Click here to close
Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly.
We suggest using a current version of Chrome,
FireFox, or Safari.
New membrane formation and intercellular communication in the early Xenopus embryo.
de Laat SW
,
Barts PW
,
Bakker MI
.
???displayArticle.abstract???
The ionic permeability of the nonjunctional and newly formed junctional membranes was investigated in embryos of Xenopus laevis up to the onset of the fifth cleavage. Continuous measurements were made of the equivalent nonjunctional (R'o) and junctional resistances (R'i) in different pairs of adjacent cells separated by one of the four cleavage membranes formed in that period. The specific resistance of the nonjunctional membranes (ro) and of each cleavage membrane (ri) as a function of time were derived using a generally applicable computer simulation model. ro decreased from about 40 komega cm2 in the in the uncleaved egg to about 10 komega cm2 at the 16-cell stage, due to the insertion of a small fraction of the relatively permeable newly formed cleavage membranes into the outer surface. Superimposed on this overall decline, a transient decrease of ro was observed during each cycle, caused by a temporary partial separation of the peripheral parts of adjacent blastomeres. The changes in followed the same pattern. R'1 increased stepwise during each cleavage cycle. At the onset of each cleavage there were no significant differences in R'i as measured between different pairs of cells. After an initial phase of membrane formation ri of all cleavage membranes remained constant at about 400 omega cm2. In the states investigated the coupling ratio ranged from 0.8 to 1. It is argued that this close coupling could be the result of the highly impermeable outer surface even in the absence of specialized junctions in the intercellular membranes.
ASHMAN,
INTERCELLULAR ELECTRICAL COUPLING AT A FORMING MEMBRANE JUNCTION IN A DIVIDING CELL.
1964, Pubmed
ASHMAN,
INTERCELLULAR ELECTRICAL COUPLING AT A FORMING MEMBRANE JUNCTION IN A DIVIDING CELL.
1964,
Pubmed
Azarnia,
The membrane junctions in communicating and noncommunicating cells, their hybrids, and segregants.
1974,
Pubmed
Bennett,
Physiology of electrotonic junctions.
1966,
Pubmed
Bennett,
Electrical coupling between embryonic cells by way of extracellular space and specialized junctions.
1970,
Pubmed
Bennett,
Function of electrotonic junctions in embryonic and adult tissues.
1973,
Pubmed
,
Xenbase
Bennett,
Properties of electrotonic junctions between embryonic cells of Fundulus.
1972,
Pubmed
Bluemink,
New membrane formation during cytokinesis in normal and cytochalasin B-treated eggs of Xenopus laevis. I. Electron microscope observations.
1973,
Pubmed
,
Xenbase
De Laat,
Intracellular ionic compartmentation, electrical membrane properties, and cell membrane permeability before and during first cleavage in the Ambystoma egg.
1975,
Pubmed
Decker,
Assembly of gap junctions during amphibian neurulation.
1974,
Pubmed
Dicaprio,
Dynamic Properties of Electrotonic Coupling between Cells of Early Xenopus Embryos.
1974,
Pubmed
,
Xenbase
Furshpan,
Low-resistance junctions between cells in embryos and tissue culture.
1968,
Pubmed
Gilula,
Metabolic coupling, ionic coupling and cell contacts.
1972,
Pubmed
Hülser,
Gap and low-resistance junctions between cells in culture.
1973,
Pubmed
Ito,
Electrical characteristics of Triturus egg cells during cleavage.
1966,
Pubmed
Ito,
Studies on the formation of a permeable cell membrane junction. II. Evolving junctional conductance and junctional insulation.
1974,
Pubmed
Ito,
Studies on the formation of a permeable cell membrane junction. I. Coupling under various conditions of membrane contact. Effects of colchicine, cytochalasin B, dinitrophenol.
1974,
Pubmed
Ito,
Ionic communication between early embryonic cells.
1969,
Pubmed
Johnson,
Junctions between cancer cells in culture: ultrastructure and permeability.
1971,
Pubmed
LOEWENSTEIN,
STUDIES ON AN EPITHELIAL (GLAND) CELL JUNCTION. I. MODIFICATIONS OF SURFACE MEMBRANE PERMEABILITY.
1964,
Pubmed
Loewenstein,
Some reflections on growth and differentiation.
1968,
Pubmed
Loewenstein,
Permeability of membrane junctions.
1966,
Pubmed
McDonald,
External potassium and baby hamster kidney cells: intracellular ions, ATP, growth, DNA synthesis and membrane potential.
1972,
Pubmed
Palmer,
Some bio-electric parameters of early Xenopus embryos.
1970,
Pubmed
,
Xenbase
Payton,
Permeability and structure of junctional membranes at an electrotonic synapse.
1969,
Pubmed
Potter,
Connections between cells of the developing squid as revealed by electrophysiological methods.
1966,
Pubmed
Revel,
Gap junctions between electrotonically coupled cells in tissue culture and in brown fat.
1971,
Pubmed
Rose,
Intercellular communication and some structural aspects of membrane junctions in a simple cell system.
1971,
Pubmed
Sanders,
The blastomere periphery ofXenopus laevis, with special reference to intercellular relationships.
1972,
Pubmed
Satir,
The fine structure of membranes and intercellular communication in insects.
1973,
Pubmed
Sheridan,
Dye movement and low-resistance junctions between reaggregated embryonic cells.
1971,
Pubmed
,
Xenbase
Sheridan,
Electrophysiological evidence for low-resistance intercellular junctions in the early chick embryo.
1968,
Pubmed
Singal,
An ultrastructural study of the first cleavage of Xenopus embryos.
1974,
Pubmed
,
Xenbase
Slack,
The permeability of intercellular junctions in the early embryo of Xenopus laevis, studied with a fluorescent tracer.
1969,
Pubmed
,
Xenbase
Tupper,
The onset of electrical communication between cells in the developing starfish embryo.
1970,
Pubmed
Tupper,
The ionic basis of the membrane potential in the early Asterias embryo.
1972,
Pubmed
WIENER,
STUDIES ON AN EPITHELIAL (GLAND) CELL JUNCTION. II. SURFACE STRUCTURE.
1964,
Pubmed
Woodward,
Electrical signs of new membrane production during cleavage of Rana pipiens eggs.
1968,
Pubmed
de Laat,
New membrane formation and intercellular communication in the early Xenopus embryo. II. Theoretical analysis.
1976,
Pubmed
,
Xenbase
de Laat,
New membrane formation during cytokinesis in normal and cytochalasin B-treated eggs of Xenopus laevis. II. Electrophysiological observations.
1974,
Pubmed
,
Xenbase
de Laat,
Intracellular ionic distribution, cell membrane permeability and membrane potential of the Xenopus egg during first cleavage.
1974,
Pubmed
,
Xenbase
de Laat,
The action of cytochalasin B during egg cleavage in Xenopus laevis: dependence on cell membrane permeability.
1973,
Pubmed
,
Xenbase
