Hypoxia activates cadherin-22 synthesis via eIF4E2 to drive cancer cell migration, invasion and adhesion

Oncogene. 2018 Feb 1;37(5):651-662. doi: 10.1038/onc.2017.372. Epub 2017 Oct 9.

Abstract

Hypoxia is a driver of cell movement in processes such as development and tumor progression. The cellular response to hypoxia involves a transcriptional program mediated by hypoxia-inducible factors, but translational control has emerged as a significant contributor. In this study, we demonstrate that a cell-cell adhesion molecule, cadherin-22, is upregulated in hypoxia via mTORC1-independent translational control by the initiation factor eIF4E2. We identify new functions of cadherin-22 as a hypoxia-specific cell-surface molecule involved in cancer cell migration, invasion and adhesion. Silencing eIF4E2 or cadherin-22 significantly impaired MDA-MB-231 breast carcinoma and U87MG glioblastoma cell migration and invasion only in hypoxia, while reintroduction of the respective exogenous gene restored the normal phenotype. Cadherin-22 was evenly distributed throughout spheroids and required for their formation and support of a hypoxic core. Conversely, E-cadherin translation was repressed by hypoxia and only expressed in the oxygenated cells of U87MG spheroids. Furthermore, immunofluorescence on paraffin-embedded human tissue from 40 glioma and 40 invasive ductal breast carcinoma patient specimens revealed that cadherin-22 expression colocalized with areas of hypoxia and significantly correlated with tumor grade and progression-free survival or stage and tumor size, respectively. This study broadens our understanding of tumor progression and metastasis by highlighting cadherin-22 as a potential new target of cancer therapy to disable hypoxic cancer cell motility and adhesion.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigens, CD
  • Breast Neoplasms / genetics
  • Breast Neoplasms / pathology*
  • Cadherins / genetics*
  • Cadherins / metabolism
  • Carcinoma, Ductal, Breast / genetics
  • Carcinoma, Ductal, Breast / pathology*
  • Cell Adhesion / genetics
  • Cell Hypoxia / physiology
  • Cell Line, Tumor
  • Cell Movement / genetics
  • Disease Progression
  • Eukaryotic Initiation Factor-4E
  • Female
  • Gene Expression Regulation, Neoplastic / physiology
  • Gene Knockdown Techniques
  • Glioma / genetics
  • Glioma / pathology*
  • Humans
  • Mechanistic Target of Rapamycin Complex 1 / genetics
  • Mechanistic Target of Rapamycin Complex 1 / metabolism
  • Neoplasm Grading
  • Neoplasm Invasiveness / genetics
  • Neoplasm Staging
  • RNA Cap-Binding Proteins / genetics
  • RNA Cap-Binding Proteins / metabolism*
  • RNA, Messenger / metabolism
  • RNA, Small Interfering / metabolism
  • Spheroids, Cellular
  • Up-Regulation

Substances

  • Antigens, CD
  • CDH1 protein, human
  • Cadherins
  • EIF4E2 protein, human
  • Eukaryotic Initiation Factor-4E
  • RNA Cap-Binding Proteins
  • RNA, Messenger
  • RNA, Small Interfering
  • CDH22 protein, human
  • Mechanistic Target of Rapamycin Complex 1