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Presence of angiotensin II immunoreactivity in the ovary of the rainbow trout (Oncorhynchus mykiss)
No full textRenin-angiotensin system is present in mammalian ovarian follicular fluid and follicles. The demonstration of specific binding sites for angiotensin II in the follicular structures of rats suggests that angiotensin II may be related to the regulation of steroid biosynthesis in the mammalian ovary. Little is known about the presence and the action of angiotensin II in nonmammalian ovaries. An immunocytochemical investigation of angiotensin II in developing ovarian follicles of trout has been carried out. The specific antiserum was raised against (Val5)-angiotensin II of the trout. There was strong immunoreactivity in the ooplasm of endogenous vitellogenic follicles. Angiotensin II immunoreactive material was present in the follicular cells, but not within oocytes at the end of vitellogenesis. Immunocytochemically angiotensin II-like material in the ovary of rainbow trout fluctuates during the cycle of development
Atrial natriuretic peptide in trout ovarian follicles
No full textAn immunocytochemical study on atrial natriuretic peptide (ANP) was carried out in trout ovaries using an antiserum raised against human atrial natriuretic peptide (hANP). Weakly immunoreactive material was observed both in the ooplasm of the previtellogenic and the early vitellogenic oocytes and in the follicular cells of the late vitellogenic oocytes. Binding sites for hANP have been located using 125I-ANP and light-microscopic autoradiography. These studies provide evidence of specific binding of ANP-like material in both early and advanced vitellogenic oocytes. Autoradiograms indicated that the ANP-like binding sites were localized to a subpopulation of follicles. The presence of ANP-like immunoreactive material and its specific binding sites in the ovary suggest a role for atrial natriuretic peptide as a regulator of the fish ovarian functio
Met-enkephalin-like immunoreactivity in the gonads of an antarctic icefish, Chionodraco hamatus
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AII and ANP modulation of estradiol 17B production in ovarian follicles. Preliminary results.
No full textInhibitory effect of cortisol on in vitro gonadotropin-induced sex steroid production by ovarian follicles of rainbow trout.
No full textImmunohistochemical localization of ANP-like and Ang II-like peptides in the ovary of the icefish Chionodraco hamatus.
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