Journal
FREE RADICAL BIOLOGY AND MEDICINE
Volume 131, Issue -, Pages 237-242Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2018.11.037
Keywords
4-hydroxynonenal (4-HNE); Lipid peroxidation, inflammatory bowel disease (IBD); Oxidative stress, Toll-like receptor 4 (TLR4)
Funding
- University of Massachusetts Amherst
- USDA NIFA [2016-67017-24423]
- NSFC [21775119]
- National Natural Science Foundation of China (NSFC) [81702832]
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Human and animal studies have shown that the colonic concentrations of lipid peroxidation products, such as 4-hydroxynonenal (4-HNE), are elevated in inflammatory bowel disease (IBD). However, the actions and mechanisms of these compounds on the development of IBD are unknown. Here, we show that a systemic treatment of low-dose 4-HNE exacerbates dextran sulfate sodium (DSS)-induced IBD in C57BL/6 mice, suggesting its pro-IBD actions in vivo. Treatment with 4-HNE suppressed colonic expressions of tight-junction protein occludin, impaired intestinal barrier function, enhanced translocation of lipopolysaccharide (LPS) and bacterial products from the gut into systemic circulation, leading to increased activation of Toll-like receptor 4 (TLR4) signaling in vivo. Furthermore, 4-HNE failed to promote DSS-induced IBD in Tlr4(-/-) mice, supporting that TLR4 signaling contributes to the pro-IBD effects of 4-HNE. Together, these results suggest that 4-HNE exacerbates the progression of IBD through activation of TLR4 signaling, and therefore could contribute to the pathogenesis of IBD.
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