Epigenetic modifications associated with pathophysiological effects of lead exposure

Area of Science:

• Environmental toxicology
• Epigenetics
• Developmental biology

Background:

• Lead (Pb) is a developmental toxicant.
• Pb exposure alters epigenetic mechanisms like DNA methylation, histone modifications, miRNAs, and chromatin accessibility.
• These epigenetic changes contribute to Pb's diverse pathophysiological outcomes.

Purpose of the Study:

• To elucidate the role of epigenetic dysregulation in Pb-induced developmental toxicity.
• To detail the neurotoxic and extra-neurotoxic consequences of Pb exposure.
• To highlight the persistent nature of Pb-induced health effects.

Main Methods:

• Review of existing literature on Pb exposure and epigenetic mechanisms.
• Analysis of dose, duration, sex, and tissue-specific effects of Pb.
• Categorization of Pb-induced neurotoxic and extra-neurotoxic outcomes.

Main Results:

• Pb exposure alters DNA methylation, histone modifications, miRNAs, and chromatin accessibility.
• Neurotoxic effects include memory and learning deficits, behavioral disorders, and neurodegenerative diseases.
• Extra-neurotoxic effects encompass metabolic, cardiovascular, hematopoietic, and reproductive impairments.

Conclusions:

• Pb-induced epigenetic alterations are central to its developmental toxicity.
• Pb exposure leads to a spectrum of lifelong neurotoxic and extra-neurotoxic health problems.
• Early-life Pb exposure results in persistent, undesirable health outcomes.