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NMDA receptor antagonist MK-801 down-regulates rat striatal proenkephalin and protachykinin mRNAs

F Zhang1, L Van Bree, N Albala

  • 1Brain Research Unit and Laboratory of Neuropathology and Neuropeptide Research, Université Libre de Bruxelles, Belgium.

Neurochemistry International
|February 1, 1996
PubMed

Insights

Daily administration of the N-methyl-D-aspartate (NMDA) receptor antagonist MK-801 significantly reduced proenkephalin and protachykinin mRNA expression in the rat caudate-putamen. These findings suggest MK-801 impacts key neuropeptide systems in the brain.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • The N-methyl-D-aspartate (NMDA) receptor is crucial for synaptic plasticity and learning.
  • NMDA receptor antagonists, like MK-801, are used to study glutamatergic neurotransmission.
  • Proenkephalin and protachykinin are neuropeptides involved in various brain functions.

Purpose of the Study:

  • To investigate the effects of chronic MK-801 administration on neuropeptide mRNA expression in the rat brain.
  • To quantify changes in proenkephalin and protachykinin mRNA levels in the caudate-putamen.

Main Methods:

  • Quantitative in situ hybridization was employed to measure mRNA levels.
  • Rats received daily intraperitoneal injections of MK-801 (2 mg/kg) for a specified duration.
  • Gene expression was analyzed in the caudate-putamen region of the brain.

Main Results:

  • A significant decrease in proenkephalin mRNA expression (27.1%) was observed.
  • Protachykinin mRNA expression also showed a significant reduction (20.0%).
  • These changes were evident 14 days after the initiation of MK-801 treatment.

Conclusions:

  • Chronic administration of the NMDA receptor antagonist MK-801 downregulates proenkephalin and protachykinin gene expression in the rat caudate-putamen.
  • These findings highlight the impact of NMDA receptor blockade on endogenous opioid and tachykinin systems.
  • Further research is warranted to understand the functional consequences of these molecular changes.

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