Associations Between Early-Life Adversity, Ambient Air Pollution, and Telomere Length in Children.

Abstract

Examine the independent associations and interaction between early-life adversity and residential ambient air pollution exposure on relative buccal telomere length (rBTL). Experiences of abuse, neglect, household challenges, and related life events were identified in a cross-sectional sample of children ages 1-11 years (n = 197) using the 17-item Pediatric ACEs and Related Life Event Screener (PEARLS) tool. The PEARLS tool was analyzed both as a total score and across established domains (Maltreatment, Household Challenges, and Social Context). Ground-level fine particulate matter (PM2.5) concentrations were matched to residential locations for the one and twelve months prior to biospecimen collection. We used multivariable linear regression models to examine for independent associations between continuous PM2.5 exposure and PEARLS score/domains with rBTL. Additionally, effect modification by PEARLS scores and domains on associations between PM2.5 exposure and rBTL was examined. Study participants were 47% girls, with mean age = 5.9 years [standard deviation: 3.4] median reported PEARLS score of 2 [interquartile range (IQR): 4], median 12-month prior PM2.5 concentrations of 11.8 μg/m3 [IQR: 2.7], median 1-month prior PM2.5 concentrations of 10.9 μg/m3 [IQR: 5.8], and rBTL of 0.1 [IQR: 0.03]. Mean 12-month prior PM2.5 exposure was inversely associated with rBTL (ß = -0.02, 95% CI: -0.04, -0.01). While reported PEARLS scores and domains were not independently associated with rBTL, we observed a greater decrement in rBTL with increment of average annual PM2.5 as reported Social Context domain items increased (p-interaction<0.05). Our results suggest that adverse Social Context factors may accelerate the association between chronic PM2.5 exposure on telomere shortening during childhood.