Cannabinoid modulation of cutaneous Adelta nociceptors during inflammation.

Abstract:

:Previous studies have demonstrated that locally administered cannabinoids attenuate allodynia and hyperalgesia through activation of peripheral cannabinoid receptors (CB(1) and CB(2)). However, it is currently unknown if cannabinoids alter the response properties of nociceptors. In the present study, correlative behavioral and in vivo electrophysiological studies were conducted to determine if peripheral administration of the cannabinoid receptor agonists arachidonyl-2'-chloroethylamide (ACEA) or (R)-(+)-methanandamide (methAEA) could attenuate mechanical allodynia and hyperalgesia, and decrease mechanically evoked responses of Adelta nociceptors. Twenty-four hours after intraplantar injection of complete Freund's adjuvant (CFA), rats exhibited allodynia (decrease in paw withdrawal threshold) and hyperalgesia (increase in paw withdrawal frequency), which were attenuated by both ACEA and methAEA. The antinociceptive effects of these cannabinoids were blocked by co-administration with the CB(1) receptor antagonist N-(piperidin-1-yl)-5-(4-iodophenyl)-1-(2,4-dichlorophen yl)-4-methyl-1H-pyrazole-3-carboxamide (AM251) but not with the CB(2) receptor antagonist 6-iodo-2-methyl-1-[2-(4-morpholinyl)ethyl]-1H-indol-3-y l](4-methoxyphenyl)methanone (AM630). ACEA and methAEA did not produce antinociception under control, non-inflamed conditions 24 h after intraplantar injection of saline. In parallel studies, recordings were made from cutaneous Adelta nociceptors from inflamed or control, non-inflamed skin. Both ACEA and methAEA decreased responses evoked by mechanical stimulation of Adelta nociceptors from inflamed skin but not from non-inflamed skin, and this decrease was blocked by administration of the CB(1) receptor antagonist AM251. These results suggest that attenuation of mechanically evoked responses of Adelta nociceptors contributes to the behavioral antinociception produced by activation of peripheral CB(1) receptors during inflammation.

journal_name

J Neurophysiol

authors

Potenzieri C,Brink TS,Pacharinsak C,Simone DA

doi

10.1152/jn.90809.2008

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

2794-806

issue

5

eissn

0022-3077

issn

1522-1598

pii

90809.2008

journal_volume

100

pub_type

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