期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 17, 页码 19295-19306出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02769
关键词
pH-sensitive; charge conversion; zwitterionic copolymer; shielding system; shVEGF
资金
- National Natural Science Foundation of China [51925305, 51873208, 51973217, 51520105004, 51803210]
- National Science and Technology Major Projects for Major New Drugs Innovation and Development [2018ZX09711003-012]
- Jilin Province Science and Technology Development Program [20180414027GH]
Recently, pH-sensitive polymers have received extensive attention in tumor therapy. However, the rapid response to pH changes is the key to achieving efficient treatment. Here, a novel shielding system with a rapidly pH-responsive polymer (PAMT) is synthesized by click reaction between poly(gamma-allyl-L-glutamate) and thioglycolic acid or 2-(Boc-amino)ethanethiol. The zwitterionic biodegradable polymer PAMT, which is negatively charged at physiological pH, can be used to shield positively charged nanoparticles. PAMT is electrostatically attached to the surface of the positively charged PEI/pDNA complex to form a ternary complex. The zwitterionic PAMT-shielded complex exhibits rapid charge conversion when the pH decreases from 7.4 to 6.8. For the in vivo tumor inhibition experiment, PAMT/PEI/shVEGF injected intravenously shows a more significant inhibitory effect on tumor growth. The excellent results are mainly attributed to introduction of the zwitterionic copolymer PAMT, which can shield the positively charged PEI/shVEGF complex in physiological conditions, while the surface potential of the shielded complexes changes to a positive charge in the acidic tumor environment.
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