In vitro study on increase in radio sensitivity of renal cell carcinoma induced by ?-elemenen / 西安交通大学学报(医学版)

ABSTRACT

Objective To study the effect and mechanism of increase in radio sensitivity of kidney cancer cells(GRC-1) induced by ?-elemenen in vitro. Methods GRC-1 cells were divided into 3 groups, blank group (added with 2 mL culture medium), emulsion group (added with 2 mL blank emulsion culture medium) and drug group (added with 2 mL 50 mg?L -1 ?-elemenen culture medium). After been cultivated for 24 hours, the cells were irradiated using 6MeV X-linear accelerator in different doses at the rate of 400cGy per minute. Number of cell clones was counted, and radiation-survival curve of GRC-1 cells was drawn. Flow cytometry (FCM) was used to measure cell cycle and apoptosis. Cells of climbing flake were dyed by immunocytochemical method, the gene expression of bcl-2 and PCNA was measured by imaging system. Results The cell cycle showed that the G 2M blocking caused by 50 mg?L -1 ?-elemenen was enhanced with time increase. It reached peak at 24 hours. FCM showed that the level of apoptosis increased with increase in drug dose and action time. The gene expression of bcl-2 was decreased by 20% in drug group than that in blank group, but there was no expression of PCNA in the two groups. Conclusion The radiosensitivity of GRC-1 cells can be enhanced by ?-elemenen. The mechanism of effect may be associated with the cell cycle blocking, inducing cell apoptosis and down-regulating expression of bcl-2 gene.