文献:Autophagy blockade synergisticallyenhances nanosonosensitizer-enabled sonodynamic cancer nanotherapeutics
文献链接:https://pubmed.ncbi.nlm.nih.gov/33879173/
作者:Liqiang Zhou, Minfeng Huo, Xiaoqin Qian, Li Ding, Luodan Yu, Wei Feng, Xinwu Cui,Yu Chen
相关产品:
Cy5.5-DSPE-PEG 花菁染料Cy5.5-磷脂-聚乙二醇
原文摘要:Ultrasound-triggered sonodynamic therapy (SDT) represents an emerging therapeutic modality for cancer treatment based on its specifc feature of noninvasiveness, high tissue-penetrating depth and desirable therapeutic efcacy, but the SDT-induced pro-survival cancer-cell autophagy would signifcantly lower the SDT efcacy for cancer treatment. Here we propose an “all-in-one” combined tumor-therapeutic strategy by integrating nanosonosensitizers-augmented noninvasive SDT with autophagy inhibition based on the rationally constructed nanoliposomes that co-encapsulates clinically approved sonosensitizers protoporphyrin IX (PpIX) and early-phase autophagy-blocking agent 3-methyladenine (3-MA). It has been systematically demonstrated that nanosonosensitizers-augmented SDT induced cytoprotective pro-survival autophagy through activation of MAPK signaling pathway and inhibition of AMPK signaling pathway, and this could be efcaciously inhibited by 3-MA in early-phase autophagy, which signifcantly decreased the cell resistance to intracellular oxidative stress and complied a remarkable synergistic efect on SDT medicated cancer-cell apoptosis both in vitro at cellular level and in vivo on tumor-bearing animal model. Therefore, our results provide a proof-of-concept combinatorial tumor therapeutics based on nanosonosensitizers for the treatment of ROS-resistant cancer by autophagy inhibition-augmented SDT.
DPPC和DSPE-PEG-2000都是磷脂类化合物,在生物学和医学领域有应用。DPPC是一种饱和磷脂,具有两个棕榈酰基团作为疏水尾部,以及一个磷酸胆碱头部作为亲水部分。DPPC常用于制备人工肺表面活性剂,以替代或补充天然肺表面活性剂的功能。DSPE-PEG-2000是一种无害且可生物降解的两亲性共聚物。它能够改善体内循环时间,稳定封装化合物,并可用于形成胶束来传递纳米颗粒。PpIX/3MA@Lip纳米脂质体是一种特殊的化合物制剂,通过调节脂质体的组成和结构,可以实现化合物的可控释放,满足不同需求,尽管PpIX/3MA@Lip纳米脂质体具有诸多优势,但在实际应用中仍需注意,该文献介绍了DPPC和DSPE-PEG-2000在制备PpIX/3MA@Lip纳米脂质体中有许多应用,具体如下:
图为:工程PpIX/3-MA@Lip纳米传感器仪
DPPC、DSPE-PEG-2000在PpIX/3MA@Lip纳米脂质体制备中的应用:
采用反蒸发法合成了PpIX/3-MA@Lip。首先,将PpIX和3-MA分别溶解在甲醇中。将PpIX和3-MA依次加入含有DPPC、DSPE-PEG-2000和胆固醇的氯仿溶液中。彻底混合后,在旋转蒸发器上进行反向蒸发。随后,将压力降低,继续旋转蒸发,以完全去除溶剂,获得脂质flm。在脂质flm中加入PBS,完成水化过程。最后,用微挤出机进行挤压工艺获得脂质体,再通过透析纯化。Te产生的纳米脂质体存储。
图为:PpIX/3-MA@Lip纳米脂质体的结构、组成和理化性质特征研究
DPPC 是一种常用的磷脂,在纳米脂质体的制备中,它是构成脂质体膜的主要成分之一。DPPC 分子具有亲水性的头部和疏水性的尾部,这种两性分子结构使其能够在水溶液中自发地形成双层膜结构。在 PpIX/3MA@Lip 纳米脂质体中,DPPC 的双层膜为包裹的化合物(如 PpIX 和 3MA)提供了一个稳定的物理屏障,将化合物与外界环境隔离开来,防止化合物泄漏。DSPE - PEG - 2000 中的 PEG 链段具有亲水性,在纳米脂质体表面形成一层水化层。这层水化层可以产生空间位阻效应,防止脂质体之间的聚集,使脂质体在溶液中能够保持良好的分散状态。对于 PpIX/3MA@Lip 纳米脂质体来说,这种稳定性和分散性有助于在储存和运输过程中保持其均匀的粒径分布,避免因颗粒团聚而导致的化合物分布不均等问题。