| Autor: |
Woodruff ER; Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309., Chun LE; Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309., Hinds LR; Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309., Varra NM; Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309., Tirado D; Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309., Morton SJ; Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309., McClung CA; Department of Psychiatry, University of Pittsburgh Medical Center, Pittsburgh, PA 15219., Spencer RL; Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309. |
| Abstrakt: |
Post-traumatic stress disorder (PTSD) is associated with impaired conditioned fear extinction learning, a ventromedial prefrontal cortex (vmPFC)-dependent process. PTSD is also associated with dysregulation of vmPFC, circadian, and glucocorticoid hormone function. Rats have rhythmic clock gene expression in the vmPFC that requires appropriate diurnal circulatory patterns of corticosterone (CORT), suggesting the presence of CORT-entrained intrinsic circadian clock function within the PFC. We examined the role of vmPFC clock gene expression and its interaction with CORT profiles in regulation of auditory conditioned fear extinction learning. Extinction learning and recall were examined in male rats trained and tested either in the night (active phase) or in the day (inactive phase). Using a viral vector strategy, Per1 and Per2 clock gene expression were selectively knocked down within the vmPFC. Circulating CORT profiles were manipulated via adrenalectomy (ADX) ± diurnal and acute CORT replacement. Rats trained and tested during the night exhibited superior conditioned fear extinction recall that was absent in rats that had knock-down of vmPFC clock gene expression. Similarly, the superior nighttime extinction recall was absent in ADX rats, but restored in ADX rats given a combination of a diurnal pattern of CORT and acute elevation of CORT during the postextinction training consolidation period. Thus, conditioned fear extinction learning is regulated in a diurnal fashion that requires normal vmPFC clock gene expression and a combination of circadian and training-associated CORT. Strategic manipulation of these factors may enhance the therapeutic outcome of conditioned fear extinction related treatments in the clinical setting. |
