Impact of human mesenchymal cells of different body site origins on the maturation of dermo-epidermal skin substitutes
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Aim of the study
The use of autologous bio-engineered dermo-epidermal skin substitutes (DESS) yields a pivotal opportunity to cover large skin defects in human patients. These skin grafts consist of both epidermal and dermal compartments necessary for robust and permanent functional wound closure. In this study, we investigated the impact of mesenchymal cells derived from different body site origins on the expression pattern of diverse markers within DESS.
Human keratinocytes were obtained from interfollicular epidermis, and mesenchymal cells were isolated from foreskin, palmar skin, fat tissue, and tonsils. After expansion, epidermal cells were seeded on collagen I hydrogels containing stromal cells. These human DESS were transplanted on the back of immune-incompetent rats. After 3 weeks, transplants were excised and analyzed using immunohistology techniques.
The macroscopic appearance of skin grafts containing tonsil, fat tissue, or palmar derived mesenchymal cells, was similar to substitutes with foreskin derived dermal fibroblasts. All skin grafts had a strong membrane-localized expression of Lingo-1 in the epidermis. Additionally, we observed an intense expression of transglutaminase 5 in upper epidermal cell layers of the skin grafts confirming a proper keratinocyte differentiation. Tropoelastin was localized throughout the dermal compartments and tightly in contact with the dermo-epidermal junction suggesting an advanced maturation of all skin grafts.
Our data implicate that stromal cells derived from tonsil, fat tissue, and palmar skin can assume fibroblast functions supporting keratinocyte proliferation and differentiation. These findings indicate that distinct types of mesenchymal cells can be clinically used for skin engineering purposes.
KeywordsSkin tissue engineering Human dermo-epidermal skin substitutes Mesenchymal cells Lingo-1 Tropoelastin
This work was financially supported by the Clinical Research Priority Programs (CRPP) of the Faculty of Medicine of the University of Zurich. We are particularly grateful to the Gaydoul Foundation and the sponsors of “DonaTissue” (Thérèse Meier and Robert Zingg) for their generous financial support and interest in our work.
Compliance with ethical standards
Conflict of interest
ER and MM are co-founding members and shareholders of “Cutiss AG”, a company to fund the further development of the tissue-engineered skin substitutes. All other authors declare that they have no conflict of interest.
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