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- W1978134442 abstract "An early treatment of quail eggs with an antiestrogen (Tamoxifen = TAM) modifies the female gonads morphologically. In the left ovary, the proliferation of the germinal epithelium and formation of a cortex is markedly inhibited, while the medulla on both sides becomes more developed and keeps a cordal organization. The effects of TAM on the hormonal potentialities of 15-day embryo gonads have been investigated by radioimmunoassay. The data have been compared with those of normal gonads. The results indicate that the TAM treatment does not mainly modify the hormonal levels and patterns in the gonads of both sexes and does not inhibit the function of the hypothalamo-hypophyseal-gonadal axis. The reduced cortical development is thus not linked to an estrogen decrease but to competitive effects on receptors at the level of this tissue. Un traitement précoce des oeufs de Caille par un anti-oestrogène (le Tamoxifène = TAM) entraîne une modification de la morphologie des gonades femelles. Dans l'ovaire gauche, la prolifération de l'épithelium germinatif en un cortex est très nettement inhibée, tandis que des deux côtés, la medulla se développe d'une façon plus importante et garde une organisation en cordons. Les effets du TAM sur les potentialités hormonales des gonades embryonnaires de 15 jours ont étéétudiées par radioimmunologie. Les résultats ont été comparés à ceux obtenus avec des gonades témoins. Ils indiquent que le traitement par le TAM ne modifie pas les taux d'hormones dans les gonades des deux sexes et n'inhibe pas l'axe hypothalamo-hypophyso-gonadique. Le développement réduit du cortex n'est donc pas liéà une chute des oestrogènes mais bien à un effet compétitif du TAM au niveau des récepteurs de ce tissu." @default.
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- W1978134442 date "1984-12-01" @default.
- W1978134442 modified "2023-09-25" @default.
- W1978134442 title "Effects of early tamoxifen treatment on hormonal content of 15-day quail embryo gonads" @default.
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- W1978134442 doi "https://doi.org/10.1016/0016-6480(84)90085-6" @default.
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