Antibodies and antibody fragments that inhibit the activity of vascular cell adhesion molecule 1 (VCAM1) and/or macrophage erythroblast attacher (MAEA) are provided, along with formulations and kits comprising these antibodies and antibody fragments and the use of the disclosed compositions, formulations, and kits to treat cancers, sickle cell disease, and Polycythemia Vera.

Disclosed is a method for improving affinity of an antibody for an antigen, comprising, in an unmodified antibody, improving affinity for an antigen as compared to the unmodified antibody, by changing 17th, 18th and 20th amino acid residues of a light chain defined by Kabat method to charged amino acid residues.

Antibodies that specifically bind to CD47 and antibodies that specifically bind to PD-L1 are provided, as well as CD47/PD-L1 bispecific antibodies. Also provided are uses of these antibodies, and related compositions and methods.

Provided is an anti-CEA antibody comprising a heavy chain variable region and a light chain variable region, a drug conjugate thereof, and a composition containing the anti-CEA antibody or the drug conjugate thereof, and an application thereof as a drug.

Herein is reported a method for producing a bispecific antibody comprising the step of incubating (i) an antibody Fab fragment or a scFv antibody comprising within the 20 C-terminal amino acid residues the amino acid sequence LPX1TG (SEQ ID NO: 01), (ii) a one-armed antibody comprising a full length antibody heavy chain, a full length antibody light chain, and an Fc-heavy chain, whereby the full length antibody heavy chain and the full length antibody light chain are cognate antibody chains that thereof forms an antigen binding site, whereby the full length antibody heavy chain and the Fc-heavy chain are covalently linked to each other via one or more disulfide bonds forming an antibody hinge region, and whereby the Fc-heavy chain has an oligoglycine amino acid sequence at its N-terminus, and (iii) a Sortase A enzyme.

The present invention provides bispecific antibodies that bind to CD3 and tumor antigens and methods of using the same. According to certain embodiments, the bispecific antibodies of the invention exhibit reduced effector functions and have a unique binding profile with regard to Fcγ receptors. The bispecific antibodies are engineered to efficiently induce T cell-mediated killing of tumor cells. According to certain embodiments, the present invention provides bispecific antigen-binding molecules comprising a first antigen-binding domain that specifically binds human CD3, a second antigen-binding molecule that specifically binds human CD20, and an Fc domain that binds Fcγ receptors with a specific binding pattern. In certain embodiments, the bispecific antigen-binding molecules of the present invention are capable of inhibiting the growth of B-cell or melanoma tumors expressing CD20. The bispecific antibodies of the invention are useful for the treatment of various cancers as well as other CD20-related diseases and disorders.

An objective of the present invention is to provide methods for facilitating antigen-binding molecule-mediated antigen uptake into cells, methods for facilitating the reduction of antigen concentration in plasma, methods for increasing the number of antigens to which a single antigen-binding molecule can bind, methods for improving pharmacokinetics of antigen-binding molecules, antigen-binding molecules improved for facilitated antigen uptake into cells, antigen-binding molecules capable of facilitating the reduction of antigen concentration in plasma, antigen-binding molecules capable of repeatedly binding to antigens, antigen-binding molecules with improved pharmacokinetics, pharmaceutical compositions comprising such an antigen-binding molecule, and methods for producing those described above.

The present inventors discovered that antigen uptake into cells is facilitated by an antibody having human FcRn-binding activity at the plasma pH and a lower antigen-binding activity at the early endosomal pH than at the plasma pH; such antibodies can increase the number of antigens to which a single antibody molecule can bind; the reduction of antigen in plasma can be facilitated by administering such an antibody; and antibody pharmacokinetics can be improved by using such antibodies.

Various bispecific antibodies that specifically bind to both blood coagulation factor IX/activated blood coagulation factor IX and blood coagulation factor X and functionally substitute for the cofactor function of blood coagulation factor VIII, that is, the function to promote activation of blood coagulation factor X by activated blood coagulation factor IX, were produced. From these antibodies, multispecific antigen-binding molecules having a high activity of functionally substituting for blood coagulation factor VIII were successfully discovered.

The present invention relates to trispecific antibodies binding to HER2 and a blood-brain barrier receptor (BBB-R), methods for their production, pharmaceutical compositions containing said antibodies, and uses thereof.

The present invention relates to a novel protein secretion factor, a vector including a nucleic acid sequence encoding the protein secretion factor, and a transformed cell into which the vector is introduced. The invention also relates to a method of producing a target protein using the transformed cell including the vector.