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The Journal of Neuroscience, December 15, 2002, 22(24):10883-10890
Inhibition of cAMP Response Element-Binding Protein or Dynorphin in the Nucleus Accumbens Produces an Antidepressant-Like Effect
Samuel S. Newton1, Johannes Thome1, Tanya L. Wallace1, Yukihikko Shirayama1, Lee Schlesinger1, Norio Sakai1, Jingshan Chen1, Rachael Neve2, Eric J. Nestler3, and Ronald S. Duman1 1 Division of Molecular Psychiatry, Abraham Ribicoff Research Facilities, Connecticut Mental Health Center, Yale University School of Medicine, New Haven, Connecticut 06508, 2 McLean Hospital, Harvard University, Belmont, Massachusetts 02478, and 3 Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, Texas 75390
The cAMP response element-binding protein (CREB) is a critical integrator of neural plasticity that is responsive in a brain region-specific manner to a variety of environmental and pharmacological stimuli, including widely prescribed antidepressant medications. We developed inducible transgenic lines of mice that express either CREB or a dominant-negative mutant of CREB (mCREB) in forebrain regions and used these mice to determine the functional significance of this transcription factor in the learned helplessness paradigm, a behavioral model of depression. We also use a complementary viral-mediated gene transfer approach to directly test the effect of mCREB in the nucleus accumbens, a brain region important for motivation and reward. The results demonstrate that blockade of CREB by overexpression of mCREB in transgenic mice or by viral expression of mCREB in the nucleus accumbens produces an antidepressant-like effect, whereas overexpression of CREB in transgenic mice results in the opposite phenotype. In addition, mCREB expression was colocalized with and decreased the expression of prodynorphin in nucleus accumbens medium spiny neurons, and antagonism of dynorphin in the nucleus accumbens was sufficient to produce an antidepressant-like effect similar to that observed after blockade of CREB. Together, the results demonstrate that nucleus accumbens CREB-dynorphin influence behavior in the learned helplessness model and suggest that this signaling cascade may contribute to symptoms of depression.
Key words: learned helplessness; dysphoria; depression; prodynorphin;
-opiate receptors; behavior
Copyright © 2002 Society for Neuroscience 0270-6474/02/222410883-08$05.00/0
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