| First Author | Swanson AM | Year | 2015 |
| Journal | Neuropsychopharmacology | Volume | 40 |
| Issue | 4 | Pages | 1027-36 |
| PubMed ID | 25348603 | Mgi Jnum | J:232537 |
| Mgi Id | MGI:5779492 | Doi | 10.1038/npp.2014.292 |
| Citation | Swanson AM, et al. (2015) GABAAalpha1-mediated plasticity in the orbitofrontal cortex regulates context-dependent action selection. Neuropsychopharmacology 40(4):1027-36 |
| abstractText | An essential aspect of goal-directed action selection is differentiating between behaviors that are more, or less, likely to be reinforced. Habits, by contrast, are stimulus-elicited behaviors insensitive to action-outcome contingencies and are considered an etiological factor in several neuropsychiatric disorders. Thus, isolating the neuroanatomy and neurobiology of goal-directed action selection on the one hand, and habit formation on the other, is critical. Using in vivo viral-mediated gene silencing, we knocked down Gabra1 in the orbitofrontal prefrontal cortex (oPFC) in mice, decreasing oPFC GABAAalpha1 expression, as well as expression of the synaptic marker PSD-95. Mice expressing Green Fluorescent Protein or Gabra1 knockdown in the adjacent M2 motor cortex served as comparison groups. Using instrumental response training followed by action-outcome contingency degradation, we then found that oPFC GABAAalpha1 deficiency impaired animals' ability to differentiate between actions that were more or less likely to be reinforced, though sensitivity to outcome devaluation and extinction were intact. Meanwhile, M2 GABAAalpha1 deficiency enhanced sensitivity to action-outcome relationships. Behavioral abnormalities following oPFC GABAAalpha1 knockdown were rescued by testing mice in a distinct context relative to that in which they had been initially trained. Together, our findings corroborate evidence that chronic GABAAalpha1 deficiency remodels cortical synapses and suggest that neuroplasticity within the healthy oPFC gates the influence of reward-related contextual stimuli. These stimuli might otherwise promote maladaptive habit-based behavioral response strategies that contribute to-or exacerbate-neuropsychiatric illness. |
