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Related Experiment Videos

Naltrexone does not increase brain and body development in rats

B F Petrie1

  • 1Department of Psychology, Red Deer College, Alberta, Canada.

Neurotoxicology and Teratology
|July 1, 1993
PubMed
Summary

Early naltrexone (opioid receptor antagonist) injections did not promote postnatal growth in rats. Long-Evans rats showed reduced growth, while Sprague-Dawley rats showed no significant changes, disconfirming the growth hypothesis.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Pharmacology

Background:

  • Opioid receptors play a role in regulating growth and development.
  • Naltrexone, an opioid receptor antagonist, has been investigated for its potential effects on growth.
  • Early life interventions can have lasting impacts on physiological development.

Purpose of the Study:

  • To investigate the effects of early postnatal opioid receptor blockade on growth in two rat strains.
  • To determine if prolonged naltrexone administration promotes postnatal growth.

Main Methods:

  • Preweanling Long-Evans and Sprague-Dawley rats received daily subcutaneous injections of naltrexone (50 mg/kg) or saline from birth to postnatal day 21.
  • Brain and body weights were measured at the end of the treatment period.

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Main Results:

  • Long-Evans rats treated with naltrexone exhibited significantly lower brain and body weights compared to controls.
  • Sprague-Dawley rats showed no significant differences in brain or body weight between naltrexone and saline groups.
  • These findings indicate strain-dependent effects of early naltrexone exposure.

Conclusions:

  • The hypothesis that prolonged early postnatal opioid receptor blockade enhances growth is disconfirmed.
  • Early naltrexone administration may negatively impact growth in certain rat strains.
  • Developmental outcomes following opioid receptor blockade are influenced by genetic background.