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Matrix metalloproteinase-cleavable nanocapsules for tumor-activated drug release

机译:用于肿瘤活化药物释放的基质金属蛋白酶 - 可切割的纳米胶囊

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In the war against cancer, nanotechnology-based drug delivery systems may play a significant role by enhancing the efficacy of conventional therapies. Here, we tried to address some major limitations plaguing anticancer drugs, namely, poor water solubility and off-target toxicity. The systems we propose are cross-linked polyelectrolyte nanocapsules based on an oil-core and a matrix metalloproteinase-2 (MMP-2)-cleavable shell. They can load hydrophobic drugs, prevent their systemic leakage, and release their payload upon an endogenous stimulus. Both the stability enhancement and the stimuli-responsive drug release mechanisms were achieved by cross-linking the nanocapsule shell with an MMP-2-sensitive peptide. On the basis of this strategy, the system maintained its stability in PBS up to one month. Further, when tested on 3D tumor and healthy spheroid models, the nanocapsules were able to disrupt their integrity preferentially in the tumor-like microenvironment. The high level of MMP-2 enzymes expressed by tumor spheroids, indeed, catalyzed the disassembly of the nanocapsules, which ultimately leads to drug release. Therefore, this device holds great potential as a smart system that allows for the safe transport of hydrophobic drugs and for a spatially controlled release upon an endogenous stimulus coming from the very nature of the tumor itself.
机译:在对抗癌症的战争中,基于纳米技术的药物递送系统可以通过提高常规疗法的功效来起到重要作用。在这里,我们试图解决困扰抗癌药物的一些主要限制,即水溶性差和偏离靶向毒性。我们提出的系统是基于油芯和基质金属蛋白酶-2(MMP-2)可切换壳的交联聚电解质纳米胶囊。它们可以加载疏水性药物,防止其系统性泄漏,并在内源性刺激时释放其有效载荷。通过将纳米胶囊壳与MMP-2敏感肽交联来实现稳定性增强和刺激响应药物释放机制。在这一策略的基础上,该系统将其在PBS中保持稳定,最多一个月。此外,当在3D肿瘤和健康的球形模型上测试时,纳米胶囊能够在肿瘤状的微环境中优先地破坏它们的完整性。肿瘤球状体表达的高水平MMP-2酶,实际上催化了纳米胶囊的拆卸,最终导致药物释放。因此,该装置具有巨大的潜力作为智能系统,其允许疏水药物的安全运输以及在来自肿瘤本身的本质上的内源性刺激上的空间控制释放。

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