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首页> 外文期刊>Fish Physiology and Biochemistry >Morphological and histological changes in the genital ducts of the male Atlantic stingray, Dasyatis sabina, during the seasonal reproductive cycle
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Morphological and histological changes in the genital ducts of the male Atlantic stingray, Dasyatis sabina, during the seasonal reproductive cycle

机译：季节性繁殖周期中雄性大西洋黄貂鱼Dasyatis sabina生殖器导管的形态和组织学变化

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摘要

Changes in the morphology and histology of the epididymis and seminal vesicle in male Atlantic stingrays (Dasyatis sabina) were examined in relation to the seasonal reproductive cycle. Observations on the size and structure of these organs were accompanied by analysis of cell proliferation in genital duct epithelia using proliferating cell nuclear antigen ( PCNA) as a marker for mitotic activity. No signs of reproductive tract growth or histological alteration were apparent during the initial stages of spermatogenesis. However, increased PCNA expression in the seminal vesicle epithelium was observed during this period, suggesting that this organ begins to undergo preparatory changes at an early stage in the reproductive cycle. During late spermatogenesis, heightened expression of PCNA in epithelial cells of the epididymis and seminal vesicle was observed in conjunction with dramatic increases in size and semen content of these organs. Extensive changes in the histological architecture of the genital ducts also were evident at this time, including regression of the stroma and an increase in size and secretory activity of the epithelium. Although the epididymis regressed in size and structure shortly after sperm production was completed, the seminal vesicle retained its appearance and activity for the duration of the 7-month copulatory period. Afterwards, immune cell content increased considerably in both ducts, likely reflecting clearance of residual spermatozoa in preparation for the subsequent reproductive season. The present study provides a basis for future reports on the physiological regulation of reproductive tract function in elasmobranchs, and establishes PCNA immunocytochemistry as a novel tool for such investigations.
机译：考察了雄性大西洋黄貂鱼（Dasyatis sabina）附睾和精囊的形态和组织学变化与季节性繁殖周期的关系。在观察这些器官的大小和结构的同时，还使用生殖细胞核抗原（PCNA）作为有丝分裂活性的标记来分析生殖管上皮细胞的细胞增殖。在精子发生的初期，没有明显的生殖道生长或组织学改变的迹象。然而，在此期间观察到精囊上皮中PCNA表达增加，这表明该器官在生殖周期的早期开始进行预备性改变。在晚期生精过程中，观察到附睾和精囊上皮细胞中PCNA的表达增加，同时这些器官的大小和精液含量也急剧增加。此时，生殖器导管的组织学结构也发生了广泛的变化，包括间质的退化以及上皮细胞的大小和分泌活性的增加。尽管附睾在精子生产完成后不久就退缩了大小和结构，但精囊在7个月的交配期仍保持了外观和活性。此后，两条导管中的免疫细胞含量均显着增加，这可能反映了残留精子的清除，为随后的生殖季节做准备。本研究为将来在弹s中生殖道功能的生理调节提供了基础，并建立了PCNA免疫细胞化学作为这种研究的一种新工具。

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