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Effect of indomethacin on induction of apoptosis in colonic cancer cell line SW480 transferred by wild-type p53 gene
Gui-Ying Zhang, Mei-Hua Xu, Zhao-Xia Xie, Chun-Mei He
Gui-Ying Zhang, Mei-Hua Xu, Zhao-Xia Xie, Department of Gastroenterology, Xiangya Hospital, Zhongnan University, Changsha 410008, Hunan Province, China
Chun-Mei He, Cancer Research Institute, Xiangya Medical College, Zhongnan University, Changsha 410078, Hunan Province, China
Supported by: the Natural Science Foundation of the Ministry of Health of China, No. 98-2-088.
Corresponding author: Gui-Ying Zhang, Department of Gastroenterology, Xiangya Hospital, Zhongnan University , 141 Xiangya Road, Changsha 410008, Hunan Province, China. meihuaxu2001@yahoo.com.cn
Received: October 18, 2002 Revised: March 20, 2003 Accepted: May 21, 2003 Published online: November 15, 2003
AIM
To investigate the anti-tumor effect of indomethacin on colon cancer.
METHODS
SW480 cells were transferred by wtp53 gene, treated with different concentrations of indomethacin. Apoptosis was analyzed by acridine orange and ethidium bromide staining, and electron microscopy. Expressions of Bcl-2, Bax and p21WAF1/CIPI protein were detected by Western blotting.
RESULTS
Indomethacin induced apoptosis in wtp53/SW480 cells. Typical cell morphological changes included cytoplasm and nuclear shrinkage, nuclear fragmentation and formation of apoptotic bodies. The count of apoptotic cells was dose and time-dependent, and the apoptotic cells accounted for 5.0±2.0% in SW480 cells, 60.1±2.0% in wtp53/SW480 cells treated with 600 μmol/L indomethacin for 72 h (P<0.01), with a significant difference between the two groups. The expression of Bcl-2 protein of wtp53/SW480 cells was down-regulated by indomethacin in a dose dependent manner. The expression of Bax protein did not change, and the expressions of Bcl-2 and Bax protein of SW480 cells did not change either. The expression of p21WAF1/CIPI protein of wtp53/SW480 cells was up-regulated, reaching the maximal level at the concentration of 400 μmol/L indomethacin and returning to control level at the concentration of 600 μmol/L indomethacin
CONCLUSION
Indomethacin could induce apoptosis in wtp53/SW480 cells by down-regulating the expression of Bcl-2 protein and up-regulating the expression of p21WAF1/CIPI protein, but no change in Bax protein.
Key Words: N/A
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