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• W2084996528 abstract "A factor, secreted by theca cells, inhibits FSH induced resumption of meiosis in bovine oocytes that are surrounded by cumulus cells which are attached to a piece of the membrana granulosa (COCGs). In order to characterize this factor, theca cell conditioned medium (CMt) was heat-treated, filtered through a 5 kD spin off filter, charcoal treated, chloroform extracted and protease treated. To investigate whether the meiosis inhibiting factor produced by theca cells was also present in follicular fluid (FF), the same traetments were done with 50% bovine follicular fluid (bFF). COCGs, originating from 2 to 8 mm follicles of bovine ovaries collected at a slaughterhouse, were cultured in groups of 15 per 600 µl medium supplemented with 0.05 IU ml FSH for 22 hr at 39°C in a humidified atmosphere of 5% CO2. After culture the oocytes were denuded, stained with orcein, and the nuclear status assessed. Heat treatment did not affect the meiosis arresting capacity of CMt since a similar proportion of the oocytes remained at the GV stage after 22 hr of culture in heat treated CMt as compared to the proportion of oocytes in the GV stage after culture in untreated CMt. Filtering through a 5 kD spin-off filter revealed that the meiosis inhibiting action was maintained in the <5 kD fraction, although there was a significant (P < 0.05) loss of inhibiting activity compared to nonfiltered CMt. No significant decrease was observed in the meiosis arresting capacity of the <5 kD fraction after charcoal or protease treatment. Extraction of the <5 kD fraction with chloroform also did not affect the theca cell produced factor. The effect of the theca cell factor on the progression of meiosis of the oocytes that resumed meiosis, as demonstrated by a very low percentage of the oocytes that matured up to the M2 stage, was not affected following any of the treatments. With regard to bFF, the results show a lower percentage of the oocytes in the GV stage after culture in 50% bFF as compared to culture in CMt, but progression of meiosis was clearly inhibited as demonstrated by a significant higher proportion of the oocytes blocked in the M1 stage after resumption of meiosis. In general, with regard to meiotic inhibition, bFF showed the same pattern as CMt following the various treatments. It is concluded that the theca cell secreted factor which inhibits the FSH-induced resumption of meiosis in COCGs is a small, stable, polar molecule which is not a peptide. Mol. Reprod. Dev. 60:418-424, © 2001 Wiley-Liss, Inc." @default.
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• W2084996528 date "2001-01-01" @default.
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• W2084996528 title "Partial characterization of the factor in theca-cell conditioned medium that inhibits the progression of FSH-induced meiosis of bovine oocytes surrounded by cumulus cells connected to the membrana granulosa" @default.
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• W2084996528 doi "https://doi.org/10.1002/mrd.1105" @default.
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