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J. Med. Microbiol. -- Vol. 49 (2000), 681-683
© 2000 Society for General Microbiology
ISSN 0022-2615

BACTERIAL PATHOGENICITY

Modulation of actA gene expression in Listeria monocytogenes by iron

MARIA PIA CONTE, C. LONGHI, G. PETRONE, M. POLIDORO, P. VALENTI* and L. SEGANTI

Institute of Microbiology, University of Rome ‘La Sapienza', Rome and *Institute of Microbiology, II University of Naples, Naples, Italy

Corresponding author: Dr M. P. Conte.

Received 8 June 1999; revised version accepted 4 Dec. 1999.

Abstract

This study analysed the invasiveness of Listeria monocytogenes into enterocyte-like Caco-2 cells in which iron depletion was achieved by picolinic acid treatment. Both entry and intracellular multiplication varied depending on the endogenous iron content of bacterial and eukaryotic cells. The behaviour within enterocytes was correlated with a 10-fold increased transcription of the actA gene observed in bacterial cells grown under conditions of iron stress.




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