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Updated: Sep 14, 2025

Methods for Facilitating Microbial Growth on Pulp Mill Waste Streams and Characterization of the Biodegradation Potential of Cultured Microbes
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Microbial trash to metabolic treasure.

Alexander S Dowdell1,2, Sean P Colgan1,2

  • 1Mucosal Inflammation Program and Division of Gastroenterology and Hepatology, Department of Medicine, University of Colorado, Aurora, CO, USA.

Immunometabolism (Cobham, Surrey)
|July 23, 2025
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Summary
This summary is machine-generated.

Macrophages incorporate bacterial biomolecules, with living bacteria promoting inflammation and dead bacteria enabling nutrient recycling. This study reveals how bacterial state dictates macrophage metabolic fate.

Keywords:
AMPKautophagydendritic cellmTORC1macrophageneutrophilphagocytosis

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Area of Science:

  • Immunology
  • Metabolism
  • Microbiology

Background:

  • Macrophages are key immune cells that engulf and degrade pathogens.
  • Understanding the metabolic fate of phagocytosed bacterial components is crucial for immune response and host-pathogen interactions.

Purpose of the Study:

  • To investigate the molecular fate of phagocytosed bacterial contents within host macrophages.
  • To determine how the state of phagocytosed bacteria (living vs. dead) influences macrophage metabolism.

Main Methods:

  • Stable isotope labeling of bacterial biomolecules (amino acids, metabolites).
  • Mass spectrometry to track the incorporation of labeled molecules into host macrophages.
  • Analysis of macrophage metabolic reprogramming based on bacterial state.

Main Results:

  • Bacterial biomolecules are incorporated into host macrophage biomolecules.
  • Living phagocytosed bacteria induce a pro-inflammatory metabolic program in macrophages.
  • Dead phagocytosed bacteria trigger a "recycling" metabolic program, salvaging bacterial components.

Conclusions:

  • The metabolic fate of phagocytosed bacteria is dependent on their viability.
  • Macrophages can utilize dead bacterial contents for their own metabolic needs, shifting away from inflammation.
  • This work provides insights into host-pathogen metabolic interplay and immune regulation.