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Spectrin coordinates cell shape and signaling essential for epidermal differentiation.

Arad Soffer1, Aishwarya Bhosale2,3, Roohallah Ghodrat2,3

  • 1Gray School of Medical Sciences, Gray Faculty of Medical and Health Sciences, Tel Aviv University, Tel Aviv, Israel.

The Journal of Cell Biology
|February 12, 2026
PubMed
Summary
This summary is machine-generated.

Spectrin organizes the actomyosin cortex, linking cell shape and differentiation in the epidermis. This cytoskeletal regulation is crucial for epithelial barrier formation and tissue development.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Developmental Biology

Background:

  • Cell shape and fate are interconnected, but the mechanisms by which the cortical cytoskeleton integrates these processes are not fully understood.
  • The multilayered epidermis serves as a model to study how cell shape influences differentiation and tissue organization.

Purpose of the Study:

  • To investigate the role of spectrin in organizing the actomyosin cortex and integrating cell shape with signaling pathways.
  • To elucidate how cortical cytoskeletal organization directs cell shape transitions and cell fate decisions in the epidermis.

Main Methods:

  • Utilized mouse epidermis as a model system.
  • Employed high-resolution imaging and laser ablation techniques.
  • Investigated the function of αII-spectrin (Sptan1) in epidermal differentiation and barrier formation.

Main Results:

  • Loss of αII-spectrin disrupted epidermal cell shape, impaired differentiation, and compromised barrier function.
  • E-cadherin organizes layer-specific cortical actin and spectrin networks, influencing cell shape and fate.
  • These networks dissipate tension and retain signaling molecules like EGFR and TRPV3 to promote terminal differentiation.

Conclusions:

  • Spectrin is essential for organizing the actomyosin cortex, integrating cell shape with signaling for epidermal differentiation.
  • Polarized cortical cytoskeletal organization directs cell shape and fate transitions, crucial for establishing epithelial barriers.