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Postnatal morphine administration alters hippocampal development in rats.

Christopher M Traudt1, Ivan Tkac, Kathleen M Ennis

  • 1Department of Pediatrics, Division of Neonatology, University of Minnesota, Minneapolis, Minnesota, USA. ctraudt@uw.edu

Journal of Neuroscience Research
|October 6, 2011
PubMed
Summary

Neonatal morphine exposure in rats alters brain development, decreasing neurogenesis and changing hippocampal neurochemistry. This suggests potential long-term effects of early opioid use on the developing brain.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Pharmacology

Background:

  • Morphine is a common analgesic and sedative for preterm infants.
  • Adult morphine exposure impacts the hippocampus, affecting neurochemistry and neurogenesis.
  • The effects of neonatal morphine exposure on the developing hippocampus are not well understood.

Purpose of the Study:

  • To investigate the impact of neonatal morphine administration on the developing rat hippocampus.
  • To assess neurochemical changes, gene expression, and cell division in the hippocampus following early-life morphine exposure.

Main Methods:

  • Rat pups received daily morphine injections from postnatal days 3-7.
  • Hippocampal neurochemistry was analyzed using in vivo (1)H NMR spectroscopy.

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  • mRNA and protein levels, and cell proliferation (bromodeoxyuridine) in the dentate gyrus were measured.

    • Main Results:

    • Morphine exposure altered hippocampal concentrations of GABA, taurine, myo-inositol, glutathione, phosphoethanolamine, and choline-containing compounds.
    • Decreased glutamic acid decarboxylase enzyme and myelin basic protein mRNA were observed.
    • A significant 60-70% reduction in dentate gyrus cell division was found in morphine-exposed rats.

    Conclusions:

    • Recurrent morphine administration during early brain development alters hippocampal structure and neurochemistry.
    • Neonatal morphine exposure significantly impairs neurogenesis in the dentate gyrus.
    • These findings highlight potential risks associated with early opioid exposure during critical developmental periods.