Cross-reacting monoclonal antibodies specific for E- and P-selectin
First Claim
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1. A humanized monoclonal antibody having a binding site that specifically binds to P-selectin and to E-selectin comprising a humanized heavy chain and a humanized light chain:
- (1) the humanized light chain comprising three complementarily determining regions (CDR1, CDR2 and CDR3) having amino acid sequences from the mouse antibody light chain and comprising a variable region framework sequence substantially identical to a human light chain variable region framework sequence; and
(2) the humanized heavy chain comprising three complementarily determining regions (CDR1, CDR2 and CDR3 having amino acid sequences from the mouse antibody heavy chain, and comprising a variable region framework sequence substantially identical to a human heavy chain variable region framework sequence;
wherein the humanized antibody specifically binds to the P-selectin with a binding affinity having a lower limit of 107 M-1 ;
wherein the humanized antibody specifically binds to the E-selectin with a binding affinity having a lower limit of 107 M-1 ;
and wherein the specific binding of the antibody to the P-selectin inhibits binding of the P-selectin to a counter-receptor of P-selectin; and
the specific binding of the antibody to the E-selectin inhibits binding of the E-selectin to a counter-receptor of E-selectin.
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Abstract
The invention provides monoclonal antibodies that specifically bind to P-selectin and to E-selectin. Many of the antibodies block the functional interactions of P-selectin and E-selectin with the irrespective counterreceptors.
137 Citations
12 Claims
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1. A humanized monoclonal antibody having a binding site that specifically binds to P-selectin and to E-selectin comprising a humanized heavy chain and a humanized light chain:
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(1) the humanized light chain comprising three complementarily determining regions (CDR1, CDR2 and CDR3) having amino acid sequences from the mouse antibody light chain and comprising a variable region framework sequence substantially identical to a human light chain variable region framework sequence; and (2) the humanized heavy chain comprising three complementarily determining regions (CDR1, CDR2 and CDR3 having amino acid sequences from the mouse antibody heavy chain, and comprising a variable region framework sequence substantially identical to a human heavy chain variable region framework sequence; wherein the humanized antibody specifically binds to the P-selectin with a binding affinity having a lower limit of 107 M-1 ; wherein the humanized antibody specifically binds to the E-selectin with a binding affinity having a lower limit of 107 M-1 ; and wherein the specific binding of the antibody to the P-selectin inhibits binding of the P-selectin to a counter-receptor of P-selectin; and the specific binding of the antibody to the E-selectin inhibits binding of the E-selectin to a counter-receptor of E-selectin. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11)
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5. An antibody made by hybridoma 5C7.29, ATCC accession number CRL 11640.
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12. A method of generating an antibody capable of blocking E-selectin and P-selectin mediated functions, but not L-selectin mediated functions, the method comprising:
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immunizing a mammal with P-selectin; immunizing the mammal with E-selectin; immortalizing B-cells from the mammal to obtain immortalized cells producing antibodies; and selecting an immortalized cell producing an antibody that specifically binds to E-selectin and to P-selectin, but does not specifically bind to L-selectin, and whose specific binding to P-selectin inhibits binding of P-selectin to a counter-receptor of P-selectin; and
whose specific binding of the antibody to E-selectin inhibits binding of E-selectin to a counter-receptor of E-selectin.
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Specification