Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Immune System-Stimulating Activities of Mucilage Polysaccharides Isolated from Opuntia humifusa

천년초에서 분리한 점질다당의 면역자극 활성

  • Seo, Yi-Seul (Dept. of Food Science and Biotechnology, Kyonggi University) ;
  • Shin, Kwang-Soon (Dept. of Food Science and Biotechnology, Kyonggi University)
  • 서이슬 (경기대학교 식품생물공학과) ;
  • 신광순 (경기대학교 식품생물공학과)
  • Received : 2011.11.10
  • Accepted : 2011.11.21
  • Published : 2012.01.31
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Abstract

To examine the new practical utilization of mucilages in Opuntia humifusa, the Korean pear cactus, the polysaccharides were isolated from O. humifusa, and immuno-stimulating activities were assayed. The main polysaccharide, CNC-E, was prepared by a commercial enzyme treatment, water extraction, and ethanol precipitation. The molecular mass of CNC-E was estimated to be about 700 kDa, and it consisted mainly of arabinose, galactose and xylose in addition to two minor sugars such as rhamnose and fucose. On the other hand, CNC-E showed considerably high splenocyte proliferation activity in a dose-dependent manner. Peritoneal macrophages stimulated with CNC-E produced cytokines such as IL-6, IL-12, IL-10, and TNF-${\alpha}$. The intravenous administration of CNC-E significantly augmented the cytotoxicity of natural killer (NK) cells against Yac-1 tumor cells. Especially, NK cells obtained from the mice treated with $100{\mu}g$ of CNC-E showed threefold higher cytolytic activity than those of untreated mice. CNC-E also showed potent anti-complementary activity in a dose-dependent fashion. Identification of C3 activation products by the crossed immunoelectrophoresis using anti-human C3 and the anti-complementary activity of CNC-E in a $Ca^{2+}$-free condition suggested complement activations by CNC-E that occur via both alternative and classical pathways. These results indicate that Korean pear cactus contains selected polysaccharides that provide immuno-stimulating activities beneficial to human health.

천년초(Opuntia humifusa)에 존재하는 점질다당의 새로운 이용방안을 모색하기 위해 천년초로부터 다당을 분리하여 면역자극활성을 측정하였다. 천년초의 주요 다당 CNC-E는 상업용 효소처리, 물 추출 및 ethanol 침전을 거쳐 조제하고 이들의 특성을 검토하였다. CNC-E는 분자량 약 700 kDa의 다당체로, 구성당 조성을 확인한 결과, arabinose, galactose 및 xylose를 높은 비율로 함유하고 있었으며 rhamnose와 fucose를 미량 함유하고 있었다. 한편 CNC-E는 비장세포 유래 림프구에 대해서는 비교적 높은 증식활성을 농도 의존적으로 나타냈다. CNC-E로 자극한 macrophage는 IL-6, IL-12, IL-10 및 TNF-${\alpha}$와 같은 cytokine의 생산을 농도 의존적으로 증진시켰으며 CNC-E를 mouse에 정맥 주사한 후 얻어진 NK세포는 Yac-1 종양 세포주에 대한 높은 치사작용을 보였다. 특히 CNC-E를 mouse 당 $100{\mu}g$ 처리한 후 얻어진 NK세포는 미처리 대조군에 비해 3배 높은 치사활성을 나타냈다. CNC-E는 인체 초기 면역반응에 있어 중요한 역할을 담당하는 보체계에 대하여 농도 의존적인 활성을 나타냈으며, anti-human C3를 이용한 면역전기영동실험과 $Ca^{2+}$이온이 제거된 상태에서의 항보체 활성 실험을 통해 천년초 다당 CNC-E는 고전경로와 부경로를 모두 경유하여 활성을 나타내고 있음을 확인하였다. 이상의 결과로부터 한국산 선인장 천년초에는 인체에 유익한 면역 활성 다당체를 다량 함유함을 알 수 있었다.

Keywords

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