Abstract (eng)
The use of bone replacement materials to support fracture healing is on the rise. Because the healing process is dependent on the interaction between osteoclast and osteoblast, it appears necessary to study the behaviour of these cells on the applied biomaterial.
In this thesis, the apoptosis and necrosis behaviour of osteoblasts and osteoclasts was examined on different biomaterials β-TCP and Elastin-like polymer (ELP) and compared with glass. Therefore isolated osteoclasts were exposed to the various biomaterials, stained after 24 and 48 hours, with Annexin V and Propidium iodid (PJ) and analysed using a fluorescence microscope. To better estimate apoptosis / necrosis, groups were compared with Doxorubicin. With the same experimental set-up, osteoblasts from a murine cell line were examined only after 72 hours.
This study provides further evidence that osteoblasts are apoptosis-sensitive cells. It was difficult to find cells that showed either apoptosis or necrosis. Most of the cells showed necrosis. In comparison to the osteoclasts, osteoblasts showed greater capability of resistance against biomaterials. Osteoblasts on glass showed the lowest values of apoptosis and necrosis, ELP showed very different results between the individual experiments. β-TCP revealed completely unexpected results: all cells showed a complete PJ staining from the beginning, which indicated necrosis. Unfortunately, Annexin V and PJ as the only apoptosis and necrosis markers were not enough, to get a complete picture of necrosis and apoptosis of osteoblast and osteoclast on different biomaterials.