Association of Low Striatal Dopamine D 2 Receptor Availability With Nicotine Dependence Similar to That Seen With Other Drugs of Abuse

C Fehr, I Yakushev, N Hohmann…�- American Journal of�…, 2008 - Am Psychiatric Assoc
C Fehr, I Yakushev, N Hohmann, HG Buchholz, C Landvogt, H Deckers, A Eberhardt…
American Journal of Psychiatry, 2008Am Psychiatric Assoc
Objective: All drugs of abuse induce a phasic dopamine release within the striatum that does
not undergo habituation. Prolonged substance consumption impairs the natural function of
the mesolimbic dopamine system, as shown by a decrease in the availability of striatal
dopamine 2 (D 2) receptors in patients suffering from cocaine, heroin, amphetamine, and
alcohol dependence. However, it is unclear whether similar changes can also be observed
in heavy-smoking nicotine-dependent smokers. Method: In vivo D 2/D 3 receptor availability�…
Objective
All drugs of abuse induce a phasic dopamine release within the striatum that does not undergo habituation. Prolonged substance consumption impairs the natural function of the mesolimbic dopamine system, as shown by a decrease in the availability of striatal dopamine 2 (D 2 ) receptors in patients suffering from cocaine, heroin, amphetamine, and alcohol dependence. However, it is unclear whether similar changes can also be observed in heavy-smoking nicotine-dependent smokers.
Method
In vivo D 2 /D 3 receptor availability was determined with [ 18 F]fallypride positron emission tomography in 17 heavy-smoking nicotine-dependent subjects and in 21 age-matched never-smoking comparison subjects. The smokers were scanned twice: first, during a period of usual consumption and second, 24 hours after smoking cessation.
Results
Independent of the withdrawal status, the nicotine-dependent smokers displayed significantly less availability of D 2 /D 3 receptors within the bilateral putamen functionally covering parts of the dorsal striatum, as compared to the never-smoking subjects. Nicotine craving under the consumption condition correlated positively with D 2 /D 3 receptor availability within the ventral striatum but negatively with D 2 /D 3 receptor availability within the anterior cingulate and inferior temporal cortex.
Conclusions
Similar to other types of substance abuse, nicotine dependence is associated with low availability of dorsal striatal D 2 /D 3 receptors. In contrast to previous findings on abstinent alcohol-dependent patients, nicotine craving seems to be maintained by a region-specific shift in D 2 /D 3 receptor availabilities, with higher availability within the ventral striatum but lower availability within the anterior cingulate and inferior temporal cortex.
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