Inhibition of cAMP response element-binding protein or dynorphin
in the nucleus accumbens produces an antidepressant-like effect

by
Newton SS, Thome J, Wallace TL, Shirayama Y, Schlesinger L,
Sakai N, Chen J, Neve R, Nestler EJ, Duman RS.
Division of Molecular Psychiatry,
Abraham Ribicoff Research Facilities,
Connecticut Mental Health Center,
Yale University School of Medicine, New Haven,
Connecticut 06508, USA.
J Neurosci 2002 Dec 15;22(24):10883-90


ABSTRACT

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.
Dynorphin and depression
Cannabis: humans are not rats
Adenosine and the nucleus accumbens
Depression, dopamine and dextroamphetamine
Mesolimbic medium spiny neurons and pleasure
Regulation of synapses in the nucleus accumbens
Caffeine, dopamine/glutamate release in shell of NAc
GABA, opiates, happiness and the nucleus accumbens


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