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• W2019191574 endingPage "95" @default.
• W2019191574 startingPage "89" @default.
• W2019191574 abstract "Long-lasting memories of aversive or stressful events have been associated with the noradrenergic system activation. Alpha-1-adrenergic antagonist prazosin has successfully been used in the last years to treat anxiety disorders related to aversive memories recurrence in humans. Contextual conditioned fear extinction paradigm in rats has been used to better understand the mechanisms involved in the attenuation of defensive behaviour after a traumatic situation. Here we investigated the effects of systemic administration of prazosin in the fear extinction processes. Rats were previously paired in a contextual fear conditioning box (1 footshock, 1 mA, 2 s duration), further returning to the same box during three consecutive days receiving an intraperitoneal injection of vehicle or prazosin 30 min before (acquisition of extinction; 0.1 or 0.5 mg/kg) or immediately after (consolidation of extinction, 0.5 or 1.5 mg/kg) each extinction session (10 min). On the last day, all animals were re-exposed undrugged to the apparatus. Since the medial prefrontal cortex (mPFC) has been described as a key structure in the modulation of conditioned fear extinction, the effects of intra-mPFC microinjection (0.2 μl per side) of vehicle (PBS) or prazosin (0.75 or 2.5 nmol) in the acquisition of fear extinction (10 min before extinction session 1) were further evaluated. Subjects were drug-free re-exposed to the same box in the next day (extinction session 2). The percentage of freezing time was used as the memory retention parameter. The results showed that either systemic or intra-mPFC-alpha-1-adrenergic blockade increased the freezing time in the last extinction sessions, suggesting impairment of the extinction of contextual conditioned fear in rats." @default.
• W2019191574 created "2016-06-24" @default.
• W2019191574 creator A5051641182 @default.
• W2019191574 creator A5062022152 @default.
• W2019191574 creator A5082818558 @default.
• W2019191574 date "2010-07-01" @default.
• W2019191574 modified "2023-10-10" @default.
• W2019191574 title "Impairment of contextual conditioned fear extinction after microinjection of alpha-1-adrenergic blocker prazosin into the medial prefrontal cortex" @default.
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• W2019191574 doi "https://doi.org/10.1016/j.bbr.2010.03.014" @default.
• W2019191574 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20227443" @default.
• W2019191574 hasPublicationYear "2010" @default.
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