Abstract：
:We previously described a rat model where the injection of formalin in the tail induced a facilitation of the hindpaw withdrawal reflexes (hyperalgesia). In the present work, after injecting formalin in the tail, we measured the levels of pro-nociceptive mediators tumor necrosis factor-alpha (TNF) and substance P (SP) in the rat paws. A significant increase of SP levels was evident in the hindpaw, whereas no changes in SP were observed in the forepaw. Both in the hindpaw and in the forepaw the TNF levels were higher than normal at each stage of measurement. Our results indicate that a prolonged neuronal activation induced by formalin injection is associated with a change in nociceptive and inflammatory mediators in distal sites of the body. The fact that SP levels are changed in the hindpaw but not in the forepaw might point to the activation of a mechanism of retrograde signaling from central synapses to paw afferent nerves.
journal_name
Brain Resjournal_title
Brain researchauthors
Bianchi M,Martucci C,Biella G,Ferrario P,Sacerdote Pdoi
10.1016/j.brainres.2004.06.007subject
Has Abstractpub_date
2004-09-03 00:00:00pages
255-8issue
1-2eissn
0006-8993issn
1872-6240pii
S000689930400945Xjournal_volume
1019pub_type
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