Frolova Liubov, Li Isaac T S
Department of Chemistry, The University of British Columbia, Kelowna, BC V1V 1V7, Canada.
Bioengineering (Basel). 2022 Sep 22;9(10):496. doi: 10.3390/bioengineering9100496.
Extracellular vesicles (EVs) are highly promising as drug delivery vehicles due to their nanoscale size, stability and biocompatibility. EVs possess natural targeting abilities and are known to traverse long distances to reach their target cells. This long-range organotropism and the ability to penetrate hard-to-reach tissues, including the brain, have sparked interest in using EVs for the targeted delivery of pharmaceuticals. In addition, EVs can be readily harvested from an individual's biofluids, making them especially suitable for personalized medicine applications. However, the targeting abilities of unmodified EVs have proven to be insufficient for clinical applications. Multiple attempts have been made to bioengineer EVs to fine-tune their on-target binding. Here, we summarize the current state of knowledge on the natural targeting abilities of native EVs. We also critically discuss the strategies to functionalize EV surfaces for superior long-distance targeting of specific tissues and cells. Finally, we review the challenges in achieving specific on-target binding of EV nanocarriers.
细胞外囊泡(EVs)由于其纳米级尺寸、稳定性和生物相容性,作为药物递送载体具有很大的前景。EVs具有天然的靶向能力,并且已知能够远距离穿越到达其靶细胞。这种远距离的器官趋向性以及穿透包括大脑在内的难以到达的组织的能力,引发了人们对使用EVs进行药物靶向递送的兴趣。此外,EVs可以很容易地从个体的生物流体中获取,这使得它们特别适合个性化医学应用。然而,未经修饰的EVs的靶向能力已被证明不足以用于临床应用。人们已经进行了多次尝试,对EVs进行生物工程改造以微调其靶向结合。在这里,我们总结了关于天然EVs天然靶向能力的当前知识状态。我们还批判性地讨论了使EV表面功能化以实现对特定组织和细胞的卓越远距离靶向的策略。最后,我们回顾了实现EV纳米载体特异性靶向结合所面临的挑战。
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