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Maternal morphine alters parvalbumin immunoreactivity patterns in neonatal mouse brain
P Maharajan1, R Prencipe, P Di Francesco
1CNR Institute of Cybernetics, Arco Felice, Naples, Italy.
Synapse (New York, N.Y.)
|February 5, 2000
Summary
Maternal morphine exposure alters parvalbumin expression in neonatal mouse brains, increasing parvalbumin-positive neurons and dendrites in specific cortical regions. This may underlie behavioral deficits in maternally addicted neonates.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Chronic maternal opioid use can impact fetal development.
- Parvalbumin is a key calcium-binding protein in fast-spiking interneurons, crucial for brain function.
- Understanding developmental neurotoxicity of opioids is critical.
Purpose of the Study:
- To investigate the effects of chronic maternal morphine administration on parvalbumin immunoreactivity in the developing mouse brain.
- To correlate observed neurochemical changes with potential behavioral alterations in offspring.
Main Methods:
- Female Swiss mice received daily morphine or saline before and during gestation and lactation.
- Pups were analyzed on postnatal day 18 using histological and immunohistochemical techniques.
- Quantification of parvalbumin-positive neurons and dendrites in specific brain regions.
Main Results:
- No significant changes in overall neonatal forebrain cell numbers were observed.
- A notable increase in parvalbumin-positive neurons was found in parietal cortex layers II-IV.
- Significant increases in parvalbumin-positive dendrites were observed in the cingulate and parietal cortices.
Conclusions:
- Chronic maternal morphine exposure induces region-specific alterations in parvalbumin expression in the neonatal mouse brain.
- These changes in parvalbumin immunoreactivity may contribute to the impaired somatosensory and cognitive functions seen in maternally addicted neonates.
- Alterations in parvalbumin expression represent a potential cellular mechanism by which addictive drugs affect the developing central nervous system.