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Titolo:
Survival promotion of mesencephalic dopaminergic neurons by depolarizing concentrations of K+ requires concurrent inactivation of NMDA or AMPA/kainate receptors
Autore:
Douhou, A; Troadec, JD; Ruberg, M; Raisman-Vozari, R; Michel, PP;
Indirizzi:
Hop La Pitie Salpetriere, INSERM, U289, F-75013 Paris, France Hop La PitieSalpetriere Paris France F-75013 289, F-75013 Paris, France Ctr Rech Pierre Fabre, F-81106 Castres, France Ctr Rech Pierre Fabre Castres France F-81106 re, F-81106 Castres, France
Titolo Testata:
JOURNAL OF NEUROCHEMISTRY
fascicolo: 1, volume: 78, anno: 2001,
pagine: 163 - 174
SICI:
0022-3042(200107)78:1<163:SPOMDN>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARKINSONS-DISEASE; TYROSINE-HYDROXYLASE; CA2+ PERMEABILITY; STRIATAL NEURONS; GANGLION-CELLS; HIGH POTASSIUM; GROWTH-FACTORS; GRANULE CELLS; DEATH; CHANNELS;
Keywords:
calcium; depolarization; dopaminergic neurons; glutamate receptors; neuroprotection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Michel, PP Hop La Pitie Salpetriere, INSERM, U289, 47 Blvd Hop, F-75013 Paris, France Hop La Pitie Salpetriere 47 Blvd Hop Paris France F-75013 ance
Citazione:
A. Douhou et al., "Survival promotion of mesencephalic dopaminergic neurons by depolarizing concentrations of K+ requires concurrent inactivation of NMDA or AMPA/kainate receptors", J NEUROCHEM, 78(1), 2001, pp. 163-174

Abstract

The death of dopaminergic neurons that occurs spontaneously in mesencephalic cultures was prevented by depolarizing concentrations of K+ (20-50 mM). However, unlike that observed previously in other neuronal populations of the PNS or CNS, promotion of survival required concurrent blockade of eitherNM DA or alpha -amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA)/kainate receptors by the specific antagonists, MK-801 and GYKI-52466, respectively. Rescued neurons appeared to be healthy and functional because the sametreatment also dramatically enhanced their capacity to accumulate dopamine. The effects on survival and uptake were rather specific to dopaminergic neurons, rapidly reversible and still observed when treatment was delayed after plating. Glutamate release increased substantially in the presence of elevated concentrations of K+, and chronic treatment with glutamate induced a loss of dopaminergic neurons that was prevented by MK-801 or GYKI-52466 suggesting that an excitotoxic process interfered with survival when only the depolarizing treatment was applied. The effects of the depolarizing stimulus in the presence of MK-801 were mimicked by BAY K-8644 and abolished by nifedipine, suggesting that neuroprotection resulted from Ca2+ influx through L-type calcium channels. Measurement of intracellular calcium revealed that MK-801 or GYKI-52466 were required to maintain Ca2+ levels within a trophic range, thus preventing K+-induced excitotoxic stress and Ca2+ overload. Altogether, our results suggest that dopaminergic neurons may require a finely tuned interplay between glutamatergic receptors and calcium channels for their development and maturation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 20:04:42