Objective　To explore the mechanism of male reproductive toxicity of bisphenol-A.Methods　The morphological characteristics of seminiferous tubule,vimentin filaments and p53 gene expression in sertoli's cells of adult SD rats orally exposed to 0.5% bisphenol-A were observed and analyzed by histo-chemical and immuno-histochemical methods.Results　After 2-week-exposure to 0.50% bisphenol-A,the disattachment between sertoli's cell and spermatogonia,spermatogonia arranged in disorder and displacement of spermatogonia away from the basement membrance of seminiferous tubules as well as the flocculated chromatins of nuclei in sertoli's cells and spermatogonia were observed.Fourfold increase of p53 expression in nuclei of spermatogonia and leydig's cells and the collaps of vimentin filaments in sertoli's cells were also found.Conclusion　The results suggested that the disattachment between sertoli's cells and spermatogonia,might be associated with the collaps of vimentin filaments in nuclei of sertoli's cells and the increase of p53 expres sion in nuclei of sertoli's cells and spermatogonia,which might be one of the important mechanisms of reproductive toxicity of bisphenol-A.The increase of p53 expression in nuclei of leydig's cells might predict the potential anti-androgenicity of bisphenol-A

Objective To explore the mechanism of effect of estrogic bisphenol_A(BPA) on vimentin in Sertoli cells.Methods Immunohistochemical methods and situ hybridization technique were applied to analyze the effets of BPA on expressions of vimentin and protein kinase C(PKC) gene in primary cultured Sertoli cells.Results The results showed that BPA lengthened the Sertoli cells,the vimentin gene in Sertoli cells could be expressed completely in vitro,but BPA could prohibited translation of vimentin gene,however there was no direct relationship between BPA and vimentin protein degradation.PKC gene couldn't be expressed in Sertoli cells. Conclusion The results suggested that BPA prohibited translation of vimentin gene and therefore blocked the formation of cytoskeleton of Sertoli cells,and finally caused deformation of these cells,and that protein kinase C didn't disturb degradative metabolism of vimentin in Sertoli cells.