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Moussavi, M.; Wlasichuk, M.; Chang, J.P.; Habibi, H.R.
Molecular and cellular endocrinology, 03/2012, Letnik: 350, Številka: 1Journal Article
► There are seasonal changes in the GnIH-mediated gonadotropin production in goldfish. ► GnIH both stimulates and inhibits LH and FSH production depending on gonadal stage in goldfish. ► GnIH exerts differential actions on LH and FSH secretion and mRNA production in goldfish. Gonadotropin-inhibitory hormone (GnIH) inhibits gonadotropin release in birds and mammals. To investigate its role in teleosts, we examined the effects of synthetic goldfish (g)GnIH on pituitary LH-β and FSH-β subunit, and gGnIH receptor (gGnIH-R) mRNA levels and LH secretion in goldfish. Intraperitoneal injections of gGnIH increased pituitary LH-β and FSH-β mRNA levels at early to late gonadal recrudescence, but reduced serum LH and pituitary gGnIH-R mRNA levels, respectively, at early to mid-recrudescence and later stages of recrudescence. Static incubation with gGnIH elevated LH secretion from dispersed pituitary cell cultures from prespawning fish, but not at other recrudescent stages; suppressed LH-β mRNA levels at early recrudescence and prespawning but elevated LH-β at mid-recrudescence; and consistently attenuated FSH-β mRNA in a dose-specific manner. Results indicate that in goldfish, regulation of LH secretion and gonadotropin subunit mRNA levels are dissociated in the presence of gGnIH and dependent on maturational status and administration route.
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