Prenatal exposure to mixed toxic metals and childhood blood pressure: the mediating role of amino acid and carnitine metabolism.

Prenatal arsenic exposure is linked to increased offspring blood pressure through disruptions in carnitine metabolism, with stronger effects from early to mid-pregnancy exposure.

• Why it matters: Understanding how prenatal metal mixtures influence childhood blood pressure is crucial for preventing hypertension and related health issues, yet the mechanisms remain unclear.
• What they did: The study analyzed maternal and cord blood for eight toxic metals in a cohort of 541 pregnancies, using Bayesian kernel machine regression and weighted quantile sum models to identify arsenic as the key contributor, and performed metabolomics to explore underlying pathways.
• The result: Prenatal arsenic exposure was positively associated with offspring systolic blood pressure and mean arterial pressure, mediated by alterations in carnitine homeostasis, especially during early to mid-pregnancy.