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The purpose of the present study was to evaluate effects of aflatoxin B 1 (AFB 1 ) on the cell cycle and proliferation of splenic cells in chickens. A total of 144 one-day-old Cobb male chickens were randomly divided into 2 equal groups of 72 each and were fed on diets as follows: a control diet and a 0.6 mg/kg AFB 1 diet for 21 days. The AFB 1 diet reduced body weight, absolute weight and relative weight of the spleen in broilers. Histopathological lesions in AFB 1 groups were characterized as slight congestion in red pulp and lymphocytic depletion in white pulp. Compared with the control group, the expression levels of ataxia-telangiectasia mutated (ATM), cyclin E 1 , cyclin-dependent kinases 6 (CDK6), CDK2, p53, p21 and cyclin B 3 mRNA were significantly increased, while the mRNA expression levels of cyclin D 1 , cdc2 (CDK1), p16, p15 were significantly decreased in the AFB 1 groups. Significantly decreased proliferating cell nuclear antigen (PCNA) expression and arrested G 0 G 1 phases of the cell cycle were also seen in the AFB 1 groups. In conclusion, dietary AFB 1 could induce cell cycle blockage at G 0 G 1 phase and impair the immune function of the spleen. Cyclin D 1 /CDK6 complex, which inhibits the activin/nodal signaling pathway, might play a significant role in the cell cycle arrest induced by AFB 1 .

Effects of aflatoxin B<sub>1</sub> on the cell cycle distribution of splenocytes in chickens