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- W2148216449 abstract "SLC26A7 is a newly identified basolateral Cl(-)/HCO(3)(-) exchanger specific to alpha-intercalated cells of the outer medullary collecting duct (OMCD). The purpose of the present experiments was to examine the expression of SLC26A7 in kidneys of vasopressin-deficient Brattleboro rats before and after treatment with desamino-Cys(1),d-Arg(8)-vasopressin (dDAVP). Brattleboro rats were treated with dDAVP, a vasopressin analog, for 8 days, and their kidneys were examined for the expression of SLC26A7. The expression of SLC26A7 protein, as examined by immunofluorescence, was undetectable in kidneys of Brattleboro rats. However, treatment with dDAVP induced expression of SLC26A7 protein, restoring it to levels observed in normal rats. These results were verified by Western blot analysis. The mRNA expression of SLC26A7 remained unchanged in response to dDAVP. Immunofluorescent labeling demonstrated abundant levels of anion exchanger type 1 in the OMCD of Brattleboro rats and a mild reduction in response to dDAVP. The abundance of H(+)-ATPase was not affected by dDAVP. The increased SLC26A7 expression directly correlated with enhanced aquaporin-2 expression, which is proportional to increased interstitial osmolarity in the medulla. In conclusion, vasopressin increases the expression of SLC26A7 protein through posttranscriptional mechanisms in the OMCD. The induction of SLC26A7 by vasopressin in OMCD cells of Brattleboro rats is likely an attempt by cells to regulate their cell volume and maintain HCO(3)(-) absorption in a state associated with increased interstitial medullary tonicity." @default.
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- W2148216449 date "2006-05-01" @default.
- W2148216449 modified "2023-10-18" @default.
- W2148216449 title "Vasopressin induces expression of the Cl<sup>−</sup>/HCO<sub>3</sub><sup>−</sup> exchanger SLC26A7 in kidney medullary collecting ducts of Brattleboro rats" @default.
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- W2148216449 doi "https://doi.org/10.1152/ajprenal.00247.2005" @default.
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