Association between urinary phthalate metabolites and renal function in late pregnant women

Evidence about associations of phthalates metabolites with increased serum uric acid (SUA) levels in pregnant women remains unknown. To address this, we conducted a cross-sectional population-based study including 851 pregnant women from Zunyi birth cohort in southwest China. Multiple linear regression models were used to explore single relationships between ten urinary phthalate metabolites with SUA and estimated glomerular filtration rate (eGFR). And then, the overall relationship of phthalate mixture with SUA and eGFR were determined by principal component analysis (PCA) and quantile g-computation (Q-g) analysis. The multivariable linear regression showed that mono-butyl phthalate (MBP), mono-octyl phthalate (MOP) and mono-benzyl phthalate (MBzP) were positively associated with SUA, while mono (2-ethylhexyl) phthalate (MEHP) and mono (2-ethyl-5-hydroxyhexyl) phthalate (MEHHP) were associated with increased eGFR level. Moreover, PCA analysis suggested that phthalate mixture was positively associated with SUA, and MOP, MBzP and MEHP appeared to be the major contributors. Furthermore, Q-g regression showed that each quantile increase in phthalate mixture was associated with 3.27% higher SUA (95% CI 0.21%, 6.41%). Our results imply that phthalate metabolites were associated with higher SUA in late pregnant women, and MBP, MBzP and MOP might be the major drivers. So, a health perinatal duration should be seriously taken to counteract the environment-related dysregulated kidney function.