Document Detail

A functional variant of the iNOS gene flanking region is associated with LAD coronary artery disease: an autopsy study.
MedLine Citation:
PMID:  14636285     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Recent studies using reporter gene constructs have indicated significant differences in the promoter activity of inducible nitric oxide synthase (iNOS) gene variants. Although the exact role of iNOS in atherogenesis is unclear, it is possible that this variation site may influence the extent of coronary artery disease (CAD).
METHODS: We amplified these (AAAT) repeat variants from the NOS2A gene (denoted iNOS R4 and iNOS R5) from 325 Finnish men included in the Helsinki Sudden Death Study, and studied their association with indices of stenosis and atherosclerosis of the left anterior descending artery (LAD), right coronary artery (RCA) and left circumflex artery (LCX). In order to understand the effect of iNOS genotype on different stages of CAD, our study population was divided into age groups.
RESULTS: In the LAD, the progression of atherosclerosis seemed to be more pronounced in the 4/5 genotype carriers than in those with the 4/4 genotype when the different age groups were compared. More specifically, statistically significant differences between the genotypes were found in the subgroup of men aged > 55 years. In this group, men carrying the rare R4/5 genotype presented higher mean values of stenosis percentages (55% vs. 42%, P = 0.008), larger areas of fatty streaks (10.4% vs. 5.9%; P = 0.01) and complicated lesions (3.5% vs. 1.3%; P = 0.001) compared with the R4/4 carriers. No significant association of iNOS genotypes with stenosis and atherosclerosis of RCA and LCX was found.
CONCLUSIONS: It appears unlikely the R4/5 genotype plays a major role in the pathogenesis of CAD, as it was not associated with stenosis and atherosclerosis in RCA and LCX. However this genotype may have some role in more pronounced CAD, as seen in the LAD.
T A Kunnas; J Mikkelsson; E Ilveskoski; M M Tanner; P Laippala; A Penttilä; M Perola; S T Nikkari; P J Karhunen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of clinical investigation     Volume:  33     ISSN:  0014-2972     ISO Abbreviation:  Eur. J. Clin. Invest.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-11-25     Completed Date:  2004-02-24     Revised Date:  2011-10-27    
Medline Journal Info:
Nlm Unique ID:  0245331     Medline TA:  Eur J Clin Invest     Country:  England    
Other Details:
Languages:  eng     Pagination:  1032-7     Citation Subset:  IM    
University of Tampere, Tampere University Hospital, Tampere, University of Helsinki, Helsinki, Finland.
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MeSH Terms
Age Distribution
Coronary Artery Disease / enzymology,  genetics*,  pathology
Death, Sudden, Cardiac / etiology
Genetic Predisposition to Disease
Middle Aged
Nitric Oxide Synthase / genetics*
Nitric Oxide Synthase Type II
Polymorphism, Genetic*
Prospective Studies
Risk Factors
Reg. No./Substance:
EC protein, human; EC Oxide Synthase; EC Oxide Synthase Type II

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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