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Role of the 11beta-hydroxysteroid dehydrogenase type 2 in blood pressure regulation.

Abstract：

:The renal 11beta-hydroxysteroid dehydrogenase type 2 (11betaHSD2) enzyme inactivates 11-hydroxy steroids in the kidney, thus protecting the nonselective mineralocorticoid receptor (MR) from occupation by glucocorticoids. The gene is highly expressed in all sodium-transporting epithelia, but also in human placenta, pancreas, and thyroid. Mutations in the HSD11B2 gene cause a rare monogenic juvenile hypertensive syndrome called apparent mineralocorticoid excess (AME). In AME, compromised 11betaHSD2 enzyme activity results in overstimulation of the MR by cortisol, causing sodium retention, hypokalemia, and salt-dependent hypertension. Recent evidence suggests a role of the 11betaHSD2 in essential hypertension. We found hypertension with no other characteristic signs of AME in the heterozygous father of a child with AME and in a girl with a homozygous gene mutation resulting in a mild deficiency of 11betaHSD2. Moreover, some studies in patients with essential hypertension showed a prolonged half-life of cortisol and an increased ratio of urinary cortisol to cortisone metabolites, suggesting a deficient 11betaHSD2 activity. These abnormalities may be genetically determined. A genetic association of a microsatellite flanking the HSD11B2 gene and hypertension in black patients with end-stage renal disease has been reported. We recently analyzed a CA-repeat allele polymorphism in unselected patients with essential hypertension, but did not find any correlation between this marker and blood pressure. However, we did find an association between this polymorphic CA microsatellite marker and salt sensitivity. Moreover, the activity of the 11betaHSD2, as shown by elevated mean ratios of urinary cortisol to cortisone metabolites, was decreased in salt-sensitive compared with salt-resistant subjects. These findings indicate that variants of the HSD11B2 gene contribute to the enhanced blood pressure response to salt in humans.

journal_name

Kidney Int

journal_title

Kidney international

authors

Ferrari P,Krozowski Z

doi

10.1046/j.1523-1755.2000.00978.x

subject

Has Abstract

pub_date

2000-04-01 00:00:00

pages

1374-81

issue

4

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)46884-X

journal_volume

57

pub_type

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