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Cholinergic receptor-Wnt pathway controls immune activation by sensing intestinal dysfunction.

Jie Ren1, Yu Sang1, Alejandro Aballay1

  • 1Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, OR, USA.

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|November 2, 2022
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Summary

The C. elegans ACC-4 acetylcholine receptor is crucial for regulating immune responses to gut disturbances and pathogen infections. This research reveals a gut-brain-microbial pathway involving neural signaling and Wnt to control immunity.

Keywords:
ACC-4C. elegansCP: ImmunologyRIM neuronWntacetylcholinecholinergic receptorintestinal distension

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Area of Science:

  • Neuroimmunology
  • Microbial Pathogenesis
  • Host-Microbe Interactions

Background:

  • Pathogen colonization and intestinal dysfunction trigger immune activation.
  • Understanding the mechanisms controlling immune responses in the gut is essential for host defense.

Purpose of the Study:

  • To identify genetic factors regulating immune activation in response to intestinal homeostasis alterations.
  • To elucidate the role of the Caenorhabditis elegans ACC-4 acetylcholine receptor in immune control.

Main Methods:

  • Forward genetic screen for suppressors of immune activation.
  • Analysis of immune gene regulation and host immune response pathways.
  • Investigating the role of ACC-4 in non-cholinergic neurons.

Main Results:

  • C. elegans ACC-4 is required for immune activation during defecation defects and pathogen infection.
  • ACC-4 functions postsynaptically in RIM neurons to modulate immune gene expression.
  • ACC-4 regulates a Wnt-mediated host immune response.

Conclusions:

  • A gut-brain-microbial axis controls immune activation.
  • Neural cholinergic signaling and the Wnt pathway are key components of this axis.
  • ACC-4 plays a vital role in maintaining intestinal homeostasis and host immunity.