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Immune-mediated indirect interaction between gut microbiota and bacterial pathogens.

Maryam Keshavarz1, Mathias Franz2, Haicheng Xie2

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Summary

The immune deficiency (Imd) pathway and its antimicrobial peptides (AMPs) do not mediate tripartite interactions between gut microbiota and pathogens. However, gut microbiota promote host survival during infection by increasing tolerance, not resistance.

Keywords:
Tenebrio molitorGut microbiotaHost–pathogen-microbiota interactionsImd-dependent antimicrobial peptidesRelish

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Area of Science:

  • Insect immunity
  • Microbiome research
  • Evolutionary biology

Background:

  • Host survival during infection relies on coordinated interactions between the immune system and gut microbiota.
  • The immune deficiency (Imd) pathway, regulating antimicrobial peptide (AMP) synthesis, is crucial for host-pathogen and host-microbiota interactions.
  • The role of Imd-dependent AMPs in mediating indirect interactions within a tripartite context (host-microbiota-pathogen) is not well understood.

Purpose of the Study:

  • To investigate whether Imd-dependent AMPs mediate indirect interactions between gut microbiota and pathogen infection in insects.
  • To explore the influence of the immune deficiency (Imd) pathway on host-microbiota-pathogen dynamics.

Main Methods:

  • RNAi-mediated knockdown of Tenebrio molitor Relish (TmRelish) was used to assess the function of Imd-dependent AMPs.
  • Gut microbiota load and composition were analyzed.
  • Pathogen load and host mortality were monitored during infection.

Main Results:

  • TmRelish knockdown disrupted gut microbiota, increased pathogen load, and led to higher host mortality.
  • No evidence was found that Imd-dependent AMPs mediate indirect interactions between gut microbiota and pathogen infection.
  • Pathogen infection increased gut microbiota load, stimulating some AMPs, but this did not reduce pathogen load.
  • Gut microbiota did not affect pathogen load but enhanced host survival, indicating increased tolerance.

Conclusions:

  • Imd-dependent AMPs may not be the primary mediators of tripartite interactions in this insect model.
  • Microbiota-host interactions, including immune priming and altered microbiota load, significantly influence infection outcomes.
  • These interactions exert selective pressures on the evolution of bacterial virulence.