Nicotine Patch 'Turns On' Itchy Feeling
New Clues on Itchiness of Nicotine Patch Could Lead to Better Smoking-Cessation Therapies
WebMD News Archive
Sept. 16, 2009 -- If you've tried to quit smoking using nicotine patches or
similar therapies, you might have been left with an itchy feeling.
Such smoking cessation aids commonly cause skin, mouth, and nose irritation.
The side effects often prompt patients to stop using the products.
Now researchers have discovered why nicotine, applied to the skin, leaves
you with the urge to scratch. Their finding could lead to better therapies to
help people stop smoking.
Karel Talavera and colleagues say nicotine turns on a channel in the nervous
system that's involved in the sensation of pain and irritation. This channel,
called TRPA1, is found in the skin and the lining of the nose and mouth. TRPA1
is considered a "chemosensor" because it senses, or detects, certain chemicals,
like nicotine. Their experiments were performed using mice.
Talavera's results challenge the theory that the irritation related to
nicotine patches occurs when the chemical stimulates nerve receptors that send
pain signals from the skin and lining of the nose and mouth.
Their study also revealed that mice lacking TRPA1 had no irritation when
given a nasal version of nicotine.
The study appears in this week's online version of Nature