Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Cholinergic induction of theta-frequency oscillations in hippocampal inhibitory interneurons and pacing of pyramidal cell firing
Autore:
Chapman, CA; Lacaille, JC;
Indirizzi:
Univ Montreal, Fac Med, Dept Physiol, Montreal, PQ H3C 3A7, Canada Univ Montreal Montreal PQ Canada H3C 3A7 ol, Montreal, PQ H3C 3A7, Canada Univ Montreal, Ctr Rech Sci Neurol, Montreal, PQ H3C 3A7, Canada Univ Montreal Montreal PQ Canada H3C 3A7 ol, Montreal, PQ H3C 3A7, Canada
Titolo Testata:
JOURNAL OF NEUROSCIENCE
fascicolo: 19, volume: 19, anno: 1999,
pagine: 8637 - 8645
SICI:
0270-6474(19991001)19:19<8637:CIOTOI>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
LACUNOSUM-MOLECULARE INTERNEURONS; MEMBRANE-POTENTIAL OSCILLATIONS; LONG-TERM POTENTIATION; GUINEA-PIG HIPPOCAMPUS; VOLTAGE-CLAMP ANALYSIS; LAYER-II NEURONS; RAT HIPPOCAMPUS; IN-VITRO; GABAERGIC INTERNEURONS; CA1 REGION;
Keywords:
hippocampus; lacunosum-moleculare; theta; rhythmic slow activity; interneurons; cholinergic GABA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Lacaille, JC Univ Montreal, Fac Med, Dept Physiol, CP 6128 Succ Centerville, Montreal, PQ H3C 3A7, Canada Univ Montreal CP 6128 Succ Centerville Montreal PQ Canada H3C 3A7
Citazione:
C.A. Chapman e J.C. Lacaille, "Cholinergic induction of theta-frequency oscillations in hippocampal inhibitory interneurons and pacing of pyramidal cell firing", J NEUROSC, 19(19), 1999, pp. 8637-8645

Abstract

Cholinergic and GABAergic medial septal afferents contribute to hippocampal theta activity in part by actions on local interneurons. Interneurons near the border between stratum radiatum and stratum lacunosum-moleculare (LM)display intrinsic membrane potential oscillations at theta frequency when depolarized near threshold. First, whole-cell current-clamp recordings in rat hippocampal slices were used to examine effects of the cholinergic agonist carbachol on biocytin-labeled LM interneurons. At resting membrane potential, cells were depolarized by bath application of 25 mu M carbachol, and the depolarization was sufficient to induce membrane potential oscillations(2.4 +/- 0.2 mV) that paced cell firing. Carbachol also depolarized LM interneurons in the presence of 6-cyano-7-nitroquinoxaline-2,3-dione, (+/-)-2-amino-5-phosphonopentanoic acid, and bicuculline, indicating that cholinergic depolarization of LM cells does not depend on ionotropic glutamate or GABAA synaptic transmission in local circuits. Atropine blocked the depolarization, indicating that muscarinic receptors were involved. Minimal stimulation applied to visually identified LM interneurons was then used to determine if spontaneous activity in CA1 pyramidal cells can be paced by rhythmic inhibition generated by LM cells at theta frequency. Inhibitory postsynaptic potentials evoked in pyramidal cells by single minimal stimulations were followed by rebound depolarizations and action potentials. When trains of minimal stimulation were delivered, membrane potential oscillations of depolarized pyramidal cells followed the stimulation frequency. Minimal stimulation led pyramidal cell firing with an average phase of 177 degrees. Thus, muscarinic induction of theta-frequency membrane potential oscillations in LM interneurons may contribute to the generation of rhythmic inhibition thatpaces intrinsically generated theta activity in CA1 pyramidal cells.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 15:34:11