Abstract
Bisphosphonates (BP) are used in the treatment of malignant osteolytic processes and postmenopausal osteoporosis. There have been a number of incidents in patients treated with BP. The incidents are described as an osteonecrosis of the jaw (ONJ). The main medications associated with these reports are zoledronic acid (ZOL) and pamidronate (PAM). The clinical presentations describe a deterioration of the jaw bones and surrounding tissues. The purpose of this study was to investigate expression of collagen types I, II, III, and V in human gingival fibroblasts, osteoblasts, and osteosarcoma cells (SaOS-2 cells) by ELISA and reverse transcription PCR (RT-PCR) with constant exposure (28 days) to ZOL and PAM. The real-time PCR indicates that ZOL inhibited gene expression below 16% at any concentration used. Hence, an amplification of extracellular matrix was only possible for PAM at concentrations of 1 µM. The following expression levels were for fibroblasts at a maximum of 31%, exceptionally high for the osteoblasts at 56%, and for SaOS-2 cells the peak was 14%. Principally, a decreased production of collagen was measured. With this in vitro study, we demonstrated how negatively influencing a long exposure to ZOL and PAM can be. Therefore, a reduction in extracellular matrix production of these cell lines under BP exposure could be a possible clinical indication as to why patients experience ONJ and have wound healing problems. However, it remains uncertain as to why an osteonecrosis is mainly found in the jaws and not other bones. As there are many influencing factors, further investigation needs to be pursued.
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Acknowledgements
The authors thank Mrs. Gisela Otto for her excellent technical assistance. We are grateful to Novartis, who provided Zometa® and Aredia® for this study. We also like to thank Judy Henry and Andrew Cerexhe for reviewing this manuscript.
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The authors declare that they have no conflict of interest.
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Simon, M.J.K., Niehoff, P., Kimmig, B. et al. Expression profile and synthesis of different collagen types I, II, III, and V of human gingival fibroblasts, osteoblasts, and SaOS-2 cells after bisphosphonate treatment. Clin Oral Invest 14, 51–58 (2010). https://doi.org/10.1007/s00784-009-0312-2
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DOI: https://doi.org/10.1007/s00784-009-0312-2