Identification of new HLA-A*0201-restricted cytotoxic T lymphocyte epitopes from neuritin |
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Authors: | Zhao Yang Tianzhi Zhao Yong Liu Zili Gong Saiyu Cheng Qingwu Yang |
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Institution: | 1. Department of Neurology, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, China 2. Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi’an, 710038, Shanxi, China
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Abstract: | Identification of cytotoxic T lymphocyte (CTL) epitopes from additional tumor antigens is essential for the development of specific immunotherapy of malignant tumors. Neuritin, a recently discovered antigen overexpressed in astrocytoma, is considered to be a promising target for biological therapy. In the present study, we predicted and identified HLA-A2-restricted CTL epitopes from neuritin by using the following four-step procedure: (1) computer-based epitope prediction from the amino acid sequence of neuritin; (2) peptide-binding assay to determine the affinity of the predicted peptide with HLA-A2.1 molecule; (3) stimulation of primary T cell response against the predicted peptides in vitro; and (4) testing of the induced CTLs toward target cells expressing neuritin and HLA-A2.1. The results demonstrated that effectors induced by peptides of neuritin containing residues 13–21, 121–129 and 4–12 could specifically-secrete interferon-γ and lyse target cells. Our results indicate that these peptides are new HLA-A2.1-restricted CTL epitopes, and may serve as valuable tools for astrocytoma immunotherapy. |
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