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 Dietary Zinc Levels on Cadmium-Induced Hepatotoxicity in Rats

식이성 아연 수준이 카드뮴 중독에 미치는 영향

  • 조수열 (영남대학교 식품영양학과) ;
  • 김명주 (영남대학교 식품영양학과)
  • Published : 1994.08.01
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Abstract

The effect of dietary zinc(Zn) levels on cadmium (Cd)-induced hepatotoxicity was studied in serum and liver of rats. Adult male Spraque-Dawley rats were fed on diets containing one of three levels of zinc carbonate(0, 56, $560\mu\textrm{g}/kg$ diet) and Cd-treated groups were administrated oral intubation with cadmium chloride 95.0 mg/kg of body weight) at the sametime once a week. Net weight gain (NWG), feed intake (FI) and feed effciiency ratio (FER) in Zn deficiency groups significantly decreased as compared to that of control and excessive groups. Cd oral intubation caused a decrease in NWG and FI but an increase in Zn deficiency group in FER. GSH-Px, GST and catalase activity showed significant decrease in Zn deficiency and Zn excessive group. LPO content in liver significantly increased in Zn deficiency group. Cd oral intubation increased the content of LPO in Zn deficiency group as compared to control. GSH content and GST activity of hepatic tissue significantly decreased in Zn deficiency and excessive group. The activity of AST and ALT in serum were markedly increased in Zn deficiency, Zn excessive and Cd-treated groups. LDH and ALP activities significantly increased in Cd-treated group while ALP activity decreased by Zn deficiency. It was observed that the livers of rats exposed to Cd and Zn excessive group showed a marked increase of hepatic enzyme as compare to only Cd-treated in rats.

식이성 아연의 급여 수준이 카드뮴을 투여한 흰주의 체내대사에 미치는 영향을 구명하고자 간손상 정도의 지표로 쓰이는 효소와 간해독 과정에 관여하는 효소의 활성을 생화학적 측면에서 관찰한 결과는 다음과 같다. 식이성 아연결핍군의 체중증가량, 식이섭취량 및 식이효율은 유의적으로 감소하였으며, 과잉군에서는 유의적이지는 않았으나 증가하는 경향이었다. 카드뮴은 체중 및 식이섭취량에 유의적인 영향을 미치지는 않았다. 간조직중의 GSH-Px, GST 및 catalase 활성은 식이성 아연 과잉과 결핍군 모두에서 감소하였는데, 특히 결핍시의 활성 감도는 유의적이었다. 카드뮴은 GSH-Px와 GST의 활성을 유의적으로 감소시켰으며, GST는 아연 과잉시 활성 감도 정도가 결핍군에 비하여 다소 억제된 것으로 나타났다. Catalase 활성은 카드뮴 투여시 아연결핍군에서 유의적인 감소가 있었으나 과잉군과 정상군에서는 그 감소가 유의적이지는 않았다. 간조직중의 LPO 함량은 식이성 아연 결핍시 유의적인 증가를 나타내었으며, 카드뮴은 아연 결핍보다 과잉시 LPO 생성이 지연되는 것으로 나타났다. GSH 함량은 결핍과 과잉군 모두 정상군에 비하여 유의적으로 감소를 나타내었으며, 카드뮴은 아연 결핍과 정상군의 GSH 함량을 유의적으로 감소시켰는데 정상군의 감소 정도가 가장 크게 나타났다. 혈청 AST와 ALT 활성은 정상군에 비하여 아연 결핍과 과잉시 증가하였으며, 특히 결핍시에 증가 정도가 크게 나타났다. 카드뮴은 AST 활성을 현저하게 증가시켰으나 각 군간에 유의성은 나타나지 않았다. 또한 카드뮴은 아연결핍군과의 정상군의 ALT의 활성을 유의적으로 증가시켰으며 과잉군의 경우 결핍군에 비하여 그 증가가 억제되었다. LDH 활성은 아연 공급수준에 따른 차이가 나타나지 않았으나, 카드뮴 투여는 그 활성을 유의적으로 증가시켰으며 아연과징군이 결핍군 보다 활성을 억제하는 것으로 나타났다. ALP는 아연결핍군의 활성 감소가 유의적이었으며, 카드뮴은 각 군의 활성을 유의적으로 증가시켰으나 아연 공급수준이 높아질수록 그 활성이 감소하였다.

Keywords

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