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Titolo:
AMPA receptor kinetics limit retinal amacrine cell excitatory synaptic responses
Autore:
Tran, MN; Higgs, MH; Lukasiewicz, PD;
Indirizzi:
Washington Univ, Sch Med, Dept Ophthalmol & Visual Sci, St Louis, MO 63110USA Washington Univ St Louis MO USA 63110 & Visual Sci, St Louis, MO 63110USA Washington Univ, Sch Med, Dept Anat & Neurobiol, St Louis, MO 63110 USA Washington Univ St Louis MO USA 63110 & Neurobiol, St Louis, MO 63110 USA
Titolo Testata:
VISUAL NEUROSCIENCE
fascicolo: 5, volume: 16, anno: 1999,
pagine: 835 - 842
SICI:
0952-5238(199909/10)16:5<835:ARKLRA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIGER SALAMANDER RETINA; PREFERRING GLUTAMATE RECEPTORS; INNER PLEXIFORM LAYER; GANGLION-CELLS; HIPPOCAMPAL-NEURONS; LATERAL INTERACTIONS; VERTEBRATE RETINA; CONCANAVALIN-A; DRG-NEURONS; TIME-COURSE;
Keywords:
amacrine cell; ganglion cell; AMPA receptor; cyclothiazide; GYKI;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Lukasiewicz, PD Washington Univ, Sch Med, Dept Ophthalmol & Visual Sci, Campus Box 8096, St Louis, MO 63110 USA Washington Univ Campus Box 8096 St Louis MO USA 63110 USA
Citazione:
M.N. Tran et al., "AMPA receptor kinetics limit retinal amacrine cell excitatory synaptic responses", VIS NEUROSC, 16(5), 1999, pp. 835-842

Abstract

Amacrine cells that respond transiently to maintained illumination are thought to mediate transient inhibitory input to ganglion cells. The excitation of these transient amacrine cells is thought to be limited by inhibitory feedback to bipolar cells. We investigated the possibility that desensitizing AMPA and/or kainate (KA) receptors on amacrine cells might also limit the duration of amacrine cell excitation. To determine how these receptors might affect amacrine cell input and output, we made whole-cell recordings from amacrine and ganglion cells in the salamander retinal slice. The specific AMPA receptor antagonist GYKI-53655 blocked non-NMDA receptor-mediated amacrine cell excitatory postsynaptic currents (EPSCs) and kainate puff-elicited currents, indicating that AMPA, and not KA, receptors mediated the responses. Cyclothiazide, an agent that reduces AMPA receptor desensitization, increased the amplitude and duration of amacrine cell EPSCs. To measure theoutput of transient amacrine cells, we recorded glycinergic inhibitory postsynaptic currents (IPSCs) from ganglion cells, and found that these were also enhanced by cyclothiazide. Thus, prolongation of amacrine cell AMPA receptor activation enhanced amacrine cell output. Current responses elicited by puffing glycine onto ganglion cell dendrites were not affected by cyclothiazide, indicating that the enhancement of glycinergic IPSCs was not due to a direct effect on glycine receptors. These data suggest that rapid AMPA receptor desensitization and/or deactivation limits glycinergic amacrine cell excitation and the resulting inhibitory synaptic output.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 13:05:01