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Titolo:
CHRONIC BLOCKADE OF GLUTAMATE-MEDIATED BIOELECTRIC ACTIVITY IN LONG-TERM ORGANOTYPIC NEOCORTICAL EXPLANTS DIFFERENTIALLY EFFECTS PYRAMIDAL NON-PYRAMIDAL DENDRITIC MORPHOLOGY/
Autore:
BAKER RE; WOLTERS P; VANPELT J;
Indirizzi:
NETHERLANDS INST BRAIN RES,MEIBERGDREEF 33 NL-1105 AZ AMSTERDAM NETHERLANDS
Titolo Testata:
Developmental brain research
fascicolo: 1-2, volume: 104, anno: 1997,
pagine: 31 - 39
SICI:
0165-3806(1997)104:1-2<31:CBOGBA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAT VISUAL-CORTEX; NEUROTROPHIC FACTOR PROMOTES; LATERAL GENICULATE-NUCLEUS; SLICE CULTURES; HIPPOCAMPAL-NEURONS; IN-VITRO; POSTNATAL-DEVELOPMENT; NONPYRAMIDAL NEURONS; EFFERENT CONNECTIONS; NEURITE OUTGROWTH;
Keywords:
TISSUE CULTURE; NEOCORTEX; ORGANOTYPIC SLICE; DENDRITIC MORPHOLOGY; APV/DNQX; BIOELECTRIC ACTIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
R.E. Baker et al., "CHRONIC BLOCKADE OF GLUTAMATE-MEDIATED BIOELECTRIC ACTIVITY IN LONG-TERM ORGANOTYPIC NEOCORTICAL EXPLANTS DIFFERENTIALLY EFFECTS PYRAMIDAL NON-PYRAMIDAL DENDRITIC MORPHOLOGY/", Developmental brain research, 104(1-2), 1997, pp. 31-39

Abstract

Dendritic/axonal growth has been examined in long-term organotypic neocortical explants taken from neonatal rat pups and grown either as isolated slices or as co-cultures. The quantitative light microscopic measurement of dendritic and axonal branching patterns within both typesof explants was carried out on Golgi-stained materials. Spontaneous bioelectric activity (SEA) was blocked within both types of explants using a combination of APV and DNQX, NMDA and non-NMDA receptor antagonists, respectively. No extracellularly measurable SEA was observed to occur in the silenced explants in the presence of both antagonists but reappeared following wash-out with control medium. In both control andsilenced explants, the overall cellular organization of the slice wasmaintained throughout the culturing period, with distinguishable pyramidal and non-pyramidal neurons located within the same layers and with the same orientations as observed in situ. The major findings of thepresent study show the following. (i) Pyramidal neurones chronically exposed to APV/DNQX exhibited no basal dendritic growth in co-culturedexplants, while growth of apical dendritic lengths was similar to control values in the absence of SEA. (ii) Pyramidal neurones, nonetheless, exhibited significant terminal segment growth under SEA blockade which was correlated with a concomitant decrease in number of basal dendrites. (iii) Axonal growth in co-cultures was not sustained in silenced pyramidal neurones. (iv) Non-pyramidal neurones showed significant total dendritic and axonal growth in co-cultures following APV/DNQX treatment. (v) Non-pyramidal cells in co-cultures experienced an increasein terminal segment length at 2 weeks which declined in the third week. This increase-decrease was correlated with a decrease-increase in the total number of dendritic segments during the second and third weeks, respectively. (vi) In isolated explants the only departure from control growth curves was a significant increase in terminal segment length which was offset by a similar decrease in number of dendritic segments under APV/DNQX growth conditions. Thus the chronic loss of glutamate-mediated SEA differentially effected pyramidal and non-pyramidal neurones in isolated and co-cultured explants, with pyramidal neurones experiencing the more pronounced effects. We conclude that SEA effects the dynamics of neuritic elongation and branching and that these changes are most dramatically seen in co-cultures which cross-innervate oneanother, presumably via pyramidal axons. We hypothesize that the activity-dependent changes associated with reduction in pyramidal dendritic and axonal growth may be associated with neurotrophin receptor production/maturation. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/07/20 alle ore 15:27:58