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Expression of anionic sites at the dermoepibolic junction
The Journal of Investigative Dermatology
|January 1, 1987
Summary
Anionic sites emerge during basement membrane formation. These sites, sensitive to heparitinase, form with the basal lamina in a 7-day organ culture model.
Area of Science:
- Cell Biology
- Developmental Biology
- Extracellular Matrix Research
Background:
- Basement membrane zone formation is crucial for tissue structure and function.
- The composition and development of anionic sites within this zone are not fully understood.
Purpose of the Study:
- To investigate the emergence and characteristics of anionic sites during basement membrane zone formation.
- To elucidate the temporal relationship between anionic site appearance and basal lamina assembly.
Main Methods:
- Utilized migrating epidermis in organ culture as a model system.
- Employed ultrastructural investigations with a strongly cationized probe.
- Assessed the sensitivity of anionic sites to heparitinase digestion.
Main Results:
- Identified heparitinase-sensitive anionic sites during basement membrane zone formation.
- Demonstrated synchronous formation of these anionic sites with the newly synthesized basal lamina.
- Observed this synchronous event after 7 days in organ culture.
Conclusions:
- Heparitinase-sensitive anionic sites are integral components of the developing basement membrane zone.
- Their formation coincides precisely with basal lamina assembly, suggesting a coordinated developmental process.
- Organ culture provides a viable model for studying basement membrane development in situ.