Leptin-deficient mice have altered three-dimensional growth plate histomorphometry

Area of Science:

• Endocrinology
• Bone Biology
• Developmental Biology

Background:

• Leptin regulates energy homeostasis and bone growth.
• Leptin deficiency (ob/ob mice) causes obesity, diabetes, and bone abnormalities.
• Growth plate cartilage structure in obese diabetic adolescents is not well understood.

Purpose of the Study:

• To investigate the effects of leptin deficiency on growth plate cartilage microstructure in juvenile ob/ob mice.
• To test the hypothesis that leptin deficiency affects growth plate cartilage microstructure.

Main Methods:

• Compared tibial growth plate cartilage structure in lean and obese, leptin-deficient (ob/ob) female mice (10 weeks old).
• Utilized confocal laser scanning microscopy for 3D histological analysis of growth plate cartilage.
• Performed histomorphometric comparisons between juvenile lean and ob/ob mice.

Main Results:

• Obese mice exhibited significantly reduced tibial length and growth plate height compared to lean mice.
• Obese mice had fewer chondrocyte columns within the growth plate cartilage.
• Reduced chondrocyte cell volume was observed in obese mice relative to lean controls.

Conclusions:

• Data elucidate the link between growth plate cartilage structure and bone health in juvenile obese diabetic mice.
• Findings indicate that obesity and diabetes may negatively impact growth plate cartilage structure.
• Leptin deficiency adversely affects long bone development and growth plate microstructure.