title: Expression of programmed-death receptor ligands 1 and 2 may contribute to the poor stimulatory potential of murine immature dendritic cells.
abstract: Recent data have revealed that Ag presentation by immature dendritic cells (imDCs) plays a role in establishing and maintaining T-cell tolerance, but the mechanism remains unclear. PD-L1 and PD-L2, ligands for programmed-death receptor 1 (PD-1), members of the expanding B7 family, were highlighted for their inhibitory role in T-cell responses. Here, we show that blockade of PD-1 ligands on imDCs resulted in enhanced T-cell proliferation, which is perhaps due to the enhancement of IL-2 production from DC-stimulated T cells. PD-1 ligands blockade on mDCs did not show a significant stimulatory effect as markedly as imDCs. The inhibitory effects of PD-1 ligands would be dependent on maturation status of DCs, where attenuated positive costimulatory molecules provided the opportunity for PD-1 ligands to exert their strong capacity. Our data are consistent with the hypothesis that imDCs have an inhibitory bias, and indicate that PD-L1 and PD-L2 contribute to the poor stimulatory capacity of imDCs.
authors.affiliation: Clinical Immunology Laboratory of Jiangsu Province, Suzhou University No. 1 Affiliated Hospital, 96 Shizi Street, Suzhou 215006, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Chen
authors.forename: Qiu-Xia
authors.initials: QX
authors.lastname: Qu
authors.forename: Jian-an
authors.initials: JA
authors.lastname: Huang
authors.forename: Yi-Bei
authors.initials: YB
authors.lastname: Zhu
authors.forename: Yan
authors.initials: Y
authors.lastname: Ge
authors.forename: Qin
authors.initials: Q
authors.lastname: Wang
authors.forename: Xue-Guang
authors.initials: XG
authors.lastname: Zhang
mesh_terms: D000818:Animals; D018122:B7-1 Antigen / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D060890:B7-H1 Antigen; D002454:Cell Differentiation / Q000276:immunology; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D005260:Female; D007108:Immune Tolerance; D008024:Ligands; D008213:Lymphocyte Activation / Q000276:immunology; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D010455:Peptides / Q000235:genetics* / Q000378:metabolism / Q000502:physiology; D061027:Programmed Cell Death 1 Ligand 2 Protein; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism
chemical_list: D018122:B7-1 Antigen; D060890:B7-H1 Antigen; C498919:Cd274 protein, mouse; D008024:Ligands; D008562:Membrane Glycoproteins; C556978:Pdcd1lg2 protein, mouse; D010455:Peptides; D061027:Programmed Cell Death 1 Ligand 2 Protein