Anticorps CARD11

Involved in the costimulatory signal essential for T-cell receptor (TCR)-mediated T-cell activation. Its binding to DPP4 induces T-cell proliferation and NF-kappa-B activation in a T-cell receptor/CD3-dependent manner. Activates NF-kappa-B via BCL10 and IKK. Stimulates the phosphorylation of BCL10. Also activates the TORC1 signaling pathway.

The protein encoded by this gene belongs to the membrane-associated guanylate kinase (MAGUK) family, a class of proteins that functions as molecular scaffolds for the assembly of multiprotein complexes at specialized regions of the plasma membrane. This protein is also a member of the CARD protein family, which is defined by carrying a characteristic caspase-associated recruitment domain (CARD). This protein has a domain structure similar to that of CARD14 protein. The CARD domains of both proteins have been shown to specifically interact with BCL10, a protein known to function as a positive regulator of cell apoptosis and NF-kappaB activation. When expressed in cells, this protein activated NF-kappaB and induced the phosphorylation of BCL10.

Detected in adult peripheral blood leukocytes, thymus, spleen and liver. Also found in promyelocytic leukemia HL-60 cells, chronic myelogenous leukemia K-562 cells, Burkitt's lymphoma Raji cells and colorectal adenocarcinoma SW480 cells. Not detected in HeLaS3, MOLT-4, A-549 and G431 cells.

B-cell expansion with NFKB and T-cell anergy: An autosomal dominant condition characterized by onset in infancy of splenomegaly and polyclonal expansion of B cells, resulting in peripheral lymphocytosis. Affected individuals also show mild immune dysfunction, including some defective antibody responses and T-cell anergy. There may be a predisposition to the development of B-cell malignancy.

Immunodeficiency 11 A: An autosomal recessive primary immunodeficiency characterized by normal numbers of T and B-lymphocytes, but defective intracellular signaling. There is a block in B-cell differentiation with increased numbers of transitional B-cells and hypogammaglobulinemia, as well as decreased numbers of regulatory T-cells and defects in T-cell function.

Immunodeficiency 11B with atopic dermatitis: An autosomal dominant disorder of immune dysfunction characterized by onset of moderate to severe atopic dermatitis in early childhood. Some patients may have recurrent infections and other variable immune abnormalities. Laboratory studies show defects in T-cell activation, increased IgE, and eosinophilia.

Phosphorylation at Ser-559, Ser-644 and Ser-652 by PRKCB and PRKCQ leads to a shift from an inactive to an active form that activates the NF-kappa-B signaling.

Cytoplasm. Membrane raft.

Colocalized with DPP4 in membrane rafts.