【摘要】 目的:研究肿瘤热休克蛋白70(HSP70)多肽复合物修饰树突状细胞激活淋巴细胞治疗胰腺癌的策略和方法。方法:采用低渗裂解,ConA-Sepharose亲和层析柱及ADP-Agarose亲和层析柱,从小鼠胰腺癌(MPC83)瘤块中纯化HSP70多肽复合物;纯化出的70KD蛋白修饰小鼠骨髓来源诱导树突细胞(DC)并制备树突细胞HSP70多肽肿瘤疫苗,MTT法检测修饰后DC增殖活性;用修饰后DC激活小鼠脾淋巴细胞,MTT法检测激活淋巴细胞在不同效靶比下对MPC83的体外杀伤活性。结果:获得较高纯度分子量为70kD左右的蛋白质;50～100ngHSP70多肽复合物可修饰104树突细胞,每克瘤块能获取HSP70多肽复合物约100μg;来自MPC83细胞瘤块HSP70多肽复合物激活的淋巴细胞能特异性杀伤MPC83细胞。结论:采用低压亲和层析柱可从胰腺癌瘤块中获得较高纯度HSP70多肽复合物,HSP多肽复合物DC疫苗用于胰腺癌细胞免疫治疗能获得体外杀伤效果,为临床胰腺癌生物免疫治疗奠定基础。更多还原

【Abstract】 Objective:To investigate the strategies and methods of pancreatic cancer immunotherapy adopt cytotoxic T lymphocytes activated by dendritic cells(DCs),which modified by heat shock protein 70 peptide complex(HSP70-PC).Methods:HSP70 peptide complex from lumps of tumor-bearing mouse innoculated with pancreas cancer cell(MPC83)were purified by ConA-Sepharose and ADP-Agarose affinity chromatography.Dendritic cells derived from normal murine bone marrow were induced by GM-CSF and IL-4.MTT method was applied to analyses the proliferation activities of DCs.To achieve the specific T lymphocyte cells,DCs modified with HSP70 peptide complex were coculture with murine spleen lymphocytes for 48 hours.Then these activated lymphocytes were cocultured with MPC83 at ratio of effect-target 10∶1 and 20∶1 in vitro and the killing activities were detected by MTT method.Results:High purify HSP70-PC was obtained;104 DCs need 50～100ng of HSP70-PC to modify,100μg of HSP70-PC peptide complex can be extracted from per 1g lump;T cells stimulated by HSP70-PC modify DCs showed more specific cytotoxic activity to MPC83 than lymphocytes activated by DCs without HSP70-PC in vitro.Conclusion:We can extract high purity HSP70-PC for clinical individual immunotherapy from pancreatic cancer lump by using hypobaric affinity chromatography;DCs vaccine modified with HSP70-PC has significant kill effect against pancreatic cancer cell in vitro.更多还原