Interleukin-18 levels are not associated with subclinical carotid atherosclerosis in a community population: The Perth Carotid Ultrasound Disease Assessment Study (CUDAS)

C.M.L. Chapman, Brendan Mcquillan, J.P. Beilby, Peter Thompson, Joe Hung

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Abstract

Interleukin (IL)-18 is a novel proinflammatory cytokine that plays a central role in innate and acquired immunity, making it a likely inflammatory candidate in atherosclerosis. We investigated whether circulating IL-18 levels were associated with subclinical atherosclerosis in a community population. Carotid intimal medial thickness (IMT) and carotid plaques were assessed in a cross-sectional study of 1111 randomly selected community subjects, aged 27–77 years. Baseline levels of IL-18, IL-6, high sensitive CRP (hsCRP), fibrinogen and white cell counts were measured along with conventional cardiovascular risk factors. Men had higher mean IL-18 levels than women (P <0.0001). Spearman rank correlations (rs) showed that IL-18 was weakly correlated with all inflammatory markers in the whole population (rs between 0.11 and 0.23, all P <0.001). IL-18 was also correlated with conventional risk factors including waist–hip ratio, BMI, blood pressure, triglycerides, HDL (inversely) and pack-years smoking (rs between 0.18 and 0.39, all P <0.001) but not with LDL-cholesterol. Independent predictors of IL-18 concentrations were waist–hip ratio, HDL, IL-6, hsCRP and hypertension. There was a positive univariate association of IL-18 levels with carotid IMT (P <0.001) and plaque prevalence (P <0.001) but no residual association after adjustment for conventional risk factors (both P > 0.05). In a cross-sectional community population, IL-18 levels were related to traditional risk factors and inflammatory markers but were not independently associated with subclinical carotid atherosclerosis.
Original languageEnglish
Pages (from-to)414 - 419
JournalAtherosclerosis
Volume189
Issue number2
DOIs
Publication statusPublished - 2006

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