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- W2916928045 abstract "Purpose There is evidence that cyclic adenosine monophosphate (cAMP) transduction is involved in nociceptive processing. We previously showed that intrathecal injection of an adenylate cyclase inhibitor attenuated tactile allodynia caused by partial sciatic nerve ligation (PSNL) in rats. The present study investigates the pre-emptive effects of spinal cAMP transduction on nociceptive processing in a chronic neuropathic pain model. Methods Intrathecal catheterization and PSNL were performed in male Sprague-Dawley rats. Nociceptive responses to mechanical and thermal stimuli were evaluated at the hindpaw at 2 hr and at 3, 7, and 14 days after PSNL. The pre-emptive effects of the intrathecal adenylate cyclase inhibitor, SQ22536 (0.7 lmol L -1 , 30 min before or after nerve ligation) were assessed. Also, the spatial and temporal expression profiles and immunoreactivity in the spinal cord of the cAMP response element binding protein (CREB) and its phosphorylated proteins (CREB-IR and pCREB-IR) were analyzed. Results Compared with the rats treated with the vehicle, allodynia and hyperalgesia were significantly attenuated at 1‐3 days by the intrathecal injection of SQ22536 performed either before or after ligation. The expression of CREB was significantly higher after ligation (P 0.05), but differences were not observed between groups. Intrathecal injection of SQ22536, either before or after ligation, partially reduced p-CREB-IR protein expression in comparison with the vehicle control, especially after the first 3 days (P 0.05). Conclusion Our results show a possible association between the increase in p-CREB and PSNL-induced neuropathic pain. However, a pre-emptive effect of adenylate cyclase inhibitor administered before surgery was not observed." @default.
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- W2916928045 date "2009-01-01" @default.
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- W2916928045 title "Adenylate cyclase inhibition attenuates neuropathic pain but lacks pre-emptive effects in rats L'inhibition de l'adenylcyclase attenue la douleur neuropathique mais n'a pas d'effets preventifs chez le rat" @default.
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