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C-terminal Src kinase controls development and maintenance of mouse squamous epithelia

Reiko Yagi1, Satoshi Waguri, Yasuyuki Sumikawa

  • 1Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan.

The EMBO Journal
|February 17, 2007
PubMed

Insights

Carboxy-terminal Src kinase (Csk) inactivation in epithelial tissues causes skin defects and inflammation. This highlights Csk

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Dermatology

Background:

  • Carboxy-terminal Src kinase (Csk) negatively regulates Src family kinases, impacting cell adhesion, migration, and cancer.
  • Epithelial tissues rely on Src family kinases for structural integrity and function.

Purpose of the Study:

  • To investigate the in vivo function of Csk in squamous epithelial tissues.
  • To understand the role of Csk in maintaining epithelial homeostasis and its link to inflammation.

Main Methods:

  • Conditional inactivation of Csk in mouse squamous epithelia using the keratin-5 promoter/Cre-loxP system.
  • Histological analysis of skin, esophagus, and forestomach tissues.
  • Primary keratinocyte culture and analysis of cell adhesion, cytoskeletal organization, and gene expression.

Main Results:

  • Csk inactivation led to epidermal defects, hyperplasia, and chronic inflammation in multiple epithelial tissues.
  • Impaired cell-cell adhesion in mutant epidermis was linked to Rac1 pathway activation and cytoskeletal remodeling.
  • Elevated expression of mesenchymal markers, MMPs, and TNF-alpha was observed in mutant keratinocytes.
  • FK506 treatment, inhibiting TNF-alpha and MMP9, reversed epidermal hyperplasia, indicating a link between inflammation and hyperplasia.

Conclusions:

  • The Src/Csk signaling pathway is critical for epithelial development and maintenance.
  • Csk regulates cytoskeletal organization and controls phenotypic conversion associated with inflammatory responses in epithelia.

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