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학술저널
저자정보
저널정보
한국독성학회 Toxicological Research Journal of Toxicology and Public Health Vol.21 No.4
발행연도
2005.12
수록면
339 - 345 (7page)

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Aflatoxins are produced by Aspergillus flavus, parasiticus that grows in improperly stored cereals. Aflatoxin B₁ (AFB₁) is a potent hepatocarcinogen in a variety of experimental animals including human beings. In spite of a high attention to the hepatocarcinogenecity of aflatoxins, the relative toxicity of other types (AFB₂, AFG₁ and AFG₂) of the toxins is not fully clarified. Sprague-Dawley male rats were orally administered with AFB₁, AFB₂, AFG₁ and AFG₂ at the dose of 250, 1250, and 2500 μg/kg body weight. Animals were then killed at 12, 24 or 48 hrs following aflatoxin adminstration. Subsequently the relative weight of liver was measured and histopathological examination on the liver was performed. Level of 8-OxodG and expression of ras gene in the liver was determined. The relative liver weights at high doses of AFB₁ and AFG₁ was significantly low. The treatment of AFB₁ at the high dose of 2500 ㎍/㎏ showed vacuolar degeneration and centrilobular hepatic necrosis with inflammatory cells. The pathological changes by AFB₂, AFG₁ and AFG₂ were not clearly found. The formation of 8-OxodG by AFB₁ increased in a dose-dependent manner up to 24 hrs after a single treatment of AFB₁ thereafter decreased to the level of the control. The treatments of AFB₂, AFG₁ and AFG₂ showed an inconsistent pattern in the formation of 8-OxodG in the liver of rats with increasing time. The expression of ras oncogene in the liver by AFB₁ at the dose of 1250 ㎍/㎏ was increased twice compared to the control. The treatments of AFB₂, AFG₁ and AFG₂ at all doses decreased the expression of ras in the liver. These results in the present study indicate that AFB₁ among aflatoxins with low comparable levels is the most toxic as determined by early biomarkers such as 8-OxodG formation and ras expression. However, the levels of 8-OxodG and ras as biomarkers were not useful to predict the relative hepatocarcinogenicity of aflatoxins to AFB₁ in the present model. Further studies are required to look for other biomarkers to predict carcinogenic potency of aflatoxins.

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