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Evaluation of the seminiferous epithelial cycle, spermatogonial kinetics and niche in donkeys (Equus asinus)

机译:评估驴的生精上皮循环,精原动力学和生态位(Equus asinus)

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摘要

Kinetics of spermatogonia as well as localization in niches have been described in rodents, but rarely in large animals or in species of economical interest. In this regard, and envisioning the possibility of spermatogonial transplantation from donkeys (Equus asinus) to mules (Equus mulus mulus), many variables that may contribute for an enhanced understanding of the spermatogonial biology in donkeys were investigated. Testes from five adult donkeys were routinely processed for high-resolution light microscopy. Donkey seminiferous epithelium can be divided in XII stages based on the development of the acrosomal system. In addition, spermatogonial morphology and morphometric analysis were performed allowing the characterization of two groups of spermatogonia: undifferentiated (Aund) and differentiating (A, A, A, B and B). Aund spermatogonia were present along all XII stages of the seminiferous epithelium cycle of this species, whereas differentiating spermatogonia were only at specific stages. Number of differentiating spermatogonia gradually increased as the cycle progressed, despite the apparent rigid regulation of the balance between mitosis and apoptosis throughout the spermatogenic process. Understanding of spermatogonial biology and kinetics in donkeys, revealed that type Aund spermatogonia are located in specific microenvironments, the spermatogonial niches. The present results enhance understanding of spermatogonial biology in donkeys providing information about subtypes, morphology, number and mitosis/apoptosis along the seminiferous epithelium cycle.
机译:在啮齿动物中已经描述了精原细胞的动力学以及在生态位中的定位,但是在大型动物或有经济意义的物种中很少见。在这方面,并设想了从驴(马属马)到qu子(马属马)的精原移植的可能性,研究了许多可能有助于增进对驴精子生物学理解的变量。常规对来自五只成年驴的睾丸进行高分辨率光学显微镜检查。驴生精上皮可根据顶体系统的发育分为十二阶段。此外,进行了精原细胞形态学和形态计量学分析,以表征两组精原细胞:未分化的(Aund)和分化的(A,A,A,B和B)。该物种的生精上皮细胞周期的所有第十二阶段都存在精原细胞,而精原细胞的分化仅在特定阶段。尽管整个生精过程中有丝分裂和凋亡之间的平衡有明显的刚性调节,但随着周期的进行,分化的精原细胞的数量逐渐增加。对驴精原生物学和动力学的了解表明,Aund型精原细胞位于特定的微环境中,即精原生态位。本研究结果增强了对驴精原生物学的理解,提供了沿生精上皮循环的亚型,形态,数量和有丝分裂/凋亡的信息。

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