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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Methionine Supplementation on Glutathione Peroxidase Activity in Young and Old Murine Tissues

성장기의 쥐와 늙은 쥐 조직의 Glutathione Peroxidase 활성에 대한 Methionine 투여의 효과

  • Published : 1994.06.01
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Abstract

The effect of methionine (Met) supplementation on glutathione peroxidase(GSHPx) activity in young and 14 month-old rat and mice was investigated. GSHPx activity was more enhanced by methionine supplementation in young rats when selenium (Se) was given as selenite than given in the form of selenomethione (Se-Met). However, GSHPx activity was not influenced by Met supplementation in the old rats. When diets were low in Se, the biopotency of ht eenzyme by Met was facilitated. No significant differences in GSHPx activity was observed with Met supplement in growing mice when Met was given 0.3% and 0.8% iin the diet at high levels of Se (2 ppm). The peak GSHPx in liver and kidney occurred at day 18, thereafter it decreased. Particularly, the liver GSHPx at day 18 increased 4.2 times than that at day 4 by 0.5% Met supplementation, while the unsupplemented group remained only 2.5 times increase. It is considered that in some tissues Met requirement may be met by Se-Met when rats were fed a diet suboptimal in Met. In addition, at lower levels of Se the utilization of Se is more enhanced by Met than at higher levels of dietary Se. Therefore, GSHPx activity may be influenced greatly by Met status along with dietary Se.

자라나는 과정의 젊은 흰쥐와 14개월 된 늙은 흰쥐, 생쥐들을 대상으로 Met 투여에 따른 간, 혈장, 신장, 비장 등의 glutathione peroxidase(GSHPx) 효소 변화를 측정 비교하였다. 성장기의 쥐에 있어서 Se을 Selenite 형태로 투여했을 때 0.5%의 식이 Met 공급은 같은 Se을 Se-Met 형태를 공급했을 때 보다 효소 활성이 증가하였다. 그러나, 14개월 된 늙은 쥐에서는 Met 투여에 대한 효소 활성은 큰 변화가 없었다. 일반적으로 식이 Se 증가는 효소 활성과 거의 정비례하나 1ppm Se 수준 이상에서는 완만하게 증가 또는 거의 정체하는 상태를 보이지만, 늙은 쥐에서는 Se의 식이 수준이 2ppm이 되어도 여전히 효소 활성이 증가하는 경향을 보였다. 성장기의 생쥐 실험에서도 2ppm Se 수준에서의0.3%와 0.8%의 식이 Met 투여는 효소 활성에 큰 영향이 없었다. 그러나 실험식이 투여 18일 경엔 4일째 보다 Met 투여군이 4.2배의 증가를 보인 반면 비투여군은 2.5배의 증가에 머물렀다. 18일경 이후 효소 활성이 감소하여 42일재는 반으로 감소함을 보였다. Se의 생체 활성은 특히 식이 Se 수준이 낮을 때 Met에 의해 증가되는 폭이 컸으며 Se 수준이 높을수록 상대적으로 감소함을 보였다. 위의 제반 결과에서 Met의 요구량이 Se-Met에 의해 대체되고 있음을 짐작할 수 있다. 그러므로 식이 Met 수준 상태에 따라 효소의 활성이 달라질 수 있다는 것을 시사한다.

Keywords

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