Colitis-induced bone loss is gender dependent and associated with increased inflammation

Area of Science:

• Immunology
• Gastroenterology
• Bone Biology

Background:

• Inflammatory bowel disease (IBD) patients face higher risks of bone loss and fractures.
• Experimental models are crucial for understanding IBD's impact on bone health.

Purpose of the Study:

• To investigate the effects of experimental inflammatory bowel disease (IBD) on bone health in a murine model.
• To determine if gender influences the immunopathological consequences of colitis and bone loss.

Main Methods:

• Utilized a mouse model of colitis involving Helicobacter hepaticus infection in interleukin-10-deficient animals.
• Examined molecular and histological characteristics of bone and intestine in male and female mice.
• Assessed bone loss, osteoblast markers, colitis severity, inflammatory cytokines, and bacterial load.

Main Results:

• Significant trabecular bone loss occurred in male mice at 6 weeks post-infection, but not in female mice.
• Helicobacter hepaticus infection suppressed osteoblast markers exclusively in male mice.
• Male mice exhibited more severe colitis and higher levels of inflammatory cytokines, with increased bacterial load, suggesting gender-specific pathogen survival.

Conclusions:

• Colitis severity and associated bone loss induced by Helicobacter hepaticus are regulated by gender.
• Gender-specific differences in H. hepaticus colonization and subsequent immunopathological responses likely underlie these findings.