The present invention generally relates to antibodies that bind to CD3, including multispecific antibodies e.g. for activating T cells. In addition, the present invention relates to polynucleotides encoding such antibodies, and vectors and host cells comprising such polynucleotides. The invention further relates to methods for producing the antibodies, and to methods of using them in the treatment of disease.

Provided herein are methods of treating an aging-related disease or condition in a subject in need thereof, killing or reducing the number of senescent cells in a subject in need thereof, improving the texture and/or appearance of skin and/or hair in a subject in need thereof, and assisting in the treatment of obesity in a subject in need thereof, that include administering to the subject a therapeutically effective amount of one or more natural killer (NK) cell activating agent(s) and/or a therapeutically effective number of activated NK cells.

The present application provides a recombinant fusion protein containing an anti-PD-L1 antibody or an antibody fragment thereof, with each paratope of the anti-PD-L1 antibody or antibody fragment thereof linked via a linker to an extracellular Ig-like domain of a signal-regulatory protein (SIRP) at N-terminus of a heavy chain variable region or a light chain variable region constituting the paratope, wherein the recombinant fusion protein can bind to CD47, PD-L1 and FcR simultaneously. The present application also provides a nucleic acid molecule encoding the recombinant fusion protein, an expression vector containing the nucleic acid molecule, a method for producing the recombinant fusion protein and a method for treating a disease associated with over-expression of CD47 and/or PD-L1 using the recombinant fusion protein.

The present invention provides dual specificity antibody fusion proteins comprising an antibody Fab or Fab′ fragment with specificity for an antigen of interest, said fragment being fused to at least one single domain antibody which has specificity for a second antigen of interest.

The present invention comprises human monoclonal antibodies that bind to PD-L1 (also known as programmed death ligand 1 or B7H1). Binding of the invented antibody to PD-L1 inhibits binding to its receptor, PD1 (programmed death 1), and ligand-mediated activities and can be used to treat cancer and chronic viral infections.

The invention provides novel heterodimeric proteins including heterodimeric antibodies.

The present invention provides a polypeptides comprising a heavy chain domain 2 (HD2) from IgM or IgE and at least one pharmaceutically active moiety, complexes thereof and their use for therapy and prophylaxis.

The invention provides heterodimer bispecific antigen-binding molecules that include a first polypeptide that does not include an IgG CH1 domain and a second polypeptide where there is at least one mutation in the IgG CH3 domain that abolishes the ability of the second polypeptide to bind CH3-specific affinity media such that the first and second polypeptides have different affinities with respect to CH1 and CH3 specific affinity reagents that allows rapid isolation by differential binding. The invention also provides bispecific antibodies that have CH1 and CH3 regions with different affinities with respect to affinity reagents that allows rapid isolation by differential binding. The invention also concerns bispecific antibodies which are heterodimers of two IgG heavy chains that differ by at least two amino acids that allow for rapid isolation based on a differential affinity of one mutated heavy chain and a second mutated heavy chain toward two different affinity reagents.

The present invention provides multispecific antibodies, and antigen binding fragments thereof, that potently neutralize a cytokine and that may thus be useful in the prevention and/or treatment of inflammatory and/or autoimmune diseases. In particular, the present invention provides a multispecific antibody, or an antigen binding fragment thereof, comprising at least two different domains specifically binding to at least two different, non-overlapping sites in a cytokine and an Fc moiety. The invention also relates to nucleic acids that encode such antibodies and antibody fragments and immortalized B cells and cultured plasma cells that produce such antibodies and antibody fragments. In addition, the invention relates to the use of the antibodies and antibody fragments of the invention in screening methods as well as in the diagnosis, prophylaxis and treatment of inflammatory and/or autoimmune diseases.

Provided in the present invention is a method for constructing a multispecific antibody. The method comprises the steps of: (i) constructing a first polynucleotide and a second polynucleotide, respectively, wherein the first polynucleotide and the second polynucleotide respectively encode a first polypeptide containing a CL region and a second polypeptide containing a CH1 region, and a disulfide bond may be formed between the CL region of the first polypeptide and the CH1 region of the second polypeptide, such that the antibody has a heterodimeric form; and (ii) expressing the first polynucleotide and the second polynucleotide to obtain the first polypeptide and the second polypeptide, and dimerize the first polypeptide and the second polypeptide to form a multispecific antibody with a heterodimeric form. The antibody of the present invention can simultaneously bind to different targets and maintain the binding activity of the original antibody, which plays a role when the target is a membrane surface receptor or a target in a solution and has a biological activity against multiple targets.