Neuropharmacological actions of cigarette smoke: brain monoamine oxidase B (MAO B) inhibition

Journal of Addictive Diseases
Joanna S. FowlerI Zezulkova

Abstract

We measured the concentration of brain monoamine oxidase B (MAO B; EC 1.4.3.4) in 8 smokers and compared it with that in 8 non-smokers and in 4 former smokers using positron emission tomography (PET) and deuterium substituted [11C]L-deprenyl ([11C]L-deprenyl-D2) as a radiotracer for MAO B. Smokers had significantly lower brain MAO B than non-smokers as measured by the model term lambda k3 which is a function of MAO B activity. Reductions were observed in all brain regions. Low brain MAO B in the cigarette smoker appears to be a pharmacological rather than a genetic effect since former smokers did not differ from non-smokers. Brain MAO B inhibition by cigarette smoke is of relevance in light of the inverse association between smoking and Parkinson's disease and a high prevalence of smoking in psychiatric disorders and in substance abuse. Though nicotine is at the core of the neuropharmacological actions of tobacco smoke, MAO B inhibition may also be an important variable in understanding and treating tobacco smoke addiction.

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