E-cadherin and, in its absence, N-cadherin promotes Nanog expression in mouse embryonic stem cells via STAT3

Kate Hawkins1, Lisa Mohamet, Sarah Ritson

  • 1Stem Cell Biology Group, Core Technology Facility, The University of Manchester, Manchester, United Kingdom.

Insights

E-cadherin maintains mouse embryonic stem cell pluripotency by promoting Klf4 and Nanog expression through STAT3 phosphorylation. N-cadherin supports this function, revealing a novel cadherin-pluripotency circuitry.

Area of Science:

  • Stem cell biology
  • Molecular and cell biology
  • Developmental biology

Background:

  • E-cadherin loss in mouse embryonic stem cells (mESCs) alters transcriptome and pluripotency signaling pathways.
  • E-cadherin is crucial for maintaining pluripotency in mESCs.

Purpose of the Study:

  • To elucidate the molecular mechanism by which E-cadherin regulates pluripotency in mESCs.
  • To investigate the role of E-cadherin and N-cadherin in leukemia inhibitory factor (LIF)-dependent pluripotency.

Main Methods:

  • Culture of E-cadherin null (Ecad(-/-)) mESCs in supplemented medium.
  • Analysis of transcript and protein expression (Klf4, Nanog, N-cadherin).
  • Assessment of STAT3 phosphorylation and cell-cell contact restoration.
  • Abrogation of N-cadherin using an inhibitory peptide.

Main Results:

  • E-cadherin promotes Klf4 and Nanog expression via STAT3 phosphorylation, requiring β-catenin.
  • Ecad(-/-) mESCs partially restore cell-cell contact, STAT3 phosphorylation, and upregulate Klf4, Nanog, and N-cadherin in LIF/BMP medium.
  • N-cadherin supports LIF-dependent pluripotency; its abrogation leads to loss of phospho STAT3, Klf4, and Nanog.

Conclusions:

  • A novel molecular mechanism links E-cadherin and N-cadherin to the core pluripotency circuitry in mESCs.
  • This mechanism may explain E-cadherin's role in induced pluripotent stem cell reprogramming.
  • Cadherin-mediated cell adhesion is critical for maintaining stem cell pluripotency.

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