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Deprecated: Implicit conversion from float 229.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2015 ; 6 (ä): 6379 Nephropedia Template TP
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IRF8 directs stress induced autophagy in macrophages and promotes clearance of Listeria monocytogenes #MMPMID25775030
Gupta M; Shin DM; Ramakrishna L; Goussetis DJ; Platanias LC; Xiong H; Morse HC; Ozato K
Nat Commun 2015[]; 6 (ä): 6379 PMID25775030show ga
Autophagy, activated by many stresses, plays a critical role in innate immune responses. Here we show that Interferon Regulatory Factor 8 (IRF8) is required for expression of autophagy-related genes in dendritic cells. Furthermore in macrophages, IRF8 is induced by multiple autophagy-inducing stresses, including IFN? and toll like receptor stimulation, bacterial infection, starvation and by macrophage colony-stimulating factor. IRF8 directly activates many genes involved in various steps of autophagy, promoting autophagosome formation and lysosomal fusion. Consequently, Irf8-/- macrophages are deficient in autophagic activity, and excessively accumulate SQSTM1 and ubiquitin-bound proteins. We show that clearance of Listeria monocytogenes in macrophages requires IRF8-dependent activation of autophagy genes and subsequent autophagic capturing and degradation of Listeria antigens. These processes are defective in Irf8-/- macrophages where uninhibited bacterial growth ensues. Together, these data suggest that IRF8 is a major autophagy regulator in macrophages, essential for macrophage maturation, survival and innate immune responses.