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The aim of this research was to find out whether the passage number effect may influence on the PC-3 cells (the human prostate cancer line derived from bone metastases) response to proton radiation. 2 MeV horizontally focused proton microbeam was used as a radiation source. The cells were treated with a counted number of H(+) ions (50-8000) corresponding to doses of 1.3-209 Gy/cell. For comparison, cell death was also induced by UVC radiation. All cells were stained with Hoechst 33342 and propidium iodide and visualized under a fluorescence microscope. Necrosis was observed at: a) 8000 protons per cell (corresponding to ∼209 Gy/cell) after 2-4 passages, b) 3200 protons per cell (corresponding to ∼84 Gy/cell) for cells after 11-14 passages and c) only 800 protons per cell (corresponding to ∼2 Gy/cell ) after 47-50 passages. Apoptosis was efficiently induced, by protons, only in cells after 50 passages. The results showed that the laboratory conditions affected cellular response of PC-3 cell line to the proton irradiation. The cellular response to the radiation treatment strongly depends on number of passages.

Changes in cellular response to the damage induced in PC-3 prostate cancer cells by proton microbeam irradiation