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alpha3beta1 Integrin is required for normal development of the epidermal basement membrane
C M DiPersio1, K M Hodivala-Dilke, R Jaenisch
1Center for Cancer Research, and Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA.
The Journal of Cell Biology
|May 5, 1997
Summary
Integrin alpha3beta1 deficiency disrupts basement membrane integrity in skin, leading to disorganization and blistering. Integrin alpha6beta4 is crucial for stable epidermal adhesion, highlighting distinct roles in skin development.
Area of Science:
- Dermatology
- Cell Biology
- Developmental Biology
Background:
- Integrins alpha3beta1 and alpha6beta4 are key keratinocyte receptors for laminin-5.
- These integrins localize to distinct structures: alpha6beta4 in hemidesmosomes, alpha3beta1 in focal contacts.
- Understanding their distinct functions is vital for skin development and integrity.
Purpose of the Study:
- To investigate the functional roles of integrins alpha3beta1 and alpha6beta4 in skin development.
- To determine if distinct localization patterns reflect unique functions in the epidermis.
Main Methods:
- Studied skin development in alpha3beta1-deficient mice.
- Utilized immunofluorescence and electron microscopy to examine the extracellular matrix.
- Analyzed keratinocyte adhesion and spreading on laminin-5.
Main Results:
- Alpha3beta1 deficiency caused progressive basement membrane disorganization starting at embryonic day 15.5.
- Neonatal skin showed frequent blistering at the dermal-epidermal junction due to basement membrane rupture.
- Alpha3beta1-deficient keratinocytes exhibited impaired spreading on laminin-5, indicating a post-attachment role.
Conclusions:
- Integrin alpha3beta1 plays a novel role in establishing and maintaining basement membrane integrity.
- Integrin alpha6beta4 is essential for stable epidermal adhesion via hemidesmosomes.
- These integrins have distinct, non-redundant functions in skin development and basement membrane organization.