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The Journal of Immunology, 2004, 172: 4866-4874.
Copyright © 2004 by The American Association of Immunologists

Listeriolysin O from Listeria monocytogenes Is a Lymphocyte Apoptogenic Molecule1

Javier A. Carrero, Boris Calderon and Emil R. Unanue2

Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110

Infection of mice with Listeria monocytogenes caused marked lymphocyte apoptosis in the white pulp of the spleen on day 2 postinfection. We prove in this study that listeriolysin O (LLO), a pore-forming molecule and a major virulence factor of Listeria, could directly induce murine lymphocyte apoptosis both in vivo and in vitro at nanomolar and subnanomolar doses. Induction of apoptosis by LLO was rapid, with caspase activation seen as early as 30 min post-treatment. T cells lost their mitochondrial membrane potential and exposed phosphatidylserine within 8 h of treatment. Incubation of lymphocytes with a pan-caspase inhibitor blocked DNA laddering and caspase-3 activation, but did not block phosphatidylserine exposure or loss of mitochondrial membrane potential. We describe a novel function for LLO: induction of lymphocyte apoptosis with rapid kinetics, effected by both caspase-dependent and -independent pathways.




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