Integrin and transcriptomic profiles identify a distinctive synovial CD8+ T cell subpopulation in spondyloarthritis. Issue 11 (November 2019)

• Record Type: Journal Article
• Authors: Qaiyum, Zoya; Gracey, Eric; Yao, YuChen; Inman, Robert D
• Is Part Of: Annals of the rheumatic diseases. Volume 78:Issue 11(2019)
• Page Start: 1566
• Publication Date: 2019-11
• Subjects: Ankylosing Spondylitis -- CyTOF -- RNA-seq -- integrins; Rheumatism -- Periodicals; 616.723005
• DOI: 10.1136/annrheumdis-2019-215349
• Languages: English
• ISSNs: 0003-4967

Abstract

Abstract : Objectives: Current evidence suggests that immune events in the gut may impact joint inflammation in ankylosing spondylitis (AS) but the expression of gut-related trafficking molecules in the inflammed joint is poorly characterised. We aimed to (1) assess differential expression patterns of trafficking molecules between patients and controls, (2) generate joint-specific cellular signatures and (3) obtain transcriptomic profiles of noteworthy cell subpopulations. Methods: Male subjects under 40 years of age fulfilling the mNY criteria were recruited. The following cells were surface stained using a 36-marker mass cytometry antibody panel: (1) peripheral blood mononuclear cells from AS patients, and healthy controls; (2) synovial fluid mononuclear cells from AS and rheumatoid arthritis (RA) patients. Additionally, RNA-seq was performed on CD8+ T cell subpopulations from the synovial fluid (SF). Results: Mature CD8+ T cells were enriched in AS SF, with a distinct pattern of integrin expression (β7, CD103, CD29 and CD49a). RNA-seq analysis of SF-derived CD103+CD49a+CD8+ T cells revealed elevated TNFAIP3, GZMB, PRF1 and IL-10 . Conclusions: We have identified a novel integrin-expressing mature CD8+ T cell population (CD49a+CD103+β7+CD29+) that appears to be more prevalent in AS SF than RA SF. These cells seem to possess dual cytotoxic and regulatory profiles which may play a role in AS pathogenesis.