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首页> 外文期刊>Canadian Journal of Zoology >Distinct seawater and freshwater types of chloride cells in killifish,Fundulus heteroclitus
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Distinct seawater and freshwater types of chloride cells in killifish,Fundulus heteroclitus

机译：淡水鱼，鲈鱼中不同类型的海水和淡水中的氯化物细胞

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摘要

Physiological and morphological differences between killifish adapted to seawater (SW) and fresh water (FW) were examined with special reference to chloride cells. There was no difference in plasma osmolality between SW- and FW-adapted fish, reflecting their euryhalinity. A rich population of chloride cells was detected in whole-mount preparations of the gills and opercular membrane from SW- and FW-adapted fish. There was no difference between SW- and FW-adapted fish in gill Na+,K+-ATPase activity or oxygen-consumption rates. The gill chloride cells were located mostly in a flat region of the afferent-vascular edge of the filaments. In both tissues, the cells were larger in FW- than in SW-adapted fish. The apical membrane of chloride cells was invaginated to form a pit in SW-adapted fish, whereas it was flat or showed projections and was equipped with microvilli in FW-adapted fish. Chloride cells often interdigitated with neighboring accessory cells in SW-adapted fish, forming multicellular complexes. In FW-adapted fish, on the other hand, a pair of chloride cells that were similar in size was occasionally associated to form "twin cells." Thus, distinct SW and FW types of chloride cells were defined. Our findings suggest that SW- and FW-type chloride cells are equally active in the two environments, but exhibit different ion-transporting functions.
机译：特别针对氯化物细胞，研究了适应海水（SW）和淡水（FW）的kill鱼之间的生理和形态差异。适应SW和FW的鱼的血浆渗透压没有差异，这反映了它们的鱼腥感。在适应SW和FW的鱼类的whole和腹膜的整装制剂中检测到大量氯化物细胞。适应SW和FW的鱼类的g Na +，K + -ATPase活性或耗氧率没有差异。氯化chloride细胞大部分位于细丝的传入血管边缘的平坦区域。在两种组织中，FW-中的细胞均大于SW适应鱼中的细胞。在适应SW的鱼类中，氯化物细胞的顶膜向内凹陷形成凹坑，而在适应FW的鱼中，其平坦或呈突起状并带有微绒毛。氯化物细胞通常与适应SW的鱼中的相邻辅助细胞相互交叉，形成多细胞复合物。另一方面，在适应FW的鱼中，偶尔会出现一对大小相似的氯化物细胞，形成“双胞胎”。因此，定义了不同类型的氯化物电池的SW和FW类型。我们的发现表明，SW型和FW型氯化物细胞在两种环境中均具有相同的活性，但表现出不同的离子转运功能。

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