人心肌肌钙蛋白I单克隆抗体的制备及鉴定

Preparation and identification of anti human myocardium troponin I monoclonal antibodies

目的 :制备抗人心肌肌钙蛋白 I(c Tn I)单克隆抗体 (c Tn I Mc Ab)并进行初步鉴定。 方法 :从健康意外死亡者的心肌中提取、纯化人 c Tn I,以其为抗原 ,免疫 BAL B/ c小鼠后 ,取其脾淋巴细胞与小鼠 Sp2 / 0骨髓瘤细胞融合 ,反复筛选及克隆 ,得到能稳定分泌 c Tn I Mc Ab的杂交瘤细胞株。初步鉴定 c Tn I Mc Ab。结果 :经间接 EL l SA法筛选 ,3次克隆化后获得 5株能稳定分泌 c Tn I Mc Ab的杂交瘤细胞 (3A7、3A 11、3D2、3F10和 1H9) ,5株单抗免疫球蛋白亚类鉴定均为 Ig G2 a类。染色体数目 92～ 110条。 5株单克隆抗体腹水按 1∶ 10 0稀释 ,与 L DH、CK、CK- MB、AST和人心肌肌钙蛋白 T(c Tn T)行交叉反应为阴性。 5株 c Tn I Mc Ab腹水效价为 3.2× 10 - 6 ～ 1.6× 10 - 7。c Tn I Mc Ab相加试验表明 ,3D2、3F10与 3A7、3A11、1H9能识别不同的抗原表位。 结论 :本实验成功制备了具有较高活性的 c Tn I Mc Ab,具有良好应用开发价值。

Objective: To prepare monoclonal antibodies (McAb) with cardiac troponin I (cTnI) which was purified from fresh human cardiac muscle within 6 h. Methods: (1) Extraction and purification of human cTnI: cTnI was purified by high salt extraction, saltless precipitation, 65℃ treatment, ammonium sulfate fractionation and DEAE cellulose chromatography, etc . (2) Preparation of anti human cTnI McAb: The purified cTnI was injected into the spleen of BALB/c mice. The cTnI primed spleen cells were fused with Sp2/0 myoloma cell. The McAbs anti human cTnI were obtained by screening with indirect ELISA and 3 times clone. (3)The identification of anti cTnI McAb. Results: Five hybridoma cell lines, named 3A7,3A11,3D2,3F10 and 1H9 were developed, which could secret McAb stably. The 5 McAbs all were demonstrated to be IgG 2a by double gel diffusion test. The number of hybridoma chromosomes was between 92 to 110 and the chromosomes were mainly telocentric. Five kinds of ascites had no cross reaction to LDH,CK,CK MB ,AST and cardiac troponin T(cTnT), and their titers were between 3.2×10 -6 to 1.6×10 -7 . Conclusion: 3D2,3F10 and 3A7,3A11,1H9 react to different epitopes of cTnI. [