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. 1989 Jul;84(1):83–91. doi: 10.1172/JCI114174

Angiotensin II stimulates early proximal bicarbonate absorption in the rat by decreasing cyclic adenosine monophosphate.

F Y Liu 1, M G Cogan 1
PMCID: PMC303956  PMID: 2544631

Abstract

These studies explored the hypothesis that angiotensin II increases bicarbonate absorption in the proximal convoluted tubule (PCT) by decreasing intracellular cAMP. In vivo microperfusion was performed in rat PCT with measurements of bicarbonate absorption and of tubular fluid cAMP delivery, as a reflection of intracellular cAMP. Intravenous angiotensin II potently increased S1 PCT bicarbonate absorption (348 +/- 11 to 588 +/- 8 peq/min.min, P less than 0.001) and decreased tubular fluid cAMP (18 +/- 2 to 12 +/- 2 fmol/mm.min, P less than 0.05). Parathyroid hormone had the expected opposite effects, which were additive to those of angiotensin II. Over a wide range of hormonal activities, there was an excellent inverse relationship between hormonally modulated bicarbonate absorption and cAMP delivery. Pertussis toxin pretreatment significantly attenuated (by 35-45%) the angiotensin-induced increase in bicarbonate absorption and decrease in cAMP delivery, indicating Gi-protein intermediation. Luminal dibutyryl cAMP abolished the transport response to angiotensin II. In conclusion, these in vivo results suggest angiotensin II stimulates bicarbonate absorption in the S1 PCT by a G1-mediated depression in intracellular cAMP.

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Selected References

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