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Targeting Viral Antigens to CD11c on Dendritic Cells Induces Retrovirus-Specific T Cell Responses

机译:靶向病毒抗原来的CD11c树突状细胞诱导逆转录病毒特异性T细胞应答

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摘要

Dendritic cells (DC) represent the most potent antigen presenting cells and induce efficient cytotoxic T lymphocyte (CTL) responses against viral infections. Targeting antigens (Ag) to receptors on DCs is a promising strategy to enhance antitumor and antiviral immune responses induced by DCs. Here, we investigated the potential of CD11c-specific single-chain fragments (scFv) fused to an immunodominant peptide of Friend retrovirus for induction of virus-specific T cell responses by DCs. In vitro CD11c-specific scFv selectively targeted viral antigens to DCs and thereby significantly improved the activation of virus-specific T cells. In vaccination experiments DCs loaded with viral Ag targeted to CD11c provided improved rejection of FV-derived tumors and efficiently primed virus-specific CTL responses after virus challenge. Since the induction of strong virus-specific T cell responses is critical in viral infections, CD11c targeted protein vaccines might provide means to enhance the cellular immune response to prophylactic or therapeutic levels.
机译:树突状细胞(DC)代表最有效的抗原呈递细胞,可诱导针对病毒感染的有效细胞毒性T淋巴细胞(CTL)反应。将抗原(Ag)靶向DC上的受体是增强DC诱导的抗肿瘤和抗病毒免疫反应的有前途的策略。在这里,我们研究了CD11c特异性单链片段(scFv)与Friend逆转录病毒的免疫优势肽融合的潜能,以诱导DC特异的T细胞应答。体外CD11c特异性scFv将病毒抗原选择性靶向DC,从而显着改善了病毒特异性T细胞的活化。在疫苗接种实验中,载有靶向CD11c的病毒Ag的DC改善了FV衍生肿瘤的排斥,并在病毒攻击后有效引发了病毒特异性CTL反应。由于强烈的病毒特异性T细胞应答的诱导在病毒感染中至关重要,因此CD11c靶向蛋白疫苗可能提供将细胞免疫应答增强至预防或治疗水平的手段。

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