Role of growth hormone and growth hormone receptor in oocyte maturation

被引:46
作者
Bevers, MM
Izadyar, F
机构
[1] Univ Utrecht, Fac Vet Med, Dept Farm Anim Hlth, NL-3508 TD Utrecht, Netherlands
[2] Univ Med Ctr, Dept Cell Biol, NL-3584 CX Utrecht, Netherlands
关键词
growth hormone; growth hormone receptor; oocyte maturation; bovine ovarian follicles;
D O I
10.1016/S0303-7207(02)00270-8
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Near the completion of growth, mammalian oocytes acquire the competence to resume and complete meiosis. In vivo the preovulatory LH surge triggers the resumption of meiosis in the oocyte contained in preovulatory follicles. When immature oocytes and the surrounding cumulus cells are released from their follicular environment, resumption of meiosis is induced spontaneously. Culture of bovine cumulus oocyte complexes (COCs) obtained from antral follicles results in blastocyst formation following in vitro maturation, in vitro fertilisation and in vitro embryo culture. Addition of growth hormone (GH) to the maturation medium accelerates nuclear maturation of cumulus enclosed bovine oocytes, induces cumulus expansion and promotes early embryonic development following in vitro fertilisation. The effect of GH is exerted through the cumulus cells and not mediated by IGF-I. Cumulus cells and the oocyte express mRNA for GH receptor. Using specific inhibitors it has been shown that the effect of GH on oocyte maturation and cumulus expansion is mediated by the cyclic AMP signal transduction pathway. Within COCs both cumulus cells and oocyte show GH immunoreactivity while expression of GH mRNA is only found in the oocyte. These observations point to a paracrine and/or autocrine action of GH in oocyte maturation. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
引用
收藏
页码:173 / 178
页数:6
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