생명과학회지 (Journal of Life Science)

  • 제21권2호
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  • Pages.316-321
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  • 2011
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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트립토판 대사체 3-hydroxyanthranilic acid의 TRAIL-유도 활성 T 세포 사멸 효과

Tryptophan Metabolite 3-Hydroxyanthranilic Acid Augments TRAIL-Induced Apoptosis in Activated T Cells

  • 서수길 (인제대학교 의과대학 미생물학교실)
  • Seo, Su-Kil (Department of Microbiology and Immunology, College of Medicine, Inje University)
  • 투고 : 2011.01.19
  • 심사 : 2011.02.21
  • 발행 : 2011.02.28
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초록

Indoleamine 2,3-dioxygenase (IDO)에 의한 트립토판 대사체의 생성은 T 세포에 강력한 억제효과를 미치지만 여전히 그 작용기전에 대한 연구보고는 미비한 실정이다. 본 연구자는 트립토판 대사체 3-HAA가 선택적으로 활성 T 세포의 사멸을 촉진시키는 효과가 있음을 확인하였고, 이는 세포주기 억제와는 관련이 없었다. 3-HAA 처리 시 활성 T 세포에서 TRAIL과 그의 수용체의 발현이 현저히 증가하고, 이들 상호작용을 차단하였을 때 3-HAA-매개 활성 T 세포사멸 효과가 유의하게 낮아졌다. 본 연구를 통해 트립토판 대사체 3-HAA의 선택적 T 세포 억제 효과가 TRAIL-유도 세포사멸과 관련됨을 알 수 있다.

Generation of tryptophan-derived metabolites by indoleamine 2,3-dioxygenase (IDO) is a potent immunoregulatory mechanism in T cell responses. However, the mechanism remains unclear. We showed that 3-hydroxyanthranilic acid (3-HAA), the most potent metabolite, selectively induced apoptosis in activated T cells, but not in resting T cells. This was not associated with cell cycle arrest. We found that TRAIL expression was selectively induced in activated T cells by treatment of 3-HAA. Blockade of the TRAIL: DR4/DR5 pathway significantly inhibited 3-HAA-mediated T cell death. Our data suggest that TRAIL-induced apoptosis is involved in the mechanism of 3-HAA-mediated T cell death.

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