title: Epithelial and stromal developmental patterns in a novel substitute of the human skin generated with fibrin-agarose biomaterials.
abstract: Development of human skin substitutes by tissue engineering may offer new therapeutic alternatives to the use of autologous tissue grafts. For that reason, it is necessary to investigate and develop new biocompatible biomaterials that support the generation of a proper human skin construct. In this study, we generated a novel model of bioengineered human skin substitute using human cells obtained from skin biopsies and fibrin-agarose biomaterials and we evaluated this model both at the ex vivo and the in vivo levels. Once the dermal fibroblasts and the epithelial keratinocytes were isolated and expanded in culture, we used fibrin-agarose scaffolds for the development of a full-thickness human skin construct, which was evaluated after 1, 2, 3 and 4 weeks of development ex vivo. The skin substitutes were then grafted onto immune-deficient nude mice and analyzed at days 10, 20, 30 and 40 postimplantation using transmission electron microscopy, histochemistry and immunofluorescence. The results demonstrated that the fibrin-agarose artificial skin had adequate biocompatibility and proper biomechanical properties. A proper development of both the bioengineered dermis and epidermis was found after 30 days in vivo, although the tissues kept ex vivo and those implanted in the animal model for 10 or 20 days showed lower levels of differentiation. In summary, our model of fibrin-agarose skin equivalent was able to reproduce the structure and histological architecture of the native human skin, especially after long-term in vivo implantation, suggesting that these tissues could reproduce the native skin.
authors.affiliation: Department of Histology (Tissue Engineering Group), University of Granada, Granada, Spain.
authors.forename: Víctor
authors.initials: V
authors.lastname: Carriel
authors.forename: Ingrid
authors.initials: I
authors.lastname: Garzón
authors.forename: Jose-María
authors.initials: JM
authors.lastname: Jiménez
authors.forename: Ana-Celeste-Ximenes
authors.initials: AC
authors.lastname: Oliveira
authors.forename: Salvador
authors.initials: S
authors.lastname: Arias-Santiago
authors.forename: Antonio
authors.initials: A
authors.lastname: Campos
authors.forename: Maria-Carmen
authors.initials: MC
authors.lastname: Sánchez-Quevedo
authors.forename: Miguel
authors.initials: M
authors.lastname: Alaminos
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000494:pharmacology*; D057005:Bioengineering; D002478:Cells, Cultured; D020405:Dermis / Q000187:drug effects / Q000648:ultrastructure; D004817:Epidermis / Q000187:drug effects / Q000648:ultrastructure; D004847:Epithelial Cells / Q000166:cytology* / Q000187:drug effects / Q000648:ultrastructure; D005109:Extracellular Matrix / Q000187:drug effects / Q000378:metabolism; D005337:Fibrin / Q000494:pharmacology*; D005455:Fluorescent Antibody Technique; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000187:drug effects; D051379:Mice; D008819:Mice, Nude; D012685:Sepharose / Q000494:pharmacology*; D017768:Skin, Artificial; D017154:Stromal Cells / Q000166:cytology / Q000187:drug effects; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D001672:Biocompatible Materials; D005337:Fibrin; D012685:Sepharose