Characterisation of the cellular and molecular responses of ovine oocytes and their supporting somatic cells to pre-ovulatory levels of LH and FSH during in vitro maturation

Matthew Cotterill, Sally Louise Catt, Helen M Picton

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8 Citations (Scopus)


The response of Graafian follicles to pre-ovulatory surge levels of FSH and LH in vivo triggers the terminal differentiation of granulosa cells and oocyte maturation. In polyovular species, the LH-driven signalling uses the epidermal growth factor (EGF)-like ligands AREG, EREG and BTC to promote oocyte maturation and cumulus expansion. This experimental series used a physiologically relevant ovine in vitro maturation (IVM) system to evaluate the impact of exposure to pre-ovulatory levels (100a?Sng/ml) of LH and FSH on ovine cumulus cell expression of EGF-like ligands in vitro. The serum-free sheep IVM system supported high levels (91.4 ) of gonadotrophin-induced maturation of cumulus-enclosed oocytes and embryo development to the blastocyst stage (34.5 ). Results were equivalent to a serum-based IVM system (85.1 IVM, 25.8 blastocyst rate; P>0.05) but were significantly different (P
Original languageEnglish
Pages (from-to)195 - 207
Number of pages13
Issue number2
Publication statusPublished - 2012

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