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A time-course microarray data analysis reveals consistent dysregulated genes and upstream microRNAs in autoantibody-mediated arthritis

  • Xinwen Wang1,
  • Jie Bai1,
  • Zhen Jia2,
  • Yangjun Zhu1,
  • Jijun Liu1,
  • Kun Zhang1,
  • Dingjun Hao1 and
  • Lisong Heng1Email author
Journal of Orthopaedic Surgery and Research201712:186

https://doi.org/10.1186/s13018-017-0674-0

Received: 2 March 2017

Accepted: 3 November 2017

Published: 2 December 2017

Abstract

Background

The purpose of this study is to identify key genes and microRNAs (miRNAs) involved in autoantibody-mediated arthritis (AMA).

Methods

A time-course microarray data (ID: GSE27492) of peripheral blood leukocytes, ankle tissue, and synovial fluid from K/BxN mouse serum-transferred mice were downloaded from Gene Expression Omnibus. Those samples were collected at days 0, 1, 3, 7, 12, and 18 after serum injection. Limma of R was employed to identify differentially expressed genes (DEGs) in samples collected at days 1–18 compared with those collected at day 0. Consistent DEGs were obtained by taking the interaction of DEGs from different time points, followed by functional enrichment analysis. MiRNAs were screened out and constructed into regulatory network with DEGs using Cytoscape.

Results

In total, 17 consistent DEGs were obtained, including downregulated Ephx1 and upregulated AF251705, Adam8, Arg1, Basp1, Ccl2, Ccl7, Ccl9, Ccr2, Clec4a2, Clec4d, Cxcl1, Fabp5, Fcgr1, Gp49a, Il1rn, and Saa3. Those DEGs were associated with biological processes of immune response, inflammatory response, and defense response; chemokine signaling pathway; cytokine-cytokine receptor interaction; and NOD-like receptor signaling pathway. Additionally, 202 miRNAs were identified to have a regulatory effect on 9 of the 17 DEGs. Notably, miR-944, miR-374a, and miR374b were found to regulate the expression of Cxcl1, Ccl7, and Ccl2. Clec4d was targeted by 78 miRNAs.

Conclusions

Our study reveals that 17 DEGs and 202 miRNAs may be associated with autoimmune disorder in the progression of AMA, which could guide future researches.

Keywords

ArthritisDifferentially expressed genesMicroRNARegulatory network

Background

Rheumatoid arthritis (RA) is an autoimmune disease, which is characterized by inflammation of the joints and surrounding tissues and destruction of bone and cartilage [1]. Inflammatory response and immune response are found to play critical roles in the pathogenesis of RA [24]. Many cytokines have been implicated in the pathogenesis of arthritis, such as interleukin-1 (IL-1) [5], IL-6 [6], IL-18 [7], and CC motif chemokine ligand 13 [8]. Matrix metalloproteinases (MMPs) play key roles in the destructive process and thus are also implicated in arthritis [9], especially MMP-1 and MMP-13. Those uncovered genes demonstrate an involvement of the gene factor in the progression of arthritis.

Mouse models with autoantibody-mediated arthritis (AMA) are widely used in researches of arthritis [10]. The K/BxN mouse model of arthritis is a common AMA mouse model, in which the upstream adaptive immune response involved in generation of arthritogenic autoantibodies can be easily separated from the downstream autoantibody-mediated effector phase [10]. Using this model, previous studies have demonstrated the involvement of immune response in the incidence of AMA. It is reported that mast cells contribute to the initiation of AMA via IL-1 [11]. Monach et al. indicated that circulating C3 was necessary and sufficient for induction of AMA [12]. Neutrophils also take parts in the development of AMA [13]. Follicular dendritic cells (FDCs) are important for the induction of protective T cell-dependent humoral responses, and thus, they play critical roles in the initiation of AMA [14]. Thus, the K/BxN mouse serum transfer model could effectively help to reveal the underlying molecular mechanisms involved in the progression of AMA.

MicroRNAs (miRNAs) representing a family of non-coding RNAs are shown to play an essential regulatory effect on the innate immune system in rheumatic diseases [15]. MiRNA-30a-3p has a major regulatory role in regulating the autoimmune responses in arthritis by functioning as a basal repressor of tumor necrosis factor (ligand) superfamily, member 13b [16]. Inhibition of miR-155 can reversely increase the release of Src homology 2 domain-containing inositol 5-phosphatase 1 and thus suppress inflammatory response in arthritis patients [17]. MiRNA-22 exerts suppressive effect on cysteine-rich protein 61 expression which plays vital roles in mediating the joint inflammation and damage in arthritis [18]. Targeting the miRNAs associated with the progression of arthritis may serve as promising therapy strategies.

To systemically investigate the molecular mechanisms underlying AMA, the time-course gene expression profiles deposited by a previous study [10] were re-analyzed with bioinformatic tools. Consistent differentially expressed genes (DEGs) during the development of AMA in the K/BxN mouse serum transfer model were identified, followed by enrichment analysis of DEGs in an attempt to explore the molecular mechanisms. MiRNA-targeting DEGs were also predicted in order to provide an insight into the regulatory network of DEGs.

Methods

A time-course microarray data

Microarray data set GSE27492 deposited by Jacobs et al. [10] was downloaded from Gene Expression Omnibus, including 17 peripheral blood leukocytes samples, 19 ankle tissue samples, and 13 synovial fluid samples. Synovial fluid cells were collected from articular cavity of dissected ankles, and ankle tissue cells were from the dissected ankle joints. All the samples were collected from a mouse model of AMA at six time points after arthritis induction: day 0 (baseline), day 1 (preclinical), day 3 (disease onset), day 7 (early disease), day 12 (disease plateau), and day 18 (late disease). Notably, an autoimmune response can develop in K/BxN mice with the production of pathogenic anti-GPI antibodies which deposit on joint surfaces and induce arthritis [19]. Thus, AMA was induced in chemokine and chemokine receptor knockout mice on B6 background by intraperitoneal injection of 200 μL of K/BxN serum from 8-week-old K/BxN mouse, and the mouse model of AMA was established. Affymetrix Murine Genome U74A Version 2 Array was used to collect the gene expression profiles of RNA extracted from the three groups of samples.

Screening of differentially expressed genes

Raw data were processed through background correction and median normalization using robust multi-array average method [20] from package Bioconductor of R. For the several probes corresponding to a single gene, their expression levels were averaged as the final expression level for the gene. Differential expression analysis was performed with package limma [21]. |log FC (fold change)| > 1 and P value < 0.05 were set as the cut-offs to screen out DEGs. The expression levels of genes from samples collected at day 1, 3, 7, 12, and 18 were separately compared with those from samples collected at day 0. The consistent DEGs were obtained for further analysis by taking the intersection of the DEGs emerging at all of the five time points.

Functional enrichment analysis of the differentially expressed genes

To identify altered biological pathways in arthritis, Gene Ontology (GO) enrichment analysis [22] and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis [23] were carried out for the DEGs using hypergeometric test provided by DAVID (Database for Annotation, Visualization and Integration Discovery, http://david.abcc.ncifcrf.gov/) [24]. P value < 0.05 was chosen as the threshold to screen out significant GO terms and KEGG pathways.

Construction of regulatory network between microRNAs and differentially expressed genes

The miRNA-targeting DEGs were predicted based on 10 databases covering DIANA, MiRanda, MiRDB, MiRwalk, RNAhybrid, TargetScan, RNA22, PITA, PICTAR5, and PICTAR4. The predicted miRNAs from more than 5 of the 10 databases were identified as candidate miRNAs. Following, the regulatory network between miRNAs and DEGs was constructed using Cytoscape software [25].

Results

Identification of DEGs

Compared with the samples collected at day 0 after K/BxN serum injection, a total of 0, 35, 103, 62, and75 DEGs were separately obtained from the samples collected at day 1, 3, 7, 12, and 18. The Venn diagram of the DEGs from different time points was shown in Fig. 1. By taking the intersection of the DEGs from different time points, a total of 17 consistent DEGs were obtained, including downregulated Ephx1 (epoxide hydrolase 1, microsomal) and upregulated AF251705 (cDNA sequence AF251705), Adam8 (a disintegrin and metallopeptidase domain 8), Arg1 (arginase, liver), Basp1 (brain abundant, membrane attached signal protein 1), Ccl2 (chemokine (C-C motif) ligand 2), Ccl7 (chemokine (C-C motif) ligand 7), Ccl9 (chemokine (C-C motif) ligand 9), Ccr2 (chemokine (C-C motif) receptor 2), Clec4a2 (C-type lectin domain family 4, member a2), Clec4d (C-type lectin domain family 4, member d), Cxcl1 (chemokine (C-X-C motif) ligand 1), Fabp5 (fatty acid binding protein 5, epidermal), Fcgr1 (Fc receptor, IgG, high affinity), Gp49a (glycoprotein 49 A), Il1rn (interleukin 1 receptor antagonist), and Saa3 (serum amyloid A 3) (Table 1).
Fig. 1

The Venn diagram of the differentially expressed genes identified at various time points (days 3, 7, 12, and 18). Totally, 17 differentially expressed genes consistently appeared at each time point

Table 1

The FC magnitude of 17 consistent DEGs

Gene

Log2FC_3d

Log2FC_7d

Log2FC_12d

Log2FC_18d

AF251705

1.305238

1.457843

1.423637

1.534935

Adam8

1.397521

1.545198

1.64087

1.397731

Arg1

3.216408

3.470759

3.253301

3.500893

Basp1

1.183961

1.402966

1.330427

1.417313

Ccl2

3.136399

2.754264

2.608425

2.605791

Ccl7

2.379615

1.747449

1.676018

1.364921

Ccl9

1.592837

1.25133

1.348077

1.222959

Ccr2

1.395741

1.265384

1.07037

1.021065

Clec4a2

1.344762

1.371277

1.486593

1.286852

Clec4d

2.328534

3.102078

3.12611

3.014611

Cxcl1

1.152963

2.378911

2.050006

2.15751

Ephx1

− 1.12827

− 1.5318

− 1.36148

− 1.05361

Fabp5

1.300109

1.492187

1.360936

1.174031

Fcgr1

1.565833

1.337319

1.266228

1.255231

Gp49a

1.08629

1.48513

1.472467

1.684876

Il1rn

2.356432

2.933974

2.905693

3.029609

Saa3

2.536273

3.692907

3.451593

4.212274

FC fold change; DEGs differentially expressed genes. Gene names: AF251705 cDNA sequence AF251705; Adam8 a disintegrin and metallopeptidase domain 8; Arg1 arginase, liver; Basp1 brain abundant, membrane attached signal protein 1; Ccl2 chemokine (C-C motif) ligand 2; Ccl7 chemokine (C-C motif) ligand 7; Ccl9 chemokine (C-C motif) ligand 9; Ccr2 chemokine (C-C motif) receptor 2; Clec4a2 C-type lectin domain family 4, member a2; Clec4d C-type lectin domain family 4, member d; Cxcl1 chemokine (C-X-C motif) ligand 1; Ephx1 epoxide hydrolase 1, microsomal; Fabp5 fatty acid binding protein 5, epidermal; Fcgr1 Fc receptor, IgG, high affinity; Gp49a glycoprotein 49 A; Il1rn interleukin 1 receptor antagonist; Saa3 serum amyloid A 3

Functional enrichment analysis results

With the cut-off of P value < 0.05, totally 14 significantly enriched GO terms and 3 KEGG pathways were obtained (Table 2). GO enrichment analysis revealed the DEGs were related to biological processes of immune response, inflammatory response, and defense response (e.g., Cxcl1, Ccl2, Ccr2, Fcgr1, and Ccl7), molecular functions of chemokine activity, chemokine receptor binding, and cytokine activity (e.g., Cxcl1, Ccl2, Ccl9, and Ccl7), as well as cellular components of extracellular space and extracellular region part (e.g., Cxcl1, Ccl2, Ccl9, and Ccl7). KEGG pathway enrichment analysis uncovered the DEGs were associated with chemokine signaling pathway (Cxcl1, Ccl2, Ccr2, Ccl9, and Ccl7), cytokine-cytokine receptor interaction (Cxcl1, Ccl2, Ccr2, Ccl9, and Ccl7), and NOD-like receptor signaling pathway (Cxcl1, Ccl2, and Ccl7).
Table 2

The significantly enriched GO and KEGG terms of the 17 DEGs

Term

Number

P value

Gene lists

GO term

GO_BP: immune response

11

5.86E−12

Cxcl1, Ccl2, Gp49a, Ccr2, Il1rn, Ccl9, Clec4a2, AF251705, Clec4d, Fcgr1, Ccl7

GO_BP: response to wounding

7

1.09E−06

Cxcl1, Arg1, Ccl2, Ccr2, Saa3, Fcgr1, Ccl7

GO_BP: inflammatory response

6

3.12E−06

Cxcl1, Ccl2, Ccr2, Saa3, Fcgr1, Ccl7

GO_MF: chemokine activity

4

4.66E−06

Cxcl1, Ccl2, Ccl9, Ccl7

GO_MF: chemokine receptor binding

4

5.05E−06

Cxcl1, Ccl2, Ccl9, Ccl7

GO_CC: extracellular space

7

1.65E−05

Cxcl1, Arg1, Ccl2, Il1rn, Saa3, Ccl9, Ccl7

GO_BP: defense response

6

8.70E−05

Cxcl1, Ccl2, Ccr2, Saa3, Fcgr1, Ccl7

GO_CC: extracellular region part

7

1.70E−04

Cxcl1, Arg1, Ccl2, Il1rn, Saa3, Ccl9, Ccl7

GO_MF: cytokine activity

4

4.92E−04

Cxcl1, Ccl2, Ccl9, Ccl7

GO_BP: chemotaxis

3

6.25E−03

Ccl2, Ccl9, Ccl7

GO_BP: taxis

3

6.25E−03

Ccl2, Ccl9, Ccl7

GO_CC: extracellular region

7

9.88E−03

Cxcl1, Arg1, Ccl2, Il1rn, Saa3, Ccl9, Ccl7

GO_BP: locomotory behavior

3

2.78E−02

Ccl2, Ccl9, Ccl7

GO_MF: carbohydrate binding

3

3.20E−02

Clec4a2, Clec4d, Ccl7

KEGG pathway

mmu04062:chemokine signaling pathway

5

6.21E−05

Cxcl1, Ccl2, Ccr2, Ccl9, Ccl7

mmu04060:cytokine-cytokine receptor interaction

5

1.95E−04

Cxcl1, Ccl2, Ccr2, Ccl9, Ccl7

mmu04621:NOD-like receptor signaling pathway

3

3.08E−03

Cxcl1, Ccl2, Ccl7

GO Gene Ontology, KEGG Kyoto Encyclopedia of Genes and Genomes; DEGs differentially expressed genes; BP biological process; MF molecular function; CC cellular component. Gene names: AF251705 cDNA sequence AF251705; Arg1 arginase, liver; Ccl2 chemokine (C-C motif) ligand 2; Ccl7 chemokine (C-C motif) ligand 7; Ccl9 chemokine (C-C motif) ligand 9; Ccr2 chemokine (C-C motif) receptor 2; Clec4a2 C-type lectin domain family 4, member a2; Clec4d C-type lectin domain family 4, member d; Cxcl1 chemokine (C-X-C motif) ligand 1; Fcgr1 Fc receptor, IgG, high affinity; Gp49a glycoprotein 49 A; Il1rn interleukin 1 receptor antagonist; Saa3 serum amyloid A 3

Regulatory network between microRNAs and differentially expressed genes

Using the 10 databases for predicting miRNAs, 202 persuasive miRNAs were identified to have a regulatory effect on 9 of the 17 DEGs, including miR-155, miR-152, miR-124, miR-1, and miR-206 (Fig. 2). Importantly, according to the network, miR-944 was found to have a regulatory effect on the expression of Cxcl1 and Ccl7; miR-374a and miR374b both could regulate the expression of Ccl7 and Ccl2. Additionally, Clec4d was targeted by 78 miRNAs, suggesting an important role in the regulatory network.
Fig. 2

The regulatory network between 202 microRNAs and 9 differentially expressed genes. Circle represents microRNAs, and hexagon represents differentially expressed genes

Discussion

Focusing on screening molecular targets for AMA therapy, this study obtained 16 up-regulated and 1 downregulated genes in the mouse with AMA compared with the mouse without AMA by re-analyzing the time-course microarray data. Large troop of miRNAs was also screened to have a regulatory effect on 9 of the 17 DEGs based on the predictive databases. Enrichment analysis unmasked the potential molecular mechanisms by which the DEGs take part in the development of AMA.

Chemokines consisting of CXC, CC, C, and CX3C groups and their receptors are revealed to play key roles in leukocyte migration to inflamed synovium in the treatment of chronic inflammatory disorders of RA [26]. Accordingly, this study revealed a number of dysregulated chemokines and their receptors in the development of AMA, such as Adam8, Saa3, Il1rn, Ccl2, Ccl7, Ccl9, Ccr2, and Cxcl1. GO enrichment analysis revealed that immune response and inflammatory response were significantly enriched biological processes of DEGs, which were linked to RA and in line with previous studies [24, 27]. Those biological processes-associated genes, such as Cxcl1, Ccl2, Ccr2, Fcgr1, and Ccl7 were also associated with molecular functions of chemokine activity, chemokine receptor binding, and cytokine activity. Thus, a disorder of chemokine-associated functions was also observed in this study. In addition, Adam8 is detected under several pathological conditions and may be a potential drug target for the treatment of inflammatory diseases [28]. IL-33-induced neutrophil migration in RA is found to be dependent on Cxcl1, which may be a target of anti-TNF therapy [29]. CCR2 is regarded as a therapeutic target in RA treatment [30]. These findings suggest that some chemokines and receptors as therapeutic targets may have feasibility and application prospects in RA therapy. However, the CCR2 blockade cannot sufficiently induce clinical improvement in RA patients [31].The anti-CCL2 monoclonal antibody treatment also results in poor clinical improvement [32]. It could be inferred that the chronic inflammatory disorder may not only result from multiple dysregulated chemokines and receptors but also result from some other immune-associated genes; thus, targeting single molecule may not improve and cure the disease. Further studies are still needed to confirm the clinical feasibility and application prospects of these dysregulated chemokines and their receptors in RA therapy. Furthermore, as previously demonstrated, Fcgr1 makes a contribution to arthritis pathology [33]; Clec4a2 and Clec4d play essential roles in maintaining the homeostasis of immune system [34, 35]; Arg1 activity is important for wound healing functions and immune response to viral infections [36]. Therefore, the uncovered 17 dysregulated genes may jointly contribute to the chronic inflammatory disorder and need an integrated regulation.

Correspondingly, KEGG pathway enrichment analysis revealed the DEGs were associated with chemokine signaling pathway, cytokine-cytokine receptor interaction, and NOD-like receptor signaling pathway. Those pathways are closely related to inflammatory and immune responses. The upregulation of chemokine receptors Ccr1, Ccr2, and Ccr5 are associated with macrophage and endothelial cell infiltration in arthritis [37]. The cytokine-cytokine receptor interaction is also revealed to be implicated in the progression of RA [38]. The nucleotide-binding oligomerization domain (NOD)-like receptors are a class of specialized intracellular receptors implicated in the innate immune system [39]. The NOD2 signaling could be used as a therapeutic target for the control of RA [40]. Mesothelial cells involved in the inflammatory responses could secret chemokines Cxcl1 and Ccl2 by Nod1 stimulation [41]. Considering the possible role of these pathways in regulating inflammatory and immune response, these specific pathways may provide a new insight for therapeutics of other autoimmune disorders, such as periodental infection (bacterial), urinary tract infection (bacterial), and psoriatic arthropathy. More studies are still needed to confirm our speculation.

Furthermore, a large cohort of miRNAs was identified to be associated with the DEGs and the miRNAs were constructed into a regulatory network with DEGs. MiR-155, miR-152, and miR-124 have been shown to be implicated in RA [4244]. MiR-1 and miR-206 are also associated with inflammation [45]. They were all contained in our regulatory network, suggesting the reliability of our network to some extent. Additionally and importantly, based on the network, miR-944, miR-374a, and miR374b were revealed to have a regulatory effect on the expression of Cxcl1, Ccl2, and Ccl7. MiR-944 located in the intron of TP63 gene could promote cell proliferation, migration, and invasion in human cervical cancer [46]. MiR-374 experiences dysregulation in the inflammatory mice [47]. Although there are no direct links between those two miRNAs with immune systems, based on our results, miRNA-944 and miR-374 were predicted to be involved in the AMA via targeting Cxcl1, Ccl2, and Ccl7. Additionally, Clec4d was targeted by 78 miRNAs. Previous report has pointed out activated Clec4d can contribute to Mincel expression and thus enhance the immune system [35]. It could be therefore speculated that Clec4d may play a role in AMA as a downstream target of various miRNAs. Although the role of the above miRNAs and Clec4d in RA development has not been fully investigated, based on our results, we speculate that these molecules may serve as potential targets for RA treatment. All these speculations need further research. There were some limitations in our study. The comparative studies of other arthritis models were not included this study. Moreover, the results were obtained based on the bioinformatic methods and should be further confirmed by mechanistic experiments. Even so, this study reveals 17 DEGs associated with AMA, which may provide a theoretical basis for further studies.

Conclusion

Focusing on screening of therapeutic targets for AMA, this study reveals that 17 dysregulated genes may jointly and consistently play roles in the progression of AMA by affecting the immune system functions and pathways. MiR-944, miR-374a, and miR374b may be associated with AMA development by targeting some chemokines. Also, Clec4d probably mediates the functions of a large number of miRNAs in the development of AMA. Further experiments, both epidemiological and mechanical, should be performed to confirm the results.

Abbreviations

AMA: 

Autoantibody-mediated arthritis

DEGs: 

Differentially expressed genes

FDCs: 

Follicular dendritic cells

GO: 

Gene Ontology

KEGG: 

Kyoto Encyclopedia of Genes and Genomes

miRNAs: 

MicroRNAs

NOD: 

Nucleotide-binding oligomerization domain

RA: 

Rheumatoid arthritis

Declarations

Acknowledgements

None.

Funding

This work was supported by Science and Technology Project of Shaanxi Social Development (Project number: 2016SF-223).

Availability of data and materials

Microarray data set GSE27492 deposited by Jacobs et al. was downloaded from Gene Expression Omnibus.

Authors’ contributions

XW and LH participated in the conception and design of the research. JB, ZJ, and DH conceived of the data acquisition; YZ, JL, and DH participated in the analysis and interpretation of data. JB and KZ conceived of the statistical analysis. YZ obtained the funding. LH drafted the manuscript. XW conceived of the revision of the manuscript for important intellectual content. All authors read and approved the final manuscript.

Ethics approval and consent to participate

This article does not contain any studies with human participants or animals performed by any of the authors. The ethics approval is unnecessary for our study.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Authors’ Affiliations

(1)
Department of Orthopedics, Honghui Hospital, Xi’an Jiaotong University
(2)
Department of Endocrinology, Xi’an No. 1 Hospital

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