Quantitative analysis of bone morphogenetic protein 15 (BMP15) and growth differentiation factor 9 (GDF9) gene expression in calf and adult bovine ovaries

<p>Abstract</p> <p>Background</p> <p>It has been reported that calf oocytes are less developmentally competent than oocytes obtained from adult cows. Bone morphogenetic protein 15 (BMP15) and growth and differentiation factor 9 (GDF9) play critical roles in folliculogen...

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Main Authors: Hayashi Ken-go (Author), Ushizawa Koichi (Author), Kaneyama Kanako (Author), Hosoe Misa (Author), Takahashi Toru (Author)
Format: Book
Published: BMC, 2011-03-01T00:00:00Z.
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Summary:<p>Abstract</p> <p>Background</p> <p>It has been reported that calf oocytes are less developmentally competent than oocytes obtained from adult cows. Bone morphogenetic protein 15 (BMP15) and growth and differentiation factor 9 (GDF9) play critical roles in folliculogenesis, follicular development and ovulation in mammalian ovaries. In the present study, we attempted to compare the expression patterns of <it>BMP15 </it>and <it>GDF9 </it>in the cells of calf and cow ovaries to determine a relationship between the level of these genes and the low developmental competence of calf oocytes.</p> <p>Methods</p> <p>Bovine tissues were collected from 9-11 months-old calves and from 4-6 years-old cows. We characterized the gene expression of BMP15 and GDF9 in calf and adult bovine oocytes and cumulus cells using quantitative real-time reverse transcriptase polymerase chain reaction (QPCR) and <it>in situ </it>hybridization. Immunohistochemical analysis was also performed.</p> <p>Results</p> <p>The expression of <it>BMP15 </it>and <it>GDF9 </it>in cumulus cells of adult ovaries was significantly higher than that in calf ovaries, as revealed by QPCR. <it>GDF9 </it>expression in the oocytes of calf ovaries was significantly higher than in those of the adult ovaries. In contrast, <it>BMP15 </it>expression in the oocytes of calf and adult ovaries was not significantly different. The localization of gene expression and protein were ascertained by histochemistry.</p> <p>Conclusions</p> <p>Our result showed for the first time BMP15 and GDF9 expression in bovine cumulus cells. <it>BMP15 </it>and <it>GDF9 </it>mRNA expression in oocytes and cumulus cells was different in calves and cows.</p>
Item Description:10.1186/1477-7827-9-33
1477-7827