Age-related differences in the effect of chronic administration of naloxone on opiate binding in rat brain

M. T. Bardo, R. K. Bhatnagar, G. F. Gebhart

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Infant and adult rats were injected chronically with either naloxone or saline for 21 consecutive days. At various intervals after cessation of the pretreatment with naloxone, animals were sacrificed and assessed for specific binding of [3H]naloxone in different regions of the CNS. Infants displayed an increase in opiate binding in the spinal cord, hypothalamus, striatum and cortex one day after cessation of the pretreatment with naloxone, but the increase in opiate binding was dissipated within one week after cessation of the pretreatment. The increase in opiate binding in infants was accompanied by an increase in the antinociceptive efficacy of morphine. In contrast to infants, adults failed to display any alteration in opiate binding following the chronic pretreatment with naloxone. Infants may be especially susceptible to naloxone-induced receptor supersensitivity because infants excrete naloxone more slowly than adults, and thus their opiate receptors may be blocked for a longer duration following an injection of naloxone.

Original languageEnglish
Pages (from-to)453-461
Number of pages9
JournalNeuropharmacology
Volume22
Issue number4
DOIs
StatePublished - Apr 1983

Bibliographical note

Funding Information:
Supported by USPHS grants NS 12121, DA 02879 and DA 05 195.

Keywords

  • CNS development
  • morphine antinociception
  • naloxone
  • opiate receptor

ASJC Scopus subject areas

  • Pharmacology
  • Cellular and Molecular Neuroscience

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