Hypertrophy and polysaccharide production in the kidney associated with sexual maturation of male small-egged Kajika, Cottus pollux SE
Hypertrophy and polysaccharide production in the kidney associated with sexual maturation of male small-egged Kajika, Cottus pollux SE
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肾脏肥大和多糖产生与雄性小卵 Kajika, Cottus pollux SE 性成熟相关
DOI：
10.1007/s10228-015-0496-1
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发表时间：
2016
影响因子：
1.2
通讯作者：
Daisuke Tahara
中科院分区：
文献类型：
--
作者：
Yasunori Koya;Ryoji Fujii;Hidenobu Yambe;Daisuke Tahara
虽然以前曾报道过棉科植物在繁殖期间肾脏肥大，但肾脏在繁殖中的功能尚不清楚。为了阐明肾脏在生殖中的作用，我们在小卵的Kajika、CottuspolluxSE sensu Yokoyama和Goto（2005）中检测了性腺和肾脏重量、血清雄激素水平、肾脏组织学和尿液蛋白质含量的季节性变化。与非繁殖期（8月）相比，繁殖期（12月）雄鱼的肾脏肥大相当于肾脏-躯体指数值增加了2倍。近曲小管上皮细胞高度的显著增加与血清11-酮睾酮水平升高相关，表明肾脏总重量从非生殖期增加到生殖期。生殖期上皮细胞质中可见含多糖的周期性酸希夫（PAS）阳性颗粒。在繁殖期间，有筑巢行为的雄鸟膀胱中保留的尿液含有糖蛋白和低分子量的含多糖物质。我们讨论了肾脏和肾脏分泌物在雄棉巢种中的作用。
Although renal hypertrophy during the reproductive period has been reported previously in species ofCottus, the function of the kidney in reproduction remains unknown. In order to clarify the role of the kidney in reproduction, seasonal changes in gonad and kidney weight, serum androgen levels, kidney histology, and the protein content of urine, were examined in the small-egged Kajika,CottuspolluxSE sensu Yokoyama and Goto (2005). Compared to the non-reproductive period (August), renal hypertrophy of male fish during the reproductive period (December) was equivalent to a twofold increase in kidney-somatic index values. A marked increase in epithelial cell height in the proximal convoluted tubule (PT) was correlated with elevated serum 11-ketotestosterone levels, suggesting that total kidney weight increased from the non-reproductive to the reproductive period. Periodic acid-Schiff (PAS)-positive granules containing polysaccharides were observed in the cytoplasm of PT epithelia during the reproductive period. Urine retained in the urinary bladders of males exhibiting nesting behavior contained glycoproteins and low-molecular-weight substances containing polysaccharides during the reproductive period. We discussed the role of the kidney and kidney secretions in nesting male species ofCottus.