期刊
TRANSLATIONAL PSYCHIATRY
卷 11, 期 1, 页码 -出版社
SPRINGERNATURE
DOI: 10.1038/s41398-021-01448-x
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资金
- Sao Paulo Research Foundation (FAPESP, Brazil) [2017/22473-9]
- MnDRIVE Brain Conditions Initiative
- UMN Medical Discovery Team on Addictions
- OneMind Institute
This study aimed to replicate a model of compulsive behavior previously reported in mice in outbred rats, but failed to do so. Although physiological changes in the OFC-VMS circuitry were induced in rats, no compulsive self-grooming or other compulsive behaviors were observed. This suggests possible limitations in translating mouse findings to species higher on the phylogenetic chain.
The orbitofrontal cortex-ventromedial striatum (OFC-VMS) circuitry is widely believed to drive compulsive behavior. Hyperactivating this pathway in inbred mice produces excessive and persistent self-grooming, which has been considered a model for human compulsivity. We aimed to replicate these findings in outbred rats, where there are few reliable compulsivity models. Male Long-Evans rats implanted with optical fibers into VMS and with opsins delivered into OFC received optical stimulation at parameters that produce OFC-VMS plasticity and compulsive grooming in mice. We then evaluated rats for compulsive self-grooming at six timepoints: before, during, immediately after, and 1h after each stimulation, 1 and 2 weeks after the ending of a 6-day stimulation protocol. To further test for effects of OFC-VMS hyperstimulation, we ran animals in three standard compulsivity assays: marble burying, nestlet shredding, and operant attentional set-shifting. OFC-VMS stimulation did not increase self-grooming or induce significant changes in nestlet shredding, marble burying, or set-shifting in rats. Follow-on evoked potential studies verified that the stimulation protocol altered OFC-VMS synaptic weighting. In sum, although we induced physiological changes in the OFC-VMS circuitry, we could not reproduce in a strongly powered study in rats a model of compulsive behavior previously reported in mice. This suggests possible limitations to translation of mouse findings to species higher on the phylogenetic chain.
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