Proteomic profiling of dextran sulfate sodium induced acute ulcerative colitis mice serum exosomes and their immunomodulatory impact on macrophages

Proteomics
Wing-Yan WongWilliam Chi-Shing Tai

Abstract

Macrophages are essential for the maintenance of intestinal homeostasis, and their activation has been proposed to be critical to the pathogenesis of inflammatory bowel disease (IBD). Although there are many recognized mediators of macrophage activation, increasing evidence suggests that macrophages respond to exosome stimulation. Exosomes are 40-150 nm microvesicles released from different cell types and are found in a variety of physiological fluids, including serum. As studies have shown that circulating exosomes participate in intercellular communication and can mediate the immune response, we hypothesized that exosomes may play a role in the pathogenesis of IBD though modulation of macrophage activity. In this study, we used the dextran sulfate sodium (DSS) induced acute colitis mice model to investigate the effect of serum exosomes on macrophages and identify exosome proteins potentially involved in macrophage activation. We treated RAW264.7 macrophages with serum exosomes isolated from dextran sulfate sodium induced mice and found that treatment induced phosphorylation of p38 and ERK and production of tumor necrosis factor α when compared to treatment with exosomes isolated from control mice. Subsequent proteomic analysi...Continue Reading

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