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1. Ca2+ (0.4-16 mM) had no detectable action on the agglutination of hen erythrocytes by Sendai virus. 2. Pretreatment of the cells with Ca2+ (0.1-8 mM) in the presence of the bivalent cation ionophore A23187 led, however, to a significant decrease in the subsequent agglutination of the cells by the virus. 3. It thus appears that the entry of Ca2+ into the interior of these cells decreases cellular agglutination by Sendai virus; possible interpretations of this phenomenon are discussed in terms of the movement of intramembranous particles. 4. With a small number of virions, maximum cell fusion by Sendai virus occurred in the presence of EGTA [ethanedioxybis(ethylamine)tetra-acetate]. 5. Virus-induced cell fusion was significantly decreased by Ca2+, even at a concentration of 0.2 mM; it is suggested that this may result from diminished interactions between virus particles and erythrocyte membranes.

Effects of calcium ions and the bivalent cation ionophore A23187 on the agglutination and fusion of chicken erythrocytes by Sendai virus