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Salmonella Typhimurium disrupts Sirt1/AMPK checkpoint control of mTOR to impair autophagy.
Ganesan, Raja; Hos, Nina Judith; Gutierrez, Saray; Fischer, Julia; Stepek, Joanna Magdalena; Daglidu, Evmorphia; Krönke, Martin; Robinson, Nirmal.
Afiliación
  • Ganesan R; Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Cologne, Germany.
  • Hos NJ; Cologne Cluster of Excellence in Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
  • Gutierrez S; Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Cologne, Germany.
  • Fischer J; Cologne Cluster of Excellence in Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
  • Stepek JM; German Center for Infection Research (DZIF), Cologne, Germany.
  • Daglidu E; Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Cologne, Germany.
  • Krönke M; Cologne Cluster of Excellence in Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
  • Robinson N; Cologne Cluster of Excellence in Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
PLoS Pathog ; 13(2): e1006227, 2017 02.
Article en En | MEDLINE | ID: mdl-28192515
During intracellular infections, autophagy significantly contributes to the elimination of pathogens, regulation of pro-inflammatory signaling, secretion of immune mediators and in coordinating the adaptive immune system. Intracellular pathogens such as S. Typhimurium have evolved mechanisms to circumvent autophagy. However, the regulatory mechanisms targeted by S. Typhimurium to modulate autophagy have not been fully resolved. Here we report that cytosolic energy loss during S. Typhimurium infection triggers transient activation of AMPK, an important checkpoint of mTOR activity and autophagy. The activation of AMPK is regulated by LKB1 in a cytosolic complex containing Sirt1 and LKB1, where Sirt1 is required for deacetylation and subsequent activation of LKB1. S. Typhimurium infection targets Sirt1, LKB1 and AMPK to lysosomes for rapid degradation resulting in the disruption of the AMPK-mediated regulation of mTOR and autophagy. The degradation of cytosolic Sirt1/LKB1/AMPK complex was not observed with two mutant strains of S. Typhimurium, ΔssrB and ΔssaV, both compromising the pathogenicity island 2 (SPI2). The results highlight virulence factor-dependent degradation of host cell proteins as a previously unrecognized strategy of S. Typhimurium to evade autophagy.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Infecciones por Salmonella / Autofagia / Proteínas Quinasas Activadas por AMP / Sirtuina 1 / Serina-Treonina Quinasas TOR Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: PLoS Pathog Año: 2017 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Infecciones por Salmonella / Autofagia / Proteínas Quinasas Activadas por AMP / Sirtuina 1 / Serina-Treonina Quinasas TOR Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: PLoS Pathog Año: 2017 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos