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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The type 1 equilibrative nucleoside transporter regulates ethanol intoxication and preference.

Adenosine is an important mediator of ethanol intoxication. In vitro, ethanol stimulates adenosine signaling by inhibiting the type 1 equilibrative nucleoside transporter (ENT1), whereas chronic ethanol exposure downregulates ENT1. It is not known, however, whether ENT1 is important for ethanol intoxication or consumption in vivo. Here we report that ENT1-null mice show reduced hypnotic and ataxic responses to ethanol and greater consumption of alcohol as compared with their wild-type littermates. These features are associated with a decrease in adenosine tone, as measured indirectly as a reduction in A(1) receptor-mediated inhibition of glutamate excitatory postsynaptic currents (EPSCs) in the nucleus accumbens, leading to increased phosphorylation of CRE-binding protein (CREB) in the striatum. Treatment with an A(1) receptor agonist decreases EPSC amplitude and reduces ethanol consumption in ENT1-null mice. Our results indicate that ENT1 has a physiological role in ethanol-mediated behaviors and suggest that decreased A(1) adenosine receptor function promotes alcohol consumption.[1]


  1. The type 1 equilibrative nucleoside transporter regulates ethanol intoxication and preference. Choi, D.S., Cascini, M.G., Mailliard, W., Young, H., Paredes, P., McMahon, T., Diamond, I., Bonci, A., Messing, R.O. Nat. Neurosci. (2004) [Pubmed]
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