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학술저널
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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제55권 제6호
발행연도
2014.1
수록면
1,631 - 1,639 (9page)

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Purpose: The aim of this study was to investigate the effect of epidural dexamethasoneon analgesia and cytosolic phospholipase A2 (cPLA2) expression in the spinal cord in a rat formalin test. Materials and Methods: Epidural dexamethasone injectionwas 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 μg of epidural dexamethasone group decreased as compared to control, 30 μg of epiduraldexamethasone, 100 μg of epidural dexamethasone, and 300 μg of systemic dexamethasone groups. The expression of cPLA2 decreased in Rexed laminae I‒II in 300 μg of the epidural dexamethasone group compared with the ones in the control group. Conclusion: Taken together, these results suggest that 300 μg 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.

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