How hypoxia affects microbiota metabolism in mice

Area of Science:

• Microbiology
• Metabolomics
• Animal Models

Background:

• Gut microbiota plays a crucial role in host metabolism and health.
• Obesity and hypoxic environments can significantly alter gut microbiota composition and function.
• Understanding these interactions is vital for developing targeted interventions.

Purpose of the Study:

• To investigate the relationship between gut microbiota and fecal metabolites in mice under hypoxic conditions.
• To explore how obesity and high altitude influence gut microbiota diversity and metabolic profiles.

Main Methods:

• Utilized high-fat diet-induced obese and normal diet mice exposed to high and low altitudes.
• Performed 16S rRNA gene sequencing for gut microbiota analysis.
• Conducted non-targeted fecal metabolomics using liquid chromatography-mass spectrometry.
• Analyzed data using statistical software (SIMCA, MetaboAnalyst, R).

Main Results:

• Hypobaric hypoxia significantly reduced body weight in obese mice.
• Gut microbiota diversity was lower in obese mice compared to normal weight mice.
• Specific bacteria (Faecalibaculum, Romboutsia, Lactobacillus) were associated with obesity, while Romboutsia was linked to hypoxia.
• Fecal metabolite profiles differed, with gut microbiota associated with nucleotide and amino acid metabolism in same body weight groups, and lipid and amino acid metabolism in same altitude groups.

Conclusions:

• Obesity is associated with reduced gut microbiota diversity.
• Romboutsia emerged as a dominant microbiota in hypoxic conditions.
• Gut microbiota composition influences host metabolism, with distinct associations observed based on body weight and altitude.