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CDK5 regulates cell adhesion and migration in corneal epithelial cells
Chun Gao1, Sewite Negash, Hong Tao Guo
1National Eye Institute, NIH, Bethesda, MD. Yang Ming University, Taipei, Taiwan.
Molecular Cancer Research : MCR
|December 24, 2002
Summary
Cyclin-dependent kinase 5 (CDK5) and its activator p35 are key regulators of corneal epithelial cell adhesion and migration. Increased CDK5 activity enhances cell adhesion but decreases cell migration, suggesting a crucial role in corneal wound healing.
Area of Science:
- Ophthalmology
- Cell Biology
- Molecular Biology
Background:
- Cyclin-dependent kinase 5 (CDK5) and its activator p35 are expressed in the mouse corneal epithelium.
- Both proteins are localized to all layers of the corneal epithelium, particularly the basal side.
Purpose of the Study:
- To investigate the role of CDK5 in regulating corneal epithelial cell adhesion and migration.
- To determine if CDK5 kinase activity is essential for these cellular processes.
Main Methods:
- Stable transfection of corneal epithelial cells to modulate CDK5 expression and activity.
- Coimmunoprecipitation to confirm CDK5 and p35 interaction.
- Assessment of cell adhesion to fibronectin.
- In vitro scrape wound assay to evaluate cell migration.
Main Results:
- Increased CDK5 expression and activity (by ~33%) enhanced corneal epithelial cell adhesion to fibronectin.
- A kinase-inactive CDK5 mutant (CDK5-T33) either reduced adhesion or had no significant effect.
- CDK5 overexpression decreased cell migration into a scraped wound area.
- The kinase-inactive CDK5 mutant increased cell migration into the wound area.
Conclusions:
- CDK5 plays a significant role in regulating both adhesion and migration of corneal epithelial cells.
- CDK5 kinase activity is required for its effects on cell adhesion.
- CDK5 may be an important factor in corneal epithelial wound healing processes.