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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ferreira, Sérgio Henrique Parada, Carlos Amilcar Vivancos, Gustavo Gameiro Cunha, Fernando De Queiróz Tambeli, Claudia Herrera |
| Description | Author Affiliation: Parada CA ( Department of Pharmacology, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, São Paulo, Brazil.); |
| Abstract | The present study investigated whether activation of presynaptic N-methyl-d-aspartate (NMDA) receptors in the spinal cord produces a retrograde nociceptor sensitization (hypernociception) to mechanical nonnoxious stimulus. By using an electronic version of the von Frey hair test (pressure meter), s.c. intraplantar administration of prostaglandin E(2) (PGE(2)) (50-400 ng per paw) evoked a dose-related ipsilateral paw hypernociception. In contrast, intrathecal (i.t.) administration of NMDA (5-80 ng) and PGE(2) (15-150 ng) evoked dose-related bilateral paw hypernociception. The s.c. intraplantar administration of dipyrone (80-320 microg per paw) or morphine (3 and 9 microg per paw), usually used to antagonize peripheral PGE(2) (100 ng per paw), induced hypernociception and also antagonized the ipsilateral (without affecting the contralateral) paw hypernociception induced by i.t. injections of NMDA (40 ng) or PGE(2) (50 ng). These doses of drugs did not modify the basal mechanical sensitivity of control paws. This result shows that intraspinal NMDA or PGE(2) produces sensitization of the primary sensory neuron in response to mechanical stimulation. In a second series of experiments it was shown that the i.t. treatment with NaV1.8 (SNS/PN3) sodium channel antisense oligodeoxynucleotides, but not mismatch oligodeoxynucleotides, decreased the mRNA expression of sodium tetrodotoxin-resistant channels on the dorsal root ganglia and abolished the mechanical hypernociception induced by i.t. administration of NMDA. Thus, our results support the suggestion that glutamate release in the spinal cord during inflammation causes retrograde hypernociception of nociceptors associated with sodium tetrodotoxin-resistant channels in primary nociceptive sensory neurons. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 5 |
| Volume Number | 100 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2003-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Neuropeptides Genetics Physiology Nociceptors Receptors, N-Methyl-D-Aspartate Metabolism Sodium Channels Analgesics, Opioid Pharmacology Animals Anti-Inflammatory Agents, Non-Steroidal Dipyrone Dose-Response Relationship, Drug Ganglia, Spinal Glutamates Inflammation Morphine NAV1.8 Voltage-Gated Sodium Channel Drug Effects Oligonucleotides, Antisense Pain Measurement Polymerase Chain Reaction RNA, Messenger Rats, Wistar Reverse Transcriptase Polymerase Chain Reaction Spinal Cord Time Factors Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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