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Titolo:
THE RAPID ASSEMBLY OF SYNAPTIC SITES IN PHOTORECEPTOR TERMINALS OF THE FLYS OPTIC LOBE RECOVERING FROM COLD SHOCK
Autore:
BRANDSTATTER JH; MEINERTZHAGEN IA;
Indirizzi:
MAX PLANCK INST HIRNFORSCH,NEUROANAT ABT,DEUTSCHORDENSTR 46 D-60528 FRANKFURT GERMANY DALHOUSIE UNIV,CTR LIFE SCI,INST NEUROSCI HALIFAX NS B3H 4J1 CANADA
Titolo Testata:
Proceedings of the National Academy of Sciences of the United Statesof America
fascicolo: 7, volume: 92, anno: 1995,
pagine: 2677 - 2681
SICI:
0027-8424(1995)92:7<2677:TRAOSS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MUSCA-DOMESTICA L; VISUAL-SYSTEM; LAMINA GANGLIONARIS; FREEZE-FRACTURE; FINE-STRUCTURE; COMPOUND EYE; PLASTICITY; RETINA; HIBERNATION; SYNAPSES;
Keywords:
SYNAPTIC PLASTICITY; SYNAPTIC RIBBON; CAPITATE PROJECTION; TEMPERATURE REVERSAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
J.H. Brandstatter e I.A. Meinertzhagen, "THE RAPID ASSEMBLY OF SYNAPTIC SITES IN PHOTORECEPTOR TERMINALS OF THE FLYS OPTIC LOBE RECOVERING FROM COLD SHOCK", Proceedings of the National Academy of Sciences of the United Statesof America, 92(7), 1995, pp. 2677-2681

Abstract

When a housefly, Musca domestica, is subject to cold exposure (0 degrees C for 24 hr), a number of obvious changes are seen in the first optic neuropil, or lamina, beneath the compound eye. In particular, the number of afferent photoreceptor synapses declines by about 30%. This loss is dramatically restored after warm recovery at 23 degrees C for 24 hr. Synapses disappear at an average rate of 2-3/hr during cold exposure and reappear at a maximal rate of more than 20/hr during the first 2 hr of warm recovery. Thereafter their number temporarily overshoots control values, to increase at 6 hr of warm recovery to 60% above their cold-exposed minimum. The number subsequently returns more or less to normal. These changes demonstrate the lability of synaptic sites under these conditions, with individual sites forming and disappearingrapidly. The changes also interrupt the close correlation between synaptic number and the surface area of the receptor terminal, a correlation that normally conserves synaptic spacing density. The density is preserved during cold exposure but increases during warm recovery at a time when the addition of newly formed synapses exceeds the slower increase in receptor terminal size.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 00:22:08