Role of T lymphocytes in ischemic brain injury

Takashi Shichita, Fumie Konoeda, Akihiko Yoshimura

研究成果: Article査読

2 被引用数 (Scopus)


Recently, inflammation has been implicated in the progression of cerebral ischemic injury. Especially, T lymphocytes have been shown to infiltrate into the ischemic brain 24 hours after the onset, however, the function and specific subpopulation of these infiltrated T lymphocytes have not been fully understood. By using cytokine-deficient mice with transient focal ischemia model, we have shown that IL-23 and IL-17 but not IL-6 or IFN-γ play pivotal roles in the ischemic brain injury. We found that IL-23, which was mainly produced from infiltrated macrophages, induced IL-17-producing T lymphocytes in the ischemic brain. IL-23 and IL-17 expression increased 1 day or 3 day after ischemic injury, respectively, and promoted inflammatory responses by increasing the expression of neurotoxic factors. To our surprise, IL-17 was mainly produced by γδT lymphocytes, but not helper T cells. Based on these findings, we have tried to develop new therapeutic strategy for the progression of brain infarction. We found that administration of FTY720 (Fingolimod) and antibody against γδT lymphocytes attenuated ischemic brain damage. Furthermore, antibody against p40 which neutralizes both IL-23 and IL-12 simultaneously was also effective. Therefore, anti-cytokine therapy will be applicable for neuroprotection in the delayed phase of brain ischemia.

ジャーナルClinical Neurology
出版ステータスPublished - 2010

ASJC Scopus subject areas

  • 臨床神経学


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