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Sex differences in plasma concentrations of steroids during the sensitive period for brain differentiation in the zebra finch.
J Endocrinol ; 103(3): 363-9, 1984 Dec.
Article em En | MEDLINE | ID: mdl-6502063
Changes in plasma concentrations of sex steroids were examined in male and female zebra finch chicks during the sensitive period for differentiation of sexually dimorphic brain nuclei associated with the control of song. Using a chromatographic separation procedure and radioimmunoassay, androstenedione, testosterone and 5 alpha-dihydrotestosterone were detected in plasma at relatively high concentrations immediately after hatching. There were no sex differences in concentrations of these androgens. An oestrogen, oestradiol-17 beta, which is known to differentiate the song-control system, is raised specifically in the circulating plasma of male zebra finch chicks, and not in females. The surge in oestradiol, which occurs during the first week after hatching, coincides with the period when capacity for differentiation of the song system is maximal. Exposure of the male brain to oestradiol-17 beta could trigger neuronal differentiation.
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Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Diagnostic_studies Limite: Animals Idioma: En Ano de publicação: 1984 Tipo de documento: Article
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Diagnostic_studies Limite: Animals Idioma: En Ano de publicação: 1984 Tipo de documento: Article