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核农学报  2013 

GnRH主动免疫对雄性大鼠垂体-睾丸轴功能的影响

, PP. 523-531

Keywords: GnRH,主动免疫,垂体睾丸轴,大鼠

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Abstract:

本研究用GnRH并列体二聚物(GnRH-TDK)主动免疫SD雄性大鼠观察其对大鼠垂体-睾丸轴功能的影响,以探讨GnRH主动免疫去势的分子机理。24只性成熟SD雄鼠随机分为免疫组和对照组,免疫组雄鼠于12周龄时初免,8周后加免,对照组雄鼠不做任何注射。每两周采集血液放免法检测血清抗体滴度及激素含量变化。加免后4周脱颈处死所有雄鼠,收集垂体、睾丸实时荧光定量PCR分析相关生殖基因mRNA的变化。结果显示,GnRH主动免疫后12只免疫雄鼠中11只血清GnRH抗体滴度显著上升,血清LH、FSH及睾酮(T)均极显著下降到检测限附近或以下(p<0.01),同时睾丸严重萎缩,其重量及体积下降到对照组睾丸的20%(p<0.01),组织切片显示,曲细精管上皮组织严重受损,管内仅有少数退化的精原细胞。与对照组相比,GnRH主动免疫极显著下调雄鼠垂体GnRH受体、LH-β、FSH-β和睾丸LH受体及FSH受体mRNA表达水平(p<0.01)。由此可见,GnRH主动免疫可通过下调垂体GnRH受体、促性腺激素亚基及睾丸LH、FSH受体基因表达,影响垂体-睾丸轴的功能。

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