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Infection and Immunity, December 2000, p. 7039-7048, Vol. 68, No. 12
Lehrstuhl für Mikrobiologie, Biozentrum
der Universität Würzburg, D-97074 Würzburg, Germany
Received 18 July 2000/Returned for modification 28 August
2000/Accepted 26 September 2000
Bordetella pertussis is readily killed after uptake by
professional phagocytes, whereas its close relative Bordetella
bronchiseptica is not and can persist intracellularly for days.
Phagocytosis of members of either species by a mouse macrophage cell
line results in transport of the bacteria to a phagosomal compartment
positive for the lysosome-associated membrane protein 1, the protease
cathepsin D, and the late endosomal vacuolar proton-pumping ATPase but
negative for the early endosome antigen 1 and the early endosomal
transferrin receptor. In addition, we demonstrate that
Bordetella-containing phagosomes rapidly acidify to pH 4.5 to 5.0. Taken together, these data demonstrate that
Bordetella-containing phagosomes rapidly mature to an
acidic late endosomal/lysosomal compartment. Following up on this
observation, we determined that B. pertussis does not survive in bacterial growth media adjusted to a pH of 4.5, whereas this
pH has only minor effects on the growth of B. bronchiseptica. Raising the intracellular pH in infected
macrophages by the addition of bafilomycin A1, ammonium
chloride, or monensin increases the survival of acid-sensitive B. pertussis but, surprisingly, decreases that of acid-tolerant
B. bronchiseptica. In summary, we hypothesize that the
differential survival of B. pertussis and B. bronchiseptica in macrophages is, at least in part, due to the
differences in their acid tolerance.
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Phagosome Acidification Has Opposite Effects on
Intracellular Survival of Bordetella pertussis and
B. bronchiseptica
*
Corresponding author. Mailing address: Lehrstuhl
für Mikrobiologie, Biozentrum, Am Hubland, D-97074
Würzburg, Germany. Phone: (931) 888 4403. Fax: (931) 888 4402. E-mail: roy{at}biozentrum.uni-wuerzburg.de.
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