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Vol. 61, Issue 6, 1453-1464, June 2002
Division of Molecular Psychiatry, Departments of Psychiatry and
Pharmacology, Yale University School of Medicine and Connecticut Mental
Health Center, New Haven, Connecticut (N.S., J.T., S.S.N., J.C.,
M.B.K., R.S.D.); and Department of Psychiatry, the University of Texas
Southwestern Medical Center, Dallas, Texas (C.S., E.J.N.)
To investigate the role of cAMP response element-binding protein (CREB)
in the adaptive responses to psychotropic drugs, we have developed
inducible, brain region-specific CREB transgenic mice using the
tetracycline-regulated gene expression system. The tetracycline
transactivator (tTA) was placed under the control of 1.8-kilobase
neuron-specific enolase (NSE) promoter for this purpose. Different
patterns of CREB overexpression were found in striatum, nucleus
accumbens, and cingulate cortex in different lines of bitransgenic
mice, and CREB expression was blocked by addition of doxycycline, an
analog of tetracycline. Overexpression of CREB influenced the
expression of other members of the CREB/ATF family of transcription
factors, consistent with previous reports. In addition, psychostimulant
induction of dynorphin, a neuropeptide regulated by drugs of abuse, was
up-regulated in striatum. Finally, there was a significant reduction in
cocaine-induced locomotor activity in the CREB bitransgenic mice. These
results are consistent with a role for CREB in mediating adaptive
changes that occur in response to drugs of abuse.
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