title: Efficient production of FAM19A4, a novel potential cytokine, in a stable optimized CHO-S cell system.
abstract: FAM19A4 is a novel potential cytokine identified by our group, which can chemoattract macrophages, promote phagocytosis against zymosan and increase reactive oxygen species (ROS) release. To further explore the role of FAM19A4 in immune system, abundant recombinant protein with high quality is indispensable. For efficient production of FAM19A4, we used an improved CHO-S cell expression system on the basis of pMH3 vector containing GC-rich regions which were novel ubiquitous chromatin opening elements (UCOEs). We selected CHO-S cells stably expressing FAM19A4 with G418 and screened cell clones with high level of FAM19A4 expression by immune blot and his-ELISA, adapted cell clones to serum-free suspension culture. Afterwards, we obtained the highest FAM19A4 expressing cell clone (2#) through 40 ml batch culture. We optimized the fed-batch culture condition and discovered the final cell viability was critical for FAM19A4 production successfully. Then we scaled 2# clone up to 3 L in fed-batch culture and obtained 22 mg (7.33 mg/L, averagely) endotoxin free FAM19A4 protein with purity over 95% using Ni affinity chromatography and size exclusion chromatography. The final yield was increased 3.6-folds compared to that of our previously reported transient system. Besides, the purified FAM19A4 protein showed chemotactic activity on macrophages. In summary, we developed a stable optimized fed-batch CHO-S cell system to produce FAM19A4, which not only provided sufficient bioactive FAM19A4 protein for further research but also offered an efficient strategy for other recombinant protein production.
authors.affiliation: Department of Immunology, School of Basic Medical Sciences, Peking University Health Science Center, Key Laboratory of Medical Immunology, Ministry of Health, Beijing, China; Peking University Center for Human Disease Genomics, Peking University Health Science Center, Beijing, China.
authors.forename: Huihui
authors.initials: H
authors.lastname: Liu
authors.affiliation: Department of Immunology, School of Basic Medical Sciences, Peking University Health Science Center, Key Laboratory of Medical Immunology, Ministry of Health, Beijing, China; Peking University Center for Human Disease Genomics, Peking University Health Science Center, Beijing, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.affiliation: Peking University Center for Human Disease Genomics, Peking University Health Science Center, Beijing, China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Shi
authors.affiliation: Department of Immunology, School of Basic Medical Sciences, Peking University Health Science Center, Key Laboratory of Medical Immunology, Ministry of Health, Beijing, China; Peking University Center for Human Disease Genomics, Peking University Health Science Center, Beijing, China.
authors.forename: Yingyu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Immunology, School of Basic Medical Sciences, Peking University Health Science Center, Key Laboratory of Medical Immunology, Ministry of Health, Beijing, China; Peking University Center for Human Disease Genomics, Peking University Health Science Center, Beijing, China. Electronic address: hanwl@bjmu.edu.cn.
authors.forename: Wenling
authors.initials: W
authors.lastname: Han
mesh_terms: D000818:Animals; D019149:Bioreactors; D016466:CHO Cells; D019742:Chemokines, CC / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology; D002633:Chemotaxis / Q000187:drug effects; D002853:Chromatography, Liquid; D006224:Cricetinae; D003412:Cricetulus; D005822:Genetic Vectors; D006801:Humans; D017737:Macrophages, Peritoneal; D009000:Monocytes; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D019742:Chemokines, CC; D011994:Recombinant Proteins
keywords: CHO-S cell; Cytokine; FAM19A4; Fed-batch culture; Optimized culture condition; UCOE