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A noncanonical polyamine from bacteria antagonizes host mitochondrial function.

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Gut bacteria can produce a novel polyamine, N1-aminopropylagmatine (N1-APA), which disrupts intestinal cell function and may contribute to inflammatory bowel diseases by affecting mitochondrial stress responses.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Toxicology

Background:

  • Gut bacterial polyamines interact with intestinal cells, potentially influencing inflammatory bowel diseases (IBD).
  • Molecular mechanisms linking gut microbiome polyamine metabolism to IBD pathogenesis remain largely undefined.

Purpose of the Study:

  • To investigate the bioactivity of microbiome-derived polyamines using a model organism.
  • To elucidate the molecular mechanisms of polyamine intermediate N1-aminopropylagmatine (N1-APA) in intestinal cells.

Main Methods:

  • Utilized derivatization-based liquid chromatography-mass spectrometry (LC-MS).
  • Employed the model organism Caenorhabditis elegans and mouse bone marrow macrophages.
  • Investigated polyamine transport via the CATP-5 transporter.

Main Results:

  • Identified N1-aminopropylagmatine (N1-APA) as a noncanonical polyamine intermediate produced by Escherichia coli and Bacillus subtilis.
  • Demonstrated N1-APA bioactivity in C. elegans, antagonizing development and activating the mitochondrial unfolded protein response.
  • Showed N1-APA inhibits eIF5A hypusination and alternative macrophage activation, similar to deoxyhypusine synthase inhibitors.

Conclusions:

  • Bacterial N1-APA is a bioactive metabolite with potential roles in mitochondrial stress responses.
  • Aberrant gut microbiome polyamine metabolism, leading to N1-APA production, may contribute to IBD pathogenesis.
  • Further research is needed to identify all targets of N1-APA and its precise role in disease.