Poly-γ-glutamic acid suppresses osteoclastogenesis in human osteoclast precursors and prevents joint damage in a collagen-induced murine arthritis model

Bitnara Lee, Sungsin Jo, Sung Min Kim, Mi La Cho, Sung Hwan Park, Jeehee Youn, Jong Dae Ji, Tae Hwan Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)


Poly–γ-glutamic acid (γ-PGA), a natural polymer derived from Bacillus subtilis, shows anti-inflammatory activity. However, the effects of γ-PGA on osteoclasts, which are important cells for joint destruction in inflammatory diseases such as rheumatoid arthritis (RA), have not yet been reported. In this study, we show that γ-PGA markedly inhibits osteoclast differentiation in normal PBMC-derived osteoclast precursors and in synovial fluid macrophages of patients with RA. γ-PGA also reduces RANK expression by down-regulating M-CSF receptors. Additionally, oral administration of γ-PGA attenuated bone destruction in a collagen-induced arthritis (CIA) model, demonstrating decreases in inflammation, cartilage damage, and osteoclast formation in histological analyses. Taken together, these data suggest that γ-PGA could be a good candidate for therapeutic prevention of joint destruction in RA.

Original languageEnglish
Pages (from-to)80-86
Number of pages7
JournalImmunology Letters
Publication statusPublished - 2018 Nov 1



  • Osteoclast
  • Poly-γ-glutamic acid (γ -PGA)
  • Rheumatoid arthritis

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

Cite this