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Integrin α6β4 and TRPV1 channel coordinately regulate directional keratinocyte migration
Ayako Miyazaki1, Tsuyako Ohkubo2, Mitsutoki Hatta2
1Department of Oral Growth and Development, Fukuoka Dental College, 2-15-1 Tamura, Sawara-ku, Fukuoka 814-0193, Japan.
Biochemical and Biophysical Research Communications
|February 1, 2015
Summary
Transient Receptor Potential Vanilloid 1 (TRPV1) channels regulate epithelial cell migration in wound healing. TRPV1 activation promotes keratinocyte migration, potentially through calcium signaling and integrin beta4 expression.
Area of Science:
- Cell Biology
- Wound Healing Research
- Calcium Signaling
Background:
- Directional migration of epithelial cells is vital for wound healing.
- Integrin beta4 is a known promigratory factor, and calcium (Ca2+) signaling coordinates cell migration.
- The role of Transient Receptor Potential Vanilloid 1 (TRPV1) channels in keratinocyte migration remains unclear.
Purpose of the Study:
- To investigate the function of TRPV1 in integrin beta4-related directional migration of keratinocytes.
- To explore the relationship between TRPV1, Ca2+ signaling, and integrin beta4 in the context of wound healing.
Main Methods:
- Scratch wound assay on murine keratinocyte monolayers (Pam212 cells).
- Double immunofluorescence staining to detect integrin beta4 and TRPV1 expression.
- Gene knockdown of integrin beta4 or TRPV1.
- Treatment with TRPV1 agonist (capsaicin) and antagonist.
Main Results:
- Integrin beta4 and TRPV1 were de novo expressed at the wound edge in migrating cells.
- Epidermal growth factor (EGF) upregulated both integrin beta4 and TRPV1, enhancing keratinocyte migration.
- Knockdown of integrin beta4 or TRPV1 significantly impaired wound closure.
- TRPV1 activation promoted migration, while antagonism inhibited it.
- TRPV1 knockdown reduced integrin beta4 gene and protein expression.
Conclusions:
- TRPV1 plays a significant role in regulating directional keratinocyte migration during wound healing.
- TRPV1 may stimulate migration directly via Ca2+ signaling or indirectly by modulating integrin beta4 expression.
- TRPV1 represents a potential therapeutic target for enhancing wound healing processes.
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