Methods for treating or inhibiting thromboembolic disorders or for inhibiting coagulation
The present invention discloses inhibitory antibodies against Factor VIII with modified glycosylation, either by enzymatic deglycosylation or by site directed mutagenesis. Said antibodies with modified glycosylation have equal affinity for FVIII but show different inhibiting properties. The use of one or a mixture of said antibodies allow modulation of the inhibition of factor VIII to levels between 40 and 95%. The present invention further discloses pharmaceutical compositions comprising inhibitory antibodies against Factor VIII with modified glycosylation, combinations of these antibodies and methods for treating haemostasis disorders using said antibodies and antibody mixtures.
1. A method for treatment of a thromboembolic disorder or for inhibition of coagulation, said method comprising administering an effective dose of an inhibitory antibody against Factor VIII or fragment thereof comprising the immunoglobulin variable light chain CDR1, CDR2 and CDR3 regions depicted in SEQ ID NO: 36, SEQ ID NO: 37 and SEQ ID NO: 38 respectively, and comprising the immunoglobulin variable heavy chain CDR1, CDR2 and CDR3 regions with SEQ ID NO: 33, SEQ ID NO: 34 and SEQ ID NO: 35 respectively, wherein the glycosylation site at positions 3 and/or 5 in the CDR1 region of the heavy chain is mutated, or wherein Asn at position 3 in the CDR1 region of the variable heavy chain is deglycosylated, and wherein said administering results in said treatment of said thromboembolic disorder or in said inhibition of coagulation.
2. The method according to claim 1 wherein said mutation of the glycosylation site in the CDR1 region of the heavy chain is the change of Asn into Gln, Glu or Asp at position 3 in said CDR1 region.
3. The method according to claim 1 wherein said mutation of the glycosylation site in the CDR1 region of the heavy chain is the change is the change of Thr into Ala at position 5 in said CDR1 region.
4. The method according to claim 1 wherein said mutation of the glycosylation site in the CDR1 region of the heavy chain is the change of Asn into Gln, Glu or Asp at position 3 and the change of Thr into Ala at position 5 in said CDR1 region.
5. The method according to claim 1 further comprising concomitant administration of a drug(s) inhibiting platelet aggregation.
6. The method according to claim 5 wherein said drug(s) inhibiting platelet aggregation, is(are) selected from the group consisting of aspirin, abciximab or a thrombolytic agent.
7. The method according to claim 6 wherein said thrombolytic agent is selected from the group consisting of tissue plasminogen activator, staphylokinase and microplasmin.
8. The method according to claim 1 , wherein the thromboembolic disorder to be treated is selected from the group consisting of deep vein thrombosis, pulmonary embolism secondary to surgical intervention, chronic hereditary thrombophilia and acquired thrombophilia.
9. The method according to claim 1 , wherein the thromboembolic disorder to be treated is selected from the group consisting of deep vein thrombosis, pulmonary embolism, stroke, atrial fibrillation, non Q wave myocardial infarct, non ST elevated myocardial infarct, unstable angina, sepsis and SIRS.