Evasion and Interference: Intracellular Pathogens Modulate Caspase-dependent Inflammatory Responses

Overview

Journal Nat Rev Microbiol

Specialties Infectious Diseases
Microbiology

Date 2016 May 14

PMID 27174147

Citations 24

Authors

Mary K Stewart

Brad T Cookson

Affiliations

Soon will be listed here.

Abstract

Pathogens have evolved to complete the virulence cycle of colonization, replication and dissemination in intimate association with a complex network of extracellular and intracellular surveillance systems that guard tissue spaces. In this Review, we discuss the strategies used by bacteria and viruses to evade or inhibit intracellular detection that is coupled to pro-inflammatory caspase-dependent protective responses. Such strategies include alterations of lipopolysaccharide (LPS) structures, the regulated expression of components of type III secretion systems, and the utilization of proteins that inhibit inflammasome formation, the enzymatic activity of caspases and cytokine signalling. Inflammation is crucial in response to exposure to pathogens, but is potentially damaging and thus tightly regulated. The threshold for the activation of pro-inflammatory caspases is determined by the immediate stimulus in the context of previous signals. Pathogen, genetic and situational factors modulate this threshold, which determines the ability of the host to resist infection while minimizing harm.

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