Abstract
Although allograft rejection, the major complication of human organ transplantation, has been extensively studied, little is known about the exact cellular localization of the cytokine expression inside the graft during rejection. Therefore, we used in situ hybridization and immunohistochemistry to study local cytokine mRNA and protein expression in human heart allografts, in relation to the phenotypical characteristics of the cellular infiltrate. Clear expression of mRNA for interleukin (IL)-6, IL-8, IL-9, and IL-10 and weak expression for IL-2, IL-4, IL-5, and tumor necrosis factor (TNF)-alpha was detected in biopsies exhibiting high rejection grades (grade 3A/B). Also at lower grades of rejection, mRNA for IL-6 and IL-9 was present. Some mRNA for IL-1 beta, TNF-beta, and interferon (IFN)-gamma was detected in only a few biopsies. Using immunohistochemistry, IL-2, IL-3, and IL-10 protein was detected in biopsies with high rejection grades, whereas few cells expressed IL-6, IL-8, and IFN-gamma. In biopsies with lower grades of rejection, a weaker expression of these cytokines was observed. IL-4 was hardly detected in any of the biopsies. The level of IL-12 expression was equal in all biopsies. Although mRNA expression of several cytokines was expressed at a low level compared with the protein level of those cytokines, there was a good correlation between localization of cytokine mRNA and protein. Expression of IL-2, IL-4, IL-5, TNF-alpha, and IFN-gamma was mainly detected in lymphocytes. IL-3, IL-6, IL-10, and IL-12 were not detected or not only detected in lymphocytes but also in other stromal elements (eg, macrophages). Macrophage production of IL-3 and IL-12 was confirmed by immunofluorescent double labeling with CD68. We conclude that cardiac allograft rejection is not simply regulated by T helper cell cytokine production, but other intragraft elements contribute considerably to this process.
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