In vitro effects of insulin-like growth factors and insulin on oocyte maturation and maturation-inducing steroid production in ovarian follicles of common carp, Cyprinus carpio

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Dilip MukherjeeS P Bhattacharyya

Abstract

In vitro germinal vesicle breakdown (GVBD) in Cyprinus carpio oocytes was induced by recombinant human insulin-like growth factor-I and -II (IGF-I and IGF-II) and bovine insulin (b-insulin). Treatment of postvitellogenic ovarian follicles with IGF-I and b-insulin increased concentration of maturation-inducing hormone (MIH), 17alpha,20beta-dihydroxy-4-pregnane-3-one (DHP) in the medium. IGF-I and IGF-II both and b-insulin induced GVBD in denuded oocytes. IGF-I analogue R3 IGF-I was more potent than IGF-I in inducing GVBD of postvitellogenic follicles suggesting that ovarian IGF binding proteins may inhibit IGF-I action. Vitellogenic follicles, which were immature for oocytes to complete GVBD in response to DHP or HCG, underwent GVBD by IGF-I, not by b-insulin. IGF-I was also able to stimulate DHP production in such follicles. Addition of DHP and HCG to the culture of vitellogenic follicles containing IGF-I or b-insulin did neither potentiate the stimulation of GVBD induced by IGF-I nor initiate the same in response to b-insulin. Incubation of postvitellogenic follicles with trilostane (3beta-HSD inhibitor) had no inhibitory effects on IGF-I- and b-insulin-induced GVBD but attenuated the same under HCG stimulation. Trilostane, ho...Continue Reading

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Citations

Feb 21, 2013·Archives of Environmental Contamination and Toxicology·Sumana DasDilip Mukherjee
Jan 14, 2011·Fish Physiology and Biochemistry·Ksenia J GrohMarc J-F Suter
Apr 10, 2008·Toxicological Sciences : an Official Journal of the Society of Toxicology·Daniel L VilleneuveGerald T Ankley
Apr 10, 2012·General and Comparative Endocrinology·David A Irwin, Glen Van Der Kraak
May 8, 2010·General and Comparative Endocrinology·Sharon N Nelson, Glen Van Der Kraak
Jun 10, 2009·General and Comparative Endocrinology·Esther LubzensJoan Cerdà
Dec 15, 2015·General and Comparative Endocrinology·Rui ZhouWei Ge
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Feb 25, 2015·Zygote : the Biology of Gametes and Early Embryos·Sudip HajraSudipta Maitra
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