Inflammatory gene load is associated with enhanced inflammation and early carotid atherosclerosis in smokers.
OBJECTIVE
Smoking acts as a pro-inflammatory stimulus. Inflammation may provide a key mechanism by which smoking causes atherosclerosis. If so, then the degree to which an individual mounts an inflammatory response is likely to influence atherosclerosis severity. This study examined the impact of inflammatory gene polymorphisms and gene-smoking interactions on common carotid artery intima-media thickness (IMT), a measure of early atherosclerosis.


METHODS
In a community population (n=1000), mean IMT was determined using ultrasound. This population was genotyped for 6 polymorphisms in 4 inflammatory genes: IL-6-174, IL-6-572, and IL-6-597; IL-1-beta-31; IL-1 receptor antagonist VNTR and CD14-159. Serum IL-6 levels were measured in the first 500 subjects. Genotypes/haplotypes associated with higher IL-6 levels were designated "inflammatory haplotypes." A gene load score was calculated, in which 2 represented individuals homozygous for > or =2 inflammatory genotypes/haplotypes and 0 was homozygous for none.


RESULTS
Increasing gene load of inflammatory genotypes was associated with a linear increase in serum IL-6 levels (P=0.018) and increased carotid artery IMT (P=0.003). There was a significant interaction between gene load and smoking status on carotid IMT (P for interaction=0.002). Specifically, in smokers, carriers of inflammatory haplotypes had significantly increased age- and sex-adjusted IMT (IL-6-174C/IL-6-572G/IL-6-597A, P=0.005; IL-1-beta-31T/IL-1RN*2,P=0.04; CD14-159CC, P=0.028).


CONCLUSIONS
These findings support the hypothesis that inflammation and cytokine responses provide a key mechanism by which smoking causes atherogenesis. Secondly, they highlight the importance of gene-environment, and gene-gene-environment interactions in the pathogenesis of atherosclerosis.
Department of Clinical Neurosciences, St. George's Hospital Medical School, Cranmer Terrace, London SW170RE. pjerrard@sghms.ac.uk
Paula
P
Jerrard-Dunne
Matthias
M
Sitzer
Paul
P
Risley
Alexandra
A
Buehler
Stefan
S
von Kegler
Hugh S
HS
Markus
D000368:Aged; D002340:Carotid Artery Diseases / Q000000981:diagnostic imaging / Q000209:etiology* / Q000235:genetics*; D016207:Cytokines / Q000097:blood / Q000235:genetics*; D005260:Female; D040741:Genetic Load; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000503:physiopathology*; D007375:Interleukin-1 / Q000097:blood / Q000235:genetics; D015850:Interleukin-6 / Q000097:blood / Q000235:genetics; D018950:Lipopolysaccharide Receptors / Q000097:blood / Q000235:genetics; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects* / Q000503:physiopathology; D017539:Tunica Intima / Q000473:pathology; D014463:Ultrasonography
D016207:Cytokines; D007375:Interleukin-1; D015850:Interleukin-6; D018950:Lipopolysaccharide Receptors