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KSR1-and ERK-dependent translational regulation of the epithelial-to-mesenchymal transition
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by
Chaitra Rao,
Danielle E Frodyma,
Siddesh Southekal,
Robert A Svoboda,
Adrian R Black,
Chittibabu Guda,
Tomohiro Mizutani,
Hans Clevers,
Keith R Johnson,
Kurt W Fisher,
Robert Lewis
Abstract
The epithelial-to-mesenchymal transition (EMT) is considered a transcriptional process that induces a switch in cells from a polarized state to a migratory phenotype. Here we show that KSR1 and ERK promote EMT-like phenotype through the preferential translation of Epithelial-Stromal Interaction 1 (EPSTI1), which is required to induce the switch from E- to N-cadherin and coordinate migratory and invasive behavior. EPSTI1 is overexpressed in human colorectal cancer (CRC) cells. Disruption of KSR1 or EPSTI1 significantly impairs cell migration and invasion <jats:italic>in </jats:italic>vitro, and reverses EMT-like phenotype, in part, by decreasing the expression of N-cadherin and the transcriptional repressors of E-cadherin expression, ZEB1 and Slug. In CRC cells lacking KSR1, ectopic EPSTI1 expression restored the E- to N-cadherin switch, migration, invasion, and anchorage-independent growth. KSR1-dependent induction of EMT-like phenotype via selective translation of mRNAs reveals its underappreciated role in remodeling the translational landscape of CRC cells to promote their migratory and invasive behavior.
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