Estrogens exert a
feedback control on gonadotropin (GtH) secretion at the level of the
hypothalamus and pituitary.
In the present
study, female catfish were ovariectomized (OVX) for 5 weeks in resting
(December-January) and preparatory (March-April) phases and supplemented with
estradiol-17β (E2, 0.05 and 0.5 µg/g body mass)
in 3-week ovariectomized fish to demonstrate
the nature of feedback control on expression of pituitary GtH subunit
(glycoprotein α - GPα, follicle- stimulating hormone - FSHβ and luteinizing
hormone - LHβ) genes.
Plasma steroid
hormone (E2, testosterone, P4 and cortisol) levels were monitored concurrently.
Plasma levels of E2, testosterone and P4 decreased after OVX but cortisol
increased initially but later decreased.
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