Gut microbiota can affect bone quality by regulating serum estrogen levels.

Area of Science:

• Microbiology
• Endocrinology
• Orthopedics

Background:

• Gut microbiota plays a role in bone development, but mechanisms are unclear.
• Germ-free (GF) animals and antibiotic models are used to study gut microbiota-host interactions.
• Understanding these interactions is crucial for bone health.

Purpose of the Study:

• To investigate the effect of antibiotic-induced gut microbiota disruption on bone development in mice.
• To explore the underlying mechanisms, particularly the role of sex hormones.

Main Methods:

• Long-term antibiotic administration to mice.
• Analysis of gut microbiota composition.
• Assessment of bone mineral density and trabecular microstructure.
• Measurement of serum estrogen levels.

Main Results:

• Antibiotic treatment significantly altered gut microbiota composition.
• Reduced bone mineral density in the spine and changes in trabecular microstructure were observed.
• A significant decrease in serum estrogen levels was found in antibiotic-treated mice.

Conclusions:

• Gut microbiota disruption by antibiotics negatively impacts bone development in mice.
• The effect may be mediated by the regulation of serum estrogen levels.
• Findings suggest a link between gut dysbiosis, sex hormones, and bone health, offering insights into osteoporosis treatment.