Abstract
Recent studies indicate that competitive and non-competitive NMDA receptor antagonists can block the development of morphine tolerance. Since glycine is considered to be a co-agonist for activation of NMDA receptors we examined the effect of a novel bioavailable NMDA receptor/glycine site antagonist, 5-nitro-6,7-dimethyl-1,4-dihydro-2,3-quinoxalinedione (ACEA-1328), on the development of morphine tolerance. Administration of ACEA-1328 (20 mg/kg) completely blocked tolerance to morphine-induced antinociception in the tail flick test in CD-1 mice, without affecting the basal nociceptive response or potentiating morphine-induced antinociceptive effects. These data suggest that inhibition of NMDA receptor activity via blockade of the glycine co-agonist site is potentially viable as a therapeutic approach for preventing development of morphine tolerance.
Original language | English (US) |
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Pages (from-to) | 187-189 |
Number of pages | 3 |
Journal | European Journal of Pharmacology |
Volume | 273 |
Issue number | 1-2 |
DOIs | |
State | Published - Jan 24 1995 |
Keywords
- (CD-1 mouse)
- Morphine tolerance
- NMDA receptor/glycine site antagonist
- Tail flick test
ASJC Scopus subject areas
- Pharmacology