Vasotocin - A new player in the control of oocyte maturation and ovulation in fish

General and Comparative Endocrinology
K P Joy, R Chaube

Abstract

In this article, the physiological role of ovarian vasotocin (VT) on fish final oocyte maturation (FOM) and ovulation is reviewed based on the studies mainly available in the catfish Heteropneustes fossilis. The VT system is characterized in the follicular layer of the oocytes by both immunocytochemical and in situ hybridization techniques. The distribution was confirmed in isolated follicular layer preparations by HPLC characterization and quantification. Three VT receptor subtype genes are identified: V1a1 and V1a2 subtypes are distributed in the follicular layer and V2 subtype is present along the granulosa-oocyte membrane junction. The expression of peptide, VT precursor gene and VT receptor genes shows seasonal and periovulatory changes in the ovary. VT secretion is modulated by E2 differentially in a season-specific manner, and by progestin steroids positively. VT modulates E2 in a biphasic manner in early recrudescent phase and induces a steroidogenic shift inhibiting E2 and stimulating progestin steroid (P4, 17P4 and 17,20β-DP) pathways in the late recrudescent phase. VT stimulates prostaglandin secretion, germinal vesicle breakdown (GVBD), oocyte hydration and ovulation. VT acts through different receptors to stimulate...Continue Reading

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Citations

May 3, 2016·General and Comparative Endocrinology·P BanerjeeR Chaube
Aug 21, 2016·Molecular Reproduction and Development·Hui LiuNeil J Gemmell
May 30, 2020·Proceedings of the National Academy of Sciences of the United States of America·Kimberly MitchellVance L Trudeau

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