Journal
CURRENT BIOLOGY
Volume 15, Issue 10, Pages 929-934Publisher
CELL PRESS
DOI: 10.1016/j.cub.2005.04.018
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Funding
- NINDS NIH HHS [NS046303, NS42822, NS04910] Funding Source: Medline
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Garlic's pungent flavor has made it a popular ingredient in cuisines around the world and throughout history. Garlic's health benefits have been elevated from folklore to clinical study [1-5]. Although there is some controversy as to the efficacy of garlic, garlic products are one of the most popular herbal supplements in the U.S. [6]. Chemically complex, garlic contains different assortments of sulfur compounds depending on whether the cloves are intact, crushed, cooked, or raw [7]. Raw garlic, when cut and placed on the tongue or lips, elicits painful burning and prickling sensations through unknown mechanisms. Here, we show that raw but not baked garlic activates TRPA1 and TRPV1, two temperature-activated ion channels that belong to the transient receptor potential (TRP) family [8-12]. These thermoTRPs are present in the pain-sensing neurons that innervate the mouth. We further show that allicin, an unstable component of fresh garlic, is the chemical responsible for TRPA1 and TRPV1 activation and is therefore likely to cause garlic's pungency.
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