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2015 ; 6
(ä): 498
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IL-17A Promotes Intracellular Growth of Mycobacterium by Inhibiting Apoptosis of
Infected Macrophages
#MMPMID26483789
Cruz A
; Ludovico P
; Torrado E
; Gama JB
; Sousa J
; Gaifem J
; Appelberg R
; Rodrigues F
; Cooper AM
; Pedrosa J
; Saraiva M
; Castro AG
Front Immunol
2015[]; 6
(ä): 498
PMID26483789
show ga
The fate of infected macrophages is a critical aspect of immunity to
mycobacteria. By depriving the pathogen of its intracellular niche, apoptotic
death of the infected macrophage has been shown to be an important mechanism to
control bacterial growth. Here, we show that IL-17 inhibits apoptosis of
Mycobacterium bovis BCG- or Mycobacterium tuberculosis-infected macrophages thus
hampering their ability to control bacterial growth. Mechanistically, we show
that IL-17 inhibits p53, and impacts on the intrinsic apoptotic pathway, by
increasing the Bcl2 and decreasing Bax expression, decreasing cytochrome c
release from the mitochondria, and inhibiting caspase-3 activation. The same
effect of IL-17 was observed in infected macrophages upon blockade of p53 nuclear
translocation. These results reveal a previously unappreciated role for the
IL-17/p53 axis in the regulation of mycobacteria-induced apoptosis and can have
important implications in a broad spectrum of diseases where apoptosis of the
infected cell is an important host defense mechanism.