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Well-defined cross-linked antioxidant nanozymes for treatment of ischemic brain injury.


ABSTRACT: Development of well-defined nanomedicines is critical for their successful clinical translation. A simple synthesis and purification procedure is established for chemically cross-linked polyion complexes of Cu/Zn superoxide dismutase (SOD1) or catalase with a cationic block copolymer, methoxy-poly(ethylene glycol)-block-poly(L-lysine hydrochloride) (PEG-pLL??). Such complexes, termed cross-linked nanozymes (cl-nanozymes) retain catalytic activity and have narrow size distribution. Moreover, their cytotoxicity is decreased compared to non-cross-linked complexes due to suppression of release of the free block copolymer. SOD1 cl-nanozymes exhibit prolonged ability to scavenge experimentally induced reactive oxygen species (ROS) in cultured brain microvessel endothelial cells and central neurons. In vivo they decrease ischemia/reperfusion-induced tissue injury and improve sensorimotor functions in a rat middle cerebral artery occlusion (MCAO) model after a single intravenous (i.v.) injection. Altogether, well-defined cl-nanozymes are promising modalities for attenuation of oxidative stress after brain injury.

SUBMITTER: Manickam DS 

PROVIDER: S-EPMC3597468 | biostudies-literature | 2012 Sep

REPOSITORIES: biostudies-literature

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Well-defined cross-linked antioxidant nanozymes for treatment of ischemic brain injury.

Manickam Devika S DS   Brynskikh Anna M AM   Kopanic Jennifer L JL   Sorgen Paul L PL   Klyachko Natalia L NL   Batrakova Elena V EV   Bronich Tatiana K TK   Kabanov Alexander V AV  

Journal of controlled release : official journal of the Controlled Release Society 20120810 3


Development of well-defined nanomedicines is critical for their successful clinical translation. A simple synthesis and purification procedure is established for chemically cross-linked polyion complexes of Cu/Zn superoxide dismutase (SOD1) or catalase with a cationic block copolymer, methoxy-poly(ethylene glycol)-block-poly(L-lysine hydrochloride) (PEG-pLL₅₀). Such complexes, termed cross-linked nanozymes (cl-nanozymes) retain catalytic activity and have narrow size distribution. Moreover, thei  ...[more]

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