Abstract
Purpose
Human autologous tissue-engineered skin grafts are a promising way to cover skin defects. Clearly, it is mandatory to study essential biological dynamics after transplantation, including reinnervation. Previously, we have already shown that human tissue-engineered skin analogs are reinnervated by host nerve fibers as early as 8 weeks after transplantation. In this study, we tested the hypothesis that there is a de novo formation of a “classical” neurovascular link in tissue-engineered and then transplanted skin substitutes.
Methods
Keratinocytes, melanocytes, and fibroblasts were isolated from human skin biopsies. After expansion in culture, keratinocytes and melanocytes were seeded on dermal fibroblast-containing collagen type I hydrogels. These human tissue-engineered dermo-epidermal skin analogs were transplanted onto full-thickness skin wounds on the back of immuno-incompetent rats. Grafts were analyzed after 3 and 10 weeks. Histological sections were examined with regard to the ingrowth pattern of myelinated and unmyelinated nerve fibers into the skin analogs using markers such as PGP9.5, NF-200, and NF-160. Blood vessels were identified with CD31, lymphatic vessels with Lyve1. In particular, we focused on alignment patterns between nerve fibers and either blood and/or lymphatic vessels with regard to neurovascular link formation.
Results
3 weeks after transplantation, blood vessels, but no nerve fibers or lymphatic vessels could be observed. 10 weeks after transplantation, we could detect an ingrowth of myelinated and unmyelinated nerve fibers into the skin analogs. Nerve fibers were found in close proximity to CD31-positive blood vessels, but not alongside Lyve1-positive lymphatic vessels.
Conclusion
These data suggest that host-derived innervation of tissue-engineered dermo-epidermal skin analogs is initiated by and guided alongside blood vessels present early post-transplantation. This observation is consistent with the concept of a cross talk between neurovascular structures, known as the neurovascular link.
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Acknowledgments
This work was financially supported by the EU-FP7 project EuroSkinGraft (FP7/2007-2013: Grant Agreement No. 279024), by the EU-FP7 (MultiTERM, Grant Agreement No. 238551) and the Clinical Research Priority Programs (KFSP: From basic research to the clinic: Novel tissue engineered skin grafts for Zurich) of the Faculty of Medicine of the University of Zurich. We are particularly grateful to the Fondation Gaydoul and the sponsors of “DonaTissue” (Thérèse Meier and Robert Zingg) for their generous financial support and interest in our work.
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The authors declare that they have no conflict of interest.
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T. Biedermann and A. S. Klar contributed equally to this paper.
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Biedermann, T., Klar, A.S., Böttcher-Haberzeth, S. et al. Tissue-engineered dermo-epidermal skin analogs exhibit de novo formation of a near natural neurovascular link 10 weeks after transplantation. Pediatr Surg Int 30, 165–172 (2014). https://doi.org/10.1007/s00383-013-3446-x
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DOI: https://doi.org/10.1007/s00383-013-3446-x