Pungent products from garlic activate the sensory ion channel TRPA1.

Published

Journal Article

Garlic belongs to the Allium family of plants that produce organosulfur compounds, such as allicin and diallyl disulfide (DADS), which account for their pungency and spicy aroma. Many health benefits have been ascribed to Allium extracts, including hypotensive and vasorelaxant activities. However, the molecular mechanisms underlying these effects remain unknown. Intriguingly, allicin and DADS share structural similarities with allyl isothiocyanate, the pungent ingredient in wasabi and other mustard plants that induces pain and inflammation by activating TRPA1, an excitatory ion channel on primary sensory neurons of the pain pathway. Here we show that allicin and DADS excite an allyl isothiocyanate-sensitive subpopulation of sensory neurons and induce vasodilation by activating capsaicin-sensitive perivascular sensory nerve endings. Moreover, allicin and DADS activate the cloned TRPA1 channel when expressed in heterologous systems. These and other results suggest that garlic excites sensory neurons primarily through activation of TRPA1. Thus different plant genera, including Allium and Brassica, have developed evolutionary convergent strategies that target TRPA1 channels on sensory nerve endings to achieve chemical deterrence.

Full Text

Duke Authors

Cited Authors

  • Bautista, DM; Movahed, P; Hinman, A; Axelsson, HE; Sterner, O; Högestätt, ED; Julius, D; Jordt, S-E; Zygmunt, PM

Published Date

  • August 23, 2005

Published In

Volume / Issue

  • 102 / 34

Start / End Page

  • 12248 - 12252

PubMed ID

  • 16103371

Pubmed Central ID

  • 16103371

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.0505356102

Language

  • eng

Conference Location

  • United States