Provided herein are VHH-containing polypeptides that bind OX40. In some embodiments, VHH-containing polypeptides that bind and agonize OX40 are provided. Uses of the VHH-containing polypeptides are also provided.

Provided are an antibody that binds to human PD-L1, and a tetravalent bispecific antibody against PD-1 and PD-L1 constructed based on the antibody that binds to human PD-L1. The tetravalent bispecific antibody requires no Fc modification, has no mismatch problems, and the preparation method thereof is simple. The biological activities and physical and chemical properties of the tetravalent bispecific antibody are similar with or even better than those of the monoclonal antibodies.

The present invention contemplates mRNA, episomal and retroviral genomic gene therapy based short-term, intermediate or long-term vaccine, immunization, protection or therapy—that can also be administered as a retroviral genomic gene therapy—method to provide mucosal and hematological protection to humans to protect against pandemic and non-pandemic viruses, bacterial infections, fungi, allergens or the cause of allergic reactions, systemic pathological conditions, cancer and anti-biowarfare agents (e.g. natural and unnatural viruses and toxins) where mucosal immunity and potentially hematological immunity is achieved through mRNA, episomal or genomic expression of dimeric immunoglobulin A1 (dIgA1) and dimeric immunoglobulin A2 (dIgA2). The present invention provides methods, immunoglobulin compositions and vector constructs to express potent immunoglobulins that are derived from human blood of a human currently infected with, affected by, exposed to or recovered from any of a wide range of allergens or the cause of allergic reactions, pathogens (including, viruses, virus mutants, bacterial infections and fungi) and systemic pathological ailments (including cancer and other disorders), developed from phage display technology or mice or other animals with a humanized immune systems, transgenic mice or chimeric antibodies a fusion of non-human vetebrates (e.g. mouse or rabbit) and human. The immunoglobulin compositions include the heavy chain variable, diversity and joining (VDJ or Variable Heavy Region genes) segment immunoglobulin DNA and/or polypeptide sequence from humans identified to have developed high affinity immunoglobulins against the antigen, protein or proteins of interest and either to use the exact immunoglobulin heavy chain and light chain polypeptide sequences identified from the memory B-cell that produced them or to modify or engineer some of the immunoglobulin heavy chain and light chain constant domains to reduce, change or modulate effector functions. Although, ideally there are no changes made to the immunoglobulins light and heavy chains as identified from the memory B-cell that produced them. Modification may occur at the Hinge region, Constant Heavy 2 (C.sub.H2) domain and Constant Heavy 3 (C.sub.H3) domain for the immunoglobulin heavy chain polypeptide with optional modification or change of Constant Heavy 1 (C.sub.H1), optional modification or change constant light (C.sub.L) chain domain. The resulting antibodies can either be used as a monoclonal or antibody cocktail of (Immunoglobulin Class G subclass1) IgG1, IgG2, IgG3 and other subclasses, IgA1 monomer and IgA2 monomer and dimeric IgA1 (dIgA1) and dimeric IgA2 (dIgA2) immu

The present disclosure relates to antibody molecules comprising a binding domain specific to CD22, said binding domain comprising SEQ ID NO: 1, 2, 3, 4, 5 and 6 or 7. The disclosure also extends to pharmaceutical compositions comprising said antibody molecules and use of the antibody molecules/compositions in treatment.

Provided herein are heterodimeric bispecific antibodies that can mediate cytolysis of a target cell by an immune effector cell, nucleic acids encoding such antibodies, methods of making such antibodies, and methods of using such antibodies. These antibodies comprise two different polypeptide chains, each comprising two immunoglobulin variable regions and, optionally, a half life-extending moiety.

Provided herein are, inter alia, compositions and methods for the treatment of cancer. The compositions include, for example, an antibody variable domain or antibody construct, inter alia, useful for targeting and killing cancer cells. Due to their ability to differentially bind cancer cells versus non-cancer cells, the compositions provided herein may be used, for example, for therapeutic and diagnostic purposes.

This disclosure provides novel broadly neutralizing anti-SARS-CoV-2 antibodies or antigen-binding fragments thereof. The disclosed anti-SARS-CoV-2 antibodies constitute a novel therapeutic strategy in protection from SARS-CoV-2 infections.

Provided herein are biparatopic antigen-binding constructs that specifically bind HER2. The biparatopic antigen-binding constructs comprise one antigen-binding moiety that binds to ECD2 of HER2, a second antigen-binding moiety that binds to ECD4 of HER2, and an Fc. At least one of the antigen-binding moieties is an scFv. The biparatopic antigen-binding constructs can be used in the treatment of cancer.

The present invention generally embraces the treatment of diseases by targeting cells expressing an antigen on the cell surface. In particular the invention relates to recombinant antigen receptors and uses thereof. T cells engineered to express such antigen receptors are useful in the treatment of diseases characterized by expression of one or more antigens bound by the antigen receptors.

The present invention relates to multispecific antibodies, methods for their production, pharmaceutical compositions containing said antibodies and uses thereof.