Previous studies have demonstrated that mesothelial cells (MC) are important in the local host defense system of the peritoneal cavity. Most studies on the function of MC are performed on MC derived from material of patients with normal renal function (NRF). The aim of the present study was to examine differences in interleukin (IL)-8 expression by MC from patients with NRF and from patients with end-stage renal disease (ESRD). Therefore, MC were isolated from the omentum and pleural exudate of patients with NRF, from spent effluent of stable peritoneal dialysis (PD) patients, and from omentum obtained during catheter implantation prior to PD treatment. MC were stimulated with increasing doses of IL-1 beta or tumor necrosis factor-alpha for 24 hours, after which the supernatant was analyzed for IL-8 content. The IL-8 background level of MC isolated from patients with NRF was significantly lower than the IL-8 background level of MC derived from patients with ESRD. Although IL-8 production appeared to be higher in the ESRD MC, this difference was not significant after stimulation. While the overall immunity is depressed in uremia, MC are activated. The relatively high background of IL-8 might lead to an insensitivity of neutrophils by blocking the receptors and explain their impaired chemotaxis in uremia.
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