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. 1986 Jan;77(1):136–141. doi: 10.1172/JCI112268

Effects of vasopressin and bradykinin on anion transport by the rat cortical collecting duct. Evidence for an electroneutral sodium chloride transport pathway.

K Tomita, J J Pisano, M B Burg, M A Knepper
PMCID: PMC423319  PMID: 3080471

Abstract

Our previous studies in cortical collecting ducts isolated from rat kidneys have shown that vasopressin increases both sodium absorption and potassium secretion, while bradykinin inhibits sodium absorption without affecting potassium transport. To determine which anions are affected by these agents, we perfused cortical collecting ducts from rats treated with deoxycorticosterone and measured net chloride flux, net bicarbonate flux (measured as total CO2), transepithelial voltage, and the rate of fluid absorption. Arginine vasopressin (10(-10) M in the peritubular bath) caused a sustained sixfold increase in net chloride absorption and a two- to threefold increase in the magnitude of the lumen negative transepithelial voltage. Before addition of vasopressin, the tubules secreted bicarbonate. Vasopressin abolished the bicarbonate secretion, resulting in net bicarbonate absorption (presumably due to proton secretion) in many tubules. Bradykinin (10(-9) M added to the peritubular bath) caused a reversible 40% inhibition of net chloride absorption, but did not affect the transepithelial voltage or the bicarbonate flux. We concluded: (a) that arginine vasopressin stimulates absorption of chloride and inhibits bicarbonate secretion (or stimulates proton secretion) in the rat cortical collecting duct; and (b) that bradykinin inhibits net chloride absorption in the rat cortical collecting duct without affecting transepithelial voltage or bicarbonate flux. Combining these results with the previous observations on cation fluxes described above, we conclude that bradykinin inhibits electroneutral NaCl absorption (or stimulates electroneutral NaCl secretion) in the rat cortical collecting duct.

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Selected References

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