IngentaConnect Autophagy, an immunologic magic bullet: Mycobacterium tuberculosi...

Author: Deretic, Vojo

Source: Future Microbiology, Volume 3, Number 5, October 2008 , pp. 517-524(8)

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Future Microbiology provides cutting-edge coverage of advances our understanding of microbial organisms and corresponding treatment strategies and agents in infectious disease. The journal also addresses the molecular basis of disease, epidemiologic trends and advanced diagnostic technologies.
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Abstract:

Mycobacterium tuberculosis is a facultative intracellular pathogen that parasitizes host macrophages where it persists in immature phagosomes by avoiding their maturation into phagolysosomes. The mechanisms of how M. tuberculosis inhibits phagolysosome biogenesis have been researched in detail and the maturation block at least partially depends on the manipulation of host phosphoinositide interconversions, with phosphatidylinositol 3-phosphate (PI3P) being a central target since it has been shown to be required for phagolysosome biogenesis. PI3P earmarks intracellular organelles for binding and assembly of effector molecules that interact with PI3P or its derivatives, including Class E Vps proteins such as Hrs and ESCRT components, early endosome antigen 1, which are required for sequential protein and membrane sorting within the endosomal and, by extension, phagosomal systems. In a search of a cellular mechanism that can bypass the tubercule bacillus-imposed PI3P block, researchers have uncovered a new general bactericidal process, autophagy, which can eliminate intracellular pathogens. This is a new, rapidly growing field replete with possibilities for novel, previously untried immunologic and pharmacologic interventions applicable not only to TB but to other stubborn bacterial, parasitic and viral diseases.

Keywords: autophagy; macrophage; phagosome; phosphoinositide; Rab; tuberculosis

Document Type: Research article

DOI: 10.2217/17460913.3.5.517

Autophagy, an immunologic magic bullet: Mycobacterium tuberculosis phagosome maturation block and how to bypass it