Anticancer efficacies of cisplatin-releasing pH-responsive nanoparticles

Biomacromolecules
Peisheng XuYouqing Shen

Abstract

The objective of these investigations was to test the hypothesis that a rapid cytoplasmic release profile from nanoparticles would potentiate the anticancer activity of cisplatin. Cisplatin-loaded nanoparticles with pH-responsive poly[2-(N,N-diethylamino)ethyl methacrylate] (PDEA) cores were synthesized from PDEA-block-poly(ethylene glycol) (PDEA-PEG) copolymer by using a solvent-displacement (acetone-water) method. Nanoparticles with pH-nonresponsive poly(epsilon-caprolactone) (PCL) cores made from PCL-block-PEG (PCL-PEG) were used for comparison. Nanoparticle sizes, zeta potentials, drug-loading capacities, and pH responsiveness were characterized. The cellular uptakes and localization in lysosomes were visualized by using confocal fluorescence microscopy. Cytostatic effects of free and encapsulated cis-diammineplatinum(II) dichloride (cisplatin) toward human SKOV-3 epithelial ovarian cancer cells were estimated by using the MTT assay. Intraperitoneal tumor responses to cisplatin and cisplatin/PDEA-PEG were evaluated in athymic mice at 4-6 weeks postinoculation of SKOV-3 cells. PDEA-PEG nanoparticles dissolved at pH < 6 and rapidly internalized and transferred to lysosomes; it therefore was predicted that the PDEA nanoparticl...Continue Reading

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