畜牧兽医学报 ›› 2017, Vol. 48 ›› Issue (4): 652-659.doi: 10.11843/j.issn.0366-6964.2017.04.008

• 生物技术与繁殖 • 上一篇    下一篇

小鼠精子透明质酸酶SPAM1在受精过程中的功能研究

周崇1,3#*, 黄莉2,3#, 石德顺1, 蒋建荣1, 马场忠3   

  1. 1. 广西大学, 亚热带生物资源保护利用国家重点实验室, 南宁 530004;
    2. 广西壮族自治区兽医研究所, 广西兽医生物技术重点实验室, 南宁 530001;
    3. 日本筑波大学, 生命环境系, 筑波 305-8572
  • 收稿日期:2016-10-31 出版日期:2017-04-23 发布日期:2017-04-23
  • 通讯作者: 周崇,E-mail:czhou720@126.com
  • 作者简介:周崇(1976-),男,广西南宁人,博士,副教授,主要从事动物生殖生理学研究;黄莉(1978-),女,广西南宁人,博士,副研究员,主要从事动物病毒学研究,E-mail:lhuang405@126.com
  • 基金资助:

    广西自然科学基金(2014GXNSFCA118008)

Functional Analysis of Mouse Sperm Hyaluronidase SPAM1 in Fertilization

ZHOU Chong1,3#*, HUANG Li2,3#, SHI De-shun1, JIANG Jian-rong1, BABA Tadashi3   

  1. 1. State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning 530004, China;
    2. Guangxi Key Laboratory of Veterinary Biotechnology, Guangxi Veterinary Research Institute, Nanning 530001, China;
    3. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba Science City 305-8572, Japan
  • Received:2016-10-31 Online:2017-04-23 Published:2017-04-23

摘要:

旨在研究小鼠精子透明质酸酶SPAM1(Sperm adhesion molecule 1)对受精过程中精子/卵丘互作的影响,并初步探讨其可能的作用机制。本研究抽提小鼠尾尖基因组,利用PCR法检测小鼠Spam基因型;筛选的野生型(WT)和Spam1敲除(KO)小鼠,提取附睾尾部精子蛋白进行Western blot和酶活性检测;经TYH培养液2 h获能后,分别对精子的运动性、穿透和分散卵丘细胞能力及体外受精(IVF)进行统计分析。结果表明,KO小鼠精子中未检测到SPAM1蛋白,透明质酸酶活性也极显著低于WT小鼠(P<0.01);而获能后精子运动性,在KO和WT小鼠之间差异不显著(P>0.05);与WT相比,KO小鼠精子缺失Spam1后,极显著地影响卵丘细胞层基质中精子顶体反应的发生比率(P<0.01),导致精子穿透卵丘细胞层的能力极显著降低(P<0.01),仅有少数精子能够到达卵子透明带表面,大量精子极易黏附于卵丘细胞层表面或外部边缘(P<0.01);此外,KO小鼠精子IVF 2 h的卵丘细胞分散和受精率均呈现显著延迟(P<0.05)。综上表明,小鼠精子透明质酸酶SPAM1与顶体反应相关联并影响精子/卵丘互作。揭示SPAM1在穿卵过程中除了具有降解透明质酸的作用外,还存在其他的非酶活性功能。

Abstract:

This study was aimed to elucidate the possible functions of sperm adhesion molecule 1 (SPAM1) on the sperm/cumulus interaction during fertilization and explore its potential mechanism. Genomic DNA was extracted from the tails of mice and genotype for Spam1 null mutation was confirmed by PCR analysis. The protein of the screened wild type (WT) and Spam1-deficient (KO) sperm were extracted and confirmed by Western blot, and the hyaluronidase activity was measured by the colorimetric method. The epididymal sperm were capacitated by incubation for 2 h and subjected to the assays of sperm motility, sperm/cumulus interaction or in vitro fertilization (IVF). These results showed that the SPAM1 protein was readily absent in the KO sperm, and the hyaluronic acid-hydrolyzing enzymes activity was significantly reduced in the KO sperm, compared to that of the WT sperm (P<0.01). There were no significant differences in sperm motility between the KO and WT groups after capacitation (P>0.05). However, the loss of SPAM1 significantly influenced the percentage of acrosome-reacted sperm in the extracellular matrix of the cumulus (P<0.01), resulted in a markedly decrease in sperm entry into and/or penetration of the cumulus mass, only a few sperm succeeded in access to the surface of the oocyte zona pellucida (ZP) and contrastly a remarkably great deal of sperm accumulated on the surface or outer edge of the cumulus (P<0.01). In addition, sperm lacking SPAM1 caused the delayed cumulus disperse and fertilization at IVF 2 h (P<0.05). Therefore, mouse sperm hyaluronidase SPAM1 may be associated with the acrosome reaction and affect the sperm/cumulus interaction, which reveal that SPAM1 may play other possible roles in sperm access to the oocyte ZP except the hyaluronan-degrading activity.

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