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Ethanol-mediated alterations in oligodendrocyte differentiation in the developing brain.

Nune Darbinian1, Armine Darbinyan2, Nana Merabova1

  • 1Center for Neural Repair and Rehabilitation (Shriners Hospitals Pediatric Research Center), Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140, United States of America.

Neurobiology of Disease
|November 15, 2020
PubMed
Summary

Prenatal alcohol exposure in humans leads to increased oligodendrocyte apoptosis and delayed maturation, impacting white matter development. This is linked to altered cytokine and chemokine signaling, consistent with animal models of Fetal Alcohol Syndrome (FAS).

Keywords:
AlcoholFASFetal brainNeuronal injuryOligodendrocytes

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Toxicology

Background:

  • Fetal Alcohol Syndrome (FAS) is associated with white matter abnormalities.
  • The molecular mechanisms in human FAS remain unclear, particularly regarding oligodendrocyte precursor cells (OPCs).
  • Rodent models suggest cytokine dysregulation impacts OPCs and oligodendrocyte (OL) differentiation.

Purpose of the Study:

  • To investigate the effects of prenatal ethanol (EtOH) exposure on human fetal brain OPCs and OLs.
  • To determine if molecular changes observed in animal models are present in human FAS.
  • To analyze cytokine and chemokine expression in relation to OL development and apoptosis.

Main Methods:

  • Human fetal brain tissue (12.2-21.4 weeks gestation) from EtOH-exposed and control groups.
  • Quantification of cytokine and OPC marker mRNA using qRT-PCR.
  • Analysis of OPC markers and active caspase-3 protein expression via FACS.

Main Results:

  • EtOH exposure reduced markers of OL differentiation and maturation (e.g., PDGFRα, MBP, IGF-1) but not early markers (e.g., Nkx2.2).
  • Increased expression of pro-inflammatory cytokines (TNFα) and chemokines (GRO-α, IL8, CXCL16, ENA-78, MCP-1) was observed.
  • Increased apoptosis (caspase-3 activation) and a higher proportion of early OPC markers (A2B5, NG2) were noted in EtOH-exposed fetuses.

Conclusions:

  • Prenatal EtOH exposure causes excessive OL apoptosis and/or delayed OL maturation in the human fetal brain.
  • Dysregulated cytokine and chemokine expression patterns suggest increased OL cytotoxicity and impaired differentiation.
  • Findings align with animal models, indicating conserved molecular pathways in human FAS pathogenesis.