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Erschienen in: Journal of Clinical Immunology 1/2024

Open Access 01.01.2024 | Original Article

Plasma Levels of mir-34a-5p Correlate with Systemic Inflammation and Low Naïve CD4 T Cells in Common Variable Immunodeficiency

verfasst von: Sofia Nyström, Jonas Hultberg, Emelie Blixt, Åsa Nilsdotter-Augustinsson, Marie Larsson

Erschienen in: Journal of Clinical Immunology | Ausgabe 1/2024

Abstract

Purpose

Common variable immunodeficiency (CVID) is a primary antibody deficiency that commonly manifests as recurrent infections. Many CVID patients also suffer from immune dysregulation, an inflammatory condition characterized by polyclonal lymphocytic tissue infiltration and associated with increased morbidity and mortality. The genetic cause is unknown in most CVID patients and epigenetic alterations may contribute to the broad range of clinical manifestations. MicroRNAs are small non-coding RNAs that are involved in epigenetic modulation and may contribute to the clinical phenotype in CVID.

Methods

Here, we determined the circulating microRNAome and plasma inflammatory proteins of a cohort of CVID patients with various levels of immune dysregulation and compared them to healthy controls. A set of deregulated microRNAs was validated by qPCR and correlated to inflammatory proteins and clinical findings.

Results

Levels of microRNA-34a correlated with 11 proteins such as CXCL9, TNF, and IL10, which were predicted to be biologically connected. Moreover, there was a negative correlation between mir-34 levels and the number of naïve CD4 T cells in CVID.

Conclusion

Collectively, our data show that microRNAs correlate with the inflammatory response in CVID. Further investigations are needed to elucidate the role of miRNAs in the development of CVID-related immune dysregulation.
Hinweise

Supplementary Information

The online version contains supplementary material available at https://​doi.​org/​10.​1007/​s10875-023-01618-0.

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Introduction

Common variable immunodeficiency disorder (CVID) is an inborn error of immunity with an estimated incidence of 1:20000 in Europe. It is a heterogeneous disorder characterized by hypogammaglobinemia [13]. Immunoglobulin replacement therapy reduces the number of bacterial infections [4]. Many CVID patients develop non-infectious complications that relate to immune dysregulation (ImD) and contribute to increased morbidity and mortality [4]. CVID-related ImD includes autoimmunity, lymphocytic infiltration of non-lymphoid tissues, lymphoid hyperplasia, and lymphoma [2]. Patients with increased frequencies of atypical B cells with low expression of CD21 and decreased naïve CD4 T cells are at higher risk of ImD complications [57]. CVID-related ImD is associated with increased interferon (IFN)-γ activity [810]. Treatment to mitigate ImD in CVID is so far mostly restricted to nonspecific immunosuppressive therapy [11, 12].
Currently, pathogenic monogenic variants have been identified in 35% of the patients with CVID [13, 14]. Variants of genes originally identified in non-CVID immunodeficiencies have also been observed in CVID patients, emphasizing the complex underlying genetics of this disorder [15, 16]. Alterations in epigenetic regulators can cause malfunctions of the immune system [17]. In addition to genetic variants, epigenetic changes may contribute to the development of CVID [16, 18]. It was recently reported that epigenetic alterations affecting DNA methylation may contribute to B cell failure in CVID [19].
MicroRNAs (miRNA) are short non-coding RNAs that are involved in epigenetic regulation and function mainly to repress gene expression. For instance, miRNAs are involved in the regulation of B cell differentiation and have been associated with autoimmune disease and B cell lymphomas [2023]. Increased T cell expression of mir-201 has been reported in a small cohort of CVID patients [24]. Changes in circulating miRNAs reflect ongoing biological processes in the tissues and can be used as biomarkers in cancer, autoimmune, and infectious diseases [2527]. Alteration of miRNA signatures in CVID can be considered the result of epigenetic processes and may contribute to the pathophysiology of CVID and CVID-related ImD. Epigenetic studies on CVID are scarce.
In the present study, we used next-generation sequencing to profile plasma miRNA signatures in CVID patients with and without ImD. Selected miRNAs were validated by polymerase chain reaction (PCR) and correlated to plasma proteins and the levels of naïve CD4 T cells. Predicting disease-associated miRNAs may increase the understanding of the disease mechanisms of CVID and pave the way for new treatment strategies.

Methods

Ethical Approval

This study was approved by the Regional Ethics Committee of Linköping, Sweden (2017/214–32). All study subjects enrolled in this study gave their written informed consent to participate in this study.

Study Subjects

The definition of CVID in this study follows the former Swedish Guidelines on Primary Immunodeficiency Disorders; in brief, serum IgG < 3.0g/L and IgA < 0.07g/L in the absence of any secondary immune deficiency. The cohort included 10 CVID patients with no to moderate ImD, i.e., infections only (CVIDInO), and 10 CVID patients with severe ImD complications (CVIDC). Clinical data were retrieved from their medical records and covered the time of the study start and 10 years back. An evaluation document was used to score the burden of infections and ImD as previously described [10]. In brief, patients were assessed for the presence of ImD across three items: autoimmunity, gastroenteropathy and lymphoproliferation. Each item was scored 0–4; hence, the sum formed an ImD score between 0 and 12. Patients were also given an infection score between 0 and 4 based on the number of suspected bacterial infections per year after initiation of IgG-substitution therapy. Information about B cell subsets was retrieved from the clinical records, and patients were classified according to the Freiburg CVID criteria [28]. Patients were compared to a group of healthy controls recruited among blood donors, who were matched for sex and age (Table 1).
Table 1
Demographics and clinical characteristics of study participants
 
CVIDInO (n = 10)
CVIDC (n = 10)
HC (n = 10)
Age, years, median (range)
57 (21–76)
51 (22–74)
52 (28–68)
Sex, female/male
1/9
4/6
4/6
CVID duration, years, median (range)
 > 10 (0 to > 10)
6 (1 to > 10)
N/A
Freiburg class 1 (1a), n
5 (2)
9 (8)
N/A
CD4+ T cells/µL, median (range)
491 (338–1260)
739 (289–1766)
811 (274–1743)
CD8+ T cells/µL, median (range)
482 (225–1126)
474 (187–2328)
372 (160–703)
CD4/CD8, median (range)
1.4 (0.6–2.2)
1.7 (0.2–2.6)
2.2 (1.2–4.3)
InO, infection only; C, CVID with immune dysregulation complications; HC, healthy controls

Materials

A detailed list of all key resources including reagents for flow cytometry, critical commercial assays, software, and algorithms is available in supplementary information Table S1.

Blood Sample Collection and Plasma Preparation

Blood samples were obtained in vacutainer tubes (BD Biosciences). The samples were kept at room temperature for up to 5 h before the plasma was separated and stored at − 80°C until used.

Flow Cytometry for Quantification of Peripheral T Cells

Absolute T cell numbers were determined by flow cytometry with the use of Tru count tubes (BD Biosciences). Briefly, antibodies were added to whole blood and samples were lysed with FACS lysing solution (BD biosciences) before data were acquired using FACS Canto II (BD Biosciences). Kaluza flow cytometry software version 1.5 (Beckman Coulter) was used for data analysis.

RNA Extraction, Library Construction, and High-Throughput Sequencing

RNA extraction, library construction, and high-throughput analyses were carried out by QIAGEN Genomic Services in Hilden, Germany. In brief, RNA extracted from plasma with miRNeasy kit (QIAGEN) was converted into miRNA next-generation sequencing libraries. Adapters containing unique molecular identifiers (UMI) were ligated to the RNA. Then, the RNA was converted to cDNA and amplified using PCR. Libraries were pooled in equimolar ratios and quantified by qPCR before being sequenced on a NextSeq (Illumina Inc., San Diego, CA, USA) according to the manufacturer’s instructions.

The miRNA-seq Data Analysis

Raw data was de-multiplexed and FASTQ files for each sample were generated using the bcl2fastq software (Illumina Inc.). All primary analysis was carried out using CLC Genomics Server 21.0.4 (Qiagen). The workflow “QIAseq miRNA Quantification” of the CLC Genomics Server with standard parameters was used to map the reads to miRBase version 22. In short, the reads were trimmed, before filtering of reads with length < 15 nt or length > 55 nt. The reads were then deduplicated using their UMI. Reads were grouped based on the UMI sequences. Reads that failed mapping to the miRbase were mapped to the human genome, using the “RNA-Seq Analysis” workflow of the CLC Genomics Server.

Identification of Differentially Expressed miRNAs

The empirical analysis of the differential gene expression algorithm of the CLC Genomics Workbench was used for differential expression analysis. For all unsupervised analysis, only miRNAs that had at least 10 counts summed over all samples were considered. A variance stabilizing transformation was performed on the raw count matrix using the function of the R package DESeq2 version 1.28.1. Five hundred genes with the highest variance were used for the principal component analysis. Thirty-five genes with the highest variance across samples were selected for hierarchical clustering.

Targeted Analysis of miRNA with Real-Time qPCR

In brief, extracted RNA was reverse transcribed using the miRCURY LNA RT Kit (QIAGEN). cDNA was assayed in PCR reactions according to the protocol for miRCURY LNA miRNA PCR using miRCURY LNA SYBR Green master mix. The amplification was performed in a LightCycler® 480 Real-Time PCR System (Roche Diagnostics, Basel, Switzerland) in 384 well plates. Target miRNA Cq values were normalized to global mean Cq of hsa-miR-23a-3p and hsa-let-7d-3p, using the formula:
$$\mathrm{Normalized}\;\mathrm{dCq}=\mathrm{global}\;\mathrm{mean}\;\mathrm{Cq}\;\left(\mathrm{sample}\;n\right)-\mathrm{target}\;\mathrm{Cq}\;\left(\mathrm{sample}\;n\right)$$

Target Gene Prediction

The miRNA Enrichment Analysis and Annotation Tool (miEAA) was used for target gene prediction using over-representation analysis (ORA) with at least three hits among input deregulated miRNAs and FDR < 0.01. When CVIDC- or CVIDInO groups were compared to healthy controls, differently expressed miRNAs with FDR < 0.01 were considered deregulated and miRNAs with FDR < 0.1 when the CVIDC group was compared to the CVIDInO group. The Uniprot database was used to find Biological Process GO-terms of predicted target genes.

Targeted Proteomic Analysis

Frozen plasma samples were sent to the Clinical Biomarkers facility, Science for Life Laboratory, Uppsala, Sweden, for analysis. The multiplex protein extension assay (PEA), OLINK Target 96 Inflammation v.3021, was used for the detection of 92 different inflammatory-associated proteins (Table S2). Seventy-two proteins were detected in > 95% of samples and selected for further analysis. Thirty-two of these proteins were differently expressed (t-test FDR < 0.05) when comparing CVID patients with healthy controls and were used for the construction of a correlation matrix with normalized miRNA dCq-values.

Protein–Protein Interaction Analysis

Protein–protein interaction networks were created with differently expressed proteins using STRING version 11.5 (http://​string-db.​org/​) by including interactions with a medium confidence score (> 0.7). STRING database is a curated knowledge database of known and predicted protein–protein interactions [29].

Statistical Analysis

An Exact Test was used for comparing miRNA profiles generated by high-throughput sequencing, and Benjamini–Hochberg correction was applied to adjust for multiple testing. The Mann–Whitney test and Kruskal–Wallis test with Dunn’s correction were used for univariate statistics comparing two or three groups, respectively. Spearman’s was used for correlation measures.

Results

Demographics and Clinical Characteristics of the Patient Cohort

CVIDC patients (with severe immune dysregulation) and CVIDInO patients (with infection-only phenotype) were included in the study (Table 1). All patients had ongoing immunoglobulin replacement therapy but had not received any immunomodulatory drugs at the time when the samples were collected. The disease-infectious scoring system used by us had a strong correlation with previously published [30] disease severity score for CVID and CVID-like disorders (Fig. S1). Information about mild manifestations such as uncomplicated airway infections and isolated elevation of alkaline phosphatase in infection-only patients were missing in our dataset and not included in the comparison. In the CVIDC group, disease scores, including polyclonal lymphoproliferation, autoimmunity, and gastroenteropathy, ranged between 3 and 11, compared to 0–2 in the CVIDInO group (Fig. 1a). There were no differences in the infection scores between the two groups (Fig. 1b). Even if the CD4 T cell counts were similar between the groups, the frequencies of peripheral naïve CD4 T cells were lower in CVIDC patients, further reflecting a more severe clinical phenotype (Fig. 1c–d). Seven of the CVID patients have been subjected to exome analysis targeting genetic variants in accordance with IUIS Phenotypical Classification for Human Inborn Errors of Immunity [14]. All genotyped patients belonged to the group with immune dysregulation, and one patient was diagnosed with CTLA4 haploinsufficiency. In two patients, heterozygous variants of uncertain significance have been detected involving a member of the VAV gene family and a gene coding for an immunoglobulin like receptor. No pathological variant was detected in any of the other tested patients. Two of the patients in the CVIDc group that have not been genotyped have mild immune dysregulation (scores 3–4), and the third is deceased with no family history of CVID, which may explain why gene testing has not been performed.

Mapping to Small RNA Databases

Sequencing technology was used to measure the expression of small RNAs (15–55 bases) extracted from plasma. In total, 262 small RNAs were detected in all samples, and another 143 were found in more than 70% of the samples. Percentages of the reads that could be mapped to the miRBase or piRNA database varied between 6.4 and 39% across all three groups (Fig. S2).

Shared and Unique Circulating miRNA Signatures in CVID Patients with Different Phenotypes

Dimensional reduction of transformed raw counts of the 500 miRNAs with the highest variance across samples showed a separation between healthy controls and CVID patients when the data were projected to principal component (PC) 1 and PC2 (Fig. 2a). CVID patients clustered into two groups, and one cluster was dominated by patients with an increased infection score, suggesting that the burden of infections may influence the plasma miRNA profiles. We performed a pair-wise comparison of the levels of circulating miRNAs between the CVIDC group (n = 10) and healthy controls (n = 10), and the CVIDInO group (n = 10) and healthy controls, to identify significantly deregulated miRNAs in plasma. When comparing CVIDC patients and healthy controls, a total of 24 circulating miRNAs were deregulated in CVIDC patients, when a false discovery rate (FDR) of < 0.01 was applied (Table S3a). Thirteen miRNAs were upregulated in CVIDC, and another 11 were downregulated. When comparing CVIDInO patients and healthy controls, a total of 24 circulating miRNAs were deregulated (Table S3b). Seven miRNAs were upregulated, and another 17 were downregulated in the CVIDInO group when compared to healthy controls. The normalized expressed reads of the 39 significantly deregulated miRNAs were analyzed, and we found a clear separation between CVID patients and healthy controls and that the infection burden, i.e., infection scores, did not contribute to the separation between the two CVID groups (Fig. 2b). ORA using the miRNA enrichment and analysis and annotation tool (miEAA) [31] identified 14 candidate genes (FDR < 0.01) targeted by the 24 miRNAs deregulated in CVIDC patients and eight candidate genes (FDR < 0.01) targeted in CVIDInO patients (Table 2). Five of the 14 candidate genes predicted by the CVIDC deregulated miRNAs were annotated with gene ontology (GO)-child terms of “immune system process.” Two of the most significantly affected genes, DAPK1 and WNT5A, were annotated with the GO-term “cellular response to type 2 interferons” (Table 2). Together, these findings indicate that miRNAs may modulate immune functions associated with CVID-related ImD.
Table 2
Predicted candidate gene targets biological process annotations
Target
FDR
Expected
Observed
Annotated BP GO-terms
CVID with immune dysregulation vs HC
All#
ISP*
Biological process
  CASP3
0.0017
0.3308
6
55
5
T cell homeostasis, B cell homeostasis
  DAPK1
0.0017
0.1890
5
19
1
Cellular response to type II interferon
  PTEN
0.0077
1.1343
8
91
4
T cell proliferation
  BCL2
0.0097
0.633
6
130
11
T cell homeostasis, B cell homeostasis
  TGFBR3
0.0097
0.6276
6
35
2
Immune response
  NFKB1
0.0092
0.1607
4
32
0
 
  CKAP5
0.0021
0.0945
4
10
0
 
  ADNP
0.0078
0.0472
3
23
0
 
  JMY
0.0092
0.5671
6
9
0
 
  PDK4
0.0092
0.0567
3
16
0
 
  GGA3
0.0097
0.3497
5
10
0
 
  USP47
0.0097
0.1891
4
16
0
 
  DERL1
0.0097
0.0662
3
10
0
 
  PROSER1
0.0094
0.0656
3
N/A
-
 
  DICER1
0.0098
0.6617
6
20
0
 
  NUS1
0.0098
0.6617
6
11
0
 
  ZNF480
0.0098
0.1985
4
1
0
 
CVID infection only
All#
ISP*
Biological process
  WNT5A
0.0067
0.2930
5
153
6
Cellular response to type II interferon
  PDE4B
0.0067
0.0473
3
15
4
Neutrophil homeostasis
  SMN1
0.0041
0.0851
4
4
0
 
  BAZ1B
0.0067
0.1229
4
10
0
 
  SERPINB5
0.0067
0.1323
4
5
0
 
  STUB1
0.0067
0.0378
3
27
0
 
  TCEAL1
0.0099
0.1607
4
N/A
-
 
  RAI14
0.0099
0.0567
3
2
0
 
HC, healthy controls; FDR, false discovery rate; #Total number annotated gene ontology (GO) terms biological process (BP). *Number annotated BP GO-terms within the item immune system process (ISP)

Differences in Circulating miRNA Signatures in CVIDC- and CVIDInO Patients

When the two CVID groups were compared with each other, we applied FDR < 0.1. Three miRNAs were increased, and five miRNAs were decreased in CVIDC patients compared to CVIDInO patients (Fig. 3a). ORA identified 13 candidate genes (FDR < 0.01) targeted by the eight miRNAs deregulated in the CVIDC-group compared to the CVIDInO-group (Fig. 3b). Among the 13 candidate genes, NOTCH2, PIK3CA, PTPRD, CASP3, RAB34, and FLOT2 were annotated with GO terms related to the immune system process, including “T- and B cell homeostasis”. Except for CASP3, the predicted candidate genes were distinct from the predicted candidate genes when comparing CVID patients with healthy controls. In summary, the miRNA patterns differed between CVIDInO- and CVIDC patients, suggesting distinct sets of predicted candidate genes.

Targeted Analysis Deregulated miRNAs with Real-Time PCR

IFN-γ is a potential underlying driver of CVID-related ImD [10]. DAPK1 is a protein kinase, which regulates IFN-γ induced gene expression [32]. When, as the next step, we wanted to verify the plasma levels of the miRNAs sharing the predicted gene target DAPK1 with real-time qPCR. In addition, the two most deregulated miRNAs between the CVIDInO- and CVIDC group were analyzed by qPCR (Table S4). Eight miRNAs were analyzed by RT-PCR. Four of these miRNAs were only detected in 3–70% of the samples and were excluded from further analysis due to low call rate. One sample (CVIDInO) had an overall low call rate and was omitted from analysis. Of a total of eight analyzed miRNAs, four were detected in > 75% of samples and selected for further analysis (Table S4).

Correlation of Circulating miRNAs with Plasma Levels of Inflammatory Proteins

We found a negative correlation between mir-34a-5p and mir-103a-3p normalized dCq plasma levels (Spearman correlation, rs =  − 0.53 and p = 0.003), and a positive correlation between mir-103a-3p and mir-301a-3p (rs = 0.469 and p = 0.001) dCq levels (Fig. S3). The plasma levels of mir-34a-5p were higher in CVIDInO- and CVIDC patients compared to the controls, whereas the levels of mir-103a-3p were decreased in CVIDInO- and CVIDC patients compared to healthy controls (Fig. 4a). When comparing CVID plasma inflammatory protein profiles, 32 factors were elevated (T-test, FDR < 0.05) compared to the healthy controls (Table 3). To outline any association of deregulated miRNAs, circulating dCq levels were correlated to normalized levels of 32 deregulated proteins in plasma. In total, 15 proteins showed a positive correlation (rs ≥ 0.60 and p < 0.001) with mir-34a-5p or a negative correlation (rs ≤ -0.60 and p < 0.001) with mir-103a-3p dCq levels (Table 3). No protein correlated with mir-301a-3p. Most of the proteins (n = 8) correlated with both mir-34a-5p and mir-103a-3p dCq levels: another three proteins correlated with mir-34a-5p and another six with mir-103a-3p (Fig. S4). We then used the proteins correlating with mir-34a-5p or mir-103a-3p to generate a protein interaction (PPI) network. Known and predicted interactions were revealed between seven of 11 factors correlating with mir-34a-5p and between eight of 14 factors correlating with mir-103a-3p (Fig. 4b). Proteins associated with mir-34a-5p or mir-103a-3p were predicted to be enriched (p = 4.3 × 10−11 and p = 6.5 × 10−13, respectively). TNFRSF9, CXCL9, IL10, IL12B, and CSF-1 were shared in the predicted networks of proteins correlating with mir-34a-5p and mir-103a-3p. Functional annotation predicted the biological process “Regulation of chronic inflammatory response to antigenic stimulus” (GO:0002874), involving IL10 and IL18, to be the interaction with the highest strength in the network, correlating with mir-34a-5p (strength 3.07 and FDR = 0.0012). For proteins correlating with mir-103-3p, the biological process “Negative regulation of inflammatory response to antigenic stimulus” (GO:0002862), involving IL10 and IL12B, had the highest strength (strength 2.33 and FDR = 0.0079). In summary, our results suggest that increased levels of mir-34a-5p and decreased levels of mir-103a-3p may contribute to the chronic inflammatory response in CVID-related ImD.
Table 3
Correlation of plasma protein levels with circulating miRNA dCq levels
Assay
CVID C(n = 10)
CVID InO (n = 8)
HC (n = 9)
mir-34a (n = 27)
mir-103a (n = 27)
mir-301a (n = 27)
NPX (Log2)
Mean
SD
Mean
SD
Mean
SD
r
p (-log10)
r
p (-log10)
r
p (-log10)
IL-12B
7.52
0.46
6.16
0.78
5.05
0.39
0.71
4.63
 − 0.65
3.69
 − 0.26
0.76
TNFRSF9
8.87
0.52
7.19
0.48
6.27
0.19
0.68
4.17
 − 0.63
3.51
 − 0.33
1.06
TNF
4.30
0.64
2.83
0.52
2.20
0.35
0.67
4.02
 − 0.58
2.90
 − 0.22
0.59
IL10
5.85
0.45
4.75
0.62
3.19
0.12
0.66
3.93
 − 0.62
3.38
 − 0.41
1.52
CDCP1
4.47
0.78
2.44
0.65
1.93
0.32
0.66
3.87
 − 0.70
4.50
 − 0.31
0.98
CD5
6.44
0.47
4.93
0.35
4.37
0.16
0.66
3.86
 − 0.67
4.09
 − 0.21
0.56
CST5
5.38
0.46
4.98
0.49
4.60
0.24
0.66
3.83
 − 0.70
4.40
 − 0.28
0.83
CXCL9
10.00
0.79
7.61
0.92
6.48
0.36
0.65
3.70
 − 0.71
4.60
 − 0.28
0.84
IL18
9.85
0.85
8.41
0.59
7.66
0.29
0.64
3.57
 − 0.52
2.35
 − 0.19
0.47
CCL25
6.28
0.39
6.12
0.32
5.70
0.36
0.61
3.19
 − 0.56
2.73
 − 0.17
0.41
CSF-1
9.99
0.14
9.52
0.15
9.19
0.19
0.60
3.11
 − 0.75
5.36
 − 0.34
1.12
IL6
4.54
0.75
3.31
0.58
2.27
0.44
0.59
3.03
 − 0.74
5.13
 − 0.32
1.00
CCL3
6.09
0.65
4.62
0.53
4.02
0.46
0.58
2.90
 − 0.53
2.45
 − 0.18
0.45
CD244
7.24
0.38
6.40
0.22
6.15
0.36
0.58
2.87
 − 0.57
2.79
 − 0.13
0.28
IL-15RA
2.06
0.43
1.05
0.33
0.84
0.27
0.57
2.82
 − 0.65
3.69
 − 0.17
0.42
IFN-gamma
8.76
1.38
5.90
0.91
5.30
0.57
0.56
2.76
 − 0.47
1.93
 − 0.16
0.37
CXCL10
11.69
0.52
9.41
0.89
8.84
0.36
0.56
2.72
 − 0.67
4.06
 − 0.20
0.50
CD6
6.86
0.75
4.93
0.56
4.44
0.52
0.54
2.53
 − 0.55
2.64
 − 0.07
0.15
CD8A
11.62
0.65
10.49
0.72
9.98
0.50
0.54
2.52
 − 0.45
1.80
0.00
0.01
CASP-8
1.45
0.27
1.05
0.32
0.64
0.18
0.53
2.40
 − 0.71
4.65
 − 0.27
0.76
CCL19
11.19
0.69
8.97
0.79
8.68
0.91
0.52
2.37
 − 0.44
1.69
 − 0.03
0.05
CXCL6
8.71
0.48
7.63
0.67
7.12
0.68
0.50
2.18
 − 0.52
2.38
 − 0.17
0.41
CD40
11.57
0.40
10.75
0.28
10.57
0.30
0.50
2.14
 − 0.63
3.48
0.00
0.01
CCL20
7.64
0.79
6.53
1.15
5.96
0.82
0.48
2.01
 − 0.33
1.07
0.14
0.32
LIF-R
3.80
0.31
3.21
0.26
3.13
0.17
0.47
1.91
 − 0.46
1.88
 − 0.33
1.07
TNFB
5.60
0.41
4.42
0.62
3.81
0.41
0.45
1.82
 − 0.42
1.56
 − 0.08
0.16
IL-18R1
8.87
0.47
7.84
0.49
7.66
0.36
0.44
1.72
 − 0.54
2.55
 − 0.11
0.24
PD-L1
6.85
0.37
5.85
0.33
5.72
0.34
0.43
1.68
 − 0.57
2.77
 − 0.20
0.52
CXCL11
9.63
0.94
7.30
0.58
7.41
0.61
0.43
1.66
 − 0.47
1.91
0.04
0.08
TNFSF14
4.50
0.64
3.49
0.27
3.26
0.52
0.39
1.40
 − 0.56
2.74
0.05
0.10
MMP-10
8.74
0.35
8.12
0.65
7.78
0.39
0.33
1.08
 − 0.64
3.64
 − 0.16
0.39
AXIN1
1.70
0.49
1.17
0.74
2.41
1.24
 − 0.38
1.31
0.11
0.23
0.40
1.47
dCq, normalized cycle of quantification; C, CVID with immune dysregulation complications; InO, CVID infection only; NPX, normalized protein expression; SD, standard deviation; r, Spearman correlation

Circulating mir-34a-5p Correlated with Naïve CD4 T Cells in CVID

Low levels of naïve CD4 T cells represent a finding strongly associated with CVID-related ImD without a direct connection to disease-causing genetic variants [7], which support that additional mechanisms may contribute to the heterogeneity of the clinical phenotype seen in CVID. This led us to investigate potential associations between deregulated miRNAs and naïve CD4 T cells in CVID patients. We found that mir-34a-5p dCq levels correlated negatively with numbers of circulating naïve CD4 T cells (Fig. 4c). No such correlation was found for mir-103a-3p (data not shown). We next used GeneTrail2 to identify the predicted target genes of mir-34a-5p annotated with the ancestral GO biological process term “Immune system process” (GO:0002376). The putative targets were predicted to be overrepresented in the pathway since 176 were detected compared to 113 expected (p = 2.0 × 10−8). We next compared the putative mir-34a-5p targets with the proteins analyzed in plasma and found that four putative mir-34a-5p targets (CD40, CXCL9, IL10, and TNF) overlapped (Table S5). The plasma levels of all four mir-34a-5p targets CD40, CXCL9, IL10, and TNF were all significantly higher in CVIDC patients compared to CVIDInO patients (Fig. 4d). Together these findings support a potential role of mir-34a-5p in CVID-related ImD.

Discussion

This study is, to our knowledge, the first to delineate the circulating miRNAome in CVID and to correlate the findings to CVID-related ImD. We found various miRNAs that distinguished the CVID patients with severe ImD complications (CVIDC) from the infection-only CVID phenotype (CVIDInO), as well as the CVID groups from healthy controls. The burden of non-infectious complications in CVID was assessed by a clinical severity scoring system assessing lymphoproliferation, autoimmunity, and gastrointestinal complications [10]. The accuracy of the scoring system was validated using the more extensive CVID disease severity score published by Ameratunga in 2018 [30]. Incomplete data of mild manifestations should not affect the results significantly since mild manifestations only generated a score of 1 using the Ameratunga scoring system. Twenty-four miRNAs were altered between CVIDC patients and the controls, and 24 between CVIDInO patients and the controls. Several genes involved in adaptive immune mechanisms, including a gene involved in type 2 interferon signaling, were predicted candidate gene targets of deregulated miRNAs in the CVIDC group. We and others have previously shown that IFN-γ correlates with CVID-related ImD [10, 32]. The top predicted gene targets in the CVIDInO group were merely associated with inflammatory processes and innate immunity. Low naïve CD4 T cells are associated with severe disease and a poor outcome in CVID. Targeted analysis with qPCR showed a negative correlation between naïve CD4 T cell numbers and mir-34a-5p expression, and the plasma levels of four putative mir-34a-5p gene targets, i.e., CD40, CXCL9, IL10, and TNF, were elevated in CVIDC compared to CVIDInO patients. Determining correlations between miRNAs and clinical and laboratory findings may provide new mechanistic insights into CVID-related ImD since circulating miRNA transcripts reflect intracellular gene network activity in tissues [26].
The majority of CVID cases are sporadic and the onset can occur at any age. A few pathogenic gene variants have been associated with CVID [14, 15]. However, only a minority of CVID cases appear to be the result of a monogenic variant. Instead, transcriptional and post-transcriptional modifications may contribute to the clinical penetrance of genetic variants in CVID, alone or in combination with other triggers such as infections [16]. Increasing evidence indicates that miRNAs play a key role in biological processes by their modulation of gene expression [33]. While the plasma miRNA profiles clearly discriminated between CVID patients and healthy controls, the differences between the CVIDC- and the CVIDInO patients were less pronounced. However, the distinct circulating miRNA profiles found in CVIDC- and in CVIDInO patients compared to the controls suggest that deregulated expression of circulating miRNAs may contribute to the heterogeneity of CVID phenotypes. In addition, ORA of differently expressed miRNAs identified several potential gene targets involved in T- and B cell homeostasis in CVID patients with severe ImD. These findings imply that miRNAs may contribute to the changes in T- and B-cell populations found in this group of CVID. For instance, DAPK-1 was one of the most highly predicted gene targets in the CVIDC group compared to the controls. DAPK-1 is a tumor suppressor induced by IFN-γ [34, 35] and can also influence the expression of IFN-γ [36]. Altered DAPK1 activity may impair CVID T cell functionality, seeing that DAPK1 has been linked to the regulation of T cell function [37, 38]. WNT5A was another predicted target when comparing the miRNA profiles of CVIDInO patients with healthy controls. WNT5A, like DAPK1, is a tumor suppressor which can also modulate T cell activation [3941]. Taken together, dysregulation of DAPK1 and WNT5A may contribute to the heterogeneity of the immune defects observed in CVID.
When comparing the plasma miRNA profiles of the two CVID groups, the highest upregulated miRNA in CVIDC was mir-224-5p. Mir-224 expression is upregulated via NFΚB and has been reported to attenuate the inflammatory responses by interaction with the acute phase protein pentraxin 3 [42, 43]. The CVIDC group had low levels of mir-1-3p, and this miRNA has been found to modulate immune cell functions and contribute to inflammatory damage in an experimental model of sepsis [44, 45]. Increased expression of miR-224-5p and reduced expression of miR-1-3p may regulate the inflammatory response in CVID related ImD. Bioinformatic analysis of deregulated miRNA in the CVIDC group compared to the CVIDInO group identified several putative gene targets such as NOTCH2, which is important for T cell responses [46], the PIK3CA, part of the PI3K signaling pathway [47], and the inflammatory caspase 3, a key protein in apoptosis and pyroptosis pathways [48]. In summary, deregulated miRNA in CVID may potentially modulate fundamental cellular processes and thereby influence CVID-related ImD.
MiRNA raw count means, significant fold change between the CVIDC- and CVIDInO groups, and putative involvement in IFN-γ signaling were factors considered in the selection of miRNAs for the validation assay with real-time PCR. Among the miRNAs in the validation assay, we found correlating levels of mir-103a-3p with mir-34a-5p and mir-301a-3p. In addition, both mir-103a-3p and mir-34a-5p correlated with inflammatory plasma proteins such as CXCL9, IL10, and IL12B. Protein–protein-interaction (PPI) network analysis indicated proteins regulating immune responses to be overrepresented in the mir-103a-3p cluster and the mir-34a-5p clusters. Experimental models have suggested that mir-103a-3p both promotes and ameliorates inflammatory responses [49, 50] and that this miRNA is upregulated in rheumatoid arthritis and connected to disease activity [51]. We found a negative correlation of mir-103a-3p with inflammatory proteins, which may be indicative of an anti-inflammatory activity in CVID. It is unlikely that mir-103a-3p specifically counteracts IFN-γ driven inflammation since plasma levels were similar in the two CVID groups. The net effect of mir-103a-3p in CVID remains to be determined.
Increased levels of mir-34a-5p have previously been reported in the whole blood of lung cancer patients [52] and in the plasma of people living with HIV, even after prolonged control of viral replication [53]. Functional in vitro studies have shown that mir-34a-5p modulates T cell signaling and the expression of IFN-γ induced CXCR3 ligands such as CXCL9, CXCL10, and CXCL11, which are chemoattractants for activated T cells; hence, mir-34a-5p may act as a major hub of T cell regulatory networks [5456]. These findings support a role for mir-34a-5p in the pathogenesis of CVID-related ImD, which is associated with upregulation of the Tbet-CXCR3-axis with increased numbers of T-helper 1 skewed T cells and increased IFN-γ-production [10, 32]. Moreover, PPI analysis of plasma proteins correlating with mir-34a-5p predicted the enrichment of factors involved in a chronic inflammatory response, and the highest levels of mir-34a-5p were found in CVIDC patients, which may also imply a role of mir-34a-5p in CVID related ImD. Among the predicted immune system process gene targets of mir-34a-5p, we analyzed the plasma levels of four gene products (CD40, CXCL9, IL10, and TNF). They were all increased in CVIDC patients compared to CVIDInO patients and this may reflect upregulated mir-34a-5p activity. CXCL9 and TNF are Th1 cytokines. Mir-34a-5p is considered a tumor suppressor acting by augmenting Th1 T cell responses and preventing cancer cell immune checkpoint upregulation and subsequent immune evasion [57, 58]. Hence, it can be hypothesized that mir-34a-5p contributes to the enhanced CD4 T cell differentiation in CVID-related ImD, which is supported by negative correlations of naïve CD4 T cells and mir-34a-5p levels in this study. If the significance of mir-34a-5p in CVID-related ImD can be verified in functional studies, blocking of mir-34a-5p may potentially be a new therapeutic approach to consider.
Our study has some limitations. First is the restricted number of patients included and their heterogeneity when it comes to the clinical manifestations of CVID. Despite this, we identified differences in miRNA profiles when comparing CVID patients with- and without severe ImD that predicted enrichment of target genes involved in IFN-γ signaling. Furthermore, the distribution of male vs female in the infection only group was highly skewed towards male, which is a limitation, but when exploring the whole cohort, we did not find any significant differences in dCq-levels of miRNAs between male and female participants, so it should have a limited impact on the study. Moreover, it is an explorative study, and the findings need to be validated by longitudinally analyzing a larger study cohort, and an alternative study design is required to dissect the potential mechanistic role of miRNAs in the development of CVID-related ImD.

Conclusions

In conclusion, we identified several circulating miRNAs that were associated with CVID-related ImD, which were predicted to target genes involved in IFN-γ-driven inflammation. Levels of mir-34a correlated with inflammatory factors and decreased numbers of naïve CD4 T cells. Collectively, our data show that miRNAs correlate with the inflammatory response in CVID and may help us understand the pathogenesis of CVID-related ImD. However, further studies are needed to elucidate the role of miRNAs in the development of CVID-related ImD.

Acknowledgements

We would especially like to acknowledge Ramona Fust (Department of Infectious Medicine Linköping University Hospital) for help with the patient samples. We further acknowledge the help of the staff at the flow cytometry unit at the Department of Clinical Immunology and Transfusion Medicine, Linköping University Hospital, for help with the sample collection, preparation, and analysis.

Declarations

Ethics Approval

This study was performed in line with the principles of the Declaration of Helsinki and was approved by Regional Ethics Committee of Linköping, Sweden (2017/214–32).
Informed consent was obtained from all individual participants included in the study.
The informed consent included consent for publication of data.

Competing Interests

The authors declare no competing interests.
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://​creativecommons.​org/​licenses/​by/​4.​0/​.

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Supplementary Information

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Metadaten
Titel
Plasma Levels of mir-34a-5p Correlate with Systemic Inflammation and Low Naïve CD4 T Cells in Common Variable Immunodeficiency
verfasst von
Sofia Nyström
Jonas Hultberg
Emelie Blixt
Åsa Nilsdotter-Augustinsson
Marie Larsson
Publikationsdatum
01.01.2024
Verlag
Springer US
Erschienen in
Journal of Clinical Immunology / Ausgabe 1/2024
Print ISSN: 0271-9142
Elektronische ISSN: 1573-2592
DOI
https://doi.org/10.1007/s10875-023-01618-0

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