Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effects of Chitosan on the Production of Th1 and Th2 Cytokines in Mice

키토산이 Th1과 Th2 사이토카인 생성에 미치는 효과

  • Kim, Kwang-Hyuk (Department of Microbiology, Institute for Medicine, Kosin University College of Medicine)
  • 김광혁 (고신대학교 의과대학 의과학연구소, 미생물학교실)
  • Published : 2009.03.31
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Abstract

Chitosan is derived from chitin by a process of controlled deacetylation. In the present study, we investigated the effects of chitosan on the production of cytokines such as interleukin-2 (IL-2), interferon-$\gamma$ (IFN-$\gamma$), interleukin-4 (IL-4), and interleukin-10 (IL-10) in mice. The culture supernatants of splenocytes exposed with chitosan alone or chitosan plus cell stimulants, lipopolysaccharide (LPS), concanavalin A (Con A), and phytohemagglutinin-P (PHA-P) were harvested to assay IL-2, IFN-$\gamma$, IL-4, and IL-10 production. IL-2, IFN-$\gamma$, and IL-4 from splenocytes exposed to chitosan showed a greater increase compared to the PBS control group. IL-2 and IFN-$\gamma$ levels in the culture supernatants from splenocytes exposed to LPS+chitosan were higher than those of the groups exposed to LPS alone. IL-4 and IL-10 levels in the culture supernatants from splenocytes exposed to LPS+chitosan were lower than those of the groups exposed to LPS only. These findings demonstrate that chitosan upregulates the immune responses by Th1 cytokines (IL-2 and IFN-$\gamma$) and downregulates those by Th2 cytokines (IL-4 and IL-10) in LPS-associated immunity. These results show the potential of its usefulness for balancing the Th1/Th2 immune response, if more research results were accumulated.

본 연구에서는 키토산이 마우스에서 Th1과 Th2 사이토카인의 생성에 미치는 효과를 보기 위하여 키토산에 의한 IL-2 생성의 변화, 키토산에 의한 IFN-$\gamma$ 생성의 변화, 그리고 키토산에 의한 IL-4 생성의 변화, 키토산에 의한 IL-10 생성의 변화를 시험관내에서 시험하였다. 또한 LPS, Con A, PHA-P와 같은 세포자극물과 키토산이 함께 작용되었을 때 상기 사이토카인의 생성의 변화를 관찰하였다. 키토산을 비장세포에 노출시켰을 때 Th1 사이토카인인 IL-2와 IFN-$\gamma$의 생성이 크게 증가하였지만 고농도의 키토산에 의해서는 오히려 대조군에 비하여 감소하였다. LPS와 같은 세균독소, Con A와 같은 세포자극물을 비장세포에 노출시켰을 때 IL-2와 IFN-$\gamma$의 생성은 큰 상승을 나타냈으며 LPS의 경우 키토산에 의해서 IL-2와 IFN-$\gamma$의 생성이 증폭되었다. 키토산을 비장세포에 노출시켰을 때 Th2 사이토카인인 IL-4와 IL-10의 생성은 큰 증가를 보이지 않았다. LPS와 같은 세균독소에 의한 IL-4와 IL-10의 상승이 키토산에 의해서 억제되었다. 따라서 이러한 결과들로 부터 키토산이 LPS와 같은 세균독소가 존재하는 가운데 Th1 사이토카인을 증가시키고 Th2 사이토카인을 감소시킴에 따른 면역반응 환경이 이루어질 가능성이 높다 하겠다. 앞으로 키토산에 대한 더 많은 자료의 축적이 이루어지게 되면 임상에서 Th1/Th2 면역반응의 균형을 유지하는데 이용될 가능성도 있다 하겠다.

Keywords

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