目的:通过建立精索静脉曲张大鼠模型,探讨人类趋化素样因子超家族2(chemokine like factor-like myelin and lymphocyte and related proteins for vesicle trafficking and membrane link transmembrane domain-containing protein ...目的:通过建立精索静脉曲张大鼠模型,探讨人类趋化素样因子超家族2(chemokine like factor-like myelin and lymphocyte and related proteins for vesicle trafficking and membrane link transmembrane domain-containing protein 2, CMTM2)对精索静脉曲张大鼠生精过程的影响。方法:选取雄性 SD 大鼠40只(体重220~330 g,6~7周龄),将大鼠随机分为精索静脉曲张持续4、12周后处死取样组,和相应的接受假手术处理的对照组,每组均为10只大鼠。通过手术进行左肾静脉缩窄建立左侧精索静脉曲张的大鼠模型。将实验组和对照组大鼠于4周或12周后处死,取出左侧睾丸,游离附睾中精子,观察并计算精子密度与活力,测量生精小管外径、内径及上皮直径改变,并进行免疫组织化学分析以判断 CMTM2蛋白的表达状况。结果:与对照组相比,精索静脉曲张4周组中大鼠的精子密度[(63.9±7.1)×106/mL vs.(74.3±5.0)×106/mL]和活力[(58.7%±7.9%)vs.(66.1%±4.3%)]轻度下降(t =1.432,1.563;P =0.076,0.059),精索静脉曲张12周组中大鼠的精子密度[(40.5±7.2)×106/mL vs.(71.1±4.5)×106/mL]和活力[(35.2%±8.5%)vs.(63.4%±4.1%)]显著下降(t =3.754,3.933;P =0.004,0.002)。此外,CMTM2蛋白的表达水平在精索静脉曲张组也出现明显下降,对照组 CMTM2水平为精索静脉曲张12周组的(2.3±0.4)倍(t =1.978;P =0.039)。4周时,精索静脉曲张组生精小管外径出现轻度降低[(271.1±8.4)μm vs.(280.0±8.1)μm,t =1.361,P =0.132],而12周组则出现明显降低[(198.2±10.2)μm vs.(255.8±12.7)μm,t =2.125,P =0.003],此外,精索静脉曲张12周组的生精小管上皮直径出现明显下降[(54.1±1.5)μm vs.(75.5±4.1)μm,t =2.246,P =0.021]。结论:在精索静脉曲张大鼠模型中,精索静脉曲张与CMTM2蛋白水平降低相关,同时可导致睾丸生精小管直径变小及精子密度与质量受损。展开更多