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Published online 9 August 2004 doi:10.1084/jem.20040769
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 200, Number 4, 535-540
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Brief Definitive Report

Type I Interferon Sensitizes Lymphocytes to Apoptosis and Reduces Resistance to Listeria Infection

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

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

Address correspondence to Emil R. Unanue, Dept. of Pathology and Immunology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis, MO 63110. Phone: (314) 362-7442; Fax: (314) 362-4096; email: unanue{at}pathology.wustl.edu

Infection with Listeria monocytogenes causes lymphocyte apoptosis that is mediated by the actions of the pore-forming virulence factor listeriolysin O (LLO). Previous work showed that activated lymphocytes were highly sensitive to LLO-induced apoptosis, whereas resting lymphocytes were less susceptible. We now show that mice deficient in the type I interferon (IFN) receptor were more resistant to Listeria infection and had less apoptotic lesions than wild-type counterparts. Furthermore, treatment of resting splenic lymphocytes with recombinant IFN-{alpha}A enhanced their susceptibility to LLO-induced apoptosis. Together, these data suggest that type I IFN signaling is detrimental to handling of a bacterial pathogen and may enhance the susceptibility of lymphocytes undergoing apoptosis in response to bacterial pore-forming toxins.

Key Words: apoptosis • cytokines • Listeria • inflammation • T lymphocytes



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