Synthesis and antitumor activity of novel 20s-camptothecin analogues
作者:Qingyong Li、Hongyan Lv、Yuangang Zu、Zhenhuan Qu、Liping Yao、Lin Su、Chen Liu、Limin Wang
DOI:10.1016/j.bmcl.2008.11.031
日期:2009.1
decrease the toxicity and improve the stability of labile lactone ring of camptothecin, nitrogenous heterocyclic aromatic groups were introduced into 20-position of camptothecin and seventeen new 20s-camptothecin derivatives were obtained in quantitative yield. The cytotoxicity in vitro on three cancer cell lines and the stability of the lactone in phosphate-buffered solution (PBS) of these derivatives
Polyglutamic acid-camptothecin conjugates and methods of preparation
申请人:——
公开号:US20020016285A1
公开(公告)日:2002-02-07
The invention provides polyglutamic acid-therapeutic agent conjugates and methods for their preparation and use.
本发明提供了聚谷氨酸-治疗剂共轭物及其制备和使用方法。
Camptothecin-20-PEG ester transport forms: the effect of spacer groups on antitumor activity
作者:R Greenwald
DOI:10.1016/s0968-0896(98)00005-4
日期:1998.5
An improved synthesis of the hindered PEG-camptothecin diester transport form has been achieved using the Mukaiyama reagent. We have also assessed the effect of changing the electronic configuration of the (d-position of PEG-camptothecin transport forms on the rates of hydrolysis of the pro-moiety, and attempted to correlate these differences to efficacy in two animal models. In addition to the simple substitution of N for O, other synthetic modifications of these atoms were accomplished by employing heterobifunctional linker groups. The half lives by disappearance (rates of hydrolysis) of the transport forms in buffer and rat plasma were determined. It was established that anchimeric assistance to hydrolytic breakdown of the pro-moiety occurs in a predictable manner for some of these compounds. Results for the new derivatives in a P388 murine leukemic model and HT-29 human colorectal xenograft study are also presented. The use of a glycine linker group was found to provide similar efficacy in rodent models to that of simple camptothecin 20-PEG ester, and displayed enhanced pharmacokinetics. (C) 1998 Elsevier Science Ltd. All rights reserved.