Cited by 57Tissue Engineering and Regenerative MedicineWound Healing and TreatmentsMesenchymal stem cell research

Bio-engineering a prevascularized human tri-layered skin substitute containing a hypodermis

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Zimoch, Jakub, Zielinska, Dominika, Michalak-Micka, Katarzyna, Rütsche, Dominic, Böni, Roland, Biedermann, Thomas, Klar, Agnes S.·2021·Acta Biomaterialia

Abstract

Severe injuries to skin including hypodermis require full-thickness skin replacement. Here, we bioengineered a tri-layered human skin substitute (TLSS) containing the epidermis, dermis, and hypodermis. The hypodermal layer was generated by differentiation of human adipose stem cells (ASC) in a collagen type I hydrogel and combined with a prevascularized dermis consisting of human dermal microvascular endothelial cells and fibroblasts, which arranged into a dense vascular network. Subsequently, keratinocytes were seeded on top to generate the epidermal layer of the TLSS. The differentiation of ASC into adipocytes was confirmed in vitro on the mRNA level by the presence of adiponectin, as well as by the expression of perilipin and FABP-4 proteins. Moreover, functional characteristics of the hypodermis in vitro and in vivo were evaluated by Oil Red O, BODIPY, and AdipoRed stainings visualizing intracellular lipid droplets. Further, we demonstrated that both undifferentiated ASC and mature adipocytes present in the hypodermis influenced the keratinocyte maturation and homeostasis in the skin substitutes after transplantation. In particular, an enhanced secretion of TGF-β1 by these cells affected the epidermal morphogenesis as assessed by the expression of key proteins involved in the epidermal differentiation including cytokeratin 1, 10, 19 and cornified envelope formation such as involucrin. Here, we propose a novel functional hypodermal-dermo-epidermal tri-layered skin substitute containing blood capillaries that efficiently promote regeneration of skin defects. STATEMENT OF SIGNIFICANCE: The main objective of this study was to develop and assess the usefulness of a tri-layered human prevascularized skin substitute (TLSS) containing an epidermis, dermis, and hypodermis. The bioengineered hypodermis was generated from human adipose mesenchymal stem cells (ASC) and combined with a prevascularized dermis and epidermis. The TLSS represents an exceptional model for studying the role of cell-cell and cell-matrix interactions in vitro and in vivo. In particular, we observed that enhanced secretion of TGF-β1 in the hypodermis exerted a profound impact on fibroblast and keratinocyte differentiation, as well as epidermal barrier formation and homeostasis. Therefore, improved understanding of the cell-cell interactions in such a physiological skin model is essential to gain insights into different aspects of wound healing.

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Crossref · 10.1016/j.actbio.2021.07.033

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  • aHSEs can integrate additional cell types including endothelial cells, melanocytes, neuronal cells, lymphatic cells, immune cells, adipocytes, pluripotent stem cells, and skin appendages.

    “These include endothelial cells to vascularize the dermis [46] and melanocytes to introduce pigmentation [47]. Furthermore, neuronal cells [48,49], lymphatic cells [50], immune cells (e.g. dermal dendritic cells [51], monocytes [52], T cells [53], and macrophages [54]), adipocytes and adipose tissue [49,55,56], pluripotent stem cells [22,36,57], and skin appendages such as hair follicles or sweat”

    From Diversity of human skin three-dimensional organotypic cultures (2024) · cites this paper as [46]

    The cited paper supports the adipocyte and adipose-tissue portion: its Introduction describes generating a hypodermal layer from adipose-derived stem cells, and its Discussion describes the resulting tri-layered skin substitute. Citation [49] is also attached to neuronal cells in the citing sentence, but the paper does not report incorporating neuronal cells. The other listed cell types have separate citations and are not assessed here. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Adipose tissue critically contributes to the regulation of HF cycling.

    “suggesting a critical contribution to the regulation of HFs cycling [22].”
  • The hypodermis layer supports fibroblast proliferation during skin wound healing.

    “but also supports fibroblast proliferation during skin wound healing [22, 25].”
  • The hypodermis layer contributes to the mechanical and thermoregulatory properties of normal skin.

    “The Hypodermis layer not only contributes to the mechanical and thermoregulatory properties of the normal skin”

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Cites

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Research works printed but not linked: 6

  1. A.S. Klar, S. Güven, T. Biedermann, J. Luginbühl, S. Böttcher-Haberzeth, C. Meuli-Simmen, M. Meuli, I. Martin, A. Scherberich, E. Reichmann, Tissue- engineered dermo-epidermal skin grafts prevascularized with adipose-derived cells, Biomaterials 35 (2014), doi: 10.1016/j.biomaterials.2014.02.049 . · DOI
  2. D. Marino , J. Luginbühl , S. Scola , M. Meuli , E. Reichmann , Bioengineering Dermo-Epidermal Skin Grafts with Blood and Lymphatic Capillaries, 2014, pp. 1-14 .
  3. L. Pontiggia, T. Biedermann, M. Meuli, D. Widmer, S. Böttcher-Haberzeth, C. Schiestl, J. Schneider, E. Braziulis, I. Montaño, C. Meuli-Simmen, E. Reich- mann, Markers to evaluate the quality and self-renewing potential of engi- neered human skin substitutes in vitro and after transplantation, J. Invest. Der- matol. 129 (2009) 4 80-4 90, doi: 10.1038/jid.2008.254 . · DOI
  4. J.N. Fain, D.S. Tichansky, A.K. Madan, Transforming growth factor beta1 release by human adipose tissue is enhanced in obesity, Metabolism 54 (2005) 1546- 1551, doi: 10.1016/j.metabol.2005.05.024 . · DOI
  5. C. Oostendorp, S. Meyer, M. Sobrio, J. van Arendonk, E. Reichmann, W.F. Daa- men, T.H. van Kuppevelt, Evaluation of cultured human dermal-and dermo- epidermal substitutes focusing on extracellular matrix components: compari- son of protein and RNA analysis, Burns 43 (2017) 520-530, doi: 10.1016/j.burns. 2016.10.002 . · DOI
  6. M. Meuli, F. Hartmann-Fritsch, M. Hüging, D. Marino, M. Saglini, S. Hynes, K. Neuhaus, E. Manuel, E. Middelkoop, E. Reichmann, C. Schiestl, A cultured autologous dermo-epidermal skin substitute for full-thickness skin defects: a phase I, open, prospective clinical trial in children, Plast. Reconstr. Surg. 144 (2019) 188-198, doi: 10.1097/PRS.0 0 0 0 0 0 0 0 0 0 0 05746 . · DOI

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Authors
Zimoch, J., Zielinska, D., Michalak-Micka, K., Rütsche, D., Böni, R., Biedermann, T., & Klar, A. S.
Affiliations
  • University of Zurich (CH)
  • The White House (US)
Corresponding author
Klar, Agnes S.
Venue
Acta Biomaterialia
Publisher
Elsevier BV
Published
2021-10
Volume
134
Pages
215-227
ISSN
1742-7061 (ISSN-L)
OpenAlex
W3154026603
Cited by
57
References
71
Citations by year
2026: 6 · 2025: 15 · 2024: 17 · 2023: 8 · 2022: 9 · 2021: 2
FWCI
8.52
Type
journal article
Language
en
Open access
Locations
  • Acta Biomaterialia (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by-nc-nd)
  • SSRN Electronic Journal (submittedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by-nc-nd)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (179012, CRSII5_173868)
  • Universität Zürich
  • Fondation Gaydoul
  • Olga Mayenfisch Stiftung
Topics
  • Health Sciences › Medicine › Surgery › Tissue Engineering and Regenerative Medicine
  • Health Sciences › Medicine › Rehabilitation › Wound Healing and Treatments
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
Keywords
subcutaneous tissue, adipose-derived stem cells, adipogenesis, type I collagen gel, dermal microvascular endothelial cells, fibroblasts, keratinocyte maturation, epidermal barrier formation, TGF-β1, wound healing, full-thickness skin defect, adipose tissue regeneration, cell-cell interactions
MeSH terms
Fibroblasts, Humans, Skin, Keratinocytes, Skin, Artificial, Dermis, Tissue Engineering, Subcutaneous Tissue, Endothelial Cells, Bioengineering

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