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Methamphetamine-enhanced embryonic oxidative DNA damage and neurodevelopmental deficits
Winnie Jeng1, Andrea W Wong, Ryan Ting-A-Kee
1Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada.
Free Radical Biology & Medicine
|July 5, 2005
Summary
Prenatal methamphetamine exposure causes oxidative DNA damage in the developing brain. This leads to long-term motor deficits in offspring, distinct from adult neurodegeneration.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Methamphetamine (METH) is known to cause neurodegeneration in adults.
- The effects of METH on brain development and fetal exposure are not well understood.
Purpose of the Study:
- To investigate METH-induced oxidative DNA damage in the embryonic and fetal brain.
- To determine the long-term histological and functional consequences of prenatal METH exposure in offspring.
Main Methods:
- Pregnant mice received METH or saline on gestational days 14 or 17.
- Oxidative DNA damage was assessed via 8-oxoguanine formation.
- Postnatal motor function was evaluated using rotarod tests and striatal dopaminergic terminals were stained for tyrosine hydroxylase.
Main Results:
- METH exposure significantly increased oxidative DNA damage in fetal brains and livers.
- Offspring exposed prenatally to METH exhibited impaired motor coordination for at least 12 weeks.
- Unlike adult METH neurotoxicity, prenatal exposure did not result in dopaminergic nerve terminal degeneration in offspring.
Conclusions:
- This study provides the first evidence of amphetamine-induced oxidative DNA damage in the embryonic and fetal brain.
- Prenatal METH exposure leads to persistent postnatal neurodevelopmental deficits.
- The mechanism of METH neurotoxicity during development differs from that in adults, suggesting a novel in utero pathological pathway.