Polymer coated ceria nanoparticles for selective cytoprotection
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United States of America Patent
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Sep 1, 2015
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Jul 8, 2008
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Jul 16, 2007
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Abstract
Methods, systems and compositions are disclosed wherein normal, non-transformed, healthy biological cells are protected from oxidative stress, radiation therapy and chemotherapy while diseased, transformed cells, such as, cancer cells, are provided no protection by the biocompatible, polymer coated nanoceria composition of the present invention. The polymer-coated nanoceria preparation herein exhibits no toxicity to normal cells and exhibits pH-dependent antioxidant properties at neutral or physiological pH values, between approximately 6.5 to approximately 11.0 and is inactive as an antioxidant at acidic pH values between approximately 2.0 to approximately 6.4. Improved therapeutic agents and cytoprotecting devices are based on the newly discovered, pH dependent properties of polymer-coated nanoceria that provide selective cytoprotection.
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