Objective: Aflatoxin G1 (AFG1) is a member of the carcinogenic aflatoxin family produced by aspergillus flavus. It is a major contaminating mycotoxin in food in areas of China with high cancer incidence. The purpose of this study is to explore the carcinogenic effects of AFG1 in NIH mice.
Methods: NIH mice were randomly divided into three groups. Two experimental groups were treated intragastrically by gavage with AFG1 3 microg/kg and AFG1 30 microg/kg respectively, 3 times a week for 24 weeks. The control group was treated with normal saline. All mice were fed with food that was free of AFGs as confirmed by HPLC analysis. The mice were weighed every week throughout the entire experiment, and then sacrificed and examined pathologically at the 58th and 74th weeks respectively.
Results: Compared with control mice receiving no AFG1, bronchial epithelial hyperplasia, alveolar hyperplasia and adenocarcinoma of lung were observed in mice receiving AFG1 treatment. The incidences of bronchial epithelial hyperplasia, alveolar hyperplasia and adenocarcinoma of lung were 60.0%, 10.0% and 30.0% for mice receiving 3 microg/kg AFG1 and 28.6%, 35.7%, 42.9% for mice receiving 30 microg/kg of the toxin, respectively.
Conclusion: Oral administration of AFG1 can induce hyperplastic lesions and adenocarcinoma of lung in NIH mice.