title: Immunosuppressive properties of CD95L-transduced "killer" hybrids created by fusing donor- and recipient-derived dendritic cells.
abstract: Allogeneic immune responses, which are initiated by dendritic cells (DCs) of both donor and host origins, remain a major obstacle in organ transplantation. Presentation of intact major histocompatibility complex (MHC) molecules by allogeneic DCs and allogeneic peptides by syngeneic DCs leads to complex allogeneic immune responses. This study reports a novel strategy designed to suppress both pathways. A stable DC line XS106 (A/J mouse origin) was transfected with CD95L cDNA and fused with splenic DCs purified from allogeneic BALB/c mice. The resulting "killer" DC-DC hybrids: (1) expressed CD95L and MHC class I and class II molecules of both A/J and BALB/c origins, while maintaining otherwise characteristic surface phenotypes of mature DCs; (2) inhibited MHC class I- and class II-restricted mixed leukocyte reactions between the parental strains by triggering apoptosis of alloreactive T cells; and (3) abolished delayed-type hypersensitivity responses of A/J (and BALB/c) mice to BALB/c-associated (and A/J-associated) alloantigens when injected intravenously into A/J (and BALB/c) mice. The onset of graft-versus-host disease in (BALB/c x A/J) F1 hosts receiving A/J-derived hematopoietic cell transplantation was suppressed significantly (P <.001) by killer DC-DC hybrid treatment. These results form both technical and conceptual frameworks for clinical applications of CD95L-transduced killer hybrids created between donor DCs and recipient DCs in the prevention of allogeneic immune responses following organ transplantation.
authors.affiliation: Department of Dermatology, University of Texas Southwestern Medical Center, Dallas 75390-6069, USA. hiroyuki.matsue@utsouthwestern.edu
authors.forename: H
authors.initials: H
authors.lastname: Matsue
authors.forename: K
authors.initials: K
authors.lastname: Matsue
authors.forename: M
authors.initials: M
authors.lastname: Kusuhara
authors.forename: T
authors.initials: T
authors.lastname: Kumamoto
authors.forename: K
authors.initials: K
authors.lastname: Okumura
authors.forename: H
authors.initials: H
authors.lastname: Yagita
authors.forename: A
authors.initials: A
authors.lastname: Takashima
mesh_terms: D000818:Animals; D017209:Apoptosis; D002459:Cell Fusion; D002460:Cell Line; D003713:Dendritic Cells / Q000276:immunology*; D053222:Fas Ligand Protein; D005260:Female; D015870:Gene Expression; D015395:Histocompatibility Antigens Class I / Q000235:genetics; D000949:Histocompatibility Antigens Class II / Q000235:genetics; D006968:Hypersensitivity, Delayed; D007108:Immune Tolerance; D007519:Isoantigens / Q000276:immunology; D007700:Kinetics; D007959:Lymphocyte Culture Test, Mixed; D008562:Membrane Glycoproteins / Q000235:genetics*; D051379:Mice; D008805:Mice, Inbred A; D008807:Mice, Inbred BALB C; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology; D014162:Transfection
chemical_list: D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D007519:Isoantigens; D008562:Membrane Glycoproteins