Rubbert-Roth A, Lorenz HM, Rech J, Hoyer BF, Cheng Q, Waka A, et al. The proteasome inhibitior bortezomib depletes plasma cells and ameliorates clinical manifestations of refractory systemic lupus erythematosus. Ann Rheum Dis. 2015;74(7):1474–8.CrossRefPubMedPubMedCentral Alexander T, Sarfert R, Klotsche J, Kuhl AA, Rubbert-Roth A, Lorenz HM, Rech J, Hoyer BF, Cheng Q, Waka A, et al. The proteasome inhibitior bortezomib depletes plasma cells and ameliorates clinical manifestations of refractory systemic lupus erythematosus. Ann Rheum Dis. 2015;74(7):1474–8.CrossRefPubMedPubMedCentral
17.
Zurück zum Zitat Ishii T, Tanaka Y, Kawakami A, Saito K, Ichinose K, Shirota Y, Fujii H, Fujita Y, Kamogawa Y, Machiyama T, Akita K, Harigae H. The first randomized control trial to evaluate the effectiveness of bortezomib for refractory systemic lupus erythematosus [abstract 1812]. Arthritis Rheumatol. 2015;67 Suppl 10. Ishii T, Tanaka Y, Kawakami A, Saito K, Ichinose K, Shirota Y, Fujii H, Fujita Y, Kamogawa Y, Machiyama T, Akita K, Harigae H. The first randomized control trial to evaluate the effectiveness of bortezomib for refractory systemic lupus erythematosus [abstract 1812]. Arthritis Rheumatol. 2015;67 Suppl 10.
18.
Zurück zum Zitat Cohen PL, Eisenberg RA. Lpr and gld: single gene models of systemic autoimmunity and lymphoproliferative disease. Annu Rev Immunol. 1991;9:243–69.CrossRefPubMed Cohen PL, Eisenberg RA. Lpr and gld: single gene models of systemic autoimmunity and lymphoproliferative disease. Annu Rev Immunol. 1991;9:243–69.CrossRefPubMed
19.
Zurück zum Zitat Andrews BS, Eisenberg RA, Theofilopoulos AN, Izui S, Wilson CB, McConahey PJ, Murphy ED, Roths JB, Dixon FJ. Spontaneous murine lupus-like syndromes. Clinical and immunopathological manifestations in several strains. J Exp Med. 1978;148(5):1198–215.CrossRefPubMed Andrews BS, Eisenberg RA, Theofilopoulos AN, Izui S, Wilson CB, McConahey PJ, Murphy ED, Roths JB, Dixon FJ. Spontaneous murine lupus-like syndromes. Clinical and immunopathological manifestations in several strains. J Exp Med. 1978;148(5):1198–215.CrossRefPubMed
20.
Zurück zum Zitat Shibata T, Berney T, Spertini F, Izui S. Rheumatoid factors in mice bearing the lpr or gld mutation. Selective production of rheumatoid factor cryoglobulins in MRL/MPJ-lpr/lpr mice. Clin Exp Immunol. 1992;87(2):190–5.CrossRefPubMedPubMedCentral Shibata T, Berney T, Spertini F, Izui S. Rheumatoid factors in mice bearing the lpr or gld mutation. Selective production of rheumatoid factor cryoglobulins in MRL/MPJ-lpr/lpr mice. Clin Exp Immunol. 1992;87(2):190–5.CrossRefPubMedPubMedCentral
21.
Zurück zum Zitat Takahashi S, Nose M, Sasaki J, Yamamoto T, Kyogoku M. IgG3 production in MRL/lpr mice is responsible for development of lupus nephritis. J Immunol. 1991;147(2):515–9.PubMed Takahashi S, Nose M, Sasaki J, Yamamoto T, Kyogoku M. IgG3 production in MRL/lpr mice is responsible for development of lupus nephritis. J Immunol. 1991;147(2):515–9.PubMed
22.
Zurück zum Zitat Takahashi S, Fossati L, Iwamoto M, Merino R, Motta R, Kobayakawa T, Izui S. Imbalance towards Th1 predominance is associated with acceleration of lupus-like autoimmune syndrome in MRL mice. J Clin Invest. 1996;97(7):1597–604.CrossRefPubMedPubMedCentral Takahashi S, Fossati L, Iwamoto M, Merino R, Motta R, Kobayakawa T, Izui S. Imbalance towards Th1 predominance is associated with acceleration of lupus-like autoimmune syndrome in MRL mice. J Clin Invest. 1996;97(7):1597–604.CrossRefPubMedPubMedCentral
24.
Zurück zum Zitat Itoh J, Nose M, Takahashi S, Ono M, Terasaki S, Kondoh E, Kyogoku M. Induction of different types of glomerulonephritis by monoclonal antibodies derived from an MRL/lpr lupus mouse. Am J Pathol. 1993;143(5):1436–43.PubMedPubMedCentral Itoh J, Nose M, Takahashi S, Ono M, Terasaki S, Kondoh E, Kyogoku M. Induction of different types of glomerulonephritis by monoclonal antibodies derived from an MRL/lpr lupus mouse. Am J Pathol. 1993;143(5):1436–43.PubMedPubMedCentral
25.
Zurück zum Zitat Ito MR, Terasaki S, Kondo E, Shiwaku H, Fukuoka Y, Nose M. Experimental lupus nephritis in severe combined immunodeficient (SCID) mice: remodelling of the glomerular lesions by bystander IgM antibodies. Clin Exp Immunol. 2000;119(2):340–5.CrossRefPubMedPubMedCentral Ito MR, Terasaki S, Kondo E, Shiwaku H, Fukuoka Y, Nose M. Experimental lupus nephritis in severe combined immunodeficient (SCID) mice: remodelling of the glomerular lesions by bystander IgM antibodies. Clin Exp Immunol. 2000;119(2):340–5.CrossRefPubMedPubMedCentral
26.
Zurück zum Zitat Fujii H, Nakatani K, Arita N, Ito MR, Terada M, Miyazaki T, Yoshida M, Ono M, Fujiwara T, Saiga K, et al. Internalization of antibodies by endothelial cells via fibronectin implicating a novel mechanism in lupus nephritis. Kidney Int. 2003;64(5):1662–70.CrossRefPubMed Fujii H, Nakatani K, Arita N, Ito MR, Terada M, Miyazaki T, Yoshida M, Ono M, Fujiwara T, Saiga K, et al. Internalization of antibodies by endothelial cells via fibronectin implicating a novel mechanism in lupus nephritis. Kidney Int. 2003;64(5):1662–70.CrossRefPubMed
27.
Zurück zum Zitat Nakatani K, Fujii H, Hasegawa H, Terada M, Arita N, Ito MR, Ono M, Takahashi S, Saiga K, Yoshimoto S, et al. Endothelial adhesion molecules in glomerular lesions: association with their severity and diversity in lupus models. Kidney Int. 2004;65(4):1290–300.CrossRefPubMed Nakatani K, Fujii H, Hasegawa H, Terada M, Arita N, Ito MR, Ono M, Takahashi S, Saiga K, Yoshimoto S, et al. Endothelial adhesion molecules in glomerular lesions: association with their severity and diversity in lupus models. Kidney Int. 2004;65(4):1290–300.CrossRefPubMed
28.
Zurück zum Zitat Takabayashi K, Koike T, Kurasawa K, Matsumura R, Sato T, Tomioka H, Ito I, Yoshiki T, Yoshida S. Effect of FK-506, a novel immunosuppressive drug on murine systemic lupus erythematosus. Clin Immunol Immunopathol. 1989;51(1):110–7.CrossRefPubMed Takabayashi K, Koike T, Kurasawa K, Matsumura R, Sato T, Tomioka H, Ito I, Yoshiki T, Yoshida S. Effect of FK-506, a novel immunosuppressive drug on murine systemic lupus erythematosus. Clin Immunol Immunopathol. 1989;51(1):110–7.CrossRefPubMed
29.
Zurück zum Zitat Van Bruggen MC, Walgreen B, Rijke TP, Berden JH. Attenuation of murine lupus nephritis by mycophenolate mofetil. J Am Soc Nephrol. 1998;9(8):1407–15.PubMed Van Bruggen MC, Walgreen B, Rijke TP, Berden JH. Attenuation of murine lupus nephritis by mycophenolate mofetil. J Am Soc Nephrol. 1998;9(8):1407–15.PubMed
30.
Zurück zum Zitat Bobe P, Bonardelle D, Benihoud K, Opolon P, Chelbi-Alix MK. Arsenic trioxide: a promising novel therapeutic agent for lymphoproliferative and autoimmune syndromes in MRL/lpr mice. Blood. 2006;108(13):3967–75.CrossRefPubMed Bobe P, Bonardelle D, Benihoud K, Opolon P, Chelbi-Alix MK. Arsenic trioxide: a promising novel therapeutic agent for lymphoproliferative and autoimmune syndromes in MRL/lpr mice. Blood. 2006;108(13):3967–75.CrossRefPubMed
31.
Zurück zum Zitat Yan Q, Du F, Huang X, Fu Q, Chen S, Dai D, Bao C. Prevention of immune nephritis by the small molecular weight immunomodulator iguratimod in MRL/lpr mice. PLoS One. 2014;9(10):e108273.CrossRefPubMedPubMedCentral Yan Q, Du F, Huang X, Fu Q, Chen S, Dai D, Bao C. Prevention of immune nephritis by the small molecular weight immunomodulator iguratimod in MRL/lpr mice. PLoS One. 2014;9(10):e108273.CrossRefPubMedPubMedCentral
32.
Zurück zum Zitat Furumoto Y, Smith CK, Blanco L, Zhao W, Brooks SR, Thacker SG, Zarzour A, Sciume G, Tsai WL, Trier AM, et al. Tofacitinib ameliorates murine lupus and its associated vascular dysfunction. Arthritis Rheumatol. 2017;69(1):148–60.CrossRefPubMedPubMedCentral Furumoto Y, Smith CK, Blanco L, Zhao W, Brooks SR, Thacker SG, Zarzour A, Sciume G, Tsai WL, Trier AM, et al. Tofacitinib ameliorates murine lupus and its associated vascular dysfunction. Arthritis Rheumatol. 2017;69(1):148–60.CrossRefPubMedPubMedCentral
33.
Zurück zum Zitat Miyazaki T, Ono M, Qu WM, Zhang MC, Mori S, Nakatsuru S, Nakamura Y, Sawasaki T, Endo Y, Nose M. Implication of allelic polymorphism of osteopontin in the development of lupus nephritis in MRL/lpr mice. Eur J Immunol. 2005;35(5):1510–20.CrossRefPubMed Miyazaki T, Ono M, Qu WM, Zhang MC, Mori S, Nakatsuru S, Nakamura Y, Sawasaki T, Endo Y, Nose M. Implication of allelic polymorphism of osteopontin in the development of lupus nephritis in MRL/lpr mice. Eur J Immunol. 2005;35(5):1510–20.CrossRefPubMed
34.
Zurück zum Zitat Vabulas RM, Ahmad-Nejad P, Ghose S, Kirschning CJ, Issels RD, Wagner H. HSP70 as endogenous stimulus of the Toll/interleukin-1 receptor signal pathway. J Biol Chem. 2002;277(17):15107–12.CrossRefPubMed Vabulas RM, Ahmad-Nejad P, Ghose S, Kirschning CJ, Issels RD, Wagner H. HSP70 as endogenous stimulus of the Toll/interleukin-1 receptor signal pathway. J Biol Chem. 2002;277(17):15107–12.CrossRefPubMed
35.
Zurück zum Zitat Dybdahl B, Wahba A, Lien E, Flo TH, Waage A, Qureshi N, Sellevold OF, Espevik T, Sundan A. Inflammatory response after open heart surgery: release of heat-shock protein 70 and signaling through toll-like receptor-4. Circulation. 2002;105(6):685–90.CrossRefPubMed Dybdahl B, Wahba A, Lien E, Flo TH, Waage A, Qureshi N, Sellevold OF, Espevik T, Sundan A. Inflammatory response after open heart surgery: release of heat-shock protein 70 and signaling through toll-like receptor-4. Circulation. 2002;105(6):685–90.CrossRefPubMed
36.
Zurück zum Zitat Chen T, Guo J, Han C, Yang M, Cao X. Heat shock protein 70, released from heat-stressed tumor cells, initiates antitumor immunity by inducing tumor cell chemokine production and activating dendritic cells via TLR4 pathway. J Immunol. 2009;182(3):1449–59.CrossRefPubMed Chen T, Guo J, Han C, Yang M, Cao X. Heat shock protein 70, released from heat-stressed tumor cells, initiates antitumor immunity by inducing tumor cell chemokine production and activating dendritic cells via TLR4 pathway. J Immunol. 2009;182(3):1449–59.CrossRefPubMed
37.
Zurück zum Zitat Yusuf N, Nasti TH, Huang CM, Huber BS, Jaleel T, Lin HY, Xu H, Elmets CA. Heat shock proteins HSP27 and HSP70 are present in the skin and are important mediators of allergic contact hypersensitivity. J Immunol. 2009;182(1):675–83.CrossRefPubMedPubMedCentral Yusuf N, Nasti TH, Huang CM, Huber BS, Jaleel T, Lin HY, Xu H, Elmets CA. Heat shock proteins HSP27 and HSP70 are present in the skin and are important mediators of allergic contact hypersensitivity. J Immunol. 2009;182(1):675–83.CrossRefPubMedPubMedCentral
38.
Zurück zum Zitat Morse 3rd HC, Davidson WF, Yetter RA, Murphy ED, Roths JB, Coffman RL. Abnormalities induced by the mutant gene Ipr: expansion of a unique lymphocyte subset. J Immunol. 1982;129(6):2612–5.PubMed Morse 3rd HC, Davidson WF, Yetter RA, Murphy ED, Roths JB, Coffman RL. Abnormalities induced by the mutant gene Ipr: expansion of a unique lymphocyte subset. J Immunol. 1982;129(6):2612–5.PubMed
39.
Zurück zum Zitat Martina MN, Noel S, Saxena A, Rabb H, Hamad AR. Double negative (DN) alphabeta T cells: misperception and overdue recognition. Immunol Cell Biol. 2015;93(3):305–10.CrossRefPubMed Martina MN, Noel S, Saxena A, Rabb H, Hamad AR. Double negative (DN) alphabeta T cells: misperception and overdue recognition. Immunol Cell Biol. 2015;93(3):305–10.CrossRefPubMed
41.
Zurück zum Zitat Glickman MH, Ciechanover A. The ubiquitin-proteasome proteolytic pathway: destruction for the sake of construction. Physiol Rev. 2002;82(2):373–428.CrossRefPubMed Glickman MH, Ciechanover A. The ubiquitin-proteasome proteolytic pathway: destruction for the sake of construction. Physiol Rev. 2002;82(2):373–428.CrossRefPubMed
42.
Zurück zum Zitat Finka A, Mattoo RU, Goloubinoff P. Experimental milestones in the discovery of molecular chaperones as polypeptide unfolding enzymes. Annu Rev Biochem. 2016;85:715–42.CrossRefPubMed Finka A, Mattoo RU, Goloubinoff P. Experimental milestones in the discovery of molecular chaperones as polypeptide unfolding enzymes. Annu Rev Biochem. 2016;85:715–42.CrossRefPubMed
43.
Zurück zum Zitat Scott K, Hayden PJ, Will A, Wheatley K, Coyne I. Bortezomib for the treatment of multiple myeloma. Cochrane Database Syst Rev. 2016;4:CD010816.PubMed Scott K, Hayden PJ, Will A, Wheatley K, Coyne I. Bortezomib for the treatment of multiple myeloma. Cochrane Database Syst Rev. 2016;4:CD010816.PubMed
44.
Zurück zum Zitat Min CK, Lee S, Kim YJ, Eom KS, Lee JW, Min WS, Kim CC, Cho CS, Park G. Cutaneous leucoclastic vasculitis (LV) following bortezomib therapy in a myeloma patient; association with pro-inflammatory cytokines. Eur J Haematol. 2006;76(3):265–8.CrossRefPubMed Min CK, Lee S, Kim YJ, Eom KS, Lee JW, Min WS, Kim CC, Cho CS, Park G. Cutaneous leucoclastic vasculitis (LV) following bortezomib therapy in a myeloma patient; association with pro-inflammatory cytokines. Eur J Haematol. 2006;76(3):265–8.CrossRefPubMed
45.
Zurück zum Zitat Maruyama D, Watanabe T, Heike Y, Nagase K, Takahashi N, Yamasaki S, Waki F, Yokoyama H, Kim SW, Kobayashi Y, et al. Stromal cells in bone marrow play important roles in pro-inflammatory cytokine secretion causing fever following bortezomib administration in patients with multiple myeloma. Int J Hematol. 2008;88(4):396–402.CrossRefPubMed Maruyama D, Watanabe T, Heike Y, Nagase K, Takahashi N, Yamasaki S, Waki F, Yokoyama H, Kim SW, Kobayashi Y, et al. Stromal cells in bone marrow play important roles in pro-inflammatory cytokine secretion causing fever following bortezomib administration in patients with multiple myeloma. Int J Hematol. 2008;88(4):396–402.CrossRefPubMed
46.
Zurück zum Zitat Karima R, Matsumoto S, Higashi H, Matsushima K. The molecular pathogenesis of endotoxic shock and organ failure. Mol Med Today. 1999;5(3):123–32.CrossRefPubMed Karima R, Matsumoto S, Higashi H, Matsushima K. The molecular pathogenesis of endotoxic shock and organ failure. Mol Med Today. 1999;5(3):123–32.CrossRefPubMed
47.
Zurück zum Zitat Ulloa L, Tracey KJ. The “cytokine profile”: a code for sepsis. Trends Mol Med. 2005;11(2):56–63.CrossRefPubMed Ulloa L, Tracey KJ. The “cytokine profile”: a code for sepsis. Trends Mol Med. 2005;11(2):56–63.CrossRefPubMed
48.
Zurück zum Zitat Kruttgen A, Rose-John S. Interleukin-6 in sepsis and capillary leakage syndrome. J Interferon Cytokine Res. 2012;32(2):60–5.CrossRefPubMed Kruttgen A, Rose-John S. Interleukin-6 in sepsis and capillary leakage syndrome. J Interferon Cytokine Res. 2012;32(2):60–5.CrossRefPubMed
50.
Zurück zum Zitat Hetz C. The unfolded protein response: controlling cell fate decisions under ER stress and beyond. Nat Rev Mol Cell Biol. 2012;13(2):89–102.PubMed Hetz C. The unfolded protein response: controlling cell fate decisions under ER stress and beyond. Nat Rev Mol Cell Biol. 2012;13(2):89–102.PubMed
51.
Zurück zum Zitat Holler N, Zaru R, Micheau O, Thome M, Attinger A, Valitutti S, Bodmer JL, Schneider P, Seed B, Tschopp J. Fas triggers an alternative, caspase-8-independent cell death pathway using the kinase RIP as effector molecule. Nat Immunol. 2000;1(6):489–95.CrossRefPubMed Holler N, Zaru R, Micheau O, Thome M, Attinger A, Valitutti S, Bodmer JL, Schneider P, Seed B, Tschopp J. Fas triggers an alternative, caspase-8-independent cell death pathway using the kinase RIP as effector molecule. Nat Immunol. 2000;1(6):489–95.CrossRefPubMed
52.
Zurück zum Zitat Degterev A, Huang Z, Boyce M, Li Y, Jagtap P, Mizushima N, Cuny GD, Mitchison TJ, Moskowitz MA, Yuan J. Chemical inhibitor of nonapoptotic cell death with therapeutic potential for ischemic brain injury. Nat Chem Biol. 2005;1(2):112–9.CrossRefPubMed Degterev A, Huang Z, Boyce M, Li Y, Jagtap P, Mizushima N, Cuny GD, Mitchison TJ, Moskowitz MA, Yuan J. Chemical inhibitor of nonapoptotic cell death with therapeutic potential for ischemic brain injury. Nat Chem Biol. 2005;1(2):112–9.CrossRefPubMed
54.
Zurück zum Zitat Kaczmarek A, Vandenabeele P, Krysko DV. Necroptosis: the release of damage-associated molecular patterns and its physiological relevance. Immunity. 2013;38(2):209–23.CrossRefPubMed Kaczmarek A, Vandenabeele P, Krysko DV. Necroptosis: the release of damage-associated molecular patterns and its physiological relevance. Immunity. 2013;38(2):209–23.CrossRefPubMed
55.
56.
Zurück zum Zitat Korbelik M, Sun J, Cecic I. Photodynamic therapy-induced cell surface expression and release of heat shock proteins: relevance for tumor response. Cancer Res. 2005;65(3):1018–26.PubMed Korbelik M, Sun J, Cecic I. Photodynamic therapy-induced cell surface expression and release of heat shock proteins: relevance for tumor response. Cancer Res. 2005;65(3):1018–26.PubMed
57.
Zurück zum Zitat Garg AD, Krysko DV, Vandenabeele P, Agostinis P. Hypericin-based photodynamic therapy induces surface exposure of damage-associated molecular patterns like HSP70 and calreticulin. Cancer Immunol Immunother. 2012;61(2):215–21.CrossRefPubMed Garg AD, Krysko DV, Vandenabeele P, Agostinis P. Hypericin-based photodynamic therapy induces surface exposure of damage-associated molecular patterns like HSP70 and calreticulin. Cancer Immunol Immunother. 2012;61(2):215–21.CrossRefPubMed
58.
Zurück zum Zitat Galluzzi L, Buque A, Kepp O, Zitvogel L, Kroemer G. Immunogenic cell death in cancer and infectious disease. Nat Rev Immunol. 2017;17(2):97–111.CrossRefPubMed Galluzzi L, Buque A, Kepp O, Zitvogel L, Kroemer G. Immunogenic cell death in cancer and infectious disease. Nat Rev Immunol. 2017;17(2):97–111.CrossRefPubMed
59.
Zurück zum Zitat Cairo MS, Bishop M. Tumour lysis syndrome: new therapeutic strategies and classification. Br J Haematol. 2004;127(1):3–11.CrossRefPubMed Cairo MS, Bishop M. Tumour lysis syndrome: new therapeutic strategies and classification. Br J Haematol. 2004;127(1):3–11.CrossRefPubMed
60.
Zurück zum Zitat Odendahl M, Jacobi A, Hansen A, Feist E, Hiepe F, Burmester GR, Lipsky PE, Radbruch A, Dorner T. Disturbed peripheral B lymphocyte homeostasis in systemic lupus erythematosus. J Immunol. 2000;165(10):5970–9.CrossRefPubMed Odendahl M, Jacobi A, Hansen A, Feist E, Hiepe F, Burmester GR, Lipsky PE, Radbruch A, Dorner T. Disturbed peripheral B lymphocyte homeostasis in systemic lupus erythematosus. J Immunol. 2000;165(10):5970–9.CrossRefPubMed
61.
Zurück zum Zitat Jacobi AM, Odendahl M, Reiter K, Bruns A, Burmester GR, Radbruch A, Valet G, Lipsky PE, Dorner T. Correlation between circulating CD27high plasma cells and disease activity in patients with systemic lupus erythematosus. Arthritis Rheum. 2003;48(5):1332–42.CrossRefPubMed Jacobi AM, Odendahl M, Reiter K, Bruns A, Burmester GR, Radbruch A, Valet G, Lipsky PE, Dorner T. Correlation between circulating CD27high plasma cells and disease activity in patients with systemic lupus erythematosus. Arthritis Rheum. 2003;48(5):1332–42.CrossRefPubMed
62.
Zurück zum Zitat Weichhart T, Brandt O, Lassnig C, Muller M, Horl WH, Stingl G, Saemann MD. The anti-inflammatory potency of dexamethasone is determined by the route of application in vivo. Immunol Lett. 2010;129(1):50–2.CrossRefPubMed Weichhart T, Brandt O, Lassnig C, Muller M, Horl WH, Stingl G, Saemann MD. The anti-inflammatory potency of dexamethasone is determined by the route of application in vivo. Immunol Lett. 2010;129(1):50–2.CrossRefPubMed
63.
Zurück zum Zitat Wang ZH, Liang YB, Tang H, Chen ZB, Li ZY, Hu XC, Ma ZF. Dexamethasone down-regulates the expression of microRNA-155 in the livers of septic mice. PLoS One. 2013;8(11):e80547.CrossRefPubMedPubMedCentral Wang ZH, Liang YB, Tang H, Chen ZB, Li ZY, Hu XC, Ma ZF. Dexamethasone down-regulates the expression of microRNA-155 in the livers of septic mice. PLoS One. 2013;8(11):e80547.CrossRefPubMedPubMedCentral
64.
Zurück zum Zitat Samtani MN, Jusko WJ. Comparison of dexamethasone pharmacokinetics in female rats after intravenous and intramuscular administration. Biopharm Drug Dispos. 2005;26(3):85–91.CrossRefPubMedPubMedCentral Samtani MN, Jusko WJ. Comparison of dexamethasone pharmacokinetics in female rats after intravenous and intramuscular administration. Biopharm Drug Dispos. 2005;26(3):85–91.CrossRefPubMedPubMedCentral
65.
Zurück zum Zitat Earp JC, Pyszczynski NA, Molano DS, Jusko WJ. Pharmacokinetics of dexamethasone in a rat model of rheumatoid arthritis. Biopharm Drug Dispos. 2008;29(6):366–72.CrossRefPubMedPubMedCentral Earp JC, Pyszczynski NA, Molano DS, Jusko WJ. Pharmacokinetics of dexamethasone in a rat model of rheumatoid arthritis. Biopharm Drug Dispos. 2008;29(6):366–72.CrossRefPubMedPubMedCentral
66.
Zurück zum Zitat Tanaka T, Narazaki M, Kishimoto T. Immunotherapeutic implications of IL-6 blockade for cytokine storm. Immunotherapy. 2016;8(8):959–70.CrossRefPubMed Tanaka T, Narazaki M, Kishimoto T. Immunotherapeutic implications of IL-6 blockade for cytokine storm. Immunotherapy. 2016;8(8):959–70.CrossRefPubMed
Metadaten
Titel
Bortezomib treatment induces a higher mortality rate in lupus model mice with a higher disease activity
Publikationsdatum
01.12.2017
Erschienen in
Arthritis Research & Therapy / Ausgabe 1/2017
Elektronische ISSN: 1478-6362
DOI
https://doi.org/10.1186/s13075-017-1397-7

Weitere Artikel der Ausgabe 1/2017

Arthritis Research & Therapy 1/2017 Zur Ausgabe

Leitlinien kompakt für die Innere Medizin

Mit medbee Pocketcards sicher entscheiden.

Seit 2022 gehört die medbee GmbH zum Springer Medizin Verlag

Notfall-TEP der Hüfte ist auch bei 90-Jährigen machbar

26.04.2024 Hüft-TEP Nachrichten

Ob bei einer Notfalloperation nach Schenkelhalsfraktur eine Hemiarthroplastik oder eine totale Endoprothese (TEP) eingebaut wird, sollte nicht allein vom Alter der Patientinnen und Patienten abhängen. Auch über 90-Jährige können von der TEP profitieren.

Niedriger diastolischer Blutdruck erhöht Risiko für schwere kardiovaskuläre Komplikationen

25.04.2024 Hypotonie Nachrichten

Wenn unter einer medikamentösen Hochdrucktherapie der diastolische Blutdruck in den Keller geht, steigt das Risiko für schwere kardiovaskuläre Ereignisse: Darauf deutet eine Sekundäranalyse der SPRINT-Studie hin.

Bei schweren Reaktionen auf Insektenstiche empfiehlt sich eine spezifische Immuntherapie

Insektenstiche sind bei Erwachsenen die häufigsten Auslöser einer Anaphylaxie. Einen wirksamen Schutz vor schweren anaphylaktischen Reaktionen bietet die allergenspezifische Immuntherapie. Jedoch kommt sie noch viel zu selten zum Einsatz.

Therapiestart mit Blutdrucksenkern erhöht Frakturrisiko

25.04.2024 Hypertonie Nachrichten

Beginnen ältere Männer im Pflegeheim eine Antihypertensiva-Therapie, dann ist die Frakturrate in den folgenden 30 Tagen mehr als verdoppelt. Besonders häufig stürzen Demenzkranke und Männer, die erstmals Blutdrucksenker nehmen. Dafür spricht eine Analyse unter US-Veteranen.

Update Innere Medizin

Bestellen Sie unseren Fach-Newsletter und bleiben Sie gut informiert.