RANKL/OPG Axis and Bone Mineral Density in Pediatric Inflammatory Bowel Disease

Area of Science:

• Pediatric Endocrinology
• Gastroenterology
• Bone Metabolism

Background:

• Inflammatory bowel diseases (IBD), including Crohn's disease (CD) and ulcerative colitis (UC), can negatively impact bone metabolism in children.
• The RANKL/OPG axis is a critical regulator of bone turnover, but its role in pediatric IBD-related bone disturbances is not well-established.
• Limited data exist regarding bone metabolism and the RANKL/OPG axis in pediatric IBD patients.

Purpose of the Study:

• To investigate alterations in the RANKL/OPG axis in children with IBD.
• To assess bone mineral density (BMD) and its relationship with the RANKL/OPG axis in pediatric IBD.
• To identify potential biomarkers for skeletal health in children with IBD.

Main Methods:

• A prospective observational study involving 100 children (aged 4-18 years), with 72 diagnosed with IBD (27 CD, 45 UC) and 28 healthy controls.
• Evaluations included anthropometric measurements, biochemical markers of inflammation and bone turnover, and serum levels of RANKL and OPG.
• Bone mineral density (BMD) was assessed using Z-scores, and correlations between variables were analyzed.

Main Results:

• Children with CD exhibited significantly lower height and weight percentiles.
• Elevated serum RANKL and RANKL/OPG ratio were observed in IBD patients, particularly those with CD.
• IBD patients showed lower total body BMD Z-scores, with a notable percentage experiencing low BMD or values in the 'gray zone'.

Conclusions:

• Pediatric IBD is associated with significant dysregulation of the RANKL/OPG axis and reduced bone density.
• Findings suggest that the RANKL/OPG axis may serve as a potential biomarker for skeletal health in children with IBD.
• Early screening for bone health is warranted in pediatric IBD populations.