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Cancer Immunol Immunother. 2016 Sep;65(9):1075-83. doi: 10.1007/s00262-016-1869-7. Epub 2016 Jul 15.

Uptake of synthetic naked RNA by skin-resident dendritic cells via macropinocytosis allows antigen expression and induction of T-cell responses in mice.

Author information

1
TRON-Translational Oncology at the University Medical Center of Johannes Gutenberg University gGmbH, Freiligrathstraße 12, 55131, Mainz, Germany.
2
Research Center for Immunotherapy (FZI), University Medical Center of Johannes Gutenberg University, Mainz, Germany.
3
Department of Dermatology, University Medical Center of Johannes Gutenberg University, Mainz, Germany.
4
Cluster for Individualized Immune Intervention (CI3), Mainz, Germany.
5
BioNTech RNA Pharmaceuticals GmbH, Mainz, Germany.
6
TRON-Translational Oncology at the University Medical Center of Johannes Gutenberg University gGmbH, Freiligrathstraße 12, 55131, Mainz, Germany. Mustafa.Diken@TrOn-Mainz.de.
7
BioNTech RNA Pharmaceuticals GmbH, Mainz, Germany. Mustafa.Diken@TrOn-Mainz.de.
8
TRON-Translational Oncology at the University Medical Center of Johannes Gutenberg University gGmbH, Freiligrathstraße 12, 55131, Mainz, Germany. Sebastian.Kreiter@TrOn-Mainz.de.
9
BioNTech RNA Pharmaceuticals GmbH, Mainz, Germany. Sebastian.Kreiter@TrOn-Mainz.de.

Abstract

Intradermal administration of antigen-encoding RNA has entered clinical testing for cancer vaccination. However, insight into the underlying mechanism of RNA uptake, translation and antigen presentation is still limited. Utilizing pharmacologically optimized naked RNA, the dose-response kinetics revealed a rise in reporter signal with increasing RNA amounts and a prolonged RNA translation of reporter protein up to 30 days after intradermal injection. Dendritic cells (DCs) in the dermis were shown to engulf RNA, and the signal arising from the reporter RNA was significantly diminished after DC depletion. Macropinocytosis was relevant for intradermal RNA uptake and translation in vitro and in vivo. By combining intradermal RNA vaccination and inhibition of macropinocytosis, we show that effective priming of antigen-specific CD8(+) T-cells also relies on this uptake mechanism. This report demonstrates that direct antigen translation by dermal DCs after intradermal naked RNA vaccination is relevant for efficient priming of antigen-specific T-cells.

KEYWORDS:

Cancer immunotherapy; Dermal dendritic cell; Intradermal vaccination; Macropinocytosis; Naked RNA; RNA vaccine

PMID:
27422115
DOI:
10.1007/s00262-016-1869-7
[Indexed for MEDLINE]

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