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Theranostics. 2018 Apr 18;8(11):2974-2987. doi: 10.7150/thno.24110. eCollection 2018.

Platinum-Based Nanovectors Engineered with Immuno-Modulating Adjuvant for Inhibiting Tumor growth and Promoting Immunity.

Author information

1
Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai 200032, China.
2
China National Pharmaceutical Engineering and Research Center, China State Institute of Pharmaceutical Industry, Shanghai 201203, China.

Abstract

Although there is ample evidence that the chemotherapeutic drugs trigger an immune response, the efficient tumor rejection or regression is not guaranteed probably due to the massive immunosuppression within the tumor microenvironment. Thus, a rational delivery platform that overcomes immunosuppression is needed to maximally achieve both cytotoxic and immune-modulatory functions of chemotherapeutics. Accumulating evidence suggests that platinum-based drugs might be suitable for this application. Methods: The dendrigraft polylysine (DGL) with its uniform size and multifunctional groups was employed as the polymeric core and conjugated with platinum-based compounds as therapeutics and WKYMVm peptide (Wpep) as a targeting ligand to construct the novel delivery platform Wpep-DGL/Pt. A series of in vitro and in vivo analyses, including physical and chemical characterizations, targeting property, biosafety, and antitumor efficacy of Wpep-DGL/Pt were systematically carried out. Results: Wpep-DGL/Pt showed potent antitumor efficacy in MDA-MB-231 cells tumor-bearing nude mice with a deficient immune system, demonstrating targeted delivery of chemotherapeutics and the resultant cytotoxicity. Furthermore, in immunocompetent mice bearing 4T1 cells tumors, Wpep-DGL/Pt activated immune cells and induced cell death proving their dual function of chemotherapeutic and immunomodulatory efficacy. Conclusion: This work represents a novel approach for cancer immunotherapy by integrating nanotechnology and platinum-based therapeutics which not only efficiently exerts the chemotherapeutic cytotoxic effect on tumor cell but also restores immune response of immunological cells within the tumor microenvironment.

KEYWORDS:

chemotherapy; immune response; platinum; tumor immune microenvironment

Conflict of interest statement

Competing Interests: The authors have declared that no competing interest exists.

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