Abstract
Despite marked improvements in the success of solid organ transplantation, a significant percentage of transplanted organs is lost due to recurrent episodes of acute cellular rejection. The mechanisms that govern allograft rejection likely include a complex regulatory network of multiple cytokines and growth factors. This study investigated the kidney gene (in situ hybridization) and protein (immunohistochemistry) expression and the urinary excretion rate of IL-6 and EGF in 29 renal transplant recipients: 16 with acute cellular rejection (AR) and 13 with acute tubular damage/cyclosporine toxicity (ATD). AR patients displayed a 4-fold increase of renal IL-6 expression, which localized chiefly to proximal tubular cells and monocytes/macrophages, whereas EGF signal was extremely weak or even absent. In ATD patients, EGF expression was markedly reduced, while IL-6 specific signal was unchanged. In all the patients examined the renal expression of IL-6 and EGF strictly correlated with their urinary excretion rate (r:0.459, P:0.001). Thus, urinary IL-6/EGF ratio was markedly increased in the former group (> 20-fold at day 1), where it paralleled the modifications of plasma creatinine over time (r:0.603, P < 0.0001), and was only slig...Continue Reading
Citations
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