CD80 (B7-1) and CD86 (B7-2) are ligands of T cell critical costimulatory molecule CD28, and of an inhibitory receptor CTLA-4 (CD152). Both B7 molecules are expressed on professional antigen-presenting cells and are essential for T cell activation, and both molecules can also substitute for each other in this process. CD80 is rapidly induced on the surface of in vitro activated B cells, with Epstein Barr Virus (EBV) transformed B cell lines, with Burkitts lymphoma cell lines, with freshly isolated follicular B lymphoma cells, T cells, and monocytes. The B-lymphocyte activation antigen B7-1 provides regulatory signals for T lymphocytes as a consequence of binding to the CD28 and CTLA4 ligands of T cells. Diseases associated with CD80 dysfunction include gallbladder squamous cell carcinoma and myocarditis.
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Protein Aliases: Activation B7-1 antigen; B-lymphocyte activation antigen B7; B7; BB1; CD80; CD80 antigen (CD28 antigen ligand 1, B7-1 antigen); costimulatory factor CD80; costimulatory molecule variant IgV-CD80; CTLA-4 counter-receptor B7.1; sCD 80; sCD80; soluble CD 80; soluble CD80; T-lymphocyte activation antigen CD80; TS/A-1
Gene Aliases: B7; B7-1; B7.1; BB1; CD28LG; CD28LG1; CD80; LAB7
UniProt ID: (Human) P33681
Entrez Gene ID: (Human) 941
Molecular Function: immunoglobulin receptor superfamily