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Dauricine is a plant metabolite, chemically classified as a phenol, an aromatic ether, and an isoquinoline alkaloid.〔(【引用サイトリンク】url=http://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:4331 )〕 It has been isolated from the Asian vine Menispermum ''dauricum'', commonly known as Asian moonseed, and the North American vine Menispermum ''canadense'', commonly known as Canadian moonseed. Scientists Tetsuji Kametani and Keiichiro Fukumoto of Japan are credited with being the first to synthesize dauricine in 1964, using both the Arndt-Eistert reaction and Bischler-Napieralski reaction to do so. Dauricine has been show to play a variety of biological roles in the human body, from inhibiting cancer cell growth to blocking cardiac transmembrane Na+, K+, and Ca2+ ion currents. == Dauricine and Cancer == Dauricine and Colon Cancer: Dauricine has been shown to have anti-tumor effects in colon cancer. There is evidence to suggest that dauricine suppresses colon cancer cell growth and invasion in a dose-dependent manner. Dauricine has also been shown to induce apoptosis in colon cancer cells by facilitating the cleavage of caspase3 and poly ADP ribose polymerase (PARP). Furthermore, it is thought that dauricine suppresses tumor necrosis factor-induced (TNF-induced) nuclear factor-kappa B (NF-κB) activation by inhibiting the p65 nuclear translocation in colon cancer cells. Together, these discoveries help scientists better understand the link between dauricine and the suppression of colon cancer tumor cells. Dauricine and Lung Cancer: Dauricine has been shown to cause cytotoxicity in human lung cell lines, including BEAS-2B, WI-38, and A5449, which have been implicated in lung bronchus, lung fibroblast, and lung cancer, respectively. One study found that after 24 hour exposure to 40 µM dauricine, there was more than 60% cell death in the aforementioned human lung cell lines. Moreover, CYP3A, a class of human recombinant P450 enzymes, have been found to activate dauricine in human lung cells, resulting in the formation of quinone methide metabolite whose role in lung cytotoxicity needs to be further studied. Overall, dauricine-induced cytotoxicity in human lung cells raises concerns about the use of dauricine and its analogues in pharmaceuticals. Dauricine and Breast Cancer: Dauricine has been shown to inhibit human breast cancer angiogenesis. Dauricine inhibits insulin-like growth factor-I-induced (IGF-I-induced) hypoxia-inducible factor I-alpha (HIF-Iα) protein accumulation and vascular endothelial growth factor (VEGF) protein secretion in MCF-7, human breast cancer cells. It is thought that dauricine inhibits IGF-1-induced HIF-1α protein accumulation and VEGF protein secretion by blocking the activation of the PI-3K/AKT/mTOR signaling pathway. Both HIF-1α and VEGF play an important role in human breast cancer angiogenesis. Thus, dauricine’s inhibitory effect on these molecules is a promising point of study for human breast cancer treatment. Dauricine and Urinary Cancer: Dauricine has been shown to have anti-tumor effects in various urinary cancers, including bladder cancer and prostate cancer. It has been found that dauricine has a minimum drug sensitivity concentration between 3.81-5.15 µg/mL in bladder cancer EJ cells and prostate cancer PC-3M cells. In addition, there is evidence to suggest that cytotoxicity in urinary cancer cells depends upon drug concentration. The exact anti-tumor mechanism present in these urinary cancer cells has yet to be determined. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dauricine」の詳細全文を読む スポンサード リンク
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