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Young M, du Plessis JL, Kezic S, Jakasa I, Franken A. Natural moisturising factor constituents in South African nursing students. Contact Dermatitis 2024; 90:378-384. [PMID: 38254239 DOI: 10.1111/cod.14498] [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: 10/16/2023] [Revised: 12/20/2023] [Accepted: 12/21/2023] [Indexed: 01/24/2024]
Abstract
BACKGROUND The majority of South African healthcare workers are Black Africans with dark-pigmented skin. Studies on how the markers of skin barrier function and natural moisturising factor (NMF) compare between dark and light-pigmented skin are limited. Quantifying NMF in a nursing student population during their practical training at university may provide valuable insight into their potential susceptibility to skin conditions associated with low NMF. OBJECTIVES The objectives of this study were to quantify and compare NMF content of Black African, Mixed Race and White nursing students from their dominant dorsal hand. METHODS Forty-nine White, 32 Black African and 5 Mixed Race nursing students participated in this study. Tape strip samples were collected from the participants' dominant dorsal hand and NMF content was measured, including histidine (HIS), pyrrolidone carboxylic acid (PCA), trans-urocanic acid (t-UCA) and cis-urocanic acid (c-UCA), as well as cytokines interleukin-1 alpha (IL-1α) and interleukin-1 receptor antagonist (IL-1RA). RESULTS No statistically significant differences in PCA, t-UCA, c-UCA, IL-1α or IL-1RA were found between Black African and White nursing students. HIS was significantly (p = 0.001) higher in White nursing students when compared to Black African students. The ratio of tot-UCA/HIS was significantly higher in Black Africans (p = 0.0002) when compared to White nursing students. CONCLUSION No significant differences were established in NMF content between White and Black African nursing students, other than HIS which was significantly higher in White students than in Black African students. Different HIS levels between the racial groups suggest variation in histidase activity which may be related to skin pH and pigmentation. This finding may suggest that nursing students at the beginning of their careers may have similar susceptibility to skin diseases related to NMF.
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Affiliation(s)
- Monica Young
- Occupational Hygiene and Health Research Initiative (OHHRI), Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Johannes Lodewykus du Plessis
- Occupational Hygiene and Health Research Initiative (OHHRI), Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Sanja Kezic
- Public and Occupational Health Department, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Ivone Jakasa
- Laboratory for Analytical Chemistry, Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
| | - Anja Franken
- Occupational Hygiene and Health Research Initiative (OHHRI), Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
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Tan SH, Liu S, Teoh SH, Bonnard C, Leavesley D, Liang K. A sustainable strategy for generating highly stable human skin equivalents based on fish collagen. BIOMATERIALS ADVANCES 2024; 158:213780. [PMID: 38280287 DOI: 10.1016/j.bioadv.2024.213780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 12/20/2023] [Accepted: 01/17/2024] [Indexed: 01/29/2024]
Abstract
Tissue engineered skin equivalents are increasingly recognized as potential alternatives to traditional skin models such as human ex vivo skin or animal skin models. However, most of the currently investigated human skin equivalents (HSEs) are constructed using mammalian collagen which can be expensive and difficult to extract. Fish skin is a waste product produced by fish processing industries and identified as a cost-efficient and sustainable source of type I collagen. In this work, we describe a method for generating highly stable HSEs based on fibrin fortified tilapia fish collagen. The fortified fish collagen (FFC) formulation is optimized to enable reproducible fabrication of full-thickness HSEs that undergo limited contraction, facilitating the incorporation of human donor-derived skin cells and formation of biomimetic dermal and epidermal layers. The morphology and barrier function of the FFC HSEs are compared with a commercial skin model and validated with immunohistochemical staining and transepithelial electrical resistance testing. Finally, the potential of a high throughput screening platform with FFC HSE is explored by scaling down its fabrication to 96-well format.
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Affiliation(s)
- Shi Hua Tan
- A*STAR Skin Research Labs (A*SRL), Agency for Science, Technology and Research (A*STAR), Singapore
| | - Shaoqiong Liu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
| | - Swee Hin Teoh
- College of Materials Science and Engineering, Hunan University, People's Republic of China
| | - Carine Bonnard
- A*STAR Skin Research Labs (A*SRL), Agency for Science, Technology and Research (A*STAR), Singapore; Skin Research Institute of Singapore (SRIS), Singapore
| | | | - Kun Liang
- A*STAR Skin Research Labs (A*SRL), Agency for Science, Technology and Research (A*STAR), Singapore; Skin Research Institute of Singapore (SRIS), Singapore.
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Rimal R, Muduli S, Desai P, Marquez AB, Möller M, Platzman I, Spatz J, Singh S. Vascularized 3D Human Skin Models in the Forefront of Dermatological Research. Adv Healthc Mater 2024; 13:e2303351. [PMID: 38277705 DOI: 10.1002/adhm.202303351] [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: 10/02/2023] [Revised: 12/04/2023] [Indexed: 01/28/2024]
Abstract
In vitro engineered skin models are emerging as an alternative platform to reduce and replace animal testing in dermatological research. Despite the progress made in recent years, considerable challenges still exist for the inclusion of diverse cell types within skin models. Blood vessels, in particular, are essential in maintaining tissue homeostasis and are one of many primary contributors to skin disease inception and progression. Substantial efforts in the past have allowed the successful fabrication of vascularized skin models that are currently utilized for disease modeling and drugs/cosmetics testing. This review first discusses the need for vascularization within tissue-engineered skin models, highlighting their role in skin grafting and disease pathophysiology. Second, the review spotlights the milestones and recent progress in the fabrication and utilization of vascularized skin models. Additionally, advances including the use of bioreactors, organ-on-a-chip devices, and organoid systems are briefly explored. Finally, the challenges and future outlook for vascularized skin models are addressed.
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Affiliation(s)
- Rahul Rimal
- Max-Planck-Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
- DWI Leibniz Institute for Interactive Materials e.V, RWTH Aachen University, Forckenbeckstrasse 50, 52074, Aachen, Germany
| | - Saradaprasan Muduli
- Max-Planck-Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
| | - Prachi Desai
- DWI Leibniz Institute for Interactive Materials e.V, RWTH Aachen University, Forckenbeckstrasse 50, 52074, Aachen, Germany
| | - Andrea Bonnin Marquez
- DWI Leibniz Institute for Interactive Materials e.V, RWTH Aachen University, Forckenbeckstrasse 50, 52074, Aachen, Germany
| | - Martin Möller
- DWI Leibniz Institute for Interactive Materials e.V, RWTH Aachen University, Forckenbeckstrasse 50, 52074, Aachen, Germany
| | - Ilia Platzman
- Max-Planck-Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
- Institute for Molecular Systems Engineering and Advanced Materials (IMSEAM), Heidelberg University, Im Neuenheimer Feld 225, 69120, Heidelberg, Germany
| | - Joachim Spatz
- Max-Planck-Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
- Institute for Molecular Systems Engineering and Advanced Materials (IMSEAM), Heidelberg University, Im Neuenheimer Feld 225, 69120, Heidelberg, Germany
- Max Planck School Matter to Life, Jahnstrasse 29, 69120, Heidelberg, Germany
| | - Smriti Singh
- Max-Planck-Institute for Medical Research, Jahnstrasse 29, 69120, Heidelberg, Germany
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Biondo NE, Argenta DF, Caon T. A Comparative Analysis of Biological and Synthetic Skin Models for Drug Transport Studies. Pharm Res 2023; 40:1209-1221. [PMID: 36959412 DOI: 10.1007/s11095-023-03499-9] [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: 02/14/2023] [Accepted: 03/04/2023] [Indexed: 03/25/2023]
Abstract
Ethical restrictions as well as practical or economic issues related to use of animal and human skin has been the main reason the growth in the number of investigations with alternative models. Reconstructed skin models, for example, have been useful to evaluate the in vitro toxicity of compounds; however, these models usually overestimate the amount of drug permeated due to impaired barrier properties. In this review, the performance of synthetic and biological skin models in transport studies was compared by considering two compounds with different physicochemical properties. The advantages and limitations of each skin model are discussed in detail. Although synthetic and reconstructed skin models have shown to be useful in the formulation optimization step, they present many limitations: (1) impaired barrier properties; (2) lack of follicular transport; (3) no metabolism in synthetic membranes; (4) differences in terms of lipid organization; (5) more affected by formulation constituents. Therefore, animal and human tissues should still be prioritized in drug transport studies until new advances in alternative models are achieved. Investigations of the impact of cell-culture conditions on skin formation, in turn, bring perspectives related to the development of unhealthy/injured skin models (an aspect that still deserves attention).
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Affiliation(s)
- Nicole Esposto Biondo
- Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, S/N - Trindade, Florianópolis, SC, 88040-900, Brazil
| | - Débora Fretes Argenta
- Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, S/N - Trindade, Florianópolis, SC, 88040-900, Brazil
| | - Thiago Caon
- Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, S/N - Trindade, Florianópolis, SC, 88040-900, Brazil.
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Bosma AL, Ouwerkerk W, Heidema MJ, Prieto-Merino D, Ardern-Jones MR, Beattie P, Brown SJ, Ingram JR, Irvine AD, Ogg G, Patel P, Reynolds NJ, Hearn RR, Wan M, Warren RB, Woolf RT, Hyseni AM, Gerbens LA, Spuls PI, Flohr C, Middelkamp-Hup MA. Comparison of real-world treatment outcomes of systemic immunomodulating therapy in atopic dermatitis patients with dark and light skin types. JAAD Int 2023; 10:14-24. [PMID: 36387062 PMCID: PMC9661502 DOI: 10.1016/j.jdin.2022.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/18/2022] [Indexed: 11/06/2022] Open
Abstract
Background Few data exist on differences in treatment effectiveness and safety in atopic dermatitis patients of different skin types. Objective To investigate treatment outcomes of dupilumab, methotrexate, and ciclosporin, and morphological phenotypes in atopic dermatitis patients, stratified by Fitzpatrick skin type. Methods In an observational prospective cohort study, pooling data from the Dutch TREAT (TREatment of ATopic eczema) NL (treatregister.nl) and UK-Irish A-STAR (Atopic eczema Systemic TherApy Register; astar-register.org) registries, data on morphological phenotypes and treatment outcomes were investigated. Results A total of 235 patients were included (light skin types [LST]: Fitzpatrick skin type 1-3, n = 156 [Ethnicity, White: 94.2%]; dark skin types [DST]: skin type 4-6, n = 68 [Black African/Afro-Caribbean: 25%, South-Asian: 26.5%, and Hispanics: 0%]). DST were younger (19.5 vs 29.0 years; P < .001), more often had follicular eczema (22.1% vs 2.6%; P < .001), higher baseline Eczema Area and Severity Index (EASI) scores (20.1 vs 14.9; P = .009), less allergic contact dermatitis (30.9% vs 47.4%; P = .03), and less previous phototherapy use (39.7% vs 59.0%; P = .008). When comparing DST and LST corrected for covariates including baseline EASI, DST showed greater mean EASI reduction between baseline and 6 months with only dupilumab (16.7 vs 9.7; adjusted P = .032). No differences were found for adverse events for any treatments (P > .05). Limitations Unblinded, non-randomized. Conclusion Atopic dermatitis differs in several characteristics between LST and DST. Skin type may influence treatment effectiveness of dupilumab.
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Key Words
- AD, atopic dermatitis
- AE, adverse event
- DLQI, Dermatology Life Quality Index
- DST, Dark Skin Type(s)
- EASI, Eczema Area and Severity Index
- IQR, interquartile range
- LST, Light Skin Type(s)
- NRS, Numerical Rating Scale
- POEM, Patient-Oriented Eczema Measure
- SD, Standard Deviation
- atopic dermatitis
- atopic eczema
- ciclosporin
- daily practice
- dupilumab
- effectiveness
- ethnicity
- methotrexate
- morphology
- race
- registry
- routine clinical care
- safety
- skin type
- systemic treatment
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Affiliation(s)
- Angela L. Bosma
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
| | - Wouter Ouwerkerk
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
- NHRIS, National Heart Centre Singapore, Singapore
| | - Madeline J. Heidema
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
| | - David Prieto-Merino
- Faculty of Medicine, Universidad de Alcalá, Madrid, Spain
- Unit for Population-Based Dermatology Research, St John's Institute of Dermatology, Guy's & St Thomas' NHS Foundation Trust and King’s College London, London, UK
| | - Michael R. Ardern-Jones
- Clinical Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, UK
- Department of Dermatology, University Hospitals NHS Foundation Trust, Southampton, UK
| | - Paula Beattie
- Department of Dermatology, Royal Hospital for Children NHS Trust, Glasgow, UK
| | - Sara J. Brown
- Centre for Genomic and Experimental Medicine, University of Edinburgh, Edinburgh, UK
| | - John R. Ingram
- Department of Dermatology, Division of Infection & Immunity, Cardiff University, Cardiff, UK
| | - Alan D. Irvine
- Department of Clinical Medicine, Trinity College Dublin, Dublin, Ireland
| | - Graham Ogg
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Prakash Patel
- Unit for Population-Based Dermatology Research, St John's Institute of Dermatology, Guy's & St Thomas' NHS Foundation Trust and King’s College London, London, UK
| | - Nick J. Reynolds
- Department of Dermatology, Institute of Cellular Medicine, Medical School, Newcastle University, Royal Victoria Infirmary and NIHR Newcastle Biomedical Research Centre Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - R.M. Ross Hearn
- Department of Dermatology & Photobiology, Ninewells Hospital and Medical School, Dundee, UK
| | - Mandy Wan
- Pharmacy Department, Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College London, London, UK
| | - Richard B. Warren
- Dermatology Centre, Salford Royal NHS Foundation Trust, NIHR Manchester Biomedical 17 Research Centre, University of Manchester, Manchester, UK
| | - Richard T. Woolf
- St John’s Institute of Dermatology, Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - Ariënna M. Hyseni
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
| | - Louise A.A. Gerbens
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
| | - Phyllis I. Spuls
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
| | - Carsten Flohr
- Unit for Population-Based Dermatology Research, St John's Institute of Dermatology, Guy's & St Thomas' NHS Foundation Trust and King’s College London, London, UK
| | - Maritza A. Middelkamp-Hup
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
| | - TREAT NL registry and UK-Irish A-STAR Study Groups
- Department of Dermatology, Amsterdam UMC, Location Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam Institute for Infection and Immunity, Amsterdam, the Netherlands
- NHRIS, National Heart Centre Singapore, Singapore
- Faculty of Medicine, Universidad de Alcalá, Madrid, Spain
- Unit for Population-Based Dermatology Research, St John's Institute of Dermatology, Guy's & St Thomas' NHS Foundation Trust and King’s College London, London, UK
- Clinical Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, UK
- Department of Dermatology, University Hospitals NHS Foundation Trust, Southampton, UK
- Department of Dermatology, Royal Hospital for Children NHS Trust, Glasgow, UK
- Centre for Genomic and Experimental Medicine, University of Edinburgh, Edinburgh, UK
- Department of Dermatology, Division of Infection & Immunity, Cardiff University, Cardiff, UK
- Department of Clinical Medicine, Trinity College Dublin, Dublin, Ireland
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Department of Dermatology, Institute of Cellular Medicine, Medical School, Newcastle University, Royal Victoria Infirmary and NIHR Newcastle Biomedical Research Centre Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
- Department of Dermatology & Photobiology, Ninewells Hospital and Medical School, Dundee, UK
- Pharmacy Department, Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College London, London, UK
- Dermatology Centre, Salford Royal NHS Foundation Trust, NIHR Manchester Biomedical 17 Research Centre, University of Manchester, Manchester, UK
- St John’s Institute of Dermatology, Guy’s and St Thomas’ NHS Foundation Trust, London, UK
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von Stebut E, Helbig D. [Anatomical and functional differences of the skin in various ethnic groups]. DERMATOLOGIE (HEIDELBERG, GERMANY) 2023; 74:80-83. [PMID: 36607359 DOI: 10.1007/s00105-022-05100-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/06/2022] [Indexed: 01/07/2023]
Abstract
Besides the differences in skin and hair color among different ethnic groups, morphological and functional differences in skin and hair have also been demonstrated. The color of skin and hair is determined by two types of melanin, eumelanin (brown to black pigment) and phaeomelanin (red to yellow pigment). In addition to the individual mixture of these pigment types, there are also differences in the melanosome arrangement of Caucasian, Asian, and African skin. Although the epidermis thickness is the same in all people, darker skin has a higher number of stratum corneum layers and a thicker dermis with a higher number of fibroblasts. The hairs of different ethnic groups also vary regarding shape and thickness: they are round in Asians, elliptical in Blacks and intermediate in Whites. Hair diameter is the greatest in Asians, followed by Blacks and is the smallest in Whites, whereas the number of hairs is highest in Whites, followed by that in Asians and Blacks.
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Affiliation(s)
- Esther von Stebut
- Klinik und Poliklinik für Dermatologie und Venerologie, Uniklinikum Köln, Medizinische Fakultät der Universität zu Köln, Kerpener Str. 62, 50937, Köln, Deutschland.
| | - Doris Helbig
- Klinik und Poliklinik für Dermatologie und Venerologie, Uniklinikum Köln, Medizinische Fakultät der Universität zu Köln, Kerpener Str. 62, 50937, Köln, Deutschland
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Brown-Korsah JB, McKenzie S, Omar D, Syder NC, Elbuluk N, Taylor SC. Variations in genetics, biology, and phenotype of cutaneous disorders in skin of color - Part I: Genetic, biologic, and structural differences in skin of color. J Am Acad Dermatol 2022; 87:1239-1258. [PMID: 35809800 DOI: 10.1016/j.jaad.2022.06.1193] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 05/27/2022] [Accepted: 06/13/2022] [Indexed: 11/18/2022]
Abstract
Skin of color (SOC) populations include those who identify as Black/African, Hispanic/Latinx, Asian/Pacific Islander, American Indian/Native Alaskan, Indigenous Australian, Middle Eastern, biracial/multiracial, or non-White; this list is far from exhaustive and may vary between and within cultures. Recent genetic and immunological studies have suggested that cutaneous inflammatory disorders (atopic dermatitis, psoriasis, and hidradenitis suppurativa) and malignancies (melanoma, basal cell carcinoma, and cutaneous T-cell lymphoma) may have variations in their immunophenotype among SOC. Additionally, there is growing recognition of the substantial role social determinants of health play in driving health inequalities in SOC communities. It is critically important to understand that social determinants of health often play a larger role than biologic or genetic factors attributed to "race" in health care outcomes. Herein, we describe the structural, genetic, and immunological variations and the potential implications of these variations in populations with SOC. This article underscores the importance of increasing the number of large, robust genetic studies of cutaneous disorders in SOC to create more targeted, effective therapies for this often underserved and understudied population. Part II of this CME will highlight the clinical differences in the phenotypic presentation of and the health disparities associated with the aforementioned cutaneous disorders in SOC.
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Affiliation(s)
- Jessica B Brown-Korsah
- Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania; Case Western Reserve University, School of Medicine, Cleveland, Ohio
| | - Shanice McKenzie
- Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Deega Omar
- Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania; George Washington University, School of Medicine and Health Sciences, Washington, District of Columbia
| | - Nicole C Syder
- Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Nada Elbuluk
- Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Susan C Taylor
- Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
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Markiewicz E, Karaman-Jurukovska N, Mammone T, Idowu OC. Post-Inflammatory Hyperpigmentation in Dark Skin: Molecular Mechanism and Skincare Implications. Clin Cosmet Investig Dermatol 2022; 15:2555-2565. [PMID: 36466945 PMCID: PMC9709857 DOI: 10.2147/ccid.s385162] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/30/2022] [Indexed: 09/23/2023]
Abstract
Human skin is characterized by significant diversity in color and tone, which are determined by the quantity and distribution of melanin pigment in the epidermis. Melanin absorbs and reflects ultraviolet radiation (UVR), preventing the damage to genomic DNA in the epidermis and degradation of collagen in the dermis; therefore, darker skin types are thought to be well protected from the photodamage because of the high melanin content. However, increased content of melanin in combination with the extrinsic stress factors causing inflammation such as excess UVR, allergic reactions, or injury can also frequently lead to cosmetic problems resulting in discoloration and scarring. This review summarizes current knowledge on histopathology and likely molecular signatures of one of the most common problems, post-inflammatory hyperpigmentation (PIH). The mechanisms proposed so far are subsequently discussed in the context of other factors characterizing darker skin types. This includes the common cellular features, organization of upper skin layers, and major biomarkers, with particular emphasis on increased propensities to systemic and localized inflammation. Enhanced or prolonged inflammatory responses can not only affect the process of melanogenesis but also have been implicated in injury-related skin pathologies and aging. Finally, we summarize the major cosmetic treatments for PIH and their known anti-inflammatory targets, which can be beneficial for darker skin tones and combined with broad-spectrum filters against UVR.
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Affiliation(s)
- Ewa Markiewicz
- Hexis Lab, The Catalyst, Newcastle Helix, Newcastle upon Tyne, UK
| | | | | | - Olusola C Idowu
- Hexis Lab, The Catalyst, Newcastle Helix, Newcastle upon Tyne, UK
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9
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Muacevic A, Adler JR. Classic and Current Opinions in Human Organ and Tissue Transplantation. Cureus 2022; 14:e30982. [PMID: 36337306 PMCID: PMC9624478 DOI: 10.7759/cureus.30982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/01/2022] [Indexed: 11/30/2022] Open
Abstract
Graft tolerance is a pathophysiological condition heavily reliant on the dynamic interaction of the innate and adaptive immune systems. Genetic polymorphism determines immune responses to tissue/organ transplantation, and intricate humoral and cell-mediated mechanisms control these responses. In transplantation, the clinician's goal is to achieve a delicate equilibrium between the allogeneic immune response, undesired effects of the immunosuppressive drugs, and the existing morbidities that are potentially life-threatening. Transplant immunopathology involves sensitization, effector, and apoptosis phases which recruit and engages immunological cells like natural killer cells, lymphocytes, neutrophils, and monocytes. Similarly, these cells are involved in the transfer of normal or genetically engineered T cells. Advances in tissue transplantation would involve a profound knowledge of the molecular mechanisms that underpin the respective immunopathology involved and the design of precision medicines that are safe and effective.
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10
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Markiewicz E, Idowu OC. Evaluation of Personalized Skincare Through in-silico Gene Interactive Networks and Cellular Responses to UVR and Oxidative Stress. Clin Cosmet Investig Dermatol 2022; 15:2221-2243. [PMID: 36284733 PMCID: PMC9588296 DOI: 10.2147/ccid.s383790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 10/13/2022] [Indexed: 11/07/2022]
Abstract
Purpose Personalized approaches in dermatology are designed to match the specific requirements based on the individual genetic makeup. One major factor accounting for the differences in skin phenotypes is single nucleotide polymorphism (SNP) within several genes with diverse roles that extend beyond skin tone and pigmentation. Therefore, the cellular sensitivities to the environmental stress and damage linked to extrinsic aging could also underlie the individual characteristics of the skin and dictate the unique skin care requirements. This study aimed to identify the likely biomarkers and molecular signatures expressed in skin cells of different ethnic backgrounds, which could aid further the design of personalized skin products based on specific demands. Methods Using data mining and in-silico modeling, the association of SNP-affected genes with three major skin types of European, Asian and African origin was analyzed and compared within the structure-function gene interaction networks. Cultured dermal fibroblasts were subsequently subjected to ultraviolet radiation and oxidative stress and analyzed for DNA damage and senescent markers. The protective applications of two cosmetic ingredients, Resveratrol and Quercetin, were validated in both cellular and in-silico models. Results Each skin type was characterized by the presence of SNPs in the genes controlling facultative and constitutive pigmentation, which could also underlie the major differences in responses to photodamage, such as oxidative stress, inflammation, and barrier homeostasis. Skin-type-specific dermal fibroblasts cultured in-vitro demonstrated distinctive sensitivities to ultraviolet radiation and oxidative stress, which could be modulated further by the bioactive compounds with the predicted capacities to interact with some of the genes in the in-silico models. Conclusion Evaluation of the SNP-affected gene networks and likely sensitivities of skin cells, defined as low threshold levels to extrinsic stress factors, can provide a valuable tool for the design and formulation of personalized skin products that match more accurately diverse ethnic backgrounds.
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Affiliation(s)
- Ewa Markiewicz
- Hexis Lab, The Catalyst, Newcastle Helix, Newcastle upon Tyne, UK
| | - Olusola C Idowu
- Hexis Lab, The Catalyst, Newcastle Helix, Newcastle upon Tyne, UK,Correspondence: Olusola C Idowu, HexisLab Limited, The Catalyst, Newcastle Helix, Newcastle upon Tyne, NE4 5TG, UK, Tel +44 1394 825487, Email
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Klopot A, Baida G, Kel A, Tsoi LC, Perez White BE, Budunova I. Transcriptome analysis reveals intrinsic pro-inflammatory signaling in healthy African American skin. J Invest Dermatol 2021; 142:1360-1371.e15. [PMID: 34757068 PMCID: PMC9038646 DOI: 10.1016/j.jid.2021.09.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 09/28/2021] [Accepted: 09/29/2021] [Indexed: 12/23/2022]
Abstract
Differences in morphology and physiology of darkly pigmented compared to lightly pigmented skin are well recognized. There are also disparities in prevalence and clinical features for many inflammatory skin diseases including atopic dermatitis and psoriasis; however, the underlying mechanisms are largely unknown. We compared the baseline gene expression in full thickness skin biopsies from healthy individuals self-reporting as African American (AA) or White Non-Hispanic (WNH). Extensively validated RNA-Seq analysis identified 570 differentially expressed genes (DEG) in AA skin including immunoglobulins and their receptors such as FCER1G; pro-inflammatory genes such as TNFα, IL-32; EDC (epidermal differentiation cluster) and keratin genes. DEGs were functionally enriched for inflammatory responses, keratinization, cornified envelope formation. RNA-seq analysis of 3D human skin equivalents (HSE) made from AA and WNH primary keratinocytes revealed 360 DEGs (some shared with skin) which were enriched by similar functions. AA HSE appeared more responsive to TNFα pro-inflammatory effects. Finally, AA-specific DEGs in skin and HSE significantly overlapped with molecular signatures of skin in AD and psoriasis patients. Overall, these findings suggest the existence of intrinsic pro-inflammatory circuits in AA keratinocytes/skin that may account for disease disparities and will help to build a foundation for the development of targeted skin disease prevention.
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Affiliation(s)
- Anna Klopot
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Gleb Baida
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Alexander Kel
- geneXplain GmbH, Wolfenbüttel, Germany; Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Lam C Tsoi
- Department of Dermatology, University of Michigan Medical School, Ann Arbor, Michigan, USA; Department of Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, Michigan, USA; Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA
| | - Bethany E Perez White
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Irina Budunova
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.
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12
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Addressing Human Skin Ethnicity: Contribution of Tissue Engineering to the Development of Cosmetic Ingredients. COSMETICS 2021. [DOI: 10.3390/cosmetics8040098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Recent publications describe various skin disorders in relation to phototypes and aging. The highest phototypes (III to VI) are more sensitive to acne, with the appearance of dark spots due to the inflammation induced by Cutibacterium acnes (previously Propionibacterium acnes). Dryness with aging is due to a lower activity of specific enzymes involved in the maturation of lipids in the stratum corneum. To observe and understand these cutaneous issues, tissue engineering is a perfect tool. Since several years, pigmented epidermis with melanocytes derived from specific phototypes allow to develop in vitro models for biological investigations. In the present study, several models were developed to study various skin disorders associated with phototypes and aging. These models were also used to evaluate selected ingredients’ ability to decrease the negative effects of acne, inflammation, and cutaneous dryness. Hyperpigmentation was observed on our reconstructed pigmented epidermis after the application of C. acnes, and pollutant (PM10) application induced increased inflammatory cytokine release. Tissue engineering and molecular biology offer the capability to modify genetically cells to decrease the expression of targeted proteins. In our case, GCase was silenced to decrease the maturation of lipids and in turn modify the epidermal barrier function. These in vitro models assisted in the development of ethnic skin-focused cosmetic ingredients.
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13
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Alderden J, Cadavero A, Dougherty D, Jung SH, Yap T. Subsequent Pressure Injury Development in Mechanically Ventilated Critical Care Patients with Hospital-Acquired Pressure Injury: A Retrospective Cohort Study. Adv Skin Wound Care 2021; 34:412-416. [PMID: 34081637 PMCID: PMC8716002 DOI: 10.1097/01.asw.0000752700.00049.b5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To identify factors associated with subsequent hospital-acquired pressure injury (HAPrI) formation among patients in surgical and cardiovascular surgical ICUs with an initial HAPrI. METHODS Patients admitted to a level 1 trauma center and academic medical center in the Western US between 2014 and 2018 were eligible for this retrospective cohort study. Inclusion criteria were development of an HAPrI stage 2 or above, age older than 18 years, the use of mechanical ventilation for at least 24 hours, and documentation of a risk-based HAPrI-prevention plan including repositioning at least every 2 hours. The primary outcome measure was development of a second, subsequent HAPrI stage 2 or higher. Potential predictor variables included demographic factors, shock, Charleston comorbidity score, blood gas and laboratory values, surgical factors, vasopressor infusions, levels of sedation or agitation, Braden Scale scores, and nursing skin assessment data. RESULTS The final sample consisted of 226 patients. Among those, 77 (34%) developed a second HAPrI. Independent risk factors for subsequent HAPrI formation were decreased hemoglobin (odds ratio, 0.71; 95% confidence interval [CI], 0.53-0.92; P < .000), vasopressin infusion (odds ratio, 2.20; 95% CI, 1.17-4.26; P = .02), and longer length of stay in the ICU (odds ratio, 1.01; 95% CI, 1.00-1.02; P = .009). CONCLUSIONS Patients with an HAPrI are at high risk of subsequent HAPrI development. Anemia, vasopressin infusion, and longer ICU stays are independent risk factors for repeat HAPrI formation.
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Affiliation(s)
- Jenny Alderden
- University of Utah college of Nursing, Salt Lake City, UT
| | | | | | - Se-Hee Jung
- University of Utah college of Nursing, Salt Lake City, UT
| | - Tracey Yap
- Duke University School of Nursing, Durham, NC
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14
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Leite MN, Viegas JSR, Praça FSG, de Paula NA, Ramalho LNZ, Bentley MVLB, Frade MAC. Ex vivo model of human skin (hOSEC) for assessing the dermatokinetics of the anti-melanoma drug Dacarbazine. Eur J Pharm Sci 2021; 160:105769. [PMID: 33610737 DOI: 10.1016/j.ejps.2021.105769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 02/05/2021] [Accepted: 02/15/2021] [Indexed: 12/20/2022]
Abstract
Alternative models to replace animals in experimental studies remain a challenge in testing the effectiveness of dermatologic and cosmetic drugs. We proposed a model of human organotypic skin explant culture (hOSEC) to assess the profile of cutaneous drug skin distribution, adopting dacarbazine as a model, and respective new methodologies for dermatokinetic analysis. The viability tests were evaluated in primary keratinocytes and fibroblasts, and skin by MTT and TTC assays, respectively. Then, dacarbazine was applied to the culture medium, and the hOSEC method was applied to verify the dynamics of skin distribution of dacarbazine and determine its dermatokinetic profile. The results of cell and tissue viability showed that both were considered viable. The dermatokinetic results indicated that dacarbazine can be absorbed through the skin, reaching a concentration of 36.36 µg/mL (18,18%) of the initial dose (200 µg/mL) after 12 h in culture. Histological data showed that the skin maintained its structure throughout the tested time that the hOSEC method was applied. No apoptotic cells were observed in the epidermal and dermal layers. No visible changes in the dermo-epidermal junction and no inflammatory processes with the recruitment of defense cells were observed. Hence, these findings suggest that the hOSEC concept as an alternative ex vivo model for assessing the dynamics of skin distribution of drugs, such as dacarbazine, and determining their respective dermatokinetic profiles.
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Affiliation(s)
- Marcel Nani Leite
- Division of Dermatology - Wound Healing & Hansen's Disease Lab, Department of Internal Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
| | - Juliana Santos Rosa Viegas
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
| | - Fabíola Silva Garcia Praça
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
| | - Natália Aparecida de Paula
- Division of Dermatology - Wound Healing & Hansen's Disease Lab, Department of Internal Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
| | - Leandra Náira Zambelli Ramalho
- Department of Pathology and Legal Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
| | | | - Marco Andrey Cipriani Frade
- Division of Dermatology - Wound Healing & Hansen's Disease Lab, Department of Internal Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
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15
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Loomis KH, Wu SK, Ernlund A, Zudock K, Reno A, Blount K, Karig DK. A mixed community of skin microbiome representatives influences cutaneous processes more than individual members. MICROBIOME 2021; 9:22. [PMID: 33482907 PMCID: PMC7825201 DOI: 10.1186/s40168-020-00963-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 12/06/2020] [Indexed: 05/06/2023]
Abstract
BACKGROUND Skin, the largest organ of the human body by weight, hosts a diversity of microorganisms that can influence health. The microbial residents of the skin are now appreciated for their roles in host immune interactions, wound healing, colonization resistance, and various skin disorders. Still, much remains to be discovered in terms of the host pathways influenced by skin microorganisms, as well as the higher-level skin properties impacted through these microbe-host interactions. Towards this direction, recent efforts using mouse models point to pronounced changes in the transcriptional profiles of the skin in response to the presence of a microbial community. However, there is a need to quantify the roles of microorganisms at both the individual and community-level in healthy human skin. In this study, we utilize human skin equivalents to study the effects of individual taxa and a microbial community in a precisely controlled context. Through transcriptomics analysis, we identify key genes and pathways influenced by skin microbes, and we also characterize higher-level impacts on skin processes and properties through histological analyses. RESULTS The presence of a microbiome on a 3D skin tissue model led to significantly altered patterns of gene expression, influencing genes involved in the regulation of apoptosis, proliferation, and the extracellular matrix (among others). Moreover, microbiome treatment influenced the thickness of the epidermal layer, reduced the number of actively proliferating cells, and increased filaggrin expression. Many of these findings were evident upon treatment with the mixed community, but either not detected or less pronounced in treatments by single microorganisms, underscoring the impact that a diverse skin microbiome has on the host. CONCLUSIONS This work contributes to the understanding of how microbiome constituents individually and collectively influence human skin processes and properties. The results show that, while it is important to understand the effect of individual microbes on the host, a full community of microbes has unique and pronounced effects on the skin. Thus, in its impacts on the host, the skin microbiome is more than the sum of its parts. Video abstract.
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Affiliation(s)
- Kristin H. Loomis
- Research and Exploratory Development, Johns Hopkins University Applied Physics Laboratory, Laurel, MD USA
| | - Susan K. Wu
- Research and Exploratory Development, Johns Hopkins University Applied Physics Laboratory, Laurel, MD USA
| | - Amanda Ernlund
- Research and Exploratory Development, Johns Hopkins University Applied Physics Laboratory, Laurel, MD USA
| | - Kristina Zudock
- Research and Exploratory Development, Johns Hopkins University Applied Physics Laboratory, Laurel, MD USA
| | - Allison Reno
- Department of Bioengineering, Clemson University, Clemson, SC USA
| | - Kianna Blount
- Research and Exploratory Development, Johns Hopkins University Applied Physics Laboratory, Laurel, MD USA
| | - David K. Karig
- Research and Exploratory Development, Johns Hopkins University Applied Physics Laboratory, Laurel, MD USA
- Department of Bioengineering, Clemson University, Clemson, SC USA
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16
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Alderden J, Cowan LJ, Dimas JB, Chen D, Zhang Y, Cummins M, Yap TL. Risk Factors for Hospital-Acquired Pressure Injury in Surgical Critical Care Patients. Am J Crit Care 2020; 29:e128-e134. [PMID: 33130863 DOI: 10.4037/ajcc2020810] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Hospital-acquired pressure injuries disproportionately affect critical care patients. Although risk factors such as moisture, illness severity, and inadequate perfusion have been recognized, nursing skin assessment data remain unexamined in relation to the risk for hospital-acquired pressure injuries. OBJECTIVE To identify factors associated with hospital-acquired pressure injuries among surgical critical care patients. The specific aim was to analyze data obtained from routine nursing skin assessments alongside other potential risk factors identified in the literature. METHODS This retrospective cohort study included 5101 surgical critical care patients at a level I trauma center and academic medical center. Multivariate logistic regression using the least absolute shrinkage and selection operator method identified important predictors with parsimonious representation. Use of specialty pressure redistribution beds was included in the model as a known predictive factor because specialty beds are a common preventive intervention. RESULTS Independent risk factors identified by logistic regression were skin irritation (rash or diffuse, nonlocalized redness) (odds ratio, 1.788; 95% CI, 1.404-2.274; P < .001), minimum Braden Scale score (odds ratio, 0.858; 95% CI, 0.818-0.899; P < .001), and duration of intensive care unit stay before the hospital-acquired pressure injury developed (odds ratio, 1.003; 95% CI, 1.003-1.004; P < .001). CONCLUSIONS The strongest predictor was irritated skin, a potentially modifiable risk factor. Irritated skin should be treated and closely monitored, and the cause should be eliminated to allow the skin to heal.
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Affiliation(s)
- Jenny Alderden
- Jenny Alderden is an assistant professor and Mollie Cummins is a professor, University of Utah College of Nursing, Salt Lake City
| | - Linda J. Cowan
- Linda J. Cowan is associate director, VISN 8 Patient Safety Center of Inquiry, James A. Haley Veterans’ Hospital and Clinics, Tampa, Florida
| | - Jonathan B. Dimas
- Jonathan B. Dimas is a PhD candidate, University of Utah College of Nursing, and a clinical nurse and analyst, University of Utah Health, Salt Lake City
| | - Danli Chen
- Danli Chen is a biostatistician II and Yue Zhang is an associate professor, Division of Epidemiology, University of Utah, Salt Lake City
| | - Yue Zhang
- Danli Chen is a biostatistician II and Yue Zhang is an associate professor, Division of Epidemiology, University of Utah, Salt Lake City
| | - Mollie Cummins
- Jenny Alderden is an assistant professor and Mollie Cummins is a professor, University of Utah College of Nursing, Salt Lake City
| | - Tracey L. Yap
- Tracey L. Yap is an associate professor, Duke University School of Nursing, Durham, North Carolina
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17
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Sanabria-de la Torre R, Fernández-González A, Quiñones-Vico MI, Montero-Vilchez T, Arias-Santiago S. Bioengineered Skin Intended as In Vitro Model for Pharmacosmetics, Skin Disease Study and Environmental Skin Impact Analysis. Biomedicines 2020; 8:E464. [PMID: 33142704 PMCID: PMC7694072 DOI: 10.3390/biomedicines8110464] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 10/28/2020] [Accepted: 10/29/2020] [Indexed: 02/08/2023] Open
Abstract
This review aims to be an update of Bioengineered Artificial Skin Substitutes (BASS) applications. At the first moment, they were created as an attempt to replace native skin grafts transplantation. Nowadays, these in vitro models have been increasing and widening their application areas, becoming important tools for research. This study is focus on the ability to design in vitro BASS which have been demonstrated to be appropriate to develop new products in the cosmetic and pharmacology industry. Allowing to go deeper into the skin disease research, and to analyze the effects provoked by environmental stressful agents. The importance of BASS to replace animal experimentation is also highlighted. Furthermore, the BASS validation parameters approved by the OECD (Organisation for Economic Co-operation and Development) are also analyzed. This report presents an overview of the skin models applicable to skin research along with their design methods. Finally, the potential and limitations of the currently available BASS to supply the demands for disease modeling and pharmaceutical screening are discussed.
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Affiliation(s)
- Raquel Sanabria-de la Torre
- Cell Production and Tissue Engineering Unit, Virgen de las Nieves University Hospital, 18014 Granada, Spain; (R.S.-d.l.T.); (M.I.Q.-V.); (S.A.-S.)
- Biosanitary Institute of Granada (ibs.GRANADA), 18014 Granada, Spain;
- Andalusian Network of Design and Translation of Advanced Therapies, 41092 Sevilla, Spain
| | - Ana Fernández-González
- Cell Production and Tissue Engineering Unit, Virgen de las Nieves University Hospital, 18014 Granada, Spain; (R.S.-d.l.T.); (M.I.Q.-V.); (S.A.-S.)
- Biosanitary Institute of Granada (ibs.GRANADA), 18014 Granada, Spain;
- Andalusian Network of Design and Translation of Advanced Therapies, 41092 Sevilla, Spain
| | - María I. Quiñones-Vico
- Cell Production and Tissue Engineering Unit, Virgen de las Nieves University Hospital, 18014 Granada, Spain; (R.S.-d.l.T.); (M.I.Q.-V.); (S.A.-S.)
- Biosanitary Institute of Granada (ibs.GRANADA), 18014 Granada, Spain;
- Andalusian Network of Design and Translation of Advanced Therapies, 41092 Sevilla, Spain
| | - Trinidad Montero-Vilchez
- Biosanitary Institute of Granada (ibs.GRANADA), 18014 Granada, Spain;
- Dermatology Department, Virgen de las Nieves University Hospital, 18014 Granada, Spain
| | - Salvador Arias-Santiago
- Cell Production and Tissue Engineering Unit, Virgen de las Nieves University Hospital, 18014 Granada, Spain; (R.S.-d.l.T.); (M.I.Q.-V.); (S.A.-S.)
- Biosanitary Institute of Granada (ibs.GRANADA), 18014 Granada, Spain;
- Andalusian Network of Design and Translation of Advanced Therapies, 41092 Sevilla, Spain
- Dermatology Department, Virgen de las Nieves University Hospital, 18014 Granada, Spain
- Dermatology Department, School of Medicine, Granada University, 18016 Granada, Spain
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18
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The GTEx Consortium atlas of genetic regulatory effects across human tissues. Science 2020; 369:1318-1330. [PMID: 32913098 PMCID: PMC7737656 DOI: 10.1126/science.aaz1776] [Citation(s) in RCA: 1910] [Impact Index Per Article: 477.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 07/30/2020] [Indexed: 02/06/2023]
Abstract
The Genotype-Tissue Expression (GTEx) project was established to characterize genetic effects on the transcriptome across human tissues and to link these regulatory mechanisms to trait and disease associations. Here, we present analyses of the version 8 data, examining 15,201 RNA-sequencing samples from 49 tissues of 838 postmortem donors. We comprehensively characterize genetic associations for gene expression and splicing in cis and trans, showing that regulatory associations are found for almost all genes, and describe the underlying molecular mechanisms and their contribution to allelic heterogeneity and pleiotropy of complex traits. Leveraging the large diversity of tissues, we provide insights into the tissue specificity of genetic effects and show that cell type composition is a key factor in understanding gene regulatory mechanisms in human tissues.
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19
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Walker JM, Garcet S, Aleman JO, Mason CE, Danko D, Butler D, Zuffa S, Swann JR, Krueger J, Breslow JL, Holt PR. Obesity and ethnicity alter gene expression in skin. Sci Rep 2020; 10:14079. [PMID: 32826922 PMCID: PMC7442822 DOI: 10.1038/s41598-020-70244-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Accepted: 07/15/2020] [Indexed: 11/21/2022] Open
Abstract
Obesity is accompanied by dysfunction of many organs, but effects on the skin have received little attention. We studied differences in epithelial thickness by histology and gene expression by Affymetrix gene arrays and PCR in the skin of 10 obese (BMI 35-50) and 10 normal weight (BMI 18.5-26.9) postmenopausal women paired by age and ethnicity. Epidermal thickness did not differ with obesity but the expression of genes encoding proteins associated with skin blood supply and wound healing were altered. In the obese, many gene expression pathways were broadly downregulated and subdermal fat showed pronounced inflammation. There were no changes in skin microbiota or metabolites. African American subjects differed from European Americans with a trend to increased epidermal thickening. In obese African Americans, compared to obese European Americans, we observed altered gene expression that may explain known differences in water content and stress response. African Americans showed markedly lower expression of the gene encoding the cystic fibrosis transmembrane regulator characteristic of the disease cystic fibrosis. The results from this preliminary study may explain the functional changes found in the skin of obese subjects and African Americans.
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Affiliation(s)
- Jeanne M Walker
- The Rockefeller University Hospital, New York, NY, 10065, USA.
| | - Sandra Garcet
- Laboratory of Investigational Dermatology, The Rockefeller University, New York, NY, 10065, USA
| | - Jose O Aleman
- Laboratory of Biochemical Genetics and Metabolism, The Rockefeller University, New York, NY, 10065, USA
- Laboratory of Translational Obesity Research, New York University Langone Health, New York, NY, 10016, USA
| | | | - David Danko
- Weill Cornell Medical College, New York, NY, 10065, USA
| | - Daniel Butler
- Weill Cornell Medical College, New York, NY, 10065, USA
| | - Simone Zuffa
- Department of Metabolism, Digestion, and Reproduction, Imperial College London, London, UK
| | - Jonathan R Swann
- Department of Metabolism, Digestion, and Reproduction, Imperial College London, London, UK
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, UK
| | - James Krueger
- Laboratory of Investigational Dermatology, The Rockefeller University, New York, NY, 10065, USA
| | - Jan L Breslow
- Laboratory of Biochemical Genetics and Metabolism, The Rockefeller University, New York, NY, 10065, USA
| | - Peter R Holt
- Laboratory of Biochemical Genetics and Metabolism, The Rockefeller University, New York, NY, 10065, USA.
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