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Tenascin expression during wound healing in human skin
M A Latijnhouwers1, M Bergers, B H Van Bergen
1Department of Dermatology, University Hospital Nijmegen, The Netherlands.
The Journal of Pathology
|January 1, 1996
Summary
Tenascin, a glycoprotein, is not a substrate for migrating keratinocytes during wound healing. Its expression increases with hyperproliferative epidermis, and keratinocytes may interact with it later as the basement membrane forms.
Area of Science:
- Dermatology
- Cell Biology
- Extracellular Matrix Research
Background:
- Tenascin, an extracellular matrix glycoprotein, has limited expression in adult human skin.
- Dermal tenascin expression is significantly upregulated in hyperproliferative conditions like psoriasis and epidermal tumors.
Purpose of the Study:
- Investigate tenascin expression patterns and kinetics during human skin wound healing.
- Determine if keratinocytes interact with tenascin during re-epithelialization.
Main Methods:
- Immunohistochemistry was used to examine tenascin expression in excisional wounds, skin explants, and chronic venous ulcers.
- Proliferating cell nuclear antigen (PCNA) and Ki-67 staining assessed epidermal proliferation.
Main Results:
- No tenascin was detected beneath the leading edge of migrating keratinocytes in wounds and explants.
- Dermal tenascin strongly upregulated adjacent to hyperproliferative epidermis (10-50 cells behind leading edge).
- Tenascin was present in the wound bed in later stages and chronic ulcers, where basement membrane formation was incomplete.
Conclusions:
- Tenascin does not serve as a substrate for migrating keratinocytes.
- Hyperproliferative epidermis drives rapid tenascin induction in the papillary dermis during wound healing.
- Incomplete basement membrane formation in later wound healing stages allows potential keratinocyte-tenascin interaction in the wound bed.