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The Journal of Neuroscience, July 15, 2001, 21(14):5297-5303
The cAMP-Protein Kinase A Signal Transduction Pathway
Modulates Ethanol Consumption and Sedative Effects of Ethanol
Gary
Wand1, 2,
Michael
Levine1, 3,
Larry
Zweifel1,
William
Schwindinger5, and
Ted
Abel4
Departments of 1 Medicine, 2 Psychiatry,
and 3 Pediatrics, The Johns Hopkins University School of
Medicine, Baltimore, Maryland 21205, 4 Department of
Biology, University of Pennsylvania, Philadelphia, Pennsylvania
19104, and 5 Weis Center for Research, The Geisinger
Clinic, Danbury, Pennsylvania 17822
Ethanol and other drugs of abuse modulate cAMP-PKA signaling
within the mesolimbic reward pathway. To understand the role of the
cAMP-PKA signal transduction in mediating the effects of ethanol, we
have studied ethanol consumption and the sedative effects of ethanol in
three lines of genetically modified mice. We report that mice with the
targeted disruption of one Gs allele as well as mice with reduced
neuronal PKA activity have decreased alcohol consumption compared with
their wild-type littermates. Genetic reduction of cAMP-PKA signaling
also makes mice more sensitive to the sedative effects of ethanol,
although plasma ethanol concentrations are unaffected. In contrast,
mice with increased adenylyl cyclase activity resulting from the
transgenic expression of a constitutively active form of Gs in
neurons within the forebrain are less sensitive to the sedative effects
of ethanol. Thus, the cAMP-PKA signal transduction pathway is critical
in modulating sensitivity to the sedative effects of ethanol as well as
influencing alcohol consumption.
Key words:
alcohol; sedation; adenylyl cyclase; protein kinase A; cAMP; alcoholism
Copyright © 2001 Society for Neuroscience 0270-6474/01/21145297-07$05.00/0
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