TNF-alpha stimulation increases dental pulp stem cell migration in vitro through integrin alpha-6 subunit...

Area of Science:

• Stem cell biology
• Immunology
• Regenerative medicine

Background:

• Stem cell migration is crucial for tissue repair and inflammatory responses.
• Tumor necrosis factor-alpha (TNF-α) is upregulated in inflamed tissues.
• Human dental pulp stem cells (hDPSCs) express integrin α6, linked to cell migration.

Purpose of the Study:

• To investigate the effect of TNF-α on hDPSC migration.
• To explore the relationship between TNF-α and integrin α6 expression in hDPSCs during migration.

Main Methods:

• Established hDPSC cultures and determined α6 integrin subunit expression.
• Evaluated TNF-α's effect on hDPSC migration using transwell and scratch assays.
• Assessed TNF-α-mediated migration with and without integrin α6, using siRNA to suppress integrin α6 expression.

Main Results:

• TNF-α significantly increased hDPSC migration.
• TNF-α upregulated integrin α6 expression.
• Knockdown of integrin α6 reduced TNF-α-directed hDPSC chemotaxis.

Conclusions:

• TNF-α activation of integrin α6 increases hDPSC migratory activity.
• A novel association between TNF-α and the integrin α6 chain regulates hDPSC migration.