Pasadena, Calif.--A tiny genetic mutation is the key to understanding why nicotine--which binds to brain receptors with such addictive potency--is virtually powerless in muscle cells that are studded with the same type of receptor. That's according to California Institute of Technology (Caltech) researchers, who report their findings in the March 26 issue of the journal Nature.
By all rights, nicotine ought to paralyze or even kill us, explains Dennis Dougherty, the George Grant Hoag Professor of Chemistry at Caltech and one of the leaders of the research team. After all, the receptor it binds to in the brain's neurons--a type of acetylcholine receptor, which also binds the neurotransmitter acetylcholine--is found in large numbers in muscle cells. Were nicotine to bind with those cells, it would cause muscles to contract with such force that the response would likely prove lethal.
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