Immunomodulatory activity of a plant extract containing human papillomavirus 16-E7 protein in human monocyte-derived dendritic cells

P. Di Bonito, F. Grasso, G. Mangino, S. Massa, E. Illiano, R. Franconi, E. Fanales-Belasio, M. Falchi, E. Affabris, C. Giorgi

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This study reports the immunomodulatory activity on human Monocyte Derived Dendritic Cells (MDDCs) of a vaccine preparation shown to be effective against an HPV16-related tumour in an animal model. The vaccine is composed of extract from Nicotiana benthamiana leaves containing HPV16 E7 protein expressed by a potato virus X-derived vector (NbPVX-E7). The effect of the extract was evaluated on MDDC differentiation and maturation by monitoring the phenotypic expression of specific markers. The results show that NbPVX-E7 does not induce monocyte differentiation to dendritic cells, but does induce MDDC maturation. Plant extract does not influence MDDC-uptake of E7-FITC while it significantly improves the Ovalbumin-FITC uptake, considered as a model antigen. Importantly, NbPVX-E7-pulsed MDDCs/PBMCs are able to prime human blood-derived lymphocytes from healthy individuals to induce HPV16 E7-specific cytotoxic activity. This is a propaedeutic study for a possible use of E7-containing plant extract in human immunotherapy of HPV-related lesions. Copyright © by Biolife, s.a.s.
Original languageEnglish
Pages (from-to)967 - 978
Number of pages12
JournalInternational Journal of Immunopathology and Pharmacology
Issue number4
Publication statusPublished - 2009
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology
  • Pharmacology

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