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Related Experiment Videos

Haloperidol and apomorphine differentially affect neuropeptidase activity

S M Waters1, C S Konkoy, T P Davis

  • 1Department of Pharmacology, College of Medicine, University of Arizona Health Sciences Center, Tucson, USA.

The Journal of Pharmacology and Experimental Therapeutics
|April 1, 1996
PubMed
Summary

Neuroleptic drugs like haloperidol and dopamine agonists such as apomorphine alter neuropeptidase activity in rat brains. These changes in aminopeptidase N and other enzymes may influence neuropeptide levels and dopamine signaling.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • Neuroleptic drugs impact dopamine receptors and neuropeptide metabolism.
  • Understanding these interactions is crucial for psychiatric drug development.

Purpose of the Study:

  • To investigate the effects of haloperidol and apomorphine on neuropeptidase activity in rat brain regions.
  • To correlate these enzymatic changes with potential alterations in neuropeptide degradation and dopamine activity.

Main Methods:

  • Acute and subchronic administration of haloperidol and apomorphine to rats.
  • Assay of neuropeptidase activity (aminopeptidase N, neutral endopeptidase 24.11, metalloendopeptidase 24.15, angiotensin converting enzyme) in rat brain P2 membranes.

Main Results:

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  • Subchronic haloperidol decreased aminopeptidase N and neutral endopeptidase 24.11 in the frontal cortex and caudate-putamen.
  • Subchronic apomorphine increased aminopeptidase N but decreased neutral endopeptidase 24.11 in the frontal cortex and caudate-putamen.
  • Acute haloperidol and apomorphine showed differential effects on metalloendopeptidase 24.15, with no subchronic effects.

Conclusions:

  • Neuroleptic-induced changes in neuropeptidase activity (aminopeptidase N, neutral endopeptidase 24.11, metalloendopeptidase 24.15) may explain altered neuropeptide degradation.
  • These enzymatic alterations could play a role in modulating midbrain dopaminergic activity due to interactions with neuropeptides.