Switching Rho GTPase Activation into Effective Antibacterial Defenses Requires the Caspase-1/IL-1beta Signaling Axis

Overview

Journal Small GTPases

Specialties Biochemistry
Cell Biology

Date 2015 Oct 23

PMID 26492464

Citations 4

Authors

Laurent Boyer

Emmanuel Lemichez

Affiliations

Soon will be listed here.

Abstract

The monitoring of the activation state of Rho GTPases has emerged as a potent innate immune mechanism for detecting pathogens. In the March issue of PLOS Pathogens, we show that the activation of Rho GTPases by the CNF1 toxin during E. coli-triggered bacteremia leads to a GR1(+)cell-mediated efficient bacterial clearing and improves host survival. Host alarm requires the Caspase-1/IL-1beta signaling axis. Furthermore, we discover that pathogenic bacteria have the capacity to block immune responses via the expression of the α-hemolysin pore-forming toxin. In this commentary, we will comment on these findings and highlight the questions raised by this example of attack-defense mechanisms used alternatively by the pathogen and the host during blood infection.

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