Abstract |
The present study was undertaken to investigate whether celecoxib could regulate the tetrodotoxin-resistant (TTX-R) sodium channel current in rat dorsal root ganglia (DRG) and whether prostaglandin E2 ( PGE2) and calcitonin gene-related protein (CGRP) were involved in celecoxib's analgesia during acute incisional pain. Seventy-five rats were randomly allocated into three groups. Group A was the control group receiving a placebo ( sugar pill) 1 h before and 12 h after surgery (right hind paw incisional pain). Group B was the test group receiving celecoxib 30 mg/kg orally 1 h before and 12 h after surgery. Group C was the naive group receiving a sham operation. The changes in the mechanical withdrawal thresholds, PGE2 and CGRP concentration in incisional paw tissue and DRG, and total TTX-R sodium channel current density in small DRG neurons were investigated 1 h before the operation and 2 h, 6 h, 12 h, 24 h, 48 h and 96 h after the operation. The results showed both of a decrease in mechanical withdrawal thresholds and an increase of TTX-R sodium channel current density in DRG neurons in group B were significantly lower than those of group A at 24 h and 48 h after the operation (P<0.05). The increase in PGE2 and CGRP concentrations at incisional paw tissue and DRG neurons in group B were lower than those of groups A at 24 h and 48 h after the operation (P<0.05). This study indicates that: 1) celecoxib can inhibit TTX-R sodium channel current density in rat DRG neurons; 2) PGE2 and CGRP participate in celecoxib's analgesic effect on acute incisional pain.
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Authors | Ke Ma, Quan-Hong Zhou, Jin Chen, Dong-Ping Du, Yonghua Ji, Wei Jiang |
Journal | Brain research
(Brain Res)
Vol. 1209
Pg. 57-64
(May 13 2008)
ISSN: 0006-8993 [Print] Netherlands |
PMID | 18400213
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Anti-Inflammatory Agents, Non-Steroidal
- Biomarkers
- Pyrazoles
- Sodium Channels
- Sulfonamides
- tetrodotoxin-binding protein
- Celecoxib
- Calcitonin Gene-Related Peptide
- Dinoprostone
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Topics |
- Animals
- Anti-Inflammatory Agents, Non-Steroidal
(pharmacology, therapeutic use)
- Biomarkers
(analysis, metabolism)
- Calcitonin Gene-Related Peptide
(metabolism)
- Celecoxib
- Cells, Cultured
- Dinoprostone
(metabolism)
- Ganglia, Spinal
(drug effects, metabolism, physiopathology)
- Male
- Neurons, Afferent
(drug effects, metabolism)
- Pain Measurement
- Pain Threshold
(drug effects)
- Pain, Postoperative
(drug therapy, metabolism, physiopathology)
- Physical Stimulation
- Pyrazoles
(pharmacology, therapeutic use)
- Rats
- Rats, Sprague-Dawley
- Sodium Channels
(drug effects, metabolism)
- Sulfonamides
(pharmacology, therapeutic use)
- Time Factors
- Treatment Outcome
- Up-Regulation
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