title: Co-inhibitory role of T-cell-associated B7-H1 and B7-DC in the T-cell immune response.
abstract: B7-H1 and B7-DC expressed on antigen-presenting cells inhibit the T-cell response via the PD-1 counter-receptor on T cells, and co-stimulate T-cell immunity under certain conditions via an unidentified co-stimulatory receptor. However, little is known about the functional consequence of T-cell-associated B7-H1 or B7-DC in the T-cell immune response. Therefore, we evaluated the physiological role of B7-H1 and B7-DC expressed on T cells in terms of cell proliferation and cytokine production by alloreactive T cells. We found that PD-1, B7-H1, and B7-DC were up-regulated in alloreactive CD4(+) and CD8(+) T cells in vitro and in vivo. In the alloreactive T-T model, blockade of the B7-H1:PD-1 or B7-DC:PD-1 pathways significantly increased the proliferation, and IFN-gamma and IL-2 production of alloreactive T cells, although it did not affect the production of other cytokines, including IL-4, IL-10, and IL-12. The data indicate that T-cell-associated B7-H1 and B7-DC negatively regulate the T-cell response via the T-T interaction.
authors.affiliation: Department of Microbiology, Center for Viral Disease Research, Inje University College of Medicine, Busan 614-735, Republic of Korea.
authors.forename: Su-Kil
authors.initials: SK
authors.lastname: Seo
authors.forename: Hyoun-Mi
authors.initials: HM
authors.lastname: Seo
authors.forename: Hye-Young
authors.initials: HY
authors.lastname: Jeong
authors.forename: Il-Whan
authors.initials: IW
authors.lastname: Choi
authors.forename: Yeong-Min
authors.initials: YM
authors.lastname: Park
authors.forename: Hideo
authors.initials: H
authors.lastname: Yagita
authors.forename: Lipieng
authors.initials: L
authors.lastname: Chen
authors.forename: In-Hak
authors.initials: IH
authors.lastname: Choi
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D000954:Antigens, Surface / Q000235:genetics / Q000276:immunology; D018122:B7-1 Antigen / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D060890:B7-H1 Antigen; D049109:Cell Proliferation; D016207:Cytokines / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010455:Peptides / Q000276:immunology* / Q000378:metabolism; D061027:Programmed Cell Death 1 Ligand 2 Protein; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000943:Antigens, Differentiation; D000954:Antigens, Surface; D018122:B7-1 Antigen; D060890:B7-H1 Antigen; C498919:Cd274 protein, mouse; D016207:Cytokines; D008562:Membrane Glycoproteins; C556978:Pdcd1lg2 protein, mouse; D010455:Peptides; D061027:Programmed Cell Death 1 Ligand 2 Protein