DNA修復(fù)蛋白XPF影響腎癌細胞順鉑耐藥的作用與機制研究
[Abstract]:Statistics from the Ministry of Health show that the incidence of renal cell carcinoma in China ranks among the top ten male malignant tumors and is on the rise year by year.Among the tumors of the urogenital system, the incidence of renal cell carcinoma is second only to that of bladder cancer.The treatment of early or middle stage renal cell carcinoma is the same as that of other tumors, and surgical treatment is the main treatment.The treatment of advanced renal cell carcinoma is obvious. Different from other tumors, renal cell carcinoma is generally resistant to cisplatin and other traditional chemotherapy drugs, so the treatment of advanced renal cell carcinoma can not be as chemotherapy-based as other tumors, only immunotherapy and targeted therapy, which makes the treatment of advanced renal cell carcinoma poor.
Unlike renal cell carcinoma, testicular cancer is very effective in chemotherapy. The cure rate of testicular cancer can reach more than 90% with cisplatin-based chemotherapy. The high sensitivity of testicular cancer to cisplatin is closely related to the low expression of DNA repair protein XPF. XPF is an important DNA repair protein, mainly involved in nucleotide excision repair pathway. XPF table Low expression of XPF in testicular cancer is highly susceptible to cisplatin, suggesting that resistance to chemotherapy drugs such as cisplatin in renal cancer may be associated with a higher level of XPF expression. The expression level of XPF in renal cell carcinoma can enhance the sensitivity of cisplatin and make cisplatin possible for the treatment of renal cell carcinoma.
The expression of XPF was detected by immunohistochemical staining in cancer tissues and adjacent tissues. It was found that the expression of XPF was the highest in renal carcinoma, followed by bladder cancer and testicular cancer, and the highest in adjacent tissues, followed by bladder cancer and testicular cancer. The expression of XPF in renal cell carcinoma and bladder cancer cells was higher than that in bladder cancer cells. The cisplatin sensitivity of renal cell carcinoma cells was lower than that of bladder cancer cells by clone formation assay. The sensitivity of ACHN-shXPF cell line to cisplatin was significantly increased. The sensitivity of ACHN-shXPF cells to cisplatin in vivo was detected by subcutaneous transplantation tumor model in nude mice. Cell cycle arrest and cisplatin-induced apoptosis were detected. The results showed that the DNA repair ability of ACHN-shXPF cells decreased, the cell cycle arrest induced by cisplatin was abnormal, and the apoptosis induced by cisplatin was increased.
In conclusion, the higher the expression level of XPF in tumor tissue and tumor cells, the lower the sensitivity to cisplatin, that is, the negative correlation between the expression level of XPF and the sensitivity to cisplatin. Molecular mechanisms include decreased DNA repair, abnormal cell cycle arrest induced by cisplatin, and increased apoptosis induced by cisplatin. Increasing the proportion of senescent cells may also be one of the mechanisms responsible for the increased sensitivity to cisplatin. This study suggests that interfering with the expression of XPF in renal cancer cells by designing small molecule drugs may enhance the sensitivity to cisplatin. Platinum is successfully applied to the treatment of renal cell carcinoma.
【學位授予單位】:第三軍醫(yī)大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:R737.11
【共引文獻】
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