title: Direct antigen presentation through binding of donor intercellular adhesion molecule-1 to recipient lymphocyte function-associated antigen-1 molecules in xenograft rejection.
abstract: Cellular interactions that lead to graft rejection were examined in a rat-to-mouse xenogeneic combination using species-specific monoclonal antibodies (mAbs) against donor and recipient intercellular adhesion molecule-1 (ICAM-1) and lymphocyte function-associated antigen-1 (LFA-1) molecules, respectively. Although both mAbs displayed moderate blocking activity in an in vitro mixed lymphocyte response assay, strong suppression was observed when anti-donor (rat) ICAM-1 mAb was combined with anti-recipient (mouse) LFA-1 mAb. Likewise, significant prolongation of islet xenograft survival was observed with these mAbs. Thus, 0.05 mg of anti-mouse LFA-1 mAb and anti-rat ICAM-1 mAb given on days 0 and 1 produced significant prolongation of graft survival over the control (51+/-20 days vs. 10+/-3 days, P<0.0001), but not when anti-mouse ICAM-1 mAb was combined with anti-mouse LFA-1 mAb (13+/-3 days). In this species combination, mouse T cells were able to proliferate in the presence of rat antigen-presenting cells (APCs) in a cell number-dependent manner, but not in the presence of mouse APCs. The binding assay showed that LFA-1 molecules on mouse T cells can bind immobilized rat ICAM-1 molecules. These results suggest that rat ICAM-1 molecules on APCs can interact with mouse LFA-1 molecules on T cells across a species barrier and that this binding generates the consequent immune responses leading to rejection. mAb treatment against these adhesion molecules of recipient as well as donor is crucial for preventing rejection in a xenogeneic transplantation model.
authors.affiliation: Department of Surgery II, Osaka University Medical School, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ohta
authors.forename: M
authors.initials: M
authors.lastname: Gotoh
authors.forename: H
authors.initials: H
authors.lastname: Ohzato
authors.forename: T
authors.initials: T
authors.lastname: Fukuzaki
authors.forename: M
authors.initials: M
authors.lastname: Nishihara
authors.forename: K
authors.initials: K
authors.lastname: Dono
authors.forename: K
authors.initials: K
authors.lastname: Umeshita
authors.forename: M
authors.initials: M
authors.lastname: Sakon
authors.forename: H
authors.initials: H
authors.lastname: Yagita
authors.forename: K
authors.initials: K
authors.lastname: Okumura
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: H
authors.initials: H
authors.lastname: Kawashima
authors.forename: M
authors.initials: M
authors.lastname: Miyasaka
authors.forename: M
authors.initials: M
authors.lastname: Monden
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D000938:Antigen-Presenting Cells / Q000276:immunology*; D006084:Graft Rejection / Q000276:immunology*; D006085:Graft Survival / Q000276:immunology; D018799:Intercellular Adhesion Molecule-1 / Q000276:immunology / Q000302:isolation & purification / Q000502:physiology*; D016381:Islets of Langerhans Transplantation / Q000276:immunology*; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D016169:Lymphocyte Function-Associated Antigen-1 / Q000276:immunology / Q000502:physiology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D051381:Rats; D017208:Rats, Wistar; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors; D014183:Transplantation, Heterologous / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D016169:Lymphocyte Function-Associated Antigen-1; D018799:Intercellular Adhesion Molecule-1