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- W1598255417 abstract "Abstract Delayed-type hypersensitivity and allograft rejection are dependent upon the generation of Ag-specific T cell immune responses. The mixed lymphocyte reaction is a model of alloantigen-driven immunity and has provided significant insight into the mechanisms of T cell proliferation. Recently, soluble mediators, including TNF-alpha have been shown to be involved in the full expression of this response. In order to elucidate the potential mechanisms of cellular recruitment in the context of either delayed-type hypersensitivity or allograft rejection, we employed a mixed lymphocyte reaction to study the production of chemokines, monocyte chemoattractant protein-1 (MCP-1), and IL-8. Time-course experiments demonstrated that significant levels of MCP-1 and IL-8 were produced in allogeneic cultures as early as day 1, and that this relationship persisted over 6 days in culture. Northern blot analysis of chemokine mRNA confirmed the early induction of these genes in the allogeneic response. The levels of MCP-1 and IL-8 protein from mixed lymphocyte reaction supernatants as measured by specific ELISA were positively correlated with the proliferative response as measured by [3H]TdR uptake. Although significant MCP-1 and IL-8 were produced during a mixed lymphocyte reaction, these molecules did not participate in the proliferative response, as neutralizing antibodies to either MCP-1 or IL-8 had no effect on proliferation. In order to ascertain the mechanism for the induction of MCP-1 and IL-8 during the mixed lymphocyte reaction, experiments were performed in the presence of neutralizing anti-human TNF antibodies. Neutralization of TNF resulted in significant abrogation of MCP-1 and IL-8 production (75 +/- 5 and 87 +/- 2 percent, respectively). Cells isolated from the mixed lymphocyte reaction at day 6, demonstrated that MCP-1 and IL-8 Ag were localized to mononuclear phagocytes. These results demonstrate that potent chemokines, MCP-1 and IL-8, are produced during the evolution of a mixed lymphocyte reaction, and their induction is TNF-dependent." @default.
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- W1598255417 date "1993-08-01" @default.
- W1598255417 modified "2023-09-29" @default.
- W1598255417 title "Characterization of the production of monocyte chemoattractant protein-1 and IL-8 in an allogeneic immune response." @default.
- W1598255417 doi "https://doi.org/10.4049/jimmunol.151.3.1205" @default.
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