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Bleomycin-induced arthritis and dermatitis in rats
1Drug Safety Administration Department, Daiichi Pharmaceutical Co., Ltd., Tokyo, Japan.
Toxicologic Pathology
|January 23, 1998
Summary
The antitumor drug bleomycin (BLM) causes inflammation and damage to rat joints and skin. Long-term effects include collagen damage in the deep dermis, indicating potential chronic toxicity.
Area of Science:
- Pharmacology
- Toxicology
- Rheumatology
Background:
- Bleomycin (BLM) is an antitumor agent with known toxicities.
- The effects of BLM on joint and dermal tissues are not fully understood.
Purpose of the Study:
- To investigate the toxic effects of bleomycin on the synovial membrane and periarticular deep dermis in young adult rats.
Main Methods:
- Subcutaneous administration of bleomycin (20 mg/kg) for 3 days to 10-wk-old rats.
- Histopathological examination of knee and tarsal joints, and plantar hindfoot/digital pulvini after a 4-wk recovery period.
Main Results:
- Bleomycin induced synovial membrane edema, mononuclear cell infiltration, and necrosis.
- Inflammation and collagen bundle degeneration were observed in the deep dermis.
- Young adult rats showed greater arthritis severity compared to juvenile rats.
Conclusions:
- Bleomycin exhibits toxicity towards synovial lining cells.
- The drug induces inflammation in the synovial membrane and periarticular dermis.
- Potential for long-term dermal collagen damage exists.