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Enzyme therapeutics have great potential for the treatment of systemic disorders such as urolithiasis and nephrocalcinosis, which are caused by the excessive accumulation of oxalate. However, exogenous enzymes have short half-lives in vivo and elicit high immunogenicity, which largely limit the therapeutic outcomes. Herein, we report a delivery strategy whereby therapeutic enzymes are encapsulated within a thin zwitterionic polymer shell to form enzyme nanocapsules. The strategy is exemplified by the encapsulation of oxalate oxidase (OxO) for the treatment of hyperoxaluria, because as-synthesized OxO nanocapsules have a prolonged blood circulation half-life and elicit reduced immunogenicity. Our design of enzyme nanocapsules that enable the systemic delivery of therapeutic enzymes can be extended to various biomedical applications.


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Nanocapsules of oxalate oxidase for hyperoxaluria treatment

Show Author's information Ming Zhao1Duo Xu1Di Wu1James W. Whittaker2Robert Terkeltaub3Yunfeng Lu1( )
Department of Chemical and Biomolecular EngineeringUniversity of CaliforniaLos AngelesLos AngelesCA90095USA
Division of Environmental and Biomolecular SystemsOregon Health and Sciences UniversityBeaverton, OR, 97006-8921USA
Division of RheumatologyAllergy and ImmunologySan Diego VA Medical Center3350 La Jolla Village DriveSan DiegoCA92161USA

Abstract

Enzyme therapeutics have great potential for the treatment of systemic disorders such as urolithiasis and nephrocalcinosis, which are caused by the excessive accumulation of oxalate. However, exogenous enzymes have short half-lives in vivo and elicit high immunogenicity, which largely limit the therapeutic outcomes. Herein, we report a delivery strategy whereby therapeutic enzymes are encapsulated within a thin zwitterionic polymer shell to form enzyme nanocapsules. The strategy is exemplified by the encapsulation of oxalate oxidase (OxO) for the treatment of hyperoxaluria, because as-synthesized OxO nanocapsules have a prolonged blood circulation half-life and elicit reduced immunogenicity. Our design of enzyme nanocapsules that enable the systemic delivery of therapeutic enzymes can be extended to various biomedical applications.

Keywords: nanomedicine, protein delivery, enzyme therapeutics, hyperoxaluria, oxalate oxidase, long circulation

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Publication history
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Acknowledgements

Publication history

Received: 16 June 2017
Revised: 23 October 2017
Accepted: 25 October 2017
Published: 12 May 2018
Issue date: May 2018

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Acknowledgements

Acknowledgements

Support for OxO enzyme production from the National Institutes of Health (GM 42680) is gratefully acknowledged.

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