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• W2807300532 abstract "Several clinically effective antidepressants increase the neuronal firing rate in the lateral septal nucleus (LSN), a forebrain structure that is anatomically related to medial prefrontal cortex (mPFC) regions. mPFC function is related to depression and the regulation of fear. However, unknown is whether antidepressant treatment or chronic stress modifies the responsivity of neuronal LSN-mPFC connections. We performed single-unit extracellular recordings in the anterior cingulate cortex (ACC) and prelimbic (PL) and infralimbic (IL) regions of the mPFC during stimulation of the LSN in anesthetized male Wistar rats that received fluoxetine (1 mg/kg, 21 days) or were subjected to chronic mild stress (5 weeks). The results were compared with a control group (saline treatment, devoid of behavioral manipulations). Stimulation of the LSN produced an initial excitatory paucisynaptic response, followed by an afterdischarge, characterized by an increase in the neuronal firing rate. Opposite changes were induced by fluoxetine treatment and chronic stress exposure. Peristimulus histograms and unit-activity ratio analyses indicated that LSN-mPFC responsivity differed between fluoxetine treatment and chronic stress exposure. Fluoxetine reduced neuronal responsivity in the LSN-PL and LSN-IL, and stress increased neuronal responsivity in the same regions. In both cases, the changes were more pronounced in the IL region. The lower responsivity of LSN-PL and LSN-IL connections that was produced by fluoxetine may reflect a higher threshold for fear, and lower responsivity of this connection may be related to states of fear. The LSN and mPFC comprise a portion of a limbic-cortical circuit where neuronal responses depend on specific conditions." @default.
• W2807300532 created "2018-06-13" @default.
• W2807300532 creator A5052746519 @default.
• W2807300532 creator A5069795936 @default.
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• W2807300532 date "2018-10-01" @default.
• W2807300532 modified "2023-10-01" @default.
• W2807300532 title "Fluoxetine and stress inversely modify lateral septal nucleus-mpfc neuronal responsivity" @default.
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• W2807300532 doi "https://doi.org/10.1016/j.bbr.2018.06.007" @default.
• W2807300532 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29885850" @default.
• W2807300532 hasPublicationYear "2018" @default.
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