抗人LSECtin单克隆抗体的制备与初步鉴定

目的:制备抗肝脏、淋巴结窦内皮细胞C型凝集素(LSECtin)单克隆抗体(mAb),并进行特性鉴定。方法:采用原核表达的LSECtin免疫BALB/c小鼠,以间接ELISA法筛选分泌特异性mAb的杂交瘤细胞,采用蛋白印迹、间接免疫荧光、流式细胞术和免疫组化染色法鉴定mAb的特异性。结果:共获得8株可稳定分泌mAb的杂交瘤细胞株。mAb的Ig亚类均为IgG,效价达1∶106~1∶107。这些mAb均可识别转染3T3细胞膜上的人LSECtin,6株mAb可特异识别肝脏窦内皮细胞。结论:成功地制备8株抗LSECtin的mAb,经免疫印迹、流式细胞术和免疫组化染色检测,这些mAb的特异性良好,为研究LSECtin的功能提供了有力的试剂。

Preparation and characterization of monoclonal antibody against human LSECtin

AIM: To prepare and characterize monoclonal antibody (mAb) against human LSECtin (liver and lymph node sinusoidal endothelial cell C-type lectin) protein. METHODS: BALB/c mice were immunized with prokaryotically expressed human LSECtin protein. The splenocytes from the immunized mice were fused with murine myeloma cells (Sp2/0) and then the mAb-positive hybridoma cells were screened by indirect ELISA. Reaction of mAb to LSECtin antigen was characterized by Western blot, indirect immunofluorescent staining, immunohistochemical staining and FCM. RESULTS: Eight hybridoma cells secreting mAbs were established. The isotypes of the mAbs were IgG. Ascites titers were between 1:10(6) - 1:10(7). All the mAbs recognized human LSECtin protein on LSECtin-transfected 3T3 cells and six of the mAbs specifically recognized liver sinusoidal endothelial cells. CONCLUSION: Eight anti-LSECtin mAbs have been obtained. The characterization of the mAbs indicate that they show fine specificity by Western blot, indirect immunofluorescent staining, immunohistochemical staining and FCM, which can provide a powerful reagent for the functional study of LSECtin.