Time-dependent changes in proinflammatory and neurotrophic responses of microglia and astrocytes in a rat model of osmotic demyelination syndrome

Shintaro Iwama, Yoshihisa Sugimura, Haruyuki Suzuki, Hiromi Suzuki, Takashi Murase, Nobuaki Ozaki, Hiroshi Nagasaki, Hiroshi Arima, Yoshiharu Murata, Makoto Sawada, Yutaka Oiso

研究成果: ジャーナルへの寄稿学術論文査読

40 被引用数 (Scopus)

抄録

Osmotic demyelination syndrome (ODS) is a serious demyelinating disease in the central nervous system usually caused by rapid correction of hyponatremia. In an animal model of ODS, we previously reported microglial accumulation expressing proinflammatory cytokines. Microglia and astrocytes secreting proinflammatory cytokines and neurotrophic factors are reported to be involved in the pathogenesis of demyelinative diseases. Therefore, to clarify the role of microglial and astrocytic function in ODS, we examined the time-dependent changes in distribution, morphology, proliferation, and mRNA/protein expression of proinflammatory cytokines, neurotrophic factors, and matrix metalloproteinase (MMP) in microglia and astrocytes 2 days (early phase) and 5 days (late phase) after the rapid correction of hyponatremia in ODS rats. The number of microglia time dependently increased at demyelinative lesion sites, proliferated, and expressed tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, inducible nitric oxide synthase, and MMP2, 9, and 12 at the early phase. Microglia also expressed leukemia inhibitory factor (a neurotrophic factor) and phagocytosed myelin debris at the late phase. The number of astrocytes time dependently increased around demyelinative lesions, extended processes to lesions, proliferated, and expressed nerve growth factor and glial cell line-derived neurotrophic factor at the late phase. Moreover, treatment with infliximab, a monoclonal antibody against TNF-α, significantly attenuated neurological impairments. Our results suggest that the role of microglia in ODS is time dependently shifted from detrimental to protective and that astrocytes play a protective role at the late phase. Modulation of excessive proinflammatory responses in microglia during the early phase after rapid correction may represent a therapeutic target for ODS.

本文言語英語
ページ(範囲)452-462
ページ数11
ジャーナルGLIA
59
3
DOI
出版ステータス出版済み - 03-2011
外部発表はい

All Science Journal Classification (ASJC) codes

  • 神経学
  • 細胞および分子神経科学

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