Loss of Neogenin1 in human colorectal carcinoma cells causes a partial EMT and wound-healing response

Sci Rep. 2019 Mar 11;9(1):4110. doi: 10.1038/s41598-019-40886-y.

Abstract

Neogenin1 (NEO1) is a receptor of the Deleted in Colorectal Carcinoma (DCC)/Frazzled/UNC-40 family, which regulates axon guidance but can also stabilize epithelial adherens junctions. NEO1 and DCC are also tumor suppressors that can inhibit metastasis by acting as dependence receptors. Given the role of NEO1 in maintaining adherens junctions we tested whether loss of NEO1 also promoted metastasis via an epithelial mesenchymal transition (EMT). Loss of NEO1 disrupted zonula adherens but tight junctions were unaffected. Neo1-depleted epithelial cells exhibited a more migratory morphology, had reduced F-actin rich stress-fibres and more basal lamellipodia. Microtubule density was decreased while microtubule outgrowth was faster. Live imaging showed that Neo1-depleted epithelial islands had increased lateral movement. Western blots and immunostaining revealed increased expression of mesenchymal markers such as Fibronectin and MMP1. Furthermore, RNA-seq analysis showed a striking decrease in expression of genes associated with oxidative phosphorylation, and increased expression of genes associated with EMT, locomotion, and wound-healing. In summary, loss of NEO1 in intestinal epithelial cells produces a partial EMT response, based on gene expression, cellular morphology and behaviour and cytoskeletal distribution. These results suggest that loss of NEO1 in carcinomas may contribute to metastasis by promoting a partial EMT and increased motility.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adherens Junctions / metabolism
  • Apoptosis / genetics
  • Caco-2 Cells
  • Cell Movement / genetics
  • Cell Respiration / genetics
  • Colorectal Neoplasms / metabolism*
  • Colorectal Neoplasms / pathology*
  • Epithelial Cells / metabolism
  • Epithelial-Mesenchymal Transition*
  • Extracellular Matrix / metabolism
  • Gene Expression Regulation
  • Gene Knockdown Techniques
  • Genome, Human
  • Humans
  • Mesoderm / metabolism
  • Microtubule-Associated Proteins / metabolism
  • Microtubules / metabolism
  • Nerve Tissue Proteins / deficiency*
  • Nerve Tissue Proteins / metabolism
  • Phenotype
  • Principal Component Analysis
  • Receptors, Cell Surface / deficiency*
  • Receptors, Cell Surface / metabolism
  • Stress Fibers / metabolism
  • Transcriptome / genetics
  • Wound Healing*

Substances

  • MAPRE1 protein, human
  • Microtubule-Associated Proteins
  • NEO1 protein, human
  • Nerve Tissue Proteins
  • Receptors, Cell Surface