Enhanced sensitivity to mitomycin C by abating heat shock protein 70 expression in human bladder cancer cell line of BIU-87

• Published in: Chinese medical journal Vol. 118; no. 23; pp. 1965 - 1972
• Main Authors: He, Ling-feng, Guan, Kao-peng, Yan, Zheng, Ye, Hai-yun, Xu, Ke-xin, Ren, Liang, Hou, Shu-kun
• Format: Journal Article
• Language: English
• Published: China Department of Urology, Peking University People's Hospital, Beijing 100044, China%Department of Urology, Cancer Hospital and Institute, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100021, China%Central Laboratory, Peking University People's Hospital, Beijing 100044, China 05.12.2005
• Subjects: Apoptosis - drug effects; BIU-87; Cell Line, Tumor; Gene Expression Regulation, Neoplastic - drug effects; HSP70 Heat-Shock Proteins - antagonists & inhibitors; HSP70 Heat-Shock Proteins - genetics; HSP70 Heat-Shock Proteins - physiology; Humans; Mitomycin - pharmacology; Oligodeoxyribonucleotides, Antisense - pharmacology; RNA, Messenger - analysis; Urinary Bladder Neoplasms - drug therapy; Urinary Bladder Neoplasms - metabolism; Urinary Bladder Neoplasms - pathology; 丝裂霉素C; 基因表达; 抗生素; 热休克蛋白70; 膀胱肿瘤; heat shock protein 70; apoptosis; mitomycin C; antisense oligomers; bladder cancer
• ISSN: 0366-6999; 2542-5641

Background Bladder cancer is a relatively common tumor in the urinary system, in which mitomycin C （MMC）-based chemotherapy or combination chemotherapy has been mainly used to treat patients with advanced bladder cancer. The prognosis of patients with advanced bladder cancer is still extremely poor in spite of recent therapeutic advances. To improve the prognosis, the sensitivity of tumor cells to mitomycin C by the induction of apoptosis with the abating heat shock protein 70 （HSP70） expression in human bladder cancer cell lines of BIU-87 was investigated. Methods I-ISPT0 expression was abated in BIU-87 cells by HSV mI~NA anhsense ongomers, lnl i assay at,u the clone-forming test were used for evaluating the sensitivity of cells to MMC. Apoptosis was assessed using both fluorescent microscopy after staining the cells with Hoechst 33258 and DNA fragment ladder agarose electrophoresis. Thirty-two male six-week-old BALB/c nude mice, at the beginning of the experiment, were used to evaluate the effect of antisense oligomers （ASO） on the tumor formation in vivo. Results HSP70 expression in BIU-87 was effectively abated by HSP70 mRNA antisense oligomers. The percentage of apoptotic cells in ASO group was greater than in sense oligomers （SO） [P 〈0. 05, （18.31 ±2. 89）% vs （1.89±0.74）%], nonsense oligomers （NO） [P 〈0.05, （18.31±2.89）% vs （1.78±0.92）%] and blank groups [P〈0.05, （18.31 ±2.89）% vs （1.87±0.84）%], while the sensitivity of tumor cells to mitomycin C was enhanced. The in vivo tumor inhibition rate of ASO plus MMC （ 〉 50% ） was more than that of ASO or MMC group alone （ all P 〈 0. 05 ）. Conclusions The abating level of HSP70 expression can strengthen the sensitivity of BIU-87 to MMC. One of this effect might be related to the induction of apoptosis by abating HSP70 expression.