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Infection and Immunity, August 2003, p. 4647-4656, Vol. 71, No. 8
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.8.4647-4656.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Stimulation of Neutrophil Granulocytes with Mycobacterium bovis Bacillus Calmette-Guérin Induces Changes in Phenotype and Gene Expression and Inhibits Spontaneous Apoptosis

Department of Immunology and Cell Biology, Borstel Research Center, Borstel,¹ Department of Urology, Lübeck University Medical School, Lübeck, Germany²

Received 22 January 2003/ Returned for modification 6 March 2003/ Accepted 12 May 2003

Polymorphonuclear neutrophil granulocytes (PMN) have been implicated in the early inflammatory response against mycobacteria besides monocytes/macrophages. Yet, little is known about the interaction of mycobacteria with PMN. We investigated the potential of Mycobacterium bovis bacillus Calmette-Guérin (BCG) to stimulate and influence PMN phenotype, gene expression profile and spontaneous apoptosis. Flow cytometric analyses revealed an upregulation of the function-associated molecules Fc receptor III (FcR III) and II (CD16 and CD32) as well as MAC-1 (CD11b and CD18) on BCG-stimulated PMN. As determined by cDNA microarrays and multiplex reverse transcriptase PCR, stimulation with BCG alters the expression of various genes for proinflammatory cytokines/chemokines or receptors in PMN. We detected an upregulation or de novo synthesis of interleukin 1 (IL-1), IL-1ß, IL-8, macrophage inflammatory protein 1 (MIP-1), MIP-1ß, GRO-, transforming growth factor ß, MCP-1, IL-2 receptor (IL-2R), IL-10R, and IL-6R. Genes for IL-9, IL-12, IL-15, IL-5R, and IL-13R₁ were found to be downregulated or switched off. Furthermore, Giemsa and annexin V-propidium iodide double staining demonstrated an inhibition of spontaneous PMN apoptosis following BCG stimulation. Changes in phenotype and inhibition of apoptosis did not depend on direct mycobacterial stimulation alone, but were a result of an autocrine-paracrine stimulation mechanism. Our findings support the hypothesis that PMN become activated at the site of mycobacterial infections and that this activation might set the stage for a subsequent antimycobacterial immune response.

Editor: F. C. Fang

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