Nanodiamonds-in-oil emulsions elicit potent immune responses for effective vaccination and therapeutics

Author:

Lin Hsin-Hung1ORCID,Wang Chih-Yen1,Hsieh Feng-Jen1,Liao Fang-Zhen1,Su Yu-Kai1,Pham Minh Dinh2,Lee Chih-Yuan3,Chang Huan-Cheng145ORCID,Hsu Hsao-Hsun36ORCID

Affiliation:

1. Institute of Atomic & Molecular Sciences, Academia Sinica, Taipei 106, Taiwan

2. Institute of Biotechnology, Vietnam Academy of Science & Technology, Ha Noi 100000, Vietnam

3. Department of Surgery, National Taiwan University Hospital & College of Medicine, National Taiwan University, Taipei 100, Taiwan

4. Department of Chemical Engineering, National Taiwan University of Science & Technology, Taipei City 106, Taiwan

5. Department of Chemistry, National Taiwan Normal University, Taipei City 106, Taiwan

6. National Taiwan University Cancer Center, National Taiwan University, Taipei 106, Taiwan

Abstract

Background: The use of nanodiamonds (NDs) and fluorescent nanodiamonds (FNDs) as nonallergenic biocompatible additives in incomplete Freund’s adjuvant (IFA) to elicit immune responses in vivo was investigated. Methods: C57BL/6 mice were immunized with chicken egg ovalbumin (OVA) in IFA and also OVA-conjugated NDs (or OVA-conjugated FNDs) in IFA to produce antibodies. OVA-expressing E.G7 lymphoma cells and OVA-negative EL4 cells were inoculated in mice to induce tumor formation. Results: The new formulation significantly enhanced immune responses and thus disease resistance. It exhibited specific therapeutic activities, effectively inhibiting the growth of E.G7 tumor cells in mice over 35 days. Conclusion: The high biocompatibility and multiple functionalities of NDs/FNDs render them applicable as active and trackable vaccine adjuvants and antitumor agents.

Funder

Ministry of Science and Technology, Taiwan

Publisher

Future Medicine Ltd

Subject

Development,General Materials Science,Biomedical Engineering,Medicine (miscellaneous),Bioengineering

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