Vitamin D Status is Linked to Biomarkers of Oxidative Stress, Inflammation, and Endothelial Activation in Obese Children
The Journal of Pediatrics, 06/12/2012

Codoñer–Franch P et al. – Insufficient 25(OH)D levels were detected in severely obese children with increased markers of oxidative/nitrosative stress, inflammation, and endothelial activation.

• Cross-sectional clinical study of 66 obese Caucasian children aged 7 to 14 years.
• Cardiovascular risk factors were assessed.
• Malondialdehyde and myeloperoxidase as measures of oxidative stress, and plasma nitrite+nitrate, urinary nitrate, and 3-nitrotyrosine as markers of nitrosative stress were measured.
• Serum 25-hydroxy-cholecalciferol [25(OH)D], intact parathormone, and calcium-phosphorus levels were determined in these children and in a comparison group of 39 non-obese children.

• Obese children had a significantly lower 25(OH)D level (P = .002) and a higher intact parathormone (P = .011) than non-obese children.
• Phosphorus and the calcium-phosphorus product were also significantly higher (P < .0001).
• Insufficient serum concentrations of 25(OH)D (<20 ng/mL) were detected in 5% of normal children and in 30% of the obese children.
• In the obese children with vitamin D insufficiency, malondialdehyde, myeloperoxidase, 3-nitrotyrosine, interleukin-6, and sVCAM-1 were substantially elevated.