Reduction and pH dual-bioresponsive crosslinked polymersomes for efficient intracellular delivery of proteins and potent induction of cancer cell apoptosis.

Abstract:

:The clinical applications of protein drugs are restricted because of the absence of viable protein delivery vehicles. Here, we report on reduction- and pH--sensitive crosslinked polymersomes based on the poly(ethylene glycol)-poly(acrylic acid)-poly(2-(diethyl amino)ethyl methacrylate) (PEG-PAA-PDEA) triblock copolymer for efficient intracellular delivery of proteins and the potent induction of cancer cell apoptosis. PEG-PAA-PDEA (1.9-0.8-8.2kgmol(-1)) was synthesized by controlled reversible addition-fragmentation chain transfer polymerization and further modified with cysteamine to yield the thiol-containing PEG-PAA(SH)-PDEA copolymer. PEG-PAA(SH)-PDEA was water-soluble at acidic and physiological pH but formed robust and monodisperse polymersomes with an average size of ∼35nm upon increasing the pH to 7.8 or above followed by oxidative crosslinking. These disulfide-crosslinked polymersomes, while exhibiting excellent colloidal stability, were rapidly dissociated in response to 10mM glutathione at neutral or mildly acidic conditions. Notably, these polymersomes could efficiently load proteins like bovine serum albumin and cytochrome C (CC). The in vitro release studies revealed that protein release was fast and nearly quantitative under the intracellular-mimicking reducing environment. Confocal microscopy observations showed that these dual-sensitive polymersomes efficiently released fluorescein isothiocyanate-CC into MCF-7 cells in 6h. Most remarkably, MTT assays showed that CC-loaded dual-sensitive polymersomes induced potent cancer cell apoptosis, in which markedly decreased cell viabilities of 11.3%, 8.1% and 52.7% were observed for MCF-7, HeLa and 293T cells, respectively, at a CC dosage of 160μgml(-1). In contrast, free CC caused no cell death under otherwise the same conditions. These dual-bioresponsive polymersomes have appeared as a multifunctional platform for active intracellular protein release.

journal_name

Acta Biomater

journal_title

Acta biomaterialia

authors

Sun H,Meng F,Cheng R,Deng C,Zhong Z

doi

10.1016/j.actbio.2014.01.010

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

2159-68

issue

5

eissn

1742-7061

issn

1878-7568

pii

S1742-7061(14)00015-4

journal_volume

10

pub_type

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