Strain- and sex-specific differences in intestinal microhemodynamics and gut microbiota composition

Area of Science:

• Physiology
• Microbiology
• Genetics

Background:

• Intestinal microcirculation is vital for nutrient exchange and physiological integrity.
• Understanding factors influencing microhemodynamics is crucial.

Purpose of the Study:

• To investigate the interplay between intestinal microhemodynamics, genetic background, sex, and gut microbial composition.
• To determine how gut microbiota influences microhemodynamic patterns.

Main Methods:

• Utilized laser Doppler flowmetry and wavelet transform analysis to assess microhemodynamic oscillations in different mouse strains.
• Employed 16S rRNA gene sequencing for microbial profiling.
• Administered antibiotics to evaluate microbiota depletion effects and performed immunohistochemistry for specific protein expression (PECAM-1, ESR1, ESR2).

Main Results:

• Observed strain-dependent and sex-related differences in microhemodynamic profiles and gut microbiota.
• Found significant correlations between gut microbiota composition and microhemodynamic parameters.
• Antibiotic treatment altered blood perfusion and velocity, with sex-specific effects, and modulated endothelial function.

Conclusions:

• Genetic background and sex are key determinants of intestinal microhemodynamics and gut microbiota in mice.
• A strong correlation exists between intestinal microhemodynamics and gut bacterial community dynamics.