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Zielinska D, Fisch P, Moehrlen U, Finkielsztein S, Linder T, Zenobi-Wong M, Biedermann T, Klar AS. Combining bioengineered human skin with bioprinted cartilage for ear reconstruction. SCIENCE ADVANCES 2023; 9:eadh1890. [PMID: 37792948 PMCID: PMC10550230 DOI: 10.1126/sciadv.adh1890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 09/01/2023] [Indexed: 10/06/2023]
Abstract
Microtia is a congenital disorder that manifests as a malformation of the external ear leading to psychosocial problems in affected children. Here, we present a tissue-engineered treatment approach based on a bioprinted autologous auricular cartilage construct (EarCartilage) combined with a bioengineered human pigmented and prevascularized dermo-epidermal skin substitute (EarSkin) tested in immunocompromised rats. We confirmed that human-engineered blood capillaries of EarSkin connected to the recipient's vasculature within 1 week, enabling rapid blood perfusion and epidermal maturation. Bioengineered EarSkin displayed a stratified epidermis containing mature keratinocytes and melanocytes. The latter resided within the basal layer of the epidermis and efficiently restored the skin color. Further, in vivo tests demonstrated favorable mechanical stability of EarCartilage along with enhanced extracellular matrix deposition. In conclusion, EarCartilage combined with EarSkin represents a novel approach for the treatment of microtia with the potential to circumvent existing limitations and improve the aesthetic outcome of microtia reconstruction.
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Affiliation(s)
- Dominika Zielinska
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - Philipp Fisch
- Tissue Engineering and Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zurich, Switzerland
| | - Ueli Moehrlen
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | | | - Thomas Linder
- Klinik für Hals-, Nasen-, Ohren- und Gesichtschirurgie, Luzerner Kantonsspital, Luzern, Switzerland
| | - Marcy Zenobi-Wong
- Tissue Engineering and Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zurich, Switzerland
| | - Thomas Biedermann
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - Agnes S. Klar
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
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Chen X, Laurent A, Liao Z, Jaccoud S, Abdel-Sayed P, Flahaut M, Scaletta C, Raffoul W, Applegate LA, Hirt-Burri N. Cutaneous Cell Therapy Manufacturing Timeframe Rationalization: Allogeneic Off-the-Freezer Fibroblasts for Dermo-Epidermal Combined Preparations (DE-FE002-SK2) in Burn Care. Pharmaceutics 2023; 15:2334. [PMID: 37765300 PMCID: PMC10536166 DOI: 10.3390/pharmaceutics15092334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/07/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023] Open
Abstract
Autologous cell therapy manufacturing timeframes constitute bottlenecks in clinical management pathways of severe burn patients. While effective temporary wound coverings exist for high-TBSA burns, any means to shorten the time-to-treatment with cytotherapeutic skin grafts could provide substantial therapeutic benefits. This study aimed to establish proofs-of-concept for a novel combinational cytotherapeutic construct (autologous/allogeneic DE-FE002-SK2 full dermo-epidermal graft) designed for significant cutaneous cell therapy manufacturing timeframe rationalization. Process development was based on several decades (four for autologous protocols, three for allogeneic protocols) of in-house clinical experience in cutaneous cytotherapies. Clinical grade dermal progenitor fibroblasts (standardized FE002-SK2 cell source) were used as off-the-freezer substrates in novel autologous/allogeneic dermo-epidermal bilayer sheets. Under vitamin C stimulation, FE002-SK2 primary progenitor fibroblasts rapidly produced robust allogeneic dermal templates, allowing patient keratinocyte attachment in co-culture. Notably, FE002-SK2 primary progenitor fibroblasts significantly outperformed patient fibroblasts for collagen deposition. An ex vivo de-epidermalized dermis model was used to demonstrate the efficient DE-FE002-SK2 construct bio-adhesion properties. Importantly, the presented DE-FE002-SK2 manufacturing process decreased clinical lot production timeframes from 6-8 weeks (standard autologous combined cytotherapies) to 2-3 weeks. Overall, these findings bear the potential to significantly optimize burn patient clinical pathways (for rapid wound closure and enhanced tissue healing quality) by combining extensively clinically proven cutaneous cell-based technologies.
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Affiliation(s)
- Xi Chen
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
| | - Alexis Laurent
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
- Manufacturing Department, TEC-PHARMA SA, CH-1038 Bercher, Switzerland
- Manufacturing Department, LAM Biotechnologies SA, CH-1066 Epalinges, Switzerland
| | - Zhifeng Liao
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
| | - Sandra Jaccoud
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
- Laboratory of Biomechanical Orthopedics, Federal Polytechnic School of Lausanne, CH-1015 Lausanne, Switzerland
| | - Philippe Abdel-Sayed
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
- STI School of Engineering, Federal Polytechnic School of Lausanne, CH-1015 Lausanne, Switzerland
- Lausanne Burn Center, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland
| | - Marjorie Flahaut
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
- Lausanne Burn Center, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland
| | - Corinne Scaletta
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
| | - Wassim Raffoul
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
- Lausanne Burn Center, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland
| | - Lee Ann Applegate
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
- Lausanne Burn Center, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland
- Center for Applied Biotechnology and Molecular Medicine, University of Zurich, CH-8057 Zurich, Switzerland
- Oxford OSCAR Suzhou Center, Oxford University, Suzhou 215123, China
| | - Nathalie Hirt-Burri
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (X.C.); (A.L.); (Z.L.); (S.J.); (P.A.-S.); (M.F.); (C.S.); (W.R.)
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Immunomodulation of Skin Repair: Cell-Based Therapeutic Strategies for Skin Replacement (A Comprehensive Review). Biomedicines 2022; 10:biomedicines10010118. [PMID: 35052797 PMCID: PMC8773777 DOI: 10.3390/biomedicines10010118] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 12/30/2021] [Accepted: 12/31/2021] [Indexed: 12/12/2022] Open
Abstract
The immune system has a crucial role in skin wound healing and the application of specific cell-laden immunomodulating biomaterials emerged as a possible treatment option to drive skin tissue regeneration. Cell-laden tissue-engineered skin substitutes have the ability to activate immune pathways, even in the absence of other immune-stimulating signals. In particular, mesenchymal stem cells with their immunomodulatory properties can create a specific immune microenvironment to reduce inflammation, scarring, and support skin regeneration. This review presents an overview of current wound care techniques including skin tissue engineering and biomaterials as a novel and promising approach. We highlight the plasticity and different roles of immune cells, in particular macrophages during various stages of skin wound healing. These aspects are pivotal to promote the regeneration of nonhealing wounds such as ulcers in diabetic patients. We believe that a better understanding of the intrinsic immunomodulatory features of stem cells in implantable skin substitutes will lead to new translational opportunities. This, in turn, will improve skin tissue engineering and regenerative medicine applications.
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Abstract
As the largest organ in the human body, the skin has the function of maintaining balance and protecting from external factors such as bacteria, chemicals, and temperature. If the wound does not heal in time after skin damage, it may cause infection or life-threatening complications. In particular, medical treatment of large skin defects caused by burns or trauma remains challenging. Therefore, human bioengineered skin substitutes represent an alternative approach to treat such injuries. Based on the chemical composition and scaffold material, skin substitutes can be classified into acellular or cellular grafts, as well as natural-based or synthetic skin substitutes. Further, they can be categorized as epidermal, dermal, and composite grafts, based on the skin component they contain. This review presents the common commercially available skin substitutes and their clinical use. Moreover, the choice of an appropriate hydrogel type to prepare cell-laden skin substitutes is discussed. Additionally, we present recent advances in the field of bioengineered human skin substitutes using three-dimensional (3D) bioprinting techniques. Finally, we discuss different skin substitute developments to meet different criteria for optimal wound healing.
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Advanced Hydrogels as Wound Dressings. Biomolecules 2020; 10:biom10081169. [PMID: 32796593 PMCID: PMC7464761 DOI: 10.3390/biom10081169] [Citation(s) in RCA: 193] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 07/09/2020] [Accepted: 07/15/2020] [Indexed: 02/07/2023] Open
Abstract
Skin is the largest organ of the human body, protecting it against the external environment. Despite high self-regeneration potential, severe skin defects will not heal spontaneously and need to be covered by skin substitutes. Tremendous progress has been made in the field of skin tissue engineering, in recent years, to develop new skin substitutes. Among them, hydrogels are one of the candidates with most potential to mimic the native skin microenvironment, due to their porous and hydrated molecular structure. They can be applied as a permanent or temporary dressing for different wounds to support the regeneration and healing of the injured epidermis, dermis, or both. Based on the material used for their fabrication, hydrogels can be subdivided into two main groups—natural and synthetic. Moreover, hydrogels can be reinforced by incorporating nanoparticles to obtain “in situ” hybrid hydrogels, showing superior properties and tailored functionality. In addition, different sensors can be embedded in hydrogel wound dressings to provide real-time information about the wound environment. This review focuses on the most recent developments in the field of hydrogel-based skin substitutes for skin replacement. In particular, we discuss the synthesis, fabrication, and biomedical application of novel “smart” hydrogels.
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Chatzopoulos K, Gutierrez CN, Garcia JJ, Stokken JK, Choby G, O'Brien EK. Sinonasal mucosal vasculature in yellow nail syndrome and chronic rhinosinusitis with or without polyps. Int Forum Allergy Rhinol 2019; 10:128-132. [DOI: 10.1002/alr.22446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 08/20/2019] [Accepted: 09/10/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Kyriakos Chatzopoulos
- Division of Anatomic Pathology, Department of Laboratory Medicine and PathologyMayo Clinic Rochester MN
| | | | - Joaquin J. Garcia
- Division of Anatomic Pathology, Department of Laboratory Medicine and PathologyMayo Clinic Rochester MN
| | - Janalee K. Stokken
- Department of Otorhinolaryngology–Head and Neck SurgeryMayo Clinic Rochester MN
| | - Garret Choby
- Department of Otorhinolaryngology–Head and Neck SurgeryMayo Clinic Rochester MN
| | - Erin K. O'Brien
- Department of Otorhinolaryngology–Head and Neck SurgeryMayo Clinic Rochester MN
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Induction of angiogenic and inflammation-associated dermal biomarkers following acute UVB exposure on bio-engineered pigmented dermo-epidermal skin substitutes in vivo. Pediatr Surg Int 2019; 35:129-136. [PMID: 30430280 DOI: 10.1007/s00383-018-4384-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/18/2018] [Indexed: 12/26/2022]
Abstract
PURPOSE Ultraviolet (UV) radiation adversely affects skin health at cellular and molecular levels. Hence, UV radiation can directly induce inflammatory responses in the dermis by inducing erythema, edema, inflammation, dermal fibroblasts alterations, and extracellular matrix modifications. METHODS Human keratinocytes, melanocytes, and fibroblasts were isolated from skin biopsies, cultured, and expanded in vitro. Fibroblasts were seeded into collagen type I hydrogels that were subsequently covered by keratinocytes and melanocytes. These pigmented dermo-epidermal skin substitutes (pigmDESS) were transplanted for 5 weeks onto full-thickness skin wounds on the back of immuno-incompetent rats, exposed to a single UVB dose of 250 mJ/cm2 or unexposed and excised after 1 week. The effects onto the dermis were assessed regarding cell number, cell phenotype, and cell proliferation. Local inflammation by granulocytes (HIS48) or macrophages (CD11b, iNOS) was analyzed by immunohistochemistry staining. RESULTS We observed a significantly enhanced ingrowth rate of blood capillaries, but not of lymphatic capillaries at 1 week post-irradiation. Moreover, the enhanced vascularization of pigmDESS after UVB exposure was concomitant with a high infiltration of granulocytes and monocytes/macrophages to the dermal part of grafts. In addition, a heterogeneous expression of HIF-1α and TNFα was detected at this early phase after UVB exposure. In local cellular response examination, results only show a moderate cell proliferation in the dermis. CONCLUSIONS We were able to define early markers of UVB-induced effects in the dermis of pigmDESS. Overall, a single UVB dose induces temporary acute angiogenic and immune responses during the early post-irradiation phase in vivo.
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Klar AS, Michalak-Mićka K, Biedermann T, Simmen-Meuli C, Reichmann E, Meuli M. Characterization of M1 and M2 polarization of macrophages in vascularized human dermo-epidermal skin substitutes in vivo. Pediatr Surg Int 2018; 34:129-135. [PMID: 29124400 DOI: 10.1007/s00383-017-4179-z] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/21/2017] [Indexed: 10/18/2022]
Abstract
AIMS AND OBJECTIVES Vascularized bio-engineered human dermo-epidermal skin substitutes (vascDESS) hold promise for treating burn patients, including those with severe full-thickness wounds. We have previously shown that vascDESS promote wound healing by enhanced influx of macrophages and granulocytes. Immediately following transplantation, macrophages infiltrate the graft and differentiate into a pro-inflammatory (M1) or a pro-healing M2 phenotype. The aim of this study was to characterize the activation state of macrophages infiltrating skin transplants at distinct time points following transplantation. METHODS Keratinocytes and the stromal vascular fraction (SVF) were derived from human skin or adipose tissue, respectively. Human SVF containing both endothelial and mesenchymal/stromal cells was used to generate vascularized dermal component in vitro, which was subsequently covered with human keratinocytes. Finally, vascDESS were transplanted on the back of immuno-incompetent rats, excised, and analyzed after 1 and 3 weeks using immunohistological techniques. RESULTS A panel of markers of macrophage M1 (nitric oxide synthase: iNOS) and M2 (CD206) subclass was used. All skin grafts were infiltrated by both M1 and M2 rat macrophages between 1-3 weeks post-transplantation. CD68 (PG-M1) was used as a pan-macrophage marker. The number of CD68+CD206+ M2-polarized macrophages was higher in 3-week transplants as compared to early-stage transplants (1 week). In contrast, the number of CD68+iNOS+ M1 cells was markedly decreased in later stages in vivo. CONCLUSIONS Macrophages exhibit a heterogeneous and temporally regulated polarization during skin wound healing. Our results suggest that the phenotype of macrophages changes during healing from a more pro-inflammatory (M1) profile in early stages after injury, to a less inflammatory, pro-healing (M2) phenotype in later phases in vivo.
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Affiliation(s)
- Agnes S Klar
- Tissue Biology Research Unit, University Children's Hospital Zurich, August Forel Str. 7, 8008, Zurich, Switzerland. .,Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland.
| | - Katarzyna Michalak-Mićka
- Tissue Biology Research Unit, University Children's Hospital Zurich, August Forel Str. 7, 8008, Zurich, Switzerland.,Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Thomas Biedermann
- Tissue Biology Research Unit, University Children's Hospital Zurich, August Forel Str. 7, 8008, Zurich, Switzerland.,Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Claudia Simmen-Meuli
- Department of Plastic, Reconstructive, Esthetical and Hand Surgery, Kantonsspital Aarau, Aarau, Switzerland
| | - Ernst Reichmann
- Tissue Biology Research Unit, University Children's Hospital Zurich, August Forel Str. 7, 8008, Zurich, Switzerland.,Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Martin Meuli
- Department of Surgery, University Children's Hospital Zurich, Zurich, Switzerland.,Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
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Klar AS, Biedermann T, Simmen-Meuli C, Reichmann E, Meuli M. Comparison of in vivo immune responses following transplantation of vascularized and non-vascularized human dermo-epidermal skin substitutes. Pediatr Surg Int 2017; 33:377-382. [PMID: 27999947 DOI: 10.1007/s00383-016-4031-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/05/2016] [Indexed: 11/25/2022]
Abstract
PURPOSE Autologous bio-engineered dermo-epidermal skin substitutes (DESS) represent an alternative therapeutic option for a definitive treatment of skin defects in human patients. Largely, the interaction of host immune cells with transplanted DESS is considered to be essential for the granulation tissue formation, graft take, and its functionality. The aim of this study was to compare the spatiotemporal distribution and density of host-derived monocytes/macrophages and granulocytes in vascularized (vascDESS) versus non-vascularized DESS (non-vascDESS) in a rat model. METHODS Keratinocytes and the stromal vascular fraction (SVF) were derived from human skin or human adipose tissue, respectively. Human SVF containing both endothelial and mesenchymal/stromal progenitors was used to develop a vascularized collagen type I-based dermal component in vitro. The donor-matched, monolayer-expanded adipose stromal cells lacking endothelial cells were used as a negative control. Subsequently, human keratinocytes were seeded on top of hydrogels to build dermo-epidermal skin grafts. After transplantation onto full-thickness skin wounds on the back of immuno-incompetent rats, grafts were excised and analyzed after 1 and 3 weeks. The expression of distinct inflammatory cell markers specific for host-derived monocytes/macrophages (CD11b, CD68) or granulocytes (HIS48) was analyzed by immunofluorescence microscopy. RESULTS All skin grafts were infiltrated by host-derived monocytes/macrophages (CD11b+, CD68+) and granulocytes (HIS48+) between 1-3 week post-transplantation. When compared to non-vascDESS, the vascDESS showed an increased granulocyte infiltration at all time points analyzed with the majority of cells scattered throughout the whole dermal part. Whereas a moderate number of rat monocytes/macrophages (CD11b+, CD68+) were found in vascDESS at 1 week, only a few cells were detected in non-vascDESS. We observed a time-dependent decrease of monocytes/macrophages in all transplants at 3 weeks. CONCLUSIONS These results demonstrate a distinct spatiotemporal distribution of monocytes/macrophages as well as granulocytes in our transplants that closely resemble the one observed during physiological wound healing. The differences identified between vascDESS and non-vascDESS may indicate that human endothelial cells lining blood capillaries of vascDESS accelerate infiltration of monocytes and leukocytes.
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Affiliation(s)
- Agnes S Klar
- Tissue Biology Research Unit, University Children's Hospital Zurich, Zurich, Switzerland
- Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Thomas Biedermann
- Tissue Biology Research Unit, University Children's Hospital Zurich, Zurich, Switzerland
- Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Claudia Simmen-Meuli
- Department of Plastic, Reconstructive, Aesthetical, and Hand Surgery, Kantonsspital Aarau, Aarau, Switzerland
| | - Ernst Reichmann
- Tissue Biology Research Unit, University Children's Hospital Zurich, Zurich, Switzerland
- Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Martin Meuli
- Department of Surgery, University Children's Hospital Zurich, Steinwiesstrasse 75, 8032, Zurich, Switzerland.
- Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland.
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The Effect of Wound Dressings on a Bio-Engineered Human Dermo-Epidermal Skin Substitute in a Rat Model. J Burn Care Res 2017; 38:354-364. [DOI: 10.1097/bcr.0000000000000530] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Engineered Polymeric Hydrogels for 3D Tissue Models. Polymers (Basel) 2016; 8:polym8010023. [PMID: 30979118 PMCID: PMC6432530 DOI: 10.3390/polym8010023] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/04/2016] [Accepted: 01/15/2016] [Indexed: 12/11/2022] Open
Abstract
Polymeric biomaterials are widely used in a wide range of biomedical applications due to their unique properties, such as biocompatibility, multi-tunability and easy fabrication. Specifically, polymeric hydrogel materials are extensively utilized as therapeutic implants and therapeutic vehicles for tissue regeneration and drug delivery systems. Recently, hydrogels have been developed as artificial cellular microenvironments because of the structural and physiological similarity to native extracellular matrices. With recent advances in hydrogel materials, many researchers are creating three-dimensional tissue models using engineered hydrogels and various cell sources, which is a promising platform for tissue regeneration, drug discovery, alternatives to animal models and the study of basic cell biology. In this review, we discuss how polymeric hydrogels are used to create engineered tissue constructs. Specifically, we focus on emerging technologies to generate advanced tissue models that precisely recapitulate complex native tissues in vivo.
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Biedermann T, Böttcher-Haberzeth S, Klar AS, Widmer DS, Pontiggia L, Weber AD, Weber DM, Schiestl C, Meuli M, Reichmann E. The influence of stromal cells on the pigmentation of tissue-engineered dermo-epidermal skin grafts. Tissue Eng Part A 2015; 21:960-9. [PMID: 25300246 DOI: 10.1089/ten.tea.2014.0327] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
It has been shown in vitro that melanocyte proliferation and function in palmoplantar skin is regulated by mesenchymal factors derived from fibroblasts. In this study, we investigated in vivo the influence of mesenchymal-epithelial interactions in human tissue-engineered skin substitutes reconstructed from palmar- and nonpalmoplantar-derived fibroblasts. Tissue-engineered dermo-epidermal analogs based on collagen type I hydrogels were populated with either human palmar or nonpalmoplantar fibroblasts and seeded with human nonpalmoplantar-derived melanocytes and keratinocytes. These skin substitutes were transplanted onto full-thickness skin wounds of immunoincompetent rats. Four weeks after transplantation the development of skin color was measured and grafts were excised and analyzed with regard to epidermal characteristics, in particular melanocyte number and function. Skin substitutes containing palmar-derived fibroblasts in comparison to nonpalmoplantar-derived fibroblasts showed (a) a significantly lighter pigmentation; (b) a reduced amount of epidermal melanin granules; and (c) a distinct melanosome expression. However, the number of melanocytes in the basal layer remained similar in both transplantation groups. These findings demonstrate that human palmar fibroblasts regulate the function of melanocytes in human pigmented dermo-epidermal skin substitutes after transplantation, whereas the number of melanocytes remains constant. This underscores the influence of site-specific stromal cells and their importance when constructing skin substitutes for clinical application.
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Affiliation(s)
- Thomas Biedermann
- 1 Tissue Biology Research Unit, University Children's Hospital Zurich , Zurich, Switzerland
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Li Z, Yuan B, Dong X, Duan L, Tian H, He C, Chen X. Injectable polysaccharide hybrid hydrogels as scaffolds for burn wound healing. RSC Adv 2015. [DOI: 10.1039/c5ra16912g] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this study, the polysaccharide-based hydrogels were prepared by Schiff base reaction. Then, the hydrogels were applied to a burn wound model of rats, following by skin regeneration.
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Affiliation(s)
- Ziyi Li
- School of Chemistry and Life Science
- Changchun University of Technology
- Changchun 130012
- P. R. China
- Key Laboratory of Polymer Ecomaterials
| | - Baoming Yuan
- Department of Orthopaedics
- The Second Hospital of Jilin University
- Changchun 130041
- P. R. China
| | - Xiaoming Dong
- Department of Orthopaedics
- The Second Hospital of Jilin University
- Changchun 130041
- P. R. China
| | - Lijie Duan
- School of Chemistry and Life Science
- Changchun University of Technology
- Changchun 130012
- P. R. China
| | - Huayu Tian
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Chaoliang He
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
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Klar AS, Böttcher-Haberzeth S, Biedermann T, Michalak K, Kisiel M, Reichmann E, Meuli M. Differential expression of granulocyte, macrophage, and hypoxia markers during early and late wound healing stages following transplantation of tissue-engineered skin substitutes of human origin. Pediatr Surg Int 2014; 30:1257-64. [PMID: 25326120 DOI: 10.1007/s00383-014-3616-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/07/2014] [Indexed: 10/24/2022]
Abstract
PURPOSE Human pigmented tissue-engineered skin substitutes represent an advanced therapeutic option to treat skin defects. The inflammatory response is one of the major factors determining integration and long-term survival of such a graft in vivo. The aim of the present study was to investigate the spatiotemporal distribution of host-derived macrophage and granulocyte graft infiltration as well as hypoxia-inducible factor 1 alpha (HIF-1-alpha) expression in a (nu/nu) rat model. METHODS Keratinocytes, melanocytes, and fibroblasts derived from human skin biopsies were isolated, cultured, and expanded in vitro. Dermal fibroblasts were seeded into collagen type I hydrogels that were subsequently covered by keratinocytes and melanocytes in 5:1 ratio. These pigmented dermo-epidermal skin substitutes were transplanted onto full-thickness skin wounds on the back of immuno-incompetent rats and analyzed at early (1 and 3 weeks) and late (6 and 12 weeks) stages of wound healing. The expression of distinct inflammatory cell markers specific for granulocytes (HIS48) or macrophages (CD11b, CD68), as well as HIF-1-alpha were analyzed and quantified by immunofluorescence microscopy. RESULTS Our data demonstrate that granulocytes infiltrate the entire graft at 1 week post-transplantation. This was followed by monocyte/macrophage recruitment to the graft at 3-12 weeks. The macrophages were initially restricted to the borders of the graft (early stages), and were then found throughout the entire graft (late stages). We observed a time-dependent decrease of macrophages. Only a few graft-infiltrating granulocytes were found between 6-12 weeks, mostly at the graft borders. A heterogeneous expression of HIF-1-alpha was observed at both early and late wound healing stages. CONCLUSIONS Our findings demonstrate the spatiotemporal distribution of inflammatory cells in our transplants closely resembles the one documented for physiological wound healing.
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Affiliation(s)
- Agnieszka S Klar
- Tissue Biology Research Unit, University Children's Hospital Zurich, Zurich, Switzerland
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Klar AS, Güven S, Biedermann T, Luginbühl J, Böttcher-Haberzeth S, Meuli-Simmen C, Meuli M, Martin I, Scherberich A, Reichmann E. Tissue-engineered dermo-epidermal skin grafts prevascularized with adipose-derived cells. Biomaterials 2014; 35:5065-78. [DOI: 10.1016/j.biomaterials.2014.02.049] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 02/23/2014] [Indexed: 01/04/2023]
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