Ouabain Accelerates Collective Cell Migration Through a cSrc and ERK1/2 Sensitive Metalloproteinase Activity

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Ouabain is known to regulate cell adhesion and migration in epithelial cells.
• Madin-Darby canine kidney (MDCK) cells are a widely used model for studying epithelial cell behavior.

Purpose of the Study:

• To investigate the effect of low-dose ouabain on collective cell migration in MDCK cells.
• To elucidate the signaling pathways and molecular mechanisms underlying ouabain-mediated cell migration.

Main Methods:

• MDCK cell monolayers were treated with 10 nM ouabain to assess wound healing and collective cell migration.
• Kinase inhibitors (PP2, PD98059) and matrix metalloproteinase (MMP) inhibitors (GM6001, iMMP-2) were used to block specific signaling pathways.
• Dominant-negative Focal Adhesion Kinase (FAK) peptide (FRNK) was transfected to inhibit FAK activity.
• Expression and activation of MMP-2 were analyzed.

Main Results:

• 10 nM ouabain significantly accelerated collective cell migration and wound healing in MDCK cell monolayers.
• The accelerative effect of ouabain was dependent on the activation of the cSrc-ERK1/2 signaling cascade.
• Ouabain treatment increased the expression and activation of MMP-2.
• Inhibition of MMP activity or FAK impaired the ouabain-induced acceleration of cell migration.

Conclusions:

• Ouabain binding to the Na+,K+-ATPase accelerates collective migration of MDCK cells.
• This acceleration is mediated by the activation of the cSrc-ERK1/2-FAK signaling cascade.
• The process involves the promotion of MMP-2 secretion and activity.