抄録
The influence of a semiconductor laser on the cell cycle of K-562 cells was investigated by flow cytometry. After semiconductor laser irradiation for 15s at a power of 500mW, the percentage of cells in the G2/M phase was increased to 31.4±1.63 (mean±SEM)% as compared with 18.5±1.26% for the untreated cells (p<0.01). Irradiation for 2 min at 100, 250, or 500mW, or for 15s at 100mW, however, did not significantly affect the cell cycle. The temperature change upon irradiation of 100-500mW, with laser light for 15s or 2min was marignal, ranging from 0.2 to 1.1°C, and no morphological change in the cells was observed after the irradiation. Based on these results, we assume that semiconductor laser irradiation under restricted conditions can activate cells in terms of their cell cycle activity by its non-thermal action
