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Microtubule-associated protein 1S-related autophagy inhibits apoptosis of intestinal epithelial cells via Wnt/β-catenin signaling in Crohn's disease.
Biochemical and Biophysical Research Communications 2017 April 9
Many autophagy-related genes, to our knowledge, have been identified as Crohn's disease (CD) polymorphic sites by genomic wide studies. As a novel member of the microtubule-associated protein 1 (MAP1) family, MAP1S is a microtubule-binding proteins involved in autophagy. However, its expression and potential functions in CD have not been understood. For the first time, we discovered the up-regulated MAP1S and autophagy level (indicated by LC3-Ⅱ/LC3-Ⅰ) in inflamed epithelium among CD patients. Similarly, in TNBS-induced murine colitis model, MAP1S expression was obviously increased. Meanwhile, we found the co-location of MAP1S and active-caspase 3 which acted as "apoptotic executor" which might indicate the basis of their co-efficient. At the cellular level, MAP1S silencing inhibited starvation-induced over-expression of active-caspase 3 partially via Wnt/β-catenin signaling activation in HCT-116 cells. Finally, we demonstrated that IWP-2, an inhibitor of the Wnt/β-catenin signaling, reversed the down-regulation of active-caspase 3 induced by MAP1S siRNA in HCT-116 cells. Taken together, our results suggested that MAP1S were up-regulated among CD patients and MAP1S-related autophagy inhibits apoptosis of intestinal epithelial cells (IECs) through Wnt/β-catenin signaling pathway which might play a vital role in the protection of intestinal mucosal barrier and inhibition the progression of CD.
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