The mouse monoclonal antibody BNI3 recognizes an extracellular domain of human CD152 / CTLA4, an approximately 45 kDa type I transmembrane protein serving as a negative regulator of T cell responses.
Cross-Reactivity (Details)
Human
Purification
Purified by protein-A affinity chromatography.
Purity
> 95 % (by SDS-PAGE)
Endotoxin Level
Endotoxin level is less than 0.01 EU/µg of the protein, as determined by the LAL test.
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Chin, Chu, Chen, Hsu, Weng, Chu: "Site-directed in vitro immunization leads to a complete human monoclonal IgG4 lambda that binds specifically to the CDR2 region of CTLA-4 (CD152) without interfering the engagement of natural ligands." in: BMC biotechnology, Vol. 7, pp. 51, (2007) (PubMed).
Steiner, Moosig, Csernok, Selleng, Gross, Fleischer, Bröker: "Increased expression of CTLA-4 (CD152) by T and B lymphocytes in Wegener's granulomatosis." in: Clinical and experimental immunology, Vol. 126, Issue 1, pp. 143-50, (2001) (PubMed).
Steiner, Waase, Rau, Dietrich, Fleischer, Bröker: "Enhanced expression of CTLA-4 (CD152) on CD4+ T cells in HIV infection." in: Clinical and experimental immunology, Vol. 115, Issue 3, pp. 451-7, (1999) (PubMed).
Target
CTLA4
(Cytotoxic T-Lymphocyte-Associated Protein 4 (CTLA4))
Cytotoxic T-lymphocyte associated protein 4,CD152 / CTLA-4 is a homodimeric transmembrane protein similar to CD28 and binding the same ligands, i.e. CD80 (B7.1) and CD86 (B7.2), but with higher affinity. Unlike CD28 with important costimulating functions, CD152 acts as an important inhibitory receptor essential for modulation of the immune system. CD152 / CTLA-4 becomes transiently expressed on activated T cells and its malfunction can cause autoimmune diseases, such as insulin-dependent diabetes mellitus, Graves disease, Hashimoto thyroiditis, celiac disease, systemic lupus erythematosus, or thyroid-associated orbitopathy.,CTLA4, GSE, GRD4