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Kaussikaa S, Prasad MK, Ramkumar KM. Nrf2 Activation in Keratinocytes: A Central Role in Diabetes-Associated Wound Healing. Exp Dermatol 2024; 33:e15189. [PMID: 39373525 DOI: 10.1111/exd.15189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 08/28/2024] [Accepted: 09/21/2024] [Indexed: 10/08/2024]
Abstract
Wound healing is a complex biological process crucial for tissue repair, wherein keratinocytes play a pivotal role in initiating, sustaining and completing the cascade. Various local and systemic factors, such as lifestyle, age metabolic disorders and vascular insufficiency, can influence this process, and in the context of diabetic wounds, disrupted biological mechanisms, including inflammation, tissue hypoxia, decrease in collagen production along with increased oxidative stress and keratinocyte dysfunction, contribute to delayed healing. During re-epithelialisation, keratinocytes undergo rapid multiplication and migration, forming a dense hyperproliferative epithelial layer that restores the epidermal barrier. Nuclear factor-erythroid 2-related factor (Nrf2), a vital transcription factor, emerges as a central regulator in managing antioxidant proteins and detoxifying enzymes, serving as a guardian against elevated reactive oxygen species (ROS) levels during stress. Nrf2 also orchestrates angiogenesis and anti-inflammatory responses crucial for wound repair. Studies demonstrate that under high-glucose conditions, Nrf2 activation promotes wound healing by enhancing cell proliferation and migration while reducing apoptosis. Nrf2 activators stimulate endogenous antioxidant production, thereby mitigating oxidative stress. Furthermore, Nrf2 upregulation is associated with decreased expression of cytokines such as TNF-α and IL- 6. Recent research underscores the potential of bioactive molecules, including dietary polyphenols, traditional medicinal compounds and pharmacological agents, in activating Nrf2 and preventing diseases such as diabetes due to their robust antioxidative properties. This review aims to investigate the activation of Nrf2 by these bioactive molecules in cultured keratinocytes and animal models, elucidating the key molecular regulatory mechanisms involved in alleviating oxidative stress and facilitating the diabetic wound healing process. Understanding these complex pathways may offer insights into novel therapeutic strategies for enhanced wound healing in diabetes-associated complications.
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Affiliation(s)
- Srinivasan Kaussikaa
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
| | - Murali Krishna Prasad
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
| | - Kunka Mohanram Ramkumar
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
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2
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de Paula NA, Leite MN, de Faria Bertoluci DF, Soares CT, Rosa PS, Frade MAC. Human Skin as an Ex Vivo Model for Maintaining Mycobacterium leprae and Leprosy Studies. Trop Med Infect Dis 2024; 9:135. [PMID: 38922047 PMCID: PMC11209558 DOI: 10.3390/tropicalmed9060135] [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: 05/04/2024] [Revised: 06/09/2024] [Accepted: 06/13/2024] [Indexed: 06/27/2024] Open
Abstract
The in vitro cultivation of M. leprae has not been possible since it was described as causing leprosy, and the limitation of animal models for clinical aspects makes studies on leprosy and bacteria-human host interaction a challenge. Our aim was to standardize the ex vivo skin model (hOSEC) to maintenance and study of M. leprae as an alternative animal model. Bacillary suspensions were inoculated into human skin explants and sustained in DMEM medium for 60 days. Explants were evaluated by RT-PCR-16SrRNA and cytokine gene expression. The viability and infectivity of bacilli recovered from explants (D28 and D60) were evaluated using the Shepard's model. All explants were RT-PCR-16SrRNA positive. The viability and infectivity of recovered bacilli from explants, analyzed after 5 months of inoculation in mice, showed an average positivity of 31%, with the highest positivity in the D28 groups (80%). Furthermore, our work showed different patterns in cytokine gene expression (TGF-β, IL-10, IL-8, and TNF-α) in the presence of alive or dead bacilli. Although changes can be made to improve future experiments, our results have demonstrated that it is possible to use the hOSEC to maintain M. leprae for 60 days, interacting with the host system, an important step in the development of experimental models for studies on the biology of the bacillus, its interactions, and drug susceptibility.
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Affiliation(s)
- Natália Aparecida de Paula
- Department of Cell and Molecular Biology and Pathogenic Bioagents, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto14049-900, Brazil;
- Dermatology Division, Department of Medical Clinics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, Brazil;
- Reference Center for Sanitary Dermatology with Emphasis on Leprosy, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, Brazil
| | - Marcel Nani Leite
- Dermatology Division, Department of Medical Clinics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, Brazil;
| | | | - Cleverson Teixeira Soares
- Department of Anatomic Pathology, Lauro de Souza Lima Institute, Bauru 17034-971, Brazil; (D.F.d.F.B.); (C.T.S.)
| | - Patrícia Sammarco Rosa
- Division of Research and Education, Lauro de Souza Lima Institute, Bauru 17034-971, Brazil;
| | - Marco Andrey Cipriani Frade
- Department of Cell and Molecular Biology and Pathogenic Bioagents, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto14049-900, Brazil;
- Dermatology Division, Department of Medical Clinics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, Brazil;
- Reference Center for Sanitary Dermatology with Emphasis on Leprosy, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, Brazil
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Strenge JT, Smeets R, Nemati F, Fuest S, Rhode SC, Stuermer EK. Biodegradable Silk Fibroin Matrices for Wound Closure in a Human 3D Ex Vivo Approach. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3004. [PMID: 38930373 PMCID: PMC11205513 DOI: 10.3390/ma17123004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Revised: 06/13/2024] [Accepted: 06/15/2024] [Indexed: 06/28/2024]
Abstract
In this study, the potential of silk fibroin biomaterials for enhancing wound healing is explored, focusing on their integration into a human 3D ex vivo wound model derived from abdominoplasties. For this purpose, cast silk fibroin membranes and electrospun nonwoven matrices from Bombyx mori silk cocoons were compared to untreated controls over 20 days. Keratinocyte behavior and wound healing were analyzed qualitatively and quantitatively by histomorphometric and immune histochemical methods (HE, Ki67, TUNEL). Findings reveal rapid keratinocyte proliferation on both silk fibroin membrane and nonwoven matrices, along with enhanced infiltration in the matrix, suggesting improved early wound closure. Silk fibroin membranes exhibited a significantly improved early regeneration, followed by nonwoven matrices (p < 0.05) compared to untreated wounds, resulting in the formation of multi-layered epidermal structures with complete regeneration. Overall, the materials demonstrated excellent biocompatibility, supporting cell activity with no signs of increased apoptosis or early degradation. These results underscore silk fibroin's potential in clinical wound care, particularly in tissue integration and re-epithelialization, offering valuable insights for advanced and-as a result of the electrospinning technique-individual wound care development. Furthermore, the use of an ex vivo wound model appears to be a viable option for pre-clinical testing.
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Affiliation(s)
- Jan Tinson Strenge
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.T.S.); (R.S.)
| | - Ralf Smeets
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.T.S.); (R.S.)
- Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.N.); (S.F.)
| | - Fateme Nemati
- Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.N.); (S.F.)
- Institute of Bioprocess and Biosystems Engineering, Hamburg University, 21073 Hamburg, Germany
| | - Sandra Fuest
- Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.N.); (S.F.)
| | - Sophie Charlotte Rhode
- Department of Plastic, Reconstructive and Aesthetic Surgery, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Ewa Klara Stuermer
- Department for Vascular Medicine, Translational Wound Research, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
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4
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Martin L, Simpson K, Brzezinski M, Watt J, Xu W. Cellular response of keratinocytes to the entry and accumulation of nanoplastic particles. Part Fibre Toxicol 2024; 21:22. [PMID: 38685063 PMCID: PMC11057139 DOI: 10.1186/s12989-024-00583-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 04/14/2024] [Indexed: 05/02/2024] Open
Abstract
Plastic accumulation in the environment is rapidly increasing, and nanoplastics (NP), byproducts of environmental weathering of bulk plastic waste, pose a significant public health risk. Particles may enter the human body through many possible routes such as ingestion, inhalation, and skin absorption. However, studies on NP penetration and accumulation in human skin are limited. Loss or reduction of the keratinized skin barrier may enhance the skin penetration of NPs. The present study investigated the entry of NPs into a human skin system modeling skin with compromised barrier functions and cellular responses to the intracellular accumulations of NPs. Two in vitro models were employed to simulate human skin lacking keratinized barriers. The first model was an ex vivo human skin culture with the keratinized dermal layer (stratum corneum) removed. The second model was a 3D keratinocyte/dermal fibroblast cell co-culture model with stratified keratinocytes on the top and a monolayer of skin fibroblast cells co-cultured at the bottom. The penetration and accumulation of the NPs in different cell types were observed using fluorescent microscopy, confocal microscopy, and cryogenic electron microscopy (cryo-EM). The cellular responses of keratinocytes and dermal fibroblast cells to stress induced by NPs stress were measured. The genetic regulatory pathway of keratinocytes to the intracellular NPs was identified using transcript analyses and KEGG pathway analysis. The cellular uptake of NPs by skin cells was confirmed by imaging analyses. Transepidermal transport and penetration of NPs through the skin epidermis were observed. According to the gene expression and pathway analyses, an IL-17 signaling pathway was identified as the trigger for cellular responses to internal NP accumulation in the keratinocytes. The transepidermal NPs were also found in co-cultured dermal fibroblast cells and resulted in a large-scale transition from fibroblast cells to myofibroblast cells with enhanced production of α-smooth muscle actin and pro-Collagen Ia. The upregulation of inflammatory factors and cell activation may result in skin inflammation and ultimately trigger immune responses.
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Affiliation(s)
- Leisha Martin
- Department of Life Sciences, College of Science, Texas A&M University - Corpus Christi, 6300 Ocean Dr, 78412, Corpus Christi, TX, USA
| | - Kayla Simpson
- Department of Life Sciences, College of Science, Texas A&M University - Corpus Christi, 6300 Ocean Dr, 78412, Corpus Christi, TX, USA
| | - Molly Brzezinski
- Department of Life Sciences, College of Science, Texas A&M University - Corpus Christi, 6300 Ocean Dr, 78412, Corpus Christi, TX, USA
| | - John Watt
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Albuquerque, NM, USA
| | - Wei Xu
- Department of Life Sciences, College of Science, Texas A&M University - Corpus Christi, 6300 Ocean Dr, 78412, Corpus Christi, TX, USA.
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5
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Sanjarnia P, Picchio ML, Polegre Solis AN, Schuhladen K, Fliss PM, Politakos N, Metterhausen L, Calderón M, Osorio-Blanco ER. Bringing innovative wound care polymer materials to the market: Challenges, developments, and new trends. Adv Drug Deliv Rev 2024; 207:115217. [PMID: 38423362 DOI: 10.1016/j.addr.2024.115217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/24/2024] [Accepted: 02/18/2024] [Indexed: 03/02/2024]
Abstract
The development of innovative products for treating acute and chronic wounds has become a significant topic in healthcare, resulting in numerous products and innovations over time. The growing number of patients with comorbidities and chronic diseases, which may significantly alter, delay, or inhibit normal wound healing, has introduced considerable new challenges into the wound management scenario. Researchers in academia have quickly identified promising solutions, and many advanced wound healing materials have recently been designed; however, their successful translation to the market remains highly complex and unlikely without the contribution of industry experts. This review article condenses the main aspects of wound healing applications that will serve as a practical guide for researchers working in academia and industry devoted to designing, evaluating, validating, and translating polymer wound care materials to the market. The article highlights the current challenges in wound management, describes the state-of-the-art products already on the market and trending polymer materials, describes the regulation pathways for approval, discusses current wound healing models, and offers a perspective on new technologies that could soon reach consumers. We envision that this comprehensive review will significantly contribute to highlighting the importance of networking and exchanges between academia and healthcare companies. Only through the joint of these two actors, where innovation, manufacturing, regulatory insights, and financial resources act in harmony, can wound care products be developed efficiently to reach patients quickly and affordably.
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Affiliation(s)
- Pegah Sanjarnia
- POLYMAT, Applied Chemistry Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizábal, 3, 20018 Donostia-San Sebastián, Spain
| | - Matías L Picchio
- POLYMAT, Applied Chemistry Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizábal, 3, 20018 Donostia-San Sebastián, Spain; Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), CONICET, Güemes 3450, Santa Fe 3000, Argentina
| | - Agustin N Polegre Solis
- Beiersdorf AG, Research & Development Department, Beiersdorfstraße 1-9, 22529 Hamburg, Germany
| | - Katharina Schuhladen
- Beiersdorf AG, Research & Development Department, Beiersdorfstraße 1-9, 22529 Hamburg, Germany
| | - Patricia M Fliss
- Beiersdorf AG, Research & Development Department, Beiersdorfstraße 1-9, 22529 Hamburg, Germany
| | - Nikolaos Politakos
- POLYMAT, Applied Chemistry Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizábal, 3, 20018 Donostia-San Sebastián, Spain
| | - Lutz Metterhausen
- Beiersdorf AG, Research & Development Department, Beiersdorfstraße 1-9, 22529 Hamburg, Germany
| | - Marcelo Calderón
- POLYMAT, Applied Chemistry Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizábal, 3, 20018 Donostia-San Sebastián, Spain; IKERBASQUE, Basque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Spain
| | - Ernesto R Osorio-Blanco
- Beiersdorf AG, Research & Development Department, Beiersdorfstraße 1-9, 22529 Hamburg, Germany.
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6
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Wang Z, Wu Z, Wang H, Feng R, Wang G, Li M, Wang SY, Chen X, Su Y, Wang J, Zhang W, Bao Y, Lan Z, Song Z, Wang Y, Luo X, Zhao L, Hou A, Tian S, Gao H, Miao W, Liu Y, Wang H, Yin C, Ji ZL, Feng M, Liu H, Diao L, Amit I, Chen Y, Zeng Y, Ginhoux F, Wu X, Zhu Y, Li H. An immune cell atlas reveals the dynamics of human macrophage specification during prenatal development. Cell 2023; 186:4454-4471.e19. [PMID: 37703875 DOI: 10.1016/j.cell.2023.08.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 05/26/2023] [Accepted: 08/17/2023] [Indexed: 09/15/2023]
Abstract
Macrophages are heterogeneous and play critical roles in development and disease, but their diversity, function, and specification remain inadequately understood during human development. We generated a single-cell RNA sequencing map of the dynamics of human macrophage specification from PCW 4-26 across 19 tissues. We identified a microglia-like population and a proangiogenic population in 15 macrophage subtypes. Microglia-like cells, molecularly and morphologically similar to microglia in the CNS, are present in the fetal epidermis, testicle, and heart. They are the major immune population in the early epidermis, exhibit a polarized distribution along the dorsal-lateral-ventral axis, and interact with neural crest cells, modulating their differentiation along the melanocyte lineage. Through spatial and differentiation trajectory analysis, we also showed that proangiogenic macrophages are perivascular across fetal organs and likely yolk-sac-derived as microglia. Our study provides a comprehensive map of the heterogeneity and developmental dynamics of human macrophages and unravels their diverse functions during development.
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Affiliation(s)
- Zeshuai Wang
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Zhisheng Wu
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; School of Chemistry and Chemical Engineering, Southeast University, Nanjing, China
| | - Hao Wang
- Maternal Fetal Medicine Institute, Department of Obstetrics and Gynaecology, Shenzhen Baoan Women's and Children's Hospital, Jinan University, Shenzhen, China
| | - Ruoqing Feng
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Guanlin Wang
- Shanghai Key Laboratory of Metabolic Remodeling and Health, Institute of Metabolism and Integrative Biology, Centre for Evolutionary Biology, Fudan University, Shanghai, China; Shanghai Qi Zhi Institute, Shanghai, China.
| | - Muxi Li
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen, China
| | - Shuang-Yin Wang
- Department of Systems Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Xiaoyan Chen
- Maternal Fetal Medicine Institute, Department of Obstetrics and Gynaecology, Shenzhen Baoan Women's and Children's Hospital, Jinan University, Shenzhen, China
| | - Yiyi Su
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Jun Wang
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Weiwen Zhang
- Department of Gynaecology & Obstetrics, Shenzhen University General Hospital, Shenzhen University, Shenzhen, China
| | - Yuzhou Bao
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen, China
| | - Zhenwei Lan
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen, China
| | - Zhuo Song
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; Maternal Fetal Medicine Institute, Department of Obstetrics and Gynaecology, Shenzhen Baoan Women's and Children's Hospital, Jinan University, Shenzhen, China
| | - Yiheng Wang
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; College of Biological Sciences, China Agricultural University, Beijing, China
| | - Xianyang Luo
- The Brain Cognition and Brain Disease Institute, Shenzhen-Hong Kong Institute of Brain Science, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Lingyu Zhao
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; Graduate School of Peking Union Medical College, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Anli Hou
- University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Shuye Tian
- Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen 518055, China
| | - Hongliang Gao
- University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Wenbin Miao
- University of Chinese Academy of Sciences Shenzhen Hospital, Shenzhen, China
| | - Yingyu Liu
- Maternal Fetal Medicine Institute, Department of Obstetrics and Gynaecology, Shenzhen Baoan Women's and Children's Hospital, Jinan University, Shenzhen, China
| | - Huilin Wang
- Maternal Fetal Medicine Institute, Department of Obstetrics and Gynaecology, Shenzhen Baoan Women's and Children's Hospital, Jinan University, Shenzhen, China
| | - Cui Yin
- Department of Gynaecology & Obstetrics, Shenzhen University General Hospital, Shenzhen University, Shenzhen, China
| | - Zhi-Liang Ji
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen, China
| | - Mingqian Feng
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Hongkun Liu
- Jinxin Fertility Group Limited, Chengdu, China
| | - Lianghui Diao
- Shenzhen Key Laboratory for Reproductive Immunology of Peri-Implantation, Shenzhen Zhongshan Institute for Reproduction and Genetics, Shenzhen Zhongshan Urology Hospital, Shenzhen, China
| | - Ido Amit
- Department of Systems Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Yun Chen
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, China; Department of Immunology, Nanjing Medical University, Nanjing, China
| | - Yong Zeng
- Shenzhen Key Laboratory for Reproductive Immunology of Peri-Implantation, Shenzhen Zhongshan Institute for Reproduction and Genetics, Shenzhen Zhongshan Urology Hospital, Shenzhen, China
| | - Florent Ginhoux
- Shanghai Institute of Immunology, Department of Immunology and Microbiology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China; INSERM U1015, Gustave Roussy Cancer Campus, Villejuif 94800, France; Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A(∗)STAR), 8A Biomedical Grove, Immunos, Singapore 138648, Singapore; Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Centre, Singapore 169856, Singapore.
| | - Xueqing Wu
- Department of Gynaecology & Obstetrics, Shenzhen University General Hospital, Shenzhen University, Shenzhen, China.
| | - Yuanfang Zhu
- Maternal Fetal Medicine Institute, Department of Obstetrics and Gynaecology, Shenzhen Baoan Women's and Children's Hospital, Jinan University, Shenzhen, China.
| | - Hanjie Li
- Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
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Cousin I, Misery L, de Vries P, Lebonvallet N. Emergence of New Concepts in Skin Physiopathology through the Use of in vitro Human Skin Explants Models. Dermatology 2023; 239:849-859. [PMID: 37717565 DOI: 10.1159/000533261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 07/20/2023] [Indexed: 09/19/2023] Open
Abstract
BACKGROUND This review summarizes uses and new applications for dermatological research of in vitro culture models of human skin explants (HSEs). In the last decade, many innovations have appeared in the literature and an exponential number of studies have been recorded in various fields of application such as process culture engineering, stem cell extractions methodology, or cell-to-cell interaction studies under physiological and pathological conditions, wound-healing, and inflammation. Most studies also concerned pharmacology, cosmetology, and photobiology. However, these topics will not be considered in our review. SUMMARY A better understanding of the mechanisms driving intercellular relationships, at work in the maintenance of 3D tissue architectures has led to the improvement of cell culture techniques. Many papers have focused on the physiological ways that govern in vitro tissue maintenance of HSEs. The analysis of the necessary mechanical stress, intercellular and cell-matrix interactions, allows the maintenance and prolonged use of HSEs in culture for up to 15 days, regardless of the great variability of study protocols from one laboratory to another and in accordance with the objectives set. Because of their close similarities to fresh skin, HSEs are increasingly used to study skin barrier repair and wound healing physiology. Easy to use in co-culture, this model allows a better understanding of the connections and interactions between the peripheral nervous system, the skin and the immune system. The development of the concept of an integrated neuro-immuno-cutaneous system at work in skin physiology and pathology highlighted by this article represents one of the new technical challenges in the field of in vitro culture of HSE. This review of the literature also reveals the importance of using such models in pathology. As sources of stem cells, HSEs are the basis for the development of new tissue engineering models such as organoids or optical clearing tissues technology. This study identifies the main advances and cross-cutting issues in the use of HSE.
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Affiliation(s)
- Ianis Cousin
- Laboratoire Interactions épithéliums Neurones, Université de Bretagne Occidentale, Brest, France
- Service de chirurgie pédiatrique CHRU de Brest, Brest, France
| | - Laurent Misery
- Laboratoire Interactions épithéliums Neurones, Université de Bretagne Occidentale, Brest, France
- Service de dermatologie CHRU de Brest, Brest, France
| | - Philine de Vries
- Laboratoire Interactions épithéliums Neurones, Université de Bretagne Occidentale, Brest, France
- Service de chirurgie pédiatrique CHRU de Brest, Brest, France
| | - Nicolas Lebonvallet
- Laboratoire Interactions épithéliums Neurones, Université de Bretagne Occidentale, Brest, France
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8
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Itzhakov R, Eretz-Kdosha N, Silberstein E, Alfer T, Gvirtz R, Fallik E, Ogen-Shtern N, Cohen G, Poverenov E. Oligochitosan and oxidized nucleoside-based bioderived hydrogels for wound healing. Carbohydr Polym 2023; 314:120947. [PMID: 37173046 DOI: 10.1016/j.carbpol.2023.120947] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 03/28/2023] [Accepted: 04/20/2023] [Indexed: 05/15/2023]
Abstract
Herein, we report biocompatible hydrogel for wound healing that was prepared using nature-sourced building blocks. For the first time, OCS was employed as a building macromolecule to form bulk hydrogels along with the nature-sourced nucleoside derivative (inosine dialdehyde, IdA) as the cross-linker. A strong correlation was obtained between the mechanical properties and stability of the prepared hydrogels with a cross-linker concentration. The Cryo-SEM images of IdA/OCS hydrogels showed an interconnected spongy-like porous structure. Alexa 555 labeled bovine serum albumin was incorporated into the hydrogels matrix. The release kinetics studies under physiological conditions indicated that cross-linker concentration could also control the release rate. The potential of hydrogels in wound healing applications was tested in vitro and ex vivo on human skin. Topical application of the hydrogel was excellently tolerated by the skin with no impairment of epidermal viability or irritation, determined by MTT and IL-1α assays, respectively. The hydrogels were used to load and deliver epidermal growth factor (EGF), showing an increase in its ameliorating action, effectively enhancing wound closure inflicted by punch biopsy. Furthermore, BrdU incorporation assay performed in both fibroblast and keratinocyte cells revealed an increased proliferation in hydrogel-treated cells and an enhancement of EGF impact in keratinocytes.
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Affiliation(s)
- Rafael Itzhakov
- Agro-Nanotechnology and Advanced Materials Center, Institute of Postharvest and Food Sciences, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel; The Robert H. Smith Faculty of Agriculture, Food and Environment, Biochemistry, and Food Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel.
| | - Noy Eretz-Kdosha
- The Skin Research Institute, Dead Sea & Arava Science Center, Masada 86910, Israel Eilat Campus, Ben-Gurion University of the Negev, Eilat 8855630, Israel.
| | - Eldad Silberstein
- Department of Plastic Surgery, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
| | - Topaz Alfer
- The Skin Research Institute, Dead Sea & Arava Science Center, Masada 86910, Israel Eilat Campus, Ben-Gurion University of the Negev, Eilat 8855630, Israel.
| | - Raanan Gvirtz
- The Skin Research Institute, Dead Sea & Arava Science Center, Masada 86910, Israel Eilat Campus, Ben-Gurion University of the Negev, Eilat 8855630, Israel.
| | - Elazar Fallik
- Agro-Nanotechnology and Advanced Materials Center, Institute of Postharvest and Food Sciences, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel.
| | - Navit Ogen-Shtern
- The Skin Research Institute, Dead Sea & Arava Science Center, Masada 86910, Israel Eilat Campus, Ben-Gurion University of the Negev, Eilat 8855630, Israel; Eilat Campus, Ben-Gurion University of the Negev, Eilat, Israel.
| | - Guy Cohen
- The Skin Research Institute, Dead Sea & Arava Science Center, Masada 86910, Israel Eilat Campus, Ben-Gurion University of the Negev, Eilat 8855630, Israel; Eilat Campus, Ben-Gurion University of the Negev, Eilat, Israel.
| | - Elena Poverenov
- Agro-Nanotechnology and Advanced Materials Center, Institute of Postharvest and Food Sciences, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel.
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9
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Zhou L, Ji W, Dicolandrea T, Finlay D, Supp D, Boyce S, Wei K, Kadekaro AL, Zhang Y. An improved human skin explant culture method for testing and assessing personal care products. J Cosmet Dermatol 2023; 22:1585-1594. [PMID: 36606380 DOI: 10.1111/jocd.15607] [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: 08/30/2022] [Revised: 12/01/2022] [Accepted: 12/15/2022] [Indexed: 01/07/2023]
Abstract
BACKGROUND Cultured human skin models have been widely used in the evaluation of dermato-cosmetic products as alternatives to animal testing and expensive clinical testing. The most common in vitro skin culture approach is to maintain skin biopsies in an airlifted condition at the interface of the supporting culture medium and the air phase. This type of ex vivo skin explant culture is not, however, adequate for the testing of cleansing products, such as shampoos and body washes. One major deficiency is that cleansing products would not remain confined on top of the epidermis and have a high chance of running off toward the dermal side, thus compromising the experimental procedure and data interpretation. MATERIALS AND METHODS Here, we describe an improved ex vivo method for culturing full-thickness human skin for the effective testing and evaluation of skin care products by topical application. RESULTS This newly developed ex vivo human skin culture method has the ability to maintain healthy skin tissues for up to 14 days in culture. Importantly, the model provides a quick and safe way to evaluate skin care products at different time points after single or repetitive topical applications using a combined regimen of leave-on and wash-off. We found that the results obtained using the new skin culture method are reproducible and consistent with the data collected from clinical testing. CONCLUSION Our new ex vivo skin explant method offers a highly efficient and cost-effective system for the evaluation and testing of a variety of personal care products and new formulations.
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Affiliation(s)
- Linli Zhou
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Cincinnati, Cincinnati, Ohio, USA
| | - Wei Ji
- Procter and Gamble Company, Mason Business Center, Mason, Ohio, USA
| | | | - Deborah Finlay
- Procter and Gamble Company, Mason Business Center, Mason, Ohio, USA
| | - Dorothy Supp
- Research Department, Shriners Hospitals for Children-Cincinnati, Cincinnati, Ohio, USA.,Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA.,Center for Stem Cell & Organoid Medicine (CuSTOM), Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Steven Boyce
- Research Department, Shriners Hospitals for Children-Cincinnati, Cincinnati, Ohio, USA.,Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Karl Wei
- Procter and Gamble Company, Mason Business Center, Mason, Ohio, USA
| | - Ana Luisa Kadekaro
- Department of Dermatology, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
| | - Yuhang Zhang
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Cincinnati, Cincinnati, Ohio, USA
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10
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Mirzaei Y, Hagemeister K, Tolba RH, Steitz J. Novel In Vitro Study to Assess Microbial Barrier Properties of Polyurethane-Based Tissue Adhesives in Comparison to the Gold Standard Dermabond®. BIOMED RESEARCH INTERNATIONAL 2022; 2022:5249214. [PMID: 36303586 PMCID: PMC9596255 DOI: 10.1155/2022/5249214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 09/05/2022] [Accepted: 10/07/2022] [Indexed: 11/17/2022]
Abstract
Tissue adhesives as a physical barrier to microorganism penetration provide an alternative method with many advantages for wound closure in surgical settings compared to the clinical standard. This raises the need of developing and conducting in vitro methods that are sensitive and reproducible to assess their microbial barrier properties. In this study, three different polyurethane-based tissue adhesives with different physicochemical properties were evaluated in comparison to Dermabond® as a clinical gold standard for topical wound closure. Here, physicochemical properties varied in lactide concentration, viscosity, processing, and the full polymerization time. To evaluate the microbial barrier function, a 5 μl aliquot of E. coli Lux inoculum containing at least 1 × 109 CFU/ml was applied to the surface of each test adhesive and sterile filter paper as the control that was placed on an agar plate and incubated at 37°C. Plates were observed for bacterial growth (morphology), the adhesion of the adhesive/filter paper, and bioluminescence after 24, 48, and 72 hours. The data presented in this in vitro model indicated that polyurethane-based tissue adhesives with lactide concentration ≥ 5% provided a suitable barrier against microbial penetration with 95% confidence of 99% efficacy for 72 h along with Dermabond®. Interestingly, the here described method was able to discriminate between the different physicochemical properties showing a better microbial barrier function with increasing lactide concentration of the adhesive. Overall, the results of this study showed the noninferiority between Dermabond® and the two abovementioned polyurethane-based tissue adhesives.
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Affiliation(s)
- Yalda Mirzaei
- Institute for Laboratory Animal Science, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
| | | | - René H. Tolba
- Institute for Laboratory Animal Science, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
| | - Julia Steitz
- Institute for Laboratory Animal Science, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
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11
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Lu L, Liu D, Ying J, Yao Z, Hou Q, Wang H, Qi F, Luan W, Jiang H. Denervation Affected Skin Wound Healing in a Modified Rat Model. THE INTERNATIONAL JOURNAL OF LOWER EXTREMITY WOUNDS 2022:15347346221090758. [PMID: 35341341 DOI: 10.1177/15347346221090758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Introduction: Lacking of normal innervation increases the chance of chronic wounds and recurrence of ulceration. Various rodent models are designed to reveal nerve-wound relationship but present many limitations to mimic human wound which heals primarily by re-epithelialization rather than contraction in rodents. This article tested a modified rat model of denervated wound healing to better mimic clinical common denervated wounds. Material and Methods: The wounds formed on right hind paws of 18 SD rats served as the experimental (denervated) group and the left side as contra-lateral control (non-denervated). The denervation was achieved through sciatic and femoral nerve co-transection and the control side underwent sham-surgery 3 days prior to a skin punch wound formation on both sides. Wound closure rate was calculated under digital photographing. Loss of innervation and affected healing process was confirmed by histological analyses. Results: Truncation of the sciatic and femur nerve successfully denervated the skin of the hind paw and resulted in a significantly declined healing rate, prolonged inflammation, weakened dermal contraction, hindered macrophage recruitment, retarded re-epithelialization and collagen deposition, decreased angiogenesis and epidermal proliferation, and persisted epidermal apoptosis compared to the innervated contra-lateral control. Conclusion: Wound on denervated dorsal pedis in rats can be used to study denervated skin healing in multiple histological process. We believe that this model will assist in understanding the underlying mechanism of nerve-wound relationship and identifying new treatment strategies that can be more rapidly translated into clinical practice.
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Affiliation(s)
- Lu Lu
- Department of Plastic and Reconstructive Surgery, 66324Shanghai Dongfang Hospital, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200120, China
| | - Dandan Liu
- Department of Plastic Surgery, 74573Shenzhen Hospital, Peking University, Shenzhen, 510836, China
| | - Jianghui Ying
- Department of Plastic and Reconstructive Surgery, 66324Shanghai Dongfang Hospital, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200120, China
| | - Zuochao Yao
- Department of Plastic and Reconstructive Surgery, 66324Shanghai Dongfang Hospital, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200120, China
| | - Qiang Hou
- Department of Plastic and Reconstructive Surgery, 66324Shanghai Dongfang Hospital, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200120, China
| | - Hui Wang
- Department of Plastic and Reconstructive Surgery, 66324Shanghai Dongfang Hospital, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200120, China
| | - Fazhi Qi
- Department of Plastic and Reconstructive Surgery, 92323Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Wenjie Luan
- Department of Plastic and Reconstructive Surgery, 92323Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Hua Jiang
- Department of Plastic and Reconstructive Surgery, 66324Shanghai Dongfang Hospital, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200120, China
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12
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Huang M, Smith A, Watson M, Bhandari R, Baugh LM, Ivanovska I, Watkins T, Lang I, Trojanowska M, Black LD, Pioli PA, Garlick J, Whitfield ML. Self-Assembled Human Skin Equivalents Model Macrophage Activation of Cutaneous Fibrogenesis in Systemic Sclerosis. Arthritis Rheumatol 2022; 74:1245-1256. [PMID: 35212485 DOI: 10.1002/art.42097] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/28/2021] [Accepted: 02/15/2022] [Indexed: 12/12/2022]
Abstract
OBJECTIVE The development of precision therapeutics for systemic sclerosis (SSc) has been hindered by the lack of models that accurately mimic the disease in vitro. This study was undertaken to design and test a self-assembled skin equivalent (saSE) system that recapitulates the cross-talk between macrophages and fibroblasts in cutaneous fibrosis. METHODS SSc-derived dermal fibroblasts (SScDFs) and normal dermal fibroblasts (NDFs) were cultured with CD14+ monocytes from SSc patients or healthy controls to allow de novo stroma formation. Monocyte donor-matched plasma was introduced at week 3 prior to seeding keratinocytes to produce saSE with a stratified epithelium. Tissue was characterized by immunohistochemical staining, atomic force microscopy, enzyme-linked immunosorbent assay, and quantitative reverse transcriptase-polymerase chain reaction. RESULTS Stroma synthesized de novo from NDFs and SScDFs supported a fully stratified epithelium to form saSE. A thicker and stiffer dermis was generated by saSE with SScDFs, and more interleukin-6 and transforming growth factor β (TGFβ) was secreted by saSE with SScDFs compared to saSE with NDFs, regardless of the inclusion of monocytes. Tissue with SSc monocytes and plasma had amplified dermal thickness and stiffness relative to control tissue. Viable CD163+ macrophages were found within the stroma of saSE 5 weeks after seeding. Additionally, SSc saSE contained greater numbers of CD163+ and CD206+ macrophages compared to control saSE. TGFβ blockade inhibited stromal stiffness to a greater extent in SSc saSE compared to control saSE. CONCLUSION These data suggest reciprocal activation between macrophages and fibroblasts that increases tissue thickness and stiffness, which is dependent in part on TGFβ activation. The saSE system may serve as a platform for preclinical therapeutic testing and for molecular characterization of SSc skin pathology through recapitulation of the interactions between macrophages and fibroblasts.
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Affiliation(s)
- Mengqi Huang
- Dartmouth Geisel School of Medicine, Hanover, New Hampshire, and University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Avi Smith
- Tufts University, Boston, Massachusetts
| | | | - Rajan Bhandari
- Dartmouth Geisel School of Medicine, Hanover, New Hampshire
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13
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A new ex vivo skin model for mechanistic understanding of putative anti-inflammatory topical therapeutics. Int J Pharm 2022; 617:121610. [PMID: 35202723 DOI: 10.1016/j.ijpharm.2022.121610] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 02/17/2022] [Accepted: 02/19/2022] [Indexed: 12/24/2022]
Abstract
Several in vitro models have been designed as test systems for inflammatory skin conditions, commonly using cell-culture or reconstructed human epidermis approaches. However, these systems poorly recapitulate the physiology and, importantly, the metabolism and biochemical activity of skin in vivo, whereas ex vivo skin culture models can retain these features of the tissue. Our objective was to develop a human ex vivo skin culture model to explore the pathophysiology of inflammatory dermatoses and for preclinical testing of potential therapeutic treatments. Following exogenous stimulation, tissue integrity and ability to induce inflammatory gene expression was retained, and stimulant concentrations and duration was optimised to mimic published data from inflammatory clinical biopsies of dermatitis and psoriasis patients. The validity and utility of the model was demonstrated when challenged with 5 drugs including a corticosteroid and vitamin D3 analogue, where inflammatory biomarkers were regulated in a manner consistent with the drugs' reported in vivo mechanisms of action. This model retains important inflammatory gene signals observed in human inflammatory dermatoses for preclinical evaluation of novel therapeutics.
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14
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15
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van de Vyver M, Idensohn PJ, Niesler CU. A regenerative approach to the pharmacological management of hard-to-heal wounds. Biochimie 2022; 194:67-78. [PMID: 34982983 DOI: 10.1016/j.biochi.2021.12.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 11/27/2021] [Accepted: 12/29/2021] [Indexed: 12/12/2022]
Abstract
A wound is considered hard-to-heal when, despite the appropriate clinical analysis and intervention, the wound area reduces by less than a third at four weeks and complete healing fails to occur within 12 weeks. The most prevalent hard-to-heal wounds are associated with underlying metabolic diseases or vascular insufficiency and include arterial, venous, pressure and diabetic foot ulcers. Their common features include an abnormal immune response and extended inflammatory phase, a subdued proliferation phase due to cellular insufficiencies and finally an almost non-existent remodeling phase. Advances in wound care technology, tested in both pre-clinical models and clinical trials, have paved the way for improved treatment options, focused on regeneration. These interventions have been shown to limit the extent of ongoing inflammatory damage, decrease bacterial load, promote angiogenesis and deposition of granulation tissue, and stimulate keratinocyte migration thereby promoting re-epithelialization in these wounds. The current review discusses these hard-to-heal wounds in the context of their underlying pathology and potential of advanced treatment options, which if applied promptly as a standard of care, could reduce morbidity, promote quality of life, and alleviate the burden on a strained health system.
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Affiliation(s)
- M van de Vyver
- Division of Clinical Pharmacology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, South Africa.
| | - P J Idensohn
- CliniCare Medical Centre, Ballito, KwaZulu-Natal, South Africa; School of Nursing, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - C U Niesler
- Discipline of Biochemistry, School of Life Sciences, University of KwaZulu Natal, Scottsville, South Africa
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16
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Gorzalczany SB, Rodriguez Basso AG. Strategies to apply 3Rs in preclinical testing. Pharmacol Res Perspect 2021; 9:e00863. [PMID: 34609088 PMCID: PMC8491455 DOI: 10.1002/prp2.863] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 08/13/2021] [Indexed: 12/12/2022] Open
Abstract
Animal experimentation has been fundamental in biological and biomedical research. To guarantee the maximum quality, efficacy and/or safety of products intended for the use in humans in vivo testing is necessary; however, for over 60 years, alternative methods have been developed in response to the necessity to reduce the number of animals used in experimentation, to guarantee their welfare; resorting to animal models only when strictly necessary. The three Rs (Replacement, Reduction, and Refinement), seek to ensure the rational and respectful use of laboratory animals and maintain an adequate projection in terms of bioethical considerations. This article describes different approaches to apply 3Rs in preclinical experimentation for either research or regulatory purposes.
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Affiliation(s)
- Susana B. Gorzalczany
- Universidad de Buenos AiresFacultad de Farmacia y Bioquímica, Pharmacology DepartmentBuenos AiresArgentina
| | - Angeles G. Rodriguez Basso
- Universidad de Buenos AiresFacultad de Farmacia y Bioquímica, Pharmacology DepartmentBuenos AiresArgentina
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17
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Letsiou S. Tracing skin aging process: a mini- review of in vitro approaches. Biogerontology 2021; 22:261-272. [PMID: 33721158 DOI: 10.1007/s10522-021-09916-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 03/04/2021] [Indexed: 12/25/2022]
Abstract
Skin is a rather complex, yet useful organ of our body. Besides, skin aging is a complicated process that gains a growing interest as mediates many molecular processes in our body. Thus, an efficient skin model is important to understand skin aging function as well as to develop an effective innovative product for skin aging treatment. In this mini review, we present in vitro methods for assessments of skin aging in an attempt to pinpoint basic molecular mechanisms behind this process achieving both a better understanding of aging function and an effective evaluation of potential products or ingredients that counteract aging. Specifically, this study presents in vitro assays such as 2D or 3D skin models, to evaluate skin aging-related processes such as skin moisturization, photoaging, wound healing, menopause, and skin microbiome as novel efforts in the designing of efficacy assessments in the development of skincare products.
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Affiliation(s)
- Sophia Letsiou
- Laboratory of Biochemistry, Research and Development Department, APIVITA S.A., Industrial Park of Markopoulo Mesogaias, Markopoulo Attiki, 19003, Athens, Greece.
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18
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De Clercq E, Den Hondt S, De Baere C, Martens AM. Effects of various wound dressings on microbial growth in perfused equine musculocutaneous flaps. Am J Vet Res 2021; 82:189-197. [PMID: 33629894 DOI: 10.2460/ajvr.82.3.189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To compare the effect of multiple wound dressings on microbial growth in a perfused equine wound model. SAMPLE Abdominal musculocutaneous flaps from 16 equine cadavers. PROCEDURES 8 full-thickness skin wound covered were created in each flap. Tissues were perfused with saline (0.9% NaCl) solution. Wounds were inoculated with methicillin-resistant Staphylococcus aureus (MRSA) or Pseudomonas aeruginosa (106 CFUs), incubated, and covered with a dressing containing activated charcoal, boric acid, cadexomer iodine, calcium alginate, manuka honey, nanoparticle silver, or polyhexamethylene biguanide or with a control (nonadherent gauze) dressing. Muscle biopsy specimens were obtained at baseline (immediately prior to dressing application) and 6, 12, 18, and 24 hours later for mean bacterial load (MBL) determination. The MBLs at each subsequent time point were compared with that at baseline within dressing types, and MBLs at each time point were compared among dressing types. RESULTS MBLs in MRSA-inoculated wounds covered with cadexomer iodine dressings were significantly decreased from baseline at the 6- and 12-hour time points. For P aeruginosa-inoculated wounds, MBLs were significantly increased from baseline in all wounds at various times except for wounds with cadexomer iodine dressings. The MBLs of wounds with cadexomer iodine dressings were lower than all others, although not always significantly different from those for wounds with boric acid, manuka honey, nanoparticle silver, and polyhexamethylene biguanide dressings. CONCLUSIONS AND CLINICAL RELEVANCE In this nonviable perfused wound model, growth of MRSA and P aeruginosa was most effectively reduced or inhibited by cadexomer iodine dressings. These results and the effect of the dressings on wound healing should be confirmed with in vivo studies.
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19
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Active neutrophil responses counteract Candida albicans burn wound infection of ex vivo human skin explants. Sci Rep 2020; 10:21818. [PMID: 33311597 PMCID: PMC7732850 DOI: 10.1038/s41598-020-78387-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 11/13/2020] [Indexed: 12/14/2022] Open
Abstract
Burn wounds are highly susceptible sites for colonization and infection by bacteria and fungi. Large wound surface, impaired local immunity, and broad-spectrum antibiotic therapy support growth of opportunistic fungi such as Candida albicans, which may lead to invasive candidiasis. Currently, it remains unknown whether depressed host defenses or fungal virulence drive the progression of burn wound candidiasis. Here we established an ex vivo burn wound model, where wounds were inflicted by applying preheated soldering iron to human skin explants, resulting in highly reproducible deep second-degree burn wounds. Eschar removal by debridement allowed for deeper C. albicans penetration into the burned tissue associated with prominent filamentation. Active migration of resident tissue neutrophils towards the damaged tissue and release of pro-inflammatory cytokine IL-1β accompanied the burn. The neutrophil recruitment was further increased upon supplementation of the model with fresh immune cells. Wound area and depth decreased over time, indicating healing of the damaged tissue. Importantly, prominent neutrophil presence at the infected site correlated to the limited penetration of C. albicans into the burned tissue. Altogether, we established a reproducible burn wound model of candidiasis using ex vivo human skin explants, where immune responses actively control the progression of infection and promote tissue healing.
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20
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Neil JE, Brown MB, Williams AC. Human skin explant model for the investigation of topical therapeutics. Sci Rep 2020; 10:21192. [PMID: 33273665 PMCID: PMC7712775 DOI: 10.1038/s41598-020-78292-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 11/23/2020] [Indexed: 12/16/2022] Open
Abstract
The development of in vitro and ex vivo models to mimic human illness is important not only for scientific understanding and investigating therapeutic approaches but also to mitigate animal testing and bridge the inter-species translational gap. While in vitro models can facilitate high-throughput and cost-efficient evaluation of novel therapeutics, more complex ex vivo systems can better predict both desirable and adverse in vivo effects. Here we describe an ex vivo cultured human skin explant model in which we have characterized pathological tissue integrity, barrier function and metabolic stability over time. Our findings suggest that human skin can be successfully cultured for pharmacodynamic use up to and beyond 9 days without any adverse physiological consequence.
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21
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Correia-Sá IB, Carvalho CM, Serrão PV, Machado VA, Carvalho SO, Marques M, Vieira-Coelho MA. AM251, a cannabinoid receptor 1 antagonist, prevents human fibroblasts differentiation and collagen deposition induced by TGF-β - An in vitro study. Eur J Pharmacol 2020; 892:173738. [PMID: 33220269 DOI: 10.1016/j.ejphar.2020.173738] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 11/01/2020] [Accepted: 11/04/2020] [Indexed: 10/22/2022]
Abstract
Previous studies showed that cannabinoid 1 receptor (CB1) is linked with skin fibrosis and scar tissue formation in mice. Therefore, the topical use of cannabinoids may have a role in the prevention or treatment of local fibrotic and wound healing diseases as hypertrophic scars or keloids. In this study, we asked whether CB1 activation or inactivation would change fibroblast differentiation into myofibroblast and collagen deposition in skin human fibroblast. Primary cultures of adult human fibroblasts were obtained from abdominal human skin. Cells were stimulated with transforming growth factor-beta (TGF-β, 10ng/ml) and treated with a CB1 selective agonist (arachidonyl-2-chloroethylamide, ACEA 1 μM) and an antagonist (AM251 1, 5 and 10 μM). Alpha-smooth muscle actin (α-SMA) was quantified using Immunocytochemistry and Western Blot. Collagen was quantified with Sirius Red staining assay. Significance was assessed by One-way ANOVA. P < 0.05 was considered significant. TGF-β significantly increases α-SMA expression. ACEA 1 μM significantly increases collagen deposition but does not change α-SMA expression. AM251 10 μM added in the absence and the presence of ACEA reduces α-SMA expression and collagen content in TGF-β treated cells. AM251 shows a concentration-dependent effect over collagen deposition with a pIC50 of 5.5 (4.6-6.4). TGF-β significantly increases CB1 receptor expression. CB1 inactivation with AM251 prevents fibroblasts differentiation and collagen deposition, induced by TGF-β in human fibroblasts. The outcome supports that CB1 is a molecular target for wound healing disorders and in vivo and pre-clinical studies should be implemented to clarify this premise.
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Affiliation(s)
- Inês B Correia-Sá
- Department of Plastic, Reconstructive and Aesthetic Surgery and Burn Unit, Faculty of Medicine, University of Porto and Centro Hospitalar São João, EPE, Porto, Portugal; Department of Biomedicine - Pharmacology and Therapeutics Unit, Faculty of Medicine, University of Oporto, Porto, Portugal.
| | - Cláudia M Carvalho
- Department of Biomedicine - Pharmacology and Therapeutics Unit, Faculty of Medicine, University of Oporto, Porto, Portugal
| | - Paula V Serrão
- Department of Biomedicine - Pharmacology and Therapeutics Unit, Faculty of Medicine, University of Oporto, Porto, Portugal
| | - Vera A Machado
- Department of Biomedicine - Pharmacology and Therapeutics Unit, Faculty of Medicine, University of Oporto, Porto, Portugal
| | - Sofia O Carvalho
- Department of Biomedicine - Pharmacology and Therapeutics Unit, Faculty of Medicine, University of Oporto, Porto, Portugal
| | - Marisa Marques
- Department of Plastic, Reconstructive and Aesthetic Surgery and Burn Unit, Faculty of Medicine, University of Porto and Centro Hospitalar São João, EPE, Porto, Portugal
| | - Maria A Vieira-Coelho
- Department of Biomedicine - Pharmacology and Therapeutics Unit, Faculty of Medicine, University of Oporto, Porto, Portugal
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22
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Przekora A, Kazimierczak P, Wojcik M. Ex vivo determination of chitosan/curdlan/hydroxyapatite biomaterial osseointegration with the use of human trabecular bone explant: New method for biocompatibility testing of bone implants reducing animal tests. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 119:111612. [PMID: 33321655 DOI: 10.1016/j.msec.2020.111612] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/05/2020] [Accepted: 10/07/2020] [Indexed: 12/12/2022]
Abstract
Permanent orthopedic/dental implants should reveal good osseointegration, which is defined as an ability of the biomaterial to form a direct connection with the surrounding host bone tissue after its implantation into the living organism. Currently, biomaterial osseointegration is confirmed exclusively with the use of in vivo animal tests. This study presents for the first time ex vivo determination of osseointegration process using human trabecular bone explant that was drilled and filled with the chitosan/curdlan/hydroxyapatite biomaterial, followed by its long-term culture under in vitro conditions. Within this study, it was clearly proved that tested biomaterial allows for the formation of the connection with bone explant since osteoblasts, having ability to produce bone extracellular matrix (type I collagen, fibronectin), were detected at a bone-implant interface by confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Importantly, in this research it was demonstrated by Live/Dead staining and CLSM imaging that human bone explants may stay alive for a long period of time (at least approx. 50 days) during their culture under in vitro conditions. Therefore, ex vivo bone explant, which is a heterogeneous tissue containing many different cell types, may serve as an excellent model to test biomaterial osseointegration during comparative and preliminary studies, reducing animal tests which is compatible with the principles of '3Rs', aiming to Replace, Reduce and Refine the use of animals wherever possible.
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Affiliation(s)
- Agata Przekora
- Chair and Department of Biochemistry and Biotechnology, Medical University of Lublin, Chodzki 1 Street, 20-093 Lublin, Poland.
| | - Paulina Kazimierczak
- Chair and Department of Biochemistry and Biotechnology, Medical University of Lublin, Chodzki 1 Street, 20-093 Lublin, Poland
| | - Michal Wojcik
- Chair and Department of Biochemistry and Biotechnology, Medical University of Lublin, Chodzki 1 Street, 20-093 Lublin, Poland
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23
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Rosselle L, Cantelmo AR, Barras A, Skandrani N, Pastore M, Aydin D, Chambre L, Sanyal R, Sanyal A, Boukherroub R, Szunerits S. An 'on-demand' photothermal antibiotic release cryogel patch: evaluation of efficacy on an ex vivo model for skin wound infection. Biomater Sci 2020; 8:5911-5919. [PMID: 32996926 DOI: 10.1039/d0bm01535k] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A myriad of topical therapies and dressings are available to the clinicians for wound healing skin, but only a very few have shown their effectiveness in promoting wound repair due to challenges in controlling drug release. To address this issue, in this work, a near infrared (NIR)-light activable cryogel based on butyl methacrylate (BuMA) and poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) incorporated with reduced graphene oxide (rGO) was fabricated. The obtained cryogel provides the required hydrophilicity beneficial for wound treatment. The excellent photo-thermal properties of rGO allow for heating the cryogel, which results in subsequent swelling of the cryogel (CG) followed by release of the encapsulated drug load, cefepime in our case. Without photothermal activation, no release of payload was observed. The potential of this bandage for wound healing was examined using an ex vivo human skin model infected with Staphylococcus aureus (S. aureus). Apart from the efficacy of the cryogel based wound healing system, our results also suggest that the ex vivo wound model evaluated here provides a rapid and valuable tool to study superficial skin infections in humans and test the efficacy of antimicrobial agents.
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Affiliation(s)
- Léa Rosselle
- Univ. Lille, CNRS, Centrale Lille, Yncréa ISEN, Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, F-59000 Lille, France.
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24
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Gross-Amat O, Guillen M, Salmon D, Nataf S, Auxenfans C. Characterization of a Topically Testable Model of Burn Injury on Human Skin Explants. Int J Mol Sci 2020; 21:ijms21186956. [PMID: 32971882 PMCID: PMC7554828 DOI: 10.3390/ijms21186956] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 09/11/2020] [Accepted: 09/16/2020] [Indexed: 01/25/2023] Open
Abstract
Severe burn injuries remain a major health problem due to high rates of mortality, residual morbidity, and/or aesthetic damages. To find new therapies aimed at promoting a harmonious healing of skin burns, it is important to develop models which take into account the unique properties of the human skin. Based on previously described models of burn injury performed on human skin explants, we hypothesized that maintaining explants under constant tension forces would allow to more closely reproduce the pathophysiological processes of skin remodeling. We thus. Here, we set up and characterized an improved model of deep second-degree burn injury on ex vivo cultured human skin explants at air-liquid interface and maintained under conditions of constant tension forces. A spontaneous re-epithelialization of the lesion was observed 8 to 9 days post burn and was found to rely on the proliferation of basal keratinocytes at the wound edges. Collagen VII at the dermo-epidermal junction reformed along with the progression of re-epithelializatio and a synthesis of procollagen III was observed in the dermis at the wound site. These findings indicate that our model is suitable for the assessment of clinically-relevant therapies aimed at modulating the kinetics of re-epithelialization and/or the activation of fibroblasts following skin burn injuries. In this regard, we evaluated the use of a thermoreversible poloxamer hydrogel as a vehicle for topically-testable therapeutic molecules. Our data showed that, although useful for drug formulation, the p407/p188 poloxamer hydrogel induces a delay of skin re-epithelialization in humans skin explants submitted to experimental burn injury.
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Affiliation(s)
- Olivia Gross-Amat
- Lyon-Est School of Medicine, University Claude Bernard Lyon-1, 69100 Villeurbanne, France; (M.G.); (S.N.)
- Bank of Tissues and Cells, Lyon University Hospital (Hospices Civils de Lyon), 69003 Lyon, France;
- CarMeN Laboratory, INSERM U1060, INRA U1397, INSA de Lyon, 69600 Oullins, France
- Correspondence:
| | - Marine Guillen
- Lyon-Est School of Medicine, University Claude Bernard Lyon-1, 69100 Villeurbanne, France; (M.G.); (S.N.)
- Bank of Tissues and Cells, Lyon University Hospital (Hospices Civils de Lyon), 69003 Lyon, France;
| | - Damien Salmon
- Fundamental, Clinical and Therapeutic Aspects of Skin Barrier Function, EA4169, University of Lyon 1, 69008 Lyon, France;
| | - Serge Nataf
- Lyon-Est School of Medicine, University Claude Bernard Lyon-1, 69100 Villeurbanne, France; (M.G.); (S.N.)
- Bank of Tissues and Cells, Lyon University Hospital (Hospices Civils de Lyon), 69003 Lyon, France;
- CarMeN Laboratory, INSERM U1060, INRA U1397, INSA de Lyon, 69600 Oullins, France
| | - Céline Auxenfans
- Bank of Tissues and Cells, Lyon University Hospital (Hospices Civils de Lyon), 69003 Lyon, France;
- Tissue Biology and Therapeutic Engineering Laboratory, UMR 5305, 69007 Lyon, France
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25
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A human skin equivalent burn model to study the effect of a nanocrystalline silver dressing on wound healing. Burns 2020; 47:417-429. [PMID: 32830005 DOI: 10.1016/j.burns.2020.07.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 07/02/2020] [Accepted: 07/06/2020] [Indexed: 01/17/2023]
Abstract
In this study, a deep burn wound model was established using a 3D human skin equivalent (HSE) model and this was compared to native skin. HSEs were constructed from dermis derived from abdominoplasty/breast surgery and this dermal template was seeded with primary keratinocytes and fibroblasts. The HSE model was structurally similar to native skin with a stratified and differentiated epidermis. A contact burn (60 °C, 80 °C, 90 °C) was applied with a modified soldering iron and wounds were observed at day 1 and 7 after burn. The HSEs demonstrated re-growth with keratinocyte proliferation and formation of a neo-epidermis after burn injury, whereas the ex vivo native skin did not. To assess the suitability of the 3D HSE model for penetration and toxicity studies, a nanocrystalline silver dressing was applied to the model for 7 days, with and without burn injury. The effect of silver on skin re-growth and its penetration and subcellular localization was assessed in HSEs histologically and with laser ablation-inductively coupled plasma mass spectrometry (LA-ICPMS). The silver treatment delayed or reduced skin re-growth, and silver particles were detected on the top of the epidermis, and within the papillary dermis. This novel in vitro 3D multicellular deep burn wound model is effective for studying the pathology and treatment of burn wound injury and is suitable for penetration and toxicity studies of wound healing treatments.
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26
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Kalantari K, Mostafavi E, Afifi AM, Izadiyan Z, Jahangirian H, Rafiee-Moghaddam R, Webster TJ. Wound dressings functionalized with silver nanoparticles: promises and pitfalls. NANOSCALE 2020; 12:2268-2291. [PMID: 31942896 DOI: 10.1039/c9nr08234d] [Citation(s) in RCA: 167] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Infections are the main reason why most people die from burns and diabetic wounds. The clinical challenge for treating wound infections through traditional antibiotics has been growing steadily and has now reached a critical status requiring a paradigm shift for improved chronic wound care. The US Centers for Disease Control have predicted more deaths from antimicrobial-resistant bacteria than from all types of cancers combined by 2050. Thus, the development of new wound dressing materials that do not rely on antibiotics is of paramount importance. Currently, incorporating nanoparticles into scaffolds represents a new concept of 'nanoparticle dressing' which has gained considerable attention for wound healing. Silver nanoparticles (Ag-NPs) have been categorized as metal-based nanoparticles and are intriguing materials for wound healing because of their excellent antimicrobial properties. Ag-NPs embedded in wound dressing polymers promote wound healing and control microorganism growth. However, there have been several recent disadvantages of using Ag-NPs to fight infections, such as bacterial resistance. This review highlights the therapeutic approaches of using wound dressings functionalized with Ag-NPs and their potential role in revolutionizing wound healing. Moreover, the physiology of the skin and wounds is discussed to place the use of Ag-NPs in wound care into perspective.
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Affiliation(s)
- Katayoon Kalantari
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA. and Centre of Advanced Materials (CAM), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Ebrahim Mostafavi
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
| | - Amalina M Afifi
- Centre of Advanced Materials (CAM), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Zahra Izadiyan
- Department of Environment and Green Technology, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia
| | - Hossein Jahangirian
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
| | | | - Thomas J Webster
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
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27
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Rakita A, Nikolić N, Mildner M, Matiasek J, Elbe-Bürger A. Re-epithelialization and immune cell behaviour in an ex vivo human skin model. Sci Rep 2020; 10:1. [PMID: 31913322 PMCID: PMC6959339 DOI: 10.1038/s41598-019-56847-4] [Citation(s) in RCA: 5215] [Impact Index Per Article: 1303.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/10/2019] [Indexed: 02/06/2023] Open
Abstract
A large body of literature is available on wound healing in humans. Nonetheless, a standardized ex vivo wound model without disruption of the dermal compartment has not been put forward with compelling justification. Here, we present a novel wound model based on application of negative pressure and its effects for epidermal regeneration and immune cell behaviour. Importantly, the basement membrane remained intact after blister roof removal and keratinocytes were absent in the wounded area. Upon six days of culture, the wound was covered with one to three-cell thick K14+Ki67+ keratinocyte layers, indicating that proliferation and migration were involved in wound closure. After eight to twelve days, a multi-layered epidermis was formed expressing epidermal differentiation markers (K10, filaggrin, DSG-1, CDSN). Investigations about immune cell-specific manners revealed more T cells in the blister roof epidermis compared to normal epidermis. We identified several cell populations in blister roof epidermis and suction blister fluid that are absent in normal epidermis which correlated with their decrease in the dermis, indicating a dermal efflux upon negative pressure. Together, our model recapitulates the main features of epithelial wound regeneration, and can be applied for testing wound healing therapies and investigating underlying mechanisms.
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Affiliation(s)
- Ana Rakita
- Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Nenad Nikolić
- Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Michael Mildner
- Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Johannes Matiasek
- Department of Plastic, Aesthetic and Reconstructive Surgery, St. Josef Hospital, Vienna, Austria
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28
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Abazari M, Ghaffari A, Rashidzadeh H, Momeni Badeleh S, Maleki Y. Current status and future outlook of nano-based systems for burn wound management. J Biomed Mater Res B Appl Biomater 2019; 108:1934-1952. [PMID: 31886606 DOI: 10.1002/jbm.b.34535] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 11/03/2019] [Accepted: 11/16/2019] [Indexed: 01/07/2023]
Abstract
Wound healing process is a natural and intricate response of the body to its injuries and includes a well-orchestrated sequence of biochemical and cellular phenomena to restore the integrity of skin and injured tissues. Complex nature and associated complications of burn wounds lead to an incomplete and prolonged recovery of these types of wounds. Among different materials and systems which have been used in treating the wounds, nanotechnology driven therapeutic systems showed a great opportunity to improvement and enhancement of the healing process of different type of wounds. The aim of this study is to provide an overview of the recent studies about the various nanotechnology-based management of burn wounds and the future outlook of these systems in this area. Laboratory and animal models for assessing the efficacy of these systems in burn wound management also discussed.
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Affiliation(s)
- Morteza Abazari
- Department of Pharmaceutical Nanotechnology, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Azadeh Ghaffari
- Department of Food and Drug Control, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran.,Pharmaceutical Nanotechnology Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Hamid Rashidzadeh
- Department of pharmaceutical biomaterial, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Safa Momeni Badeleh
- Department of Food and Drug Control, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Yaser Maleki
- Department of Nanochemistry, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran
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29
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Ex vivo culture of lesional psoriasis skin for pharmacological testing. J Dermatol Sci 2019; 97:109-116. [PMID: 31948839 DOI: 10.1016/j.jdermsci.2019.12.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 11/18/2019] [Accepted: 12/24/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Psoriasis is a chronic, inflammatory skin disorder resulting from a complex interplay between immune and skin cells via release of soluble mediators. While a lot is known about the molecular mechanisms behind psoriasis pathogenesis, there is still a need for preclinical research models that accuratelyreplicate the disease. OBJECTIVE This study aimed to develop and characterize ex vivo culture of psoriasis skin as a model for pharmacological testing, where the immunological events of psoriasis can be followed. METHODS Full thickness punch biopsies of lesional psoriasis skin were cultured in submerged conditions up to 144 h followingin situ T cell stimulation with rhIL-23 and anti-CD3 and anti-CD28 antibodies. The T cell mediated skin inflammation was assessed by gene and protein l analysis for a panel of inflammatory mediators. Tissue integrity and morphology were evaluated by histological analysis. RESULTS T cell stimulation resulted in functional and psoriasis specificin situ activation of T cells. The expression levels of most of the proinflammatory mediators related to both immune and skin cells were comparable to these in freshly isolated tissue at 48 and 96 h of culture. Tissue integrity and morphology were sustained up to 96 h. Treatment with a corticosteroid reduced the expression of several pro-inflammatory cytokines and chemokines, whereas anti-IL-17A antibody treatment reduced the expression of the IL-17A downstream markers IL-8 and DEFB4. CONCLUSION By preserving keyimmunopathological mechanisms of psoriasis, ex vivo culture of psoriasis skin can be used for the investigation of inflammatory processes of psoriasis and for preclinical drug discovery research.
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30
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Baumbach CM, Schrödl W, Nenoff P, Uhrlaß S, Mülling CKW, Michler JK. Modeling dermatophytosis: Guinea pig skin explants represent a highly suitable model to study Trichophyton benhamiae infections. J Dermatol 2019; 47:8-16. [PMID: 31782188 DOI: 10.1111/1346-8138.15150] [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: 05/31/2019] [Accepted: 10/18/2019] [Indexed: 12/11/2022]
Abstract
Dermatophyte infections are a growing health concern worldwide with increasing patient numbers, especially in children. However, detailed knowledge about infection mechanisms and virulence factors are scarce. This study aimed to establish an infection model based on guinea pig skin explants mimicking the in vivo situation as closely as possible to survey the pathogenesis of dermatophytoses. A fundamental prerequisite was the detailed description of native guinea pig skin and its morphological changes during tissue culture because comprehensive data on guinea pig skin characteristics were not available. Skin explants were harvested from healthy, adult guinea pigs and transferred to cell culture inserts. One group was inoculated with defined suspensions of colony-forming units of zoonotic Trichophyton benhamiae isolates; others served as controls to assess the tissue viability during the 10-day culture. Samples were taken on days 3, 5, 7 and 10 and processed for histological and immunohistochemical analysis. Standard tissue culture conditions provoked acantholysis and regional orthokeratotic alterations. The reduced desquamation caused hyperkeratosis paralleled by hypogranulosis or regional hyperplasia. During T. benhamiae infection, keratinocyte proliferation came to a complete halt on day 5 whereas the number of terminal deoxynucleotidyl transferase dUTP nick end labeling assay-positive cells increased moderately up to day 7. Hyphae grew massively into the skin explants causing strong keratinolysis and tricholysis. By the end of the culture, complete disintegration of the basement membrane and dermal tissue was observed. A realistic and reliable skin infection model was established to study dermatophytoses in general and cutaneous T. benhamiae infections in particular.
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Affiliation(s)
- Christina-Marie Baumbach
- Institute of Bacteriology and Mycology, Center for Infectious Diseases, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Wieland Schrödl
- Institute of Bacteriology and Mycology, Center for Infectious Diseases, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Pietro Nenoff
- Laboratory for Medical Microbiology, Mölbis, Germany
| | - Silke Uhrlaß
- Laboratory for Medical Microbiology, Mölbis, Germany
| | - Christoph K W Mülling
- Institute of Veterinary Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Jule Kristin Michler
- Institute of Veterinary Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
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31
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Li J, Wang J, Wang Z, Xia Y, Zhou M, Zhong A, Sun J. Experimental models for cutaneous hypertrophic scar research. Wound Repair Regen 2019; 28:126-144. [PMID: 31509318 DOI: 10.1111/wrr.12760] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 08/29/2019] [Accepted: 09/06/2019] [Indexed: 01/07/2023]
Abstract
Human skin wound repair may result in various outcomes with most of them leading to scar formation. Commonly seen in many cutaneous wound healing cases, hypertrophic scars are considered as phenotypes of abnormal wound repair. To prevent the formation of hypertrophic scars, efforts have been made to understand the mechanism of scarring following wound closure. Numerous in vivo and in vitro models have been created to facilitate investigations into cutaneous scarring and the development of antiscarring treatments. To select the best model for a specific study, background knowledge of the current models of hypertrophic scars is necessary. In this review, we describe in vivo and in vitro models for studying hypertrophic scars, as well as the distinct characteristics of these models. The choice of models for a specific study should be based on the characteristics of the model and the goal of the study. In general, in vivo animal models are often used in phenotypical scar formation analysis, development of antiscarring treatment, and functional analyses of individual genes. In contrast, in vitro models are chosen to pathway identification during scar formation as well as in high-throughput analysis in drug development. Besides helping investigators choose the best scarring model for their research, the goal of this review is to provide knowledge for improving the existing models and development of new models. These will contribute to the progress of scarring studies.
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Affiliation(s)
- Jialun Li
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Jiecong Wang
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Zhenxing Wang
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Yun Xia
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Muran Zhou
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Aimei Zhong
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Jiaming Sun
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
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Garcia-Orue I, Santos-Vizcaino E, Etxabide A, Uranga J, Bayat A, Guerrero P, Igartua M, de la Caba K, Hernandez RM. Development of Bioinspired Gelatin and Gelatin/Chitosan Bilayer Hydrofilms for Wound Healing. Pharmaceutics 2019; 11:E314. [PMID: 31277455 PMCID: PMC6680716 DOI: 10.3390/pharmaceutics11070314] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/17/2019] [Accepted: 07/01/2019] [Indexed: 12/22/2022] Open
Abstract
In the current study, we developed a novel gelatin-based bilayer wound dressing. We used different crosslinking agents to confer unique properties to each layer, obtaining a bioinspired multifunctional hydrofilm suitable for wound healing. First, we produced a resistant and non-degradable upper layer by lactose-mediated crosslinking of gelatin, which provided mechanical support and protection to overall design. For the lower layer, we crosslinked gelatin with citric acid, resulting in a porous matrix with a great swelling ability. In addition, we incorporated chitosan into the lower layer to harness its wound healing ability. FTIR and SEM analyses showed that lactose addition changed the secondary structure of gelatin, leading to a more compact and smoother structure than that obtained with citric acid. The hydrofilm was able to swell 384.2 ± 57.2% of its dry weight while maintaining mechanical integrity. Besides, its water vapour transmission rate was in the range of commercial dressings (1381.5 ± 108.6 g/m2·day). In vitro, cytotoxicity assays revealed excellent biocompatibility. Finally, the hydrofilm was analysed through an ex vivo wound healing assay in human skin. It achieved similar results to the control in terms of biocompatibility and wound healing, showing suitable characteristics to be used as a wound dressing.
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Affiliation(s)
- Itxaso Garcia-Orue
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 01006 Vitoria-Gasteiz, Spain
| | - Edorta Santos-Vizcaino
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 01006 Vitoria-Gasteiz, Spain
| | - Alaitz Etxabide
- BIOMAT Research Group, Chemical and Environmental Engineering Department, Engineering College of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain
| | - Jone Uranga
- BIOMAT Research Group, Chemical and Environmental Engineering Department, Engineering College of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain
| | - Ardeshir Bayat
- Plastic & Reconstructive Surgery Research, Division of Musculoskeletal & Dermatological Sciences, School of Biological Sciences, University of Manchester, M13 9PL Manchester, UK.
| | - Pedro Guerrero
- BIOMAT Research Group, Chemical and Environmental Engineering Department, Engineering College of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain
| | - Manoli Igartua
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 01006 Vitoria-Gasteiz, Spain
| | - Koro de la Caba
- BIOMAT Research Group, Chemical and Environmental Engineering Department, Engineering College of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain
| | - Rosa Maria Hernandez
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain.
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 01006 Vitoria-Gasteiz, Spain.
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Long-term expansion and differentiation of adult murine epidermal stem cells in 3D organoid cultures. Proc Natl Acad Sci U S A 2019; 116:14630-14638. [PMID: 31253707 DOI: 10.1073/pnas.1715272116] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Mammalian epidermal stem cells maintain homeostasis of the skin epidermis and contribute to its regeneration throughout adult life. While 2D mouse epidermal stem cell cultures have been established decades ago, a long-term, feeder cell- and serum-free culture system recapitulating murine epidermal architecture has not been available. Here we describe an epidermal organoid culture system that allows long-term, genetically stable expansion of adult epidermal stem cells. Our epidermal expansion media combines atypically high calcium concentrations, activation of cAMP, FGF, and R-spondin signaling with inhibition of bone morphogenetic protein (BMP) signaling. Organoids are established robustly from adult mouse skin and expand over at least 6 mo, while maintaining the basal-apical organization of the mouse interfollicular epidermis. The system represents a powerful tool to study epidermal homeostasis and disease in vitro.
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34
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Corzo-León DE, Munro CA, MacCallum DM. An ex vivo Human Skin Model to Study Superficial Fungal Infections. Front Microbiol 2019; 10:1172. [PMID: 31231322 PMCID: PMC6560176 DOI: 10.3389/fmicb.2019.01172] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 05/08/2019] [Indexed: 12/11/2022] Open
Abstract
Human skin fungal infections (SFIs) affect 25% of the world's population. Most of these infections are superficial. The main limitation of current animal models of human superficial SFIs is that clinical presentation is different between the different species and animal models do not accurately reflect the human skin environment. An ex vivo human skin model was therefore developed and standardised to accurately model SFIs. In this manuscript, we report our protocol for setting up ex vivo human skin infections and report results from a primary superficial skin infection with Trichophyton rubrum, an anthropophilic fungus. The protocol includes a detailed description of the methodology to prepare the skin explants, establish infection, avoid contamination, and obtain high quality samples for further downstream analyses. Scanning electronic microscopy (SEM), histology and fluorescent microscopy were applied to evaluate skin cell viability and fungal morphology. Furthermore, we describe a broad range of assays, such as RNA extraction and qRT-PCR for human gene expression, and protein extraction from tissue and supernatants for proteomic analysis by liquid chromatography-mass spectrometry (LC-MS/MS). Non-infected skin was viable after 14 days of incubation, expressed genes and contained proteins associated with proliferative, immune and differentiation functions. The macroscopic damage caused by T. rubrum had a similar appearance to the one expected in clinical settings. Finally, using this model, the host response to T. rubrum infection can be evaluated at different levels.
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Affiliation(s)
| | | | - Donna M. MacCallum
- MRC Centre for Medical Mycology at the University of Aberdeen, Institute of Medical Sciences, Aberdeen, United Kingdom
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35
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Rouillé T, Aractingi S, Kadlub N, Fraitag S, How-Kit A, Daunay A, Hivelin M, Moguelet P, Picard A, Fontaine RH, Guégan S. Local Inhibition of MEK/Akt Prevents Cellular Growth in Human Congenital Melanocytic Nevi. J Invest Dermatol 2019; 139:2004-2015.e13. [PMID: 31059696 DOI: 10.1016/j.jid.2019.03.1156] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 03/20/2019] [Accepted: 03/26/2019] [Indexed: 12/15/2022]
Abstract
The management of large congenital melanocytic nevi (lCMN) is based exclusively on iterative surgical procedures in the absence of validated medical therapy. The aim of our study was to develop an intra-lesional medical treatment for lCMN. Seventeen patients harboring NRAS-mutated lCMN were included. Nevocytes obtained from lCMN displayed an overactivation of mitogen-activated protein kinase and phosphoinositide 3-kinase (Akt) pathways. Mitogen-activated protein kinase/extracellular signal-regulated kinase (MEK) and Akt inhibitors reduced the nevosphere diameter in sphere-forming assays, as well as cell viability and proliferation in in vitro assays. Standardized lCMN explants were then cultured ex vivo with the same inhibitors, which induced a decrease in MelanA+ and Sox10+ cells in both epidermis and dermis. Finally, intradermal injections of these inhibitors were administered within standardized lCMN xenografts in Rag2-/- mice. They induced a dramatic decrease in nevocytes in treated xenografts, which persisted 30 days after the end of treatment. Using original nevus explant and xenograft preclinical models, we demonstrated that intradermal MEK/Akt inhibition might serve as neoadjuvant therapy for the treatment of NRAS-mutated congenital melanocytic nevi to avoid iterative surgeries.
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Affiliation(s)
- Thomas Rouillé
- Saint-Antoine Research Center, INSERM UMRS_938, Paris, France; Sorbonne Université, Paris, France
| | - Selim Aractingi
- Saint-Antoine Research Center, INSERM UMRS_938, Paris, France; Université Paris-Descartes, Paris, France; AP-HP, Hôpital Cochin, Department of Dermatology, Paris, France
| | - Natacha Kadlub
- Université Paris-Descartes, Paris, France; AP-HP, Hôpital Necker-Enfants-Malades, Department of Maxillofacial and Plastic Surgery, Paris, France
| | - Sylvie Fraitag
- AP-HP, Hôpital Necker-Enfants-Malades, Department of Pathology, Paris, France
| | - Alexandre How-Kit
- Laboratory for Functional Genomics, Fondation Jean Dausset-CEPH, Paris, France
| | - Antoine Daunay
- Laboratory for Functional Genomics, Fondation Jean Dausset-CEPH, Paris, France
| | - Mikael Hivelin
- Université Paris-Descartes, Paris, France; AP-HP, Hôpital Européen Georges-Pompidou, Department of Plastic Surgery, Paris, France
| | | | - Arnaud Picard
- Université Paris-Descartes, Paris, France; AP-HP, Hôpital Necker-Enfants-Malades, Department of Maxillofacial and Plastic Surgery, Paris, France
| | - Romain H Fontaine
- Saint-Antoine Research Center, INSERM UMRS_938, Paris, France; Sorbonne Université, Paris, France
| | - Sarah Guégan
- Saint-Antoine Research Center, INSERM UMRS_938, Paris, France; Université Paris-Descartes, Paris, France; AP-HP, Hôpital Cochin, Department of Dermatology, Paris, France.
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36
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Nestin + progenitor cells isolated from adult human sweat gland stroma promote reepithelialisation and may stimulate angiogenesis in wounded human skin ex vivo. Arch Dermatol Res 2019; 311:325-330. [PMID: 30798352 PMCID: PMC6469855 DOI: 10.1007/s00403-019-01889-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 12/11/2018] [Accepted: 12/17/2018] [Indexed: 12/22/2022]
Abstract
The combination of an aging population and an increasing prevalence of diseases associated with impaired-wound healing, including obesity, peripheral vascular disease and diabetes, is likely to result in a dramatic increase in the incidence and prevalence of chronic skin wounds. Indeed, systemic reviews are now not only trying to establish both the prevalence and the often under-estimated socio-economic costs of chronic skin wounds, but most importantly are addressing the impact that chronic wounds have on quality of life. Given the clear need for novel approaches to the management of chronic skin ulceration, ideally developed and tested in the human system in a manner that can be rapidly translated into clinical practice, we examined the effects of multipotent primary human nestin+ progenitor cells on human wound healing in an ex vivo model. Human sweat gland-derived nestin+ cells demonstrated the capacity to significantly promote two key wound healing parameters, i.e., both reepithelialisation and angiogenesis in experimentally wounded, organ-cultured human skin. The current data further support the use of full-thickness human skin wound-healing models ex vivo to pre-clinically test wound healing-promoting candidate agents. Whilst larger studies are required to substantiate a firm “proof-of-concept,” our preliminary studies encourage further efforts to systemically determine the potential of cell-based regenerative medicine strategies in general, and the use of skin appendage-associated human nestin+ cells in particular, as novel treatment strategies for chronic skin ulceration.
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Nicoletti G, Saler M, Villani L, Rumolo A, Tresoldi MM, Faga A. Platelet Rich Plasma Enhancement of Skin Regeneration in an ex-vivo Human Experimental Model. Front Bioeng Biotechnol 2019; 7:2. [PMID: 30701173 PMCID: PMC6343075 DOI: 10.3389/fbioe.2019.00002] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 01/03/2019] [Indexed: 02/04/2023] Open
Abstract
This study reports on the development of an original, ex-vivo wounded skin culture protocol using autologous Platelet Rich Plasma (PRP) and enriched Dulbecco's Modified Eagle's Medium (DMEM). Human skin samples obtained from specimens harvested during reduction mammoplasty procedures, were injured in their central portion—to create a standard wound—and cultured under three different conditions: – enriched DMEM with saline solution in the central wound (control) – enriched DMEM with the same medium in the central wound – enriched DMEM plus 2.5% autologous PRP, with the same PRP added medium in the central wound. Morphological analysis was carried out at 0 h (T0) and on days 1, 3, 5 and 10 (T1-T3-T5-T10) using Hematoxylin and Eosin; Masson's trichrome staining; Weigert staining and Ki-67 staining to identify the skin histological features in the different experimental conditions. The combination of DMEM and PRP allowed a favorable modulation of the epithelial cells and fibroblasts proliferation, and a relevant anti-inflammatory action. PRP also demonstrated an inhibitory effect on both the collagen and elastic fibers' de-structuration and a favorable modulation of the re-organization of these fibers. The step by step histological and immune-histo-chemical regenerative effects of PRP on human skin wound repair and regeneration process was observed over a period of 10 days.
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Affiliation(s)
- Giovanni Nicoletti
- Plastic and Reconstructive Surgery, Department of Clinical Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy.,Advanced Technologies for Regenerative Medicine and Inductive Surgery Research Center, University of Pavia, Pavia, Italy.,Plastic and Reconstructive Surgery Unit, Department of Surgery, Istituti Clinici Scientifici Maugeri, Pavia, Italy
| | - Marco Saler
- Plastic and Reconstructive Surgery, Department of Clinical Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
| | - Laura Villani
- Pathological Anatomy and Histology Unit, Istituti Clinici Scientifici Maugeri, Pavia, Italy
| | - Agnese Rumolo
- Plastic and Reconstructive Surgery, Department of Clinical Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
| | - Marco Mario Tresoldi
- Plastic and Reconstructive Surgery, Department of Clinical Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy.,Plastic and Reconstructive Surgery Unit, Department of Surgery, Istituti Clinici Scientifici Maugeri, Pavia, Italy
| | - Angela Faga
- Advanced Technologies for Regenerative Medicine and Inductive Surgery Research Center, University of Pavia, Pavia, Italy.,Plastic and Reconstructive Surgery Unit, Department of Surgery, Istituti Clinici Scientifici Maugeri, Pavia, Italy.,Department of Molecular Medicine, University of Pavia, Pavia, Italy
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38
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Nasir NAM, Paus R, Ansell DM. Fluorescent cell tracer dye permits real-time assessment of re-epithelialization in a serum-free ex vivo human skin wound assay. Wound Repair Regen 2018; 27:126-133. [DOI: 10.1111/wrr.12688] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 10/29/2018] [Accepted: 11/10/2018] [Indexed: 11/27/2022]
Affiliation(s)
- Nur Azida Mohd Nasir
- Centre for Dermatology Research, School of Biological Sciences; The University of Manchester; Manchester United Kingdom
- School of Medical Sciences; Universiti Sains Malaysia; Kubang Kerian Malaysia
| | - Ralf Paus
- Centre for Dermatology Research, School of Biological Sciences; The University of Manchester; Manchester United Kingdom
- NIHR Manchester Biomedical Research Centre, The University of Manchester; Manchester United Kingdom
- Manchester Academic Health Sciences Centre, The University of Manchester; Manchester United Kingdom
| | - David M. Ansell
- Centre for Dermatology Research, School of Biological Sciences; The University of Manchester; Manchester United Kingdom
- Division of Cell Matrix Biology and Regenerative Medicine; The University of Manchester; Manchester United Kingdom
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39
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Langan EA, Fink T, Paus R. Is prolactin a negative neuroendocrine regulator of human skin re-epithelisation after wounding? Arch Dermatol Res 2018; 310:833-841. [PMID: 30244404 DOI: 10.1007/s00403-018-1864-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 08/27/2018] [Accepted: 09/03/2018] [Indexed: 12/29/2022]
Abstract
Chronic wounds remain a major unmet healthcare challenge, associated with substantial morbidity and economic costs. Therefore, novel treatment strategies and therapeutic approaches need to be urgently developed. Yet, despite the increasingly recognized importance of neurohormonal signaling in skin physiology, the neuroendocrine regulation of cutaneous wound healing has received surprisingly little attention. Human skin, and its appendages, locally express the pleiotropic neurohormone prolactin (PRL), which not only regulates lactation but also hair follicle cycling, angiogenesis, keratinocyte proliferation, and epithelial stem cell functions. Therefore, we examined the effects of PRL in experimentally wounded female human skin organ culture. Overall, this revealed that PRL slightly, but significantly, inhibited epidermal regeneration (reepithelialisation), cytokeratin 6 protein expression and intraepidermal mitochondrial activity (MTCO1 expression), while it promoted keratinocyte terminal differentiation (i.e. involucrin expression) ex vivo. If the current pilot data are confirmed by further studies, PRL may serve as one of the-rarely studied-negative regulators of cutaneous wound healing that control excessive reepithelialisation. This raises the intriguing and clinically relevant question of whether PRL receptor antagonists could actually promote epidermal repair after human skin wounding.
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Affiliation(s)
- E A Langan
- Department of Dermatology, University of Luebeck, Luebeck, Germany.,Centre for Dermatology Research, University of Manchester, Manchester, UK
| | - T Fink
- Department of Dermatology, Klinikum Oldenburg, Oldenburg, Germany
| | - R Paus
- Centre for Dermatology Research, University of Manchester, Manchester, UK. .,Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, FL, USA.
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40
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Neves LMG, Parizotto NA, Cominetti MR, Bayat A. Photobiomodulation of a flowable matrix in a human skin ex vivo model demonstrates energy-based enhancement of engraftment integration and remodeling. JOURNAL OF BIOPHOTONICS 2018; 11:e201800077. [PMID: 29688627 DOI: 10.1002/jbio.201800077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 04/19/2018] [Indexed: 06/08/2023]
Abstract
The use of dermal substitutes to treat skin defects such as ulcers has shown promising results, suggesting a potential role for skin substitutes for treating acute and chronic wounds. One of the main drawbacks with the use of dermal substitutes is the length of time from engraftment to graft take, plus the risk of contamination and failure due to this prolonged integration. Therefore, the use of adjuvant energy-based therapeutic modalities to augment and accelerate the rate of biointegration by dermal substitute engraftments is a desirable outcome. The photobiomodulation (PBM) therapy modulates the repair process, by stimulating cellular proliferation and angiogenesis. Here, we evaluated the effect of PBM on a collagen-glycosaminoglycan flowable wound matrix (FWM) in an ex vivo human skin wound model. PBM resulted in accelerated rate of re-epithelialization and organization of matrix as seen by structural arrangement of collagen fibers, and a subsequent increased expression of alpha-smooth muscle actin (α-SMA) and vascular endothelial growth factor A (VEGF-A) leading to an overall improved healing process. The use of PBM promoted a beneficial effect on the rate of integration and healing of FWM. We therefore propose that the adjuvant use of PBM may have utility in enhancing engraftment and tissue repair and be of value in clinical practice.
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Affiliation(s)
- Lia M G Neves
- Laboratory of Biology of Aging (LABEN), Department of Gerontology, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Nivaldo A Parizotto
- Physical Therapy Department, Federal University of São Carlos, São Carlos, SP, Brazil
- Biotechnology Post-Graduation Program, University of Araraquara, Araraquara, Brazil
- Post-Graduation in Biomedical Engineering, University of Brazil, São Paulo, SP, Brazil
| | - Marcia R Cominetti
- Laboratory of Biology of Aging (LABEN), Department of Gerontology, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Ardeshir Bayat
- School of Biological Sciences and Health/Division of Musculoskeletal and Dermatological Sciences, University of Manchester, Manchester, UK
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41
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Pastar I, Wong LL, Egger AN, Tomic-Canic M. Descriptive vs mechanistic scientific approach to study wound healing and its inhibition: Is there a value of translational research involving human subjects? Exp Dermatol 2018; 27:551-562. [PMID: 29660181 PMCID: PMC6374114 DOI: 10.1111/exd.13663] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2018] [Indexed: 12/12/2022]
Abstract
The clinical field of wound healing is challenged by numerous hurdles. Not only are wound-healing disorders complex and multifactorial, but the corresponding patient population is diverse, often elderly and burdened by multiple comorbidities such as diabetes and cardiovascular disease. The care of such patients requires a dedicated, multidisciplinary team of physicians, surgeons, nurses and scientists. In spite of the critical clinical need, it has been over 15 years since a treatment received approval for efficacy by the FDA in the United States. Among the reasons contributing to this lack of effective new treatment modalities is poor understanding of mechanisms that inhibit healing in patients. Additionally, preclinical models do not fully reflect the disease complexity of the human condition, which brings us to a paradox: if we are to use a "mechanistic" approach that favours animal models, we can dissect specific mechanisms using advanced genetic, molecular and cellular technologies, with the caveat that it may not be directly applicable to patients. Traditionally, scientific review panels, for either grant funding or manuscript publication purposes, favour such "mechanistic" approaches whereby human tissue analyses, deemed "descriptive" science, are characterized as a "fishing expedition" and are considered "fatally flawed." However, more emerging evidence supports the notion that the use of human samples provides significant new knowledge regarding the molecular and cellular mechanisms that control wound healing and contribute to inhibition of the process in patients. Here, we discuss the advances, benefits and challenges of translational research in wound healing focusing on human subject research.
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Affiliation(s)
- Irena Pastar
- Wound Healing and Regenerative Medicine Research Program, Department of Dermatology and Cutaneous Surgery, University of Miami Miller School Of Medicine, Miami, FL, USA
| | - Lulu L Wong
- Wound Healing and Regenerative Medicine Research Program, Department of Dermatology and Cutaneous Surgery, University of Miami Miller School Of Medicine, Miami, FL, USA
| | - Andjela N Egger
- Wound Healing and Regenerative Medicine Research Program, Department of Dermatology and Cutaneous Surgery, University of Miami Miller School Of Medicine, Miami, FL, USA
| | - Marjana Tomic-Canic
- Wound Healing and Regenerative Medicine Research Program, Department of Dermatology and Cutaneous Surgery, University of Miami Miller School Of Medicine, Miami, FL, USA
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42
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Glinos GD, Verne SH, Aldahan AS, Liang L, Nouri K, Elliot S, Glassberg M, Cabrera DeBuc D, Koru-Sengul T, Tomic-Canic M, Pastar I. Optical coherence tomography for assessment of epithelialization in a human ex vivo wound model. Wound Repair Regen 2018; 25:1017-1026. [PMID: 29235208 DOI: 10.1111/wrr.12600] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 11/22/2017] [Indexed: 12/24/2022]
Abstract
The ex vivo human skin wound model is a widely accepted model to study wound epithelialization. Due to a lack of animal models that fully replicate human conditions, the ex vivo model is a valuable tool to study mechanisms of wound reepithelialization, as well as for preclinical testing of novel therapeutics. The current standard for assessment of wound healing in this model is histomorphometric analysis, which is labor intensive, time consuming, and requires multiple biological and technical replicates in addition to assessment of different time points. Optical coherence tomography (OCT) is an emerging noninvasive imaging technology originally developed for noninvasive retinal scans that avoids the deleterious effects of tissue processing. This study investigated OCT as a novel method for assessing reepithelialization in the human ex vivo wound model. Excisional ex vivo wounds were created, maintained at air-liquid interface, and healing progression was assessed at days 4 and 7 with OCT and histology. OCT provided adequate resolution to identify the epidermis, the papillary and reticular dermis, and importantly, migrating epithelium in the wound bed. We have deployed OCT as a noninvasive tool to produce, longitudinal "optical biopsies" of ex vivo human wound healing process, and we established an optimal quantification method of re-epithelialization based on en face OCT images of the total wound area. Pairwise statistical analysis of OCT and histology based quantifications for the rate of epithelialization have shown the feasibility and superiority of OCT technology for noninvasive monitoring of human wound epithelialization. Furthermore, we have utilized OCT to evaluate therapeutic potential of allogeneic adipose stem cells revealing their ability to promote reepithelialization in human ex vivo wounds. OCT technology is promising for its applications in wound healing and evaluation of novel therapeutics in both the laboratory and the clinical settings.
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Affiliation(s)
- George D Glinos
- Department of Dermatology and Cutaneous Surgery, Wound Healing and Regenerative Medicine Research Program, Miami, Florida
| | - Sebastian H Verne
- Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida
| | - Adam S Aldahan
- Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida
| | - Liang Liang
- Department of Dermatology and Cutaneous Surgery, Wound Healing and Regenerative Medicine Research Program, Miami, Florida
| | - Keyvan Nouri
- Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida
| | - Sharon Elliot
- Department of Surgery, University of Miami Miller School of Medicine, Miami, Florida
| | - Marilyn Glassberg
- Department of Surgery, University of Miami Miller School of Medicine, Miami, Florida.,Department of Medicine, University of Miami Miller School of Medicine, Miami, Florida
| | - Delia Cabrera DeBuc
- Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, Florida
| | - Tulay Koru-Sengul
- Department of Public Health Sciences, University of Miami Miller School of Medicine, Miami, Florida
| | - Marjana Tomic-Canic
- Department of Dermatology and Cutaneous Surgery, Wound Healing and Regenerative Medicine Research Program, Miami, Florida
| | - Irena Pastar
- Department of Dermatology and Cutaneous Surgery, Wound Healing and Regenerative Medicine Research Program, Miami, Florida
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Nicoletti G, Saler M, Pellegatta T, Tresoldi MM, Bonfanti V, Malovini A, Faga A, Riva F. Ex vivo regenerative effects of a spring water. Biomed Rep 2017; 7:508-514. [PMID: 29188053 PMCID: PMC5702968 DOI: 10.3892/br.2017.1002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 09/14/2017] [Indexed: 12/02/2022] Open
Abstract
Previous experiments by our group have indicated the regenerative effects of a spring water (Comano), which was possibly associated with the native non-pathogenic bacterial flora. The present study aimed to confirm these regenerative properties in a human ex vivo experimental model in the context of physiological wound healing. Human 6-mm punch skin biopsies harvested during plastic surgery sessions were injured in their central portion to induce skin loss and were cultured in either conventional medium (controls) or medium powder reconstituted with filtered Comano spring water (treated samples). At 24, 48 and 72 h the specimens were observed following staining with hematoxylin and eosin, Picrosirius Red, orcein and anti-proliferating cell nuclear antigen. Compared with the controls, the treated samples exhibited reduced overall cell infiltration, evidence of fibroblasts, stimulation of cell proliferation and collagen and elastic fiber regeneration. In the spring water, in addition to 12 resident non-pathogenic bacterial strains exhibiting favorable metabolic activities, more unknown non-pathogenic species are being identified by genomic analysis. In the present study, the efficacy of this ‘germ-free’, filtered spring water in wound regeneration was indicated. Thus, the Comano spring water microbiota should be acknowledged for its regenerative properties.
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Affiliation(s)
- Giovanni Nicoletti
- Plastic and Reconstructive Surgery, Department of Clinical-Surgical Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy.,Advanced Technologies for Regenerative Medicine and Inductive Surgery Research Center, University of Pavia, 27100 Pavia, Italy.,Plastic and Reconstructive Surgery Unit, Salvatore Maugeri Research and Care Institute, 27100 Pavia, Italy
| | - Marco Saler
- Plastic and Reconstructive Surgery, Department of Clinical-Surgical Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy
| | - Tommaso Pellegatta
- Plastic and Reconstructive Surgery, Department of Clinical-Surgical Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy
| | - Marco Mario Tresoldi
- Plastic and Reconstructive Surgery, Department of Clinical-Surgical Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy.,Plastic and Reconstructive Surgery Unit, Salvatore Maugeri Research and Care Institute, 27100 Pavia, Italy
| | - Viola Bonfanti
- Plastic and Reconstructive Surgery, Department of Clinical-Surgical Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy
| | - Alberto Malovini
- Laboratory of Informatics and Systems Engineering for Clinical Research, Istituti Clinici Scientifici Maugeri, 27100 Pavia, Italy
| | - Angela Faga
- Plastic and Reconstructive Surgery, Department of Clinical-Surgical Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy.,Advanced Technologies for Regenerative Medicine and Inductive Surgery Research Center, University of Pavia, 27100 Pavia, Italy.,Plastic and Reconstructive Surgery Unit, Salvatore Maugeri Research and Care Institute, 27100 Pavia, Italy
| | - Federica Riva
- Advanced Technologies for Regenerative Medicine and Inductive Surgery Research Center, University of Pavia, 27100 Pavia, Italy.,Department of Public Health, Experimental and Forensic Medicine, Histology and Embryology Unit, University of Pavia, 27100 Pavia, Italy
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44
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Boekema B, Ulrich MM, Middelkoop E. Models for cutaneous wound healing. Wound Repair Regen 2017; 25:347-348. [DOI: 10.1111/wrr.12545] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 04/28/2017] [Indexed: 12/30/2022]
Affiliation(s)
- Bouke Boekema
- Research, Association of Dutch Burn Centers (ADBC), Beverwijk; the Netherlands
| | - Magda M.W. Ulrich
- Research, Association of Dutch Burn Centers (ADBC), Beverwijk; the Netherlands
- Department of Molecular Cell Biology and Immunology; VU University Medical Center, Amsterdam; the Netherlands
| | - Esther Middelkoop
- Research, Association of Dutch Burn Centers (ADBC), Beverwijk; the Netherlands
- Department of Molecular Cell Biology and Immunology; VU University Medical Center, Amsterdam; the Netherlands
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45
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Lipid functions in skin: Differential effects of n-3 polyunsaturated fatty acids on cutaneous ceramides, in a human skin organ culture model. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1679-1689. [PMID: 28341437 PMCID: PMC5504780 DOI: 10.1016/j.bbamem.2017.03.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 03/16/2017] [Accepted: 03/19/2017] [Indexed: 12/31/2022]
Abstract
Ceramides are important for skin health, with a multitude of species found in both dermis and epidermis. The epidermis contains linoleic acid-Ester-linked Omega-hydroxylated ceramides of 6-Hydroxy-sphingosine, Sphingosine and Phytosphingosine bases (CER[EOH], CER[EOS] and CER[EOP], respectively), that are crucial for the formation of the epidermal barrier, conferring protection from environmental factors and preventing trans-epidermal water loss. Furthermore, a large number of ceramides, derivatives of the same sphingoid bases and various fatty acids, are produced by dermal and epidermal cells and perform signalling roles in cell functions ranging from differentiation to apoptosis. Supplementation with the n-3 polyunsaturated fatty acids (PUFA) eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have shown promise as therapeutic agents in a number of inflammatory skin conditions, altering the lipid profile of the skin and production of bioactive lipids such as the eicosanoids, docosanoids and endocannabinoids. In this study we wished to investigate whether EPA and DHA could also affect the ceramide profile in epidermis and dermis, and, in this way, contribute to formation of a robust lipid barrier and ceramide-mediated regulation of skin functions. Ex vivo skin explants were cultured for 6 days, and supplemented with EPA or DHA (50 μM). Liquid chromatography coupled to tandem mass spectrometry with electrospray ionisation was used to assess the prevalence of 321 individual ceramide species, and a number of sphingoid bases, phosphorylated sphingoid bases, and phosphorylated ceramides, within the dermis and epidermis. EPA augmented dermal production of members of the ceramide families containing Non-hydroxy fatty acids and Sphingosine or Dihydrosphingosine bases (CER[NS] and CER[NDS], respectively), while epidermal CER[EOH], CER[EOS] and CER[EOP] ceramides were not affected. DHA did not significantly affect ceramide production. Ceramide-1-phosphate levels in the epidermis, but not the dermis, increased in response to EPA, but not DHA. This ex vivo study shows that dietary supplementation with EPA has the potential to alter the ceramide profile of the skin, and this may contribute to its anti-inflammatory profile. This has implications for formation of the epidermal lipid barrier, and signalling pathways within the skin mediated by ceramides and other sphingolipid species. This article is part of a Special Issue entitled: Membrane Lipid Therapy: Drugs Targeting Biomembranes edited by Pablo V. Escribá. Omega-3 fatty acid supplementation alters ex vivo skin ceramide profiles Eicosapentaenoic acid (EPA) increases dermal ceramides with non-hydroxy fatty acids (CER[NS] and CER[NDS]) EPA increases ceramide-1-phosphate (C1P) in the epidermis but not dermis Long-chain linoleic-acid-containing ceramides were unaltered by EPA or docosahexaenoic acid (DHA)
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Ud-Din S, Bayat A. Non-animal models of wound healing in cutaneous repair: In silico, in vitro, ex vivo, and in vivo models of wounds and scars in human skin. Wound Repair Regen 2017; 25:164-176. [DOI: 10.1111/wrr.12513] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 12/15/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Sara Ud-Din
- Plastic and Reconstructive Surgery Research, Centre for Dermatology Research; University of Manchester; Manchester United Kingdom
| | - Ardeshir Bayat
- Plastic and Reconstructive Surgery Research, Centre for Dermatology Research; University of Manchester; Manchester United Kingdom
- Bioengineering Research Group, School of Materials, Faculty of Engineering & Physical Sciences; The University of Manchester; Manchester United Kingdom
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Weinreb M, Nemcovsky CE. In vitro models for evaluation of periodontal wound healing/regeneration. Periodontol 2000 2017; 68:41-54. [PMID: 25867978 DOI: 10.1111/prd.12079] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/25/2014] [Indexed: 12/14/2022]
Abstract
Periodontal wound healing and regeneration are highly complex processes, involving cells, matrices, molecules and genes that must be properly choreographed and orchestrated. As we attempt to understand and influence these clinical entities, we need experimental models to mimic the various aspects of human wound healing and regeneration. In vivo animal models that simulate clinical situations of humans can be costly and cumbersome. In vitro models have been devised to dissect wound healing/regeneration processes into discrete, analyzable steps. For soft tissue (e.g. gingival) healing, in vitro models range from simple culture of cells grown in monolayers and exposed to biological modulators or physical effectors and materials, to models in which cells are 'injured' by scraping and subsequently the 'wound' is filled with new or migrating cells, to three-dimensional models of epithelial-mesenchymal recombination or tissue explants. The cells employed are gingival keratinocytes, fibroblasts or endothelial cells, and their proliferation, migration, attachment, differentiation, survival, gene expression, matrix production or capillary formation are measured. Studies of periodontal regeneration also include periodontal ligament fibroblasts or progenitors, osteoblasts or osteoprogenitors, and cementoblasts. Regeneration models measure cellular proliferation, attachment and migration, as well as gene expression, transfer and differentiation into a mineralizing phenotype and biomineralization. Only by integrating data from models on all levels (i.e. a single cell to the whole organism) can various critical aspects of periodontal wound healing/regeneration be fully evaluated.
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S100A12 Induced in the Epidermis by Reduced Hydration Activates Dermal Fibroblasts and Causes Dermal Fibrosis. J Invest Dermatol 2016; 137:650-659. [PMID: 27840235 DOI: 10.1016/j.jid.2016.10.040] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 10/05/2016] [Accepted: 10/26/2016] [Indexed: 12/16/2022]
Abstract
Disruption of the barrier function of skin increases transepidermal water loss and up-regulates inflammatory pathways in the epidermis. Consequently, sustained expression of proinflammatory cytokines from the epidermis is associated with dermal scarring. We found increased expression of S100A12 in the epidermis of human hypertrophic and keloid scar. Exposing a stratified keratinocyte culture to a reduced-hydration environment increased the expression and secretion of S100A12 by nearly 70%, which in turn activated dermal fibroblasts in vitro. Direct treatment of fibroblasts with conditioned medium collected from stratified keratinocyte culture under reduced-hydration conditions activated fibroblasts, shown by up-regulation of α-smooth muscle actin, pro-collagen 1, and F-actin expression. However, this fibroblast activation was not found when S100A12 was knocked down by RNA interference in keratinocytes. Pharmacological blockade of S100A12 receptors, RAGE, or TLR4 inhibited S100A12-induced fibroblast activation. Local delivery of S100A12 resulted in a marked hypertrophic scar formation in a validated rabbit hypertrophic scar model compared with saline control. Our findings indicate that S100A12 functions as a proinflammatory cytokine and suggest that S100A12 is a potential therapeutic target for dermal scarring.
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Xu W, Hong SJ, Zhong A, Xie P, Jia S, Xie Z, Zeitchek M, Niknam-Bienia S, Zhao J, Porterfield DM, Surmeier DJ, Leung KP, Galiano RD, Mustoe TA. Sodium channel Nax is a regulator in epithelial sodium homeostasis. Sci Transl Med 2016; 7:312ra177. [PMID: 26537257 DOI: 10.1126/scitranslmed.aad0286] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The mechanisms by which the epidermis responds to disturbances in barrier function and restores homeostasis are unknown. With a perturbation of the epidermal barrier, water is lost, resulting in an increase in extracellular sodium concentration. We demonstrate that the sodium channel Nax functions as a sodium sensor. With increased extracellular sodium, Nax up-regulates prostasin, which results in activation of the sodium channel ENaC, resulting in increased sodium flux and increased downstream mRNA synthesis of inflammatory mediators. Nax is present in multiple epithelial tissues, and up-regulation of its downstream genes is found in hypertrophic scars. In animal models, blocking Nax expression results in improvement in scarring and atopic dermatitis-like symptoms, both of which are pathological conditions characterized by perturbations in barrier function. These findings support an important role for Nax in maintaining epithelial homeostasis.
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Affiliation(s)
- Wei Xu
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Seok Jong Hong
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Aimei Zhong
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA. Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China
| | - Ping Xie
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Shengxian Jia
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Zhong Xie
- Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Michael Zeitchek
- Department of Agricultural and Biological Engineering, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Solmaz Niknam-Bienia
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Jingling Zhao
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA. Department of Burns, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, China
| | - D Marshall Porterfield
- Department of Agricultural and Biological Engineering, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - D James Surmeier
- Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Kai P Leung
- Microbiology Branch, U.S. Army Dental and Trauma Research Detachment, Institute of Surgical Research, JB Fort Sam Houston, San Antonio, TX 78234, USA
| | - Robert D Galiano
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Thomas A Mustoe
- Laboratory for Wound Repair and Regenerative Surgery, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.
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Zhong A, Xu W, Zhao J, Xie P, Jia S, Sun J, Galiano RD, Mustoe TA, Hong SJ. S100A8 and S100A9 Are Induced by Decreased Hydration in the Epidermis and Promote Fibroblast Activation and Fibrosis in the Dermis. THE AMERICAN JOURNAL OF PATHOLOGY 2016; 186:109-22. [DOI: 10.1016/j.ajpath.2015.09.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 09/23/2015] [Accepted: 09/28/2015] [Indexed: 12/25/2022]
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