Abstract
Alcohol acts through mechanisms involving the brain neurotransmitter dopamine (DA) with the nucleus accumbens as the key zone for mediating these effects. We evaluated the densities of DA D2/D3 receptors and transporters in the nucleus accumbens and amygdala of post-mortem human brains by using [125l]epidepride and [125I]PE2I as radioligands in whole hemispheric autoradiography of Cloninger type 1 and 2 alcoholics and healthy controls. When compared with controls, the mean binding of [125I]epidepride to DA D2/D3 receptors was 20% lower in the nucleus accumbens and 41% lower in the amygdala, and [125I]PE2I binding to DA transporters in the nucleus accumbens was 39% lower in type 1 alcoholics. These data indicate that dopaminergic functions in these limbic areas may be impaired among type 1 alcoholics, due to the substantially lower number of receptor sites. Our results suggest that such a reduction may result in the chronic overuse of alcohol as an attempt to stimulate DA function.
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Acknowledgements
We thank Pirjo Halonen, MSc for her excellent assistance with the statistical analyses, Professor Jouko Vepsäläinen for providing the β-CIT used in the displacement studies and Kari Karkola, MD, PhD for providing two brains for the study. Radiolabelling of [125I]PE2I was performed under the EUREKA Dopimag-program and was financially supported by TEKES. This study was supported by the Finnish Cultural Foundation of Northern Savo and the Swedish Medical Research council (11640).
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Tupala, E., Hall, H., Bergström, K. et al. Dopamine D2/D3-receptor and transporter densities in nucleus accumbens and amygdala of type 1 and 2 alcoholics. Mol Psychiatry 6, 261–267 (2001). https://doi.org/10.1038/sj.mp.4000859
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DOI: https://doi.org/10.1038/sj.mp.4000859