Ectopic G-protein expression in dopamine and serotonin neurons blocks cocaine sensitization in Drosophila melanogaster

Li, H, Chaney, S, Roberts, I J H, Forte, M and Hirsh, J (2000) Ectopic G-protein expression in dopamine and serotonin neurons blocks cocaine sensitization in Drosophila melanogaster. Current Biology, 10 (4). pp. 211-214. ISSN 0960-9822

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Abstract

Sensitization to repeated doses of psychostimulants is thought to be an important component underlying the addictive process in humans. In all vertebrate animal models, including humans, and even in fruit flies, sensitization is observed after repeated exposure to volatilized crack cocaine. In vertebrates, sensitization is thought to be initiated by processes occurring in brain regions that contain dopamine cell bodies. Here, we show that modulated cell signaling in the Drosophila dopamine and serotonin neurons plays an essential role in cocaine sensitization. Targeted expression of either a stimulatory (Gαs) or inhibitory (Gαi) Gα subunit, or tetanus toxin light chain (TNT) in dopamine and serotonin neurons of living flies blocked behavioral sensitization to repeated cocaine exposures. These flies showed alterations in their initial cocaine responsiveness that correlated with compensatory adaptations of postsynaptic receptor sensitivity. Finally, repeated drug stimulation of a nerve cord preparation that is postsynaptic to the brain amine cells failed to induce sensitization, further showing the importance of presynaptic modulation in sensitization.

Item Type: Article
Additional Information: Sussex author mistakenly excluded from original article, correction by journal here: http://dx.doi.org/10.1016/S0960-9822(00)00501-7
Schools and Departments: School of Life Sciences > Biology and Environmental Science
Depositing User: Ian Roberts
Date Deposited: 06 Feb 2012 21:14
Last Modified: 30 Jul 2012 11:55
URI: http://sro.sussex.ac.uk/id/eprint/30405
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