C-344T polymorphism of the aldosterone synthase gene and blood pressure in the elderly: a population-based study.

Abstract:

OBJECTIVES:Whether the C-344T polymorphism of the aldosterone synthase gene is important for blood pressure control remains controversial. It has been proposed that an association between this polymorphism and blood pressure might be evident in elderly subjects. The aim of the present study was to test this hypothesis in an epidemiological context. DESIGN:A cross-sectional epidemiological evaluation of a highly homogeneous unselected general population of elderly Caucasians. METHODS:Lifestyle, medical history, anthropometrics, skinfold thickness, supine blood pressure, heart rate and biochemical measures were recorded in 437 subjects aged > or = 65 years living in a secluded valley. All were genotyped for C-344T allele status and underwent measurements of plasma aldosterone and renin. RESULTS:The C-344T genotypic frequency did not deviate from Hardy-Weinberg equilibrium. The aldosterone to renin ratio was 19% lower in the CC than in the TT genotype. Systolic blood pressure was significantly lower in subjects with the CC genotype, higher in the TT (+9.6 mmHg versus CC) and intermediate in the CT (+7.9 mmHg versus CC). Adjustment for age, gender, smoking and antihypertensive treatment did not affect this association. Diastolic blood pressure did not differ across genotypes. A significant increase of systolic blood pressure with increasing age and with increasing skinfold thickness was observed in the TT homozygotes but not in the C-carriers. CONCLUSIONS:These data support the concept that the C-344T polymorphism plays a role in controlling systolic blood pressure and the age-related increase in systolic blood pressure in response to age and to body fat, possibly through differences in modulation of aldosterone synthesis.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Casiglia E,Tikhonoff V,Mazza A,Rynkiewicz A,Limon J,Caffi S,Guglielmi F,Martini B,Basso G,Winnicki M,Pessina AC,Somers VK

doi

10.1097/01.hjh.0000183119.92455.a7

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

1991-6

issue

11

eissn

0263-6352

issn

1473-5598

pii

00004872-200511000-00012

journal_volume

23

pub_type

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