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首页> 外文期刊>Journal of immunotherapy >Enumerating Antigen-Specific T-Cell Responses in Peripheral Blood: A Comparison of Peptide MHC Tetramer, ELISpot, and Intracellular Cytokine Analysis.
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Enumerating Antigen-Specific T-Cell Responses in Peripheral Blood: A Comparison of Peptide MHC Tetramer, ELISpot, and Intracellular Cytokine Analysis.

机译:枚举外周血中的抗原特异性T细胞反应:肽MHC Tetramer,ELISpot和细胞内细胞因子分析的比较。

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摘要

Detection of the circulating antigen-specific T-cell response to immunization is an important biologic end point in clinical trials of cancer vaccines. Typically employed assays are peptide MHC tetramer, ELISpot, and intracellular cytokine analysis. Although there is no agreement on the definition of a positive response in these assays, many groups have chosen a number of T cells greater than 2 standard deviations above the mean of the negative controls. The authors wished to determine how well this cutoff performed for each of these assays in detecting positive and negative T-cell responses to a model antigen, the immunodominant HLA-A*0201-restricted epitope of cytomegalovirus (CMV) pp65. For each assay, the mean + 2 standard deviations of the response for CMV seronegatives was the point that best separated the two groups. Using this value, each assay had a sensitivity of 87.5% and specificity of 95% to 100% and exhibited a high degree of concordance (kappa 0.76-0.9) with the other two. The authors conclude that currently available immunologic assays perform well in detecting biologically relevant levels of antigen-specific T cells. These assays will better define the quantity and quality of protective immune responses to viral disease and offer insight into the requirements for protective anti-cancer immunity.
机译:在免疫疫苗的临床试验中,循环抗原对T细胞免疫应答的检测是重要的生物学终点。通常采用的检测方法是肽MHC四聚体,ELISpot和细胞内细胞因子分析。尽管在这些试验中对阳性反应的定义尚无一致意见,但许多小组选择的T细胞数量大于阴性对照平均值的2个标准差。作者希望确定这些检测方法在检测对模型抗原,免疫显性HLA-A * 0201限制性巨细胞病毒(CMV)pp65抗原表位的阳性和阴性T细胞反应中的表现如何。对于每种测定,CMV血清阴性反应的平均值+ 2标准差是将两组最好分开的点。使用该值,每种测定的灵敏度为87.5%,特异性为95%至100%,并且与其他两种测定的一致性很高(kappa为0.76-0.9)。作者得出的结论是,当前可用的免疫学测定在检测抗原特异性T细胞的生物学相关水平方面表现良好。这些测定将更好地定义针对病毒性疾病的保护性免疫反应的数量和质量,并提供对保护性抗癌免疫性要求的洞察力。

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