Cannabinoids desensitize capsaicin and mustard oil responses in sensory neurons via TRPA1 activation

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

Although the cannabinoid agonists R-(+)-(2,3-dihydro-5-methyl-3-[(4- morpholinyl)methyl]pyrol[1,2,3-de]-1,4-benzoxazin-6-yl)-(1-naphthalenyl) methanone mesylate [WIN 55,212-2 (WIN)] and (R,S)-3-(2-iodo-5-nitrobenzoyl)-1- (1-methyl-2-piperidinylmethyl)-1H-indole (AM1241) exert peripheral antihyperalgesia in inflammatory pain models, the mechanism for cannabinoid-induced inhibition of nociceptive sensory neurons has not been fully studied. Because TRPV1 and TRPA1 channels play important roles in controlling hyperalgesia in inflammatory pain models, we investigated their modulation by WIN and AM1241. The applications of WIN (>5 μM) and AM1241 (>30 μM) inhibit responses of sensory neurons to capsaicin and mustard oil. To determine potential mechanisms for the inhibition, we evaluated cannabinoid effects on nociceptors. WIN and AM1241 excite sensory neurons in a concentration-dependent manner via a nonselective Ca2+-permeable channel. The expression of TRP channels in CHO cells demonstrates that both WIN and AM1241 activate TRPA1 and, by doing so, attenuate capsaicin and mustard oil responses. Using TRPA1-specific small interfering RNA or TRPA1-deficient mice, we show that the TRPA1 channel is a sole target through which WIN and mustard oil activate sensory neurons. In contrast, AM1241 activation of sensory neurons is mediated by TRPA1 and an unknown channel. The knockdown of TRPA1 activity in neurons completely eliminates the desensitizing effects of WIN and AM1241 on capsaicin-activated currents. Furthermore, the WIN- or AM1241-induced inhibition of capsaicin-evoked nocifensive behavior via peripheral actions is reversed in TRPA1 null-mutant mice. Together, this study demonstrates that certain cannabinoids exert their peripheral antinocifensive actions via activation of the TRPA1 channel on sensory neurons.

Original languageEnglish (US)
Pages (from-to)1064-1075
Number of pages12
JournalJournal of Neuroscience
Volume28
Issue number5
DOIs
StatePublished - Jan 30 2008

Fingerprint

Cannabinoids
Capsaicin
Sensory Receptor Cells
Nociceptors
Cannabinoid Receptor Agonists
Pain
Mesylates
AM 1241
mustard oil
CHO Cells
Hyperalgesia
Small Interfering RNA
Neurons

Keywords

  • Cannabinoid
  • Nociceptor
  • Pain
  • Trigeminal
  • TRPA1
  • TRPV1

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Cannabinoids desensitize capsaicin and mustard oil responses in sensory neurons via TRPA1 activation. / Akopian, Armen N; Ruparel, Nikita B; Patwardhan, Amol; Hargreaves, Kenneth M.

In: Journal of Neuroscience, Vol. 28, No. 5, 30.01.2008, p. 1064-1075.

Research output: Contribution to journalArticle

@article{d0ddd60c01614c5c966ffb6184ef5b57,
title = "Cannabinoids desensitize capsaicin and mustard oil responses in sensory neurons via TRPA1 activation",
abstract = "Although the cannabinoid agonists R-(+)-(2,3-dihydro-5-methyl-3-[(4- morpholinyl)methyl]pyrol[1,2,3-de]-1,4-benzoxazin-6-yl)-(1-naphthalenyl) methanone mesylate [WIN 55,212-2 (WIN)] and (R,S)-3-(2-iodo-5-nitrobenzoyl)-1- (1-methyl-2-piperidinylmethyl)-1H-indole (AM1241) exert peripheral antihyperalgesia in inflammatory pain models, the mechanism for cannabinoid-induced inhibition of nociceptive sensory neurons has not been fully studied. Because TRPV1 and TRPA1 channels play important roles in controlling hyperalgesia in inflammatory pain models, we investigated their modulation by WIN and AM1241. The applications of WIN (>5 μM) and AM1241 (>30 μM) inhibit responses of sensory neurons to capsaicin and mustard oil. To determine potential mechanisms for the inhibition, we evaluated cannabinoid effects on nociceptors. WIN and AM1241 excite sensory neurons in a concentration-dependent manner via a nonselective Ca2+-permeable channel. The expression of TRP channels in CHO cells demonstrates that both WIN and AM1241 activate TRPA1 and, by doing so, attenuate capsaicin and mustard oil responses. Using TRPA1-specific small interfering RNA or TRPA1-deficient mice, we show that the TRPA1 channel is a sole target through which WIN and mustard oil activate sensory neurons. In contrast, AM1241 activation of sensory neurons is mediated by TRPA1 and an unknown channel. The knockdown of TRPA1 activity in neurons completely eliminates the desensitizing effects of WIN and AM1241 on capsaicin-activated currents. Furthermore, the WIN- or AM1241-induced inhibition of capsaicin-evoked nocifensive behavior via peripheral actions is reversed in TRPA1 null-mutant mice. Together, this study demonstrates that certain cannabinoids exert their peripheral antinocifensive actions via activation of the TRPA1 channel on sensory neurons.",
keywords = "Cannabinoid, Nociceptor, Pain, Trigeminal, TRPA1, TRPV1",
author = "Akopian, {Armen N} and Ruparel, {Nikita B} and Amol Patwardhan and Hargreaves, {Kenneth M}",
year = "2008",
month = "1",
day = "30",
doi = "10.1523/JNEUROSCI.1565-06.2008",
language = "English (US)",
volume = "28",
pages = "1064--1075",
journal = "Journal of Neuroscience",
issn = "0270-6474",
publisher = "Society for Neuroscience",
number = "5",

}

TY - JOUR

T1 - Cannabinoids desensitize capsaicin and mustard oil responses in sensory neurons via TRPA1 activation

AU - Akopian, Armen N

AU - Ruparel, Nikita B

AU - Patwardhan, Amol

AU - Hargreaves, Kenneth M

PY - 2008/1/30

Y1 - 2008/1/30

N2 - Although the cannabinoid agonists R-(+)-(2,3-dihydro-5-methyl-3-[(4- morpholinyl)methyl]pyrol[1,2,3-de]-1,4-benzoxazin-6-yl)-(1-naphthalenyl) methanone mesylate [WIN 55,212-2 (WIN)] and (R,S)-3-(2-iodo-5-nitrobenzoyl)-1- (1-methyl-2-piperidinylmethyl)-1H-indole (AM1241) exert peripheral antihyperalgesia in inflammatory pain models, the mechanism for cannabinoid-induced inhibition of nociceptive sensory neurons has not been fully studied. Because TRPV1 and TRPA1 channels play important roles in controlling hyperalgesia in inflammatory pain models, we investigated their modulation by WIN and AM1241. The applications of WIN (>5 μM) and AM1241 (>30 μM) inhibit responses of sensory neurons to capsaicin and mustard oil. To determine potential mechanisms for the inhibition, we evaluated cannabinoid effects on nociceptors. WIN and AM1241 excite sensory neurons in a concentration-dependent manner via a nonselective Ca2+-permeable channel. The expression of TRP channels in CHO cells demonstrates that both WIN and AM1241 activate TRPA1 and, by doing so, attenuate capsaicin and mustard oil responses. Using TRPA1-specific small interfering RNA or TRPA1-deficient mice, we show that the TRPA1 channel is a sole target through which WIN and mustard oil activate sensory neurons. In contrast, AM1241 activation of sensory neurons is mediated by TRPA1 and an unknown channel. The knockdown of TRPA1 activity in neurons completely eliminates the desensitizing effects of WIN and AM1241 on capsaicin-activated currents. Furthermore, the WIN- or AM1241-induced inhibition of capsaicin-evoked nocifensive behavior via peripheral actions is reversed in TRPA1 null-mutant mice. Together, this study demonstrates that certain cannabinoids exert their peripheral antinocifensive actions via activation of the TRPA1 channel on sensory neurons.

AB - Although the cannabinoid agonists R-(+)-(2,3-dihydro-5-methyl-3-[(4- morpholinyl)methyl]pyrol[1,2,3-de]-1,4-benzoxazin-6-yl)-(1-naphthalenyl) methanone mesylate [WIN 55,212-2 (WIN)] and (R,S)-3-(2-iodo-5-nitrobenzoyl)-1- (1-methyl-2-piperidinylmethyl)-1H-indole (AM1241) exert peripheral antihyperalgesia in inflammatory pain models, the mechanism for cannabinoid-induced inhibition of nociceptive sensory neurons has not been fully studied. Because TRPV1 and TRPA1 channels play important roles in controlling hyperalgesia in inflammatory pain models, we investigated their modulation by WIN and AM1241. The applications of WIN (>5 μM) and AM1241 (>30 μM) inhibit responses of sensory neurons to capsaicin and mustard oil. To determine potential mechanisms for the inhibition, we evaluated cannabinoid effects on nociceptors. WIN and AM1241 excite sensory neurons in a concentration-dependent manner via a nonselective Ca2+-permeable channel. The expression of TRP channels in CHO cells demonstrates that both WIN and AM1241 activate TRPA1 and, by doing so, attenuate capsaicin and mustard oil responses. Using TRPA1-specific small interfering RNA or TRPA1-deficient mice, we show that the TRPA1 channel is a sole target through which WIN and mustard oil activate sensory neurons. In contrast, AM1241 activation of sensory neurons is mediated by TRPA1 and an unknown channel. The knockdown of TRPA1 activity in neurons completely eliminates the desensitizing effects of WIN and AM1241 on capsaicin-activated currents. Furthermore, the WIN- or AM1241-induced inhibition of capsaicin-evoked nocifensive behavior via peripheral actions is reversed in TRPA1 null-mutant mice. Together, this study demonstrates that certain cannabinoids exert their peripheral antinocifensive actions via activation of the TRPA1 channel on sensory neurons.

KW - Cannabinoid

KW - Nociceptor

KW - Pain

KW - Trigeminal

KW - TRPA1

KW - TRPV1

UR - http://www.scopus.com/inward/record.url?scp=38749149923&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38749149923&partnerID=8YFLogxK

U2 - 10.1523/JNEUROSCI.1565-06.2008

DO - 10.1523/JNEUROSCI.1565-06.2008

M3 - Article

VL - 28

SP - 1064

EP - 1075

JO - Journal of Neuroscience

JF - Journal of Neuroscience

SN - 0270-6474

IS - 5

ER -