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A novel probiotic, Lactobacillus johnsonii 456, resists acid and can persist in the human gut beyond the initial ingestion period

  • 2018-12-22
  • Gut Microbes 10(4)
    • Michael J Davoren
    • Jared Liu
    • Jocelyn Castellanos
    • Norma I Rodríguez-Malavé
    • R. Schiestl


Probiotics are considered to have multiple beneficial effects on the human gastrointestinal tract, including immunomodulation, pathogen inhibition, and improved host nutrient metabolism. However, extensive characterization of these properties is needed to define suitable clinical applications for probiotic candidates. Lactobacillus johnsonii 456 (LBJ 456) was previously demonstrated to have anti-inflammatory and anti-genotoxic effects in a mouse model. Here, we characterize its resistance to gastric and bile acids as well as its ability to inhibit gut pathogens and adhere to host mucosa. While bile resistance and in vitro host attachment properties of LBJ 456 were comparable to other tested probiotics, LBJ 456 maintained higher viability at lower pH conditions compared to other tested strains. LBJ 456 also altered pathogen adhesion to LS 174T monolayers and demonstrated contact-dependent and independent inhibition of pathogen growth. Genome analyses further revealed possible genetic elements involved in host attachment and pathogen inhibition. Importantly, we show that ingestion of Lactobacillus johnsonii 456 over a one week yogurt course leads to persistent viable bacteria detectable even beyond the period of initial ingestion, unlike many other previously described probiotic species of lactic acid bacteria.

Keywords: Gut microbiota; bacteria; lactobacillus; microbiology; probiotics.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Lactobacillus johnsonii LJ09Improved Gut Microbial PersistenceBeneficial
Lactobacillus johnsonii LJ09Increased Acid ResistanceBeneficial
Lactobacillus johnsonii LJ09Reduced Enteropathogen ActivityBeneficial
Lactobacillus LBIncreased Microbial Viability in Human GutBeneficial
Lactobacillus LBReduced GenotoxicityBeneficial
Lactobacillus LBReduced Inflammation LevelsBeneficial
Lactobacillus LBReduced Pathogen GrowthBeneficial

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