Gjertsen M K, Saeterdal I, Thorsby E, Gaudernack G
Institute of Transplantation Immunology, National Hospital, University of Oslo, Norway.
Br J Cancer. 1996 Dec;74(11):1828-33. doi: 10.1038/bjc.1996.638.
This is a study of immune responses generated by mutant ras peptide vaccination of patients with pancreatic adenocarcinoma. Responding T cells from one patient were cloned and two CD4+ T-lymphocyte clones (TLC) specific for the 12 Val peptide and restricted by HLA-DR6 or DQ2 were obtained. These class II molecules have not previously been found to bind or present mutant ras peptides to T cells. The DR6-restricted TLC showed marked cytotoxicity against autologous target cells pulsed with the 12 Val peptide. Target cells pulsed with the control peptide were not killed. Responding T cells from another patient showed cross-reactivity towards the homologous ras peptides. Investigation by limiting dilution analysis (LDA) revealed different T-cell precursor frequencies for the immunising, mutant ras peptide (1:28000), compared with the normal ras peptide (1:110000).
这是一项关于胰腺腺癌患者接受突变型ras肽疫苗接种后产生的免疫反应的研究。从一名患者的反应性T细胞中进行克隆,获得了两个针对12缬氨酸肽且受HLA-DR6或DQ2限制的CD4+ T淋巴细胞克隆(TLC)。此前尚未发现这些II类分子能将突变型ras肽结合或呈递给T细胞。受DR6限制的TLC对用12缬氨酸肽脉冲处理的自体靶细胞表现出明显的细胞毒性。用对照肽脉冲处理的靶细胞未被杀死。另一名患者的反应性T细胞对同源ras肽表现出交叉反应性。通过有限稀释分析(LDA)研究发现,与正常ras肽(1:110000)相比,免疫用的突变型ras肽的T细胞前体频率不同(1:28000)。