Schmidt Susanne M, Schag Kerstin, Müller Martin R, Weck Markus M, Appel Silke, Kanz Lothar, Grünebach Frank, Brossart Peter
Department of Hematology, Oncology and Immunology, University of Tübingen, Germany.
Blood. 2003 Jul 15;102(2):571-6. doi: 10.1182/blood-2002-08-2554. Epub 2003 Feb 6.
Survivin, a member of the inhibitor of apoptosis protein family, is expressed in almost all types of malignancies, making this protein a useful tool for the development of broadly applicable vaccination therapies. We used a recently identified HLA-A2 binding peptide and dendritic cells (DCs) from healthy donors to induce survivin-specific cytotoxic T lymphocytes (CTLs) in vitro. These T cells efficiently lysed target cells pulsed with the cognate peptide. Furthermore, survivin-specific CTLs recognized HLA-A2-matched tumor cell lines and primary malignant cells from patients with leukemia in an antigen-specific and HLA-restricted manner as demonstrated with the use of cold target inhibition assays and blocking antibodies. To validate the immunogenicity of survivin we performed the experiments in an autologous setting and used monocyte-derived DCs as targets. Interestingly, we found that DCs up-regulate survivin expression on stimulation with tumor necrosis factor alpha (TNF-alpha). However, these mature DCs were not recognized by survivin-specific CTLs, whereas they lysed autologous mature DCs pulsed with the antigenic peptide or transfected with whole tumor RNA purified from a survivin-expressing cell line. To further analyze the possible use of survivin-specific CTLs in cancer therapies, we induced survivin-specific CTLs using peripheral blood mononuclear cells (PBMNCs) and DCs from a patient with chronic lymphocytic leukemia (CLL). The in vitro-generated T cells efficiently recognized autologous malignant CLL cells, whereas they spared autologous-purified nonmalignant B cells or DCs. Our results demonstrate that survivin epitopes are presented on a broad variety of malignancies and can be applied in vaccination therapies.
生存素是凋亡抑制蛋白家族的成员之一,在几乎所有类型的恶性肿瘤中均有表达,这使得该蛋白成为开发广泛适用的疫苗治疗方法的有用工具。我们使用最近鉴定出的与HLA - A2结合的肽以及来自健康供体的树突状细胞(DC)在体外诱导生存素特异性细胞毒性T淋巴细胞(CTL)。这些T细胞有效地裂解了用同源肽脉冲处理的靶细胞。此外,生存素特异性CTL以抗原特异性和HLA限制性方式识别与HLA - A2匹配的肿瘤细胞系以及白血病患者的原发性恶性细胞,这通过冷靶抑制试验和阻断抗体得以证明。为了验证生存素的免疫原性,我们在自体环境中进行实验,并使用单核细胞衍生的DC作为靶细胞。有趣的是,我们发现DC在受到肿瘤坏死因子α(TNF -α)刺激时会上调生存素的表达。然而,这些成熟的DC未被生存素特异性CTL识别,而它们裂解了用抗原肽脉冲处理或用从表达生存素的细胞系中纯化的全肿瘤RNA转染的自体成熟DC。为了进一步分析生存素特异性CTL在癌症治疗中的可能用途,我们使用慢性淋巴细胞白血病(CLL)患者的外周血单核细胞(PBMNC)和DC诱导生存素特异性CTL。体外产生的T细胞有效地识别自体恶性CLL细胞,而对自体纯化的非恶性B细胞或DC则无损伤。我们的结果表明,生存素表位在多种恶性肿瘤中均有呈现,可应用于疫苗治疗。