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Kindlin-1 Regulates Keratinocyte Electrotaxis.

Gaofeng Zhang1, Yu Gu2, Rumena Begum3

  • 1Department of Dermatology, No. 1 Hospital of China Medical University, Shenyang, China; School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff, UK.

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Kindler syndrome (KS) cells cannot move in response to electric fields due to defective kindlin-1. Restoring kindlin-1 function rescues this electrotaxis defect, revealing its role in skin cell migration.

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Area of Science:

  • Dermatology
  • Cell Biology
  • Biophysics

Background:

  • Kindler syndrome (KS) is a rare blistering skin disorder caused by mutations in the FERMT1 gene, leading to absent or reduced kindlin-1 protein.
  • Kindlin-1 is crucial for focal adhesion and integrin activation, impacting keratinocyte adhesion and migration.
  • Electric fields are known regulators of cell adhesion and migration, but their molecular mechanisms in skin are unclear.

Purpose of the Study:

  • To investigate the role of kindlin-1 in keratinocyte electrotaxis.
  • To elucidate the molecular mechanisms by which kindlin-1 regulates cell migration in response to electric fields.
  • To understand how kindlin-1 defects contribute to Kindler syndrome pathology.

Main Methods:

  • Utilized keratinocytes derived from Kindler syndrome patients.
  • Assessed electrotaxis (directional cell migration) in response to electric fields.
  • Employed gene rescue experiments, including overexpression of wild-type and mutant kindlin-1 (W612A, PH domain deletion).
  • Investigated the role of β1 integrins in electrotaxis.

Main Results:

  • Kindler syndrome keratinocytes exhibited a significant defect in electrotaxis.
  • Overexpression of wild-type kindlin-1 restored electrotaxis, while specific mutations (W612A, PH domain deletion) failed to rescue the defect.
  • Kindlin-1 is essential for maintaining lamellipodial protrusions during electrotaxis, dependent on electric field-activated β1 integrins.
  • Inhibition of β1 integrins also abolished keratinocyte electrotaxis.

Conclusions:

  • Kindlin-1 is indispensable for keratinocyte electrotaxis, requiring both integrin and lipid binding domains.
  • Loss of kindlin-1 function impairs epithelial response to electric fields, potentially contributing to the pathogenesis of Kindler syndrome.
  • β1 integrins play a critical role in mediating electric field-induced cell migration, regulated by kindlin-1.