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Cytokines are involved in the development of several inflammatory diseases and atherosclerosis. Their variations in healthy individuals are not well defined. The aims of this study were: firstly, to identify factors affecting biological variation of interleukin-6 (IL-6) and tumour necrosis factor-alpha (TNF-alpha); secondly, to study their family resemblance; and thirdly, to evaluate the effect of two TNF-alpha (-308G/A and -238G/A) and two IL-6 polymorphisms (174G/C and -572G/C) on their corresponding circulating levels. A total of 171 healthy families selected from the STANISLAS cohort were studied. Age was negatively related to TNF-alpha concentrations in offspring only (both sons and daughters). Additionally, IL-6 and TNF-alpha levels were differently influenced by gender, white blood cells, tobacco consumption, and HDL-cholesterol level. A weak significant familial resemblance for TNF-alpha concentration was observed in siblings only. There was no significant familial resemblance for IL-6 levels. The TNF-alpha -308A allele was associated with decreased TNF-alpha concentrations in both offspring aged less than 18 and males without overweight (BMI&lt;25 kg/m(2)). Fathers carrying the IL-6 -174CC genotype had higher IL-6 levels than those with the IL-6 -174G allele. Parents with the IL-6 -572GG genotype had higher IL-6 concentrations than the C allele carriers. In this sample of healthy families, plasma levels of IL-6 and TNF-alpha were differently affected by biological parameters including age, gender and smoking, and the impact of their respective polymorphisms was influenced by gender, age and BMI.

Biological variations, genetic polymorphisms and familial resemblance of TNF-α and IL-6 concentrations: STANISLAS cohort