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Neuronal Goα and CAPS regulate behavioral and immune responses to bacterial pore-forming toxins

Ferdinand C O Los1, Christine Ha, Raffi V Aroian

  • 1University of California San Diego, Division of Biological Sciences, Section of cell and developmental biology, La Jolla, California, USA.

Plos One
|January 26, 2013
PubMed

Insights

Bacterial pore-forming toxins (PFTs) trigger rapid feeding cessation in C. elegans. This behavioral response, along with immune protection, involves neuronal signaling pathways.

Area of Science:

  • Microbiology
  • Neuroscience
  • Immunology

Background:

  • Pore-forming toxins (PFTs) are key bacterial virulence factors targeting host cell membranes.
  • Existing host defenses against PFTs operate locally at the site of attack.

Purpose of the Study:

  • To investigate host defense mechanisms against PFTs beyond direct cellular attack.
  • To characterize the role of the nervous system in responding to PFTs.

Main Methods:

  • Utilized Caenorhabditis elegans as a model organism.
  • Analyzed mutant strains to identify genetic requirements for PFT response.
  • Investigated neuronal signaling pathways involved in defense.

Main Results:

  • Discovered a rapid, complete feeding cessation in C. elegans upon PFT exposure.
  • Identified the neuronal G protein Goα subunit (goa-1) as essential for feeding inhibition.
  • Found that unc-31, a calcium activator for protein secretion (CAPS) homolog, is required for maintaining this response.
  • Demonstrated that goa-1 and unc-31 also play roles in immune protection against PFTs.

Conclusions:

  • Bacterial PFTs elicit a coordinated behavioral (feeding cessation) and immune response.
  • This response involves cross-talk between the nervous system and attacked cells.
  • Neuronal pathways, including goa-1 and unc-31, are critical for both behavioral and immune defense against PFTs.

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