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• W2038492362 endingPage "155" @default.
• W2038492362 startingPage "143" @default.
• W2038492362 abstract "Cholinergic fibers from the brainstem and basal forebrain innervate the medial prefrontal cortex (mPFC) modulating neuronal activity and synaptic plasticity responses to hippocampal inputs. Here, we investigated the muscarinic and glutamatergic modulation of long-term depression (LTD) in the intact projections from CA1 to mPFC in vivo. Cortical-evoked responses were recorded in urethane-anesthetized rats for 30 min during baseline and 4 h following LTD. In order to test the potentiating effects of pilocarpine (PILO), independent groups of rats received either a microinjection of PILO (40 nmol; i.c.v.) or vehicle, immediately before or 20 min after a sub-threshold LTD protocol (600 pulses, 1 Hz; LFS600). Other groups received either an infusion of the selective NMDA receptor antagonist (AP7; 10 nmol; intra-mPFC) or vehicle, 10 min prior to PILO preceding LFS600, or prior to a supra-threshold LTD protocol (900 pulses, 1 Hz; LFS900). Our results show that PILO converts a transient cortical depression induced by LFS600 into a robust LTD, stable for at least 4 h. When applied after LFS600, PILO does not change either mPFC basal neurotransmission or late LTD. Our data also indicate that NMDA receptor pre-activation is essential to the muscarinic enhancement of mPFC synaptic depression, since AP7 microinjection into the mPFC blocked the conversion of transient depression into long-lasting LTD produced by PILO. In addition, AP7 effectively blocked the long-lasting LTD induced by LFS900. Therefore, our findings suggest that the glutamatergic co-activation of prefrontal neurons is important for the effects of PILO on mPFC synaptic depression, which could play an important role in the control of executive and emotional functions." @default.
• W2038492362 created "2016-06-24" @default.
• W2038492362 creator A5013458373 @default.
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• W2038492362 date "2013-02-01" @default.
• W2038492362 modified "2023-09-30" @default.
• W2038492362 title "NMDA receptor blockade impairs the muscarinic conversion of sub-threshold transient depression into long-lasting LTD in the hippocampus–prefrontal cortex pathway in vivo: Correlation with gamma oscillations" @default.
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• W2038492362 doi "https://doi.org/10.1016/j.neuropharm.2012.09.013" @default.
• W2038492362 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23022398" @default.
• W2038492362 hasPublicationYear "2013" @default.
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