Integrin-Dependent Engulfment of Yersinia enterocolitica by Macrophages Is Coupled to the Activation of Autophagy and Suppressed by Type III Protein Secretion
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Beta1 integrin-dependent engulfment of Yersinia enterocolitica by macrophages is coupled to the activation of autophagy and suppressed by type III protein secretion.
Autophagy is a central lysosomal degradation process that is essential for the maintenance of cellular homeostasis. Autophagy has furthermore emerged as integral part of the host immune response. Autophagic processes promote the separation and degradation of intracellular microorganisms which contributes to the development of innate and adaptive immunity. Some pathogenic microbes have therefore...
متن کاملA program of Yersinia enterocolitica type III secretion reactions is activated by specific signals.
Successful establishment of Yersinia infections requires the type III machinery, a protein transporter that injects virulence factors (Yops) into macrophages. It is reported here that the Yersinia type III pathway responds to environmental signals by transporting proteins to distinct locations. Yersinia enterocolitica cells sense an increase in extracellular amino acids (glutamate, glutamine, a...
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The enteropathogenic Yersinia strains are known to downregulate signaling pathways in macrophages by effectors of the type III secretion system, in which YopJ/YopP plays a crucial role. The adverse effects of Yersinia pestis, the causative agent of plague, were examined by infecting J774A.1 cells, RAW264.7 cells, and primary murine macrophages with the EV76 strain and with the fully virulent Ki...
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Yersinia outer protein J (YopJ) is a type III secretion system (T3SS) effector of pathogenic Yersinia (Yersinia pestis, Yersinia enterocolitica and Yersinia pseudotuberculosis) that is secreted into host cells. YopJ inhibits survival response pathways in macrophages, causing cell death. Allelic variation of YopJ is responsible for differential cytotoxicity in Yersinia strains. YopJ isoforms in ...
متن کاملYersinia enterocolitica differentially modulates RhoG activity in host cells.
Pathogenic bacteria of the genus Yersinia (Y. pestis, Y. enterocolitica and Y. pseudotuberculosis) have evolved numerous virulence factors (termed a stratagem) to manipulate the activity of Rho GTPases. Here, we show that Y. enterocolitica modulates RhoG, an upstream regulator of other Rho GTPases. At the contact site of virulent Y. enterocolitica and host cells, we could visualise spatiotempor...
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تاریخ انتشار 2009