Opioidergic and adrenergic modulation of formalin-evoked spinal c-fos mRNA expression and nocifensive behavior in the rat.

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 Pharmacol

authors

Sawamura S,Fujinaga M,Kingery WS,Belanger N,Davies MF,Maze M

doi

10.1016/s0014-2999(99)00463-x

keywords:

subject

Has Abstract

pub_date

1999-08-27 00:00:00

pages

141-9

issue

2-3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(99)00463-X

journal_volume

379

pub_type

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