摘要
目的设计并利用抗体工程方法构建并制备全新序列的阻断白介素12(IL-12)p40功能的单克隆抗体MAB1,并对其生物学活性进行鉴定,以制备可应用于治疗多种自身免疫病的IL-12通路的阻断剂。方法根据已有的IL-12 p40蛋白序列,设计、构建并制备了全新的单克隆抗体MAB1,利用间接ELISA测定其与抗原结合的亲和力,并用细胞学方法鉴定它的生物学活性。结果抗体MAB1与p40抗原的结合亲和力为0.0399 nmol/L,并能明显抑制IL-12诱导的人皮肤淋巴细胞相关抗原(CLA)水平上调。其抗原结合能力以及抑制IL-12生物学活性能力与美国强生公司抗体药Stelara(ustekinumab)相当或更优。结论全新构建的单克隆抗体MAB1可作为IL-12通路的高亲和力阻断剂,从而成为自身免疫疾病(例如斑块型银屑病)治疗用新药的临床候选药物。
Objective To design and produce a new sequence antibody MAB1 that binds to the p40 subunit of IL12 and blocks IL12 function, for treating autoimmune diseases mediated by IL-12 activity. Methods A monoclonal antibody MAB1 which specifically bond to IL-12 p40 was designed and constructed based on the crystal structure of IL-12 p40. The affinity of MAB1 directed p40 was assessed by indirect ELISA and inhibition of IL-12 induced cutaneous lymphocyte associated antigen （CLA） up-regulation was assessed by FACS analysis. Results In the present study, monoclonal antibody MAB1 was successfully generated. It possessed high binding affinity to p40 and potent inhibitory effect of IL-12 induced CLA up-regulation. These activities were comparible or equivalent to the properties of ustekinumab. Conclusion Monoclonal antibody MAB1 is a high affinity IL-12 antagonist and has potential to be developed for autoimmune diseases such as plaque psoriasis.
出处
《中国医药生物技术》
2014年第4期283-287,共5页
Chinese Medicinal Biotechnology
基金
广东省中山市2012年度创新科研团队项目
