Abstract: An isolated and characterized monoclonal antibody (“440c”) prepared by immunizing Wistar/CRL rats subcutaneously with purified rat bone marrow IPC, fusing popliteal lymph nodes of the rats with SP2/0 myeloma spleen cells and differentially selecting for hybridome supernatants that successfully stain bone marrow derived IPC and fractions thereof using CD11c+ spleen cells and, differentially selecting for hybridoma supernatants from the CD11c+ spleen cells that successfully stain only CD 11 c+/Ly6c+/CD 11 b?/B220+ splenocytes to provide the monoclonal antibody.

Abstract: Novel activating receptors of the Ig super-family expressed on human myeloid cells, called TREM(s) (triggering receptor expressed on myeloid cells) are provided. Specifically, two (2) members of TREMs, TREM-1 and TREM-2 are disclosed. TREM-1 is a transmembrane glycoprotein expressed selectively on blood neutrophils and a subset of monocytes but not on lymphocytes and other cell types and is upregulated by bacterial and fungal products. Use of TREM-1 in treatment and diagnosis of various inflammatory diseases is also provided. TREM-2 is also a transmembrane glycoprotein expressed selectively on mast cells and peripheral dendritic cells (DCs) but not on granulocytes or monocytes. DC stimulation via TREM-2 leads to DC maturation and resistance to apoptosis, and induces strong upregulation of CCR7 and subsequent chemotaxis toward macrophage inflammatory protein 3-?. TREM-2 has utility in modulating host immune responses in various immune disorders, including autoimmune diseases and allergic disorders.

Abstract: Novel activating receptors of the Ig super-family expressed on human myeloid cells, called TREM(s) (triggering receptor expressed on myeloid cells) are provided. Specifically, two (2) members of TREMs, TREM-4 (alpha and beta) and TREM-5 are disclosed. TREM-4 is a transmembrane glycoprotein expressed selectively in the endothelium of capillaries, in the heart and in the testis. Use of TREM-4 in treatment and diagnosis of various inflammatory diseases and heart diseases and male infertility are also provided. TREM-5 is also a transmembrane glycoprotein expressed selectively in bone marrow-derived population of leukocytes, in particular dendritic cells, and may be upregulated in certain conditions, such as cell activation, inflammation or aberrant dendritic cell function. Blockade of TREM-5 with monoclonal antibodies or soluble TREM-5-HuIgG fusion protein may reduce or block skin diseases or dendritic cell associated disorders.

Abstract: Novel activating receptors of the Ig super-family expressed on human myeloid cells, called TREM(s) (triggering receptor expressed on myeloid cells) are provided. Specifically, two (2) members of TREMs, TREM-1 and TREM-2 are disclosed. TREM-1 is a transmembrane glycoprotein expressed selectively on blood neutrophils and a subset of monocytes but not on lymphocytes and other cell types and is upregulated by bacterial and fungal products. Use of TREM-1 in treatment and diagnosis of various inflammatory diseases is also provided. TREM-2 is also a transmembrane glycoprotein expressed selectively on mast cells and peripheral dendritic cells (DCs) but not on granulocytes or monocytes. DC stimulation via TREM-2 leads to DC maturation and resistance to apoptosis, and induces strong upregulation of CCR7 and subsequent chemotaxis toward macrophage inflammatory protein 3-?. TREM-2 has utility in modulating host immune responses in various immune disorders, including autoimmune diseases and allergic disorders.

Abstract: Novel activating receptors of the Ig super-family expressed on human myeloid cells, called TREM(s) (triggering receptor expressed on myeloid cells) are provided. Specifically, two (2) members of TREMs, TREM-1 and TREM-2 are disclosed. TREM-1 is a transmembrane glycoprotein expressed selectively on blood neutrophils and a subset of monocytes but not on lymphocytes and other cell types and is upregulated by bacterial and fungal products. Use of TREM-1 in treatment and diagnosis of various inflammatory diseases is also provided. TREM-2 is also a transmembrane glycoprotein expressed selectively on mast cells and peripheral dendritic cells (DCs) but not on granulocytes or monocytes. DC stimulation via TREM-2 leads to DC maturation and resistance to apoptosis, and induces strong upregulation of CCR7 and subsequent chemotaxis toward macrophage inflammatory protein 3-&bgr;. TREM-2 has utility in modulating host immune responses in various immune disorders, including autoimmune diseases and allergic disorders.