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A decrease in iron availability to human gut microbiome reduces the growth of potentially pathogenic gut bacteria; an

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Iron availability significantly impacts gut bacteria. Iron depletion impairs pathogenic bacteria growth but spares beneficial species, altering gut microbial composition and function.

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Area of Science:

  • Microbiology
  • Human Gut Microbiome Research
  • Nutritional Science

Background:

  • Most ingested iron is unabsorbed, reaching the colon where it can fuel pathogenic bacterial growth.
  • Understanding iron's role in the gut is crucial for managing microbial balance and host health.

Purpose of the Study:

  • To investigate how iron availability affects human gut microbial composition and function.
  • To examine the impact of iron depletion on individual gut bacteria and the overall microbiome.

Main Methods:

  • Utilized an in vitro colonic fermentation model with human fecal microbiota.
  • Employed iron chelation using bathophenanthroline disulphonic acid (BPDS).
  • Analyzed microbial composition via 16S rRNA gene sequencing and metabolic function using 1H-NMR metabolomics.

Main Results:

  • Iron deficiency significantly inhibited the growth of pathogenic bacteria like Escherichia coli and Salmonella typhimurium.
  • Beneficial bacteria, such as Lactobacillus rhamnosus, showed no significant growth impairment under iron-depleted conditions.
  • Iron chelation led to decreased relative abundance of taxa including Escherichia and Bifidobacterium, and reduced short-chain fatty acid (SCFA) production.

Conclusions:

  • Iron is essential for gut microbial growth and metabolism.
  • Iron chelation alters gut microbiota composition and function, impacting microbial homeostasis.
  • Findings highlight iron's critical role in modulating the gut environment and bacterial populations.