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Genechip analysis of CD4+T cells

ABSTRACT: 【Objectives】The FPR2 is a G-protein coupled receptor that potently possesses pro- and anti-inflammatory role. Although FPR2 is known to be expressed by T cells, its function in arthritic condition is unclear. We investigated the involvement of FPR2 on T cells in GPI-induced arthritis (GIA) and rheumatoid arthritis (RA). 【Methods】Fluctuated expression of FPR2 mRNA on CD4+T cells was analyzed in GIA. We sorted FPR2+ or FPR2-CD4+T cells from arthritic lymph nodes, then the mRNA expression of various markers from CD4+T cell subsets was examined. Naïve T cells were cultured favoring Th1, Th2 and Th17 cell differentiation, then the expression of FPR2 was analyzed by FACS. In humans, the expression of FPR2 on CD4+T cells from healthy subjects (HS) or patients with RA was compared. 【Results】The expression of FPR2 in CD4+T cells was upregulated in the early phase of arthritis. FPR2+ T cells had higher expression of T-bet and IFNγ than FPR2-T cells. FPR2+ T cells were frequently detected on Th1 condition but not on Th2 and Th17. The expression of FPR2 on CD4+T cells was significantly higher in RA than in HS. 【Conclusion】We identified that FPR2+T cells showed Th1 phenotype in mice and this molecule was highly detected on CD4+T cells in patients with RA, suggesting FPR2+T cells might play a crucial role in RA.

ORGANISM(S): Mus musculus

PROVIDER: GSE66912 | GEO | 2015/03/17

SECONDARY ACCESSION(S): PRJNA278357

REPOSITORIES: GEO

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Project description:Background: Unbiased studies using different genome-wide methods have identified several promising novel biomarkers for diagnosis and treatment response in Rheumatoid Arthritis (RA). However, clinical translation has proven difficult. Here, we hypothesized that one reason could be that inflammatory responses in peripheral blood are different from those in the arthritic joint. Methods: We performed meta-analysis of gene expression microarray data from synovium, whole blood cells (WBC), peripheral blood mononuclear cells (PBMC), and CD4+ T cells from patients with RA and healthy control in order to identify overlapping pathways, predicted upstream regulators and potential biomarkers. We also analyzed single cell RNA-sequencing (scRNA-seq) data from peripheral blood and whole joints from a mouse model of antigen-induced arthritis. Results: Analyses of two profiling data sets from synovium from RA patients and healthy controls all showed significant activation of pathways of known pathogenic relevance, such as Th1 pathway, role of NFAT in regulation of the immune response, dendritic cell maturation, iCOS-iCOSL signaling in T helper cells, Fc? receptor-mediated phagocytosis, interferon signaling, Cdc42 signaling, and cytotoxic T lymphocyte-mediated apoptosis. The most activated upstream regulators included TNF, an important drug target, as well as IFN-gamma and CD40LG, all of which are known to play important pathogenic roles in RA. The differentially expressed genes from synovium included several potential biomarkers, such as CCL5, CCL13, CCL18, CX3CL1, CXCL6, CXCL9, CXCL10, CXCL13, IL15, IL32, IL1RN, SPP1, and TNFSF11. By contrast, microarray studies of WBC, PBMC and CD4 + T cells showed variable pathways and limited pathway overlap with synovium. Similarly, scRNA-seq data from a mouse model of arthritis did not support that inflammatory responses in peripheral blood reflect those in the arthritic joints. These data showed pathway overlap between mouse joint cells and synovium from patients with RA, but not with cells in peripheral blood. Conclusions: Our findings indicate a dichotomy between gene expression changes, pathways, upstream regulators and biomarkers in synovium and cell types in peripheral blood, which complicates identification of biomarkers in blood.

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Genechip analysis of CD4+T cells

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