RT journal article
T1 Ketamine promotes rapid and transient activation of AMPA receptor-mediated synaptic transmission in the dorsal raphe nucleus.
A1 Llamosas, Nerea
A1 Perez-Caballero, Laura
A1 Berrocoso Domínguez, Esther María
A1 Bruzos-Cidon, Cristina
A1 Ugedo, Luisa
A1 Torrecilla, María
A2 Psicología
K1 ketamine
K1 dorsal raphe
AB Accumulating evidence indicates that the antidepressant effects of ketamine are, in part, mediated by an increase in the AMPA receptor-mediated neurotransmission in depression related areas, such as the prefrontal cortex (PFC). Therefore, activity in PFC-projecting areas related to major depression, such as the dorsal raphe nucleus (DR), may also be modulated by ketamine. We used whole-cell patch-clamp recordings and western blot experiments to determine whether ketamine promotes acute and maintained alterations in glutamatergic transmission and mTOR pathway in the DR. Bath perfusion of ketamine, but not the NMDA receptor antagonist D-AP5, increased the frequency of AMPA receptor-mediated spontaneous EPSCs (sEPSCs) in DR neurons. However, ketamine did not affect evoked EPSCs or spontaneous inhibitory currents (sIPSCs). Pre-incubation of DR slices with the mTOR inhibitor PP242 decreased the frequency of sEPSCs and prevented the effect of ketamine. The results also show that while no electrophysiological effects were detected 24 h after ketamine administration, phosphorylation levels of mTOR were significantly increased in the DR. Nevertheless, expression levels of synaptic proteins were unaffected at that time. Altogether, the present data demonstrate that ketamine transiently increases spontaneous AMPA receptor-mediated neurotransmission in the DR.
PB Elsevier
SN 0278-5846
YR 2019
FD 2019-01
LK http://hdl.handle.net/10498/38823
UL http://hdl.handle.net/10498/38823
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026