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Expression and localization of retinoid receptors in the testis of normal and infertile men.
Molecular Reproduction and Development ( IF 2.7 ) Pub Date : 2020-08-07 , DOI: 10.1002/mrd.23412
Gui-Shuan Wang 1 , Ajuan Liang 2 , Yu-Bing Dai 3 , Xiao-Long Wu 1 , Fei Sun 1, 3, 4, 5
Affiliation  

Retinoic acid (RA), the active metabolite of vitamin A, is one of the most important factors regulating spermatogenesis. RA activates downstream pathways through its receptors (retinoic acid receptor alpha [RARA], retinoic acid receptor beta, and retinoic acid receptor gamma [RARG]) and retinoid X receptors (retinoid X receptor alpha [RXRA], retinoid X receptor beta [RXRB], and retinoid X receptor gamma [RXRG]). These receptors may serve as therapeutic targets for infertile men. However, the localization and expression of retinoid receptors in normal and infertile men were unknown. In this study, we found RARA and RARG were mostly localized in spermatocytes and round spermatids, RXRB was mainly expressed in Sertoli cells, and RXRG was expressed in most cell types in the fertile human testis. The localization of RARA, RARG, RXRB, and RXRG in men with hypospermatogenesis (HYPO) was similar to that of men with normal fertility. In addition, the messenger RNA expression levels of RARA, RARG, RXRA, RXRB, and RXRG were significantly decreased in men with Sertoli cell‐only syndrome (SCOS) and maturational arrest (MA), but not in men with HYPO. These results suggest that reduced levels of RARA, RARG, RXRB, RXRA, and RXRG are more closely associated with SCOS and MA spermatogenetic failure. These results could contribute to the development of new molecular indicators of spermatogenic dysfunction and might provide novel therapeutic targets for treating male infertility.

中文翻译:

类维生素A受体在正常和不育男性睾丸中的表达和定位。

维甲酸(RA)的活性代谢产物维甲酸(R)是调节精子发生的最重要因素之一。RA通过其受体(视黄酸受体α[RARA],视黄酸受体β和视黄酸受体γ[RARG])和类维生素X受体(类维生素X受体α[RXRA],类维生素X受体β[RXRB])激活下游途径,以及类维生素X受体γ[RXRG])。这些受体可以作为不育男性的治疗靶标。但是,在正常和不育男性中,类维生素A受体的定位和表达尚不清楚。在这项研究中,我们发现RARA和RARG主要位于精子细胞和圆形精子细胞中,RXRB主要在支持细胞中表达,而RXRG在大多数可育人类睾丸细胞中表达。RARA,RARG,RXRB,生殖功能低下(HYPO)男性的RX和RXRG与正常生育力的男性相似。此外,患有Sertoli cell-only syndrome(SCOS)和成熟性停搏(MA)的男性的RARA,RARG,RXRA,RXRB和RXRG的信使RNA表达水平显着降低,而HYPO男性则没有。这些结果表明,降低的RARA,RARG,RXRB,RXRA和RXRG的水平与SCOS和MA生精失败密切相关。这些结果可能有助于生精功能障碍的新分子指标的发展,并可能为治疗男性不育症提供新的治疗目标。Sertoli Cell-only syndrome(SCOS)和成熟性停搏(MA)的男性中Rx和RXRG显着降低,而HYPO男性则没有。这些结果表明,降低的RARA,RARG,RXRB,RXRA和RXRG的水平与SCOS和MA生精失败密切相关。这些结果可能有助于生精功能障碍的新分子指标的发展,并可能为治疗男性不育症提供新的治疗目标。Sertoli Cell-only syndrome(SCOS)和成熟性停搏(MA)的男性中Rx和RXRG显着降低,而HYPO男性则没有。这些结果表明,降低的RARA,RARG,RXRB,RXRA和RXRG的水平与SCOS和MA生精失败密切相关。这些结果可能有助于生精功能障碍的新分子指标的发展,并可能为治疗男性不育症提供新的治疗目标。
更新日期:2020-10-07
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