생명과학회지 (Journal of Life Science)

  • 제17권1호
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  • Pages.31-38
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  • 2007
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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Salmonella typhimurium lipid A를 처리한 식세포 존재 조건에서 mitogen에 유도되는 이자 세포의 증식억제

Lipid A of Salmonella typhimurium Suppressed T-cell Mitogen-Induced Proliferation of Murine spleen Cells in the Presence of Macrophage

  • Kang, Gyong-Suk (Department of Family Medicine, Daehan-Wellness Hospital) ;
  • Chung, Kyung-Tae (Department of Life Science and Biotechnology, Dong-Eui University)
  • 발행 : 2007.01.29
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초록

사람의 장티푸스 연구는 생쥐에 감염되는 Salmonella typhimurium를 모델로 연구되고 있으며, 생쥐에 있어서 S. typhimurium의 감염은 이자세포의 증식반응을 감소시키는 것으로 알려져 있다. S. typhimurium lipid A의 처리가 T세포 mitogen에 의한 이자 세포의 증식에 어떤 영향을 주는 가를 in vitro와 ex vivo조건에서 알아 보았다. Lipid A 단독 처리는 이자 세포의 증식을 보였으나, lipid A 처리 후 T 세포 mitogen인 concanavalin A (Con A)와 phytohemagglutinin (PHA)에 의한 in vitro와 ex vivo 조건에서의 이차 처리는 오히려 세포증식이 억제되었다. Lipid A를 주사한 생쥐로부터 분리한 이자 세포에서 대식세포를 제거하였을 조건에서는 T 세포 mitogen에 의한 증식 효과가 유지되었으나 대식세포를 제거하지 않았을 경우에는 T세포 mitogen에 의한 증식 효과가 억제되었다. Lipid A를 주사한 생쥐에서 얻은 대식세포를 포함한 이자세포의 숫자를 증가하면서 Lipid A를 주사하지 않은 생쥐에서 얻은 이자세포와 혼합 배양하였을 때 Lipid A를 주사한 생쥐에서 얻은 대식세포를 포함한 이자세포의 숫자가 높을수록 Con A와 PHA에 의한 증식억제가 높게 측정되었다. 이러한 결과는 Con A와 PHA의 이자세포 증식 기능이 lipid A의 전처리에 의해 활성화된 대식세포의 직접적인 접촉 작용으로 억제된 것으로 생각된다. 본 연구의 결과를 바탕으로 억제에 관여하는 대식세포 표면분자를 밝히는 것이 사람의 장티푸스 연구에 도움이 되리라 생각된다.

Infection with virulent or attenuated Salmonella typhimuriumhas known to induce reduction in proliferative responses of spleen cells. We investigated a role of lipid A from S. typhimurium, a B cell mitogen, on proliferation of spleen cells by T cell mitogens such as concanavaline A and phytohemagglutinin under in vitro and ex vivo conditions. Lipid A alone induced proliferation of spleen cells in vitroin a dose-dependent manner. However, subsequent treatment of concanavaline A or phytohemagglutin in after lipid A treatment induced proliferation suppression of murine spleen cells in vitro and ex vivo. Removal of macrophages from spleen cells, which were obtained from a lipid A-injected mouse, restored proliferation by concanavaline A and phytohemagglutinin, indicating that macrophages appeared to play a role in lipid A-induced suppression. Secreted molecules from macrophages did not accounted for the suppression because suppressive effect was not achieved when the supernatant from macrophage-containing spleen cell culture was conditoned to macrophage-depleted spleen cell culture. Co-culture of spleen cells from lipid A-treated and - untreated mice showed proliferation suppression as increasing cell numbers of lipid A-treated mouse. These data suggested that the cell-to-cell contact of macrophage with splenic lymphocyte cells is responsible for immune responses against lipid A, which is applicable to the case of human S. typhi infection.

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