Chronic haloperidol and chlorpromazine treatment alters in vitro β-endorphin metabolism in rat brain

Pierre N.M. Konings, Alison Culling-Berglund, Thomas P. Davis

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


To determine if chronic haloperidol (3.0 mg/kg per day) or chlorpromazine (4.2 mg/kg per day) treatment alters central β-endorphin metabolism, haloperidol and chlorpromazine were perfused via AlzetTM minipumps into male Sprague-Dawley rats for 8 days. Crude twice-washed membranes, purified synaptic plasma membranes and Golgi-enriched membranes, respectively, were isolated from rat brains and time course incubated with β-endorphin. All samples were analyzed by high resolution, reversed-phase high performance liquid chromatography. The half-lives of β-endorphin for animals treated with haloperidol or chlorpromazine were not statistically different from control animals at the crude washed membranes. At the purified synaptic plasma membranes, however, the half-lives of β-endorphin from haloperidol (t 1 2 = 45.1 min)- and chlorpromazine (t 1 2 = 47.0 min)-treated animals were significantly decreased as compared to the control animals (t 1 2 = 78.0 min). The half-life of β-endorphin at the Golgi-enriched membranes was increased for haloperidol (t 1 2 = 112.3 min) and chlorpromazine (t 1 2 = 103.0 min)-treated animals when compared to control animals (t 1 2 = 80.2 min). The findings indicate a differential effect of the dopamine receptor antagonists haloperidol and chlorpromazine on the extracellular fate at the synaptic plasma membranes of β-endorphin and the intracellular processing at the Golgi-enriched membranes in vitro.

Original languageEnglish (US)
Pages (from-to)115-128
Number of pages14
JournalEuropean Journal of Pharmacology
Issue number2
StatePublished - Nov 27 1990


  • (HPLC)
  • Brain
  • Neuroleptic drugs
  • β-Endorphin
  • β-Endorphin metabolism

ASJC Scopus subject areas

  • Pharmacology


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