Mahoganoid蛋白及其mRNA在大鼠睾丸和附睾中的表达

目的:探讨M ahoganoid(Md)蛋白及其mRNA在成熟大鼠睾丸和附睾组织中的表达。方法:健康成年SD大鼠20只,取睾丸和附睾组织4%多聚甲醛固定,石蜡切片,用免疫组化SP法和原位杂交方法分别检测Md蛋白及其mRNA在睾丸和附睾组织中的表达。结果:免疫组化SP法显示:睾丸组织间质细胞、睾丸生精小管管周肌样细胞和各级生精细胞(精原细胞、初级精母细胞和精子细胞)、支持细胞呈阳性反应,Md蛋白主要表达于胞膜及胞质。在附睾组织,棕色免疫阳性反应物质可见于输出管的高柱状细胞、低柱状细胞的胞膜及胞质,以及附睾管的高柱状细胞、主细胞、基细胞的胞膜及胞质。其中,在附睾尾部的上皮细胞中仅见微弱的棕色免疫阳性反应物质。原位杂交方法显示:睾丸组织间质细胞、睾丸生精小管管周肌样细胞和各级生精细胞(精原细胞、初级精母细胞和精子细胞)、支持细胞上也均有Md mRNA阳性棕色颗粒杂交信号,主要表达于胞膜及胞质。在附睾组织,Md mRNA阳性棕色颗粒杂交信号也均可见于高柱状细胞、主细胞、基细胞的胞膜及胞质。结论:Md蛋白及其mRNA在成熟大鼠睾丸和附睾组织中均有表达,其生理功能尚有待阐明。

Distribution of Mahoganoid Prostein Its mRNA in the Testes and Epididymides of Mature Male Rats

Objective: To localize the Mahoganoid protein and Mahoganoid mRNA in the testes and epididymides of mature male rats.Methods: Testes and epididymides obtained from mature male SD rats (n=20) were fixed by 4%polyformaldehyde and sliced for immunohistochemical (IHC) test and in situ hybridization(ISH) test, respectively, for detecting Mahoganoid protein and Mahoganoid mRNA . Results: In both the 2 tests, clear brown staining was observed in Leydig cells, spermatogonia, primary spermatocytes, spermatids, Sertoli cells, and peritubular myoid cells. Both the Mahoganoid prosein and its mRNA were mainly located on cell membrane and cytoplasm. And in the epididymis tissues, the Mahoganoid protein and Mahoganoid mRNA were respectively expressed within the membrane and cytoplasm of principal cells, basic cells and epithelial cells. Conclusion: Both Mahoganoid protein and Mahoganoid mRNA are expressed in the male rat reproductive system and localized in Leydig cells, Sertoli cells, spermatogenic cells and epithelial cells. They play an important role in spermatogenesis but their physiological significance remains to be clarified.