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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Reproductive hormones affect follicular cells and ooplasm of Stage I and II oocytes in zebrafish

Maria Lígia Sousa A B , Ana Silva B , Fernanda Malhão A B , Maria João Rocha A B C , Eduardo Rocha A B and Ralph Urbatzka A D
+ Author Affiliations
- Author Affiliations

A CIIMAR – Interdisciplinary Centre of Marine and Environmental Research, CIMAR Associated Laboratory, UPorto – University of Porto, Laboratory of Cellular, Molecular and Analytical Studies, Rua dos Bragas 289, 4050-123 Porto, Portugal.

B ICBAS – Institute of Biomedical Sciences Abel Salazar, UPorto – University of Porto, Laboratory of Histology and Embryology, R. Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal.

C ISCS-N – Superior Institute of Health Sciences-North, CESPU, Cooperative Higher Education, Polytechnic and University, Rua Central de Gandra 1317, 4585-116 Gandra, Paredes, Portugal.

D Corresponding author. Email: rurbatzka@ciimar.up.pt

Reproduction, Fertility and Development 28(12) 1945-1952 https://doi.org/10.1071/RD15100
Submitted: 11 March 2015  Accepted: 26 May 2015   Published: 25 June 2015

Abstract

The basic pathway of oocyte development and its regulation is evolutionarily conserved among vertebrates; however, little is known about the role of hormones at the first stages (Stages I and II) of follicle development in fish. In the present study, zebrafish follicles at Stages I and II were exposed in vitro to the reproductive hormones 17β-oestradiol (E2), 11-ketotestosterone (11KT), 17,20β-dihydroxy-4-pregnen-3-one (DHP) and to the secondary messenger dibutyryl cyclic adenosine monophosphate (db-cAMP) at a concentration of 1 µM for a 48-h period. Morphological alterations of the ooplasm were assessed by transmission electron microscopy and of the granulosa cell layer by quantitative stereology. Expression of mRNA was analysed for cell-cycle genes (cyclin B and E) and resident proteins of the endoplasmic reticulum (calnexin and 78-kDa glucose-regulated protein (grp78/bip)). E2 and db-cAMP stimulated the presence of endoplasmic reticulum in the ooplasm and calnexin mRNA increased in the db-cAMP treatment, but also in response to 11KT and DHP. 11KT, DHP and db-cAMP inhibited the progression of the cell cycle in the granulosa–theca cell layer, indicated by a reduction of the nucleus volume-weighted size of granulosa cells and of increased cyclin E mRNA expression. Reproductive hormones had different effects on the ooplasm and the granulosa–theca cell layer of zebrafish follicles, predominantly at Stage II.

Additional keywords: cell cycle, endoplasmic reticulum, follicles, oocyte development.


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