Design, Synthesis, and Biological Evaluation of New Cathepsin B-Sensitive Camptothecin Nanoparticles Equipped with a Novel Multifuctional Linker
作者:Xuan Zhang、Kaiyong Tang、Hong Wang、Yaqian Liu、Bin Bao、Yanfen Fang、Xiongwen Zhang、Wei Lu
DOI:10.1021/acs.bioconjchem.6b00099
日期:2016.5.18
Traditional antitumor drugs such as camptothecin and paclitaxel derivatives are widely used in cancer chemotherapy. However, the major defects of those agents include severe toxicity and poor water solubility. With these in mind, a novel multifunctional linker was designed and two Cathepsin B (CTB) sensitive CPT conjugates (9a and 9b) were synthesized. Through click chemistry, additional functional group mPEG2000 can be easily introduced into these conjugates. The introduction of mPEG2000 fragment resulted in the formation of nanoparticles 1a and 1b (average particle sizes were 216.9 and 257.9 nm, respectively) with significantly increased water solubility (more than 19 000-fold). The release of therapeutic drug SN-38 in the presence of CTB was confirmed by HPLC and prodrug 1a showed potent in vitro cytotoxicity against all tested cell lines. Impressively, compared with irinotecan, CTB sensitive prodrug 1a displayed similar in vivo efficacy with remarkable decreased in vivo toxicity.
Selective turn-on near-infrared fluorescence probe for hypoxic tumor cell imaging
作者:Chen Jin、Qiumeng Zhang、Wei Lu
DOI:10.1039/c7ra01466j
日期:——
In this study, we designed a new selective turn on near-infrared fluorescence probe by conjugating (1-methyl-2-nitro-1H-imidazol-5-yl)methanol to DCPO with ether linkage for hypoxic tumor cell imaging.
Synthesis and biological evaluation of hypoxia-activated prodrugs of SN-38
作者:Chen Jin、Qiumeng Zhang、Wei Lu
DOI:10.1016/j.ejmech.2017.03.040
日期:2017.5
We designed new hypoxia-activated prodrugs by conjugating (1-methyl-2-nitro-1H-imidazol-5-yl)methanol with 7-ethyl-10-hydroxy camptothecin (SN-38). Initially, we improved the method of multi-gram scale synthesis of (1-methyl-2-nitro-1H-imidazol-5-yl)methanol, which increased the yield to 42% compared to 8% by the original synthesis method. The improved method was used to synthesize evofosfamide (TH-302)