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- W1991997661 abstract "Regulation of plasma K + levels in narrow ranges is vital to vertebrate animals. Since seawater (SW) teleosts are loaded with excess K + , they constantly excrete K + from the gills. However, the K + regulatory mechanisms in freshwater (FW)-acclimated teleosts are still unclear. We aimed to identify the possible K + regulatory mechanisms in the gills and kidney, the two major osmoregulatory organs, of FW-acclimated Mozambique tilapia ( Oreochromis mossambicus). As a potential molecular candidate for renal K + handling, a putative renal outer medullary K + channel (ROMK) was cloned from the tilapia kidney and tentatively named “ROMKb”; another ROMK previously cloned from the tilapia gills was thus renamed “ROMKa”. The fish were acclimated to control FW or to high-K + (H-K) FW for 1 wk, and we assessed physiological responses of tilapia to H-K treatment. As a result, urinary K + levels were slightly higher in H-K fish, implying a role of the kidney in K + excretion. However, the mRNA expression levels of both ROMKa and ROMKb were very low in the kidney, while that of K + /Cl − cotransporter 1 (KCC1) was robust. In the gills, ROMKa mRNA was markedly upregulated in H-K fish. Immunofluorescence staining showed that branchial ROMKa was expressed at the apical membrane of type I and type III ionocytes, and the ROMKa immunosignals were more intense in H-K fish than in control fish. The present study suggests that branchial ROMKa takes a central role for K + regulation in FW conditions and that K + excretion via the gills is activated irrespective of environmental salinity." @default.
- W1991997661 created "2016-06-24" @default.
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- W1991997661 date "2014-12-01" @default.
- W1991997661 modified "2023-10-03" @default.
- W1991997661 title "Gene expression and cellular localization of ROMKs in the gills and kidney of Mozambique tilapia acclimated to fresh water with high potassium concentration" @default.
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- W1991997661 doi "https://doi.org/10.1152/ajpregu.00071.2014" @default.
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