Griffing GT, Melby JC, Holbrook M, Wilson T, Azar S, Delaney M, Weiss S. Elevated 18-hydroxy-corticosterone in inbred salt-sensitive rats.
CLINICAL AND EXPERIMENTAL HYPERTENSION. PART A, THEORY AND PRACTICE 1991;
13:371-82. [PMID:
1893610 DOI:
10.3109/10641969109045057]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Rats susceptible to the hypertensive effect of dietary salt (SS/Jr) have excess 18-hydroxydeoxycorticosterone (18-OH-DOC) and 19-nor-DOC compared to control rats (SR/Jr). This may be caused by an abnormal adrenal 11 beta-hydroxylase, which catalyzes the 11 beta, 18, and 19-hydroxylations of DOC. A comparison of the urinary products of this enzyme including 18-OH-DOC, 19-nor-DOC, corticosterone (B), and 18-OH-B have not been described in the SS/Jr. Therefore, these steroid products were measured at 7 and 12 weeks of age in 36 weanling male and female, SS/Jr and SR/Jr (n = 9 in each group), on a low-salt diet. In both the male and female SS/Jr urinary free levels of 18-OH-DOC, 19-nor-DOC, and 18-OH-B were elevated, while B was not different at 6 and 10 weeks of age. The largest increases were in 18-OH-B levels, and these levels correlated with 18-OH-DOC and B but not 19-nor-DOC. The high degree of correlation between these steroids probably reflects their closely related dependence on adrenal 11 beta-hydroxylase biosynthesis.
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