Fusion of human erythrocyte ghosts promoted by the combined action of calcium and phosphate ions

Nature

Fusion of human erythrocyte ghosts promoted by the combined action of calcium and phosphate ions"


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CALCIUM ions are important in almost all membrane fusion systems1–2. Murayama and Okada3 showed that Sendai virus-induced fusion of Ehrlich ascites cells required Ca2+. When Ehrlich ascites


cells were treated with Sendai virus in the presence of EDTA, cells agglutinated and lysed but did not fuse3,4. Similarly, Ca2+ was required for the fusion of erythrocytes stimulated by


chemicals such as lysolecithin5 or glyceryl monooleate6. Ca2+ plus the ionosphere A23187 (ref. 7) or Ca2+ at high pH (ref. 8) promoted the fusion of chicken erythrocytes. Fusion of


phosphatidylserine-rich liposomes was absolutely dependent on the presence of Ca2+9. We describe here the fusion of human erythrocyte ghosts promoted by the combined action of Ca2+ and


phosphate buffer. Human erythrocyte ghosts, because they lack cytoplasm and are easily filled with small or large molecules10,11 are useful for the investigation of membrane fusion.


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