RT Journal Article SR Electronic T1 Dissociation between CA3–CA1 Synaptic Plasticity and Associative Learning in TgNTRK3 Transgenic Mice JF The Journal of Neuroscience JO J. Neurosci. FD Society for Neuroscience SP 2253 OP 2260 DO 10.1523/JNEUROSCI.4055-06.2007 VO 27 IS 9 A1 Ignasi Sahún A1 José María Delgado-García A1 Alejandro Amador-Arjona A1 Albert Giralt A1 Jordi Alberch A1 Mara Dierssen A1 Agnès Gruart YR 2007 UL http://www.jneurosci.org/content/27/9/2253.abstract AB Neurotrophins and their cognate receptors might serve as feedback regulators for the efficacy of synaptic transmission. We analyzed mice overexpressing TrkC (TgNTRK3) for synaptic plasticity and the expression of glutamate receptor subunits. Animals were conditioned using a trace [conditioned stimulus (CS), tone; unconditioned stimulus (US), shock] paradigm. A single electrical pulse presented to the Schaffer collateral–commissural pathway during the CS–US interval evoked a monosynaptic field EPSP (fEPSP) at ipsilateral CA1 pyramidal cells. In wild types, fEPSP slopes increased across conditioning sessions and decreased during extinction, being linearly related to learning evolution. In contrast, fEPSPs in TgNTRK3 animals reached extremely high values, not accompanied with a proportionate increase in their learning curves. Long-term potentiation evoked in conscious TgNTRK3 was also significantly longer lasting than in wild-type mice. These functional alterations were accompanied by significant changes in NR1 and NR2B NMDA receptor subunits, with no modification of NR1Ser 896 or NR1Ser 897 phosphorylation. No changes of AMPA and kainate subunits were detected. Results indicate that the NT-3/TrkC cascade could regulate synaptic transmission and plasticity through modulation of glutamatergic transmission at the CA3–CA1 synapse.