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자료유형
학술저널
저자정보
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제38권 제3호
발행연도
2006.1
수록면
325 - 331 (7page)

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SC-560, a strucutral analogue of celecoxib, induces growth inhibition in a wide range of human cancer cells in a cyclooxygenase (COX)-independent man-ner. Since SC-560 suppresses the growth of cancer cells mainly by inducing cell cycle arrest, we sought to examine the role of p21CIP1, a cell cycle regulator protein, in the cellular response against SC-560 by using p21+/+ and p21-/- isogenic HCT116 colon car-cinoma cells. In HCT116 (p21+/+) cells, SC-560 dose-dependently induced growth inhibition and cell cycle arrest at the G1 phase without significant apoptosis induction. SC-560-induced cell cycle arrest was accompanied by upregulation of p21CIP1. However, the extent of SC-560-induced accumula-tion at the G1 phase was approximately equal in the p21+/+ and the p21-/- cells. Nonetheless, the growth inhibition by SC-560 was increased in p21-/- cells than p21+/+cells. SC-560-induced reactive oxygen species (ROS) generation did not differ between p21+/+and p21-/- cells but the subsequent activaton of apoptotic caspase cascade was more pronounced in p21-/- cells compared with p21+/+ cells. These results suggest that p21CIP1 blocks the SC-560-induced apoptotic response of HCT116 cells. SC-560 combined with other therapy that can block p21 CIP1 expression or function may contribute to the effective treatment of colon cancer.

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