Physiological significance of link between polycyclic aromatic hydrocarbons and serum nutritional biomarkers.

It is well-known that exposure to polycyclic aromatic hydrocarbons (PAH) may cause adverse health impacts. However, there are few investigations assessing the association between PAH exposure and the nutritional status of the general population. Thus, the purpose of this investigation was to assess the correlation between PAH metabolites and nutritional biomarkers in the U.S. general population. From the 2003-2006 National Health and Nutrition Examination Survey, 4,545 eligible participants were included in this cross-sectional study. To assess PAH exposure, ten urinary PAH metabolites were measured. Eleven serum nutritional biomarkers including carotenoids and vitamins were measured. The association between PAH metabolites and serum nutritional biomarkers was investigated using multivariate linear regression models. Increased 2-hydroxyfluorene was inversely correlated with elven serum nutritional biomarkers: α-carotene (β = -0.529, p < 0.001), β-cryptoxanthin (β = -0.968, p < 0.001), cis-β carotene (β = -0.149, p < 0.001), lutein and zeaxanthin (β = -1.188, p < 0.001), retinyl palmitate (β = -0.145, p < 0.001), retinyl stearate (β = -0.025, p = 0.006), total lycopene (β = -1.074, p < 0.001), trans-β carotene (β = -2.268, p < 0.001), trans-lycopene (β = -0.466, p < 0.003), retinol (β = -0.694, p = 0.004) and 25-hydroxyvitamin D (β = -1.247, p = 0.007). Increased 3-hydroxyfluorene was inversely correlated with eleven serum nutritional biomarkers: α-carotene (β = -0.740, p < 0.001), β-cryptoxanthin (β = -1.377, p < 0.001), cis-β carotene (β = -0.205, p < 0.001), lutein and zeaxanthin (β = -1.521, p < 0.001), retinyl palmitate (β = -0.209, p < 0.001), retinyl stearate (β = -0.034, p = 0.014), total lycopene (β = -1.20, p = 0.007), trans-β carotene (β = -3.185, p < 0.001), trans-lycopene (β = -0.490, p = 0.039), retinol (β = -1.366, p < 0.001) and 25-hydroxyvitamin D (β = -2.483, p < 0.001). Increased 1-hydroxypyrene was inversely correlated with eight serum nutritional biomarkers: α-carotene (β = -0.601, p = 0.001), β-cryptoxanthin (β = -1.071, p = 0.001), cis-β carotene (β = -0.170, p = 0.001), lutein and zeaxanthin (β = -1.074, p < 0.001), retinyl palmitate (β = -0.214, p = 0.005), retinyl stearate (β = -0.041, p = 0.043), total lycopene (β = -1.664, p = 0.011) and retinol (β = -1.381, p = 0.011). These results demonstrate that PAH exposure is significantly correlated with decreased levels of serum nutritional biomarkers.