Provided are monoclonal antibodies that detect CD19 CAR-modified immune cells and CAR-modified immune cells irrespective of the tumor associated antigen they target. Methods of using these functional monoclonal antibodies include, but are not limited to, detection, quantification, activation, and selective propagation of CAR-modified immune cells.

This invention provides, and in certain specific but non-limiting aspects relates to: assays that can be used to predict whether a given ISV will be subject to protein interference as described herein and/or give rise to an (aspecific) signal in such an assay (such as for example in an ADA immunoassay). Such predictive assays could for example be used to test whether a given ISV could have a tendency to give rise to such protein interference and/or such a signal; to select ISV's that are not or less prone to such protein interference or to giving such a signal; as an assay or test that can be used to test whether certain modification(s) to an ISV will (fully or partially) reduce its tendency to give rise to such interference or such a signal; and/or as an assay or test that can be used to guide modification or improvement of an ISV so as to reduce its tendency to give rise to such protein interference or signal; methods for modifying and/or improving ISV's to as to remove or reduce their tendency to give rise to such protein interference or such a signal; modifications that can be introduced into an ISV that remove or reduce its tendency to give rise to such protein interference or such a signal; ISV's that have been specifically selected (for example, using the assay(s) described herein) to have no or low(er)/reduced tendency to give rise to such protein interference or such a signal; modified and/or improved ISV's that have no or a low(er)/reduced tendency to give rise to such protein interference or such a signal.

Provided are monoclonal antibodies that detect CD 19 CAR-modified immune cells and CAR-modified immune cells irrespective of the tumor associated antigen they target. Methods of using these functional monoclonal antibodies include, but are not limited to, detection, quantification, activation, and selective propagation of CAR-modified immune cells.

Disclosed herein is an anti-migis-antibody specific for the migis- of human m chain that can bind to mIgA on B lymphocytes, cause the lysis of mIgA-expressing B lymphocytes, and decrease IgA production by IgA-secreting B lymphocytes. Disclosed further is a pharmaceutical composition comprising the anti-migis- antibody and a pharmaceutically acceptable carrier. Disclosed further is a method for lysing mIgA-expressing B lymphocytes and reducing IgA production in a human subject in vivo by employing an antibody specific for the migis- of human m chain that can bind to mIgA on B lymphocytes, cause the lysis of mIgA-expressing B lymphocytes, and decrease IgA production by IgA-secreting B lymphocytes. Disclosed herein is also a method for treating a disease in a subject, comprising administering to the subject an antibody specific for the migis- of human m chain that can bind to mIgA on B lymphocytes, thereby lysing mIgA-expressing B lymphocytes and reducing IgA production in the immune system of the subject. In addition, Disclosed also is use of said anti-migis- antibody or said fragment thereof for treating a disease in a subject that can benefit from the elimination of mIgA-expressing cells or the reduction of IgA antibodies in the immune system.

The present invention pertains to the field of protein engineering, and provides means for obtaining stable molecules that specifically bind to a target selected amongst a large variety of ligands families. In particular, the present invention provides methods for obtaining a molecule specifically binding to a target of interest, through a combinatorial mutation/selection approach with an OB-fold protein as a starting molecule. In particular, the target of interest can be of a different chemical nature form that of the native target of the OB-fold protein used as the starting molecule.

The present invention relates to a method for manufacturing a transgenic plant producing immunogenic complex proteins and immunogenic complex proteins obtained therefrom and, more specifically, to a method for manufacturing a transgenic plant producing immunogenic complex proteins, a plant manufactured by the method, and immunogenic complex proteins obtained from the plant, wherein the method comprises the steps of: (a) manufacturing a transgenic plant expressing an antigen; (b) manufacturing a transgenic plant expressing an antibody specific to the antigen in step (a); and (c) cross-breeding the plants in steps (a) and (b) to manufacture a cross-bred plant. Immunogenic complex proteins can be mass-produced through the method for manufacturing a transgenic plant, comprising steps (a) to (c), and the transgenic plant manufactured by the method, of the present invention. Further, the immunogenic complex proteins (antigen-antibody complex) obtained from the plant have a gigantic four-dimensional structure, thereby having an excellent immune reaction boosting effect, thus exhibiting an excellent antibody producing capacity in a host animal, even without the use of an immune adjuvant.

The present disclosure provides Siglec ligands that have particular linkers. Also provided are conjugates that include a biologically active substance that is covalently bonded to the connecting group of the Siglec ligands. For instance, the biologically active substance can be a biotherapeutic or an autoantigen. The linkers can have advantageous properties that improve the technical qualities of the corresponding conjugates.

Provided are methods of diagnosing IgA nephropathy in a subject. Optionally, the methods comprise isolating an IgG from the subject and determining whether the IgG binds to a galactose-deficient IgA1. Optionally, the methods comprise providing a biological sample from the subject and detecting in the sample a mutation in a IGH gene, wherein the mutation is in a nucleotide sequence encoding a complementarity determining region 3 (CDR3) of a IGH variable region. Optionally, the methods comprise determining a level of IgG specific for a galactose-deficient IgA1 in the subject. Also provided are methods of treating or reducing the risk of developing IgA nephropathy in a subject.

A platform technology provides particle and nucleic acid conjugates, and compositions thereof, with enhanced targeting to cells, tissues, organs. The particles and nucleic acids and other deliverables contain a synthetic binding protein such as a polypeptide monobody covalently conjugated to the surface of the particle or the nucleic acid, for linking a targeting agent to the particle's surface or the nucleic acid. The particles and nucleic acids and other deliverables optionally contain an antibody non-covalently conjugated to the binding protein, via an Fc domain of the antibody. The particles can include therapeutic agents, diagnostic agents, prophylactic agents, or a combination thereof, to be delivered to desired cells, tissues, and/or organs. The particles and nucleic acids and other deliverables can be used in a wide array of applications including, but not limited to, ex vivo perfusion of mammalian organs and in vivo disease treatment.

The present disclosure is generally directed to compositions that include antibodies, e.g., monoclonal, antibodies, antibody fragments, etc., that specifically bind a SIRPA polypeptide, e.g., a mammalian SIRPA or human SIRPA, and use of such compositions in preventing, reducing risk, or treating an individual in need thereof.