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- W2088894522 abstract "We have previously demonstrated that polychlorinated biphenyls (PCBs) have caused phenotypic feminization/demasculinization of gonadal development in Xenopus laevis. Whether PCBs affect secondary sexual development has remained unknown. In this study, X. laevis tadpoles were exposed to Aroclor1254 and PCB(3) from stage 46/47 (system of Nieuwkoop and Faber) for up to 1 month postmetamorphosis. After 24 months postmetamorphosis, the degree of secondary sexual development was examined. Male oviducts were observed in some of the PCB-exposed male frogs, but not in control males. These male oviducts had not completely developed in histological structure when compared with mature female oviducts. Larynx weight and width of PCB-exposed males were significantly less than those of control males. Laryngeal histology showed that PCBs inhibited cartilaginous and muscular development of male frogs, i.e. elastic cartilages had not completely developed and laryngeal muscle fibers were smaller. In a further study on adult male frogs, a decrease in serum testosterone level was found in PCB-exposed frogs compared with controls, but serum estradiol level was not significantly affected. Our study suggests that PCBs can cause phenotypic feminization/demasculinization of male genital ducts and larynges, and these effects may, in part, result from the decrease in serum testosterone level in X. laevis." @default.
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- W2088894522 date "2007-10-01" @default.
- W2088894522 modified "2023-09-23" @default.
- W2088894522 title "Feminizing/demasculinizing effects of polychlorinated biphenyls on the secondary sexual development of Xenopus laevis" @default.
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- W2088894522 doi "https://doi.org/10.1016/j.aquatox.2007.06.011" @default.
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