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Lead exposure inhibits fracture healing and is associated with increased chondrogenesis, delay in cartilage
Jonathan J Carmouche1, J Edward Puzas, Xinping Zhang
1Center for Musculoskeletal Research, University of Rochester Medical Center , University of Rochester, School of Medicine and Dentistry, Rochester, New York 14642, USA.
Environmental Health Perspectives
|June 3, 2005
Summary
Lead exposure significantly delays bone fracture healing, even at low doses. High lead concentrations can result in fibrous nonunions, impacting skeletal repair and public health.
Area of Science:
- Toxicology
- Orthopedics
- Skeletal Biology
Background:
- Lead (Pb) exposure is a persistent public health issue with long-term bone accumulation.
- Lead affects bone cells and is linked to osteoporosis, but its impact on fracture repair is unknown.
- Bone turnover can mobilize stored lead, increasing blood lead levels.
Purpose of the Study:
- To investigate the effects of lead exposure on skeletal fracture healing.
- To determine if environmentally relevant lead levels impair the bone repair process.
Main Methods:
- Mice (C57/B6) were exposed to lead acetate in drinking water for 6 weeks.
- Closed tibia fractures were surgically induced.
- Radiographic and histologic analyses were performed at 7, 14, and 21 days post-fracture.
Main Results:
- Low lead exposure delayed cartilage formation and maturation during fracture healing.
- High lead exposure led to fibrous nonunions, indicating failed bone repair.
- Lead inhibited ex vivo bone nodule formation but did not affect osteoclast activity.
Conclusions:
- Lead exposure delays fracture healing at environmentally relevant doses.
- High lead doses induce fibrous nonunions by disrupting endochondral ossification.
- Lead's impact on skeletal repair is a critical consideration for public health.