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Tritiated 18-hydroxydeoxycorticosterone: Binding in renal, cardiac and hepatic cytoplasm, and in plasma from adrenalectomized rats

Authors
Journal
Journal of Steroid Biochemistry
0022-4731
Publisher
Elsevier
Publication Date
Volume
7
Issue
9
Identifiers
DOI: 10.1016/0022-4731(76)90064-9
Disciplines
  • Biology

Abstract

Abstract Hypersecretion of 18-hydroxydeoxycorticosterone (18-OHDOC) may be implicated in some cases of low renin hypertension and in salt-sensitive hypertension in Dahl rats. To investigate the mechanism of action of the steroid, the binding of tritiated 18-OHDOC was studied in cytoplasmic fractions of kidney, liver and heart. Binding was displaceable by excess unlabelled 18-OHDOC, but to sites with affinity too low for a physiological role as 18-OHDOC receptors. Similarly, no specific high affinity plasma binding protein could be demonstrated ; by equilibrium dialysis, high capacity albumin binding was shown to be ~65%. The weak mineralocorticoid effects of 18-OHDOC would therefore appear to be mediated by occupation of physiological aldosterone receptors, and not by occupation of physiological receptors specific for 18-OHDOC itself.

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