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Titolo:
SOMATOSTATIN RECEPTOR SUBTYPES SST1 AND SST2 ELICIT OPPOSITE EFFECTS ON THE RESPONSE TO GLUTAMATE OF MOUSE HYPOTHALAMIC NEURONS - AN ELECTROPHYSIOLOGICAL AND SINGLE-CELL RT-PCR STUDY
Autore:
LANNEAU C; VIOLLET C; FAIVREBAUMAN A; LOUDES C; KORDON C; EPELBAUM J; GARDETTE R;
Indirizzi:
INSERM,U159,2TER RUE ALESIA F-75014 PARIS FRANCE INSERM,U159 F-75014 PARIS FRANCE
Titolo Testata:
European journal of neuroscience
fascicolo: 1, volume: 10, anno: 1998,
pagine: 204 - 212
SICI:
0953-816X(1998)10:1<204:SRSSAS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
IN-SITU HYBRIDIZATION; METHYL-D-ASPARTATE; CENTRAL-NERVOUS-SYSTEM; DIFFERENTIAL EXPRESSION; EXCITATORY TRANSMITTER; RAT-BRAIN; NEUROENDOCRINE REGULATION; POTASSIUM CURRENTS; GANGLION NEURONS; GENE-EXPRESSION;
Keywords:
AMPA/KA RESPONSES; CH-275 OCTREOTIDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
55
Recensione:
Indirizzi per estratti:
Citazione:
C. Lanneau et al., "SOMATOSTATIN RECEPTOR SUBTYPES SST1 AND SST2 ELICIT OPPOSITE EFFECTS ON THE RESPONSE TO GLUTAMATE OF MOUSE HYPOTHALAMIC NEURONS - AN ELECTROPHYSIOLOGICAL AND SINGLE-CELL RT-PCR STUDY", European journal of neuroscience, 10(1), 1998, pp. 204-212

Abstract

We have previously shown that somatostatin can either enhance or decrease AMPA/kainate receptor-mediated responses to glutamate in mouse-dissociated hypothalamic neurones grown in vitro, To investigate whetherthis effect is due to differential activation of somatostatin (SRIF) receptor subtypes, we compared modulation of the response to glutamateby SRIF with that induced by CH-275 and octreotide, two selective agonists of sst1 and sst2/sst5 receptors, respectively. Somatostatin either significantly decreased (49%) or increased (30%) peak currents induced by glutamate, and was ineffective in the remaining cells. Only thedecreased response was obtained with octreotide, whereas only increased responses were elicited by CH-275 (47 and 35% of the tested cells, respectively). Mean amplitude variations under somatostatin or octreotide on the one hand, and under somatostatin or CH-275 on the other hand, were equivalent. Pertussis toxin pretreatment significantly decreased the number of cells inhibited by somatostatin or octreotide, but had no effect on the frequency of neurones showing increased sensitivityto glutamate during somatostatin or CH-275 application. About half ofthe neurones tested by single cell reverse transcriptase polymerase chain reaction (RT-PCR) expressed only one sst receptor (sst1 in 26% and sst2 in 22% of studied cells). Out of the remaining neurones, 34% displayed neither sst1 nor sst2 mRNAs, whereas 18% showed a simultaneousexpression of both mRNA subtypes, Expression of sst1 or sst2 mRNA subtypes matched totally with the effects of somatostatin on sensitivity to glutamate in 79% of the neurones processed for PCR after recordings. These data show that pertussis toxin-insensitive activation of the sst1 receptor subtype mediates somatostatin-induced increase in sensitivity to glutamate, whereas decrease in the response to glutamate is linked to pertussis toxin-sensitive activation of the sst2 receptor subtype.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 07:59:45