Antibodies which bind and inhibit blood factor VIII
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 mixture of two or more isolated inhibitory antibodies against factor VIII, said mixture comprising at least one antibody selected from the group consisting of:
(i) an inhibitory antibody against factor VIII, or a fragnment 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 depicted in 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;
(ii) an inhibitory antibody against factor VIII, or a fragnment 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 depicted in SEQ ID NO:33, SEQ ID NO:34, and SEQ ID NO:35, respectively, wherein Asn at position 3 in the CDR1 region of the variable heavy chain is deglycosylated; and
(iii) an inhibitory antibody against factor VIII, or a fragnment thereof, comprising the immunoglobulin variable light chain the 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 the CDR1, CDR2, and CDR3 regions depicted in SEQ ID NO:33, SEQ ID NO:34, and SEQ ID NO:35, respectively, wherein said antibody is produced in CHO cells.
2. The mixture according to claim 1 further comprising an antibody, or a fragment thereof comprising the variable light chain CDRs and the variable heavy chain CDRs, binding to and inhibiting factor VIII, said antibody different from the inhibitory antibodies against factor VIII of (i) to (iii) of claim 1 .
3. The mixture according to claim 1 further comprising an antibody, or a fragment thereof, binding to and inhibiting factor VIII, said antibody 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 depicted in SEQ ID NO:33, SEQ ID NO:34, and SEQ ID NO:35.
4. The mixture according to claim 1 wherein said mutation in the inhibitory antibody against factor VIII of (i) is the change of Asn into Gln, Glu or Asp at position 3 in the CDR1 region of the heavy chain.
5. The mixture according to claim 1 wherein said mutation in the inhibitory antibody against factor VIII of (i) is the change of Thr into Ala at position 5 in the CDR1 region of the heavy chain.
6. The mixture according to claim 1 wherein said mutation in the inhibitory antibody against factor VIII of (i), is the change of Asn into Gln, Glu or Asp at position 3 in the CDR1 region of the heavy chain and the change of Thr into Ala at position 5 in the CDR1 region of the heavy chain.
7. A pharmaceutical composition comprising the mixture according to claim 1 .