Faculty Opinions recommendation of Learning-facilitated long-term depression requires activation of the immediate early gene, c-fos, and is transcription dependent.

Author(s):  
Karl-Peter Giese
Author(s):  
H.A. Robertson ◽  
M.L. Paul ◽  
R. Moratalla ◽  
A.M. Graybiel

ABSTRACT:Expression of the immediate early gene c-fos is increased in mammalian neurons by a number of stimuli and the usefulness of this gene as a marker of neuronal activation has been demonstrated in several systems. Directlyacting dopamine agonists of the D1-type (SKF 38393, CY 208-243) and indirectly-acting dopamine gonists (amphetamine, cocaine) all produce a rapid and transient increase in Fos protein levels in varying patterns in striatum and cerebral cortex. irectly-acting dopamine agonists only produce c-fos activation in denervated (supersensitive) striatum whereas cocaine and amphetamine activate c-fos in striatum in naive animals. Remarkably, D2 selective antagonists such as haloperidol, albeit in high doses, also activate c-fos expression. Activation of c-fos and other immediate early genes may play a part in the development of such long-term dopamine-related effects as dyskinetic movements and addiction.


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