Dkk3 is a component of the genetic circuitry regulating aldosterone biosynthesis in the adrenal cortex.

Abstract:

:Primary aldosteronism (PA, autonomous aldosterone production from the adrenal cortex) causes the most common form of secondary arterial hypertension (HT), which is also the most common curable form of HT. Recent studies have highlighted an important role of mutations in genes encoding potassium channels in the pathogenesis of PA, both in human disease and in animal models. Here, we have exploited the unique features of the hyperaldosteronemic phenotype of Kcnk3 null mice, which is dependent on sexual hormones, to identify genes whose expression is modulated in the adrenal gland according to the dynamic hyperaldosteronemic phenotype of those animals. Genetic inactivation of one of the genes identified by our strategy, dickkopf-3 (Dkk3), whose expression is increased by calcium influx into adrenocortical cells, in the Kcnk3 null background results in the extension of the low-renin, potassium-rich diet insensitive hyperaldosteronemic phenotype to the male sex. Compound Kcnk3/Dkk3 animals display an increased expression of Cyp11b2, the rate-limiting enzyme for aldosterone biosynthesis in the adrenal zona glomerulosa (ZG). Our data show that Dkk3 can act as a modifier gene in a mouse model for altered potassium channel function and suggest its potential involvement in human PA syndromes.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

El Wakil A,Bandulik S,Guy N,Bendahhou S,Zennaro MC,Niehrs C,Mari B,Warth R,Barhanin J,Lalli E

doi

10.1093/hmg/dds333

subject

Has Abstract

pub_date

2012-11-15 00:00:00

pages

4922-9

issue

22

eissn

0964-6906

issn

1460-2083

pii

dds333

journal_volume

21

pub_type

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