A Functional variant of the iNOS gene flanking region is associated with LAD coronary artery disease: an autopsy study
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 ex...
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Published in | European journal of clinical investigation Vol. 33; no. 12; pp. 1032 - 1037 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford, UK
Blackwell Publishing Ltd
01.12.2003
Blackwell |
Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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Bibliography: | ark:/67375/WNG-PW03HMZ1-F ArticleID:ECI1271 istex:E5DE7D2D2461B638E6862FD7F7A42BFA0FD39E54 Department of Medical Biochemistry (T. A. Kunnas, S. T. Nikkari) and Department of Forensic Medicine (J. Mikkelsson, E. Ilveskoski, P. J. Karhunen), Medical School, University of Tampere; Tampere University Hospital (T. A. Kunnas, J. Mikkelsson, E. Ilveskoski, M. M. Tanner, P. Laippala, S. T. Nikkari, P. J. Karhunen); Laboratory of Cancer Genetics, Institute of Medical Technology (M. M. Tanner) and School of Public Health (P. Laippala), University of Tampere; Department of Forensic Medicine, University of Helsinki, Helsinki (A. Penttilä); Department of Human Molecular Genetics, National Public Health Institute, Helsinki (M. Perola), Finland. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0014-2972 1365-2362 |
DOI: | 10.1111/j.1365-2362.2003.01271.x |