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Updated: Jul 10, 2026
A Convenient and General Expression Platform for the Production of Secreted Proteins from Human Cells
Published on: July 31, 2012
[Expression of human IL-12 in mammalian cell and study on its biological activities]
Hong-Yuan Jiao1, Mei-Yun Zhan, Min-Zhuo Guo
1Institute of Viral Disease Prevention and Control, Chinese Center for Disease Control and Prevention, Beijing, China.
Objective:
To obtain recombinant human interleukin 12 by genetic engineering, and to explore possibility of its clinical application in treatment of tumor and chronic hepatitis.
Methods:
Bicistronic expression vector P35-IRES-P40 was constructed for the simultaneous translation of IL-12 p35 and p40 cDNA subunit through internal ribosomal entry sites (IRES). pCI-dhfr-P35-IRES-P40 vector was constructed for expression in CHO-DHFR- cells. Positively cloned cells were screened by means of ELISA. Pools of clones with increased expression of IL-12 could be generated by selection in methotrexate. To determine the biological activities of rhIL-12, PHA-activated lymphoblasts proliferation assay and IFN-gamma induction assay were used in this study.
Results:
Genetically engineered cells expressing hIl-12 were obtained and all the cell lines showed the stabile expression of rhIL-12 in high efficiency and good growth properties.
Conclusion:
rhIL-12 have good biological activities, it can stimulate activation and proliferation of T cells and induce production of IFN-gamma.
