Inhibition of monoamine oxidase B in the brains of smokers.

Abstract:

:The massive health problem associated with cigarette smoking is exacerbated by the addictive properties of tobacco smoke and the limited success of current approaches to cessation of smoking. Yet little is known about the neuropharmacological actions of cigarette smoke that contribute to smoking behaviour, or why smoking is so prevalent in psychiatric disorders and is associated with a decreased risk of Parkinson's disease. Here we report that brains of living smokers show a 40% decrease in the level of monoamine oxidase B (MAO B; EC 1.4.3.4) relative to non-smokers or former smokers. MAO B is involved in the breakdown of dopamine, a neurotransmitter implicated in reinforcing and motivating behaviours as well as movement. MAO B inhibition is therefore associated with enhanced activity of dopamine, as well as with decreased production of hydrogen peroxide, a source of reactive oxygen species. We propose that reduction of MAO B activity may synergize with nicotine to produce the diverse behavioural and epidemiological effects of smoking.

journal_name

Nature

journal_title

Nature

authors

Fowler JS,Volkow ND,Wang GJ,Pappas N,Logan J,MacGregor R,Alexoff D,Shea C,Schlyer D,Wolf AP,Warner D,Zezulkova I,Cilento R

doi

10.1038/379733a0

subject

Has Abstract

pub_date

1996-02-22 00:00:00

pages

733-6

issue

6567

eissn

0028-0836

issn

1476-4687

journal_volume

379

pub_type

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