Suppressing effect of low-dose gamma-ray irradiation on collagen-induced arthritis

Hiroko Nakatsukasa, Mitsutoshi Tsukimoto, Yasuhiro Ohshima, Fumitoshi Tago, Ayako Masada, Shuji Kojima

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We previously reported attenuation of autoimmune disease by low-dose gamma-ray irradiation in MRL-lpr/lpr mice. Here, we studied the effect of low-dose gamma-ray irradiation on collagen-induced arthritis (CIA) in DBA/1J mice. Mice were immunized with type II collagen, and exposed to low-dose gamma-rays (0.5 Gy per week for 5 weeks). Paw swelling, redness, and bone degradation were suppressed by irradiation, which also delayed the onset of pathological change and reduced the severity of the arthritis. Production of tumor necrosis factor-alpha, interferon-gamma, and interleukin-6, which play important roles in the onset of CIA, was suppressed by the irradiation. The level of anti-type II collagen antibody, which is essential for the onset of CIA, was also lower in irradiated CIA mice. The population of plasma cells was increased in CIA mice, but irradiation blocked this increase. Since regulatory T cells are known to be involved in suppression of autoimmune disease, the population of CD4+CD25+Foxp3+ regulatory T cells was measured. Intriguingly, a significant increase of these regulatory T cells was found in irradiated CIA mice. Overall, our data suggest that low-dose gamma-ray irradiation could attenuate CIA through suppression of pro-inflammatory cytokines and autoantibody production, and induction of regulatory T cells.

Original languageEnglish
Pages (from-to)381-389
Number of pages9
JournalJournal of radiation research
Volume49
Issue number4
DOIs
Publication statusPublished - 2008 Jul 28
Externally publishedYes

Keywords

  • Autoimmune disease
  • Collagen-induced arthritis
  • Low-dose irradiation
  • Regulatory T cells

ASJC Scopus subject areas

  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Health, Toxicology and Mutagenesis

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