par Vandenabeele, P;Abramowicz, Daniel 
;Berus, D;Van der Heyden, J.;Grooten, J;Donckier De Donceel, Vincent ;Peters, Elisabeth ;Goldman, Michel ;Fiers, Walter
Référence The Journal of immunology, 150, 9, page (4179-4187)
Publication Publié, 1993-05
;Berus, D;Van der Heyden, J.;Grooten, J;Donckier De Donceel, Vincent ;Peters, Elisabeth ;Goldman, Michel ;Fiers, WalterRéférence The Journal of immunology, 150, 9, page (4179-4187)
Publication Publié, 1993-05
Article révisé par les pairs
| Résumé : | BALB/c mice neonatally injected with semiallogenic (A/J x BALB/c)F1 splenocytes develop a host-vs-graft (HVG) reaction between host T cells and donor B cells, resulting in hypergammaglobulinemia, splenomegaly, and increased serum levels of various autoantibodies. This syndrome is associated with a polyclonal activation of the donor-derived B cells. High serum levels of IL-6 were found in 4-wk-old mice undergoing HVG disease (mean +/- SEM, 132 +/- 93 as compared with 12 +/- 2 in control mice, p < 0.05). Also supernatants of spleen cell cultures from HVG mice contained increased levels of IL-6. In situ hybridization and cell depletion experiments demonstrated that host macrophages were responsible for this pathologic IL-6 secretion. The spontaneous in vitro production of autoreactive antibodies by donor B cells from HVG mice was further enhanced by adding human rIL-6, whereas addition of human rIL-1 beta, human rIL-2, murine rIL-4, murine rIL-5, or combinations of these cytokines had no effect. Finally, addition of blocking anti-IL-6 and anti-IL-6 receptor mAb markedly reduced hyper IgG1 production in cultures of spleen cells from HVG mice. These data suggest that an increased production of IL-6 by persistently stimulated host macrophages is involved in the activation of donor B cells leading to HVG disease. |
