Spatially periodic discrete contact regions in polylysine-induced erythrocyte-yeast adhesion - PubMed (original) (raw)

Spatially periodic discrete contact regions in polylysine-induced erythrocyte-yeast adhesion

L A Hewison et al. Cell Biophys. 1988 Oct.

Abstract

Cell-cell adhesion occurs when human erythrocytes and yeast cells are suspended together in suprathreshold concentrations of polylysine in saline. The threshold polycation concentration for adhesion depends on cell concentration and decreases with increasing polycation molecular weight. The threshold concentration was similar for erythrocyte-erythrocyte adhesion and for yeast-erythrocyte adhesion. Transmission electron micrographs show that the erythrocytes adhere to yeast as if to engulf the cell. The regions of close contact between the erythrocyte membrane and the yeast cell walls are spatially discrete. The contact separation distance for the asymmetric erythrocyte-yeast adhesion is very similar to that (0.83 micron) observed when polylysine-induced adhesion occurs in the symmetrical erythrocyte-erythrocyte system. The spacing is attributed to the growth of a squeezing wave as an interfacial instability, on the intercellular aqueous layer. Freeze-fracture electron microscopy of cells that were not fixed during preparation for microscopy confirms the discrete nature of contacts between polylysine treated erythrocytes.

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