Establishment of a glycoengineered CHO cell line for enhancing antennary structure and sialylation of CTLA4-Ig
- Authors
- Lim, J.-H.; Kim, J.; Cha, H.-M.; Kang, S.-H.; Han, H.-J.; Ji, M.; Cheon, S.-H.; Kang, M.; Kim, H.H.; Kim, D.-I.
- Issue Date
- Jun-2022
- Publisher
- Elsevier Inc.
- Keywords
- Antennary structure; CHO cell line; CTLA4-Ig; Glycoengineering; Sialylation
- Citation
- Enzyme and Microbial Technology, v.157
- Journal Title
- Enzyme and Microbial Technology
- Volume
- 157
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/55755
- DOI
- 10.1016/j.enzmictec.2022.110007
- ISSN
- 0141-0229
1879-0909
- Abstract
- Cytotoxic T-lymphocyte-associated protein 4-Ig (CTLA4-Ig) produced using Chinese hamster ovary (CHO) cell lines is a fusion protein of CTLA4 and the Fc region of antibody. In the present study, we identified and overexpressed genes capable of increasing sialic acid levels in CTLA4-Ig to develop cell lines using glycoengineering technology. CTLA4-Ig was produced using CHO cells overexpressing N-acetylglucosaminyltransferase (GnT) and α2,6-sialyltransferase (α2,6-ST). The conditions were wild type (WT), overexpression (GnT-IV, GnT-V, and α2,6-ST), and co-overexpression (GnT-IV and α2,6-ST, and GnT-V and α2,6-ST). GnT-IV and GnT-V were transfected into CHO cells to determine tri-antennary structure formation in CTLA4-Ig. CHOGnT-IV (cells overexpressing GnT-IV) showed the highest tri-antennary structures of glycans. Compared to CHOWT, neutral and mono-sialylated glycans decreased (−10.9% and −18.6%, respectively), while bi- and tri-sialylated N-glycans increased (4.1% and 85.7%, respectively) in CHOGnT-IV∙ST (cells co-overexpressing GnT-IV and α2,6-ST). The sum of the relative quantities of neutral N-glycans decreased from 32.0% to 28.5%, while that of sialylated N-glycans increased from 68.0% to 71.5% in CHOGnT-IV∙ST. These results are the first to demonstrate the co-overexpression of especially GnT-IV and α2,6-ST, which is an effective strategy to increase sialic acid levels and the tri-antennary structure of CTLA4-Ig produced using CHO cell lines. © 2022 Elsevier Inc.
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