Epidural Dexamethasone Decreased Inflammatory Hyperalgesia and Spinal cPLA2 Expression in a Rat Formalin Test
Yonsei Medical Journal
;
: 1631-1639, 2014.
Artículo
en Inglés
| WPRIM
| ID: wpr-180232
ABSTRACT
PURPOSE:
The aim of this study was to investigate the effect of epidural dexamethasone on analgesia and cytosolic phospholipase A2 (cPLA2) expression in the spinal cord in a rat formalin test. MATERIALS ANDMETHODS:
Epidural dexamethasone injection was performed to Sprague-Dawley rats with a 25 gauge needle under fluoroscopy. Following the epidural injection, a formalin induced pain behavior test was performed. Next, the spinal cords corresponding to L4 dorsal root ganglion was extracted to observe the cPLA2 expression.RESULTS:
There were no differences in pain response during phase I among the groups. The phase II pain response in 300 microg of epidural dexamethasone group decreased as compared to control, 30 microg of epidural dexamethasone, 100 microg of epidural dexamethasone, and 300 microg of systemic dexamethasone groups. The expression of cPLA2 decreased in Rexed laminae I-II in 300 microg of the epidural dexamethasone group compared with the ones in the control group.CONCLUSION:
Taken together, these results suggest that 300 microg of epidural dexamethasone has an attenuating effect on the peripheral inflammatory tissue injury induced hyperalgesia and this effect is mediated through the inhibition of intraspinal cPLA2 expression and the primary site of action is the laminae I-II of the spinal cord.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Dolor
/
Médula Espinal
/
Inyecciones Epidurales
/
Dimensión del Dolor
/
Dexametasona
/
Ratas Sprague-Dawley
/
Fosfolipasas A2 Grupo IV
/
Formaldehído
/
Hiperalgesia
/
Antiinflamatorios
Límite:
Animales
Idioma:
Inglés
Revista:
Yonsei Medical Journal
Año:
2014
Tipo del documento:
Artículo
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