title: B7-H1 is a ubiquitous antiapoptotic receptor on cancer cells.
abstract: B7-H1 is an immunoglobulin-like immune suppressive molecule broadly detectable on the majority of human and rodent cancers, and its functions have been attributed to delivering an inhibitory signal to its counter-receptor programmed death-1 (PD-1) on T cells. Here we report that B7-H1 on cancer cells receives a signal from PD-1 to rapidly induce resistance against T cell-mediated killing because crippling signaling capacity of B7-H1 but not PD-1 ablates this resistance. Importantly, loss of B7-H1 signaling is accompanied by increased susceptibility to immune-mediated tumoricidal activity. In addition to resistance against T-cell destruction, B7-H1+ cancer cells also become refractory to apoptosis induced by Fas ligation or the protein kinase inhibitor Staurosporine. Our study reveals a new mechanism by which cancer cells use a receptor on immune cells as a ligand to induce resistance to therapy.
authors.affiliation: Department of Dermatology and Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Azuma
authors.forename: Sheng
authors.initials: S
authors.lastname: Yao
authors.forename: Gefeng
authors.initials: G
authors.lastname: Zhu
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Flies
authors.forename: Sarah J
authors.initials: SJ
authors.lastname: Flies
authors.forename: Lieping
authors.initials: L
authors.lastname: Chen
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000276:immunology*; D017209:Apoptosis / Q000187:drug effects / Q000276:immunology*; D051017:Apoptosis Regulatory Proteins / Q000276:immunology*; D018122:B7-1 Antigen / Q000276:immunology*; D060890:B7-H1 Antigen; D045744:Cell Line, Tumor; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D007111:Immunity, Cellular / Q000187:drug effects / Q000276:immunology; D008562:Membrane Glycoproteins / Q000276:immunology*; D051379:Mice; D008811:Mice, Inbred DBA; D009369:Neoplasms / Q000276:immunology* / Q000473:pathology; D010455:Peptides / Q000276:immunology*; D061026:Programmed Cell Death 1 Receptor; D015398:Signal Transduction / Q000187:drug effects / Q000276:immunology*; D019311:Staurosporine / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology* / Q000473:pathology; D019014:fas Receptor / Q000276:immunology
chemical_list: D000954:Antigens, Surface; D051017:Apoptosis Regulatory Proteins; D018122:B7-1 Antigen; D060890:B7-H1 Antigen; C498919:Cd274 protein, mouse; D004791:Enzyme Inhibitors; D008562:Membrane Glycoproteins; C491383:Pdcd1 protein, mouse; D010455:Peptides; D061026:Programmed Cell Death 1 Receptor; D019014:fas Receptor; D019311:Staurosporine