期刊
JOURNAL OF PHYSIOLOGY-LONDON
卷 553, 期 1, 页码 169-182出版社
WILEY
DOI: 10.1113/jphysiol.2003.050799
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资金
- FIC NIH HHS [TWO1214] Funding Source: Medline
- NIDA NIH HHS [DA12958, R01 DA012958] Funding Source: Medline
- NINDS NIH HHS [R01 NS034696, NS34696, R37 NS034696] Funding Source: Medline
In a rat corticostriatal slice, brief, suprathreshold, repetitive cortical stimulation evoked long-lasting plateau potentials in neostriatal neurons. Plateau potentials were often followed by spontaneous voltage transitions between two preferred membrane potentials. While the induction of plateau potentials was disrupted by non-NMDA and NMDA glutamate receptor antagonists, the maintenance of spontaneous voltage transitions was only blocked by NMDA receptor and L-type Ca2+ channel antagonists. The frequency and duration of depolarized events, resembling up-states described in vivo, were increased by NMDA and L-type Ca2+ channel agonists as well as by GABA(A) receptor and K+ channel antagonists. NMDA created a region of negative slope conductance and a positive slope crossing indicative of membrane bistability in the current-voltage relationship. NMDA-induced bistability was partially blocked by L-type Ca2+ channel antagonists. Although evoked by synaptic stimulation, plateau potentials and voltage oscillations could not be evoked by somatic current injection - suggesting a dendritic origin. These data show that NMDA and L-type Ca2+ conductances of spiny neurons are capable of rendering them bistable. This may help to support prolonged depolarizations and voltage oscillations under certain conditions.
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