Study on Hyper-radiosensitivity Effect of Human Hepatoma SMMC-7721 Cells Exposed to Low Dose γ-rays
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Abstract
The low-dose responses such as hypersensitivity and increased radio-resistance of human hepatoma SMMC-7721 cells were studied in this work. Exponentially growing SMMC-7721 cells were irradiated with ~(60)Co γ-rays at doses of 0—6 Gy. Together with flow cytometer for precise cell sorting, cell survival fractions were measured by means of conventional colony-formation assay. It has been found that the SMMC-7721 cells showed hyper-radiosensitivity response at low doses and increased radio-resistance at larger
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