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Chronic Kidney Disease Elicits an Intestinal Inflammation Resulting in Intestinal Dysmotility Associated with the Activation of Inducible Nitric Oxide Synthesis in Rat

This study was conducted to investigate whether chronic kidney disease (CKD) affects intestinal inflammation and intestinal motility and the underlying mechanisms. Rats were randomized into control group and uremic group. Uremia rats were induced by the 5/6 kidney resection, while the control went through the same procedures but without any kidney resection. Intestinal motility was assessed by charcoal transport assay; intestinal inflammation was assessed by analyses of levels of tumor necrosis factor (TNF)-α, interleukin (IL)-6, and IL-10 in the ileum tissue. The inducible nitric oxide synthesis (iNOS) activity was assessed in the ileum tissue. The results showed that the intestinal motility in uremic group was significantly decreased compared with that in the control group on postoperative weeks 8 and 10. Meanwhile, the uremic group presented significantly higher concentrations of TNF-α, IL-6, and IL-10 than control group on postoperative weeks 8 and/or 10, and higher gene expression on postoperative weeks 6, 8, and 10. Furthermore, the intestinal iNOS activity in the uremic group was significantly increased compared with that in control group on postoperative weeks 8 and 10. These results suggest that CKD could induce intestinal inflammation and lead to intestinal dysmotility, which may be associated with iNOS activation in the intestine.