In vitro studies on colonization resistance of the human gut microbiota to Candida albicans and the effects of tetracycline and Lactobacillus plantarum LPK.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory study using a continuous-flow model of the human colon.
What was done
Researchers used an anaerobic three-vessel continuous-flow culture system modeling the three anatomical regions of the human colon to examine Candida albicans persistence in the presence of fecal microbiota. They evaluated baseline colonization resistance during steady-state conditions, assessed the effect of adding the antibiotic tetracycline on C. albicans growth, and tested the impact of supplementing the system with the probiotic Lactobacillus plantarum LPK.
What was found
The abstract reports no exact numerical values or statistics. During steady-state conditions with established fecal microbiota, growth of C. albicans was prevented. Addition of tetracycline led to significant growth of C. albicans. Subsequent addition of L. plantarum LPK markedly reduced C. albicans cell counts, though it did not completely eradicate the fungus.
Why it matters
This study provides mechanistic in vitro evidence that intact colonic microbiota prevents C. albicans overgrowth, that broad-spectrum antibiotic exposure can compromise this barrier, and that specific probiotic lactobacilli can partially restore colonization resistance.
Limits
The study is entirely in vitro and cannot fully capture host mucosal immunity, transit dynamics, or in vivo human physiology. The abstract provides no quantitative data, bacterial or fungal cell concentrations, statistical significance values, or details regarding the number and diversity of fecal donors used to seed the model.
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