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Title
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Increased il-6 production and il-6-mediated ig secretion in murine host-vs-graft disease
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Author
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Abstract
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| BALB/c mice neonatally injected with semiallogenic (A/J x BALB/c)Fl 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-1beta, 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. |
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Language
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English
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Source (journal)
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The journal of immunology. - Baltimore, Md
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Publication
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Baltimore, Md
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1993
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ISSN
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0022-1767
[Print]
1550-6606
[Online]
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Volume/pages
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150
:9
(1993)
, p. 4179-4187
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ISI
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A1993KY45200052
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