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Departments of Molecular Microbiology and
Physiology and Cell Biology, Washington University, School of Medicine, St. Louis, MO 63110
Mycobacterium avium (MAC) organisms multiply in
phagosomes that have restricted fusigenicity with lysosomes, do not
acidify due to a paucity of vacuolar proton-ATPases, yet remain
accessible to recycling endosomes. During the course of mycobacterial
infections, IFN-
-mediated activation of host and bystander
macrophages is a key mechanism in the regulation of bacterial growth.
Here we demonstrate that in keeping with earlier studies, cytokine
activation of host macrophages leads to a decrease in MAC viability,
demonstrable by bacterial esterase staining with fluorescein diacetate
as well as colony-forming unit counts from infected cells. Analysis of
the pH of MAC phagosomes demonstrated that the vacuoles in activated
macrophages equilibrate to pH 5.2, in contrast to pH 6.3 in resting
phagocytes. Biochemical analysis of MAC phagosomes from both resting
and activated macrophages confirmed that the lower intraphagosomal pH
correlated with an increased accumulation of proton-ATPases.
Furthermore, the lower pH is reflected in the transition of MAC
phagosomes to a point no longer accessible to transferrin, a marker of
the recycling endosomal system. These alterations parallel the
coalescence of bacterial vacuoles from individual bacilli in single
vacuoles to communal vacuoles with multiple bacilli. These data
demonstrate that bacteriostatic and bactericidal activities of
activated macrophages are concomitant with alterations in the
physiology of the mycobacterial phagosome.
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