PT - JOURNAL ARTICLE AU - Herbert E. Covington III AU - Mary Kay Lobo AU - Ian Maze AU - Vincent Vialou AU - James M. Hyman AU - Samir Zaman AU - Quincey LaPlant AU - Ezekiel Mouzon AU - Subroto Ghose AU - Carol A. Tamminga AU - Rachael L. Neve AU - Karl Deisseroth AU - Eric J. Nestler TI - Antidepressant Effect of Optogenetic Stimulation of the Medial Prefrontal Cortex AID - 10.1523/JNEUROSCI.1731-10.2010 DP - 2010 Dec 01 TA - The Journal of Neuroscience PG - 16082--16090 VI - 30 IP - 48 4099 - http://www.jneurosci.org/content/30/48/16082.short 4100 - http://www.jneurosci.org/content/30/48/16082.full SO - J. Neurosci.2010 Dec 01; 30 AB - Brain stimulation and imaging studies in humans have highlighted a key role for the prefrontal cortex in clinical depression; however, it remains unknown whether excitation or inhibition of prefrontal cortical neuronal activity is associated with antidepressant responses. Here, we examined cellular indicators of functional activity, including the immediate early genes (IEGs) zif268 (egr1), c-fos, and arc, in the prefrontal cortex of clinically depressed humans obtained postmortem. We also examined these genes in the ventral portion of the medial prefrontal cortex (mPFC) of mice after chronic social defeat stress, a mouse model of depression. In addition, we used viral vectors to overexpress channel rhodopsin 2 (a light-activated cation channel) in mouse mPFC to optogenetically drive “burst” patterns of cortical firing in vivo and examine the behavioral consequences. Prefrontal cortical tissue derived from clinically depressed humans displayed significant reductions in IEG expression, consistent with a deficit in neuronal activity within this brain region. Mice subjected to chronic social defeat stress exhibited similar reductions in levels of IEG expression in mPFC. Interestingly, some of these changes were not observed in defeated mice that escape the deleterious consequences of the stress, i.e., resilient animals. In those mice that expressed a strong depressive-like phenotype, i.e., susceptible animals, optogenetic stimulation of mPFC exerted potent antidepressant-like effects, without affecting general locomotor activity, anxiety-like behaviors, or social memory. These results indicate that the activity of the mPFC is a key determinant of depression-like behavior, as well as antidepressant responses.