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Published on: July 13, 2014
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Prenatal Alcohol Exposure Inhibits Transient Expression of Autophagy and Synaptic Proteins in Developing Brain
Monica Hampe1, Nune Darbinian1, Nana Merabova1,2
1Center for Neural Development and Repair, Department of Neural Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140, USA.
Obstetrics and Gynecology Research
|March 14, 2025
Summary
Prenatal alcohol exposure harms fetal brain development by inhibiting autophagy and synaptic connections. Reduced miR-9 in exosomes may predict fetal alcohol spectrum disorders (FASD).
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Fetal alcohol spectrum disorders (FASD) involve neuronal apoptosis and autophagy inhibition, impacting synaptic connections.
- Studies on autophagy mechanisms in the human fetal brain are limited.
- Prenatal alcohol exposure (EtOH) is linked to reduced miRNA-9 levels in fetal brain-derived exosomes (FB-Es), correlating with FAS hallmarks.
Purpose of the Study:
- To investigate the molecular mechanisms of autophagy and synaptic plasticity in the context of prenatal EtOH exposure.
- To explore the role of miRNA-9 in EtOH-induced neurodevelopmental alterations.
- To identify potential biomarkers for FASD prediction.
Main Methods:
- Utilized a rat model with EtOH liquid diet and human fetal brain tissues (9-23 weeks GA).
- Assessed EtOH consumption via questionnaire.
- Analyzed expression of 84 synaptic plasticity genes, miRNA-9, and proteins in brain tissue and FB-Es using microarrays, qRT-PCR, droplet digital PCR, qWestern blot, and ELISA.
Main Results:
- EtOH exposure increased pro-apoptotic markers and inhibited anti-apoptotic and autophagy-related genes (e.g., Bag3) in fetal brains.
- Synaptic proteins (synaptophysin, synapsin) and genes involved in Long Term Potentiation/depression were downregulated; TNFα was upregulated.
- Reduced miR-9 targets and synaptic gene expression were observed in FB-Es, mirroring brain tissue findings.
Conclusions:
- Prenatal EtOH exposure disrupts autophagy and synaptic plasticity in fetal brains of rats and humans.
- Dysregulation of GSK3β/β-catenin signaling is implicated.
- Reduced miR-9 target synaptic genes in FB-Es show promise as novel biomarkers for predicting FASD.
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