Stable factor VIII/von willebrand factor complex
There are disclosed a stable factor VIII/vWF-complexes, particularly comprising high-molecular vWF multimers, being free from low-molecular vWF molecules and from proteolytic vWF degradation products, as well as methods of producing these complexes.
1. A method of preparing a stable Factor VIII/von Willebrand Factor (vWF)-complex comprising:
a) subjecting an impure protein solution of Factor VIII or a Factor VIII/vWF-complex to a chromatographic treatment to obtain a purified Factor VIII, a purified high-molecular fraction of vWF molecules, or a purified Factor VIII/vWF-complex; and
b) admixing the purified high-molecular fraction of vWF molecules to the purified Factor VIII or the purified Factor VIII/vWF-complex, thereby preparing a stable Factor VIII/vWF-complex, wherein the stable Factor VII/vWF-complex has a molar ratio of Factor VIII to vWF of between 0.01 and 100, and wherein the high-molecular fraction of vWF molecules has a specific platelet agglutination activity of at least 50 U/mg vWF:Ag.
2. The method according to claim 1 , wherein the molar ratio of Factor VIII to vWF is 0.05 to 1.
3. The method according to claim 1 , wherein the Factor VIII or Factor VIII/vWF-complex is derived from a plasma fraction prior to the chromatographic treatment.
4. The method according to claim 1 , wherein the Factor VIII or Factor VIII/vWF-complex is derived from a cell culture supernatant from transformed cells prior to the chromatographic treatment, wherein the cell culture supernatant is free from cells.
5. The method according to claim 1 , wherein the purified high-molecular fraction of vWF molecules contains plasmatic vWF.
6. The method according to claim 1 , wherein the purified high-molecular fraction of vWF molecules contains recombinant vWF.
7. The method according to claim 1 , wherein the purified high-molecular fraction of vWF molecules has a specific platelet agglutination activity of at least 80 U/mg vWF:Ag.