CK-MB特异性单抗的制备方法及其应用

Development and application of CK-MB specific monoclonal antibodies

摘要:

本研究拟建立肌酸激酶同工酶MB (CK-MB) 特异性单克隆抗体 (mAb) 的研制方法，对抗CK-MB单抗进行评价分类及性质鉴定，并初步建立CK-MB定量检测试剂。以CK-MB抗原免疫BALB/c小鼠，利用常规单抗制备技术，使用间接和捕获ELISA差异筛选法筛选单抗。利用肌酸激酶同工酶 (CK-MM/BB/MB) 抗原对所制备单抗的抗原识别表位进行鉴定，另通过免疫印迹法及合成CK-MM、CK-BB差异性的线性表位肽鉴定对所制备的单抗进行评价分类。使用双抗体夹心ELISA方法筛选检测CK-MB抗原的配对mAb，并初步建立CK-MB定量检测试剂。使用74例临床标本初步评价该试剂与罗氏试剂的检测一致性。最终，我们成功筛选到22株稳定分泌抗CK-MB抗体的杂交瘤细胞株，这些单抗可以分为线性、偏构象的CK-MB和CK-MM或者CK-BB交叉的单抗以及与CK-MB特异反应的偏构象型单抗，并使用偏构象型单抗研制出CK-MB定量检测试剂，该试剂与罗氏试剂相关系数r达到0.930 9。综上所述，本研究建立了研制CK-MB偏构象型特异性单抗的筛选方法，通过对所筛选的单抗进行分析鉴定并建立了CK-MB定量检测试剂，与罗氏试剂检测结果符合率高。

Abstract:

The aim of this study is to develop creatine kinase isoenzyme MB (CK-MB) specific monoclonal antibodies (mAb), and characterize the monoclonal antibody and further development of quantitative detection assay for CK-MB. The BALB/c mice were immunized with purchased CK-MB antigen, then monoclonal antibodies were prepared according to conventional hybridoma technique and screened by indirect and capture ELISA method. To identify the epitopes and evaluate the classification, purchased creatine kinase isoenzyme MB (CK-MM/BB/MB) antigen was used to identify the epitopes, with immunoblotting and synthetic CK-MM and CK-BB in different linear epitope. A double antibody sandwich ELISA was applied to screen the mAb pairs for CK-MB detection, and the quantitative detection assay for CK-MB was developed. We used 74 cases of clinical specimens for comparison of our assay with Roche’s CK-MB assay. We successfully developed 22 strains of hybridoms against CK-MB, these mAbs can be divided into linear, partial conformational CK-MB, CK-MM or CK-BB cross monoclonal antibody and CK-MB specific reaction with partial conformational monoclonal antibody, and CK-MB quantitative detection assay was developed by using partial conformational monoclonal antibody. The correlation coefficient factor r of our reagent and Roche’s was 0.930 9. This study established a screening method for CK-MB partial conformational specific monoclonal antibody, and these monoclonal antibodies were analyzed and an established quantitative detection assay was developed. The new assay had a high concordance with Roche’s.