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Bhar B, Das E, Manikumar K, Mandal BB. 3D Bioprinted Human Skin Model Recapitulating Native-Like Tissue Maturation and Immunocompetence as an Advanced Platform for Skin Sensitization Assessment. Adv Healthc Mater 2024:e2303312. [PMID: 38478847 DOI: 10.1002/adhm.202303312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 03/08/2024] [Indexed: 03/28/2024]
Abstract
Physiologically-relevant in vitro skin models hold the utmost importance for efficacy assessments of pharmaceutical and cosmeceutical formulations, offering valuable alternatives to animal testing. Here, an advanced immunocompetent 3D bioprinted human skin model is presented to assess skin sensitization. Initially, a photopolymerizable bioink is formulated using silk fibroin methacrylate, gelatin methacrylate, and photoactivated human platelet releasate. The developed bioink shows desirable physicochemical and rheological attributes for microextrusion bioprinting. The tunable physical and mechanical properties of bioink are modulated through variable photocuring time for optimization. Thereafter, the bioink is utilized to 3D bioprint "sandwich type" skin construct where an artificial basement membrane supports a biomimetic epidermal layer on one side and a printed pre-vascularized dermal layer on the other side within a transwell system. The printed construct is further cultured in the air-liquid interface for maturation. Immunofluorescence staining demonstrated a differentiated keratinocyte layer and dermal extracellular matrix (ECM)-remodeling by fibroblasts and endothelial cells. The biochemical estimations and gene-expression analysis validate the maturation of the printed model. The incorporation of macrophages further enhances the physiological relevance of the model. This model effectively classifies skin irritative and non-irritative substances, thus establishing itself as a suitable pre-clinical screening platform for sensitization tests.
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Affiliation(s)
- Bibrita Bhar
- Biomaterials and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Eshani Das
- Biomaterials and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Kodieswaran Manikumar
- Biomaterials and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Biman B Mandal
- Biomaterials and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
- Jyoti and Bhupat Mehta School of Health Sciences and Technology, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
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2
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Hoerst A, Hermann M, Mewes KR, Steinmeyer L, Buchholzer M. Apparent limitations of OECD TG 431 for classification of acrylic- and methacrylic-based adhesives. Toxicol In Vitro 2024; 94:105700. [PMID: 37751785 DOI: 10.1016/j.tiv.2023.105700] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 09/03/2023] [Accepted: 09/22/2023] [Indexed: 09/28/2023]
Abstract
For years, the strive for in vitro methods for toxicological assessment suitable to replace animal studies gained progressive importance. OECD Test Guideline (TG) 431 was implemented in 2004, allowing to circumvent animal testing according to OECD TG 404 while reliably predicting skin corrosion potential of many substances and products. However, non-animal assays often show protocol-dependent limitations, that complicate or even prevent the testing of several groups of substances. In this study, the suitability of the OECD TG 431 for assessment of the skin corrosion potential of known acidic, thus often skin corrosive or irritating acrylic and methacrylic acid-based adhesives and monomers, was investigated. The commercially available Phenion® Open Source Reconstructed Epidermis (OS-REp) model, developed at Henkel & Co. KGaA, was used. The EpiDerm™ prediction model was considered most applicable to the Phenion® OS-REp model. All Proficiency Substances listed in OECD TG 431, amongst them six acids, were correctly classified and subcategorized as Skin Corr. 1 A or 1B/C corrosives. The OS-REp model was shown to be suitable for the assessment of skin corrosion potential in accordance with OECD TG 431. However, our results also indicate that acrylic and methacrylic monomer-based adhesives might fall outside the applicability domain of this guideline.
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Affiliation(s)
- A Hoerst
- Henkel AG & Co. KGaA, Henkelstraße 67, 40589 Duesseldorf, Germany.
| | - M Hermann
- Henkel AG & Co. KGaA, Henkelstraße 67, 40589 Duesseldorf, Germany
| | - K R Mewes
- Henkel AG & Co. KGaA, Henkelstraße 67, 40589 Duesseldorf, Germany
| | - L Steinmeyer
- Henkel AG & Co. KGaA, Henkelstraße 67, 40589 Duesseldorf, Germany
| | - M Buchholzer
- Henkel AG & Co. KGaA, Henkelstraße 67, 40589 Duesseldorf, Germany.
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3
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Wedekind R, Fischer A, Mewes KR, Brenneisen P, Holtkötter O. Investigating the surfactant antagonism with the Open Source Reconstructed Epidermis (OS-Rep) model. Toxicol In Vitro 2023; 88:105557. [PMID: 36681289 DOI: 10.1016/j.tiv.2023.105557] [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: 06/21/2022] [Revised: 12/11/2022] [Accepted: 01/15/2023] [Indexed: 01/20/2023]
Abstract
Under the current EU chemicals legislation, in vitro test methods became the preferred methods to identify and classify the skin irritation potential of chemicals and mixtures. Among these, especially in vitro skin models are widely used. For surfactants, a well-known group of typically irritating chemicals, it is a long-standing experience that the irritation potential of a mixture of surfactants is typically lower than the irritation potential of the single surfactants, an effect usually described as surfactant antagonism. In order to evaluate if this effect can be observed in skin model systems as well, the irritation potential of the surfactants and of their mixtures was determined in the Open Source Reconstructed Epidermis (OS-REp) models. Combinations of sodium dodecyl sulfate or linear alkylbenzene sulfonate with cocoamidopropyl betain and alkyl polyglycosid, respectively, resulted in a clear decrease of the irritation potential compared to the irritation exerted by the single surfactants. The effect appeared to be primarily driven by the mixture's lower ability to damage the skin model's barrier, as shown by a reduced fluorescein permeation.
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Affiliation(s)
| | | | | | - Peter Brenneisen
- Institute of Biochemistry & Molecular Biology I, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
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4
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Hofmann E, Schwarz A, Fink J, Kamolz LP, Kotzbeck P. Modelling the Complexity of Human Skin In Vitro. Biomedicines 2023; 11:biomedicines11030794. [PMID: 36979772 PMCID: PMC10045055 DOI: 10.3390/biomedicines11030794] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/17/2023] [Accepted: 02/19/2023] [Indexed: 03/08/2023] Open
Abstract
The skin serves as an important barrier protecting the body from physical, chemical and pathogenic hazards as well as regulating the bi-directional transport of water, ions and nutrients. In order to improve the knowledge on skin structure and function as well as on skin diseases, animal experiments are often employed, but anatomical as well as physiological interspecies differences may result in poor translatability of animal-based data to the clinical situation. In vitro models, such as human reconstructed epidermis or full skin equivalents, are valuable alternatives to animal experiments. Enormous advances have been achieved in establishing skin models of increasing complexity in the past. In this review, human skin structures are described as well as the fast evolving technologies developed to reconstruct the complexity of human skin structures in vitro.
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Affiliation(s)
- Elisabeth Hofmann
- COREMED—Centre of Regenerative and Precision Medicine, JOANNEUM RESEARCH Forschungsgesellschaft, 8010 Graz, Austria
- Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
- Research Unit for Tissue Regeneration, Repair and Reconstruction, Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
| | - Anna Schwarz
- COREMED—Centre of Regenerative and Precision Medicine, JOANNEUM RESEARCH Forschungsgesellschaft, 8010 Graz, Austria
- Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
- Research Unit for Tissue Regeneration, Repair and Reconstruction, Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
| | - Julia Fink
- COREMED—Centre of Regenerative and Precision Medicine, JOANNEUM RESEARCH Forschungsgesellschaft, 8010 Graz, Austria
- Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
- Research Unit for Tissue Regeneration, Repair and Reconstruction, Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
| | - Lars-Peter Kamolz
- COREMED—Centre of Regenerative and Precision Medicine, JOANNEUM RESEARCH Forschungsgesellschaft, 8010 Graz, Austria
- Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
| | - Petra Kotzbeck
- COREMED—Centre of Regenerative and Precision Medicine, JOANNEUM RESEARCH Forschungsgesellschaft, 8010 Graz, Austria
- Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
- Research Unit for Tissue Regeneration, Repair and Reconstruction, Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, 8036 Graz, Austria
- Correspondence:
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Wallenwein CM, Weigel V, Hofhaus G, Dhakal N, Schatton W, Gelperina S, Groeber-Becker FK, Dressman J, Wacker MG. Pharmaceutical Development of Nanostructured Vesicular Hydrogel Formulations of Rifampicin for Wound Healing. Int J Mol Sci 2022; 23:ijms232416207. [PMID: 36555855 PMCID: PMC9788359 DOI: 10.3390/ijms232416207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022] Open
Abstract
Chronic wounds exhibit elevated levels of inflammatory cytokines, resulting in the release of proteolytic enzymes which delay wound-healing processes. In recent years, rifampicin has gained significant attention in the treatment of chronic wounds due to an interesting combination of antibacterial and anti-inflammatory effects. Unfortunately, rifampicin is sensitive to hydrolysis and oxidation. As a result, no topical drug product for wound-healing applications has been approved. To address this medical need two nanostructured hydrogel formulations of rifampicin were developed. The liposomal vesicles were embedded into hydroxypropyl methylcellulose (HPMC) gel or a combination of hyaluronic acid and marine collagen. To protect rifampicin from degradation in aqueous environments, a freeze-drying method was developed. Before freeze-drying, two well-defined hydrogel preparations were obtained. After freeze-drying, the visual appearance, chemical stability, residual moisture content, and redispersion time of both preparations were within acceptable limits. However, the morphological characterization revealed an increase in the vesicle size for collagen-hyaluronic acid hydrogel. This was confirmed by subsequent release studies. Interactions of marine collagen with phosphatidylcholine were held responsible for this effect. The HPMC hydrogel formulation remained stable over 6 months of storage. Moving forward, this product fulfills all criteria to be evaluated in preclinical and clinical studies.
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Affiliation(s)
- Chantal M. Wallenwein
- Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Theodor-Stern-Kai 7, 60596 Frankfurt am Main, Germany
| | - Verena Weigel
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany
| | - Götz Hofhaus
- Cryo Electron Microscopy, CellNetworks, BioQuant, Universitätsklinikum Heidelberg, 69120 Heidelberg, Germany
| | - Namrata Dhakal
- Department of Pharmacy, Faculty of Science, National University of Singapore, 4 Science Drive 2, Singapore 117544, Singapore
| | | | - Svetlana Gelperina
- Faculty of Chemical and Pharmaceutical Technologies and Biomedical Drugs, D. Mendeleev University of Chemical Technology of Russia, Miusskaya pl. 9, 125047 Moscow, Russia
| | - Florian K. Groeber-Becker
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany
| | - Jennifer Dressman
- Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Theodor-Stern-Kai 7, 60596 Frankfurt am Main, Germany
| | - Matthias G. Wacker
- Department of Pharmacy, Faculty of Science, National University of Singapore, 4 Science Drive 2, Singapore 117544, Singapore
- Correspondence:
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In Model, In Vitro and In Vivo Killing Efficacy of Antitumor Peptide RDP22 on MUG-Mel2, a Patient Derived Cell Line of an Aggressive Melanoma Metastasis. Biomedicines 2022; 10:biomedicines10112961. [PMID: 36428530 PMCID: PMC9687695 DOI: 10.3390/biomedicines10112961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 11/07/2022] [Accepted: 11/14/2022] [Indexed: 11/19/2022] Open
Abstract
The host defense derived peptide was assessed in different model systems with increasing complexity employing the highly aggressive NRAS mutated melanoma metastases cell line MUG-Mel2. Amongst others, fluorescence microscopy and spectroscopy, as well as cell death studies were applied for liposomal, 2D and 3D in vitro models including tumor spheroids without or within skin models and in vivo mouse xenografts. Summarized, MUG-Mel2 cells were shown to significantly expose the negatively charged lipid phosphatidylserine on their plasma membranes, showing they are successfully targeted by RDP22. The peptide was able to induce cell death in MUG-Mel2 2D and 3D cultures, where it was able to kill tumor cells even inside the core of tumor spheroids or inside a melanoma organotypic model. In vitro studies indicated cell death by apoptosis upon peptide treatment with an LC50 of 8.5 µM and seven-fold specificity for the melanoma cell line MUG-Mel2 over normal dermal fibroblasts. In vivo studies in mice xenografts revealed effective tumor regression upon intratumoral peptide injection, indicated by the strong clearance of pigmented tumor cells and tremendous reduction in tumor size and proliferation, which was determined histologically. The peptide RDP22 has clearly shown high potential against the melanoma cell line MUG-Mel2 in vitro and in vivo.
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7
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Gagosian VS, Claro FC, Schwarzer ACDA, Cruz JV, Thá EL, Trindade EDS, Magalhães WL, Pestana CB, Leme DM. The potential use of kraft lignins as natural ingredients for cosmetics: Evaluating their photoprotective activity and skin irritation potential. Int J Biol Macromol 2022; 222:2535-2544. [DOI: 10.1016/j.ijbiomac.2022.10.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 09/29/2022] [Accepted: 10/06/2022] [Indexed: 11/05/2022]
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8
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A preclinical model of cutaneous melanoma based on reconstructed human epidermis. Sci Rep 2022; 12:16269. [PMID: 36175453 PMCID: PMC9522649 DOI: 10.1038/s41598-022-19307-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 08/26/2022] [Indexed: 11/08/2022] Open
Abstract
Malignant melanoma is among the tumor entities with the highest increase of incidence worldwide. To elucidate melanoma progression and develop new effective therapies, rodent models are commonly used. While these do not adequately reflect human physiology, two-dimensional cell cultures lack crucial elements of the tumor microenvironment. To address this shortcoming, we have developed a melanoma skin equivalent based on an open-source epidermal model. Melanoma cell lines with different driver mutations were incorporated into these models forming distinguishable tumor aggregates within a stratified epidermis. Although barrier properties of the skin equivalents were not affected by incorporation of melanoma cells, their presence resulted in a higher metabolic activity indicated by an increased glucose consumption. Furthermore, we re-isolated single cells from the models to characterize the proliferation state within the respective model. The applicability of our model for tumor therapeutics was demonstrated by treatment with a commonly used v-raf murine sarcoma viral oncogene homolog B (BRAF) inhibitor vemurafenib. This selective BRAF inhibitor successfully reduced tumor growth in the models harboring BRAF-mutated melanoma cells. Hence, our model is a promising tool to investigate melanoma development and as a preclinical model for drug discovery.
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9
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Chu CC, Hasan ZAA, Tan CP, Nyam KL. In vitro safety evaluation of sunscreen formulation from nanostructured lipid carriers using human cells and skin model. Toxicol In Vitro 2022; 84:105431. [PMID: 35809791 DOI: 10.1016/j.tiv.2022.105431] [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: 03/14/2022] [Revised: 07/01/2022] [Accepted: 07/04/2022] [Indexed: 11/16/2022]
Abstract
There is a risk of toxicological reactions due to systemic absorption and photo-instability of sunscreens. The study aimed to investigate the safety profile (cytotoxicity, phototoxicity, photostability, UV filter release profile, and skin irritation properties) of sunscreen (NLC-TRF sunscreen) produced from nanostructured lipid carriers (NLCs) and tocotrienol-rich fraction (TRF). The cytotoxicity and phototoxicity of the sunscreen were evaluated on normal human dermal fibroblast (NHDF) and skin irritation properties was tested on skin model. Besides, the photoprotection in pre- and post-UV irradiation were analysed to determine the photostability. Additionally, the release profile for UV filters (diethylamino hydroxybenzoyl hexyl benzoate (DHHB) and ethylhexyl triazone (EHT)) were evaluated. The NLC-TRF sunscreen demonstrated no cytotoxicity and skin irritation to cause cell death. It showed no phototoxic effect and high photostability up to 10 Minimal Erythema Dose (MED) to ensure high SPF value above 50 and broad-spectrum of UV absorption. The NLC-TRF sunscreen implies its safety for topical application with sustainable release profile for UV filter (cumulative release of 28% for DHHB and 40% for EHT after 8 h) due to the application of NLCs. The results suggest that the NLC-TRF sunscreen is an advanced formulation with improved stability and is safe for topical delivery.
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Affiliation(s)
- Chee Chin Chu
- Faculty of Applied Sciences, UCSI University, 56000 Kuala Lumpur, Malaysia
| | - Zafarizal Aldrin Azizul Hasan
- Advanced Oleochemical Technology Division, Malaysian Palm Oil Board, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Chin Ping Tan
- Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Kar Lin Nyam
- Faculty of Applied Sciences, UCSI University, 56000 Kuala Lumpur, Malaysia.
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Schneider V, Kruse D, de Mattos IB, Zöphel S, Tiltmann KK, Reigl A, Khan S, Funk M, Bodenschatz K, Groeber-Becker F. A 3D In Vitro Model for Burn Wounds: Monitoring of Regeneration on the Epidermal Level. Biomedicines 2021; 9:1153. [PMID: 34572338 PMCID: PMC8466997 DOI: 10.3390/biomedicines9091153] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/21/2021] [Accepted: 08/27/2021] [Indexed: 01/13/2023] Open
Abstract
Burns affect millions every year and a model to mimic the pathophysiology of such injuries in detail is required to better understand regeneration. The current gold standard for studying burn wounds are animal models, which are under criticism due to ethical considerations and a limited predictiveness. Here, we present a three-dimensional burn model, based on an open-source model, to monitor wound healing on the epidermal level. Skin equivalents were burned, using a preheated metal cylinder. The healing process was monitored regarding histomorphology, metabolic changes, inflammatory response and reepithelialization for 14 days. During this time, the wound size decreased from 25% to 5% of the model area and the inflammatory response (IL-1β, IL-6 and IL-8) showed a comparable course to wounding and healing in vivo. Additionally, the topical application of 5% dexpanthenol enhanced tissue morphology and the number of proliferative keratinocytes in the newly formed epidermis, but did not influence the overall reepithelialization rate. In summary, the model showed a comparable healing process to in vivo, and thus, offers the opportunity to better understand the physiology of thermal burn wound healing on the keratinocyte level.
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Affiliation(s)
- Verena Schneider
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, 97070 Würzburg, Germany; (D.K.); (I.B.d.M.); (S.Z.); (K.-K.T.); (A.R.); (F.G.-B.)
- Translational Center for Regenerative Therapies TLC-RT, Fraunhofer-Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany
| | - Daniel Kruse
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, 97070 Würzburg, Germany; (D.K.); (I.B.d.M.); (S.Z.); (K.-K.T.); (A.R.); (F.G.-B.)
| | - Ives Bernardelli de Mattos
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, 97070 Würzburg, Germany; (D.K.); (I.B.d.M.); (S.Z.); (K.-K.T.); (A.R.); (F.G.-B.)
- QRSkin GmbH, Friedrich-Bergius-Ring 15, 97076 Würzburg, Germany
| | - Saskia Zöphel
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, 97070 Würzburg, Germany; (D.K.); (I.B.d.M.); (S.Z.); (K.-K.T.); (A.R.); (F.G.-B.)
- Translational Center for Regenerative Therapies TLC-RT, Fraunhofer-Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany
| | - Kendra-Kathrin Tiltmann
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, 97070 Würzburg, Germany; (D.K.); (I.B.d.M.); (S.Z.); (K.-K.T.); (A.R.); (F.G.-B.)
- Translational Center for Regenerative Therapies TLC-RT, Fraunhofer-Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany
| | - Amelie Reigl
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, 97070 Würzburg, Germany; (D.K.); (I.B.d.M.); (S.Z.); (K.-K.T.); (A.R.); (F.G.-B.)
- Translational Center for Regenerative Therapies TLC-RT, Fraunhofer-Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany
| | - Sarah Khan
- Department for Paediatric Surgery, Nuremberg Hospital, Breslauer Straße 201, 90471 Nürnberg, Germany; (S.K.); (K.B.)
| | - Martin Funk
- EVOMEDIS GmbH, Neue Stiftingtalstrasse 2, 8010 Graz, Austria;
| | - Karl Bodenschatz
- Department for Paediatric Surgery, Nuremberg Hospital, Breslauer Straße 201, 90471 Nürnberg, Germany; (S.K.); (K.B.)
| | - Florian Groeber-Becker
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, 97070 Würzburg, Germany; (D.K.); (I.B.d.M.); (S.Z.); (K.-K.T.); (A.R.); (F.G.-B.)
- Translational Center for Regenerative Therapies TLC-RT, Fraunhofer-Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany
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11
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Kakar A, Holzknecht J, Dubrac S, Gelmi ML, Romanelli A, Marx F. New Perspectives in the Antimicrobial Activity of the Amphibian Temporin B: Peptide Analogs Are Effective Inhibitors of Candida albicans Growth. J Fungi (Basel) 2021; 7:457. [PMID: 34200504 PMCID: PMC8226839 DOI: 10.3390/jof7060457] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/31/2021] [Accepted: 05/31/2021] [Indexed: 12/30/2022] Open
Abstract
Temporin B (TB) is a short, positively charged peptide secreted by the granular glands of the European frog Rana temporaria. While the antibacterial and antiviral efficacy of TB and some of its improved analogs are well documented, nothing is known about their antifungal potency so far. We dedicated this study to characterize the antifungal potential of the TB analog TB_KKG6K and the newly designed D-Lys_TB_KKG6K, the latter having the L-lysines replaced by the chiral counterpart D-lysines to improve its proteolytic stability. Both peptides inhibited the growth of opportunistic human pathogenic yeasts and killed planktonic and sessile cells of the most prevalent human pathogen, Candida albicans. The anti-yeast efficacy of the peptides coincided with the induction of intracellular reactive oxygen species. Their thermal, cation, pH and serum tolerance were similar, while the proteolytic stability of D-Lys_TB_KKG6K was superior to that of its template peptide. Importantly, both peptides lacked hemolytic activity and showed minimal in vitro cytotoxicity in primary human keratinocytes. The tolerance of both peptides in a reconstructed human epidermis model further supports their potential for topical application. Our results open up an exciting field of research for new anti-Candida therapeutic options based on amphibian TB analogs.
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Affiliation(s)
- Anant Kakar
- Biocenter, Institute of Molecular Biology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (A.K.); (J.H.)
| | - Jeanett Holzknecht
- Biocenter, Institute of Molecular Biology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (A.K.); (J.H.)
| | - Sandrine Dubrac
- Department of Dermatology, Venerology and Allergy, Medical University of Innsbruck, A-6020 Innsbruck, Austria;
| | - Maria Luisa Gelmi
- Department of Pharmaceutical Sciences, University of Milan, I-20133 Milano, Italy;
| | - Alessandra Romanelli
- Department of Pharmaceutical Sciences, University of Milan, I-20133 Milano, Italy;
| | - Florentine Marx
- Biocenter, Institute of Molecular Biology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (A.K.); (J.H.)
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12
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Krishnan V, Peng K, Sarode A, Prakash S, Zhao Z, Filippov SK, Todorova K, Sell BR, Lujano O, Bakre S, Pusuluri A, Vogus D, Tsai KY, Mandinova A, Mitragotri S. Hyaluronic acid conjugates for topical treatment of skin cancer lesions. SCIENCE ADVANCES 2021; 7:7/24/eabe6627. [PMID: 34117055 PMCID: PMC8195472 DOI: 10.1126/sciadv.abe6627] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Accepted: 04/23/2021] [Indexed: 05/31/2023]
Abstract
Skin cancer is one of the most common types of cancer in the United States and worldwide. Topical products are effective for treating cancerous skin lesions when surgery is not feasible. However, current topical products induce severe irritation, light-sensitivity, burning, scaling, and inflammation. Using hyaluronic acid (HA), we engineered clinically translatable polymer-drug conjugates of doxorubicin and camptothecin termed, DOxorubicin and Camptothecin Tailored at Optimal Ratios (DOCTOR) for topical treatment of skin cancers. When compared to the clinical standard, Efudex, DOCTOR exhibited high cancer-cell killing specificity with superior safety to healthy skin cells. In vivo studies confirmed its efficacy in treating cancerous lesions without irritation or systemic absorption. When tested on patient-derived primary cells and live-skin explants, DOCTOR killed the cancer with a selectivity as high as 21-fold over healthy skin tissue from the same donor. Collectively, DOCTOR provides a safe and potent option for treating skin cancer in the clinic.
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Affiliation(s)
- Vinu Krishnan
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| | - Kevin Peng
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| | - Apoorva Sarode
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| | - Supriya Prakash
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| | - Zongmin Zhao
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| | - Sergey K Filippov
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Kristina Todorova
- Cutaneous Biology Research Center, Massachusetts General Hospital and Harvard Medical School, Building 149 13th Street, Charlestown, MA 02129, USA
| | - Brittney R Sell
- Departments of Anatomic Pathology and Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - Omar Lujano
- Department of Molecular, Cellular, and Developmental Biology (MCDB), University of California, Santa Barbara, Santa Barbara, CA 93117, USA
| | - Shirin Bakre
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Anusha Pusuluri
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| | - Douglas Vogus
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
| | - Kenneth Y Tsai
- Departments of Anatomic Pathology and Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - Anna Mandinova
- Cutaneous Biology Research Center, Massachusetts General Hospital and Harvard Medical School, Building 149 13th Street, Charlestown, MA 02129, USA
- Broad Institute of Harvard and MIT, 7 Cambridge Center, MA 02142, USA
- Harvard Stem Cell Institute, 7 Divinity Avenue, Cambridge, MA 02138, USA
| | - Samir Mitragotri
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA
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13
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Delacher M, Simon M, Sanderink L, Hotz-Wagenblatt A, Wuttke M, Schambeck K, Schmidleithner L, Bittner S, Pant A, Ritter U, Hehlgans T, Riegel D, Schneider V, Groeber-Becker FK, Eigenberger A, Gebhard C, Strieder N, Fischer A, Rehli M, Hoffmann P, Edinger M, Strowig T, Huehn J, Schmidl C, Werner JM, Prantl L, Brors B, Imbusch CD, Feuerer M. Single-cell chromatin accessibility landscape identifies tissue repair program in human regulatory T cells. Immunity 2021; 54:702-720.e17. [PMID: 33789089 PMCID: PMC8050210 DOI: 10.1016/j.immuni.2021.03.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 10/05/2020] [Accepted: 03/10/2021] [Indexed: 02/07/2023]
Abstract
Murine regulatory T (Treg) cells in tissues promote tissue homeostasis and regeneration. We sought to identify features that characterize human Treg cells with these functions in healthy tissues. Single-cell chromatin accessibility profiles of murine and human tissue Treg cells defined a conserved, microbiota-independent tissue-repair Treg signature with a prevailing footprint of the transcription factor BATF. This signature, combined with gene expression profiling and TCR fate mapping, identified a population of tissue-like Treg cells in human peripheral blood that expressed BATF, chemokine receptor CCR8 and HLA-DR. Human BATF+CCR8+ Treg cells from normal skin and adipose tissue shared features with nonlymphoid T follicular helper-like (Tfh-like) cells, and induction of a Tfh-like differentiation program in naive human Treg cells partially recapitulated tissue Treg regenerative characteristics, including wound healing potential. Human BATF+CCR8+ Treg cells from healthy tissue share features with tumor-resident Treg cells, highlighting the importance of understanding the context-specific functions of these cells.
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Affiliation(s)
- Michael Delacher
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany; Institute of Immunology, University Medical Center Mainz, 55131 Mainz, Germany; Research Centre for Immunotherapy, University Medical Center Mainz, 55131 Mainz, Germany
| | - Malte Simon
- Faculty of Biosciences, Heidelberg University, 69120 Heidelberg, Germany; Division of Applied Bioinformatics, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Lieke Sanderink
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Agnes Hotz-Wagenblatt
- Core Facility Omics IT and Data management (ODCF), German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Marina Wuttke
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Kathrin Schambeck
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Lisa Schmidleithner
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Sebastian Bittner
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Asmita Pant
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Uwe Ritter
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Thomas Hehlgans
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany
| | - Dania Riegel
- Regensburg Center for Interventional Immunology (RCI)
| | - Verena Schneider
- University Hospital Würzburg, Department of Tissue Engineering and Regenerative Medicine TERM, 97070 Würzburg, Germany; Fraunhofer Institute for Silicate Research ISC, Translational Center for Regenerative Therapies TLZ-RT, 97082 Würzburg, Germany
| | - Florian Kai Groeber-Becker
- University Hospital Würzburg, Department of Tissue Engineering and Regenerative Medicine TERM, 97070 Würzburg, Germany; Fraunhofer Institute for Silicate Research ISC, Translational Center for Regenerative Therapies TLZ-RT, 97082 Würzburg, Germany
| | - Andreas Eigenberger
- Department of Plastic, Hand- and Reconstructive Surgery, University Hospital Regensburg, 93053 Regensburg, Germany
| | | | | | - Alexander Fischer
- Regensburg Center for Interventional Immunology (RCI); Department of Internal Medicine III, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Michael Rehli
- Regensburg Center for Interventional Immunology (RCI); Department of Internal Medicine III, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Petra Hoffmann
- Regensburg Center for Interventional Immunology (RCI); Department of Internal Medicine III, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Matthias Edinger
- Regensburg Center for Interventional Immunology (RCI); Department of Internal Medicine III, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Till Strowig
- Department of Microbial Immune Regulation, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany; Hannover Medical School, 30625 Hannover, Germany; RESIST, Cluster of Excellence 2155, Hannover Medical School, 30625 Hannover, Germany
| | - Jochen Huehn
- Department of Experimental Immunology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany; RESIST, Cluster of Excellence 2155, Hannover Medical School, 30625 Hannover, Germany
| | | | - Jens M Werner
- Department of Surgery, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Lukas Prantl
- Department of Plastic, Hand- and Reconstructive Surgery, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Benedikt Brors
- Division of Applied Bioinformatics, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany; National Center for Tumor Diseases (NCT), 69120 Heidelberg, Germany; German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Charles D Imbusch
- Division of Applied Bioinformatics, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Markus Feuerer
- Regensburg Center for Interventional Immunology (RCI); Chair for Immunology, University Regensburg, 93053 Regensburg, Germany.
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Matarrese P, Beauchef G, Peno-Mazzarino L, Lati E, Fitoussi R, Vié K. Assessment of an ex vivo irritation test performed on human skin explants and comparison of its results with those of a 24-/48-h human patch test for the evaluation of cosmetics. Toxicol In Vitro 2021; 70:105030. [DOI: 10.1016/j.tiv.2020.105030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 09/19/2020] [Accepted: 10/10/2020] [Indexed: 11/29/2022]
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15
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Pereira MN, Tolentino S, Pires FQ, Anjos JL, Alonso A, Gratieri T, Cunha-Filho M, Gelfuso GM. Nanostructured lipid carriers for hair follicle-targeted delivery of clindamycin and rifampicin to hidradenitis suppurativa treatment. Colloids Surf B Biointerfaces 2021; 197:111448. [DOI: 10.1016/j.colsurfb.2020.111448] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 10/22/2020] [Accepted: 10/31/2020] [Indexed: 01/30/2023]
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16
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do Nascimento Pedrosa T, Catarino CM, Pennacchi PC, de Moraes Barros SB, Maria-Engler SS. Skin Equivalent Models: Protocols for In Vitro Reconstruction for Dermal Toxicity Evaluation. Methods Mol Biol 2021; 2240:31-41. [PMID: 33423224 DOI: 10.1007/978-1-0716-1091-6_3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
This chapter presents the protocols for developing of skin equivalents (SE) and reconstructed human epidermis (RHE) models for dermal toxicity evaluation as an alternative method to animal use in research. It provides a detailed protocol for the in vitro reconstruction of human skin from primary keratinocytes, melanocytes, and fibroblasts obtained from foreskin biopsies, including the procedures for reconstruction of a stratified epidermis on a polyester membrane. SE and RHE developed through these methods have been proven suitable not only for dermal toxicity studies, but also for investigating of pathological conditions in the skin, such as diabetes and invasion of melanoma.
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Affiliation(s)
- Tatiana do Nascimento Pedrosa
- Skin Biology and Melanoma Laboratory, School of Pharmaceutical Sciences, University of São Paulo, Butantã, SP, Brazil
| | - Carolina Motter Catarino
- Skin Biology and Melanoma Laboratory, School of Pharmaceutical Sciences, University of São Paulo, Butantã, SP, Brazil
| | - Paula Comune Pennacchi
- Skin Biology and Melanoma Laboratory, School of Pharmaceutical Sciences, University of São Paulo, Butantã, SP, Brazil
| | | | - Silvya Stuchi Maria-Engler
- Skin Biology and Melanoma Laboratory, School of Pharmaceutical Sciences, University of São Paulo, Butantã, SP, Brazil.
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17
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De Jong WH, Carraway JW, Liu C, Fan C, Liu J, Turley AP, Rollins TS, Coleman KP. The suitability of reconstructed human epidermis models for medical device irritation assessment: A comparison of In Vitro and In Vivo testing results. Toxicol In Vitro 2020; 69:104995. [PMID: 32891721 DOI: 10.1016/j.tiv.2020.104995] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 08/24/2020] [Accepted: 09/01/2020] [Indexed: 11/19/2022]
Abstract
The ISO 10993 standards on biocompatibility assessment of medical devices discourage the use of animal tests when reliable and validated in vitro methods are available. A round robin validation study of in vitro reconstructed human epidermis (RhE) assays was performed as potential replacements for rabbit skin irritation testing. The RhE assays were able to accurately identify strong irritants in dilute medical device extracts. However, there was some uncertainty about whether RhE tissues accurately predicted the results of the rabbit skin patch or intracutaneous irritation test. To address that question, this paper presents in vivo data from the round robin and subsequent follow-up studies. The follow-up studies included simultaneous in vitro RhE model and in vivo testing of round robin polymer samples and the results of dual in vitro/in vivo testing of currently marketed medical device components/materials. Our results show for the first time that for both pure chemicals and medical device extracts the intracutaneous rabbit test is more sensitive to detect irritant activity than the rabbit skin patch test. The studies showed that the RhE models produced results that were essentially equivalent to those from the intracutaneous rabbit skin irritation test. Therefore, it is concluded that RhE in vitro models are acceptable replacements for the in vivo rabbit intracutaneous irritation test for evaluating the irritant potential of medical devices.
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Affiliation(s)
- Wim H De Jong
- Formerly National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands (retired).
| | | | - Chenghu Liu
- Shandong Quality Inspection Center for Medical Devices, National Medical Products Administration, Jinan, China.
| | - Chunguang Fan
- Shandong Quality Inspection Center for Medical Devices, National Medical Products Administration, Jinan, China.
| | - Jia Liu
- Shandong Quality Inspection Center for Medical Devices, National Medical Products Administration, Jinan, China.
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18
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Dähnhardt D, Dähnhardt-Pfeiffer S, Groeber-Becker F, Fölster-Holst R, Schmidt M. Epidermal Regeneration Induced by Comfrey Extract: A Study by Light and Electron Microscopy. Skin Pharmacol Physiol 2020; 33:189-197. [PMID: 32683369 DOI: 10.1159/000509121] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 05/30/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION An accelerated healing of superficial wounds was demonstrated in clinical trials with a topical comfrey preparation (Symphytum × uplandicum Nyman). The effect has previously not been examined in skin models. METHODS An established in vitro model of epidermal cells with the typical strata was used for the observation of effects of applied substances on skin regeneration. Damage corresponding to a typical abrasion was created on day 1 by punching an opening into the epidermal fine structure down to the stratum basale. Samples were either untreated (controls) or exposed to comfrey cream on days 2, 3, 5, and 6. Tissue samples were taken for light and electron microscopy on days 1, 4, and 7. RESULTS AND CONCLUSIONS Application of comfrey cream led to a quicker regeneration of skin cells and to an earlier differentiation of the cells towards a normal fine structure with a visible distinction of epidermal strata, keratin, and corneocyte formation within 4-7 days. The study covered the early days of skin regeneration and confirms the benefits observed in published clinical trials and non-interventional studies in patients with abrasions.
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Affiliation(s)
| | | | - Florian Groeber-Becker
- Translationszentrum Regenerative Therapien, Fraunhofer Institut für Silikatforschung ISC, Würzburg, Germany
| | - Regina Fölster-Holst
- Campus Kiel, Klinik für Dermatologie, Venerologie und Allergologie, Universitätsklinikum Schleswig-Holstein, Kiel, Germany
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19
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Schmidt FF, Nowakowski S, Kluger PJ. Improvement of a Three-Layered in vitro Skin Model for Topical Application of Irritating Substances. Front Bioeng Biotechnol 2020; 8:388. [PMID: 32457884 PMCID: PMC7225271 DOI: 10.3389/fbioe.2020.00388] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 04/07/2020] [Indexed: 12/23/2022] Open
Abstract
In the field of skin tissue engineering, the development of physiologically relevant in vitro skin models comprising all skin layers, namely epidermis, dermis, and subcutis, is a great challenge. Increasing regulatory requirements and the ban on animal experiments for substance testing demand the development of reliable and in vivo-like test systems, which enable high-throughput screening of substances. However, the reproducibility and applicability of in vitro testing has so far been insufficient due to fibroblast-mediated contraction. To overcome this pitfall, an advanced 3-layered skin model was developed. While the epidermis of standard skin models showed an 80% contraction, the initial epidermal area of our advanced skin models was maintained. The improved barrier function of the advanced models was quantified by an indirect barrier function test and a permeability assay. Histochemical and immunofluorescence staining of the advanced model showed well-defined epidermal layers, a dermal part with distributed human dermal fibroblasts and a subcutis with round-shaped adipocytes. The successful response of these advanced 3-layered models for skin irritation testing demonstrated the suitability as an in vitro model for these clinical tests: only the advanced model classified irritative and non-irritative substances correctly. These results indicate that the advanced set up of the 3-layered in vitro skin model maintains skin barrier function and therefore makes them more suitable for irritation testing.
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Affiliation(s)
- Freia F Schmidt
- Reutlingen Research Institute, Reutlingen University, Reutlingen, Germany
| | - Sophia Nowakowski
- Reutlingen Research Institute, Reutlingen University, Reutlingen, Germany
| | - Petra J Kluger
- Reutlingen Research Institute, Reutlingen University, Reutlingen, Germany
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20
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Api AM, Belsito D, Biserta S, Botelho D, Bruze M, Burton GA, Buschmann J, Cancellieri MA, Dagli ML, Date M, Dekant W, Deodhar C, Fryer AD, Gadhia S, Jones L, Joshi K, Lapczynski A, Lavelle M, Liebler DC, Na M, O'Brien D, Patel A, Penning TM, Ritacco G, Rodriguez-Ropero F, Romine J, Sadekar N, Salvito D, Schultz TW, Siddiqi F, Sipes IG, Sullivan G, Thakkar Y, Tokura Y, Tsang S. RIFM fragrance ingredient safety assessment, 1-(5,5-dimethyl-1-cyclohexen-1-yl)pent-4-en-1-one, CAS Registry Number 56973-85-4. Food Chem Toxicol 2020; 138 Suppl 1:111266. [PMID: 32199965 DOI: 10.1016/j.fct.2020.111266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 02/14/2020] [Accepted: 03/13/2020] [Indexed: 11/17/2022]
Affiliation(s)
- A M Api
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - D Belsito
- Member Expert Panel, Columbia University Medical Center, Department of Dermatology, 161 Fort Washington Ave., New York, NY, 10032, USA
| | - S Biserta
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - D Botelho
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - M Bruze
- Member Expert Panel, Malmo University Hospital, Department of Occupational & Environmental Dermatology, Sodra Forstadsgatan 101, Entrance 47, Malmo, SE-20502, Sweden
| | - G A Burton
- Member Expert Panel, School of Natural Resources & Environment, University of Michigan, Dana Building G110, 440 Church St., Ann Arbor, MI, 58109, USA
| | - J Buschmann
- Member Expert Panel, Fraunhofer Institute for Toxicology and Experimental Medicine, Nikolai-Fuchs-Strasse 1, 30625, Hannover, Germany
| | - M A Cancellieri
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - M L Dagli
- Member Expert Panel, University of Sao Paulo, School of Veterinary Medicine and Animal Science, Department of Pathology, Av. Prof. dr. Orlando Marques de Paiva, 87, Sao Paulo, CEP 05508-900, Brazil
| | - M Date
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - W Dekant
- Member Expert Panel, University of Wuerzburg, Department of Toxicology, Versbacher Str. 9, 97078, Würzburg, Germany
| | - C Deodhar
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - A D Fryer
- Member Expert Panel, Oregon Health Science University, 3181 SW Sam Jackson Park Rd., Portland, OR, 97239, USA
| | - S Gadhia
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - L Jones
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - K Joshi
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - A Lapczynski
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - M Lavelle
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - D C Liebler
- Member Expert Panel, Vanderbilt University School of Medicine, Department of Biochemistry, Center in Molecular Toxicology, 638 Robinson Research Building, 2200 Pierce Avenue, Nashville, TN, 37232-0146, USA
| | - M Na
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - D O'Brien
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - A Patel
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - T M Penning
- Member of Expert Panel, University of Pennsylvania, Perelman School of Medicine, Center of Excellence in Environmental Toxicology, 1316 Biomedical Research Building (BRB) II/III, 421 Curie Boulevard, Philadelphia, PA, 19104-3083, USA
| | - G Ritacco
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - F Rodriguez-Ropero
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - J Romine
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - N Sadekar
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - D Salvito
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - T W Schultz
- Member Expert Panel, The University of Tennessee, College of Veterinary Medicine, Department of Comparative Medicine, 2407 River Dr., Knoxville, TN, 37996- 4500, USA
| | - F Siddiqi
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - I G Sipes
- Member Expert Panel, Department of Pharmacology, University of Arizona, College of Medicine, 1501 North Campbell Avenue, P.O. Box 245050, Tucson, AZ, 85724-5050, USA
| | - G Sullivan
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA.
| | - Y Thakkar
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
| | - Y Tokura
- Member Expert Panel, The Journal of Dermatological Science (JDS), Editor-in-Chief, Professor and Chairman, Department of Dermatology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, 431-3192, Japan
| | - S Tsang
- Research Institute for Fragrance Materials, Inc., 50 Tice Boulevard, Woodcliff Lake, NJ, 07677, USA
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21
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Development of an in-house reconstructed human epidermis model as an alternative method in skin corrosion assessment. Toxicol In Vitro 2020; 65:104779. [PMID: 31962200 DOI: 10.1016/j.tiv.2020.104779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/14/2020] [Accepted: 01/17/2020] [Indexed: 11/21/2022]
Abstract
Defining the corrosive properties of chemical products generally involves the use of animal models for human health safety assessment. However, a few alternatives to animal experimentation are currently internationally accepted in order to reduce animal suffering. One of these alternatives makes use of in vitro reconstructed human epidermis (RhE) models and predicts corrosive potential based on the evaluation of cell viability after topical exposure. These models rely on its similarity to human skin, both functional and histological, and are currently worldwide marketed by a few private companies. In this manuscript, we describe the fundamentals of the production of a Do It Yourself (DIY) RhE model, and the operating procedures for the assessment of skin corrosion based on the guidelines proposed for the development of new alternative methods for skin corrosion. Our results indicate that the DIY-RhE model resembles the anatomy of the normal human epidermis as seen by immunohistochemical analysis. Moreover, barrier properties of DIY-RhE were assessed by the measure of Transepithelial Electrical Resistance. Applicability of DIY-RhE for the assessment of skin corrosion was evaluated by measuring cell viability after topical exposure of twelve reference chemicals for 3 and 60 min. Predictive performance resulted in 100% sensitivity, 100% specificity and 100% accuracy matching current requirements for new RhE models proposed for the discrimination of corrosives and non-corrosives.
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22
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Kiesewetter L, Littau L, Walles H, Boccaccini AR, Groeber-Becker F. Reepithelialization in focus: Non-invasive monitoring of epidermal wound healing in vitro. Biosens Bioelectron 2019; 142:111555. [DOI: 10.1016/j.bios.2019.111555] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/26/2019] [Accepted: 07/29/2019] [Indexed: 01/10/2023]
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23
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Frings VG, Müller D, Storz G, Rossi A, Sennefelder H, Adam C, Goebeler M, Groeber-Becker FK, Schmidt M. Improved metal allergen reactivity of artificial skin models by integration of Toll-like receptor 4-positive cells. Contact Dermatitis 2019; 81:254-261. [PMID: 31198997 DOI: 10.1111/cod.13336] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 05/14/2019] [Accepted: 06/12/2019] [Indexed: 12/27/2022]
Abstract
BACKGROUND Reconstructed human epidermis (RhE) is widely used to replace animal models in order to assess the proinflammatory and allergenic effects of chemicals. Unfortunately, RhE lacks proinflammatory responsiveness for metal haptens, which are the most prevalent human contact allergens, raising concerns about its reliability for predicting skin allergens. OBJECTIVES To investigate whether this limitation of RhE might be attributable to a lack of functional expression of Toll-like receptor 4 (TLR4), which governs proinflammatory sensitivity to nickel and cobalt. MATERIALS AND METHODS RhE, dendritic cell (DC)-containing RhE and full-thickness skin equivalent (FTSE) were compared regarding their proinflammatory responsiveness to metal allergens. RESULTS The incorporation of dermal fibroblasts was sufficient to confer metal sensitivity to RhE. Unlike keratinocytes, normal human fibroblasts expressed high levels of TLR4 mRNA and induced interleukin-8 expression upon stimulation with nickel or cobalt. Consistently, dermal isolates from FTSE expressed considerable amounts of TLR4 mRNA, whereas RhE or epidermis isolated from FTSE, normal human epidermis or inflamed human epidermis failed to express TLR4. Similarly, co-culture with TLR4-positive DCs bestowed RhE with proinflammatory responsiveness to metals. CONCLUSION Our data suggest that FTSE or DC/RhE co-culture models can circumvent the shortcomings of RhE assays, and combine the benefits of complex and monoculture-based test systems in a single assay.
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Affiliation(s)
- Verena G Frings
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany
| | - Damaris Müller
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany
| | - Gabriel Storz
- Department of Tissue Engineering and Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, Germany
| | - Angela Rossi
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, Germany
| | - Helga Sennefelder
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany
| | - Christian Adam
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany
| | - Matthias Goebeler
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany
| | - Florian K Groeber-Becker
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, Germany.,Department of Tissue Engineering and Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, Germany
| | - Marc Schmidt
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany
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24
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Schellenberger MT, Bock U, Hennen J, Groeber-Becker F, Walles H, Blömeke B. A coculture system composed of THP-1 cells and 3D reconstructed human epidermis to assess activation of dendritic cells by sensitizing chemicals after topical exposure. Toxicol In Vitro 2019; 57:62-66. [DOI: 10.1016/j.tiv.2019.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 01/28/2019] [Accepted: 02/05/2019] [Indexed: 12/22/2022]
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25
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Effects of topical methotrexate loaded gold nanoparticle in cutaneous inflammatory mouse model. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2019; 17:276-286. [DOI: 10.1016/j.nano.2019.01.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 01/14/2019] [Accepted: 01/15/2019] [Indexed: 01/25/2023]
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26
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Lotz C, Kiesewetter L, Schmid FF, Hansmann J, Walles H, Groeber-Becker F. Replacing the Draize eye test: Impedance spectroscopy as a 3R method to discriminate between all GHS categories for eye irritation. Sci Rep 2018; 8:15049. [PMID: 30301970 PMCID: PMC6177390 DOI: 10.1038/s41598-018-33118-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 09/21/2018] [Indexed: 11/09/2022] Open
Abstract
Highly invasive animal based test procedures for risk assessment such as the Draize eye test are under increasing criticism due to poor transferability for the human organism and animal-welfare concerns. However, besides all efforts, the Draize eye test is still not completely replaced by alternative animal-free methods. To develop an in vitro test to identify all categories of eye irritation, we combined organotypic cornea models based on primary human cells with an electrical readout system that measures the impedance of the test models. First, we showed that employing a primary human cornea epithelial cell based model is advantageous in native marker expression to the primary human epidermal keratinocytes derived models. Secondly, by employing a non-destructive measuring system based on impedance spectroscopy, we could increase the sensitivity of the test system. Thereby, all globally harmonized systems categories of eye irritation could be identified by repeated measurements over a period of 7 days. Based on a novel prediction model we achieved an accuracy of 78% with a reproducibility of 88.9% to determine all three categories of eye irritation in one single test. This could pave the way according to the 3R principle to replace the Draize eye test.
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Affiliation(s)
- C Lotz
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany.
| | - L Kiesewetter
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany
| | - F F Schmid
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
| | - J Hansmann
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany.,Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
| | - H Walles
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany.,Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
| | - F Groeber-Becker
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
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27
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Ewart L, Dehne EM, Fabre K, Gibbs S, Hickman J, Hornberg E, Ingelman-Sundberg M, Jang KJ, Jones DR, Lauschke VM, Marx U, Mettetal JT, Pointon A, Williams D, Zimmermann WH, Newham P. Application of Microphysiological Systems to Enhance Safety Assessment in Drug Discovery. Annu Rev Pharmacol Toxicol 2017; 58:65-82. [PMID: 29029591 DOI: 10.1146/annurev-pharmtox-010617-052722] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Enhancing the early detection of new therapies that are likely to carry a safety liability in the context of the intended patient population would provide a major advance in drug discovery. Microphysiological systems (MPS) technology offers an opportunity to support enhanced preclinical to clinical translation through the generation of higher-quality preclinical physiological data. In this review, we highlight this technological opportunity by focusing on key target organs associated with drug safety and metabolism. By focusing on MPS models that have been developed for these organs, alongside other relevant in vitro models, we review the current state of the art and the challenges that still need to be overcome to ensure application of this technology in enhancing drug discovery.
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Affiliation(s)
- Lorna Ewart
- Drug Safety and Metabolism, Innovative Medicines and Early Development, AstraZeneca, Cambridge CB4 0WG, United Kingdom;
| | | | - Kristin Fabre
- Drug Safety and Metabolism, Innovative Medicines and Early Development, AstraZeneca, Waltham, Massachusetts 02451, USA
| | - Susan Gibbs
- Department of Dermatology, VU University Medical Center, 1081 HZ Amsterdam, The Netherlands.,Department of Oral Cell Biology, Academic Center for Dentistry Amsterdam, University of Amsterdam and VU University, 1081 LA Amsterdam, The Netherlands
| | - James Hickman
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, USA
| | - Ellinor Hornberg
- Drug Safety and Metabolism, Innovative Medicines and Early Development, AstraZeneca, 431 83 Mölndal, Sweden
| | - Magnus Ingelman-Sundberg
- Department of Physiology and Pharmacology, Section of Pharmacogenetics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | | | - David R Jones
- Medicines & Healthcare Products Regulatory Agency, London SW1W 9SZ, United Kingdom
| | - Volker M Lauschke
- Department of Physiology and Pharmacology, Section of Pharmacogenetics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | | | - Jerome T Mettetal
- Drug Safety and Metabolism, Innovative Medicines and Early Development, AstraZeneca, Waltham, Massachusetts 02451, USA
| | - Amy Pointon
- Drug Safety and Metabolism, Innovative Medicines and Early Development, AstraZeneca, Cambridge CB4 0WG, United Kingdom;
| | - Dominic Williams
- Drug Safety and Metabolism, Innovative Medicines and Early Development, AstraZeneca, Cambridge CB4 0WG, United Kingdom;
| | - Wolfram-Hubertus Zimmermann
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, Goettingen 37075, Germany.,German Center for Cardiovascular Research (DZHK), Goettingen 37075, Germany
| | - Peter Newham
- Drug Safety and Metabolism, Innovative Medicines and Early Development, AstraZeneca, Cambridge CB4 0WG, United Kingdom;
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28
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A new reconstructed human epidermis for in vitro skin irritation testing. Toxicol In Vitro 2017; 42:31-37. [PMID: 28344105 DOI: 10.1016/j.tiv.2017.03.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 03/21/2017] [Accepted: 03/22/2017] [Indexed: 01/07/2023]
Abstract
Different models of reconstructed human epidermis (RHE) are currently validated to assess skin irritation in vitro and ultimately to the animal replacement of the Draize test. The development of a new RHE model is a challenge for many laboratories, representing a potential gain of autonomy and improvement of technological knowledge. The Organization for Economic Co-operation and Development (OECD) encourages the development of new models and, for this purpose, offers a thorough guideline on quality control parameters (OECD TG 439 performance standards). This work aimed to develop an RHE model (i.e. USP-RHE) for in vitro skin irritation assays, following the OECD TG 439. The developed model presents a well-differentiated epidermis similar to the Validated Reference Methods (VRM) and to native human epidermis. Quality parameters, i.e. optical density of negative control, tissue integrity and barrier function, were similar to VRM and in accordance with OECD TG 439. Moreover, the USP-RHE model was shown to have 85,7% of specificity (6/7), 100% of sensitivity (6/6) and 92,3% of accuracy (12/13) when compared to in vivo UN GHS classification. The within-laboratory reproducibility was 92.3% (12/13). Thus, we demonstrated that USP-RHE model attends to all OECD TG 439 performance standards and is ready to be used by private and public laboratories and companies for future validation studies.
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29
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Planz V, Lehr CM, Windbergs M. In vitro models for evaluating safety and efficacy of novel technologies for skin drug delivery. J Control Release 2016; 242:89-104. [PMID: 27612408 DOI: 10.1016/j.jconrel.2016.09.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 08/22/2016] [Accepted: 09/05/2016] [Indexed: 12/14/2022]
Abstract
For preclinical testing of novel therapeutics, predictive in vitro models of the human skin are required to assess efficacy, absorption and safety. Simple as well as more sophisticated three-dimensional organotypic models of the human skin emerged as versatile and powerful tools simulating healthy as well as diseased skin states. Besides addressing the demands of research and industry, such models serve as valid alternative to animal testing. Recently, the acceptance of several models by regulatory authorities corroborates their role as important building block for preclinical development. However, valid assessment of readout parameters derived from these models requires suitable analytical techniques. Standard analytical methods are mostly destructive and limited regarding in-depth investigation on molecular level. The combination of adequate in vitro models with modern non-invasive analytical modalities bears a great potential to address important skin drug delivery related questions. Topics of interest are for instance the assessment of repeated dosing effects and xenobiotic biotransformation, which cannot be analyzed by destructive techniques. This review provides a comprehensive overview of current in vitro skin models differing in functional complexity and mimicking healthy as well as diseased skin states. Further, benefits and limitations regarding analytical evaluation of efficacy, absorption and safety of novel drug carrier systems applied to such models are discussed along with a prospective view of anticipated future directions. In addition, emerging non-invasive imaging modalities are introduced and their significance and potential to advance current knowledge in the field of skin drug delivery is explored.
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Affiliation(s)
- Viktoria Planz
- Helmholtz Centre for Infection Research (HZI), Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Department of Drug Delivery (DDEL), 66123 Saarbrücken, Germany; Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany; PharmBioTec GmbH, 66123 Saarbrücken, Germany
| | - Claus-Michael Lehr
- Helmholtz Centre for Infection Research (HZI), Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Department of Drug Delivery (DDEL), 66123 Saarbrücken, Germany; Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany; PharmBioTec GmbH, 66123 Saarbrücken, Germany
| | - Maike Windbergs
- Helmholtz Centre for Infection Research (HZI), Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Department of Drug Delivery (DDEL), 66123 Saarbrücken, Germany; Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany; PharmBioTec GmbH, 66123 Saarbrücken, Germany.
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