Volume 17, Issue 14 2005993
Full Paper

Development of Facile and Versatile Platinum Drug Delivering Silicasome Nanocarriers for Efficient Pancreatic Cancer Chemo-Immunotherapy

Xiangsheng Liu

Xiangsheng Liu

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

California NanoSystems Institute, University of California, Los Angeles, CA, 90095 USA

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Jinhong Jiang

Jinhong Jiang

California NanoSystems Institute, University of California, Los Angeles, CA, 90095 USA

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Chong Hyun Chang

Chong Hyun Chang

California NanoSystems Institute, University of California, Los Angeles, CA, 90095 USA

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Yu-Pei Liao

Yu-Pei Liao

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Jared J. Lodico

Jared J. Lodico

California NanoSystems Institute, University of California, Los Angeles, CA, 90095 USA

Department of Physics and Astronomy, University of California, Los Angeles, CA, 90095 USA

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Ivanna Tang

Ivanna Tang

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Emily Zheng

Emily Zheng

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Waveley Qiu

Waveley Qiu

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Matthew Lin

Matthew Lin

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Xiang Wang

Xiang Wang

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Ying Ji

Ying Ji

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Kuo-Ching Mei

Kuo-Ching Mei

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

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Andre E. Nel

Corresponding Author

Andre E. Nel

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

California NanoSystems Institute, University of California, Los Angeles, CA, 90095 USA

E-mail: [email protected], [email protected]

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Huan Meng

Corresponding Author

Huan Meng

Division of Nanomedicine, Department of Medicine, University of California, Los Angeles, CA, 90095 USA

California NanoSystems Institute, University of California, Los Angeles, CA, 90095 USA

E-mail: [email protected], [email protected]

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First published: 07 March 2021
Citations: 48

Abstract

In this study a mesoporous silica nanoparticle (MSNP) based platform is developed for high-dose loading of a range of activated platinum (Pt) chemo agents that can be attached to the porous interior through the use of electrostatic and coordination chemistry under weak-basic pH conditions. In addition to the design feature for improving drug delivery, the MSNP can also be encapsulated in a coated lipid bilayer (silicasome), to improve the colloidal stability after intravenous (IV) injection. Improved pharmacokinetics and intratumor delivery of encapsulated activated oxaliplatin (1,2-diamminocyclohexane platinum(II) (DACHPt)) over free drug in an orthotopic Kras-derived pancreatic cancer (PDAC) model is demonstrated. Not only does IV injection of the DACHPt silicasome provide more efficacious cytotoxic tumor cell killing, but can also demonstrate that chemotherapy-induced cell death is accompanied by the features of immunogenic cell death (ICD) as well as a dramatic reduction in bone marrow toxicity. The added ICD features are reflected by calreticulin and high-mobility group box 1 expression, along with increased CD8+/FoxP3+ T-cell ratios and evidence of perforin and granzyme B release at the tumor site. Subsequent performance of a survival experiment, demonstrates that the DACHPt silicasome generates a significant improvement in survival outcome, which can be extended by delayed administration of the anti-PD-1 antibody.

Conflict of Interest

A.E.N. and H.M. are co-founders, board members, and equity holders in Westwood Bioscience Inc. UCLA entered into a sponsored research agreement with Westwood Bioscience Inc. A.E.N. and H.M. are also co-founders and equity holders in NAMMI therapeutics. The remaining authors declared no conflict of interest.

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