Abstract:
:We previously demonstrated that cholera toxin (CT) is highly efficient as a combined carrier and adjuvant for dendritic cell (DC) vaccination, inducing strong Th1-dominated B cell and CD4(+) T cell responses. In this study we show that vaccination with DC pre-pulsed ex vivo with CT-conjugated OVA (OVA-CT) gives rise to OVA-specific CD8(+) T cells that produce IFN-gamma and are cytotoxic for OVA-expressing E.G7 tumor cells both in vitro and in vivo. The induction of specific CD8(+) CTL by OVA-CT-treated DC was associated with enhanced presentation of OVA peptide (SIINFEKL) on MHC class I in combination with an overall activation of the pulsed DC. Vaccination of mice with OVA-CT-pulsed DC resulted in rejection of already established MHC class I-positive, MHC class II-negative, OVA-expressing E.G7 tumors in an antigen-specific, CD8(+) T cell-dependent fashion and was associated with high numbers of tumor-infiltrating CD8(+) T cells. Conjugation of antigen to CT facilitated DC uptake of the linked antigen through the GM1 receptor-binding B subunit and induced strong activation-maturation signals through the biologically active A subunit. These results have interesting implications for DC vaccination aimed at inducing CTL immune responses.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Eriksson K,Sun JB,Nordström I,Fredriksson M,Lindblad M,Li BL,Holmgren Jdoi
10.1002/eji.200324368keywords:
subject
Has Abstractpub_date
2004-05-01 00:00:00pages
1272-81issue
5eissn
0014-2980issn
1521-4141journal_volume
34pub_type
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