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首页> 外文期刊>Zoological Science >Facilitated NaCl Uptake in the Highly Developed Bundle of the Nephron in Japanese Red Stingray Hemitrygon akajei Revealed by Comparative Anatomy and Molecular Mapping
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Facilitated NaCl Uptake in the Highly Developed Bundle of the Nephron in Japanese Red Stingray Hemitrygon akajei Revealed by Comparative Anatomy and Molecular Mapping

机译：通过比较解剖学和分子映射揭示的日本红刺粉血液磨削的肾脏高度发达的肾上腺中的NaCl吸收。

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摘要

Batoidea (rays and skates) is a monophyletic subgroup of elasmobranchs that diverged from the common ancestor with Selachii (sharks) about 270 Mya. A larger number of batoids can adapt to low-salinity environments, in contrast to sharks, which are mostly stenohaline marine species. Among osmoregulatory organs of elasmobranchs, the kidney is known to be dedicated to urea retention in ureosmotic cartilaginous fishes. However, we know little regarding urea reabsorbing mechanisms in the kidney of batoids. Here, we performed physiological and histological investigations on the nephrons in the red stingray (Hemitrygon akajei) and two shark species. We found that the urine/plasma ratios of salt and urea concentrations in the stingray are significantly lower than those in cloudy catshark (Scyliorhinus torazame) under natural seawater, indicating that the kidney of stingray more strongly reabsorbs these osmolytes. By comparing the three-dimensional images of nephrons between stingray and banded houndshark (Triakis scyllium), we showed that the tubular bundle of stingray has a more compact configuration. In the compact tubular bundle of stingray kidney, the distal diluting tubule was highly developed and frequently coiled around the proximal and collecting tubules. Furthermore, co-expression of NKA alpha 1 (Na+/K+-ATPase) and NKCC2 (Na+-K+-2Cl(-) cotransporter 2) mRNAs was prominent in the coiled diluting segment. These findings imply that NaCl reabsorption is greatly facilitated in the stingray kidney, resulting in a higher reabsorption rate of urea. Lowering the loss of osmolytes in the glomerular filtrate is likely favorable to the adaptability of batoids to a wide range of environmental salinity.
机译：Bactoidea（射线和冰鞋）是Elasmobranchs的单群亚组，与Selachii（鲨鱼）分叉偏离南美州约270 mya。与鲨鱼相比，较大数量的巴伐太队可以适应低盐度环境，这是大多是雄鹿碱性物种的鲨鱼。在Elasmobranchs的OsMoregulatory器官中，已知肾脏致力于尿布软骨鱼中的尿素保留。然而，我们几乎很少了解巴伐克肾脏中的尿素重吸收机制。在这里，我们对红星（Hemidrygon Akajei）和两只鲨鱼种的肾脏进行生理和组织学研究。我们发现，黄貂鱼中盐和尿素浓度的尿液/血浆比率显着低于天然海水下的多云轿厢（Scyliorhinus Torazame）中的尿液和血浆级数，表明黄貂鱼的肾脏更强烈地重新使用这些渗透物。通过比较Stingray和带状臀部（Triakis Scylilium）之间的肾脏的三维图像，我们表明，管状束的黄貂鱼束具有更紧凑的配置。在狭窄的管状束的Stingray肾脏中，远侧稀释小管高度发达并且经常在近端和收集小管周围盘绕。此外，NKAα1（Na + / K + -ATP酶）和NKCC2（Na + -K + -2Cl（ - ）Cotroanger 2）MRNA在盘绕稀释段中的共表达。这些发现暗示在黄貂鱼肾中的NaCl Reablating大大促进，导致尿素的再吸收率较高。降低肾小球滤液中的渗透物的损失可能有利于轻抗对抗各种环境盐度的适应性。

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