Serum cholesterol and vitamins A and E in juvenile chronic arthritis.

Serum total cholesterol is decreased during acute infections and in adults with rheumatoid arthritis, probably partly because of enhanced lipid peroxidation. Oxidative stress also causes augmentation of inflammation and tissue damage in arthritic synovium. Therefore, concentrations of serum total cholesterol and the antioxidant vitamins A and E were studied in 125 children with juvenile chronic arthritis. Total serum cholesterol was significantly lower in the patients than in healthy children in most age groups and correlated with the markers of disease activity, haemoglobin and the erythrocyte sedimentation rate. In age- and sex-adjusted stepwise multiple linear regression, serum zinc had a significant predictive value for cholesterol. The vitamin A concentrations in the sera of the patients was virtually the same as in the healthy controls, though serum vitamin E concentrations were low (22.8 +/- 15.2 vs 30.5 +/- 4.3 mumol/l, p less than 0.001). The deficiency in vitamin E was not compensated for by another lipoperoxide antioxidant, glutathione peroxidase. Only serum cholesterol had an independent explanatory significance for vitamin E in multiple linear regression analysis (partial correlation 0.554, p less than 0.001). It is suggested that low vitamin E and impairment of the anti-oxidant protection further contribute to low serum cholesterol values in JCA.