Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Isolation and Immunomodulating Activity of an Extracellular Polysaccharide Produced by Bacillus sp. PS-12

Bacillus sp. PS-12가 생산하는 extracellular polysaccharide의 분리 및 immunomodulating activity

  • Na, Ye-Seul (Department. of Biotechnology and Biomaterial Engineering Research Center, Catholic University) ;
  • Suh, Hyun-Hyo (Department. of Environmental Engineering, Jiinju National University)
  • 나예슬 (가톨릭대학교 생명공학과) ;
  • 서현효 (국립진주산업대학교 환경공학과)
  • Published : 2009.06.30
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Abstract

A bacterial strain producing highly viscous extracellular polysaccharide was isolated from soil. Through morphological, physiological and chemotaxonomical studies, it was identified as a Bacillus sp. and named Bacillus sp. PS-12. The extracellular polysaccharide, named PS-12 was purified by ethanol precipitation, cetylpyridinium chloride (CPC) precipitation and gel permeation chromatography. The purified polysaccharide was found to consist of glucose, mannose, galactose, and fucose, with a molar ratio of approximately 7:3.2:2:1, respectively. PS-12 was investigated for its immunostimulating activity on murine macrophage RAW264.7 cells using an ELISA assay. PS-12 stimulated the production of TNF-${\alpha}$ to a level 50 times greater than the control and also induced 1L-6 secretion in a dose-dependent manner. The cytotoxicity on RAW264.7 cells by PS-12 was relatively low with 10% cytotoxicity at 2 ${\mu}g$/ml. These results indicate that PS-12 is less cytotoxic to immune cells and possess immunomodulating activity in which it can produce cytokines including TNF-${\alpha}$ and 1L-6 from macrophages.

토양에서 분리한 세포외 다당류 생산균주 PS-12는 형태학적, 생리학적, 화학적 분석에 의하여 Bacillus sp.에 속하는 균주로 동정되었으며, 분리균주 PS-12는 Bacillus sp. PS-12로 명명하였다. Bacillus sp. PS-127가 생산하는 세포외 다당류는 에탄올 침전, cetylpyridinium chloride (CPC) 침전과 gel permeation chromatography를 이용하여 정제하였으며, 정제된 다당류 PS-12의 당조성은 glucose, mannose, galactose와 fucose가 7:3.2:2:1의 몰비로 구성되어있었다. Bacillus sp. PS-12로부터 분리된 다당류 PS-12를 이용하여 면역증강효과를 확인하였다. TNF-${\alpha}$ 및 lL-6 측정은 RAW264.7 대식세포주를 사용하였으며 cytokine 정량을 위하여 ELISA kit를 이용하였다. RAW264.7 세포주에 대한 PS-12의 세포독성을 확인하기 위하여 세포독성이 10% 미만을 나타내는 농도인 2 ${\mu}g$/ml을 PS-12의 최대농도로 측정하였다. PS-12는 ${\mu}g$/ml에서 TNF-${\alpha}$를 정상세포보다 50배 이상 높은 수치로 생산하였다. 또한 lL-6의 생산을 농도 의존적으로 증가시켰다. 이러한 결과로부터 PS-127가 면역세포에 대해 세포독성을 거의 나타내지 않는 농도에서 대식세포로부터 TNF-${\alpha}$와 11-6의 cytokine 생산을 함으로써 면역증강효과를 나타낸다는 것을 확인하였다.

Keywords

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