抗人SOCS3单克隆抗体的制备及其生物学特性鉴定

目的 制备高效价的抗人SOCS3单克隆抗体并对其生物学特性进行鉴定.方法 以重组GST-SOCS3融合蛋白免疫BALB/c小鼠,取其脾细胞与Sp2/0细胞融合,经多次筛选及克隆化,建立可稳定分泌抗SOCS3单克隆抗体的杂交瘤细胞株.用ELISA及Western blot鉴定单克隆抗体的特性,并测定其效价、Ig亚类及相对亲和力.结果 筛选到一株可稳定分泌抗人SOCS3单克隆抗体的杂交瘤细胞株.Western blotting显示在相对分子质量为6.3×104处出现特异性反应带.杂交瘤细胞培养上清效价为1:640,腹水效价为1:25600,Ig亚类为IgG2a,相对亲和力达4.84×106 L/mol.结论 成功制备能特异性识别人SOCS3的单克隆抗体,为进一步研究人体细胞因子信号传导的负反馈调节及SOCS3在微生物感染中的免疫调节作用奠定了基础.

Preparation and characterization of a monoclonal antibody against human SOCS3

OBJECTIVE: To prepare and characterize the monoclonal antibody (mAb) against human SOCS3. METHODS: BALB/c mice were immunized with recombinant GST-SOCS3 protein, from which the spleen cells were isolated and fused with Sp2/0 cells. After several rounds of screening and cloning, the hybridoma cell strain secreting anti-SOCS3 mAb was obtained, whose specificity was evaluated using ELISA and Western blotting, and the titer, immunoglobulin subtype and affinity of the mAb were also measured. RESULTS: The hybridoma cell strain secreting anti-SOCS3 mAb was identified to belong to IgG2a subtype. The mAb titers in cultural supernatant and acetic fluid were 1:640 and 1:25600, respectively, as determined by ELISA with affinity reaching 4.84x10(6) L/mol. CONCLUSION: The success in anti-SOCS3 mAb preparation provides the basis for further study of the negative regulation of cytokine signal transduction and the immunoregulation in microorganism infections.