Co-delivery of the NKT agonist α-galactosylceramide and tumor antigens to cross-priming dendritic cells breaks tolerance to self-antigens and promotes antitumor responses.

Abstract:

:Vaccines designed to abrogate the tolerance of tumor self-antigens and amplify cytotoxic CD8+ T cells (CTLs) have promise for the treatment of cancer. Type I natural killer (NKT) cells have attracted considerable interest in the cancer therapy field. In the current study, we have exploited the unique ability of NKT cells to serve as T-helper cells to license dendritic cells (DCs) for cross priming with the aim to generate efficient CTL antitumor responses. To this end, we designed a nanoparticle-based vaccine to target cross-priming DCs via the Clec9a endocytic pathway. Our results showed for the first time that simultaneous co-delivery of the NKT agonist α-galactosylceramide and tumor self-antigens (Trp2 and gp100) to CD8α+ DCs promotes strong antitumor responses in prophylactic and therapeutic settings (advanced solid tumor model in the mouse). We attributed the vaccine's therapeutic effects to NKT cells (but not to T-helper lymphocytes) and CD8+ T cells. Efficacy was correlated with an elevated ratio between tumor antigen-specific CD8+ T cells and regulatory CD4+ T lymphocytes within the tumor. The nanoparticle-based vaccine actively targeted human CLEC9A-expressing BDCA3+ DCs - the equivalent of murine cross-priming CD8α+ DCs - and induced a strong expansion of effector memory tumor self-antigen (Melan -A)-specific CD8+ T cells from peripheral blood mononuclear cells sourced from healthy donors and melanoma patients. Together, our result shed light on novel therapeutic approaches for controlling tumor development.

journal_name

Oncoimmunology

journal_title

Oncoimmunology

authors

Ghinnagow R,De Meester J,Cruz LJ,Aspord C,Corgnac S,Macho-Fernandez E,Soulard D,Fontaine J,Chaperot L,Charles J,Soncin F,Mami-Chouaib F,Plumas J,Faveeuw C,Trottein F

doi

10.1080/2162402X.2017.1339855

subject

Has Abstract

pub_date

2017-08-18 00:00:00

pages

e1339855

issue

9

eissn

2162-4011

issn

2162-402X

pii

1339855

journal_volume

6

pub_type

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