title: Autophagy protects C. elegans against necrosis during Pseudomonas aeruginosa infection.
abstract: Autophagy, a conserved pathway that delivers intracellular materials into lysosomes for degradation, is involved in development, aging, and a variety of diseases. Accumulating evidence demonstrates that autophagy plays a protective role against infectious diseases by diminishing intracellular pathogens, including bacteria, viruses, and parasites. However, the mechanism by which autophagy regulates innate immunity remains largely unknown. Here, we show that autophagy is involved in host defense against a pathogenic bacterium Pseudomonas aeruginosa in the metazoan Caenorhabditis elegans. P. aeruginosa infection induces autophagy via a conserved extracellular signal-regulated kinase (ERK). Intriguingly, impairment of autophagy does not influence the intestinal accumulation of P. aeruginosa, but instead induces intestinal necrosis. Inhibition of necrosis results in the survival of autophagy-deficient worms after P. aeruginosa infection. These findings reveal a previously unidentified role for autophagy in protection against necrosis triggered by pathogenic bacteria in C. elegans and implicate that such a function of autophagy may be conserved through the inflammatory response in diverse organisms.
authors.affiliation: Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming, Yunnan 650091, China.
authors.forename: Cheng-Gang
authors.initials: CG
authors.lastname: Zou
authors.affiliation: Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming, Yunnan 650091, China.
authors.forename: Yi-Cheng
authors.initials: YC
authors.lastname: Ma
authors.affiliation: Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming, Yunnan 650091, China.
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Dai
authors.affiliation: Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming, Yunnan 650091, China kqzhang@ynu.edu.cn.
authors.forename: Ke-Qin
authors.initials: KQ
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001343:Autophagy / Q000235:genetics / Q000276:immunology*; D017173:Caenorhabditis elegans / Q000235:genetics / Q000276:immunology* / Q000382:microbiology; D055785:Gene Knockdown Techniques; D017238:Genes, Helminth; D054884:Host-Pathogen Interactions / Q000276:immunology; D007113:Immunity, Innate / Q000235:genetics; D020935:MAP Kinase Signaling System / Q000276:immunology; D009154:Mutation; D009336:Necrosis; D011552:Pseudomonas Infections / Q000276:immunology* / Q000473:pathology; D011550:Pseudomonas aeruginosa / Q000276:immunology; D034622:RNA Interference
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