Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 387, Issue 2, Pages 272-277Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2009.06.152
Keywords
Macrophage; Mycobacterium tuberculosis; Rab7; Phagosome maturation; Phagolysosome biogenesis
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Ministry of Health, Labour and Welfare of Japan
- United States-Japan Cooperative Medical Science Committee
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The late endosomal marker Rab7 has been long believed to be absent from the phagosome containing Mycobacterium tuberculosis (M.tb) in macrophage, but the detail kinetics remains elusive. Here, we found that Rab7 is transiently recruited to and subsequently released from M.tb phagosomes. For further understanding of the effect of Rab7 dissociation from the phagosome, we examined the localization of lysosomal markers on the phagosome in the macrophage expressing a dominant-negative Rab7. The localization of lysosomal associated membrane protein-2 (LAMP-2) on the phagosome was Rab7-independent, while that of cathepsin D was Rab7-dependent. These results agree with the localization of each lysosomal marker on M.tb phagosome at 6 h postinfection-i.e., LAMP-2, but not cathepsin D localized on the majority of M.tb phagosomes. These results suggest that the dissociation of Rab7 from M.tb phagosome is the important process in inhibition of phagolysosome biogenesis. (C) 2009 Elsevier Inc. All rights reserved.
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