A novel peptide targeting Clec9a on dendritic cell for cancer immunotherapy.

A novel peptide targeting Clec9a on dendritic cell for cancer immunotherapy.
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一种针对树突状细胞上的 Clec9a 的新型肽,用于癌症免疫治疗

DOI:
10.18632/oncotarget.9624
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发表时间:
2016-06-28
期刊:
影响因子:
--
通讯作者:
Qi Y
Qi Y
中科院分区:
其他
文献类型:
--
作者:
Yan Z;Wu Y;Du J;Li G;Wang S;Cao W;Zhou X;Wu C;Zhang D;Jing X;Li Y;Wang H;Gao Y;Qi Y

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树突状细胞(Dendritic cells,DC)是专职的抗原提呈细胞,其表面具有抗原识别分子。Clec 9a选择性表达于小鼠CD 8a + DC和CD 103 + DC亚群,其功能与人BDCA 3 + DC相似。据报道,Clec 9a负责这些DC亚群的抗原交叉呈递。本研究利用噬菌体展示技术,发现了一个新的短肽WH,该短肽能选择性地与Flt 3L诱导的Clec 9a + DCs或Clec 9a过表达的HEK-293 T细胞结合。此外,通过计算机辅助对接模型和突变分析,我们观察到Asp 248和Trp 250是Clec 9a与肽WH结合的两个关键残基。当与OVA 257 -264表位偶联时,WH肽可显著增强Clec 9a + DC激活OVA特异性CD 8 + T细胞的能力,从而诱导分泌IFN-γ、表达穿孔素和颗粒酶B mRNA的能力。在B16-OVA肺转移小鼠模型中,WH-OVA 257 -264融合肽也能增强CD 8 + T细胞的活化,减少肺转移位点。以上结果表明,WH肽可作为一种靶向Clec 9a + DCs的抗原载体,用于肿瘤免疫治疗。
Dendritic cells (DCs) are professional antigen-presenting cells with antigen recognition molecules on the surface. Clec9a is selectively expressed on mouse CD8a+ DCs and CD103+ DCs subsets, which are functionally similar to human BDCA3+ DCs. It is reported that Clec9a is responsible for the antigen cross-presentation of these DC subsets. In the present study, by using phage display technique, we discovered a novel peptide WH, which can selectively bind to mouse Flt3L induced Clec9a+ DCs or Clec9a over-expressed HEK-293T cells. Furthermore, by using computer-aided docking model and mutation assay, we observed that Asp248 and Trp250 are two key residues for Clec9a to bind with peptide WH. When coupled with OVA257-264 epitope, peptide WH can significantly enhance the ability of Clec9a+ DCs to activate OVA-specific CD8+ T cells, which elicit strong ability to secret IFN-γ, express perforin and granzyme B mRNA. In B16-OVA lung metastasis mouse model, WH-OVA257-264 fusion peptide can also enhance the activation of CD8+ T cells and decrease the lung metastasis loci. All these results suggested that peptide WH could be considered as an antigen delivery carrier targeting Clec9a+ DCs for cancer immunotherapy.
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