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Effect of RFRP-3, the mammalian ortholog of GnIH, on the epididymis of male rats.

Theriogenology. 2018 Sep 15;118:196-202. Epub 2018 Jun 05
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摘要


RFamide-related peptide-3 (RFRP-3) and its receptor (GPR147) play an important role in reproduction regulation in mammals. To understand the role of RFRP-3 in male reproductive function of epididymis, we first investigated the expression changes in RFRP-3 and its receptor at different stages of development, that is, postnatal day 20 (P20), 40 (P40), 60 (P60) and 80 (P80). Our results showed that fluctuations in the expression of GnIH and GPR147 during postnatal development occurred, and the highest epididymal GnIH and GPR147 expression were both detected in P60. Subsequently, we further investigated the effect of RFRP-3 on the histology, apoptosis and autophagy of the epididymis in vivo. For in vivo study, male rats were treated intratesticularly with different doses of RFRP-3 (control, 0.1 μg, 1 μg, and 10 μg per day) for 7 days. Our results show that RFRP-3 caused dose-dependent histological changes in the epididymal duct, such as a decline in the number of spermatozoa and an increase in degenerated and vacuolated epididymal epithelial cells. Rats treated intratesticularly with RFRP-3 also showed dose-dependent effects on caspase-3 activation and the expression of apoptotic markers (whole caspase-3, cleaved caspase-3 and Bcl-2). However, the expression of autophagy markers (Beclin-1 and Atg5) exhibited a bidirectional, dose-dependent effect. It is concluded that RFRP-3 plays a regulatory role in male rat reproduction, possibly because RFRP-3 mediates the apoptosis and autophagy of the epididymis.

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