[Preparation of two mouse anti-human PD-1 monoclonal antibodies and identification of their biological characteristics].

Aim: To prepare mouse anti-human PD-1 monoclonal antibodies (mAbs) and identify their biological characteristics.

Methods: The BALB/c mice were immunized with the transfected cell line PD-1/L929. The cells were fused with Sp2/0 using monoclonal antibody techniques and the positive clones were screened by FCS with PD-1/L929. The secreted anti-PD-1 mAbs were identified through rapid isotyping analysis, karyotype analysis, Western blot, competitive inhibition test, indirect immunofluorescence assay, and tumor cell lines detection.

Results: Two mouse anti-human PD-1 hybridomas were obtained and their secreted mAbs were named (1F2 and 5F10). Their biological characteristics suggested that they could recognize a protein with approximate molecular weight 55 000 on PD-1/L929 cell lines and different epitopes. 1F2 could recognize PD-1 molecules expressed on SKHep-1 and 7721 while 5F10 could recognize Raji cells.

Conclusion: Two mouse anti-human PD-1 hybridoma cell lines and their secreted monoclonal antibodies have been successfully obtained and identified.