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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effects of Various Chitosan Oligomer Molecular Weight Levels on the Disorders of Lipid Metabolism and Immune-related Factors in Rats Treated 2,3,7,8-Tetrachlorodibenzo-p-dioxin

다이옥신계 TCDD(2,3,7,8-Tetrachlorodibenzo-p-dioxin)에 노출된 흰쥐의 지질대사 및 면역관련 인자에 대하여 키토산 올리고머의 분자량별 섭취효과

  • Lee, Joon-Ho (Dept. of Consumers' Life Information, Chungnam National University) ;
  • Hwang, Seok-Youn (Dept. of Biomedical Laboratory Science, Daejeon University) ;
  • Lim, Beong-Ou (Dept. of Life Science, Konkuk University) ;
  • Lee, Yeon-Sook (Dept. of Food and Nutrition, Seoul National University)
  • 이준호 (충남대학교 생활과학대학 소비자생활정보학과) ;
  • 황석연 (대전대학교 자연과학대학 임상병리학과) ;
  • 임병우 (건국대학교 의료생명대학 생명과학부 응용생화학전공) ;
  • 이연숙 (서울대학교 생활과학대학 식품영양학과)
  • Received : 2011.10.21
  • Accepted : 2012.03.26
  • Published : 2012.04.30
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Abstract

This study was conducted to investigate the effects of various levels of chitosan oligomer (CO) molecular weight on the disorders of lipid metabolism and immune-related factors induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), that is a endocrine disrupter, using adult male rats (SD) for 3 weeks. These 40 animals were divided into five groups. Three kinds of CO were used by molecular weight (MW) (less than 1000, 1000~3000, and 5000~10000) and added 4% to basal diets respectively. TCDD (40 ${\mu}g$/kg B.W) was intraperitoneally injected into rats at the beginning of the experiment. The relative weights of the livers were increased in all rats treated with TCDD, and the brain and testis weights were increased in all CO diet groups, compared to the control and TCDD groups. The levels of white blood cells (WBC) and red blood cells (RBC), hemoglobin, hematocrits (HCT), and platelets were significantly lowered by treating TCDD. By the way, RBC and HCT tended to recover by CO diets. The elevation of serum total and HDL cholesterol levels induced by TCDD treatment was significantly reduced by CO (5000~10000 MW) diets. The apparent increasing of the total lipid, cholesterol, and triglyceride levels of rat livers induced by TCDD was tended to be suppressed in those fed CO diets. Especially, diets with less than 1000 MW significantly diminished liver triglycerides. The levels of serum immunoglobulin (Ig) A, IgG1 and IgM were significantly high in rats fed CO (5000~10000 MW) diets. The decreasing levels of IgE by treatment with TCDD tended to recover all the CO diet groups to the level of control group. In histochemical observation, the fat droplets and apoptosis of liver due to TCDD treatment were markedly alleviated in all CO diet groups. These results indicated that CO, though not regular according to molecular weight, can exert improving effects on lipid accumulation, hepatocytic disorders, abnormal blood cells, and some immunoglobulins induced by TCDD.

다이옥신계 TCDD에 노출된 흰쥐의 지질대사 및 면역관련 인자에 대하여 키토산 올리고머의 분자량에 따른 섭취효과를 알아보기 위해 Sprague-Dawley rat(수컷, 6주령)를 이용하여 TCDD를 40 ${\mu}g$/kg BW로 복강 내 주입하고 키토산 올리고머 분자량을 1000 이하, 1000~3000 및 5000~10000으로 수준을 달리하여 4% 첨가하고 3주간 실험하였다. 실험동물의 장기의 무게에서 간의 상대중량은 TCDD 투여군에서 모두 유의적으로 높았다. 뇌와 고환의 상대중량은 대조군과 TCDD 투여군에 비하여 TCDD 투여와 함께 키토산 올리고머를 섭취한 군에서 모두 현저히 증가하였다. 흉선의 상대중량은 대조군에 비하여 TCDD 투여군에서 모두 약 1/4 정도로 감소되었다. 혈액성분에서 적혈구의 수는 TCDD 투여에 의한 감소가 TCDD 투여와 함께 키토산 올리고머를 섭취한 군 모두에서 대조군 수준으로 증가되었고, 백혈구의 수와 헤모글로빈 및 헤마토크리트값은 TCDD 투여에 의한 감소가 TCDD 투여와 함께 키토산 올리고머의 분자량이 1000 이하인 것(COST)과 5000~10000인 것을 섭취한 군(COLT)에서 회복되는 경향을 보였다. 간 기능에 지표가 되는 효소인 혈청 GOT와 ALP는 대조군에 비하여 TCDD 투여군 모두에서 높은 경향을 보였다. 혈청 총콜레스테롤 및 HDL-콜레스테롤함량은 TCDD 투여에 의한 증가가 TCDD 투여와 함께 키토산 올리고머 분자량이 5000~10000인 것을 섭취한 군(COLT)에서 유의적으로 감소되어 콜레스테롤 억제효과가 나타났다. 간 지질에서는 총 지질과 콜레스테롤 및 중성지방이 유사한 경향으로 대조군에 비하여 TCDD 단독투여군에서 현저한 증가를 보여 지질축적이 되었는데 TCDD 투여와 함께 키토산 올리고머를 섭취한 군들에서 현저한 지질 억제효과를 내었다. 특히 TCDD투여와 함께 분자량 1000 이하의 키토산 올리고머를 섭취한 군(COST)이 TCDD 단독 투여 군에 비하여 간 콜레스테롤을 2/3 정도로, 간 중성지방을 1/2 정도로 뚜렷이 억제하였다. 변 중의 총 지질과 콜레스테롤함량은 TCDD 투여로 증가되는 경향이었고 TCDD 투여와 함께 키토산 올리고머 첨가한 군들에서는 TCDD군보다 대체로 낮은 경향이었다. 담즙산 배설은 대조군에 비하여 TCDD 투여군 모두에서 현저하게 낮았다. 간의 현미경적 관찰에서는 TCDD 투여에 의한 간세포의 지방구 침윤과 세포크기의 다양성, 간세포의 과염 색상과 공포변성이 TCDD 투여와 함께 키토산 올리고머를 섭취한 군 모두에서 현저하게 회복되었다. 혈청의 면역인자인 IgA와 IgM의 농도에서는 대조군과 TCDD 단독투여 군보다 TCDD 투여와 함께 키토산 올리고머의 분자량 5000~10000인 것을 섭취한 군(COLT)이 유의적으로 높은 농도를 나타내었다. 이와 같은 결과로 키토산 올리고머의 분자량이 1000 이하인 것은 혈구수의 회복과 간 지질억제에 효과적이었고, 분자량이 5000~10000인 것은 혈구수의 회복과 함께 혈청 콜레스테롤 저하 및 면역인자들 수준을 증가시키는 경향이 있었다. 특히 간의 조직병변이 키토산 올리고머 식이에 의해 정상으로 회복되는 경향을 관찰할 수 있었다. 그런데 키토산 올리고머의 분자량별 효과에 대하여는 앞으로 더 많은 연구가 필요한 것으로 사료된다.

Keywords

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