Abstract |
Recombinant factor IX (rFIX) is increasingly used to treat patients with hemophilia B. CHO (Chinese Hamster Ovary) cells are commonly used for the production of rFIX but they have a limited capacity for introducing post-translational modifications (PTM) leading to incomplete γ-carboxylation, low phosphorylation and sulfation profiles as compared with plasma-derived preparations. Imperfect PTM might have an impact on the activity of Factor IX molecule. Several studies in animal models as well as clinical trials have previously reported a lower recovery of rFIX compared to plasma-derived FIX concentrates. In the present study, we aimed to produce a rFIX having a profile of PTM similar to plasma-derived FIX, using human hepatoma cell line HuH-7. We showed that rFIX produced by HuH-7 cells followed the classical intracellular pathway before secretion. In addition, improved PTM were associated with fully active molecule compared to plasma-derived and recombinant control FIX molecules. Secreted rFIX presented as a single band at the correct molecular weight. HuH-7 cellular clones were obtained and they secreted a biologically active human FIX. FIX was then purified for a detailed evaluation of PTM. Glycosylation and sialylation profiles were similar to plasma-derived and rFIX and mass spectrometry analysis demonstrated the presence of phosphorylated and sulfated forms of rFIX. These data strongly support that HuH-7 cells may represent an effective cellular system for production of rFIX exhibiting PTM similar to plasma-derived FIX.
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Authors | Nathalie Enjolras, Yesim Dargaud, Eloïse Pérot, Florine Guillaume, Michel Becchi, Claude Négrier |
Journal | Thrombosis research
(Thromb Res)
Vol. 130
Issue 5
Pg. e266-73
(Nov 2012)
ISSN: 1879-2472 [Electronic] United States |
PMID | 23021500
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2012 Elsevier Ltd. All rights reserved. |
Chemical References |
- Recombinant Proteins
- Factor IX
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Topics |
- Animals
- CHO Cells
- Cell Line, Tumor
- Cricetinae
- Factor IX
(biosynthesis, genetics, metabolism)
- Glycosylation
- Humans
- Liver Neoplasms
(genetics, metabolism)
- Protein Processing, Post-Translational
- Recombinant Proteins
(biosynthesis, genetics, metabolism)
- Transfection
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