Characterization of a novel cell-surface protein expressed on human sperm

Ruey Bing Yang, Heng Kien Au, Chii Ruey Tzeng, Ming T. Tsai, Ping Wu, Yu Chih Wu, Thai Y. Ling, Yen H. Huang

研究成果: 雜誌貢獻文章

8 引文 斯高帕斯(Scopus)

摘要

BACKGROUND: Precise sperm-oocyte interaction is a critical event for successful fertilization. However, the identity of molecules involved in this process in humans remains largely unknown. This report describes the identification and characterization of a novel cell-surface protein and its potential role in human sperm-oocyte interaction. METHODS: AND RESULTSWe previously identified an orphan guanylyl cyclase receptor (mouse GC-G) highly enriched in mouse testis and involved in sperm activation. By using a comparative genomic approach, we found the homologue gene in human (hGC-G) composed of 21 exons, spanning a minimum of 48 kb on chromosome 10q25. Real-time RT-PCR analysis revealed hGC-G mRNA selectively expressed in testis but with low or no expression in all other tissues examined. Compared with mGC-G, the hGC-G transcript contains three 1-bp deletions and two in-frame termination codons, which results in a short putative receptor-like polypeptide. Western blot analysis with an anti-hGC-G-specific antibody confirmed the protein expression of hGC-G in human sperm lysate. Flow cytometry and confocal immunofluorescence analysis demonstrated the localization of hGC-G protein on the acrosome cap and equatorial segment of mature human sperm. In addition, an integrin-binding Arg-Gly-Asp (RGD) motif was found in the extracellular domain of hGC-G. Pre-incubation of the hGC-G RGD peptide with zona pellucida-free oocytes greatly decreased the binding of human sperm to hamster oocytes, which suggests a role for hGC-G role in sperm-oocyte interaction. CONCLUSION: ShGC-G is a novel surface protein on human sperm and potentially mediates sperm-oocyte interaction through its RGD-containing motif.

原文英語
頁(從 - 到)42-51
頁數10
期刊Human Reproduction
25
發行號1
DOIs
出版狀態已發佈 - 一月 2010

ASJC Scopus subject areas

  • Obstetrics and Gynaecology
  • Rehabilitation
  • Reproductive Medicine

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