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Laminin-5 inhibits human keratinocyte migration
E A O'Toole1, M P Marinkovich, W K Hoeffler
1Department of Dermatology, Northwestern University, Chicago, Illinois 60611, USA.
Experimental Cell Research
|June 15, 1997
Summary
Laminin-5, a skin protein, surprisingly inhibits keratinocyte migration by binding to alpha3 integrin receptors. This finding explains certain skin blistering disorders and suggests laminin-5 stabilizes migrating cells during wound healing.
Area of Science:
- Cell Biology
- Dermatology
- Biochemistry
Background:
- Laminin-5 is an adhesive protein in the skin's basement membrane zone, crucial for epidermal structure.
- Human keratinocytes synthesize and deposit laminin-5, which is present during wound reepithelialization.
Purpose of the Study:
- To investigate the role of laminin-5 in regulating human keratinocyte migration.
- To elucidate the mechanism by which laminin-5 affects keratinocyte motility.
Main Methods:
- Studied the effect of purified laminin-5 on keratinocyte migration in vitro.
- Utilized alpha3 integrin receptor blocking and antisense oligonucleotides to investigate endogenous laminin-5 function.
- Examined laminin-5's concentration-dependent effects on collagen-induced keratinocyte motility.
Main Results:
- Laminin-5 acts as a potent inhibitor of human keratinocyte migration.
- This inhibitory effect is reversible by blocking the alpha3 integrin receptor.
- Endogenous laminin-5 secreted by keratinocytes also inhibits their own migration.
Conclusions:
- Laminin-5's inhibition of keratinocyte migration is mediated through the alpha3 integrin receptor.
- Defects in laminin-5 explain hypermotility in certain epidermolysis bullosa subtypes.
- Secreted laminin-5 stabilizes migrating keratinocytes during skin wound reepithelialization.