Abstract:
:TRPA1 agonists cinnamaldehyde (CA) and mustard oil (allyl isothiocyanate=AITC) induce heat hyperalgesia and mechanical allodynia in human skin, and sensitize responses of spinal and trigeminal dorsal horn neurons to noxious skin heating in rats. TRPA1 is also implicated in cold nociception. We presently used behavioral methods to investigate if CA affects sensitivity to thermal and mechanical stimuli in rats. Unilateral intraplantar injection of CA (5-20%) induced a significant, concentration-dependent reduction in latency for ipsilateral paw withdrawal from a noxious heat stimulus, peaking (61.7% of pre-injection baseline) by 30 min with partial recovery at 120 min. The highest dose of CA also significantly reduced the contralateral paw withdrawal latency. CA significantly reduced mechanical withdrawal thresholds of the injected paw that peaked sooner (3 min) and was more profound (44.4% of baseline), with no effect contralaterally. Bilateral intraplantar injections of CA resulted in a significant cold hyperalgesia (cold plate test) and a weak enhancement of innocuous cold avoidance (thermal preference test). The data are consistent with roles for TRPA1 in thermal (hot and cold) hyperalgesia and mechanical allodynia.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Tsagareli MG,Tsiklauri N,Zanotto KL,Carstens MI,Klein AH,Sawyer CM,Gurtskaia G,Abzianidze E,Carstens Edoi
10.1016/j.neulet.2010.02.056subject
Has Abstractpub_date
2010-04-12 00:00:00pages
233-6issue
3eissn
0304-3940issn
1872-7972pii
S0304-3940(10)00240-5journal_volume
473pub_type
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