PD-L1 Antibody / B7-H1 / CD274

B7 Homolog 1 (B7-H1), also known as CD274 or PD-L1, is a protein that in humans is encoded by the CD274 gene. It is mapped to 9p24.1. B7-H1 is a 40kDa type 1 transmembrane protein that has been speculated to play a major role in suppressing the immune system during particular events such as pregnancy, tissue allografts, autoimmune disease and other disease states such as hepatitis. It has been concluded that upregulation of B7-H1 on tumor MDCs downregulates T-cell immunity and that B7-H1 blockade may represent an approach for cancer immunotherapy. Additionally, B7-H1 can provide positive costimulatory signals for innate and adaptive immunity and for protection against intracellular bacterial infection.