© The Rockefeller University Press, 0022-1007/1999/1/169/ $5.00
The Journal of Experimental Medicine, Volume 189, Number 1, January 4, 1999 169-178
DNA Vaccination: Transfection and Activation of Dendritic Cells as Key Events for Immunity
Omid Akbari*,
Naveed Panjwani*,
Sylvie Garcia*,
Ricardo Tascon
,
Doug Lowrie
, and
Brigitta Stockinger*
From the * Division of Molecular Immunology and the
Division of Mycobacterial Research, The National Institute for Medical Research, London NW7 1AA, United Kingdom
The mechanisms underlying initiation and maintenance of CD4 T cell responses after DNA vaccination were studied using a construct coding for nonsecreted fifth component of complement (C5) protein, thus restricting the availability of antigen. The only cell types to express C5 were keratinocytes at the site of DNA application and a small number of dendritic cells present in the draining lymph nodes. Antigen expression persisted for up to 12 wk in keratinocytes, but dendritic cells did not express C5 beyond 2 wk after vaccination. Cross-priming of dendritic cells by C5 expressed in keratinocytes did not occur unless keratinocyte death was induced by irradiation in vitro. CD4 T cells were activated in the draining lymph nodes only and subsequently migrated to the spleen, where memory T cells persisted for longer than 40 wk despite the absence of a source of persistent antigen. While DNA vaccination resulted in transfection of a small proportion of dendritic cells only, it led to general activation of all dendritic cells, thus providing optimal conditions for effective T cell activation and maintenance of memory.
Key Words: DNA vaccination dendritic cells cross-presentation T cell memory
Address correspondence to Dr. Brigitta Stockinger, Division of Molecular Immunology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom. Phone: 0181-913-8604; Fax: 0181-913-8531; E-mail: b-stocki{at}nimr.mrc.ac.uk
1 Abbreviations used in this paper: CFSE, carboxyfluorescein diacetate-succinimidylester; CMV, human cytomegalovirus; DC, dendritic cells; GFP, green fluorescent protein; RT, reverse transcriptase.

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