共刺激分子CD28、CD137在喉癌患者T淋巴细胞中的表达及其与细胞免疫功能失调的关系

目的探讨共刺激分子CD28、CD137与喉癌患者细胞免疫功能状况的关系。方法应用梯度离心法分离并纯化外周血和肿瘤浸润淋巴细胞（tumor infiltrating lymphocyte,TIL）,流式细胞术检测喉癌患者外周血T细胞CD8^＋、CD8^＋CD28^＋、CD8^＋CD28^-、CD28^＋细胞亚群分布和双香豆素（phytohemagglutinin,PHA）刺激前后患者外周血T细胞及TIL中CD137的表达。结果喉癌患者CD8^＋T细胞比率为（32.11±5.07）%,CD8^＋CD28^-T细胞比率为（21.03±5.69）%,均明显高于正常对照组（均P〈0.01）;CD28^＋T细胞比率为（45.53±4.51）%,CD8^＋CD28^＋T细胞比率为（12.70±3.41）%,均明显低于正常对照组（P均〈0.01）。CD137^＋T细胞活化增殖能力与CD28的阳性表达呈明显的正相关,喉癌患者外周血T细胞和TIL在未受PHA刺激时CD137^＋T细胞比率分别为（1.90±0.71）%和（3.52±1.64）%,明显高于正常对照组（P均〈0.01）。但经PHA刺激48小时后,外周血和TIL中CD137^＋-48h/CD137^＋-0h值为分11.48±4.03和10.39±3.02,均明显低于正常对照组,P均〈0.01。结论共刺激分子CD28在CD8^＋T细胞亚群中的表达失调使免疫效应性CD137^＋T细胞活化增殖能力下降,是引起喉癌患者细胞免疫功能紊乱的重要原因之一。 还原

Expression of costimulatory molecules CD28 and CD137 on T-lymphocytes and their association with immune dysfunction in patients with laryngeal carcinoma

OBJECTIVE To investigate the expression of costimulatory molecules CD28 and CD137 on T-lymphocytes and their association with immune dysfunction in patients with laryngeal carcinoma. METHODS The T lyphocytes were isolated and purified from peripheral blood cells (PBCs)and tissues of laryngeal carcinoma with density gradient centrifugation methods. The expression of CD8+, CD28+, CD8+CD28+, CD8+CD28- and CD137+ on T-lymphocytes of PBCs and tumor infiltrating lymphocytes(TILs)were detected by direct immunofluo...