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Listeria monocytogenes infection enhances transcription factor NF-kappa B in P388D1 macrophage-like cells.

Lehrstuhl für Mikrobiologie, Theodor-Boveri-Institut für Biowissenschaften, Universität Würzburg, Germany.

ABSTRACT

In the present study, we investigated the effect of Listeria monocytogenes infection on the cellular level of the transcription factors NF-kappa B, AP-1, and NF-IL6 in the macrophage-like cell line P388D1 by using electrophoretic mobility shift assays. Infection with L. monocytogenes enhanced the formation of two NF-kappa B-like DNA-protein complexes, C1 and C2, whereas the concentration of AP-1 and NF-IL6 complexes remained unaffected. In supershift assays using NF-kappa B-specific antibodies, complex C2 was identified to be a p50 homodimer (KBF1) and complex C1 was identified as a p50/p65 heterodimer. Both complexes were formed within 10 min after addition of the bacteria. Since the synthesis of tumor necrosis factor alpha and interleukin-1 occurs at later times, these cytokines cannot be the mediators of enhanced NF-kappa B formation. Infection experiments with different nonhemolytic mutants of L. monocytogenes and the use of the phagocytosis inhibitor cytochalasin B suggest that events prior to invasion and escape of the bacteria from the phagosome into the cytoplasm enhance the nuclear transport of p50/p65 NF-kappa B components.

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