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Titolo:
Potentiation in the first visual synapse of the fly compound eye
Autore:
Uusitalo, RO; Weckstrom, M;
Indirizzi:
Univ Oulu, Dept Physiol, FIN-90220 Oulu, Finland Univ Oulu Oulu Finland FIN-90220 , Dept Physiol, FIN-90220 Oulu, Finland Univ Oulu, Dept Ophthalmol, FIN-90220 Oulu, Finland Univ Oulu Oulu Finland FIN-90220 ept Ophthalmol, FIN-90220 Oulu, Finland Univ Oulu, Dept Phys Sci, Div Biophys, FIN-90220 Oulu, Finland Univ Oulu Oulu Finland FIN-90220 i, Div Biophys, FIN-90220 Oulu, Finland
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 4, volume: 83, anno: 2000,
pagine: 2103 - 2112
SICI:
0022-3077(200004)83:4<2103:PITFVS>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADAPTED BLOWFLY PHOTORECEPTORS; INSECT PHOTORECEPTORS; POTASSIUM CHANNELS; MONOPOLAR NEURONS; LIGHT ADAPTATION; SODIUM-PUMP; MEMBRANE; CELL; CALLIPHORA; RESPONSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Weckstrom, M Univ Oulu, Dept Physiol, Kajaanintie 52A, FIN-90220 Oulu, Finland Univ Oulu Kajaanintie 52A Oulu Finland FIN-90220 lu, Finland
Citazione:
R.O. Uusitalo e M. Weckstrom, "Potentiation in the first visual synapse of the fly compound eye", J NEUROPHYS, 83(4), 2000, pp. 2103-2112

Abstract

In the first visual synapse of the insect compound eye, both the presynaptic and postsynaptic signals are graded, nonspiking changes in membrane voltage. The synapse exhibits tonic transmitter release (even in dark) and strong adaptation to long-lasting light backgrounds, leading to changes also inthe dynamics of signal transmission. We have studied these adaptational properties of the first visual synapse of the blowfly Calliphora vicina. Investigations were done in situ by intracellular recordings from the presynaptic photoreceptors, photoreceptor axon terminals, and the postsynaptic firstorder visual interneurons (LMCs). The dark recovery, the shifts in intensity dependence, and the underlying processes were studied by stimulating thevisual system with various adapting stimuli while observing the recovery (i.e., dark adaptation). The findings show a transient potentiation in the postsynaptic responses after intense light adaptation, and the underlying mechanisms seem to be the changes in the equilibrium potential of the transmitter-gated conductance (chloride) of the postsynaptic neurons. The potentiation by itself serves as a mechanism that after light adaptation rapidly recovers the sensitivity loss of the visual system. However, this kind of mechanism, being an intrinsic property of graded potential transmission, may be quite widespread among graded synapses, and the phenomenon demonstrates that functional plasticity is also a property of graded synaptic transmission.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:27:25