【摘要】 目的　应用二步聚合酶链反应 (PCR)检测皮肤T细胞淋巴瘤 (CTCL)的T细胞受体(TCR)基因重排 ,提高其准确性和特异性 ,并应用已知重排的cDNA序列 ,推测该病患者的特异肽链顺序 ,为免疫治疗提供新线索和途径。方法　先用TCR基因重排区域以外的部分为引物 ,做 1 0～ 30个循环扩增。取得一定数量的cDNA ,作为模板 ,再经 30～ 40个循环扩增 ,获得较纯的cDNA。然后将此产物放入质粒 ,进一步分析DNA序列。按照分析结果 ,制备出特异的分子探针 ,对二步PCR扩增产物进行分子杂交 ,推测出患者的特异性肽链顺序。结果　以Vβ8为特殊引物所显示的反应带明显 ,用Vβ8顺序制成的分子探针杂交 ,示明显的特异性结合。特异性分子探针只与CTCL患者的cDNA杂交 ,与对照组标本不发生交叉反应。结论　二步PCR可准确地检测CTCL的TCR基因重排 ,其特异性强 ,并可在此基础上应用已知重排的cDNA序列推测该病患者的特异性肽链 ,为免疫治疗提供新线索和途径更多还原

【Abstract】 Objective A two step polymerase chain reaction (PCR) strategy was used to amplify copy DNAs corresponding to the special region of the T cell receptor (TCR) β chain. Methods and Results With this technique, a dominant TCR gene rearrangement that used the β8 variable region gene segment was identified in a patient with cuteneous T cell lymphoma and its sequence determined from multiple independently generated subclonal PCR products. An oligonucleotide corresponding to the highly variable junctional region of the clonally expanded TCR gene rearrangement was synthesized and used for further confirming studies. Finally, from the sequence data obtained, a peptide corresponding to the β chain junctional region sequence of the patient′s clonally expanded T cells was generated. Conclusion Preliminary studies using this peptide indicate that it is antigenic and may potentially be useful in developing a patient specific tumour vaccine.更多还原