硒鉑配位組裝體:通過活性氧選擇性殺死癌細(xì)胞
[Abstract]:With the rapid development of science and technology, cancer is still the biggest killer threatening human health. It is very important to develop new anticancer drugs. Among them, the most important thing is to improve the selectivity of drugs. Scientists try to use drug carriers to transport drugs, including polymer micelles, polymer vesicles, nanoparticles, and so on, using the enhanced osmotic retention of tumor tissues for targeted transport. However, because of the instability in the blood circulation and the complex microenvironment near tumor tissue, carrier transport failed to achieve the goal of keeping the anticancer activity of the drug while reducing the side effects. In addition, scientists are trying to redevelop existing derivatives of anticancer drugs in the hope of better selectivity and better efficacy. However, because of the lack of innovation in anticancer mechanism, the derivatives based on existing anticancer drugs can not improve their selectivity even though they have a certain increase in killing power compared with the original drugs. Selenium, as a necessary trace element, has unique redox characteristics and plays an important role in regulating redox balance in human body. Studies have shown that selenium plays an important role in preventing cancer. Selenium can inhibit the formation of reactive oxygen group at low concentration and induce the production of active oxygen group at high concentration. The combination of selenium and metal anticancer drugs is expected to provide a new way to enhance drug selectivity. In this paper, we synthesized three-arm selenium-containing amphiphilic molecules. This selenium-containing molecule exhibits selectivity to cancer cells but lacks sufficient lethality. Therefore, we coordinate this molecule with cisplatin in the hope of improving its cytotoxicity while retaining its selectivity. The results show that the selenium molecule can coordinate with platinum and form a 1:1 ligand structure. By inducing cancer cells to produce excess reactive oxygen species, ligands can effectively kill a variety of cancer cells. At the same time, the toxicity of the ligands to normal cells was greatly reduced because of the low concentration of reactive oxygen species produced by the ligands in normal cells. Because the ligand kills cancer cells by a different mechanism than cisplatin, it overcomes the resistance of cancer cells to cisplatin. In cancer cell lines with strong resistance to cisplatin, the ligands are much more lethal than cisplatin. The coordination of selenium molecule and cisplatin improves the selectivity of cancer cells, and it also shows different anticancer mechanism from cisplatin and overcomes drug resistance. We hope that selenium-containing small molecules can be used more widely in anti-tumor. It can be applied not only to other platinum antitumor drugs but also to the improvement of ruthenium titanium germanium and other metal series anticancer drugs. The coordination of selenium and other metals provides a cheap and efficient way to achieve selective anticancer, which will bring new vitality to traditional metal anticancer drugs.
【學(xué)位授予單位】:清華大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:R914;O641.4
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