potent cytotoxic agent than the parent compound α-hederagenin (H), 24 α-hederagenin derivatives (5–8, 11–24, 27–28, 31–32, and 35–36) were synthesized in a concise and efficient strategy and screened for in vitro cytotoxicity against the human cancer cell lines MKN45 and KB. Among these compounds, the polyamine derivative 15 exhibited more potency than the parent compound with IC50 values in the range
Design, synthesis, nitric oxide release and antibacterial evaluation of novel nitrated ocotillol-type derivatives
作者:Yi Bi、Xiao Yang、Tingting Zhang、Zeyun Liu、Xiaochen Zhang、Jing Lu、Keguang Cheng、Jinyi Xu、Hongbo Wang、Guangyao Lv、Peter John Lewis、Qingguo Meng、Cong Ma
DOI:10.1016/j.ejmech.2015.06.021
日期:2015.8
Nitric oxide (NO) and its auto-oxidation products are known to disrupt normal bacterial function and NO releasing molecules have the potential to be developed as antibacterial leads in drug discovery. We have designed and synthesized a series of novel nitrated compounds by combining NO releasing groups with ocotillol-type triterpenoids, which have previously demonstrated activity only against Gram-positive bacteria. The in vitro NO release capacity and antibacterial activity were sequentially evaluated and the data showed that most of the synthesized compounds could release nitric oxide. Compound 16a, 17a and 17c, with nitrated aliphatic esters at C-3 position, displayed higher NO release than other analogues, correlating to their good antibacterial activity, in which 17c demonstrated broad-spectrum activity against both Gram positive and -negative bacteria, as well as excellent synergism at sub-minimum inhibitory concentration when using with kanamycin and chloramphenicol. Furthermore, the epifluorescent microscopic study indicated that the ocotillol-type triterpenoid core may induce NO release on the bacterial membrane. Our results demonstrate that nitrated substitutions at C-3 of ocotillol-type derivatives could provide an approach to expand their antibacterial spectrum, and that ocotillol-type triterpenoids may also be developed as appropriate carriers for NO donors in antibacterial agent discovery with low cytotoxicity. (C) 2015 Elsevier Masson SAS. All rights reserved.
Iodination of verapamil for a stronger induction of death, through GSH efflux, of cancer cells overexpressing MRP1
作者:Régis Barattin、Thomas Perrotton、Doriane Trompier、Doriane Lorendeau、Attilio Di Pietro、Amaury du Moulinet d’Hardemare、Hélène Baubichon-Cortay
DOI:10.1016/j.bmc.2010.07.031
日期:2010.9
The multidrug resistance protein 1 (MRP1), involved in multidrug resistance (MDR) of cancer cells, was found to be modulated by verapamil, through stimulation of GSH transport, leading to apoptosis of MRP1-overexpressing cells. In this study, various iodinated derivatives of verapamil were synthesized, including iodination on the B ring, known to be involved in verapamil cardiotoxicity, and assayed for the stimulation of GSH efflux by MRP1. The iodination, for nearly all compounds, led to a higher stimulation of GSH efflux. However, determination of concomitant cytotoxicity is also important for selecting the best compound, which was found to be 10-fold more potent than verapamil. This will then allow us to design original anti-cancer compounds which could specifically kill the resistant cancer cells. (C) 2010 Published by Elsevier Ltd.
Discovery and synthesis of 3- and 21-substituted fusidic acid derivatives as reversal agents of P-glycoprotein-mediated multidrug resistance
作者:Mengqi Guo、Qianwen Ren、Binghua Wang、Wentao Ji、Jingxuan Ni、Yaqi Feng、Yi Bi、Jingwei Tian、Hongbo Wang
DOI:10.1016/j.ejmech.2019.111668
日期:2019.11
In this study, we synthesized 23 fusidic acid (FA) derivatives and screened them for tumor drugresistancereversal activity and cytotoxicity toward the KBV (multidrug-resistant oral epidermoid carcinoma) cell line based on MTT assay. Tumor resistancereversal activity of fusidic acid (FA) derivatives was discovered for the first time. Our results showed that compound 1 enhanced the cytotoxicity of