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. 1982 Dec;70(6):1193–1204. doi: 10.1172/JCI110718

Regulation of Vasopressin Action by Prostaglandins

EVIDENCE FOR PROSTAGLANDIN SYNTHESIS IN THE RABBIT CORTICAL COLLECTING TUBULE

Michael A Kirschenbaum 1, Andrew G Lowe 1, Walter Trizna 1, Leon G Fine 1
PMCID: PMC370336  PMID: 7174790

Abstract

The present studies examined whether vasopressin increases prostaglandin biosynthesis in isolated rabbit cortical collecting tubules (CCT) and whether endogenous prostaglandin biosynthesis plays a role in modulating the response of this nephron segment to vasopressin. Three groups of studies were performed. In the first group, CCT and proximal straight tubules (PST) were incubated with [3H]arachidonic acid, and metabolites were separated and identified using silica gel thin-layer chromatography. CCT were capable of producing all of the major prostaglandins (PG) (PGE2 > thromboxane B2[TxB2] > PGF2α > PGI2). PST produced significantly lesser quantities of these lipids. In the second group, radiolabeled arachidonic acid was incorporated into the phospholipid pool of both CCT and PST, vasopressin was added to the incubation medium, and metabolities were separated and identified as above. Vasopressin stimulated the release of all of the major prostaglandins in CCT but had no effect on PST. PGE release into the incubation medium, as assessed by a radioreceptor assay, increased 108%, and a vasopressin analogue, 1-desamino-8-d-arginine vasopressin, had a quantitatively similar effect. In the third group, a submaximal dose of vasopressin was administered to isolated, perfused CCT studied in the presence and absence of indomethacin to assess whether endogenous prostaglandins play a role in modulating the antidiuretic response to vasopressin. Studies were performed in rabbits on a normal diet and in desoxycorticosterone acetate (DOCA)- or KCl-loaded animals. In the state of mineralocorticoid excess, basal prostaglandin synthesis was 63% lower, and vasopressin-stimulated prostaglandin synthesis 76% lower, than the synthesis observed in rabbits on a normal diet. Cyclooxygenase inhibition exposed a significant hydroosmotic response to a submaximal dose of vasopressin in CCT from DOCA- or KCl-loaded animals. With arachidonic acid in the bath, the same dose of vasopressin failed to elicit a hydroosmotic response in CCT from rabbits on a normal diet even in the presence of a cyclooxygenase inhibitor. However, removal of exogenous arachidonic acid, with a consequently lower rate of prostaglandin synthesis, allowed the cyclooxygenase inhibitor to enhance the hydroosmotic response to vasopressin in these tubules.

We conclude from these studies that the rabbit CCT has the capacity to synthesize all of the major prostaglandins and that the rate of synthesis of these lipids is enhanced by vasopessin. Prostaglandin synthesis by the CCT is postulated to modulate the antidiuretic action of vasopressin via a closed feedback loop. The effectiveness of this feedback regulation is dependent upon the mineralocorticoid status of the animal, which determines the level of basal and vasopressin-stimulated prostaglandin synthesis by the CCT.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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