阳离子交换一步层析法纯化抗gp130单克隆抗体

目的:建立从小鼠腹水中纯化抗gp130单克隆抗体(mAb)B-S12的一步层析方法。方法:小鼠mAb腹水样品经离心后,进行阳离子交换层析柱纯化。检查了上样缓冲液的pH值和洗脱液的离子强度梯度对mAb纯度的影响。纯化后mAb的生物学活性用MTT比色法检测。结果:在pH4.0、20mmol/LHEPES缓冲液条件下上样,用0～1.0mol/L的NaCl梯度洗脱,可获得纯度超过90%的mAbB-S12,回收率为52%。纯化后的mAb对XG-2细胞有明显的促增殖作用。结论:建立的一步纯化方法操作简便,所得mAb的纯度高及生物学活性好。

One-step purification of monoclonal antibody against gp130 by cation exchange liquid chromatography

AIM: To develop a one-step purification method of anti-gp130 monoclonal antibody (mAb) B-S12 from mouse ascites. METHODS: After filtrated by centrifugation, the ascites sample was loaded on a cation exchange column and purified by using ion-strength gradient elution buffer. The effects of pH of the loading buffer and ion strength gradients of the elution buffer on the purity of antibody obtained were investigated. The antibody's biological activity was tested by MTT colorimetry. RESULTS: It was shown that the mAb B-S12 with a purity of over 90% could be achieved by using 20 mmol/L HEPES buffer (pH 4.0) as loading buffer and 0-1.0 mol/L NaCl as elution buffer. The total recovery rate of the mAb was 52%. The purified antibody could stimulate the proliferation of XG-2 cell line. CONCLUSION: The established one-step purification method was simple and suitable for purification of mAb B-S12.