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. 1986 Nov;78(5):1279–1286. doi: 10.1172/JCI112712

Hormonal regulation of proton secretion in rabbit medullary collecting duct.

S Hays, J P Kokko, H R Jacobson
PMCID: PMC423814  PMID: 3021819

Abstract

With the exception of aldosterone, little is known about the hormonal regulation of distal nephron acidification. These experiments investigated the effects of prostaglandin E2, indomethacin, lysyl-bradykinin, 8-bromo-cyclic AMP, and forskolin on proton secretion in the major acidifying segment of the distal nephron, the medullary collecting duct from inner stripe of outer medulla. Using in vitro microperfusion and microcalorimetry, net bicarbonate reabsorption (proton secretion) was measured in rabbit medullary collecting ducts before, during, and after exposure to each test substance. PGE2 reduced proton secretion 12.2%, while the following substances stimulated proton secretion: indomethacin 14.2%; 8-bromo-cyclic AMP 34.5%; forskolin 39%. Lysyl-bradykinin was without effect. These studies demonstrate that distal nephron acidification, in addition to being stimulated by aldosterone, is significantly inhibited by the hormone PGE2. The stimulation of proton secretion by cAMP suggests that other hormones known to activate adenylate cyclase may also influence distal nephron acidification.

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Selected References

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