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p-Cresyl sulfate affects the oxidative burst, phagocytosis process, and antigen presentation of monocyte-derived macrophages.
Toxicology Letters 2016 November 31
Immune system dysfunction is a common condition in chronic kidney disease (CKD). The present study investigated the effect of p-Cresyl sulfate (pCS) on human cell line U937 monocyte-derived macrophages (MDM) activity. MDM (1×10(6) cells/mL) were incubated with pCS (10, 25, or 50μg/mL), with or without lipopolysaccharide (LPS; 25ng/mL) and then evaluated NO production, phagocytosis and antigen-presenting molecules expression (HLA-ABC, HLA-DR, CD80 and CD86). All analyses were performed by flow cytometry. All pCS concentrations were able to increase NO production (49±12.1%, 39.8±7.75%, 43.7±11.9%, respectively) compared to untreated cells (4.35±3.34%) after 6h incubation but only the lowest concentration increased this production after 12h (82.9±8.6%, 61±7.2%, 40.8±11.7%). Combined with LPS, the same results were observed. Regarding to phagocytosis, all concentrations were able to induce bead engulfment (35.4±2.71%, 30±3.04%, 23.28±4.58%). In addition, pCS (50μg/mL) was able to increase HLA-ABC and CD80 expression, showed a slight effect on HLA-DR expression and, no difference in basal CD86 levels. pCS can induce an increased oxidative burst and phagocytosis by human macrophages while no modulation of HLA-DR or CD86 expression was induced. Together, these results suggest that pCS induces macrophage activation but interfere in antigen processing, leading to a failure in adaptive immune response in CKD.
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