Molecular variants of the thiazide-sensitive Na+-Cl- cotransporter in hypertensive families.

Abstract:

BACKGROUND:The thiazide-sensitive Na-Cl cotransporter (TSC) is involved in the fine regulation of sodium excretion by the kidney, and an increase in its activity causes salt-sensitive hypertension and hypercalciuria. METHODS:To explore the possibility that activating mutations in the TSC gene may be involved in the pathogenesis of primary hypertension, we screened genomic DNA of 68 individuals from hypertensive families of patients with hypercalciuria for variations using single-strand conformation polymorphism and investigated the functional properties using the Xenopus laevis oocyte expression system. RESULTS:We identified 18 variants in the TSC and, of those, four were nonsynonymous. The A728T, R904Q and R919C variants were introduced into the human TSC cDNA and expressed in Xenopus oocytes to study their effect on Na transport. Although T728 and Q904 did not show any difference in Na uptake, the R919C mutant showed a 60% increase compared to wild-type human TSC and an exaggerated inhibitory action of hydrochlorothiazide. Immunocytochemical analysis revealed no difference in cell surface expression of R919C mutants compared to wild-type hTSC. There was no significant difference in the inhibitory effect of the carboxyl terminus of the serine-threonine kinase WNK4 on the R919C mutant and wild-type hTSC. CONCLUSIONS:Our results show that the substitution of arginine for cysteine at position 919 of TSC increases Na transport function, and provide support for the hypothesis that mutations in renal tubular sodium transporters may contribute to the development of primary hypertension, a polygenic disorder, by increasing renal sodium reabsorption.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Keszei AP,Tislér A,Backx PH,Andrulis IL,Bull SB,Logan AG

doi

10.1097/HJH.0b013e3282a9be1b

subject

Has Abstract

pub_date

2007-10-01 00:00:00

pages

2074-81

issue

10

eissn

0263-6352

issn

1473-5598

pii

00004872-200710000-00017

journal_volume

25

pub_type

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