title: CD86 (B70/B7-2) on endothelial cells co-stimulates allogeneic CD4+ T cells.
abstract: In vascularized organ transplantation, vascular endothelial cells (EC) confronting recipient T cells are potentially significant APC initiating cellular immune responses that lead to rejection. In the present study, we studied the ability of human EC to stimulate allogeneic T cells and the co-stimulatory molecules involved in this response. On both human umbilical vein endothelial cells (HUVEC) and microvascular endothelial cells (MVEC), MHC class I, intercellular adhesion molecule (ICAM)-1 and CD86 were constitutively expressed as assessed by flow cytometry. After IFN-gamma treatment, MHC class II expression was induced, and MHC class I and ICAM-1 were up-regulated. In contrast, the expression of CD86 was unchanged and CD80 was undetectable even after IFN-gamma treatment. Highly purified CD4+ T cells proliferated in response to IFN-gamma-treated allogeneic HUVEC and MVEC, and this response was efficiently blocked by mAb to MHC class II, ICAM-1 and CD86. Furthermore, the addition of anti-CD86 mAb to the primary culture with allogeneic EC resulted in the induction of alloantigen-specific anergy. These results suggest that CD86 expressed on EC plays a critical role in initiating cellular immune responses to vascularized allografts and would be an important target for immune intervention.
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015703:Antigens, CD / Q000276:immunology / Q000502:physiology*; D051940:B7-2 Antigen; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D015815:Cell Adhesion Molecules / Q000378:metabolism; D017635:Clonal Anergy / Q000276:immunology; D004730:Endothelium, Vascular / Q000737:chemistry / Q000166:cytology / Q000276:immunology*; D006801:Humans; D007519:Isoantigens / Q000235:genetics* / Q000276:immunology; D008213:Lymphocyte Activation; D008285:Major Histocompatibility Complex / Q000276:immunology; D008562:Membrane Glycoproteins / Q000276:immunology / Q000502:physiology*; D012867:Skin / Q000098:blood supply; D014471:Umbilical Veins
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D051940:B7-2 Antigen; C497964:CD86 protein, human; D015815:Cell Adhesion Molecules; D007519:Isoantigens; D008562:Membrane Glycoproteins