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Alterations in mouse fecal flora associated with hyperbaric stress
Undersea Biomedical Research
|March 1, 1981
Summary
Hyperbaric stress significantly reduced obligate anaerobes in mouse gut microbiota. This study investigated the impact of high pressure on fecal microflora composition in mice.
Area of Science:
- Microbiology
- Barobiology
- Gastroenterology
Background:
- Gut microbiota plays a crucial role in host health.
- Understanding the impact of environmental stressors on the microbiome is essential.
Purpose of the Study:
- To investigate the effects of hyperbaric stress on the composition of fecal microflora in mice.
- To quantify changes in bacterial populations under high-pressure conditions.
Main Methods:
- Mice were exposed to hyperbaric conditions (35 ATA) in a helium atmosphere or normobaric conditions (1 ATA).
- Fecal pellets were collected and cultured under anaerobic and aerobic conditions.
- Replica plating was used to assess bacterial populations, focusing on obligate anaerobes.
Main Results:
- A consistent reduction in the relative numbers of obligate anaerobes was observed in hyperbaric-exposed mice (from 71% to 44%).
- Bacteroides distasonis and B. multiacidus were identified as common obligate anaerobic species.
- No major changes in the overall species distribution were detected.
Conclusions:
- Hyperbaric stress demonstrably alters the gut microbial composition in mice, specifically reducing obligate anaerobic bacteria.
- Further research is needed to understand the physiological implications of these microbial shifts.