A novel cDNA fragment associated with gastric cancer drug resistance screened from a library by mAb MGr1
- Author:
- No author available
- Journal Title:
- WORLD CHINESE JOURNAL OF DIGESTION
- Issue:
- 8
- DOI:
- 10.3969/j.issn.1009-3079.1998.08.005
- Key Word:
- 胃肿瘤/病理学;肿瘤细胞,培养的;药物筛选试验,抗肿瘤;抗体,单克隆;多药耐药性
Abstract： 目的制备胃癌多药耐药相关性单克隆抗体(mAb),并以该抗体筛选肿瘤耐药细胞表位文库,以获得肿瘤耐药相关的新基因片段.方法采用杂交瘤技术,以胃癌耐药细胞株SGC7901/ VCR为免疫原制备胃癌多药耐药相关性,mAbMGr1,并以MGr1作为探针对肿瘤耐药细胞表位文库反复进行筛选;对稳定阳性重组子所携带的cDNA片段进行正反向测序,并将测序结果输入GeneBank进行同源性分析;原位杂交与Northern blot检测阳性克隆在不同组织细胞中的表达.结果经过21次融合获得了26株培养上清能与SGC7901/ VCR结合的杂交瘤克隆,经免疫组化和单克隆抗体逆转耐药实验发现其中一株mAb在SGC7901/ VCR膜表面及胞内的表达显著高于其相应的药物敏感细胞SGC7901,并能部分逆转SGC7901/ VCR对ADR和5-FU的耐药性. Western blot表明该mAb对应的抗原Mr 800 000～110 000,与Pgp和MRP不同,该株mAb被命名为MGr1. 以MGr1筛选文库,获得了5个能与MGr1抗体结合的携带阳性重组子的菌落,经反复筛选后,证实有一个稳定的阳性克隆;正反向测序结果表明该阳性cDNA片段长度为310 bp,GeneBank检索显示该片段无任何同源性;原位杂交表明该基因在肝、食管、胃、大肠的正常组织均未见表达,Northern blot证实该基因在胃癌细胞SGC7901,胃癌耐药细胞SGC7901/ VCR,食管癌细胞EC109,肝癌细胞HCC7402中均有表达,但在SGC7901/ VCR中的表达量显著高于其他细胞.结论成功地制备了胃癌耐药相关性mAbMGr1. 以MGr1抗体筛选肿瘤耐药细胞表位文库获得了一个与胃癌耐药相关的新基因片段.
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