Expression of components of the insulin-like growth factor system and gonadotropin receptors in bovine cumulus–oocyte complexes during oocyte maturation

IGF system expression has been largely explored in the bovine follicular wall whereas it remains poorly studied in the COC. Using semi-quantitative RT–PCR and Western blot analysis, we have investigated spatial and temporal expression of IGF-1, IGFR-1, IGFBP-2, IGFBP-4, as well as gonadotropin recep...

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Bibliographic Details
Published in:Domestic animal endocrinology 2004-08, Vol.27 (2), p.179-195
Main Authors: Nuttinck, F, Charpigny, G, Mermillod, P, Loosfelt, H, Meduri, G, Freret, S, Grimard, B, Heyman, Y
Format: Article
Language:English
Subjects:
Animals
binding proteins
Blotting, Western
Cattle
Computer Science
Cox-2
Cumulus expansion
cumulus oophorus
epidermal growth factor
Epidermal Growth Factor - pharmacology
Female
follicle-stimulating hormone
follicle-stimulating hormone receptors
FSH receptor
Gene Expression
hormone receptors
IGFBP-2
Insulin-Like Growth Factor Binding Protein 2 - genetics
Insulin-Like Growth Factor Binding Protein 4 - genetics
insulin-like growth factor binding proteins
insulin-like growth factor I
Insulin-Like Growth Factor I - genetics
insulin-like growth factor I receptors
Life Sciences
Meiosis
messenger RNA
oocytes
Oocytes - growth & development
Oocytes - metabolism
Ovarian Follicle - chemistry
Ovarian Follicle - metabolism
Receptor, IGF Type 1 - genetics
receptors
Receptors, FSH - genetics
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - analysis
Somatomedins - genetics
spatial variation
temporal variation
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Summary:IGF system expression has been largely explored in the bovine follicular wall whereas it remains poorly studied in the COC. Using semi-quantitative RT–PCR and Western blot analysis, we have investigated spatial and temporal expression of IGF-1, IGFR-1, IGFBP-2, IGFBP-4, as well as gonadotropin receptors in bovine COC during oocyte maturation. In addition, we have compared changes in the IGF system and FSHR expression during in vitro maturation in TCM199 alone or in the presence of 10 ng/ml of EGF. The transcripts for IGFR-1 and IGFBP-2 were detected in cumulus and germinal cells whereas IGF-1, IGFBP-4 and FSHR mRNA were restricted to cumulus cells. Topography of the IGF system and gonadotropin receptor expression within COC were unaffected by the maturation step. In contrast, levels of IGFBP-2 and FSHR expression decreased ( P
ISSN:0739-7240
1879-0054
DOI:10.1016/j.domaniend.2004.03.003