Exogenous vitellogenesis and micropinocytosis in the lizard, Podarcis sicula, treated with follicle-stimulating hormone

General and Comparative Endocrinology
E Limatola, S Filosa

Abstract

The regulation of oocyte growth and of exogenous vitellogenesis by micropinocytosis has been studied in lizard Podarcis sicula kept at 28 degrees during the winter stasis and stimulated by follicle-stimulating hormone (FSH). Under these experimental conditions, oocyte auxocytosis as well as vitellogenesis is stimulated, while the follicular hierarchy is preserved. At the ultrastructural level, the flow of exogenous yolk precursors toward the oocyte increases and the pathway taken by them through intercellular spaces and zona pellucida is the same as that taken by peroxidase (tracer). Yolk precursor endocytosis is found only in oocytes greater than 1500 microns in diameter and takes place through the formation of several coated pits and vesicles. It is suggested that membrane receptors necessary for micropinocytosis are available only in such oocytes. Last, a different permeability of the ovarian follicle to exogenous yolk precursors during the different stages of oocyte growth and endovarian control of vitellogenesis are suggested.

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Citations

Oct 24, 2002·General and Comparative Endocrinology·Marina PriscoPiero Andreuccetti
Sep 11, 1999·General and Comparative Endocrinology·B S Nijagal, H N Yajurvedi
Jul 24, 2012·Journal of Morphology·Emir Pérez-BermúdezGeorgina Espinosa-López
Jun 14, 2016·General and Comparative Endocrinology·Mariailaria VerderameRosaria Scudiero
Jul 27, 2001·Molecular Reproduction and Development·C M MottaS Filosa
Dec 26, 2001·The Journal of Experimental Zoology·Ermelinda LimatolaMaurizio Romano
Jun 8, 2004·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Maria Gabriella MauriziiCarlo Taddei
Sep 19, 2002·Molecular Reproduction and Development·Maurizio RomanoErmelinda Limatola
Sep 19, 2002·Molecular Reproduction and Development·Patrizia RosanovaErmelinda Limatola
Jul 28, 2004·Molecular Reproduction and Development·Maurizio RomanoErmelinda Limatola
Nov 19, 1997·Molecular Reproduction and Development·M G MauriziiC Taddei

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