Literature DB >> 9886751

NMDA receptor activation modulates evoked release of substance P from rat spinal cord.

M Malcangio1, K Fernandes, D R Tomlinson.   

Abstract

The possible modulation exerted by glutamate on substance P (SP) release from the rat spinal cord has been investigated. The N-methyl-D-aspartate (NMDA) receptor agonist, NMDA (1 microM), increased SP basal outflow by 46.5+/-10.9% (n = 3, P<0.01) without changing the evoked release of the peptide. Conversely, NMDA antagonists but not 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) inhibited both electrically-evoked and capsaicin-induced release of SP. In particular, D-2-amino-5-phosphonopentanoate (D-AP5; 50 microM) inhibited electrically-evoked and capsaicin-induced release of SP by 93+/-2.4% and 93.2+/-3.8% (n = 12, P<0.01), respectively. Functional pharmacological evidence is provided for glutamate exerting a positive feedback on SP release evoked by C fibre stimulation via NMDA receptor activation.

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Year:  1998        PMID： 9886751      PMCID： PMC1565764          DOI： 10.1038/sj.bjp.0702260

Source DB:  PubMed          Journal:  Br J Pharmacol        ISSN： 0007-1188            Impact factor:   8.739


  22 in total

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