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Retinoid‐dependent mRNA expression and poly‐(A) contents in bovine oocytes meiotically arrested and/or matured in vitro
Author(s) -
Gomez Enrique,
Rodríguez Aida,
Goyache Felix,
Dd́ez Carmen,
José Royo Luis,
Moreira Pedro N.,
Néstor Caamaño José,
Morán Erica,
GutiérrezAdán Alfonso
Publication year - 2004
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.20154
Subject(s) - biology , messenger rna , in vitro , microbiology and biotechnology , genetics , gene
The presence of retinoic acid (RA) during in vitro maturation (IVM) improves bovine oocyte quality and developmental potential. In this work, we investigated the underlying molecular mechanisms. Cumulus–oocyte complexes were meiotically arrested by roscovitine and/or matured in defined medium containing RA, 1% ethanol (vehicle), or no additives. Cumulus‐free oocytes were analyzed for poly‐(A) mRNA contents and relative mRNA expression of genes involved in cell cycle regulation (cyclin B1 and H1) and antioxidative defence (Mn‐superoxide dismutase and glucose‐6‐phosphate dehydrogenase). Poly‐(A) mRNA increased after meiotic inhibition and decreased with IVM completion, both in meiotically arrested and permissively matured oocytes, i.e., matured without previous meiotic arrest. RA dramatically increased poly‐(A) mRNA in meiotically arrested oocytes, but more than half of the poly‐(A) mRNA disappeared during maturation. Irrespective of oocyte origin, transcripts were detected for all the genes analyzed. IVM, with or without previous meiotic inhibition, increased expression of cyclin B1 and glucose‐6‐phosphate dehydrogenase, and decreased cyclin H1 and Mn‐superoxide dismutase. Except for a decreasing of Mn‐superoxide dismutase in meiotically arrested and matured oocytes, RA did not affect mRNA expression. Ethanol led to an abnormal poly‐(A) mRNA profile and expression of all the genes analyzed. RA does not modify expression of cyclin B1 and HI genes in the bovine oocyte, and probably does not generate oxidative stress. In addition, RA enhanced mRNA amount as measured by poly‐(A) mRNA contents. Mol. Reprod. Dev. 69: 101–108, 2004. © 2004 Wiley‐Liss, Inc.