Intra-cheek immunization as a novel vaccination route for therapeutic vaccines of head and neck squamous cell carcinomas using plasmo virus-like particles

Rodney Macedo, Juliette Rochefort, Maude Guillot-Delost, Kae Tanaka, Aline Le Moignic, Clara Noizat, Claude Baillou, Véronique Mateo, Antoine F. Carpentier, Eric Tartour, Chloé Bertolus, Bertrand Bellier, Géraldine Lescaille, François M. Lemoine

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Despite current therapy, head and neck squamous cell carcinomas (HNSCCs) arising from various mucosal sites of the upper aero-digestive tract frequently relapse in a loco-regional manner and have a poor prognosis. Our objective was to validate an innovative mucosal route of vaccination using plasmo virus-like particles (pVLPs) in a pre-clinical orthotopic model of HNSCCs. For this purpose, we used pVLP-E7, that are plasmid DNA encoding retroviral virus-like particles carrying a truncated E7 oncoprotein from HPV-16 as antigen model, to vaccinate mice bearing pre-established TC-1 tumors implanted into the buccal mucosa. pVLP-E7 were combined with clinical grade TLR agonists (Imiquimod and CpG-ODN). In this pre-clinical orthotopic model, whose tumor microenvironment resembles to those of human HNSCCs, different mucosal vaccination routes were tested for their ability to elicit efficient immune and antitumoral responses. Results showed that mucosal intra-cheek (IC) vaccinations using pVLP-E7, comparatively to intradermic vaccinations (ID), gave rise to higher mobilization of mucosal (CD49a+) CD8+ specific effector T cells in both tumor draining lymph nodes (TdLNs) and tumor microenvironment resulting in better antitumor effects and in a long-term protection against tumor rechallenge. In vivo CD8+ depletion demonstrated that antitumoral effects were fully dependent upon the presence of CD8+ T cells. Validation of IC mucosal vaccinations with pVLPs combined with adjuvants using a pre-clinical orthotopic model of HNSCC provides valuable pre-clinical data to rapidly envision the use of such therapeutic vaccines in patients with HNSCCs, inasmuch as vaccinal components and adjuvants can be easily obtained as clinical grade reagents.

Original languageEnglish (US)
Article numbere1164363
JournalOncoImmunology
Volume5
Issue number7
DOIs
StatePublished - Jul 2 2016
Externally publishedYes

Keywords

  • Head and neck squamous cell-carcinomas;
  • intra-cheek route
  • mucosal immunization
  • plasmo virus-like particles
  • pre-clinical orthotopic model
  • therapeutic vaccines
  • tumor microenvironment

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Oncology

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