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Some current concepts in intestinal bacteriology

W E Moore, E P Cato, L V Holdeman

    The American Journal of Clinical Nutrition
    |October 1, 1978
    PubMed
    Summary
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    Specific bacterial species proportions, not just genera, correlate with colon cancer risk. Stress, not diet, significantly alters gut flora composition, potentially impacting cancer development.

    Area of Science:

    • Microbiology
    • Gastroenterology
    • Oncology

    Background:

    • Colon cancer incidence is linked to fecal flora composition.
    • Bacterial species proportions, rather than genera, may be key indicators.
    • Fecal flora composition reflects the large colon's microbial environment.

    Purpose of the Study:

    • To investigate the correlation between specific bacterial species in fecal flora and colon cancer risk.
    • To understand how diet and stress influence gut microbial composition.
    • To explore the conversion of dietary substrates into potentially carcinogenic metabolites by gut bacteria.

    Main Methods:

    • Quantitative analysis of fecal flora in populations with varying colon cancer risk.
    • Sampling from different intestinal tract regions and intestinal wall scrapings.

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  • Monitoring flora composition under dietary changes and stress conditions.

    • Main Results:

    • Specific bacterial species proportions, not genera, correlate with colon cancer incidence.
    • Gut flora composition remained stable across the colon but was significantly altered by stress (anger/fear).
    • Drastic dietary changes did not significantly affect overall flora composition.

    Conclusions:

    • Fecal bacteria composition accurately represents the large colon flora.
    • Stress-induced shifts in bacterial species proportions may influence colon cancer risk.
    • Gut bacteria can metabolize dietary components into potentially carcinogenic compounds, warranting further investigation.