Drug-Induced Apoptosis: Mechanism by which Alcohol and Many Other Drugs Can Disrupt Brain Development

Area of Science:

• Neuroscience
• Developmental Biology
• Toxicology

Background:

• Fetal Alcohol Spectrum Disorder (FASD) is linked to maternal alcohol consumption during pregnancy.
• Alcohol exposure can cause craniofacial malformations and brain structural pathology.
• Neurobehavioral disorders are a primary manifestation of FASD, even without physical malformations.

Purpose of the Study:

• To review evidence on alcohol's mechanism in causing neurodevelopmental disturbances in FASD.
• To investigate if other common medications share similar neurotoxic pathways.
• To propose a unified mechanism for alcohol, anesthetic, and anti-epileptic drug-induced neurodevelopmental disabilities.

Main Methods:

• Review of animal studies (including non-human primates) on alcohol exposure during gestation.
• Examination of evidence linking general anesthetics (GAs) and anti-epileptics (AEDs) to neurotoxicity.
• Analysis of human epidemiological data on children exposed to GAs or AEDs.

Main Results:

• Alcohol exposure in animals triggers widespread apoptotic death of neurons and oligodendroglia (OLs) in the developing brain.
• This cell death correlates with reduced brain mass and long-term neurobehavioral deficits.
• GAs and AEDs also induce similar apoptotic cell death in animal models and are associated with FASD-like neurobehavioral issues in exposed human children.

Conclusions:

• Alcohol, GAs, and AEDs can cause FASD-like neurodevelopmental disabilities by inducing apoptotic death of developing brain cells.
• The mechanism involves triggering the apoptosis pathway in neurons and oligodendroglia (or their precursors).
• Further research is needed to understand and prevent the apoptosis-triggering mechanisms of these agents.