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Related Concept Videos

Actin Filament Depolymerization01:19

Actin Filament Depolymerization

Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...

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MAP4Ks drive cell death in response to Salmonella SpvB-induced actin depolymerization.

Mitchell A Pallett1, Romina Tocci1, Andrea Majstorovic1

  • 1Centre for Bacterial Resistance Biology, Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, United Kingdom.

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Pathogenic toxins that depolymerize actin trigger a novel cell death pathway. This atypical, caspase-independent cell death is regulated by MAP4K signaling, offering insights into bacterial virulence.

Keywords:
actincell deathhost–pathogen interactionspathogenesis

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Area of Science:

  • Microbiology
  • Cell Biology
  • Immunology

Background:

  • Pathogens utilize toxins to disrupt host actin cytoskeleton, often inducing cell death.
  • Mono-ADP-ribosyltransferases (mARTs) are key virulence factors, but their precise role in cell death remains unclear.
  • Host cell death is a defense mechanism, yet pathogens can manipulate it for survival.

Purpose of the Study:

  • To investigate the role of actin ribosylation in mART-induced cell death.
  • To elucidate the mechanism by which actin depolymerization leads to host cell death.
  • To identify host factors involved in sensing actin depolymerization and mediating cell death.

Main Methods:

  • Utilized *Salmonella enterica* Typhimurium and its mART SpvB.
  • Investigated cell death pathways using biochemical and cell imaging techniques.
  • Administered actin depolymerizing agent latrunculin A to compare pathways.

Main Results:

  • Actin ribosylation by SpvB is essential for inducing cell death.
  • Identified a novel cell death pathway involving MAP4K activation and JNK signaling.
  • Demonstrated that this pathway is distinct from apoptosis and conserved with latrunculin A treatment.
  • Observed vacuolization as a feature of this atypical cell death.

Conclusions:

  • MAP4K family members are critical sensors of actin depolymerization.
  • This identifies a conserved, atypical, caspase-independent cell death pathway.
  • Findings enhance understanding of bacterial pathogenesis and host cell death signaling.