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Infect. Immun., 04 1997, 1497-1504, Vol 65, No. 4
LP Barker, KM George, S Falkow and PL Small
We characterized the Mycobacterium marinum phagosome by using a variety of
endocytic markers to follow the path of the bacteria through a mouse
macrophage cell line. Using a laser confocal microscope, we found that the
majority of viable M. marinum cells were in nonacidic vacuoles that did not
colocalize with the vacuolar proton ATPase (V-ATPase), the
calcium-independent mannose-6-phosphate receptor (CI-M6PR), or cathepsin D.
In contrast, heat-killed organisms and latex beads were in acidic vacuoles
which contained the V-ATPase, the CI-M6PR, and cathepsin D. A population of
vesicles that contained live M. marinum labeled with the lysosomal
glycoprotein LAMP-1, but the percentage of vacuoles that labeled was lower
than for heat-killed organisms or latex beads. When testing live and
heat-killed Mycobacterium tuberculosis, we found levels of colocalization
with LAMP- and cathepsin D comparable to those for the M. marinum isolate.
We conclude that M. marinum, like M. tuberculosis, can circumvent the host
endocytic pathway and reside in an intracellular compartment which is not
acidic and does not fuse with lysosomes. In addition, we describe a system
for sampling a large population of intracellular organisms by using a laser
confocal microscope.
Copyright © 1997, American Society for Microbiology
Differential trafficking of live and dead Mycobacterium marinum organisms in macrophages
Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840, USA. LUBARKER@ATLAS.NIAID.NIH.GOV
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