Serial changes in cytokine expression in irritable bowel syndrome patients following treatment with calcium polycarbophil.

Background/Aims: Calcium polycarbophil improves abdominal symptoms in patients with irritable bowel syndrome (IBS). We examined cytokine expression in IBS patients before and after administration of calcium polycarbophil. Methodology: A total of 24 IBS patients (13 diarrhea type, 11 constipation type; median age, 55 years) were enrolled. Serum levels of high sensitive C-reactive protein (CRP) and 17 cytokines (interleukin [IL]-1 beta, -2, -4, 5, -6, -7, -8, -10, -12, -13 and -17; tumor necrosis factor-alpha [TNF-alpha]; interferon [IFN]-gamma; granulocyte colony-stimulating factor [G-CSF]; granulocyte macrophage colony-stimulating factor [GM-CSF]; macrophage inflammatory protein [MIP]-1 beta; and macrophage chemoattractant protein [MCP-1]) were simultaneously determined using a Bio-Plex suspension array system before and 12 weeks after administration of calcium polycarbophil 1,500-3,000mg/day. Results: Serum MCP-1 levels in diarrhea type IBS patients were significantly higher than those in constipation type patients (p<0.05). In IBS patients, no significant changes in serum cytokine levels were observed following calcium polycarbophil administration. In constipation type patients, serum high sensitive CRP levels were significantly lower after treatment than before treatment. Conclusions: Decreases in serum high sensitive CRP levels following calcium polycarbophil treatment may be involved in the relief of abdominal symptoms in IBS patients; diarrhea type IBS is characterized by increased MCP-1 expression.