Visualization of the cortical dopamine transporter in type 1 and 2 alcoholics with human whole hemisphere autoradiography.

We measured cortical dopamine transporter (DAT) in Cloninger type 1 and 2 alcoholics by using [(125)I]PE2I as a radioligand in human postmortem whole hemispheric autoradiography, and evaluated the putative correlations of DAT between cortical areas and nucleus accumbens. There was a low, but distinct cortical binding in the cryosections. The mean binding was generally higher in both groups of alcoholics compared to controls, and the results reached statistical significance with a large effect size (1.25) in the temporal cortex of type 2 alcoholics. This is surprising, because several studies have reported lower DAT densities in the striatum among alcoholics compared to controls. Moreover, the density of DAT had a statistically significant positive correlation between temporal cortex and nucleus accumbens in controls, whereas among type 2 alcoholics the correlation was statistically significantly negative, which may suggest some pathology relating to the antisocial behaviour of these alcoholics.