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Intradermal Delivery of Adenoviral Type-35 Vectors Leads to High Efficiency Transduction of Mature, CD8⁺ T Cell-Stimulating Skin-Emigrated Dendritic Cells

Tanja D. de Gruijl^1,2,*, Olga J. A. E. Ophorst^1,, Jaap Goudsmit, Sandra Verhaagh, Sinéad M. Lougheed^*, Katarina Radosevic, Menzo J. E. Havenga and Rik J. Scheper

^* Department of Medical Oncology, Vrije Universiteit University Medical Center, Amsterdam, The Netherlands; Department of Pathology, Vrije Universiteit University Medical Center, Amsterdam, The Netherlands; and Crucell Holland BV, Leiden, The Netherlands

Recombinant adenovirus (Ad) type 35 (rAd35) shows great promise as vaccine carrier with the advantage of low pre-existing immunity in human populations, in contrast to the more commonly used rAd5 vector. The rAd35 vector uses CD46 as a high-affinity receptor, which, unlike the rAd5 receptor, is expressed on human dendritic cells (DC), the most powerful APCs identified to date. In this study, we show that in contrast to rAd5, rAd35 infects migrated and mature CD83⁺ cutaneous DC with high efficiency (up to 80%), when delivered intradermally in an established human skin explant model. The high transduction efficiency is in line with high expression levels of CD46 detected on migratory cutaneous DC, which proved to be further increased upon intradermal administration of GM-CSF and IL-4. As compared with Ad5, these Ad35 infection characteristics translate into higher absolute numbers of skin-emigrated DC per explant that both express the transgene and are phenotypically mature. Finally, we demonstrate that upon intracutaneous delivery of a rAd35 vaccine encoding the circumsporozoite (CS) protein of Plasmodium falciparum, emigrated DC functionally express and process CS-derived epitopes and are capable of activating specific CD8⁺ effector T cells, as evidenced by activation of an HLA-A2-restricted CS-specific CD8⁺ T cell clone. Collectively, these data demonstrate the utility of rAd35 vectors for efficient in vivo human DC transduction.

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