Is plasma alpha-tocopherol associated with electronegative LDL in obese adolescents?
2013
Da Silva, I.T. (University of Sao Paulo, Sao Paulo, SP (Brazil). School of Public Health, Department of Nutrition) | Mello, A.P.Q. | Sanches, L.B. | Abdalla, D.S.P. | Damasceno, N.R.T.
Obesity has increased in children and adolescents. What is reflected in the early occurrence of cardiometabolic alterations, like hypertension and type 2 diabetes, where the oxLDL formation is stimulated. Various studies have shown that plasma alpha-tocopherol (alpha-TP) can protect LDL against oxidation. Nevertheless, the action of plasma alpha-TP in cardiovascular diseases remains controversial. We conducted a cross-sectional study to evaluate plasma alpha-TP and its impact on the concentration of LDL(-). Adolescents (n=150) of both sexes were classified into three groups: healthy weight (HW; 50%), overweight (OV; 22%), and obese (OB; 28%). Lipid profile, LDL(-), anti-oxLDL and anti-LDL(-) antibodies, CRP (ELISA) and plasma alpha-TP (HPLC) were analyzed. Demographic, anthropometric, and food intake data were evaluated. Crude and energy-adjusted intake of vitamin E in the OB group were higher than in the HW group (p<0.001). Crude and energy-adjusted vitamin E intakes were not correlated with plasma alpha-TP (r=-0.07; p=0.412 and r=-0.064; p=0.467, respectively). Subjects in the OB group had higher TC and LDL-C and lower HDL-C than in the HW and OV groups. C-reactive protein and anti-oxLDL antibodies changed as a function of BMI. The impact of obesity was reinforced by high values for LDL(-) and low content of plasma alpha-TP in comparison with the HW (p<0.001) and OV groups (p=0.03). This negative profile was maintained for the ratio between alpha-TP and TC or LDL-C. Plasma alpha-TP, alpha-TP/TC and alpha-TP/LDL-C were negatively associated with LDL(-) and other cardiometabolic risk factors (BMI, WC, AC and anti-oxLDL). Our results demonstrate that obesity in adolescents is associated with high levels of LDL(-) and low plasma alpha-TP content.
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