Folate-Decorated and Reduction-Sensitive Micelles Assembled from Amphiphilic Polymer鈥揅amptothecin Conjugates for Intracellular Drug Delivery

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• 作者：Chaoyu Liu ; Jiang Yuan ; Xiaoming Luo ; Maohua Chen ; Zhoujiang Chen ; Yuancong Zhao ; Xiaohong Li
• 刊名：Molecular Pharmaceutics
• 出版年：2014
• 出版时间：November 3, 2014
• 年：2014
• 卷：11
• 期：11
• 页码：4258-4269
• 全文大小：658K
• ISSN：1543-8392

文摘

It is one of the challenges for a wide clinical application of polymer micelles to address the structure disintegration and premature drug release before reaching a pathological site. In the current study, folic acid (FA)-decorated polymer鈥揹rug conjugates (FSC) were synthesized with disulfide linkages between camptothecin (CPT) and amphiphilic poly(ethylene glycol)-b-poly(蔚-caprolactone) (PECL) copolymers. FSC conjugates were proposed to assemble into micelles with a hydrophobic core of PCL segments and CPT and a hydrophilic corona of PEG segments. The addition of hexadecanol during micelle formation (FSC-16) was proposed to modulate the interactions of hydrophobic segments in micelles and enhance the reductive sensitivity. FSC-16 micelles were obtained with critical micelle concentration of around 2 渭g/mL and an average size of around 200 nm, and the conjugated CPT was rapidly released out in response to glutathione. The reductive sensitivity was also demonstrated with respect to the changes of micelle size and morphologies as well as the fluorescent intensity of pyrene loaded in micelles. Benefiting from the FA receptor-mediated uptake and the reduction-sensitive release of CPT, significant cytotoxicity and cell apoptosis were identified for FSC-16 micelles against SKOV-3 cells with strong expressions of FA receptors. Flow cytometry and confocal laser scanning microscopy analyses demonstrated that CPT was distributed into nuclei after cellular uptake and intracellular release from FSC-16 micelles. Thus, the FA-decorated and reduction-sensitive micelles assembled from polymer鈥揹rug conjugates show advantages in inhibiting premature release during circulation, enhancing cellular uptake at the tumor tissues, and promoting intracellular release and nuclei location of the active moieties.

Keywords:

polymer鈭抎rug conjugate micelle; disulfide linkage; folic acid decoration; reductive sensitivity; nucleus localization