Regulation of the 11 beta-hydroxysteroid dehydrogenase in the rat adrenal. Decrease enzymatic activity induced by ACTH.

Abstract:

:Patients with ectopic ACTH syndrome often develop hypertension and hypokalemic alkalosis with an abnormal increase in the ratio of plasma cortisol to cortisone, indicating that 11 beta-hydroxysteroid dehydrogenase (11 beta HSD) activity is inhibited. Inhibition of 11 beta HSD allows access of cortisol or corticosterone to the mineralocorticoid receptor where it act as a mineralocorticoid. Two isozymes, 11 beta HSD-1 and 11 beta HSD-2, have been cloned and characterized. The rat adrenal expresses the mRNAs for 11 beta HSD-2 and, in lesser amounts, 11 beta HSD-1. We investigated the effect of ACTH on the 11 11 beta HSD-2 activity in the rat adrenal. Rat adrenal cells zone fasciculata (ZF) were dispersed and incubated separately with increasing concentrations of ACTH for 90 min, and secretion of corticosterone (B) and 11-dehydrocorticosterone (A) in the media was measured by enzyme-linked immunoabsorbent assays (ELISA). The conversion of [3H]B to [3H]A in the presence of 0.5 mM NAD+ was evaluated in microsomes prepared from dispersed cells preincubated for 30 min with cyanoketone and metyrapone followed by incubation for 30 min with the same inhibitors, with and without 10 nM ACTH. The dispersed cells of the ZF produced significant amounts of A which increased with ACTH. The basal B/A ratio was 0.97 +/- 0.05. ACTH caused a concentration-dependent increase in the ratio of B/A with a maximum ratio of 9.58 +/- 0.20. ACTH also inhibited the conversion of [3H]B to [3H]A in microsomes in which endogenous B production was inhibited by cyanoketone and metyrapone. ACTH did not change the K(m) for B conversion, but the Vmax was reduced significantly (1.73 +/- 0.43 pmol/min. mg protein), indicating that ACTH suppressed the 11 beta HSD-2 in a noncompetitive fashion. Dibutyryl cyclic AMP (dcAMP) also produced a concentration-dependent increase in the B/A ratio, but various concentrations of calcium did not affect the enzyme activity. In summary, adrenal cells treated with ACTH results in a significant increase in the ratio of B/A in the ZF owing a noncompetitive inhibition of the 11 beta HSD-2 via the ACTH receptor.

journal_name

Endocrine

journal_title

Endocrine

authors

Morita H,Cozza EN,Zhou MY,Gomez-Sanchez EP,Romero DG,Gomez-Sanchez CE

doi

10.1007/BF02801327

subject

Has Abstract

pub_date

1997-12-01 00:00:00

pages

331-5

issue

3

eissn

1355-008X

issn

1559-0100

journal_volume

7

pub_type

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