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Changes in bone mineral density in rat adjuvant arthritis
T Takagi1, P W Tsao, R Totsuka
1Tanabe Seiyaku Co. Ltd., Lead Optimization Research Laboratory, Saitama, Japan.
Clinical Immunology and Immunopathology
|August 1, 1997
Summary
Freund's complete adjuvant injection in rats caused significant bone mineral density loss in both local and systemic sites. This bone loss affected both trabecular and cortical bone, impacting femur, tibia, and vertebrae.
Area of Science:
- Biomedical Science
- Orthopedics
- Immunology
Background:
- Inflammation can affect bone metabolism.
- Adjuvant-induced arthritis models are used to study inflammatory bone loss.
- Understanding the systemic effects of local inflammation on bone density is crucial.
Purpose of the Study:
- To investigate the impact of Freund's complete adjuvant injection on bone mineral density (BMD) in rats.
- To assess both local and systemic effects of adjuvant-induced inflammation on bone.
- To determine if bone loss affects trabecular and cortical bone structures.
Main Methods:
- Rats were divided into adjuvant-treated and control groups.
- Dual-energy X-ray absorptiometry (DXA) was used to measure BMD.
- BMD was assessed in the injected and non-injected limbs, as well as vertebrae.
Main Results:
- Adjuvant injection led to significant local BMD decrease in femur and tibia by Day 7.
- The non-injected limb showed a delayed and smaller BMD reduction.
- Both trabecular and cortical bone showed decreased BMD, with vertebrae affected by Day 21.
Conclusions:
- Systemic and local bone mineral density decreases occur following adjuvant injection.
- Inflammation induced by Freund's complete adjuvant impacts bone across different regions and types.
- This model provides insights into inflammatory bone loss mechanisms.