IL-9, a local growth factor for synovial T cells in inflammatory arthritis

Smriti Kundu-Raychaudhuri, Christine Abria, Siba P Raychaudhuri

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Objective: The regulatory role of the Th9 cells along with its signature cytokine IL-9 in human immune system and its aberrant activation in autoimmune diseases is currently under investigation. We are reporting the functional significance of IL-9 in the pathogenesis of autoimmune inflammatory arthritis. Methods: CD3+ T cells were obtained from peripheral blood (PB) and synovial fluid (SF) of psoriatic arthritis (PsA), rheumatoid arthritis (RA), and osteoarthritis (OA) patients. MTT, FACS based CFSE dilution assay and apoptosis assay (Annexin-V) were performed to determine the pro-growth/survival effect of human recombinant IL-9 on activated CD3+ T cells. Immunoblots were performed to determine the signaling proteins responsible for the progrowth/survival effect of IL-9. Results: SF of PsA and RA was enriched with IL-9 producing CD3+ T cells compared to the SF in OA. IL-9 level measured by ELISA was significantly elevated in PsA and RA patients compared to SF in OA (+ T cells of PB and SF of PsA and RA and compared to untreated (media) controls (p

Original languageEnglish (US)
Pages (from-to)45-51
Number of pages7
StatePublished - Mar 1 2016


  • Autoimmune inflammatory arthritis/RA/PsA
  • IL-9
  • PI3K/Akt/mTOR kinase signaling cascade
  • Pro-growth/survival factor
  • T9 cell

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy
  • Hematology
  • Biochemistry
  • Molecular Biology


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