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Published online before print January 24, 2005

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© by The Society for Leukocyte Biology
Journal of Leukocyte Biology, doi:10.1189/jlb.0704433

Received for publication July 27, 2004.

Accepted for publication January 4, 2005.

Article

V9V2 T cells use a combination of mechanisms to limit the spread of the pathogenic bacteria Brucella

Institut National de la Santé et de la Recherche Médicale Unité 431, Microbiologie et Pathologie Cellulaire Infectieuse, Université de Montpellier II, France

^@ To whom correspondence should be addressed. E-mail: vlafont{at}crit.univ-montp2.fr.

	Abstract

Human V9V2 T cells play a crucial role in early immune response to intracellular pathogens. In brucellosis infection, this population of cells is drastically increased in the peripheral blood of patients during the acute phase of infection. In vitro, V9V2 T cells exhibit strong cytolytic activity against Brucella-infected cells and are able to impair intracellular growth of Brucella suis in autologous macrophages. In this study, we have investigated the relative importance of contact-dependent mechanisms versus soluble factors in the intracellular growth and viability of B. suis. We show that V9V2 T cells use contact-dependent mechanisms, such as the release of lytic granules and Fas-mediated signals, to decrease intracellular B. suis through lysis of infected macrophages, but these mechanisms have little impact on Brucella survival. Moreover, we demonstrate that soluble factors secreted by V9V2 T cells can directly affect B. suis survival through their potent bactericidal effects. From these results, we conclude that V9V2 T cells are able to use a combination of mechanisms that reduce the total numbers of B. suis and thus, may benefit the host by limiting the spread of this intracellular pathogen.

Key Words: human • T lymphocytes • bacterial infection • cytotoxicity • cytokines

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