Delineation of the key aspects in the regulation of epithelial monolayer formation

Lydia Aschauer, Leonhard N Gruber, Walter Pfaller, Alice Limonciel, Toby J Athersuch, Rachel Cavill, Abdulhameed Khan, Gerhard Gstraunthaler, Johannes Grillari, Regina Grillari-Voglauer, Philip Hewitt, Martin O Leonard, Anja Wilmes, Paul Jennings

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The formation, maintenance, and repair of epithelial barriers are of critical importance for whole-body homeostasis. However, the molecular events involved in epithelial tissue maturation are not fully established. To this end, we investigated the molecular processes involved in renal epithelial proximal-tubule monolayer maturation utilizing transcriptomic, metabolomic, and functional parameters. We uncovered profound dynamic alterations in transcriptional regulation, energy metabolism, and nutrient utilization over the maturation process. Proliferating cells exhibited high glycolytic rates and high transcript levels for fatty acid synthesis genes (FASN), whereas matured cells had low glycolytic rates, increased oxidative capacity, and preferentially expressed genes for beta oxidation. There were dynamic alterations in the expression and localization of several adherens (CDH1, -4, and -16) and tight junction (TJP3 and CLDN2 and -10) proteins. Genes involved in differentiated proximal-tubule function, cilium biogenesis (BBS1), and transport (ATP1A1 and ATP1B1) exhibited increased expression during epithelial maturation. Using TransAM transcription factor activity assays, we could demonstrate that p53 and FOXO1 were highly active in matured cells, whereas HIF1A and c-MYC were highly active in proliferating cells. The data presented here will be invaluable in the further delineation of the complex dynamic cellular processes involved in epithelial cell regulation.

Original languageEnglish
Pages (from-to)2535-2550
Number of pages16
JournalMolecular and Cellular Biology
Volume33
Issue number13
DOIs
Publication statusPublished - Jul 2013
Externally publishedYes

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Keywords

  • Adherens Junctions
  • Cadherins
  • Cell Adhesion
  • Cell Movement
  • Cell Proliferation
  • Cells, Cultured
  • Cilia
  • Claudins
  • Epithelial Cells
  • Fatty Acids
  • G1 Phase
  • Gene Expression
  • Gene Expression Profiling
  • Glycogen
  • Humans
  • Kidney Tubules, Proximal
  • Magnetic Resonance Spectroscopy
  • Mesoderm
  • Oxygen
  • Telomerase
  • Transcription Factors
  • Journal Article
  • Research Support, Non-U.S. Gov't

Cite this

Aschauer, L., Gruber, L. N., Pfaller, W., Limonciel, A., Athersuch, T. J., Cavill, R., ... Jennings, P. (2013). Delineation of the key aspects in the regulation of epithelial monolayer formation. Molecular and Cellular Biology, 33(13), 2535-2550. https://doi.org/10.1128/MCB.01435-12