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Influenza virus induces apoptosis in cultured cell lines as well as in animal tissues. HeLa cells were infected with influenza virus A/Udon/72 (H3N2) under conditions resulting in almost 100% infection. Such cells underwent typical caspase-dependent apoptosis and were efficiently phagocytosed by macrophages prepared from peritoneal fluids of thioglycolate-treated mice. The membrane phospholipid phosphatidylserine appeared on the surfaces of virus-infected cells at around the time efficient phagocytosis became detectable. In fact, the phagocytosis was almost completely inhibited in the presence of liposomes containing phosphatidylserine, which did not influence the antibody-dependent uptake of zymosan particles by the same macrophages. These results indicate that macrophages phagocytose influenza virus-infected HeLa cells in a manner mediated by phosphatidylserine that appears on the surfaces of infected cells during the process of apoptosis.

Phosphatidylserine-Mediated Phagocytosis of Influenza A Virus-Infected Cells by Mouse Peritoneal Macrophages