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Titolo:
A wave of free cytosolic calcium traverses zebrafish eggs on activation
Autore:
Lee, KW; Webb, SE; Miller, AL;
Indirizzi:
HKUST, Dept Biol, Hong Kong, Peoples R China HKUST Hong Kong Peoples R China , Dept Biol, Hong Kong, Peoples R China
Titolo Testata:
DEVELOPMENTAL BIOLOGY
fascicolo: 1, volume: 214, anno: 1999,
pagine: 168 - 180
SICI:
0012-1606(19991001)214:1<168:AWOFCC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEA-URCHIN EGGS; SCANNING ELECTRON-MICROSCOPE; CORTICAL GRANULE EXOCYTOSIS; PRAWN PALAEMON-SERRATUS; CA2+ OSCILLATIONS; OOCYTE ACTIVATION; SICYONIA-INGENTIS; MAMMALIAN EGGS; MARINE SHRIMP; SPERM FACTOR;
Keywords:
calcium; aequorin; zebrafish; activation; fertilization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Miller, AL HKUST, Dept Biol, Clear Water Bay, Hong Kong, Peoples R China HKUST Clear Water Bay Hong Kong Peoples R China oples R China
Citazione:
K.W. Lee et al., "A wave of free cytosolic calcium traverses zebrafish eggs on activation", DEVELOP BIO, 214(1), 1999, pp. 168-180

Abstract

The activation process in a variety of deuterostome and protostome eggs isaccompanied by cytosolic calcium transients that usually take the form of either a single or multiple propagating waves. Here we report that the eggsof zebrafish (Danio rerio) are no exception in that they generate a singleactivation wave that traverses the egg at a velocity of around 9 mu m/s. There appears, however, to be no difference between the calcium-mediated activation response of eggs with regard to the presence or absence of sperm inthe spawning medium. This leads us to suggest that these eggs are normallyactivated when they come in contact with their spawning medium and are then subsequently fertilized. The aspermic wave is initiated at the animal pole in the region of the micropyle, appears to propagate mainly through the yolk-free egg cortex, and then terminates at the vegetal pole. As neither sperm nor external calcium is required for the initiation (or propagation) ofthe activation wave, this suggests that an alternative wave trigger must be involved. (C) 1999 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 22:11:55