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Desmoplakin is essential in epidermal sheet formation.

V Vasioukhin1, E Bowers, C Bauer

  • 1Department of Molecular Genetics and Cell Biology, Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois 60637, USA.

Nature Cell Biology
|January 10, 2002
PubMed
Summary

Epidermal integrity requires desmoplakin (DP), a protein essential for cell adhesion. Without DP, skin loses mechanical strength, leading to separations and compromised cell junctions.

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Area of Science:

  • Cell Biology
  • Dermatology
  • Biochemistry

Background:

  • Desmoplakin (DP) is a key component of desmosomes, cell-cell adhesion structures.
  • The precise role of DP in maintaining epidermal integrity and cytoskeletal organization is not fully understood.

Purpose of the Study:

  • To investigate the function of desmoplakin (DP) in epidermal integrity using a specific mouse knockout model.
  • To elucidate the role of DP in desmosome assembly, keratin filament anchoring, and epithelial cell adhesion.

Main Methods:

  • Generation of an epidermis-specific desmoplakin (DP) knockout mouse model.
  • Analysis of skin and keratinocyte phenotypes, including mechanical stress testing, desmosome structure, and keratin filament association.
  • In vitro rescue experiments with DP transgene expression.

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Main Results:

  • DP-null skin exhibits compromised epidermal integrity and intercellular separations under mechanical stress.
  • Desmosomes in DP-null epidermis lack keratin filament attachment, impairing their function.
  • DP-null keratinocytes show reduced desmosome formation in vitro and defects in actin reorganization and membrane sealing during epithelial sheet formation.
  • Adherens junctions are also reduced in DP-null epidermis.

Conclusions:

  • Desmoplakin (DP) is essential for the assembly of functional desmosomes and the maintenance of epidermal integrity.
  • DP plays a critical role in anchoring keratin filaments to desmosomes, ensuring cytoskeletal stability.
  • DP is vital for reinforcing membrane attachments, crucial for stable intercellular adhesion in the epidermis.