Genistein increases progesterone secretion by elevating related enzymes in chicken granulosa cells

ABSTRACT Genistein, a biologically active isoflavone, exists in many soy products. It is well known that genistein binds to both oestrogen receptor alpha (ER&agr;) and oestrogen receptor beta (ER&bgr;), but it has a higher affinity to ER&bgr;. Genistein can also bind to the G protein‐coupled receptor 30 (GPR30, also known as G protein‐coupled oestrogen receptor 1 or GPER). Furthermore, weak oestrogenic activity has been found in genistein, but the mechanism of action remains unknown. The aim of this study was to investigate the in vitro effects of genistein on the secretion of progesterone (P4) and oestradiol (E2) in chicken granulosa cells harvested from follicles, as well as the mRNA expression of ERs in these cells. In addition, we examined the expression of key enzymes including steroidogenic acute regulatory protein (StAR), cytochrome P450 side‐chain cleavage (P450scc), and 3&bgr;‐hydroxysteroid dehydrogenase (3&bgr;‐HSD) in the process of P4 synthesis. The results showed that genistein did not affect the viability of granulosa cells, nor was the proliferating cell nuclear antigen (PCNA) protein changed. Among the 1‐, 10‐, 100‐, and 1,000‐nM concentrations tested, treatment with 1 nM genistein for 48 h significantly increased P4 but did not affect E2 secretion. Real‐time PCR results showed that the ER&bgr; gene expression in granulosa cells was markedly upregulated by 1 nM genistein treatment for 48 h, but there was no significant difference in ER&agr; and GPR30 expression. Genistein also increased the gene expression of StAR, P450scc and 3&bgr;‐HSD in the cultured granulosa cells. These results indicate that genistein acts directly on chicken granulosa cells to increase P4 production by upregulating the gene expression of key enzymes through binding in ER&bgr;. It may exert positive effects on the reproduction of late‐laying hens and act as an effective and safe feed additive for animals.

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