pH-responsive polymeric carrier encapsulated magnetic nanoparticles for cancer targeted imaging and delivery
作者:Dongyun Chen、Xuewei Xia、Hongwei Gu、Qingfeng Xu、Jianfeng Ge、Yonggang Li、Najun Li、Jianmei Lu
DOI:10.1039/c1jm11195g
日期:——
Multifunctional drug delivery systems with favorable compatibility, high selectivity and efficiency are appropriate candidates for future medical applications. For this purpose, a multifunctional nanocomposite that enables selective magnetic resonance imaging and anticancer therapy by encapsulating hydrophobic superparamagnetic nanoparticles and chemotherapeutic agent doxorubicin with a novel biodegradable pH-activated polymeric carrier was synthesized. The as-synthesized amphiphilic polymer has excellent biocompatibility and pH-responsivity. The obtained nanocomposites selectively release the encapsulated drug and magnetic nanoparticles in mildly acidic endosomal/lysosomal compartments due to the degradation of the pH-responsive bonds, resulting in a change of imaging signal and cancer therapy. Furthermore, when compared with the nanocomposites without a targeting moiety, as studied from over-expression of the folic acid receptor tumor cell culturing, the conjugates with folic acid showed a significantly more potent targeting capability.
A novel degradable polymeric carrier for selective release and imaging of magnetic nanoparticles
作者:Dongyun Chen、Najun Li、Hongwei Gu、Xuewei Xia、Qingfeng Xu、Jianfeng Ge、Jianmei Lu、Yonggang Li
DOI:10.1039/c0cc01857k
日期:——
A water-soluble, pH-responsive copolymer was synthesized successfully and used as a polymeric carrier to deliver hydrophobic paramagnetic nanoparticles into cells. In an acidic environment, the nanoparticles aggregate as the copolymer degrades, resulting in the enhancement of an in vitro MRI signal.
A facile preparation of targetable pH-sensitive polymeric nanocarriers with encapsulated magnetic nanoparticles for controlled drug release
作者:Shun Yang、Dongyun Chen、Najun Li、Xiao Mei、Xiuxiu Qi、Hua Li、Qingfeng Xu、Jianmei Lu
DOI:10.1039/c2jm34817a
日期:——
Novel multifunctional nanocomposites were successfully prepared for the controlled release of anti-cancer drug and magnetic resonance imaging (MRI) via a simple self-assembly process. In this strategy, superparamagnetic iron oxide nanoparticles (SPIONPs) were “fixed” between the hydrophobic segment of the pH-sensitive amphiphilic polymer (HAMAFA-b-DBAM) and the surface of hollow mesoporous silica nanoparticles (HMS) which were modified by the long-chain hydrocarbon octadecyltrimethoxysilane (C18). Since the amphiphilic polymer was conjugated with a folic acid (FA) group, the nanocomposites could target the folic acid receptor (FR) of over-expressed tumor cells efficiently. Moreover, high drug loading content was obtained simultaneously due to the hollow core of HMS. The loaded drug could release from the HMS core triggered by the mildly acidic pH environment in the cancer cells due to the hydrolysis of the pH-sensitive polymer shell. The targeting process of the nanocomposites could be easily tracked by MRI due to the magnetism of the SPIONPs. Therefore, a nanocarrier with high drug-loading capacity and controlled drug release property for tumor diagnosis and therapy was obtained via the self-assembly of HMS core, magnetic Fe3O4 nanoparticles and targetable pH-sensitive polymer shell.
通过简单的自组装过程,成功制备了新型多功能纳米复合材料,用于抗癌药物的控制释放和磁共振成像(MRI)。在这一策略中,超顺磁性氧化铁纳米粒子(SPIONPs)被 "固定 "在 pH 敏感性亲水聚合物(HAMAFA-b-DBAM)的疏水段和中空介孔二氧化硅纳米粒子(HMS)表面之间,而中空介孔二氧化硅纳米粒子则由长链碳氢化合物十八烷基三甲氧基硅烷(C18)修饰。由于两亲性聚合物与叶酸(FA)基团共轭,纳米复合材料能有效靶向过度表达的肿瘤细胞的叶酸受体(FR)。此外,由于 HMS 的中空内核,还能同时获得较高的药物负载量。当癌细胞内的 pH 值呈弱酸性时,对 pH 值敏感的聚合物外壳会发生水解,从而使负载的药物从 HMS 内核中释放出来。由于 SPIONPs 的磁性,纳米复合材料的靶向过程很容易被磁共振成像跟踪。因此,通过 HMS 内核、磁性 Fe3O4 纳米粒子和可靶向的 pH 敏感聚合物外壳的自组装,获得了一种具有高载药量和可控药物释放特性的纳米载体,可用于肿瘤诊断和治疗。
Amphiphilic Polymeric Nanocarriers with Luminescent Gold Nanoclusters for Concurrent Bioimaging and Controlled Drug Release
作者:Dongyun Chen、Zhentao Luo、Najun Li、Jim Yang Lee、Jianping Xie、Jianmei Lu
DOI:10.1002/adfm.201300411
日期:2013.9.20
biocompatibility, strong clinical imaging capability, and target specificity are the desired features of future medicine. Here, the design of a theranostic nanocomposite capable of simultaneous targeting and imaging of the cancer cells is presented. It releases its drug payload by a controlled release mechanism. The nanocomposite contains luminescentgoldnanocluster (L‐AuNC) photostable and biocompatible
Base-Catalyzed Povarov Reaction: An Unusual [1,3] Sigmatropic Rearrangement to Dihydropyrimidobenzimidazoles
作者:Chih-Hau Chen、Gorakh S. Yellol、Po-Tsung Lin、Chung-Ming Sun
DOI:10.1021/ol201985p
日期:2011.10.7
A novel base-catalyzed Povarov reaction of arylamines, aldehydes, and electron-deficient dienophiles has been developed. An unprecedented in situ [1,3] sigmatropic rearrangement leading to 4,10-dihydropyrimido[1,2-a]benzimidazoles has also been discovered. An insight of the plausible mechanism is discussed and supported by X-ray crystal study. This cascade reaction is achieved in a one-pot multicomponent
已开发出一种新颖的碱催化的芳基胺,醛和缺电子的亲二烯体的Povarov反应。还发现了导致4,10-二氢嘧啶基[1,2- a ]苯并咪唑的前所未有的原位[1,3]σ重排。X射线晶体研究讨论并支持了对可能机制的见解。在微波条件下,在可溶性载体上以单锅多组分方式实现该级联反应。