Extraneous E-Cadherin Engages the Deterministic Process of Somatic Reprogramming through Modulating STAT3 and Erk1/2...

Area of Science:

• Cellular reprogramming
• Stem cell biology
• Molecular mechanisms

Background:

• Somatic cell reprogramming into induced pluripotent stem cells (iPSCs) can follow different pathways.
• The molecular drivers dictating the choice between these reprogramming modes remain largely unelucidated.

Purpose of the Study:

• To investigate the molecular events governing the selection of reprogramming modes during somatic cell reprogramming.
• To identify key signaling pathways and factors influencing the initiation of reprogramming.

Main Methods:

• Analysis of signaling pathway activities, specifically STAT3 and Erk1/2.
• Investigating the role of E-cadherin in early reprogramming events.
• Experimental manipulation of signaling pathway ratios in the cellular milieu.

Main Results:

• The ratio of phosphorylated STAT3 (pSTAT3) to phosphorylated Erk1/2 (pErk1/2) activity reversibly determines the reprogramming mode.
• A lower pSTAT3/pErk1/2 activity ratio promotes the deterministic reprogramming process.
• Increased E-cadherin expression facilitates early reprogramming by stabilizing key receptor complexes (LIF/gp130, EGFR/ErbB2).

Conclusions:

• The pSTAT3/pErk1/2 activity ratio is a critical determinant of reprogramming mode selection.
• Extraneous E-cadherin can enhance the initiation of somatic reprogramming towards a deterministic pathway.
• Modulating the signaling environment offers a strategy to direct OSKM-mediated reprogramming outcomes.