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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Prediction of an HLA-DR-binding peptide derived from Wilms' tumour 1 protein and demonstration of in vitro immunogenicity of WT1(124-138)-pulsed dendritic cells generated according to an optimised protocol.
Cancer Immunology, Immunotherapy : CII 2002 July
The Wilms' tumour 1 (WT1) protein is over-expressed in several types of cancer including leukaemias and might therefore constitute a novel target for immunotherapy. Recently, human leucocyte antigen (HLA) class I-binding WT1 peptides have been identified and shown to stimulate CD8(+) T cells in vitro. For maximal CD8 cell efficacy, CD4(+) helper T cells responding to major histocompatibility complex (MHC) class II-binding epitopes are required. Here, we report that scanning the WT1 protein sequence using an evidence-based predictive computer algorithm (SYFPEITHI) yielded a peptide WT1(124-138) predicted to bind the HLA-DRB1*0401 molecule with high affinity. Moreover, synthetic WT1(124-138)-peptide-pulsed dendritic cells (DC), generated according to a protocol optimised in the present study, sensitised T cells in vitro to proliferate and secrete interferon-gamma (IFN-gamma) when rechallenged with specific peptide-pulsed DC, but not with peripheral blood mononuclear cells (PBMC). These results suggest that the WT1 protein may yield epitopes immunogenic to CD4 as well as CD8 T cells, and therefore constitute a novel potential target for specific immunotherapy.
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