Synthesis and cancer cell cytotoxicity of substituted xanthenes
摘要:
A series of substituted xanthenes was synthesized and screened for activity using DU-145, MCF-7, and HeLa cancer cell growth inhibition assays. The most potent compound, 9g ([N, N-diethyl]-9-hydroxy-9( 3-methoxyphenyl)-9H-xanthene-3-carboxamide), was found to inhibit cancer cell growth with IC50 values ranging from 36 to 50 mu M across all three cancer cell lines. Structure-activity relationship (SAR) data is presented that indicates additional gains in potency may be realized through further derivatization of the compounds (e. g., the incorporation of a 7-fluoro substituent to 9g). Results are also presented that suggest the compounds function through a unique mechanism of action as compared to that of related acridine and xanthone anticancer agents (which have been shown to intercalate into DNA and inhibit topoisomerase II activity). A structural comparison of these compounds suggests the differences in function may be due to the structure of the xanthene heterocycle which adopts a nonplanar conformation about the pyran ring. (C) 2010 Elsevier Ltd. All rights reserved.
转甲状腺素蛋白是一种四聚体蛋白,其功能是作为甲状腺素和视黄醇结合蛋白的转运蛋白。已知转甲状腺素蛋白的错误折叠和淀粉样蛋白聚集会导致野生型和遗传性转甲状腺素蛋白淀粉样变性。通过低分子量化合物稳定转甲状腺素蛋白四聚体是抑制淀粉样变性聚集途径的有效策略。在这里,我们研究了蒽醌和氧杂蒽酮衍生物对淀粉样蛋白聚集的抑制活性,发现具有一个氯或甲基的氧杂蒽酮-2-羧酸具有与二氟尼柳相当的强抑制活性,二氟尼柳是最著名的稳定剂之一。转甲状腺素蛋白。与化合物复合的转甲状腺素蛋白的 X 射线晶体结构表明,引入氯、它被埋在疏水区域中,对于稳定剂对淀粉样变性的强抑制作用很重要。一个体外吸收、分布、代谢和消除 (ADME) 研究和体内药代动力学研究表明,这些化合物具有类似药物的特性,表明它们具有作为稳定转甲状腺素蛋白的治疗剂的潜力。