title: Normal IgG protects against acute graft-versus-host disease by targeting CD4(+)CD134(+) donor alloreactive T cells.
abstract: Intravenous immunoglobulin (IVIg) was shown to decrease the severity of acute graft-versus-host disease (aGVHD) in recipients of allogeneic bone marrow transplants. To investigate the mechanisms involved in the protective effect of IVIg, we have used the parent-into-F1 model in which parental lymphocytes are transferred into semi-syngeneic non-irradiated F1 rats. Here we report that IVIg, as well as F(ab')(2) fragments of IVIg, protected (Lewis x Brown-Norway) F1 rats against aGVHD induced by a single injection of Lewis lymphocytes. IVIg was given as five consecutive daily injections, starting on the day preceding that of the transfer of Lewis cells. Protection was associated with a decreased ability of lymphocytes to spontaneously proliferate and to produce NO and IFN-gamma, in the absence of an increased production of IL-10. We further demonstrate that protection was associated with a decrease in CD4(+) T cells bearing the activation marker CD134 in vivo, and with an enhanced apoptosis of activated CD4(+) T cells by IVIg, in vitro. Our observations suggest that the prevention of aGVHD by IVIg in this model is mediated by the induction of apoptosis of activated alloreactive CD4(+)CD134(+) donor T cells. The results further emphasize the role of normal immunoglobulin in modulating alloantigen immune responsiveness.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale (INSERM) U 430, Paris, France.
authors.forename: L
authors.initials: L
authors.lastname: Caccavelli
authors.forename: A C
authors.initials: AC
authors.lastname: Field
authors.forename: V
authors.initials: V
authors.lastname: Betin
authors.forename: L
authors.initials: L
authors.lastname: Dreillard
authors.forename: M F
authors.initials: MF
authors.lastname: Belair
authors.forename: M F
authors.initials: MF
authors.lastname: Bloch
authors.forename: P
authors.initials: P
authors.lastname: Bruneval
authors.forename: M
authors.initials: M
authors.lastname: Kazatchkine
authors.forename: B
authors.initials: B
authors.lastname: Bellon
mesh_terms: D000208:Acute Disease; D000818:Animals; D017209:Apoptosis; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000637:transplantation; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis; D006086:Graft vs Host Disease / Q000276:immunology* / Q000473:pathology / Q000628:therapy; D007140:Immunoglobulin Fab Fragments / Q000494:pharmacology; D007074:Immunoglobulin G / Q000494:pharmacology; D016756:Immunoglobulins, Intravenous / Q000494:pharmacology*; D007519:Isoantigens / Q000276:immunology*; D051381:Rats; D011917:Rats, Inbred Lew; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000032:analysis*
chemical_list: D016207:Cytokines; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D016756:Immunoglobulins, Intravenous; D007519:Isoantigens; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; C505718:Tnfrsf4 protein, rat; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7