Luminescent magnetic hollow mesoporous silica nanotheranostics for camptothecin delivery and multimodal imaging
作者:Swagatika Sahu、Niharika Sinha、Sujit K. Bhutia、Megharay Majhi、Sasmita Mohapatra
DOI:10.1039/c3tb21669a
日期:——
The synthesis of a novel and specific nanoplatform for anticancer drug delivery, fluorescence imaging and contrast agent in magnetic resonance imaging has been described.
Perfluoroalkyl group-containing micelle-forming triiodoaromatic compounds, process for their production and their use as contrast media
申请人:Schering AG
公开号:US20030236407A1
公开(公告)日:2003-12-25
The invention relates to new, perfluoroalkyl group-containing triiodoaromatic compounds, process for their production, their use as contrast media for x-ray diagnosis as well as for magnetic resonance diagnosis and magnetic resonance spectroscopy by means of fluorine measurement. Subjects of the invention are also diagnostic agents that contain these new compounds.
Provided herein are dendrimers comprising: a core unit, five generations of building units which are lysine residues or analogues thereof, first terminal groups comprising a residue of a camptothecin active covalently attached to a diglycolyl linker group, and second terminal groups comprising a PEG group. Also provided herein are pharmaceutical compositions comprising the dendrimer, and methods and uses of the dendrimers in therapy of disorders such as cancers. Processes for making the dendrimers and intermediates are also provided.
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.