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- W2134625247 abstract "The effects of gonadal steroids on GABA-, taurine (TAU)- and N-methyl-D, L-aspartate (NMA)-induced gonadotropin-II (GTH-II) release were investigated in male and female goldfish in vivo. In sexually regressed goldfish (both sexes mixed), intraperitoneal implantation for 5 to 10 days with solid Silastic pellets containing testosterone (100 μg/g), oestradiol (100 μg/g) or progesterone (100 μg/g) was previously shown to elevate serum sex steroid levels to values comparable to those in sexually mature animals, and to potentiate gonadotropin-releasing hormone-stimulated GTH-II release. In the present study, testosterone but not oestradiol or progesterone enhanced the stimulatory effects of exogenous GABA (100 μg/g) on GTH-II release in vivo. TAU (1 mg/g) stimulated GTH-II release in sexually regressed mixed sex and sexually recrudescent male goldfish, and both testosterone and oestradiol implantation enhanced GTH-II release induced by TAU. The glutamate agonist NMA (25 to 50 μg/g) was also found to stimulate GTH-II release; however it was relatively less effective in elevating serum GTH-II levels than GABA and TAU, and its effects were not modulated by sex steroid treatments. Pretreatment of goldfish with α-methyl-p-tyrosine to deplete brain and pituitary catecholam-ines did not affect NMA action on GTH-II release. Our results indicate that GABA, TAU and NMA are involved in the neuroendocrine regulation of GTH-II release in goldfish, and support the idea that testosterone participates in the positive feedback regulation of pituitary gonadotropin release in a non-mammalian vertebrate by enhancing GABA- and TAU-stimulated GTH release in vivo." @default.
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- W2134625247 date "1993-04-01" @default.
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- W2134625247 title "Testosterone Enhances GABA and Taurine but not N-Methyl-D,L-Aspartate Stimulation of Gonadotropin Secretion in the Goldfish: Possible Sex Steroid Feedback Mechanisms" @default.
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- W2134625247 doi "https://doi.org/10.1111/j.1365-2826.1993.tb00372.x" @default.
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