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The effects of the clinically tested NMDA receptor antagonist memantine on carrageenan-induced thermal hyperalgesia in rats.

Abstract
This study tested the prophylactic and the therapeutic efficacy of memantine (1-amino-3,5-dimethyl-amandate), a clinically tested N-methyl-D-aspartate (NMDA) receptor antagonist, in suppressing carrageenan-induced thermal hyperalgesia in rats. Rats were injected with 0.1 ml of 1% carrageenan solution s.c. into the right hindpaw, and exhibited hyperalgesia in the injected paw as evidenced by a significant reduction of withdrawal latencies from baseline 1, 3, 5, and 24 h following carrageenan. Prophylactic injection of memantine, 10 and 15 mg/kg, significantly suppressed the hyperalgesia 1, 3, and 5 h post-carrageenan, with maximal effects of 70% (10 mg/kg) and 90% (15 mg/kg) at 1 h post-carrageenan. Therapeutic injection of 10 mg/kg of memantine (2.5 h post-carrageenan) had no effect. The 15 mg/kg dose produced a small effect (peak of 44%) at 3.5 h but not at a statistically significant level, and had no effect 5 h post-carrageenan. This study provides evidence that memantine produces primarily a prophylactic effect (and has only a tendency to produce a therapeutic effect) on carrageenan-induced hyperalgesia at doses that do not significantly alter other motor behaviors.
AuthorsE Eisenberg, S LaCross, A M Strassman
JournalEuropean journal of pharmacology (Eur J Pharmacol) Vol. 255 Issue 1-3 Pg. 123-9 (Apr 01 1994) ISSN: 0014-2999 [Print] Netherlands
PMID8026538 (Publication Type: Journal Article)
Chemical References
  • Receptors, N-Methyl-D-Aspartate
  • Carrageenan
  • Memantine
Topics
  • Animals
  • Behavior, Animal (drug effects)
  • Carrageenan
  • Hot Temperature
  • Hyperalgesia (chemically induced, drug therapy, prevention & control)
  • Male
  • Memantine (therapeutic use)
  • Pain Measurement (drug effects)
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, N-Methyl-D-Aspartate (antagonists & inhibitors)

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