Current Biology
Volume 31, Issue 2, 25 January 2021, Pages 381-393.e4
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Article
Dysfunction of Orbitofrontal GABAergic Interneurons Leads to Impaired Reversal Learning in a Mouse Model of Obsessive-Compulsive Disorder

https://doi.org/10.1016/j.cub.2020.10.045Get rights and content
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Highlights

  • Cell-type-specific activities in the OFC-striatal circuit mediate reversal learning

  • Reduced activity in OFC inhibitory interneurons leads to reversal learning deficits

  • Increased activity in OFC excitatory neurons leads to reversal learning deficits

  • Increased activity in D1-MSNs is causally involved in impaired reversal learning

Summary

Cognitive inflexibility is a cardinal symptom of obsessive-compulsive disorder (OCD) and often manifests as impaired reversal learning. Abnormal recruitment of the orbitofrontal cortex (OFC)-striatal circuit is implicated in reversal learning deficits in patients with OCD. However, the precise circuitry mechanism underlying normal and impaired reversal learning remains elusive. Using fiber photometry and optogenetics, we demonstrated cell-type-specific activity dynamics in the OFC-striatal circuit underlying normal reversal learning and cell-type-specific dysfunctions that causally lead to impaired reversal learning in an OCD mouse model (Sapap3 knockout mice). After contingency reversal, OFC GABAergic interneurons increase the activity in response to previously rewarded but currently non-reward cues to inhibit the elevated activity of OFC excitatory neurons encoding inappropriate cue-reward association. Striatal direct-pathway medium spiny neurons (D1-MSNs) gradually re-establish their response preference for rewarded versus non-reward cues. These activity dynamics together mediated normal reversal learning. In Sapap3 knockout OCD mouse model, the increase in activity of OFC GABAergic interneurons in response to previously rewarded but currently non-reward cues after contingency reversal was reduced, which resulted in insufficient inhibition on OFC excitatory neurons, which in turn led to a more severe inversion of the response preference of D1-MSNs for rewarded versus non-reward cues, ultimately resulting in slower reversal learning. These dysfunctions were causally involved in reversal learning impairments. Our findings identified OFC GABAergic interneurons as the key therapeutic target to treat cognitive inflexibility in OCD and may be generally applicable to cognitive inflexibility in other neuropsychiatric disorders.

Keywords

obsessive-compulsive disorder
OCD
cognitive inflexibility
reversal learning
orbitofrontal cortex
OFC
striatum
neural circuit
fiber photometry
Sapap3

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