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Related Concept Videos

Probiotics01:22

Probiotics

Probiotics are live, non-pathogenic microorganisms that confer health benefits by modulating the gut microbiota. The human gastrointestinal tract harbors a complex microbial ecosystem, and the balance of this microbiota is crucial for digestive and systemic health. Among the most extensively studied and utilized probiotics are species formerly classified within the genera Lactobacillus and Bifidobacterium. These organisms not only naturally colonize the human gut but are also consumed through...
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Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
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Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...

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Bacillus subtilis Intraspecies Interactions Shape Probiotic Activity Against Salmonella Typhimurium.

Eva Kovačec1, Barbara Kraigher1, Eli Podnar1

  • 1Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia.

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|December 24, 2024
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Interactions between Bacillus subtilis strains significantly impact their probiotic effectiveness against Salmonella Typhimurium. Mixing strains can reduce pathogen inhibition, with some strains dominating others.

Keywords:
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Area of Science:

  • Microbiology
  • Probiotics Research
  • Bacterial Interactions

Background:

  • Commercial probiotics frequently use multi-strain formulations.
  • The impact of intraspecies strain interactions on probiotic efficacy is often overlooked.
  • These interactions can influence higher-order effects on pathogens.

Purpose of the Study:

  • To evaluate the probiotic potential of Bacillus subtilis strains against Salmonella Typhimurium.
  • To investigate the effects of intraspecies Bacillus subtilis strain interactions on Salmonella Typhimurium inhibition.

Main Methods:

  • Screening of 39 Bacillus subtilis strains for inhibition of Salmonella Typhimurium in single-strain cultures.
  • Testing mixed cultures of Bacillus subtilis strains with varying inhibitory potencies.
  • Observing competitive exclusion dynamics between aggressive and less aggressive Bacillus subtilis strains.

Main Results:

  • 38 out of 39 Bacillus subtilis strains demonstrated significant inhibition of Salmonella Typhimurium.
  • Mixing potent Bacillus subtilis strains with less effective ones reduced pathogen inhibition.
  • Intraspecies competition was observed, with some Bacillus subtilis strains eliminating others in mixed cultures.

Conclusions:

  • Intraspecies interactions among Bacillus subtilis strains critically modulate probiotic activity against Salmonella Typhimurium.
  • The efficacy of multi-strain probiotics is influenced by complex strain-specific interactions.
  • Future development of multi-strain probiotics must account for these intraspecies dynamics.