Different bone sites-specific response to diabetes rat models: Bone density, histology and microarchitecture

Area of Science:

• Endocrinology and Metabolic Diseases
• Orthopedics and Bone Research
• Diabetology

Background:

• Diabetes Mellitus (DM), a common metabolic disorder, is characterized by hyperglycemia.
• Type 1 Diabetes Mellitus (T1DM) is known to cause bone loss, but comparative studies across different skeletal sites are limited.

Purpose of the Study:

• To investigate and compare the extent and timeline of bone loss at multiple skeletal sites in a rat model of T1DM.
• To analyze the impact of T1DM on bone structure in the tibia, femur, spine, and mandible.

Main Methods:

• Induction of T1DM in Sprague Dawley rats using Streptozotocin (STZ).
• Assessment of bone mass loss at four skeletal sites (tibia, femur, spine, mandible) using micro-computed tomography (micro-CT) and histological analysis at 4, 8, and 12 weeks post-STZ injection.
• Comparison with a control group receiving saline injections.

Main Results:

• The tibia exhibited the most significant bone loss, with bone volume fraction (BV/TV) decreasing substantially over time.
• The femur, mandible, and spine showed less pronounced bone loss initially, with significant reductions observed at later time points (8 and 12 weeks).
• Areas with denser trabecular bone were affected to a lesser extent and at a later stage compared to the tibia.

Conclusions:

• T1DM significantly impacts bone structure across various skeletal sites.
• The rate and severity of bone loss differ among skeletal sites, with the tibia being most vulnerable.
• Findings highlight the differential susceptibility of bone regions to T1DM-induced osteopathy.