IL-17 inhibits chondrogenic differentiation of human mesenchymal stem cells

Masahiro Kondo, Kunihiro Yamaoka, Koshiro Sonomoto, Shunsuke Fukuyo, Koichi Oshita, Yosuke Okada, Yoshiya Tanaka

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


Objective: Mesenchymal stem cells (MSCs) can differentiate into cells of mesenchymal lineages, such as osteoblasts and chondrocytes. Here we investigated the effects of IL-17, a key cytokine in chronic inflammation, on chondrogenic differentiation of human MSCs. Methods: Human bone marrow MSCs were pellet cultured in chondrogenic induction medium containing TGF-b3. Chondrogenic differentiation was detected by cartilage matrix accumulation and chondrogenic marker gene expression. Results: Over-expression of cartilage matrix and chondrogenic marker genes was noted in chondrogenic cultures, but was inhibited by IL-17 in a dose-dependent manner. Expression and phosphorylation of SOX9, the master transcription factor for chondrogenesis, were induced within 2 days and phosphorylated SOX9 was stably maintained until day 21. IL-17 did not alter total SOX9 expression, but significantly suppressed SOX9 phosphorylation in a dose-dependent manner. At day 7, IL-17 also suppressed the activity of cAMP-dependent protein kinase A (PKA), which is known to phosphorylate SOX9. H89, a selective PKA inhibitor, also suppressed SOX9 phosphorylation, expression of chondrogenic markers and cartilage matrix, and also decreased chondrogenesis. Conclusions: IL-17 inhibited chondrogenesis of human MSCs through the suppression of PKA activity and SOX9 phosphorylation. These results suggest that chondrogenic differentiation of MSCs can be inhibited by a mechanism triggered by IL-17 under chronic inflammation.

Original languageEnglish
Article numbere79463
JournalPloS one
Issue number11
Publication statusPublished - 2013 Nov 15
Externally publishedYes

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences
  • General


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