Dynamic life and death interactions between Mycobacterium smegmatis and J774 macrophages

Title data

Anes, Elsa ; Peyron, Pascale ; Staali, Leila ; Jordao, Luisa ; Gutierrez, Maximiliano G. ; Kress, Holger ; Hagedorn, Monica ; Maridonneau-Parini, Isabelle ; Skinner, Mhairi A. ; Wildeman, Alan G. ; Kalamidas, Stefanos A. ; Kuehnel, Mark ; Griffiths, Gareth:
Dynamic life and death interactions between Mycobacterium smegmatis and J774 macrophages.
In: Cellular Microbiology. Vol. 8 (2006) Issue 6 . - pp. 939-960.
ISSN 1462-5822
DOI: https://doi.org/10.1111/j.1462-5822.2005.00675.x

Official URL:

Abstract in another language

Summary After internalization into macrophages non-pathogenic mycobacteria are killed within phagosomes. Pathogenic mycobacteria can block phagosome maturation and grow inside phagosomes but under some conditions can also be killed by macrophages. Killing mechanisms are poorly understood, although phago-lysosome fusion and nitric oxide (NO) production are implicated. We initiated a systematic analysis addressing how macrophages kill ‘non-pathogenic’Mycobacterium smegmatis. This system was dynamic, involving periods of initial killing, then bacterial multiplication, followed by two additional killing stages. NO synthesis represented the earliest killing factor but its synthesis stopped during the first killing period. Phagosome actin assembly and fusion with late endocytic organelles coincided with the first and last killing phase, while recycling of phagosome content and membrane coincided with bacterial growth. Phagosome acidification and acquisition of the vacuolar (V) ATPase followed a different pattern coincident with later killing phases. Moreover, V-ATPase localized to vesicles distinct from classical late endosomes and lysosomes. Map kinase p38 is a crucial regulator of all processes investigated, except NO synthesis, that facilitated the host for some functions while being usurped by live bacteria for others. A mathematical model argues that periodic high and low cellular killing activity is more effective than is a continuous process.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics VI - Biologial Physics > Professor Experimental Physics VI - Biologial Physics - Univ.-Prof. Dr. Holger Kreß Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics VI - Biologial Physics
Result of work at the UBT:	No
DDC Subjects:	500 Science > 530 Physics 500 Science > 570 Life sciences, biology
Date Deposited:	26 Feb 2021 08:55
Last Modified:	17 Aug 2023 11:51
URI:	https://eref.uni-bayreuth.de/id/eprint/63435