Previtellogenic oocyte growth and transcriptional changes of steroidogenic enzyme genes in immature female Atlantic cod (Gadus morhua L.) after exposure to the androgens 11-ketotestosterone and testosterone

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

kortner, tm (Autor) Outra; rocha, e (Autor) ICBAS; arukwe, a (Autor) Outra

Revista

Título: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology

Vol. 152

Páginas: 304-313

ISSN: 1095-6433

Editora: Elsevier

Indexação

ISI Web of Knowledge - 46 Citações

Scopus - 56 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências biológicas

Outras Informações

ID Authenticus: P-003-MPQ

DOI: 10.1016/j.cbpa.2008.11.001

Abstract (EN): We have studied in vivo, the effects of physiological androgen (11-ketotestosterone: 11-KT and testosterone: T) concentrations on the growth of cod previtellogenic oocytes and steroidogenic gene expression patterns. Immature female Atlantic cod were injected three times (days 0, 7 and 14) with 0.05, 0.5 and 5 mg/kg of 11-KT and T. The control group was injected with the carrier solvent (ethanol diluted 1:10 in sunflower oil). Quantitative histological analyses demonstrated growth and development of previtellogenic oocytes after exposure to androgens. The oocyte developmental effect of androgens was more pronounced in fish receiving 11-KT. Quantitative PCR analysis demonstrated dose- and androgen-specific modulation of mRNA expression for genes involved in steroidogenesis (StAR (steroidogenic acute regulatory) protein, P450scc (P450-mediated cholesterol side-chain cleavage), 20 beta-HSD (20 beta-hydroxysteroid dehydrogenase)) and cell growth control, namely - opioid growth factor receptor (OGF-R), progesterone receptor protein p23 (PR23P) and apoptosis-inducing TAF9-like domain 1 (TAF9). Messenger RNA species associated with the zona pelucida, namely - the zona pellucida protein A domain (ZPA) and egg envelope glycoprotein (EeG) were modulated based on dose and androgen type. Cyclin-B mRNA expression was not affected by androgen exposure. Interestingly, we showed recently that these transcripts were responsive to in vitro androgen exposure in previtellogenic cod ovary. In conclusion, the present study adds further information regarding the effects of androgens on the development of previtellogenic oocytes, suggesting androgen control of early oocyte growth in cod. The enhanced effects of 11-KT on oocyte growth support our hypothesis that non-aromatizable androgens play significant roles in the regulation of early previtellogenic oocyte growth and development.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10