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Optimisation of the Factor VIII yield in mammalian cell cultures by reducing the membrane bound fraction.
MedLine Citation:
PMID:  21219947     Owner:  NLM     Status:  Publisher    
In vivo, clotting Factor VIII (FVIII) circulates in plasma bound to von Willebrand factor (vWF), and the vWF:FVIII complex prevents binding of FVIII to phosphatidylserine (PS). Activation of FVIII by thrombin releases FVIII from vWF, and subsequently FVIII binds to PS exposed on activated platelets and forms the tenase complex together with clotting Factor IX. In vitro, during serum free production of recombinant FVIII (rFVIII), production cells also expose PS, and since vWF is not present to hinder interaction of secreted rFVIII with PS, rFVIII is partly associated with the cell membrane of the production cells. Recently, we showed that as much as 90% of secreted rFVIII is bound to transiently transfected production cells during serum free conditions. In this study, we investigated the effect of including vWF in the serum free medium, and demonstrate that addition of vWF results in release of active membrane bound rFVIII to the culture medium. Moreover, the attachment of rFVIII to cell membranes of un-transfected HEK293 cells was studied in the presence of compounds that competes for interactions between rFVIII and PS. Competitive assays between iodinated rFVIII ((125)I-rFVIII) and annexin V or ortho-phospho-l-serine (OPLS) demonstrated that annexin V and OPLS were able to reduce the membrane bound fraction of rFVIII by 70% and 30%, respectively. Finally, adding OPLS to CHO cells stably expressing FVIII increased the yield by 50%. Using this new knowledge, the recovery of rFVIII could be increased considerably during serum free production of this therapeutic protein.
Mille Petersen Kolind; Peder Lisby Nørby; Martin Werner Berchtold; Laust Bruun Johnsen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-8
Journal Detail:
Title:  Journal of biotechnology     Volume:  -     ISSN:  1873-4863     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-1-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8411927     Medline TA:  J Biotechnol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Biopharmaceuticals Research Unit, Novo Nordisk A/S, Novo Nordisk Park, 2760 Maaloev, Denmark; Cell and Developmental Biology, Department of Biology, University of Copenhagen, Ole Maaloes Vej 5, 2200 Copenhagen N, Denmark.
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