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首页> 美国卫生研究院文献>The Journal of Biophysical and Biochemical Cytology >Teleost chloride cell. I. Response of pupfish Cyprinodon variegatus gill NaK-ATPase and chloride cell fine structure to various high salinity environments
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Teleost chloride cell. I. Response of pupfish Cyprinodon variegatus gill NaK-ATPase and chloride cell fine structure to various high salinity environments

机译：硬骨氯化物细胞。 I. up对虾priNa-K-ATPase和氯化物细微结构对各种高盐度环境的响应

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Certain euryhaline teleosts can tolerate media of very high salinity, i.e. greater than that of seawater itself. The osmotic gradient across the integument of these fish is very high and the key to their survival appears to be the enhanced ability of the gill to excrete excess NaCl. These fish provide an opportunity to study morphological and biochemical aspects of transepithelial salt secretion under conditions of vastly different transport rates. Since the cellular site of gill salt excretion is believed to be the "chloride cell" of the branchial epithelium and since the enzyme Na,K-ATPase has been implicated in salt transport in this and other secretory tissues, we have focused our attention on the differences in chloride cell structure and gill ATPase activity in the variegated pupfish Cyprinodon variegatus adapted to half-strength seawater (50% SW), seawater (100% SW), or double-stregth seawater (200% SW). The Na,K-ATPase activity in gill homogenates was 1.6 times greater in 100% SW. When 50% SW gills were compared to 100% SW gills, differences in chloride cell morphology were minimal. However, chloride cells from 200% SW displayed a marked hypertrophy and a striking increase in basal-lateral cell surface area. These results suggest that there are correlations among higher levels of osmotic stress, basal-lateral extensions of the cell surface, and the activity of the enzyme Na,K-ATPase.
机译：某些鱼腥硬骨鱼可以耐受盐度很高的介质，即比海水本身的盐度更高。这些鱼的被膜渗透渗透梯度非常高，它们存活的关键似乎是the提高了排泄过量NaCl的能力。这些鱼提供了一个机会，可以研究在运输速率差异极大的情况下跨上皮盐分泌的形态和生化方面。由于believed盐排泄的细胞部位被认为是the上皮细胞的“氯化物细胞”，并且由于Na，K-ATPase酶已经参与了这种和其他分泌性组织的盐转运，因此我们将注意力集中在杂种p鱼半透明藻（Syprinodon variegatus）适应半强度海水（50％SW），海水（100％SW）或双级海水（200％SW）的氯化物细胞结构和g ATPase活性的差异。在100％SW中，SW匀浆中的Na，K-ATPase活性高1.6倍。当将50％SW腮与100％SW腮进行比较时，氯化物细胞形态的差异很小。然而，来自200％SW的氯化物细胞显示出明显的肥大，基底-外侧细胞表面积显着增加。这些结果表明，在较高水平的渗透胁迫，细胞表面的基底-侧面延伸和酶Na，K-ATPase的活性之间存在相关性。

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