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  11. Ingestion Of Bacillus Cereus Spores Dampens The Immune Response To Favor Bacterial Persistence

Ingestion of Bacillus cereus spores dampens the immune response to favor bacterial persistence

Salma Hachfi1,2, Alexandra Brun-Barale1, Arnaud Fichant1,3

  • 1Université Côte d'Azur, CNRS, INRAE, ISA, Sophia Antipolis, France.

Nature Communications
|September 4, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Bacillus cereus spores persist in the gut by evading immune defenses. Germinating in the intestine, these spores dampen immune responses, allowing bacterial survival and causing foodborne illness symptoms.

Area of Science:

  • Microbiology
  • Immunology
  • Gastroenterology

Background:

  • Bacillus cereus group bacteria are common causes of foodborne illness.
  • The mechanisms by which Bacillus cereus spores cause disease are not well understood.
  • Spores are highly resistant dormant bacterial forms.

Purpose of the Study:

  • To investigate the interaction between Bacillus cereus spores and the host immune system in the gut.
  • To elucidate the mechanisms of Bacillus cereus spore persistence in the intestine.
  • To understand how Bacillus cereus spores contribute to foodborne illness pathogenesis.

Main Methods:

  • Utilized Drosophila melanogaster as a model organism to study intestinal immunity.
  • Administered Bacillus cereus vegetative cells and spores to flies.

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  • Monitored bacterial persistence and host immune responses (Imd and Toll pathways).
  • Analyzed gene expression related to immune regulation, including amidases.

    • Main Results:

    • Ingested Bacillus cereus vegetative cells were rapidly cleared by the fly intestine.
    • Bacillus cereus spores persisted in the fly intestine for at least 10 days.
    • Spores did not germinate in the immune-rich anterior intestine but germinated in the posterior intestine.
    • Germination in the posterior intestine activated Imd and Toll pathways, inducing immune-dampening amidases.
    • This immune suppression facilitated Bacillus cereus bacterial persistence.

    Conclusions:

    • Bacillus cereus spores can hijack host intestinal immune defenses for their own persistence.
    • Germination in the posterior intestine and subsequent immune dampening is a key mechanism for Bacillus cereus pathogenesis.
    • This study reveals a novel strategy employed by Bacillus cereus spores to cause foodborne illness.