文献类型： 外文期刊
作者： Feng, T. 1 ; Schutz, L. F. 2 ; Morrell, B. C. 2 ; Perego, M. C. 2 ; Spicer, L. J. 2 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Anim Husb & Vet Med, Beijing 100097, Peoples R China
2.Oklahoma State Univ, Dept Anim Sci, Stillwater, OK 74078 USA
3.Texas A&M Hlth Sci Ctr, Coll Pharm, College Stn, TX 77843 USA
关键词： caspase 3; cattle; cytochrome P450 11A1; cytochrome P450 17A1; ovarian follicle; steroidogenesis
期刊名称：REPRODUCTION FERTILITY AND DEVELOPMENT （ 2020影响因子：2.311； 五年影响因子：2.396 ）
ISSN： 1031-3613
年卷期： 2018 年 30 卷 4 期
收录情况： SCI
摘要： Melatonin affects granulosa cell function in several species but its function in theca cells is less clear, particularly in monotocous animals. Thus, the objectives of this study were to determine the effects of melatonin on theca cell steroidogenesis, gene expression and cell proliferation in a monotocous species, namely cattle. Ovaries were collected from a local bovine abattoir, from which theca cells were isolated from large (8-22 mm) follicles and treated with various hormones in serum-free medium for 24 h or 48 h. Melatonin caused a dose-dependent inhibition (P < 0.05) of LH+insulin-like growth factor 1 (IGF1)-induced androstenedione and progesterone production. Also, melatonin inhibited (P < 0.05) LH+IGF1-induced expression of steroidogenic acute regulatory protein (StAR) mRNA (via real-time polymerase chain reaction) in theca cells, but it had no effect (P < 0.10) on cytochrome P450 11A1 (CYP11A1) and cytochrome P450 17A1 (CYP17A1) mRNA abundance. In LH+IGF1-treated theca cells, melatonin decreased caspase 3 (CASP3) mRNA to levels similar to those observed in LH-treated theca cells. In contrast, melatonin increased (P < 0.05) the number of bovine theca cells in both LH-and LH+IGF1-treated cultures. In conclusion, melatonin may act as an endocrine regulator of ovarian function in cattle by stimulating theca cell proliferation and inhibiting differentiation via inhibition of hormone-induced steroidogenesis.
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