Abstract:
:Fos protein expression has been used to reflect neuronal activation in pain processing pathways although analgesics may uncouple behavioral and Fos responses. We determine whether formalin-induced spinal c-fos mRNA expression (Northern blotting) correlates with nocifensive behavior following pretreatment with morphine, the alpha2-adrenoceptor agonist dexmedetomidine, or their respective antagonists naloxone and atipamezole. Both opiate and alpha2-adrenoceptor agonists reduced formalin-induced c-fos gene transcription and nocifensive behavior via their cognate receptors. Unexpectedly, blockade of either the opiate or alpha2-adrenergic receptors, alone, caused an increase in formalin-evoked c-fos mRNA; while blocking the opiate receptor had no effect on formalin-induced behavior, alpha2-adrenoceptor block had an analgesic effect, indicating discordance between c-fos message transcription and nocifensive behavior. We concluded that the formalin-induced spinal c-fos signal was a poor predictor of the behavioral response to pharmacological manipulation of pain processing pathways.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Sawamura S,Fujinaga M,Kingery WS,Belanger N,Davies MF,Maze Mdoi
10.1016/s0014-2999(99)00463-xkeywords:
subject
Has Abstractpub_date
1999-08-27 00:00:00pages
141-9issue
2-3eissn
0014-2999issn
1879-0712pii
S0014-2999(99)00463-Xjournal_volume
379pub_type
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