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• W2016430082 abstract "Prefrontal cortex (PFC) dysfunction is common in patients with Huntington's disease (HD), a dominantly inherited neurological disorder, and has been linked to cognitive disruption. We previously reported alterations in neuronal firing patterns recorded from PFC of the R6/2 mouse model of HD. To determine if PFC dysfunction results in behavioral impairments, we evaluated performance of wild-type (WT) and R6/2 mice in a fear conditioning and extinction behavioral task. Fear conditioning and extinction retrieval were similar in both genotypes, but R6/2s exhibited less fear during extinction by freezing less than WTs. A fear reinstatement test after extinction retrieval indicated that faster extinction was not due to poor memory for conditioning. During initial extinction and extinction retrieval training, neuronal activity was recorded from prelimbic (PL) cortex, a subregion of PFC known to be important for fear expression. In WTs, a large number of neurons were activated by the conditioned stimulus during initial extinction and this activation was significantly impaired in R6/2s. Notably, there was no genotype difference in PFC activity during extinction retrieval. Thus, altered extinction is likely a result of reduced fear expression due to impairments in PL activation. Collectively, our results suggest that PFC dysfunction may play a key role in R6/2 cognitive impairments." @default.
• W2016430082 created "2016-06-24" @default.
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• W2016430082 date "2011-08-01" @default.
• W2016430082 modified "2023-09-26" @default.
• W2016430082 title "Reduced expression of conditioned fear in the R6/2 mouse model of Huntington's disease is related to abnormal activity in prelimbic cortex" @default.
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• W2016430082 doi "https://doi.org/10.1016/j.nbd.2011.04.009" @default.
• W2016430082 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3114205" @default.
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