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Open Access 09.06.2020 | Original Article

Measuring the cellular memory B cell response after vaccination in patients after allogeneic stem cell transplantation

verfasst von: Julia Winkler, Hannes Tittlbach, Andrea Schneider, Corinna Buchstaller, Andreas Mayr, Ingrid Vasova, Wolf Roesler, Michael Mach, Andreas Mackensen, Thomas H. Winkler

Erschienen in: Annals of Hematology | Ausgabe 8/2020

Abstract

After allogeneic hematopoietic stem cell transplantation (HSCT), patients are repetitively vaccinated to reduce the risk of infection caused by the immune deficiency following allogeneic HSCT. By the vaccination of transplanted patients, the humoral memory function can be restored in the majority of cases. It is unknown, however, to what extent memory B cells derived from the donor contribute to the mobilization of antibody-secreting cells and long-term humoral memory in patients after allogeneic HSCT. We therefore analyzed patients after allogeneic HSCT for memory B cell responses 7 days after single vaccination against tetanus toxoid (TT), diphtheria toxoid (DT), pertussis toxoid (PT), Haemophilus influenzae type b (Hib), and poliovirus. Patients showed an insufficient mobilization of plasmablasts (PB) after vaccination, whereas healthy subjects (HD, n = 13) exhibited a significant increase of PB in the peripheral blood. Regarding vaccine-specific antibody-secreting PB, all HD responded against all vaccine antigens, as expected. However, only 65% of the patients responded with a measurable increase in IgG-secreting PB against TT, 65% against DT, 33% against PT, and 53% against poliovirus. Correspondingly, the antibody titers on day 7 after vaccination did not increase in patients. A significant increase of serum titers for the vaccine antigens was detectable in the majority of patients only after repetitive vaccinations. In contrast to the low mobilization of vaccine-specific PB after vaccination, a high number of PB before vaccination was detectable in patients following allogeneic HSCT. High frequencies of circulating PB correlated with the incidence of moderate/severe chronic GVHD. In summary, patients showed a weak mobilization of antigen-specific PB and an inadequate increase in antibody titers 7 days after the first vaccination. Patients with moderate or severe chronic GVHD in their history had a significantly higher percentage of IgG-secreting PB prior to vaccination. The antigen specificity of these IgG-secreting PB is currently unknown.

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Introduction

One of the major goals after allogeneic hematopoietic stem cell transplantation (HSCT) is to reconstitute the donor immune system in the patient. Immune reconstitution is defined as the restauration of the donor-derived pathogen-specific immunity. After HSCT, a long-lasting B cell deficiency is detectable, even when donor B cells are engrafted [1, 2]. The delayed B cell reconstitution leads to a persistent hypogammaglobulinemia and an increased rate of infections [3, 4]. This is mainly due to infections with viruses and encapsulated bacteria [5‐8]. The rapid decline of antibody titers against vaccine-preventable diseases (e.g., tetanus, polio, measles, mumps, rubella) is a manifestation of this B cell deficiency following allogeneic HSCT when the recipient is not revaccinated [9‐11].

It is known that reconstitution of B lymphocytes including memory B cells after allogeneic HSCT takes up to 2 years with transitional and naïve B cells dominating during the first year [12‐15]. The cause for the long-lasting reduction of memory B cells, despite sufficient numbers of transitional and naïve B cells, is unknown and has been described as an IgM maturation block [16]. Eventually, the paucity of CD27⁺ memory B cells can lead to an inability to produce a proper B cell response to pathogens [17, 18]. The memory B cell response against vaccine antigens shows a very specific and fast mobilization of antigen-specific antibody-secreting cells (ASC) into the peripheral blood within 6 to 7 days [19]. ASCs are CD19⁺/CD27^high/CD20⁻/CD38^high-positive B cells corresponding to recently generated plasmablasts. These ASCs provide a short-lived peak antibody response and then either die or compete successfully for survival in bone marrow niches or in an inflamed tissue to provide long-lived humoral immunity [20].

As the B memory response to vaccine immunizations in patients after allogeneic HSCT is unknown, we intended to analyze the generation of antibody-secreting B cells and CD38^high/CD27^high plasmablasts within 7 days after a single vaccination as an indicator of the status of the memory B cell compartment in patients after allogeneic HSCT.

Methods

Patients, healthy donors, and vaccination

Patient characteristics are summarized in Table 1. Between 2011 and 2016, 27 patients after d+180 of allogeneic HSCT were enrolled in the study approved by the institutional research ethics committee of the university Erlangen (Re. No. 147-12B). All patients provided informed consent.

Table 1

Patient characteristics and immunological parameters

Variables	No (%)
Number of patients	27
Age (years), median (range)	58 (18–74)
Gender
Male/Female	20 (74)/7 (26)
Primary disease
AML	18 (67)
MDS	6 (22)
Other (CML, MM, T-PLL)	3 (11)
Age of donors (years), median (range)	39 (19–60)
Donor type
HLA-matched sibling	9 (33)
HLA-matched unrelated	18 (67)
Conditioning regimen
FBM with CSA/MMF	20 (74)
Others with CSA/MTX (TBI/Cy, FLAMSA-RIC, Treo/Flu, Bu/Flu)	7 (26)
Rabbit ATG
2.5 mg/kg b.w.	9 (33)
7.5 mg /kg b.w.	18 (67)
Day of vaccination after alloSCT, median (range)	226 (180–430)
Cellular and humoral parameters on the date of first vaccination
CD3⁺ cells/μl, mean (range)	1103 (60–3006)
CD4⁺ cells/μl, mean (range)	241 (40–679)
CD19⁺ cells/μl, mean (range)	188 (16–758)
Plasmablasts/μl, mean (range)	8 (0–51)
Percentage of memory B cells of CD19+ cells/μl, mean (range)	11 (1–73)
Total IgG in g/l, mean (range)	7 (3–15)
Maximum grade of acute GVHD
No/grade I	8 (31)
Grades II–IV	19 (69)
Maximum grade of chronic GVHD
No/mild	17 (63)
Moderate/severe	10 (37)
Immunosuppressive therapy on the date of first vaccination
Yes*	19 (69)
No	8 (31)

*Steroid therapy < 0.2 mg/kg and/or cyclosporine A (plasma level ≤ 50 ng/ml)

At the start of the vaccination, acute GVHD was resolved in all patients, and all patients with a chronic GVHD in their history had an inactive chronic GVHD and only a minimum dose of the immunosuppressive therapy (e.g., steroids, cyclosporine A). For treatment of chronic GVHD, exclusively steroids and cyclosporine A were given.

Exclusion criteria for vaccination were ongoing infections, disease relapse, immunosuppressive therapy with systemic steroid therapy > 0.2 mg/kg or with cyclosporine A > 50 ng/ml, administration of intravenous immunoglobulin in the 2 months prior to vaccination, and treatment with rituximab. Patients were vaccinated according to EBMT guidelines 3 times with an interval of at least 4 weeks (Fig. 1).

Vaccines

The pentavalent combination vaccine PENTAVAC® (Sanofi Pasteur MSD GmbH) and the pneumococcal conjugate vaccine PREVENAR 13® (Wyeth Lederle Vaccines S.A.) were administered by intramuscular injection.

For comparison of the vaccine response, a group of volunteering healthy donors (n = 13, mean age 39 years, range 27–66) was vaccinated once with PENTAVAC®.

Flow cytometry

Flow cytometry analysis was performed with a FACSCalibur instrument (Becton Dickinson, Heidelberg, Germany). All antibodies used are listed in the supplementary material (Table S1).

Measurement of serum antibody titers by ELISA

IgG serum antibody titers were measured by using ELISA for tetanus toxoid (TT); diphtheria toxoid (DT); pertussis toxoid (PT); Haemophilus influenzae type b-polysaccharide (Hib); pneumococcal polysaccharide serotypes (pn) 1, 14, 23, and 26; and poliovirus serotypes 1, 2, and 3. For TT and DT (both obtained from Statens Serum Institut, Copenhagen, Denmark), and PT (Sigma) and Hib (HbO-HA, polysaccharide conjugated to human serum albumin, obtained from NIBSC, South Mimms, UK), ELISA 96-well plates (Greiner Bio-One GmbH) were coated with 5-μg/ml antigen. For antibodies against poliovirus, a commercial ELISA was used according to the instructions of the manufacturer (Demeditec Diagnostics GmbH, Kiel, Germany). The following WHO standards were used for calibration: TE-3 for TT, 10/262 for DT, 06/140 for pertussis, 09/222 for Hib, and 82/585 for poliovirus (NIBSC, South Mimms, UK). Protective antibody concentrations were defined as ≥ 0.1 IU/ml for TT and DT, ≥ 24 IU/ml for pertussis, ≥ 1 μg/ml for Hib, ≥ 10 U/ml for polio, and ≥ 0.35 μg/ml for pneumococcal polysaccharides. A positive response was defined as ≥ 4 times the minimum level of detection in the pre-vaccination sample (d+0) and ≥ 100% increase between the pre-vaccination sample (day 0) and the post-vaccination samples.

Isolation of peripheral blood mononuclear cells and purification of B lymphocytes

Peripheral blood mononuclear cells (PBMCs) from patients and healthy donors were isolated from 80 ml of whole blood by Ficoll density gradient centrifugation (Lymphoflot®, Bio-Rad, Munich, Germany). After Ficoll separation, the PBMCs were washed, and untouched B cells were purified with a B Cell Isolation Kit II, human (Miltenyi Biotec, Bergisch Gladbach, Germany). The purity of the B cell preparations was determined by FACS analysis with CD19 antibodies for the calculation of input numbers in the enzyme-linked immuno spot (ELISPOT) assay.

Quantification of antibody-secreting cells by enzyme-linked immuno spot assay

For the quantification of total and vaccine-specific IgG antibody-secreting cells, ELISPOT multiscreen plates (Millipore, Billerica, MA, USA) were directly coated with goat anti-human IgG, Fc specific (2.5 μg/ml, DIANOVA, Hamburg, Germany), TT (2.5 μg/ml), DT (2.5 μg/ml), pertussis (1:2.000, a kind gift from Sanofi Pasteur, Marcy l’Etoile, France), and Hib (1 μg/ml Hib oligosaccharide conjugated to human serum albumin, NIBSC, South Mimms, UK) in PBS overnight at 4 °C. Multiscreen plates were precoated with goat anti-poliovirus antibody followed by incubation of an inactivated polio vaccine preparation (types 1, 2, and 3), kindly provided by Sanofi Pasteur. After washing, plates were blocked with 200 μl RPMI/10% FCS at 37 °C. Purified B lymphocytes in different cell densities were incubated in 200 μl RPMI/10% FCS for 5 h at 37 °C. Plates were washed and incubated with HRP-goat antibody to human IgG (1:1.000, DIANOVA, Hamburg, Germany) overnight at 4 °C. ELISPOTs were detected by TMB substrate (KPL/Seracare, Milford, MA, USA) and analyzed using an ELISPOT reader and AID EliSpot v5.0 (AID Diagnostics, Strassberg, Germany).

Statistical analysis

Comparison of means was performed using the Wilcoxon-Mann-Whitney test. For the analysis of the clinical predictors to the vaccination response, a multiple linear regression analysis was applied (likelihood ratio test). The threshold for the determination for a significant difference was set at p < 0.05.

Results

Decreased frequencies of memory CD27⁺ B cell subsets and increased frequencies of CD38^high CD27^high plasmablasts in transplanted patients before vaccination

Patients were vaccinated at a median of 226 days after allogeneic HSCT. The total numbers of circulating B lymphocytes were not significantly different in patients compared with healthy donors (HD, Supplementary Fig. 1A), reflecting an adequate reconstitution of B cells at this timepoint after HSCT. Patients revealed a significantly reduced frequency of CD27⁺/CD19⁺/CD38^low memory B cells compared with HD (Supplementary Fig. 1B). Both switched (IgD⁻; Fig. 2a) and non-switched (IgD⁺; Fig. 2b) memory B cell populations were significantly decreased in patients.

In contrast to the decreased memory B cell subsets, the frequency of CD38^high/CD27^high plasmablasts was higher in the patient cohort in comparison with that in the HD, but this did not reach statistical significance for the overall patient cohort (Fig. 2c). In some patients, an extremely high percentage of plasmablasts up to 31.7% of all CD19⁺ cells was observed, which was not accompanied by an EBV or CMV reactivation.

Insufficient mobilization of CD38^high CD27^high plasmablasts in HSCT patients after vaccination

It has been shown that CD38^high CD27^high plasmablast-secreting vaccine-specific IgG antibodies are mobilized in the peripheral blood 6–7 days after booster vaccination [19, 21]. These early appearing vaccine-specific plasmablasts are derived from memory B cells. As expected, on day + 7 after vaccination, we observed a significant increase of CD38^high/CD27^high plasmablasts from median 1.0% of B cells to median 11.4% of B cells in HD (Fig. 3a, b). In contrast, we did not observe a significant increase of plasmablasts in patients on day + 7 (Fig. 3a, b). In contrast to the plasmablast response, the memory B cell subsets showed no increase both in HD and in patients on day + 7 after vaccination (data not shown).

To analyze the frequencies of vaccine-specific plasmablasts, we enumerated ASCs by using an ELISPOT technique. Examples of the resulting spots for a HD and a patient before and on day + 7 after vaccination are shown in Fig. 4a and b. A threshold of detection of 1/100,000 B cells seeded was set.

For TT, specific plasmablasts were undetectable (< 1/100,000) before vaccination, and a fulminant increase to a median frequency of 1/217 on day + 7 after vaccination was observed in all HD (Fig. 4c). In some patients, TT-specific ASCs were detectable before vaccination. However, a much more moderate increase to a median frequency of 1/8547 on day + 7 after vaccination was detected in the HSCT patients (Fig. 4d). Whereas all HD responded with an increase in frequency of TT ASCs on day + 7, only 65.2% (15/23) patients responded with an increase of TT ASCs.

For DT, the frequencies of DT-specific ASCs were undetectable before vaccination and revealed a significant increase to a median frequency of 1/253 on day + 7 after vaccination in HD (Fig. 4c). In allogeneic HSCT patients, the frequencies of DT-specific ASCs showed a lower increase from ≤ 1/100,000 before to 1/35714 on day + 7 after vaccination. Whereas all HD responded with a significant increase in frequency of DT ASCs, only 65% (13/20) responded in the patient cohort (Fig. 4d).

For pertussis, ASCs were undetectable in HD before vaccination and a rise in frequency to a median of 1/3745 on day + 7 after vaccination was observed. In the patient cohort, no significant increase in the median frequency was detectable on day + 7 (Fig. 4d). Whereas all HD except one individual responded against PT, only 33.3% (5/15) of the patients showed an increase of pertussis ASCs.

For Hib, specific ASCs increased to a median frequency of 1/272 on day + 7 in HD. In patients, the frequency of Hib-specific ASCs increased to a median of 1/1779 on day + 7 after vaccination. The percentage of responders was 75% (3/4) in HD and 100% (5/5) in patients.

For poliovirus, only two HDs could be analyzed. Poliovirus-specific ASCs increased to 1/3759 on day + 7 after vaccination. In patients, a median frequency of 1/17857 on day + 7 after vaccination was measured. A total of 8/15 (53.3%) patients showed significant responses.

In addition, we found a significantly higher frequency of IgG-secreting ASCs in patients in comparison with HD before vaccination (median 1/287 in patients vs. median 1/2347 in HD, p = 0.01). Whereas in HD, IgG ASCs increased approximately 40 fold to a median frequency of 1/64 on day + 7 after vaccination (Fig. 4c), patients showed only a twofold increase to a median frequency of 1/137 (Fig. 4d).

In summary, we observed robust plasmablast responses in almost all HDs for all vaccine antigens, resulting in high frequencies of ASCs on day + 7 after booster vaccination. In allogeneic HSCT patients, the magnitude of the response was considerably lower, and a large fraction of patients did not show any detectable ASC response.

Absence of a measurable serum response in allogeneic HSCT patients on day + 7 after vaccination

Measuring the vaccine titer, we found considerably lower titers for TT, PT, DT, and poliovirus in HSCT patients prior to vaccination compared with HD (Fig. 5a–c, e). Interestingly, the Hib antibody titer was significantly higher in patients (p < 0.05). Only a fraction of patients had low protective titers against the vaccine antigens (88% for TT, 42% for DT, 8% for PT, 33% for Hib, 46% for poliovirus, 67% for pn1, 83% for pn14, 54% for pn23, 46% for pn26) (Table 2). HD showed a significant increase of serum titers for most antigens (p < 0.05) on day + 7 after booster vaccination, except for poliovirus, for which already high serum titers were measured before vaccination (Fig. 5e). HSCT patients, however, did not show a significant increase of antibody titer for any of the vaccine antigens on day + 7 after the first vaccination in serum (Fig. 5a–e), supporting the data for the low increase in vaccine-specific plasmablasts in the peripheral blood.

Table 2

Number of vaccine responders and number of patients with protective titer

Time (weeks)	0	4	8	26	52
Number of patients tested (n)	24	18	18	23	19
TTd No (%)
Responder	-	13 (72)	16 (89)	22 (96)	19 (100)
Protective titer	21 (88)	18 (100)	18 (100)	23 (100)	19 (100)
DTd No (%)
Responder	-	7 (39)	12 (67)	20 (87)	18 (95)
Protective titer	10 (42)	13 (72)	17 (94)	22 (96)	18 (95)
PTd No (%)
Responder	-	10 (55)	14 (78)	19 (83)	18 (95)
Protective titer	2 (8)	8 (44)	15 (83)	21 (91)	18 (95)
HIB No (%)
Responder	-	10 (56)	12 (67)	19 (83)	17 (90)
Protective titer	8 (33)	12 (67)	16 (89)	19 (83)	17 (90)
Poliovirus No (%)
Responder	-	2 (11)	3 (17)	6 (26)	11 (58)
Protective titer	11 (46)	10 (56)	8 (44)	12 (52)	14 (74)
Pneumococcus serotype 1 No (%)
Responder	-	10 (55)	8 (44)	17 (74)	13 (68)
Protective titer	16 (67)	13 (72)	13 (72)	22 (96)	15 (79)
Pneumococcus serotype 14 No (%)
Responder	-	10 (55)	11 (61)	15 (65)	12 (63)
Protective titer	20 (83)	18 (100)	18 (100)	23 (100)	19 (100)
Pneumococcus serotype 23 No (%)
Responder	-	12 (67)	14 (78)	21 (91)	12 (63)
Protective titer	13 (54)	13 (72)	18 (100)	23 (100)	19 (100)

Serological response in allogeneic HSCT patients after repetitive vaccination

The schedule for repetitive vaccinations and serum samples is shown in Fig. 1. The serological responses are summarized in Fig. 6 and Table 2. For all antigens except polio, the antibody titers before vaccination were below or only marginally above protective titers. Variable vaccine responses were achieved 4 weeks after the first vaccination. The median antibody titers, the percentage of responders, and the percentage of patients having achieved a protective antibody titer increased over time and recurrent vaccinations for all antigens, with the interesting exception of poliovirus. Protective antibody titers were achieved for almost all patients 1 year after the start of the vaccination.

Association of baseline immunological data and clinical parameters to vaccine plasmablast responses

We intended to find possible predictors for the highly variable plasmablast responses in vaccinated patients. As shown in Table 3, the seronegative donor and recipient CMV status (R0D0), the donor age, the number of CD3-positive and CD4-positive T cells, and the number of CD27⁺ memory B cells had a significant predictive value for the response in the ELISPOT against TT.

Table 3

Predictors for tetanus toxoid-IgG-secreting cells

Variable	B	p value	Lower 95% CL	Upper 95% CL
Dose level of ATG 2.5 vs. 7.5 mg/kg b.w.	0.6348	0.192	− 0.3440	1.6135
CMV serostatus R1D1, R1D0, R0D1 vs. R0D0	− 1.1521*	<0.01	− 1.9779	− 0.3263
Grade of acute GVHD	0.5205	0.287	− 0.4720	1.5130
Grade of chronic GVHD	0.8637	0.054	− 0.0147	1.7421
Recipient age	0.0001	0.995	− 0.0310	0.0312
Donor age	0.0469	< 0.05	0.0126	0.0812
Day of start vaccination	0.0064	0.074	− 0.0007	0.0136
Number of CD3⁺ T cells	0.0007	< 0.01	0.0002	0.0012
Number of CD4⁺ T cells	0.0041	< 0.01	0.0018	0.0064
Number of CD19⁺ B cells	− 0.0010	0.458	− 0.0038	0.0018
Percentage of CD27⁺ memory B cells	0.0860	< 0.001	0.0425	0.1295
Serum IgG concentration	0.0859	0.339	− 0.0975	0.2692

Multiple regression analysis for the estimation of relationship between of the frequencies of tetanus toxoid-secreting B cells d+7 after a single vaccination and transplant and immunological parameters before vaccination

*Recipients with CMV serostatus R0D0 had the lower frequency of anti-TT-IgG-producing B lymphocytes in comparison with CMV status R1D1, R1D0, R0D1

B, regression coefficient; CL, confidence limit

Interestingly, the ATG dose, the age of recipient, and the history of acute or chronic GVHD were no predictors for higher frequencies of TT-producing B cells in the ELISPOT assay.

High percentages of IgG-secreting plasmablasts in patients with chronic GVHD before vaccination

Patients with a moderate or severe chronic GVHD revealed the lowest number of B lymphocytes compared with patients with no or mild chronic GVHD (Fig. 7a). Interestingly, patients with moderate/severe chronic GVHD in their history had a significantly elevated frequency of plasmablasts (Fig. 7b). The frequency of IgG-secreting B cells was significantly increased in patients without or with only mild forms of chronic GVHD as well as patients with moderate/severe chronic GVHD as compared with HDs (Fig. 7c).

Discussion

In this study, we investigated for the first time the generation of antibody-secreting plasmablasts in patients after allogeneic SCT in response to a single vaccination specifically to study the contribution of memory B cells derived from the donor. It is a specific feature of memory B cells that they can form Ag-specific plasmablasts after booster vaccination appearing in a wave in the peripheral blood already 6 to 7 days after vaccination [19]. Opposite to the robust mobilization of plasmablasts and vaccine-specific IgG, ASCs in HD patients after allogeneic HSCT exhibited a much weaker increase of the frequency of plasmablasts on day + 7 after vaccination, despite a comparable age of donors and volunteers from the control group. In addition, the increase in plasmablast frequency on day + 7 after vaccination varied substantially in individual patients and ranged from undetectable plasmablast mobilization to strong plasmablast mobilization in a few individuals. Correspondingly, the increase in frequency of vaccine-specific ASCs on day + 7 after vaccination was generally low, particularly against PT. Interestingly, the ASC response against Hib was comparable to HD, suggesting immunization by bacterial infections following allogeneic HSCT.

Altogether, these findings indicated that the reactivation of vaccine-specific memory B cells in patients after allogeneic HSCT is diminished with a high degree of variability among patients. Low frequencies of memory B cells are one explanation for the attenuated plasmablast response, and we confirmed that low frequencies are also found in previous publications (Fig. 2) [12, 22, 23]. This is supported by a correlation of the frequency of CD27⁺ memory cells with the d+7 plasmablast response against TT in our patients. However, other factors influence the early plasmablast response. First, the frequency of CD4⁺ T cells correlated with the plasmablast response against TT, indicating a T helper cell-dependent memory response against TT. A positive correlation with the age of the donor furthermore suggests a better vaccination status among older donors. Importantly, the dose of ATG and the severity of previous acute and chronic GVHD had no influence on the plasmablast response. Our finding that the CMV status of the donor or recipient is associated with significantly higher plasmablast responses is interesting in the light of recent findings of Furman et al., showing that CMV-seropositive young adults exhibited enhanced antibody responses to influenza vaccination [24].

The origin of memory B cells in patients after allogenic HSCT is therefore an important question for the understanding of memory B cell biology in these patients. Unselected peripheral stem cell preparations contain high numbers of memory B cells that are transferred to the recipient [2]. These memory cells from the vaccinated donor most likely give rise to the antigen-specific plasmablast response on day 7. It remains to be analyzed in the future what parameters allow survival and/or reactivation of theses donor-derived memory B cells only in some patients. Treatment with ATG might be one factor influencing the number of memory B cells surviving in the recipient. It has been shown that the presence of B cell reactive antibodies in the ATG preparations can deplete B cells as well as plasma cells [25]. The recovery of CD19⁺ B cells was significantly delayed in patients with allografts from unrelated donors receiving ATG as compared with patients with allografts from a matched family donor which had no ATG [26]. Importantly, however, adoptive transfer of additional memory B cells from the donor after transplantation might be a promising approach to lower the risk of post-transplant infections.

We performed three repetitive vaccinations in the patient cohort as suggested by the EBMT guidelines [27]. After these consecutive vaccinations, most patients exhibited protective antibody titers. Our detailed quantitative analysis of antibody titers extends previous findings [27‐29] and confirms the efficacy of the vaccination regimen in patients after allogeneic HSCT.

In contrast to the low numbers of CD27⁺ memory B cells and to low mobilization of plasmablast after vaccination, we found a high frequency of plasmablasts in patients before vaccination. Elevations of spontaneous Ig-secreting plasmablasts have been described for patients with active chronic GVHD [30, 31] and also for patients with active systemic lupus erythematodes (SLE) [32]. The elevated plasmablast frequency is a sign of a general dysregulation of the B cell compartment that is associated with chronic GVHD as reviewed recently [33]. The specificity of the antibodies secreted by these plasmablasts remains elusive, however.

In summary, the weak mobilization of plasmablasts and the lack of serum response on day 7 after antigen contact by a booster vaccination illustrated the immunodeficiency produced by allogeneic HSCT. Instead, a dysregulation of the functional B cell response with high frequencies of plasmablasts can be observed in patients after allogeneic HSCT. The specificity of the antibodies produced by the plasmablasts remains to be investigated and could contribute to the understanding of the pathogenesis of chronic GVHD.

Acknowledgments

The authors acknowledge the help of Manuela Plischke and Katja Sigurnjak in collecting patients’ samples.

Compliance with ethical standards

The study was approved by the institutional research ethics committee of the university Erlangen (Re. No. 147-12B). All patients provided informed consent.

Conflict of interest

The authors declare that they have no conflict of interest.

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Titel: Measuring the cellular memory B cell response after vaccination in patients after allogeneic stem cell transplantation
verfasst von: Julia Winkler
Hannes Tittlbach
Andrea Schneider
Corinna Buchstaller
Andreas Mayr
Ingrid Vasova
Wolf Roesler
Michael Mach
Andreas Mackensen
Thomas H. Winkler
Publikationsdatum: 09.06.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: Annals of Hematology / Ausgabe 8/2020
Print ISSN: 0939-5555
Elektronische ISSN: 1432-0584
DOI: https://doi.org/10.1007/s00277-020-04072-9

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Measuring the cellular memory B cell response after vaccination in patients after allogeneic stem cell transplantation

Abstract

Electronic supplementary material

Publisher’s note

Introduction

Methods

Patients, healthy donors, and vaccination

Vaccines

Flow cytometry

Measurement of serum antibody titers by ELISA

Isolation of peripheral blood mononuclear cells and purification of B lymphocytes

Quantification of antibody-secreting cells by enzyme-linked immuno spot assay

Statistical analysis

Results

Decreased frequencies of memory CD27⁺ B cell subsets and increased frequencies of CD38^high CD27^high plasmablasts in transplanted patients before vaccination

Insufficient mobilization of CD38^high CD27^high plasmablasts in HSCT patients after vaccination

Absence of a measurable serum response in allogeneic HSCT patients on day + 7 after vaccination

Serological response in allogeneic HSCT patients after repetitive vaccination

Association of baseline immunological data and clinical parameters to vaccine plasmablast responses

High percentages of IgG-secreting plasmablasts in patients with chronic GVHD before vaccination

Discussion

Acknowledgments

Compliance with ethical standards

Conflict of interest

Publisher’s note

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Abstract

Electronic supplementary material

Publisher’s note

Introduction

Methods

Patients, healthy donors, and vaccination

Vaccines

Flow cytometry

Measurement of serum antibody titers by ELISA

Isolation of peripheral blood mononuclear cells and purification of B lymphocytes

Quantification of antibody-secreting cells by enzyme-linked immuno spot assay

Statistical analysis

Results

Decreased frequencies of memory CD27+ B cell subsets and increased frequencies of CD38high CD27high plasmablasts in transplanted patients before vaccination

Insufficient mobilization of CD38high CD27high plasmablasts in HSCT patients after vaccination

Absence of a measurable serum response in allogeneic HSCT patients on day + 7 after vaccination

Serological response in allogeneic HSCT patients after repetitive vaccination

Association of baseline immunological data and clinical parameters to vaccine plasmablast responses

High percentages of IgG-secreting plasmablasts in patients with chronic GVHD before vaccination

Discussion

Acknowledgments

Compliance with ethical standards

Conflict of interest

Publisher’s note

Unsere Produktempfehlungen

e.Med Interdisziplinär

e.Med Innere Medizin

Electronic supplementary material

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