Journal
JOURNAL OF CELLULAR PHYSIOLOGY
Volume 236, Issue 2, Pages 1083-1093Publisher
WILEY
DOI: 10.1002/jcp.29917
Keywords
cancer; colon; Dab2; E-cadherin; inflammation; junctions
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Funding
- Junta de Andalucia [CTS 5884]
- European Molecular Biology Organization [ASTF45-2012]
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The study shows that Dab2 is crucial for maintaining adherens junctions in the intestine, and its absence may contribute to the development of colon inflammation and cancer.
We reported that Disabled-2 (Dab2) is located at the apical membrane in suckling rat intestine. Here, we discovered that, in colon of suckling and adult mouse and of adult human, Dab2 is only at lateral crypt cell membrane and colocalized with E-cadherin. Dab2 depletion in Caco-2 cells led to E-cadherin internalization indicating that its membrane location requires Dab2. In mice, we found that 3 days of dextran sulfate sodium-induced colitis increased Dab2/E-cadherin colocalization, which was decreased as colitis progressed to 6 and 9 days. In agreement, Dab2/E-cadherin colocalization increased in human mild and severe ulcerative colitis and in polyps, being reduced in colon adenocarcinomas, which even showed epithelial Dab2 absence and E-cadherin delocalization. Epithelial Dab2 decrement preceded that of E-cadherin. We suggest that Dab2 by inhibiting E-cadherin internalization, stabilizes adherens junctions, and its absence from the epithelium may contribute to development of colon inflammation and cancer.
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