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Preferential degradation of osteoclasts by titanium tetrachloride
T Matsunaga1, T Kojo, T Tsujisawa
1Second Department of Prothetic Dentistry, Kyushu Dental College, 2-6-1 Manazuru, Kokurakita-Ku, Kitakyushu, Fukuoka 803-8580, Japan.
Journal of Biomedical Materials Research
|March 20, 2001
Summary
Titanium tetrachloride preferentially degrades osteoclasts, key bone-resorbing cells, through apoptosis. This study reveals titanium
Area of Science:
- Biomaterials Science
- Cell Biology
- Orthopedics
Background:
- Titanium alloys are widely used in orthopedic implants due to their biocompatibility.
- The specific effects of titanium ions on osteoclast function, crucial for bone remodeling, are not fully understood.
Purpose of the Study:
- To investigate the impact of titanium tetrachloride on osteoclast formation, survival, and function.
- To compare the effects of titanium tetrachloride on osteoclasts versus osteoblasts.
Main Methods:
- Osteoclast-like cells were induced from mouse bone marrow cultures.
- Disaggregated osteoclasts from neonatal rats were treated with titanium tetrachloride.
- Osteoblastic cell cultures from rat calvaria were assessed for cell number and alkaline phosphatase activity.
Main Results:
- Titanium tetrachloride (10 microM) reduced osteoclast-like cell formation and induced degradation of mature osteoclasts.
- Titanium tetrachloride treatment led to increased osteoclast apoptosis and decreased bone resorption.
- Osteoblastic cells showed reduced cell number and alkaline phosphatase activity at 30-40 times higher titanium tetrachloride concentrations.
Conclusions:
- Titanium ions induce preferential degradation of osteoclasts over osteoblasts, primarily via apoptosis.
- This selective effect on osteoclasts may have implications for understanding bone remodeling around titanium implants.