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Infection and Immunity, June 2002, p. 3264-3270, Vol. 70, No. 6
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.6.3264-3270.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Disruption of the Salmonella-Containing Vacuole Leads to Increased Replication of Salmonella enterica Serovar Typhimurium in the Cytosol of Epithelial Cells

John H. Brumell, Patrick Tang, Michelle L. Zaharik, and B. Brett Finlay*

Biotechnology Laboratory and Departments of Biochemistry and Molecular Biology, Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada

Received 11 October 2001/ Returned for modification 5 January 2002/ Accepted 10 March 2002

Salmonella enterica serovar Typhimurium is a facultative intracellular pathogen that inhabits a vacuolar compartment, called the Salmonella-containing vacuole (SCV), in infected host cells. Maintenance of the SCV is accomplished by SifA, and mutants of this Salmonella pathogenicity island 2 type III effector replicate more efficiently in epithelial cells. Here we demonstrate that enhanced replication of sifA mutants occurs in the cytosol of these cells. Increased replication of wild-type bacteria was also observed in cells treated with wortmannin or expressing Rab5 Q79L or Rab7 N125I, all of which caused a loss of SCV integrity. Our findings demonstrate the requirement of the host cell endosomal system for maintenance of the SCV and that loss of this compartment allows increased replication of serovar Typhimurium in the cytosol of epithelial cells.


* Corresponding author. Mailing address: Biotechnology Laboratory, University of British Columbia, Room 237, Wesbrook Building, 6174 University Blvd., Vancouver, BC, Canada V6T 1Z3. Phone: (604) 822-2210. Fax: (604) 822-9830. E-mail: bfinlay{at}interchange.ubc.ca.

Editor: A. D. O'Brien


Infection and Immunity, June 2002, p. 3264-3270, Vol. 70, No. 6
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.6.3264-3270.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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