The maternal microbiome promotes placental development in mice

Area of Science:

• Reproductive biology
• Microbiome research
• Developmental biology

Background:

• The maternal microbiome significantly influences pregnancy outcomes.
• The placenta's development and function are critical for fetal growth.
• The specific role of the maternal gut microbiota in placental development is largely unknown.

Purpose of the Study:

• To investigate the impact of the maternal gut microbiota on placental development in mice.
• To identify mechanisms by which the maternal gut microbiota influences placental growth and vascularization.

Main Methods:

• Mice models with depleted maternal gut microbiota were used.
• Placental growth and feto-placental vascularization were assessed.
• Metabolomic analysis of maternal and fetal circulation was performed.
• In vitro endothelial cell assays and in vivo supplementation studies with short-chain fatty acids (SCFAs) were conducted.

Main Results:

• Depletion of maternal gut microbiota led to restricted placental growth and impaired vascularization.
• Maternal gut microbiota influenced metabolite levels in both maternal and fetal circulation.
• Short-chain fatty acids (SCFAs) promoted endothelial cell tube formation in vitro.
• SCFA supplementation in microbiota-deficient mice and during maternal malnutrition prevented placental abnormalities.

Conclusions:

• The maternal gut microbiome is essential for supporting placental development and vascularization in mice.
• Short-chain fatty acids (SCFAs) are key mediators of the maternal gut microbiome's beneficial effects on the placenta.
• Maintaining a healthy maternal gut microbiome is vital for optimal pregnancy outcomes.