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Infect. Immun., Apr 1997, 1486-1496, Vol 65, No. 4
Copyright © 1997, American Society for Microbiology

Human monocyte-derived macrophages infected with virulent Shigella flexneri in vitro undergo a rapid cytolytic event similar to oncosis but not apoptosis

CM Fernandez-Prada, DL Hoover, BD Tall and MM Venkatesan
Department of Microbiology and Immunology, George Washington University School of Medicine, Washington, D.C. 20204, USA.

Infection of human monocyte-derived macrophages in vitro with virulent Shigella flexneri resulted in cell death which involved rupture of the plasma membrane, cell swelling, disintegration of ultrastructure, and generalized karyolysis. These features bore resemblance to oncosis and are in striking contrast to previously described observations of mouse macrophages, where a similar infection by virulent Shigella resulted in cell death by apoptosis. Cell death by oncosis in human macrophages was confirmed by lactate dehydrogenase release, light microscopy, electron microscopy, terminal deoxynucleotidyltransferase end labeling of DNA ends, DNA fragmentation assays, and fluorescence-activated cell sorter analysis of propidium-labeled nuclei. Thus, the phenomena of cell death induced by virulent Shigella in human and mouse macrophages reflect different biochemical pathways. Interleukin-1beta (IL-1beta) was released in culture supernatants of human macrophages infected with virulent bacteria. Inhibition with IL-1beta-converting enzyme inhibitors indicated, however, that this release occurred as a passive event of cell lysis. The patterns of intracellular survival of Shigella strains within human and mouse macrophages reflect differences that exist not only between Shigella serotypes but also between the two different macrophage cell types.

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