脂质体
微气泡
药物输送
阿霉素
体内
基质金属蛋白酶
体内分布
外渗
纳米载体
化学
药理学
PEG比率
靶向给药
细胞毒性
毒品携带者
体外
超声波
医学
生物物理学
化疗
病理
生物化学
外科
生物
有机化学
经济
生物技术
放射科
财务
作者
Marieke Olsman,Viktoria Sereti,Kristine Andreassen,Sofie Snipstad,Annemieke van Wamel,Rasmus Eliasen,Sigrid Berg,Andrew J. Urquhart,Thomas Lars Andresen,Catharina de Lange Davies
标识
DOI:10.1016/j.jconrel.2020.06.024
摘要
To improve therapeutic efficacy of nanocarrier drug delivery systems, it is essential to improve their uptake and penetration in tumour tissue, enhance cellular uptake and ensure efficient drug release at the tumour site. Here we introduce a tumour targeting drug delivery system based on the ultrasound-mediated delivery of enzyme sensitive liposomes. These enzyme sensitive liposomes are coated with cleavable poly(ethylene glycol) (PEG) which will be cleaved by two members of the enzyme matrix metalloproteinase family (MMP-2 and MMP-9). Cleavage of the PEG coat can increase cellular uptake and will destabilize the liposomal membrane which can result in accelerated drug release. The main aim of the work was to study the effect of focused ultrasound and microbubbles on the delivery and therapeutic efficacy of the MMP sensitive liposome. The performance of the MMP sensitive liposome was compared to a non-MMP sensitive version and Doxil-like liposomes. In vitro, the cellular uptake and cytotoxicity of the liposomes were studied, while in vivo the effect of ultrasound and microbubbles on the tumour accumulation, biodistribution, microdistribution, and therapeutic efficacy were investigated. For all tested liposomes, ultrasound and microbubble treatment resulted in an improved tumour accumulation, increased extravasation, and increased penetration of the liposomes from blood vessels into the extracellular matrix. Surprisingly, penetration depth was independent of the ultrasound intensity used. Ultrasound-mediated delivery of free doxorubicin and the Doxil-like and MMP sensitive liposome resulted in a significant reduction in tumour volume 28 days post the first treatment and increased median survival. The MMP sensitive liposome showed better therapeutic efficacy than the non-MMP sensitive version indicating that cleaving the PEG-layer is important. However, the Doxil-like liposome outcompeted the MMP and non-MMP sensitive liposome, both with and without the use of ultrasound and microbubbles.
科研通智能强力驱动
Strongly Powered by AbleSci AI