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HSP27 MODULATION OF IMPLANT- ASSOCIATED METAL ION CYTOTOXICITY OF OSTEOBLASTIC CELLS  

Yoon, Jung-Ho (Department of Oral and Maxillofacial Surgery, College of Medicine, Korea University)
Ha, Dong-Jin (Department of Oral and Maxillofacial Surgery, College of Medicine, Korea University)
Rim, Jae-Suk (Department of Oral and Maxillofacial Surgery, College of Medicine, Korea University)
Kwon, Jong-Jin (Department of Oral and Maxillofacial Surgery, College of Medicine, Korea University)
Jang, Hyon-Seok (Department of Oral and Maxillofacial Surgery, College of Medicine, Korea University)
Lee, Eui-Seok (Department of Oral and Maxillofacial Surgery, College of Medicine, Korea University)
Kim, Dae-Sung (Department of Oral and Maxillofacial Surgery, College of Medicine, Korea University)
Publication Information
Maxillofacial Plastic and Reconstructive Surgery / v.28, no.2, 2006 , pp. 127-135 More about this Journal
Abstract
Objectives: The extent of bone formation that occurs at the interface of metallic implants and bone is determined by the number and activity of osteoblastic cells. Stress proteins may be contributing determinants of cell viability in altered environments. Hsp27 is a small Mr hsp which is known as a molecular chaperone. Methods: To better understand how heat shock protein 27 contributes to endosseous implant - associated metal ions affects on osteoblastic cell viability, the effect of chromium and titanium ions were compared to effects of cadmium ions in the ROS17/2.8 osteoblastic cell line. Results: ROS17/2.8 osteoblastic cell line demonstrated ion - specific reductions in growth; reductions were significantly greater for cadmium than for chromium or titanium. Chromium impaired growth of cultures without altering cell viability measured using the MTT assay. A stable transformed cell line expressing additional hsp27(clone "A7") was resistant to the toxic effects of titanium and partially protected from cadmium toxicity. Conclusions: A role for hsp27 in protection of osteoblastic cells from metal ion toxicity is supported by the chromium - induced elevations in hsp27 abundance and the behavior of the A7 cell line in response to metal ions in culture. Similar biochemical responses to altered cellular environments may contribute to the fate of tissues adjacent to select metallic implants.
Keywords
Metallic implants; Heat shock protein 27; Chromium; Titanium; Cadmium;
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