Abstract: Disclosed is a method for inducing the differentiation of a monocyte into a dendritic cell, the method including the culturing of a monocyte in a medium including GM-CSF, IL-4, and TNF-.alpha..

Abstract: Chimeric peptides or polypeptides that combine ligand binding portions from within the lectin and EGF domains of two different selectins are disclosed. The peptides or polypeptides can be constructed solely of the indicated portions of lectin or EGF domains or they can include portions of any of the remaining domains (SCR, transmembrane or cytoplasmic), or the entire extracellular portion, of a generic selectin molecule. The peptides or polypeptides also can be joined to a carrier protein (e.g., a soluble portion of an immunoglobulin molecule) to increase the serum half-life of the therapeutic agent. The chimeric polypeptides can be used as therapeutic agents to antagonize selectin function. They are also useful for screening for agents that are simultaneously antagonists of the function of lectin and EGF domains of different selectins.

Abstract: Human lymphocyte-associated cell surface protein LAM-1, which includes domains homologous with binding domains of animal lectins, growth factors, and C3/C4 binding proteins, and the cDNA encoding LAM-1, are described. Antagonists to LAM-1 are used in a method of treating a human patient suffering from a lymphocyte-mobilizing condition which involves administering a therapeutic amount of the antagonist in a non-toxic pharmaceutical carrier substance.

Abstract: The invention includes recombinant DNA regulatory elements which control expression of the CD19 gene in a B-lineage-restricted manner.

Abstract: Chimeric peptides or polypeptides that combine ligand binding portions from within the lectin and EGF domains of two different selectins are disclosed. The peptides or polypeptides can be constructed solely of the indicated portions of lectin or EGF domains or they can include portions of any of the remaining domains (SCR, transmembrane or cytoplasmic), or the entire extracellular portion, of a generic selectin molecule. The peptides or polypeptides also can be joined to a carrier protein (e.g., a soluble portion of an immunoglobulin molecule) to increase the serum half-life of the therapeutic agent. The chimeric polypeptides can be used as therapeutic agents to antagonize selectin function. They are also useful for screening for agents that are simultaneously antagonists of the function of lectin and EGF domains of different selectins.

Abstract: Cells expressing Leukocyte Adhesion Molecule-1 (LAM-1) are identified by reaction with an anti-LAM1-3 monoclonal antibody produced by a hybridoma cell line made by the fusion of NS-1 myeloma cells with spleen cells obtained from mice immunized with a LAM-1 cDNA transfected cells. The identification methods are expected to be clinically useful in the diagnosis of disease such as AIDS, which are associated with cells expressing LAM-1 surface protein.

Abstract: A hybridoma cell line produced by the fusion of NS-1 myeloma cells with spleen cells obtained from mice immunized with Leukocyte Adhesion Molecule-1 (LAM-1) cDNA transfected cells. The cell line produces a monoclonal antibody reactive with human, monkey, cow, rabbit, sheep, dog, cat, pig and goat LAM-1. The monoclonal antibody produced by the cell line, anti-LAMl-3, may be clinically useful in blocking leukocyte entry into sites of inflammation or tissue injury.

Abstract: HB15-related lymphocyte activation antigens, and nucleic acid sequences encoding HB15-related antigens are disclosed. Also disclosed are antibodies reactive with HB15.

Abstract: HB15-related lymphocyte activation antigens, and nucleic acid sequences encoding HB15-related antigens are disclosed. Also disclosed are antibodies reactive with HB15.

Abstract: A hybridoma cell line produced by the fusion of NS-1 myeloma cells with spleen cells obtained from mice immunized with Leukocyte Adhesion Molecule-1 (LAM-1) cDNA transfected cells. The cell line produces a monoclonal antibody reactive with human, monkey, cow, rabbit, sheep, dog, cat, pig and goat LAM-1. The monoclonal antibody produced by the cell line, anti-LAM1-3, may be clinically useful in blocking leukocyte entry into sites of inflammation or tissue injury.

Abstract: A shed form of leukocyte adhesion molecule-1 (LAM-1, L-selectin) is present in high levels in human plasma. Quantitative methods of detecting shed LAM-1 (sLAM-1) by Western blot and ELISA analysis are disclosed. Also disclosed are methods for the specific detection of cell-surface bound LAM-1 in the presence of shed LAM-1 and for immunotherapy using monoclonal antibodies reactive with cell-surface bound LAM-1 but not reactive with shed LAM-1.

Abstract: The present invention is concerned with a series of novel monoclonal antibodies directed against CD22, a B lineage-restricted member of the Ig-superfamily which serves as an adhesion receptor expressed by mature B lymphocytes and is believed to function in the regulation of B cell activation. The monoclonal antibodies (mAb) specifically block red blood cell and leukocyte adhesion (80-100%) to COS cells transfected with CD22 cDNA and also identify a region of CD22 distinct from those defined by previously described CD22 mAb. The invention also encompasses therapeutic compositions including therapeutically effective amounts of a polypeptide comprising the CD22 ligand or portion thereof or of a polypeptide comprising the first two amino terminal Ig-like domains of CD22, or the ligand binding portion thereof. The antibodies and polypeptides of the invention find use in therapeutic methods for treatment of humans to retard or block CD22 adhesive function, particularly in autoimmune disease.

Abstract: A shed form of leukocyte adhesion molecule-1 (LAM-1, L-selectin) is present in high levels in human plasma. Quantitative methods of detecting shed LAM-1 (sLAM-1) by Western blot and ELISA analysis are disclosed. Also disclosed are methods for the specific detection of cell-surface bound LAM-1 in the presence of shed LAM-1 and for immunotherapy using monoclonal antibodies reactive with cell-surface bound LAM-1 but not reactive with shed LAM-1.

Abstract: Lymphocyte activation antigen HB15, and the human cDNA and gene sequences encoding HB15, are disclosed. HB15 is not expressed at detectable levels by circulating leukocytes but has a unique pattern of expression among tissues. HB15 is uniquely expressed by Langerhans cells within the skin and other subpopulations of dendritic cells. Also disclosed are antibodies reactive with HB15 and methods of using anti-HB15 antibodies, or other antagonists to HB15 function, to treat an immunological disorder, disease or syndrome.

Abstract: A method of testing the effect of an agonist or an antagonist to B lymphocyte cell surface protein CD20 on B lymphocyte function which involves determining calcium ion flux across the B lymphocyte membrane, contacting the B lymphocyte with the agonist or antagonist, and determining the change in calcium ion flux across the membrane after exposure of the B lymphocyte to the agonist or antagonist, is described. In preferred embodiments of the method the agonist or antagonist is a ligand that binds CD20 or an antibody to CD20.In other preferred embodiments, calcium ion flux is more preferably determined in terms of transmembrane current flow and most preferrably determined in terms of the change in cytosloic CA.sup.2+ concentration.