A detailed characterisation of the distribution and presentation of DNA vaccine encoded antigen

Rush, Catherine M., Mitchell, Timothy J., and Garside, Paul (2010) A detailed characterisation of the distribution and presentation of DNA vaccine encoded antigen. Vaccine, 28 (6). pp. 1620-1634.

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The association between plasmid DNA distribution, the amount of Ag produced, Ag persistence and the identity and localisation of cells presenting DNA-encoded Ag all have important consequences for both quantitative and qualitative aspects of T cell responses induced by DNA vaccines. Using a variety of approaches to detect and quantify the uptake of injected DNA, and the production and presentation of DNA-encoded antigen, we report that injected DNA vaccines rapidly enter the peripheral blood from the injection site and also reach muscle-draining lymph nodes directly as free DNA. 24h after plasmid injection, MHCII^(+)CD11b^(+)B220^(-)CD11c^(low/-) cells in the draining and distal LNs and spleen contain pDNA. Interestingly, we also observed pDNA^(+)MHCII^(low/-)CD11b^(+) within the bone marrow. Concomitantly, we detected Ag-containing/expressing cells at both the injection site and in draining lymph nodes. Three days after plasmid injection we detected rare pMHC^(+)CD11c^(+) cells within secondary lymphoid tissue and simultaneously observed Ag-specific CD4^(+) T cell accumulation and blastogenesis in these tissues. Our results show that the events that determine the induction of DNA vaccine immune responses occur within days of DNA injection and that the response becomes systemic very rapidly, possibly with involvement from resident BM cells.

Item ID: 9312
Item Type: Article (Research - C1)
ISSN: 1873-2518
Keywords: vaccination; antigen presentation; T cells
Funders: Wellcome Trust
Date Deposited: 19 May 2011 01:54
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1107 Immunology > 110704 Cellular Immunology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970111 Expanding Knowledge in the Medical and Health Sciences @ 20%
92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920108 Immune System and Allergy @ 80%
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