151
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Chitinases and Imaginal disc growth factors organize the extracellular matrix formation at barrier tissues in insects. Sci Rep 2016; 6:18340. [PMID: 26838602 PMCID: PMC4738247 DOI: 10.1038/srep18340] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/16/2015] [Indexed: 12/27/2022] Open
Abstract
The cuticle forms an apical extracellular-matrix (ECM) that covers exposed organs, such as epidermis, trachea and gut, for organizing morphogenesis and protection of insects. Recently, we reported that cuticle proteins and chitin are involved in ECM formation. However, molecular mechanisms that control assembly, maturation and replacement of the ECM and its components are not well known. Here we investigated the poorly described glyco-18-domain hydrolase family in Drosophila and identified the Chitinases (Chts) and imaginal-disc-growth-factors (Idgfs) that are essential for larval and adult molting. We demonstrate that Cht and idgf depletion results in deformed cuticles, larval and adult molting defects, and insufficient protection against wounding and bacterial infection, which altogether leads to early lethality. We show that Cht2/Cht5/Cht7/Cht9/Cht12 and idgf1/idgf3/idgf4/idgf5/idgf6 are needed for organizing proteins and chitin-matrix at the apical cell surface. Our data indicate that normal ECM formation requires Chts, which potentially hydrolyze chitin-polymers. We further suggest that the non-enzymatic idgfs act as structural proteins to maintain the ECM scaffold against chitinolytic degradation. Conservation of Chts and Idgfs proposes analogous roles in ECM dynamics across the insect taxa, indicating that Chts/Idgfs are new targets for species specific pest control.
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152
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García IE, Bosen F, Mujica P, Pupo A, Flores-Muñoz C, Jara O, González C, Willecke K, Martínez AD. From Hyperactive Connexin26 Hemichannels to Impairments in Epidermal Calcium Gradient and Permeability Barrier in the Keratitis-Ichthyosis-Deafness Syndrome. J Invest Dermatol 2016; 136:574-583. [PMID: 26777423 DOI: 10.1016/j.jid.2015.11.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 11/05/2015] [Accepted: 11/06/2015] [Indexed: 01/19/2023]
Abstract
The keratitis-ichthyosis-deafness (KID) syndrome is characterized by corneal, skin, and hearing abnormalities. KID has been linked to heterozygous dominant missense mutations in the GJB2 and GJB6 genes, encoding connexin26 and 30, respectively. In vitro evidence indicates that KID mutations lead to hyperactive (open) hemichannels, which in some cases is accompanied by abnormal function of gap junction channels. Transgenic mouse models expressing connexin26 KID mutations reproduce human phenotypes and present impaired epidermal calcium homeostasis and abnormal lipid composition of the stratum corneum affecting the water barrier. Here we have compiled relevant data regarding the KID syndrome and propose a mechanism for the epidermal aspects of the disease.
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Affiliation(s)
- Isaac E García
- Centro Interdisciplinario de Neurociencia de Valparaíso, Instituto de Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Felicitas Bosen
- LIMES (Life and Medical Sciences) Institute, University of Bonn, Bonn, Germany
| | - Paula Mujica
- Centro Interdisciplinario de Neurociencia de Valparaíso, Instituto de Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Amaury Pupo
- Centro Interdisciplinario de Neurociencia de Valparaíso, Instituto de Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Carolina Flores-Muñoz
- Centro Interdisciplinario de Neurociencia de Valparaíso, Instituto de Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Oscar Jara
- Centro Interdisciplinario de Neurociencia de Valparaíso, Instituto de Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Carlos González
- Centro Interdisciplinario de Neurociencia de Valparaíso, Instituto de Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Klaus Willecke
- LIMES (Life and Medical Sciences) Institute, University of Bonn, Bonn, Germany.
| | - Agustín D Martínez
- Centro Interdisciplinario de Neurociencia de Valparaíso, Instituto de Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile.
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153
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Wohlrab J, Richter C, Stauder S. Preclinical and clinical characterization of the cutaneous bioavailability of the hydrophilic phase of a water-in-oil emulsion. J Dtsch Dermatol Ges 2015; 14:698-705. [PMID: 26636922 DOI: 10.1111/ddg.12732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Interactions between the stratum corneum and individual phases of an emulsion system depend on various factors, but primarily on the outer continuous phase of the system. While there is plenty of data on the lipophilic phase, only very little data exists on the actual penetration of the hydrophilic phase of water-in-oil emulsions into the stratum corneum. PATIENTS AND METHODS Against this background, two comparable water-in-oil emulsions were preclinically and clinically investigated on healthy as well as on artificially damaged skin with regard to interactions of the hydrophilic phase. In preclinical studies, following epicutaneous application on ex vivo skin, the distribution of the hydrophilic phase was quantified using fluorescence tests and analyzed according to anatomic layers. Additionally, a randomized, controlled, investigator-blinded study investigated the effects of the preparations on the barrier function of healthy and artificially damaged skin over time. RESULTS The results clearly show that water substitution using a water-in-oil emulsion can only partially be attained by the addition of hygroscopic substances (e. g. urea). These effects may primarily be explained by the occlusive properties of the lipophilic phase. CONCLUSIONS This, the use of water-in-oil emulsions may in particular be recommended for chronic barrier impairment, as long-lasting effects are not to be expected in acutely damaged skin.
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Affiliation(s)
- Johannes Wohlrab
- Department of Dermatology and Venereology, Martin-Luther -University Halle-Wittenberg, Halle (Saale), Germany.,Institute of Applied Dermatopharmacy, Martin-Luther -University -Halle-Wittenberg, Halle (Saale), Germany
| | - Claudia Richter
- Department of Dermatology, -Venereology and Allergology, Charité University Medicine Berlin, Berlin, Germany
| | - Susanne Stauder
- Department of Dermatology and Venereology, Martin-Luther -University Halle-Wittenberg, Halle (Saale), Germany
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154
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Talero E, García-Mauriño S, Ávila-Román J, Rodríguez-Luna A, Alcaide A, Motilva V. Bioactive Compounds Isolated from Microalgae in Chronic Inflammation and Cancer. Mar Drugs 2015; 13:6152-209. [PMID: 26437418 PMCID: PMC4626684 DOI: 10.3390/md13106152] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/09/2015] [Accepted: 09/15/2015] [Indexed: 12/12/2022] Open
Abstract
The risk of onset of cancer is influenced by poorly controlled chronic inflammatory processes. Inflammatory diseases related to cancer development include inflammatory bowel disease, which can lead to colon cancer, or actinic keratosis, associated with chronic exposure to ultraviolet light, which can progress to squamous cell carcinoma. Chronic inflammatory states expose these patients to a number of signals with tumorigenic effects, including nuclear factor kappa B (NF-κB) and mitogen-activated protein kinases (MAPK) activation, pro-inflammatory cytokines and prostaglandins release and ROS production. In addition, the participation of inflammasomes, autophagy and sirtuins has been demonstrated in pathological processes such as inflammation and cancer. Chemoprevention consists in the use of drugs, vitamins, or nutritional supplements to reduce the risk of developing or having a recurrence of cancer. Numerous in vitro and animal studies have established the potential colon and skin cancer chemopreventive properties of substances from marine environment, including microalgae species and their products (carotenoids, fatty acids, glycolipids, polysaccharides and proteins). This review summarizes the main mechanisms of actions of these compounds in the chemoprevention of these cancers. These actions include suppression of cell proliferation, induction of apoptosis, stimulation of antimetastatic and antiangiogenic responses and increased antioxidant and anti-inflammatory activity.
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Affiliation(s)
- Elena Talero
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Seville 41012, Spain.
| | - Sofía García-Mauriño
- Department of Plant Biology and Ecology, Faculty of Biology, University of Seville, Seville 41012, Spain.
| | - Javier Ávila-Román
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Seville 41012, Spain.
| | - Azahara Rodríguez-Luna
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Seville 41012, Spain.
| | - Antonio Alcaide
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Seville 41012, Spain.
| | - Virginia Motilva
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Seville 41012, Spain.
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155
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Lanzini J, Dargère D, Regazzetti A, Tebani A, Laprévote O, Auzeil N. Changing in lipid profile induced by the mutation of Foxn1 gene: A lipidomic analysis of Nude mice skin. Biochimie 2015; 118:234-43. [PMID: 26427556 DOI: 10.1016/j.biochi.2015.09.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 09/23/2015] [Indexed: 10/23/2022]
Abstract
Nude mice carry a spontaneous mutation affecting the gene Foxn1 mainly expressed in the epidermis. This gene is involved in several skin functions, especially in the proliferation and the differentiation of keratinocytes which are key cells of epithelial barrier. The skin, a protective barrier for the body, is essentially composed of lipids. Taking into account these factors, we conducted a lipidomic study to search for any changes in lipid composition of skin possibly related to Foxn1 mutation. Lipids were extracted from skin biopsies of Nude and BALB/c mice to be analyzed by liquid chromatography coupled to a high resolution mass spectrometer (HRMS). Multivariate and univariate data analyses were carried out to compare lipid extracts. Identification was performed using HRMS data, retention time and mass spectrometry fragmentation study. These results indicate that mutation of Foxn1 leads to significant modifications in the lipidome in Nude mice skin. An increase in cholesterol sulfate, phospholipids, sphingolipids and fatty acids associated with a decrease in glycerolipids suggest that the lipidome in mice skin is regulated by the Foxn1 gene.
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Affiliation(s)
- Justine Lanzini
- UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, 4 Avenue de L'Observatoire, 75006 Paris, France
| | - Delphine Dargère
- UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, 4 Avenue de L'Observatoire, 75006 Paris, France
| | - Anne Regazzetti
- UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, 4 Avenue de L'Observatoire, 75006 Paris, France
| | - Abdellah Tebani
- UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, 4 Avenue de L'Observatoire, 75006 Paris, France
| | - Olivier Laprévote
- UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, 4 Avenue de L'Observatoire, 75006 Paris, France; AP-HP, Service de Toxicologie Biologique, Hôpital Lariboisière, 4 Rue Ambroise Paré, 75475 Paris Cedex 10, France
| | - Nicolas Auzeil
- UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, 4 Avenue de L'Observatoire, 75006 Paris, France.
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156
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Fatty acid transport proteins in disease: New insights from invertebrate models. Prog Lipid Res 2015; 60:30-40. [PMID: 26416577 DOI: 10.1016/j.plipres.2015.08.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 08/18/2015] [Indexed: 11/22/2022]
Abstract
The dysregulation of lipid metabolism has been implicated in various diseases, including diabetes, cardiopathies, dermopathies, retinal and neurodegenerative diseases. Mouse models have provided insights into lipid metabolism. However, progress in the understanding of these pathologies is hampered by the multiplicity of essential cellular processes and genes that modulate lipid metabolism. Drosophila and Caenorhabditis elegans have emerged as simple genetic models to improve our understanding of these metabolic diseases. Recent studies have characterized fatty acid transport protein (fatp) mutants in Drosophila and C. elegans, establishing new models of cardiomyopathy, retinal degeneration, fat storage disease and dermopathies. These models have generated novel insights into the physiological role of the Fatp protein family in vivo in multicellular organisms, and are likely to contribute substantially to progress in understanding the etiology of various metabolic disorders. Here, we describe and discuss the mechanisms underlying invertebrate fatp mutant models in the light of the current knowledge relating to FATPs and lipid disorders in vertebrates.
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157
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Sun R, Celli A, Crumrine D, Hupe M, Adame LC, Pennypacker SD, Park K, Uchida Y, Feingold KR, Elias PM, Ilic D, Mauro TM. Lowered humidity produces human epidermal equivalents with enhanced barrier properties. Tissue Eng Part C Methods 2015; 21:15-22. [PMID: 24803151 DOI: 10.1089/ten.tec.2014.0065] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Multilayered human keratinocyte cultures increasingly are used to model human epidermis. Until now, studies utilizing human epidermal equivalents (HEEs) have been limited because previous preparations do not establish a normal epidermal permeability barrier. In this report, we show that reducing environmental humidity to 50% relative humidity yields HEEs that closely match human postnatal epidermis and have enhanced repair of the permeability barrier. These cultures display low transepidermal water loss and possess a calcium and pH gradient that resembles those seen in human epidermis. These cultures upregulate glucosylceramide synthase and make normal-appearing lipid lamellar bilayers. The epidermal permeability barrier of these cultures can be perturbed, using the identical tools previously described for human skin, and recover in the same time course seen during in vivo barrier recovery. These cultures will be useful for basic and applied studies on epidermal barrier function.
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Affiliation(s)
- Richard Sun
- 1 Department of Dermatology, San Francisco Veterans Administration Medical Center , San Francisco, California
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158
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Tito A, Bimonte M, Carola A, De Lucia A, Barbulova A, Tortora A, Colucci G, Apone F. An oil-soluble extract ofRubus idaeuscells enhances hydration and water homeostasis in skin cells. Int J Cosmet Sci 2015; 37:588-94. [DOI: 10.1111/ics.12236] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 04/13/2015] [Indexed: 01/24/2023]
Affiliation(s)
- A. Tito
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
| | - M. Bimonte
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
| | - A. Carola
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
| | - A. De Lucia
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
| | - A. Barbulova
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
| | - A. Tortora
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
| | - G. Colucci
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
- VitaLab srl; via B. Brin 69 Napoli Italy
| | - F. Apone
- Arterra Bioscience srl; via B. Brin 69 Napoli Italy
- VitaLab srl; via B. Brin 69 Napoli Italy
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159
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Application of single molecule fluorescence microscopy to characterize the penetration of a large amphiphilic molecule in the stratum corneum of human skin. Int J Mol Sci 2015; 16:6960-77. [PMID: 25826528 PMCID: PMC4424999 DOI: 10.3390/ijms16046960] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 03/12/2015] [Accepted: 03/13/2015] [Indexed: 11/16/2022] Open
Abstract
We report here on the application of laser-based single molecule total internal reflection fluorescence microscopy (TIRFM) to study the penetration of molecules through the skin. Penetration of topically applied drug molecules is often observed to be limited by the size of the respective drug. However, the molecular mechanisms which govern the penetration of molecules through the outermost layer of the skin are still largely unknown. As a model compound we have chosen a larger amphiphilic molecule (fluorescent dye ATTO-Oxa12) with a molecular weight >700 Da that was applied to excised human skin. ATTO-Oxa12 penetrated through the stratum corneum (SC) into the viable epidermis as revealed by TIRFM of cryosections. Single particle tracking of ATTO-Oxa12 within SC sheets obtained by tape stripping allowed us to gain information on the localization as well as the lateral diffusion dynamics of these molecules. ATTO-Oxa12 appeared to be highly confined in the SC lipid region between (intercellular space) or close to the envelope of the corneocytes. Three main distinct confinement sizes of 52 ± 6, 118 ± 4, and 205 ± 5 nm were determined. We conclude that for this amphiphilic model compound several pathways through the skin exist.
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160
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Abstract
Biotin is a water-soluble B-complex vitamin and is well-known as a co-factor for 5 indispensable carboxylases. Holocarboxylase synthetase (HLCS) catalyzes the biotinylation of carboxylases and other proteins, whereas biotinidase catalyzes the release of biotin from biotinylated peptides. Previous studies have reported that nutritional biotin deficiency and genetic defects in either HLCS or biotinidase induces cutaneous inflammation and immunological disorders. Since biotin-dependent carboxylases involve various cellular metabolic pathways including gluconeogenesis, fatty acid synthesis, and the metabolism of branched-chain amino acids and odd-chain fatty acids, metabolic abnormalities may play important roles in immunological and inflammatory disorders caused by biotin deficiency. Transcriptional factors, including NF-κB and Sp1/3, are also affected by the status of biotin, indicating that biotin regulates immunological and inflammatory functions independently of biotin-dependent carboxylases. An in-vivo analysis with a murine model revealed the therapeutic effects of biotin supplementation on metal allergies. The novel roles of biotinylated proteins and their related enzymes have recently been reported. Non-carboxylase biotinylated proteins induce chemokine production. HLCS is a nuclear protein involved in epigenetic and chromatin regulation. In this review, comprehensive knowledge on the regulation of immunological and inflammatory functions by biotin and its potential as a therapeutic agent is discussed.
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Affiliation(s)
- Toshinobu Kuroishi
- Division of Oral Immunology, Department of Oral Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.,Division of Oral Immunology, Department of Oral Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
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161
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Bellezza I, Gatticchi L, del Sordo R, Peirce MJ, Sidoni A, Roberti R, Minelli A. The loss of Tm7sf gene accelerates skin papilloma formation in mice. Sci Rep 2015; 5:9471. [PMID: 25804527 PMCID: PMC4372794 DOI: 10.1038/srep09471] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 02/16/2015] [Indexed: 01/04/2023] Open
Abstract
The 3β-hydroxysterol Δ14-reductase, encoded by the Tm7sf2 gene, is an enzyme involved in cholesterol biosynthesis. Cholesterol and its derivatives control epidermal barrier integrity and are protective against environmental insults. To determine the role of the gene in skin cholesterol homeostasis, we applied 12-o-tetradecanoylphorbol-13-acetate (TPA) to the skin of Tm7sf2+/+ and Tm7sf2-/- mice. TPA increased skin cholesterol levels by inducing de novo synthesis and up-take only in Tm7sf2+/+ mouse, confirming that the gene maintains cholesterol homeostasis under stress conditions. Cholesterol sulfate, one of the major players in skin permeability, was doubled by TPA treatment in the skin of wild-type animals but this response was lost in Tm7sf2-/- mice. The expression of markers of epidermal differentiation concomitant with farnesoid-X-receptor and p38 MAPK activation were also disrupted in Tm7sf2-/- mice. We then subjected Tm7sf2+/+ and Tm7sf2-/- mice to a classical two-stage skin carcinogenesis protocol. We found that the loss of Tm7sf2 increased incidence and multiplicity of skin papillomas. Interestingly, the null genotype showed reduced expression of nur77, a gene associated with resistance to neoplastic transformation. In conclusion, the loss of Tm7sf2 alters the expression of proteins involved in epidermal differentiation by reducing the levels of cholesterol sulfate.
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Affiliation(s)
- I Bellezza
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, p.le Gambuli, Perugia, 06132; Italia
| | - L Gatticchi
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, p.le Gambuli, Perugia, 06132; Italia
| | - R del Sordo
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, p.le Gambuli, Perugia, 06132; Italia
| | - M J Peirce
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, p.le Gambuli, Perugia, 06132; Italia
| | - A Sidoni
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, p.le Gambuli, Perugia, 06132; Italia
| | - R Roberti
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, p.le Gambuli, Perugia, 06132; Italia
| | - A Minelli
- Dipartimento di Medicina Sperimentale, Università di Perugia, Polo Unico Sant'Andrea delle Fratte, p.le Gambuli, Perugia, 06132; Italia
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162
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Feingold KR. TLR3: a receptor that recognizes cell injury is essential for permeability barrier homeostasis following UV irradiation. J Invest Dermatol 2015; 135:339-340. [PMID: 25573047 DOI: 10.1038/jid.2014.424] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The cutaneous permeability barrier is essential for life and perturbations in this barrier are repaired rapidly. After minimal injury to the stratum corneum alterations in the calcium concentration in the outer epidermis are the primary signal inducing this repair response. In this issue, studies demonstrate that Toll-like receptor 3 has an important role in signaling permeability barrier repair following injury induced by UVB irradiation.
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Affiliation(s)
- Kenneth R Feingold
- Metabolism Section, Department of Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, California, USA.
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163
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A case of recalcitrant plantar warts associated with statin use. Case Rep Dermatol Med 2015; 2015:320620. [PMID: 25789179 PMCID: PMC4348599 DOI: 10.1155/2015/320620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Accepted: 02/12/2015] [Indexed: 11/29/2022] Open
Abstract
Background. Plantar warts are a common presenting skin complaint caused by the human papillomavirus. 1st line therapies include cryotherapy and topical salicylic acid. Where there is resistance to these treatments, consideration is made for 2nd line therapies, including intralesional bleomycin, imiquimod, 5-fluorouracil, and photodynamic therapy. We present a case of bilateral persistent plantar warts, resistant to treatment with repeated cryotherapy and topical salicylic acid over a 6-year period. Following a patient initiated decision to discontinue their statin medication, we observed rapid clearance of plantar warts without change to standard therapy or their environment. This case correlates with emerging literature demonstrating a link between statin medication and proliferation of HPV through increased levels of FOXP3+ regulatory T cells.
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164
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Adams MP, Mallet DG, Pettet GJ. Towards a quantitative theory of epidermal calcium profile formation in unwounded skin. PLoS One 2015; 10:e0116751. [PMID: 25625723 PMCID: PMC4308082 DOI: 10.1371/journal.pone.0116751] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Accepted: 12/12/2014] [Indexed: 12/24/2022] Open
Abstract
We propose and mathematically examine a theory of calcium profile formation in unwounded mammalian epidermis based on: changes in keratinocyte proliferation, fluid and calcium exchange with the extracellular fluid during these cells’ passage through the epidermal sublayers, and the barrier functions of both the stratum corneum and tight junctions localised in the stratum granulosum. Using this theory, we develop a mathematical model that predicts epidermal sublayer transit times, partitioning of the epidermal calcium gradient between intracellular and extracellular domains, and the permeability of the tight junction barrier to calcium ions. Comparison of our model’s predictions of epidermal transit times with experimental data indicates that keratinocytes lose at least 87% of their volume during their disintegration to become corneocytes. Intracellular calcium is suggested as the main contributor to the epidermal calcium gradient, with its distribution actively regulated by a phenotypic switch in calcium exchange between keratinocytes and extracellular fluid present at the boundary between the stratum spinosum and the stratum granulosum. Formation of the extracellular calcium distribution, which rises in concentration through the stratum granulosum towards the skin surface, is attributed to a tight junction barrier in this sublayer possessing permeability to calcium ions that is less than 15 nm s−1 in human epidermis and less than 37 nm s−1 in murine epidermis. Future experimental work may refine the presented theory and reduce the mathematical uncertainty present in the model predictions.
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Affiliation(s)
- Matthew P. Adams
- Mathematical Sciences School and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia, and School of Chemical Engineering, The University of Queensland, Brisbane, Queensland, Australia
- * E-mail:
| | - Daniel G. Mallet
- Mathematical Sciences School and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Graeme J. Pettet
- Mathematical Sciences School and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
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165
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166
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Boncheva M. The physical chemistry of the stratum corneum lipids. Int J Cosmet Sci 2014; 36:505-15. [PMID: 25230344 DOI: 10.1111/ics.12162] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 09/11/2014] [Indexed: 12/20/2022]
Abstract
This article summarizes the current knowledge of the composition, self-assembly, and molecular organization of the stratum corneum (SC) lipids, reviews the evidence connecting these parameters and the barrier properties of human skin, and outlines the immediate issues in the field of SC lipid research.
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Affiliation(s)
- M Boncheva
- Corporate R&D Division, Firmenich SA, PO Box 239, Route des Jeunes 1, Geneva, CH-1211, Switzerland
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167
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Muenyi CS, Carrion SL, Jones LA, Kennedy LH, Slominski AT, Sutter CH, Sutter TR. Effects of in utero exposure of C57BL/6J mice to 2,3,7,8-tetrachlorodibenzo-p-dioxin on epidermal permeability barrier development and function. ENVIRONMENTAL HEALTH PERSPECTIVES 2014; 122:1052-1058. [PMID: 24904982 PMCID: PMC4181931 DOI: 10.1289/ehp.1308045] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 06/04/2014] [Indexed: 05/29/2023]
Abstract
BACKGROUND Development of the epidermal permeability barrier (EPB) is essential for neonatal life. Defects in this barrier are found in many skin diseases such as atopic dermatitis. OBJECTIVE We investigated the effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on the development and function of the EPB. METHODS Timed-pregnant C57BL/6J mice were gavaged with corn oil or TCDD (10 μg/kg body weight) on gestation day 12. Embryos were harvested on embryonic day (E) 15, E16, E17, and postnatal day (PND) 1. RESULTS A skin permeability assay showed that TCDD accelerated the development of the EPB, beginning at E15. This was accompanied by a significant decrease in transepidermal water loss (TEWL), enhanced stratification, and formation of the stratum corneum (SC). The levels of several ceramides were significantly increased at E15 and E16. PND1 histology revealed TCDD-induced acanthosis and epidermal hyperkeratosis. This was accompanied by disrupted epidermal tight junction (TJ) function, with increased dye leakage at the terminal claudin-1-staining TJs of the stratum granulosum. Because the animals did not have enhanced rates of TEWL, a commonly observed phenotype in animals with TJ defects, we performed tape-stripping. Removal of most of the SC resulted in a significant increase in TEWL in TCDD-exposed PND1 pups compared with their control group. CONCLUSIONS These findings demonstrate that in utero exposure to TCDD accelerates the formation of an abnormal EPB with leaky TJs, warranting further study of environmental exposures, epithelial TJ integrity, and atopic disease.
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168
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Dando R, Pereira E, Kurian M, Barro-Soria R, Chaudhari N, Roper SD. A permeability barrier surrounds taste buds in lingual epithelia. Am J Physiol Cell Physiol 2014; 308:C21-32. [PMID: 25209263 DOI: 10.1152/ajpcell.00157.2014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Epithelial tissues are characterized by specialized cell-cell junctions, typically localized to the apical regions of cells. These junctions are formed by interacting membrane proteins and by cytoskeletal and extracellular matrix components. Within the lingual epithelium, tight junctions join the apical tips of the gustatory sensory cells in taste buds. These junctions constitute a selective barrier that limits penetration of chemosensory stimuli into taste buds (Michlig et al. J Comp Neurol 502: 1003-1011, 2007). We tested the ability of chemical compounds to permeate into sensory end organs in the lingual epithelium. Our findings reveal a robust barrier that surrounds the entire body of taste buds, not limited to the apical tight junctions. This barrier prevents penetration of many, but not all, compounds, whether they are applied topically, injected into the parenchyma of the tongue, or circulating in the blood supply, into taste buds. Enzymatic treatments indicate that this barrier likely includes glycosaminoglycans, as it was disrupted by chondroitinase but, less effectively, by proteases. The barrier surrounding taste buds could also be disrupted by brief treatment of lingual tissue samples with DMSO. Brief exposure of lingual slices to DMSO did not affect the ability of taste buds within the slice to respond to chemical stimulation. The existence of a highly impermeable barrier surrounding taste buds and methods to break through this barrier may be relevant to basic research and to clinical treatments of taste.
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Affiliation(s)
- Robin Dando
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida; and
| | - Elizabeth Pereira
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida; and
| | - Mani Kurian
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida; and
| | - Rene Barro-Soria
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida; and
| | - Nirupa Chaudhari
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida; and Program in Neuroscience, University of Miami, Miami, Florida
| | - Stephen D Roper
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida; and Program in Neuroscience, University of Miami, Miami, Florida
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169
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Neels JG, Grimaldi PA. Physiological functions of peroxisome proliferator-activated receptor β. Physiol Rev 2014; 94:795-858. [PMID: 24987006 DOI: 10.1152/physrev.00027.2013] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The peroxisome proliferator-activated receptors, PPARα, PPARβ, and PPARγ, are a family of transcription factors activated by a diversity of molecules including fatty acids and fatty acid metabolites. PPARs regulate the transcription of a large variety of genes implicated in metabolism, inflammation, proliferation, and differentiation in different cell types. These transcriptional regulations involve both direct transactivation and interaction with other transcriptional regulatory pathways. The functions of PPARα and PPARγ have been extensively documented mainly because these isoforms are activated by molecules clinically used as hypolipidemic and antidiabetic compounds. The physiological functions of PPARβ remained for a while less investigated, but the finding that specific synthetic agonists exert beneficial actions in obese subjects uplifted the studies aimed to elucidate the roles of this PPAR isoform. Intensive work based on pharmacological and genetic approaches and on the use of both in vitro and in vivo models has considerably improved our knowledge on the physiological roles of PPARβ in various cell types. This review will summarize the accumulated evidence for the implication of PPARβ in the regulation of development, metabolism, and inflammation in several tissues, including skeletal muscle, heart, skin, and intestine. Some of these findings indicate that pharmacological activation of PPARβ could be envisioned as a therapeutic option for the correction of metabolic disorders and a variety of inflammatory conditions. However, other experimental data suggesting that activation of PPARβ could result in serious adverse effects, such as carcinogenesis and psoriasis, raise concerns about the clinical use of potent PPARβ agonists.
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Affiliation(s)
- Jaap G Neels
- Institut National de la Santé et de la Recherche Médicale U 1065, Mediterranean Center of Molecular Medicine (C3M), Team "Adaptive Responses to Immuno-metabolic Dysregulations," Nice, France; and Faculty of Medicine, University of Nice Sophia-Antipolis, Nice, France
| | - Paul A Grimaldi
- Institut National de la Santé et de la Recherche Médicale U 1065, Mediterranean Center of Molecular Medicine (C3M), Team "Adaptive Responses to Immuno-metabolic Dysregulations," Nice, France; and Faculty of Medicine, University of Nice Sophia-Antipolis, Nice, France
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170
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Krasowska A, Sigler K. How microorganisms use hydrophobicity and what does this mean for human needs? Front Cell Infect Microbiol 2014; 4:112. [PMID: 25191645 PMCID: PMC4137226 DOI: 10.3389/fcimb.2014.00112] [Citation(s) in RCA: 314] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Accepted: 07/29/2014] [Indexed: 11/25/2022] Open
Abstract
Cell surface hydrophobicity (CSH) plays a crucial role in the attachment to, or detachment from the surfaces. The influence of CSH on adhesion of microorganisms to biotic and abiotic surfaces in medicine as well as in bioremediation and fermentation industry has both negative and positive aspects. Hydrophobic microorganisms cause the damage of surfaces by biofilm formation; on the other hand, they can readily accumulate on organic pollutants and decompose them. Hydrophilic microorganisms also play a considerable role in removing organic wastes from the environment because of their high resistance to hydrophobic chemicals. Despite the many studies on the environmental and metabolic factors affecting CSH, the knowledge of this subject is still scanty and is in most cases limited to observing the impact of hydrophobicity on adhesion, aggregation or flocculation. The future of research seems to lie in finding a way to managing the microbial adhesion process, perhaps by steering cell hydrophobicity.
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Affiliation(s)
- Anna Krasowska
- Department of Biotransformation, Faculty of Biotechnology, University of Wroclaw Wroclaw, Poland
| | - Karel Sigler
- Department of Cell Biology, Institute of Microbiology, Czech Academy of Sciences Prague, Czech Republic
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171
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El-Chami C, Haslam IS, Steward MC, O'Neill CA. Role of organic osmolytes in water homoeostasis in skin. Exp Dermatol 2014; 23:534-7. [DOI: 10.1111/exd.12473] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/13/2014] [Indexed: 11/26/2022]
Affiliation(s)
- Cécile El-Chami
- Institute of Inflammation and Repair; Faculty of Medical and Human Sciences; University of Manchester; Manchester UK
| | - Iain S. Haslam
- Institute of Inflammation and Repair; Faculty of Medical and Human Sciences; University of Manchester; Manchester UK
| | | | - Catherine A. O'Neill
- Institute of Inflammation and Repair; Faculty of Medical and Human Sciences; University of Manchester; Manchester UK
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172
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Man G, Mauro TM, Kim PL, Hupe M, Zhai Y, Sun R, Crumrine D, Cheung C, Nuno-Gonzalez A, Elias PM, Man MQ. Topical hesperidin prevents glucocorticoid-induced abnormalities in epidermal barrier function in murine skin. Exp Dermatol 2014; 23:645-51. [PMID: 24980072 DOI: 10.1111/exd.12480] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2014] [Indexed: 12/11/2022]
Abstract
Systemic and topical glucocorticoids (GC) can cause significant adverse effects not only on the dermis, but also on epidermal structure and function. In epidermis, a striking GC-induced alteration in permeability barrier function occurs that can be attributed to an inhibition of epidermal mitogenesis, differentiation and lipid production. As prior studies in normal hairless mice demonstrated that topical applications of a flavonoid ingredient found in citrus, hesperidin, improve epidermal barrier function by stimulating epidermal proliferation and differentiation, we assessed here whether its topical applications could prevent GC-induced changes in epidermal function in murine skin and the basis for such effects. When hairless mice were co-treated topically with GC and 2% hesperidin twice-daily for 9 days, hesperidin co-applications prevented the expected GC-induced impairments of epidermal permeability barrier homoeostasis and stratum corneum (SC) acidification. These preventive effects could be attributed to a significant increase in filaggrin expression, enhanced epidermal β-glucocerebrosidase activity and accelerated lamellar bilayer maturation, the last two likely attributable to a hesperidin-induced reduction in stratum corneum pH. Furthermore, co-applications of hesperidin with GC largely prevented the expected GC-induced inhibition of epidermal proliferation. Finally, topical hesperidin increased epidermal glutathione reductase mRNA expression, which could counteract multiple functional negative effects of GC on epidermis. Together, these results show that topical hesperidin prevents GC-induced epidermal side effects by divergent mechanisms.
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Affiliation(s)
- George Man
- Dermatology Service, Veterans Affairs Medical Center, and Department of Dermatology, University of California San Francisco, San Francisco, CA, USA
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173
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Coates R, Moran J, Horsburgh MJ. Staphylococci: colonizers and pathogens of human skin. Future Microbiol 2014; 9:75-91. [PMID: 24328382 DOI: 10.2217/fmb.13.145] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Staphylococci are abundant bacteria of the human skin microbiome. Several species, particularly Staphylococcus aureus and Staphylococcus epidermidis, are opportunistic pathogens and cause significant disease. The human skin serves many functions and here we review its role as an antimicrobial barrier and the staphylococcal mechanisms to colonize and counteract the various stresses present in this niche. Successful colonization is achieved using a diversity of adhesins, surface proteins and secreted enzymes to counteract the antimicrobial peptides, enzymes and lipid matrix components present in the acid mantle. Further mechanisms enable these bacteria to overcome osmotic and acid stresses and desiccation in order to survive the exacting demands of an ever-changing landscape.
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Affiliation(s)
- Rosanna Coates
- Microbiology Research Group, Institute of Integrative Biology, University of Liverpool, Liverpool, Merseyside, L69 7ZB, UK
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174
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Kováčik A, Roh J, Vávrová K. The chemistry and biology of 6-hydroxyceramide, the youngest member of the human sphingolipid family. Chembiochem 2014; 15:1555-62. [PMID: 24990520 DOI: 10.1002/cbic.201402153] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Indexed: 11/08/2022]
Abstract
Sphingolipids are crucial for the life of the cell. In land-dwelling mammals, they are equally important outside the cell-in the extracellular space of the skin barrier-because they prevent loss of water. Although a large body of research has elucidated many of the functions of sphingolipids, their extensive structural diversity remains intriguing. A new class of sphingolipids based on 6-hydroxylated sphingosine has recently been identified in human skin. Abnormal levels of these 6-hydroxylated ceramides have repeatedly been observed in atopic dermatitis; however, neither the biosynthesis nor the roles of these unique ceramide subclasses have been established in the human body. In this Minireview, we summarize the current knowledge of 6-hydroxyceramides, including their discovery, structure, stereochemistry, occurrence in healthy and diseased human epidermis, and synthetic approaches to 6-hydroxysphingosine and related ceramides.
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Affiliation(s)
- Andrej Kováčik
- Skin Barrier Research Group, Charles University in Prague, Faculty of Pharmacy in Hradec Králové, Heyrovského 1203, 50005 Hradec Králové (Czech Republic)
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175
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Jiang Y, Xie M, Chen W, Talbot R, Maddox JF, Faraut T, Wu C, Muzny DM, Li Y, Zhang W, Stanton JA, Brauning R, Barris WC, Hourlier T, Aken BL, Searle SMJ, Adelson DL, Bian C, Cam GR, Chen Y, Cheng S, DeSilva U, Dixen K, Dong Y, Fan G, Franklin IR, Fu S, Guan R, Highland MA, Holder ME, Huang G, Ingham AB, Jhangiani SN, Kalra D, Kovar CL, Lee SL, Liu W, Liu X, Lu C, Lv T, Mathew T, McWilliam S, Menzies M, Pan S, Robelin D, Servin B, Townley D, Wang W, Wei B, White SN, Yang X, Ye C, Yue Y, Zeng P, Zhou Q, Hansen JB, Kristensen K, Gibbs RA, Flicek P, Warkup CC, Jones HE, Oddy VH, Nicholas FW, McEwan JC, Kijas J, Wang J, Worley KC, Archibald AL, Cockett N, Xu X, Wang W, Dalrymple BP. The sheep genome illuminates biology of the rumen and lipid metabolism. Science 2014; 344:1168-1173. [PMID: 24904168 DOI: 10.1126/science.1252806] [Citation(s) in RCA: 315] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Sheep (Ovis aries) are a major source of meat, milk, and fiber in the form of wool and represent a distinct class of animals that have a specialized digestive organ, the rumen, that carries out the initial digestion of plant material. We have developed and analyzed a high-quality reference sheep genome and transcriptomes from 40 different tissues. We identified highly expressed genes encoding keratin cross-linking proteins associated with rumen evolution. We also identified genes involved in lipid metabolism that had been amplified and/or had altered tissue expression patterns. This may be in response to changes in the barrier lipids of the skin, an interaction between lipid metabolism and wool synthesis, and an increased role of volatile fatty acids in ruminants compared with nonruminant animals.
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Affiliation(s)
- Yu Jiang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China.,CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia.,College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China
| | - Min Xie
- BGI-Shenzhen, Shenzhen 518083, China
| | | | - Richard Talbot
- Ediburgh Genomics, University of Edinburgh, Easter Bush, Midlothian EH 25 9RG, UK
| | - Jillian F Maddox
- Department of Veterinary Science, University of Melbourne, Victoria 3010, Australia
| | - Thomas Faraut
- INRA, Laboratoire de Génétique Cellulaire, UMR 444, Castanet-Tolosan F-31326, France
| | - Chunhua Wu
- Utah State University, Logan, UT 84322-1435-1435, USA
| | - Donna M Muzny
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Wenguang Zhang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China.,Inner Mongolia Agricultural University, Hohhot 010018, China.,Institute of ATCG, Nei Mongol Bio-Information, Hohhot, China
| | - Jo-Ann Stanton
- Department of Anatomy, University of Otago, Dunedin 9054, New Zealand
| | - Rudiger Brauning
- AgResearch, Invermay Agricultural Centre, Mosgiel 9053, New Zealand
| | - Wesley C Barris
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Thibaut Hourlier
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, UK.,European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, United Kingdom
| | - Bronwen L Aken
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, UK.,European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, United Kingdom
| | - Stephen M J Searle
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, UK
| | - David L Adelson
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Chao Bian
- BGI-Shenzhen, Shenzhen 518083, China
| | - Graham R Cam
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Yulin Chen
- College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China
| | | | - Udaya DeSilva
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Karen Dixen
- Department of Biology, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Yang Dong
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China
| | | | - Ian R Franklin
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Shaoyin Fu
- Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Rui Guan
- BGI-Shenzhen, Shenzhen 518083, China
| | - Margaret A Highland
- USDA-ARS Animal Disease Research Unit, Pullman, WA 99164 USA.,Department of Veterinary Microbiology & Pathology, Washington State University, Pullman, WA 99164 USA
| | - Michael E Holder
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Aaron B Ingham
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Shalini N Jhangiani
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Divya Kalra
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Christie L Kovar
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Sandra L Lee
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Xin Liu
- BGI-Shenzhen, Shenzhen 518083, China
| | | | - Tian Lv
- BGI-Shenzhen, Shenzhen 518083, China
| | - Tittu Mathew
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Sean McWilliam
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Moira Menzies
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | | | - David Robelin
- INRA, Laboratoire de Génétique Cellulaire, UMR 444, Castanet-Tolosan F-31326, France
| | - Bertrand Servin
- INRA, Laboratoire de Génétique Cellulaire, UMR 444, Castanet-Tolosan F-31326, France
| | - David Townley
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | | | - Bin Wei
- BGI-Shenzhen, Shenzhen 518083, China.,Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Stephen N White
- USDA-ARS Animal Disease Research Unit, Pullman, WA 99164 USA.,Department of Veterinary Microbiology & Pathology, Washington State University, Pullman, WA 99164 USA
| | | | - Chen Ye
- BGI-Shenzhen, Shenzhen 518083, China
| | - Yaojing Yue
- Lanzhou Institute of Husbandry and Pharmaceutical Science, Lanzhou,730050,China
| | - Peng Zeng
- BGI-Shenzhen, Shenzhen 518083, China
| | - Qing Zhou
- BGI-Shenzhen, Shenzhen 518083, China
| | - Jacob B Hansen
- Department of Biology, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Karsten Kristensen
- Department of Biology, University of Copenhagen, DK-2200 Copenhagen N, Denmark
| | - Richard A Gibbs
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Paul Flicek
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, United Kingdom
| | | | - Huw E Jones
- Biosciences KTN, The Roslin Institute, Easter Bush, Midlothian, EH25 9RG, UK
| | - V Hutton Oddy
- School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia
| | - Frank W Nicholas
- Faculty of Veterinary Science, University of Sydney, NSW 2006, Australia
| | - John C McEwan
- AgResearch, Invermay Agricultural Centre, Mosgiel 9053, New Zealand
| | - James Kijas
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
| | - Jun Wang
- BGI-Shenzhen, Shenzhen 518083, China.,Department of Biology, University of Copenhagen, DK-2200 Copenhagen N, Denmark.,Princess Al Jawhara Center of Excellence in the Research of Hereditary Disorders, King Abdulaziz University, Jeddah 21589, Saudi Arabia.,Macau University of Science and Technology, Macau 999078, China
| | - Kim C Worley
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Alan L Archibald
- The Roslin Institute and R(D)SVS, University of Edinburgh, Easter Bush, Midlothian EH 25 9RG, UK
| | | | - Xun Xu
- BGI-Shenzhen, Shenzhen 518083, China
| | - Wen Wang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China
| | - Brian P Dalrymple
- CSIRO Animal Food and Health Sciences, St Lucia, QLD 4067, Australia
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176
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Natarajan VT, Ganju P, Ramkumar A, Grover R, Gokhale RS. Multifaceted pathways protect human skin from UV radiation. Nat Chem Biol 2014; 10:542-51. [DOI: 10.1038/nchembio.1548] [Citation(s) in RCA: 144] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 05/02/2014] [Indexed: 02/07/2023]
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177
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Ní Raghallaigh S, Powell F. Epidermal hydration levels in patients with rosacea improve after minocycline therapy. Br J Dermatol 2014; 171:259-66. [DOI: 10.1111/bjd.12770] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/01/2013] [Indexed: 11/29/2022]
Affiliation(s)
- S. Ní Raghallaigh
- The Charles Institute of Dermatology; University College Dublin; Belfield Dublin 4 Ireland
- Department of Dermatology; Mater Misericordiae University Hospital; Dublin 7 Ireland
| | - F.C. Powell
- The Charles Institute of Dermatology; University College Dublin; Belfield Dublin 4 Ireland
- Department of Dermatology; Mater Misericordiae University Hospital; Dublin 7 Ireland
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178
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Zaima N, Goto-Inoue N, Moriyama T. Matrix-Assisted Laser Desorption/Ionization Imaging Mass Spectrometry: New Technology for Vascular Pathology. J Vasc Res 2014; 51:144-8. [DOI: 10.1159/000362123] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 02/11/2014] [Indexed: 01/30/2023] Open
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179
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Visscher M, Narendran V. The Ontogeny of Skin. Adv Wound Care (New Rochelle) 2014; 3:291-303. [PMID: 24761361 DOI: 10.1089/wound.2013.0467] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 06/21/2013] [Indexed: 12/25/2022] Open
Abstract
Significance: During gestation, fetal skin progresses from a single layer derived from ectoderm to a complex, multi-layer tissue with the stratum corneum (SC) as the outermost layer. Innate immunity is a conferred complex process involving a balance of pro- and anti-inflammatory cytokines, structural proteins, and specific antigen-presenting cells. The SC is a part of the innate immune system as an impermeable physical barrier containing anti-microbial lipids and host defense proteins. Postnatally, the epidermis continually replenishes itself, provides a protective barrier, and repairs injuries. Recent Advances: Vernix caseosa protects the fetus during gestation and facilitates development of the SC in the aqueous uterine environment. The anti-infective, hydrating, acidification, and wound-healing properties post birth provide insights for the development of strategies that facilitate SC maturation and repair in the premature infant. Critical Issues: Reduction of infant mortality is a global health priority. Premature infants have an incompetent skin barrier putting them at risk for irritant exposure, skin compromise and life-threatening infections. Effective interventions to accelerate skin barrier maturation are compelling. Future Directions: Investigations to determine the ontogeny of barrier maturation, that is, SC structure, composition, cohesiveness, permeability, susceptibility to injury, and microflora, as a function of gestational age are essential. Clinicians need to know when the premature skin barrier becomes fully competent and comparable to healthy newborn skin. This will guide the development of innovative strategies for optimizing skin barrier development.
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Affiliation(s)
- Marty Visscher
- Skin Sciences Program, Division of Plastic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
- Department of Surgery, College of Medicine, University of Cincinnati, Cincinnati, Ohio
| | - Vivek Narendran
- Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
- Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, Ohio
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180
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Sjövall P, Greve TM, Clausen SK, Moller K, Eirefelt S, Johansson B, Nielsen KT. Imaging of distribution of topically applied drug molecules in mouse skin by combination of time-of-flight secondary ion mass spectrometry and scanning electron microscopy. Anal Chem 2014; 86:3443-52. [PMID: 24568123 DOI: 10.1021/ac403924w] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the development of topical drugs intended for local effects in the skin, one of the major challenges is to achieve drug penetration through the external barrier of the skin, stratum corneum, and secure exposure to the viable skin layers. Mass spectrometric imaging offers an opportunity to study drug penetration in a variety of skin models by mapping the spatial distribution in different skin layers after topical application of the drug. In this study, we used time-of-flight secondary ion mass spectrometry (TOF-SIMS) and scanning electron microscopy (SEM) to image the distribution of three drug molecules in skin tissue cross sections of inflamed mouse ear. The three compounds, roflumilast, tofacitinib, and ruxolitinib, were topically administered to the mouse ears, which were subsequently cryosectioned and thawed for the analyses. The results reveal that the combination of TOF-SIMS and SEM was beneficial for interpretation of drug distribution. SEM identified the different skin layers, while spatial distributions of all three compounds could be visualized by TOF-SIMS, showing that the drug was primarily distributed into, or on the top of, the stratum corneum. Imaging of endogenous skin components like cholesterol, phospholipids, ceramides, and free fatty acids showed distributions in good agreement with the literature. One limitation of the TOF-SIMS method is sensitivity, typically allowing for analysis in the millimolar range rather than the pharmacologically relevant micromolar range. However, the data presented demonstrate the potential of the technique for studying the penetration of drugs with different physicochemical properties in skin.
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Affiliation(s)
- Peter Sjövall
- SP Technical Research Institute of Sweden , Post Office Box 857, SE-50115 Borås, Sweden
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181
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Danso MO, van Drongelen V, Mulder A, van Esch J, Scott H, van Smeden J, El Ghalbzouri A, Bouwstra JA. TNF-α and Th2 cytokines induce atopic dermatitis-like features on epidermal differentiation proteins and stratum corneum lipids in human skin equivalents. J Invest Dermatol 2014; 134:1941-1950. [PMID: 24518171 DOI: 10.1038/jid.2014.83] [Citation(s) in RCA: 218] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 01/23/2014] [Accepted: 01/24/2014] [Indexed: 02/07/2023]
Abstract
Atopic dermatitis (AD) is a chronic inflammatory skin disease in which the skin barrier function is disrupted. In this inflammatory AD environment, cytokines are upregulated, but the cytokine effect on the AD skin barrier is not fully understood. We aimed to investigate the influence of Th2 (IL-4, IL-13, IL-31) and pro-inflammatory (tumor necrosis factor alpha (TNF-α)) cytokines on epidermal morphogenesis, proliferation, differentiation, and stratum corneum lipid properties. For this purpose, we used the Leiden epidermal model (LEM) in which the medium was supplemented with these cytokines. Our results show that IL-4, IL-13, IL-31, and TNF-α induce spongiosis, augment TSLP secretion by keratinocytes, and alter early and terminal differentiation-protein expression in LEMs. TNF-α alone or in combination with Th2 cytokines decreases the level of long chain free fatty acids (FFAs) and ester linked ω-hydroxy (EO) ceramides, consequently affecting the lipid organization. IL-31 increases long chain FFAs in LEMs but decreases relative abundance of EO ceramides. These findings clearly show that supplementation with TNF-α and Th2 cytokines influence epidermal morphogenesis and barrier function. As a result, these LEMs show similar characteristics as found in AD skin and can be used as an excellent tool for screening formulations and drugs for the treatment of AD.
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Affiliation(s)
- Mogbekeloluwa O Danso
- Department of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands
| | - Vincent van Drongelen
- Department of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands; Department of Dermatology, Leiden University Medical Centre, Leiden, The Netherlands
| | - Aat Mulder
- Department of Dermatology, Leiden University Medical Centre, Leiden, The Netherlands
| | - Jeltje van Esch
- Department of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands
| | - Hannah Scott
- Department of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands
| | - Jeroen van Smeden
- Department of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands
| | | | - Joke A Bouwstra
- Department of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands.
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182
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In vitro model systems for studying the impact of organic chemicals on the skin barrier lipids. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:310-8. [DOI: 10.1016/j.bbamem.2013.10.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 09/26/2013] [Accepted: 10/03/2013] [Indexed: 11/17/2022]
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183
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Soon CF, Omar WIW, Berends RF, Nayan N, Basri H, Tee KS, Youseffi M, Blagden N, Denyer MCT. Biophysical characteristics of cells cultured on cholesteryl ester liquid crystals. Micron 2014; 56:73-9. [DOI: 10.1016/j.micron.2013.10.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 10/14/2013] [Accepted: 10/14/2013] [Indexed: 11/25/2022]
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184
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Skolová B, Janůšová B, Zbytovská J, Gooris G, Bouwstra J, Slepička P, Berka P, Roh J, Palát K, Hrabálek A, Vávrová K. Ceramides in the skin lipid membranes: length matters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:15624-15633. [PMID: 24283654 DOI: 10.1021/la4037474] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Ceramides are essential constituents of the skin barrier that allow humans to live on dry land. Reduced levels of ceramides have been associated with skin diseases, e.g., atopic dermatitis. However, the structural requirements and mechanisms of action of ceramides are not fully understood. Here, we report the effects of ceramide acyl chain length on the permeabilities and biophysics of lipid membranes composed of ceramides (or free sphingosine), fatty acids, cholesterol, and cholesterol sulfate. Short-chain ceramides increased the permeability of the lipid membranes compared to a long-chain ceramide with maxima at 4-6 carbons in the acyl. By a combination of differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray diffraction, Langmuir monolayers, and atomic force microscopy, we found that the reason for this effect in short ceramides was a lower proportion of tight orthorhombic packing and phase separation of continuous short ceramide-enriched domains with shorter lamellar periodicity compared to native long ceramides. Thus, long acyl chains in ceramides are essential for the formation of tightly packed impermeable lipid lamellae. Moreover, the model skin lipid membranes are a valuable tool to study the relationships between the lipid structure and composition, lipid organization, and the membrane permeability.
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Affiliation(s)
- Barbora Skolová
- Charles University in Prague , Faculty of Pharmacy, Heyrovského 1203, 50005 Hradec Králové, Czech Republic
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185
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Haller JF, Cavallaro P, Hernandez NJ, Dolat L, Soscia SJ, Welti R, Grabowski GA, Fitzgerald ML, Freeman MW. Endogenous β-glucocerebrosidase activity in Abca12⁻/⁻epidermis elevates ceramide levels after topical lipid application but does not restore barrier function. J Lipid Res 2013; 55:493-503. [PMID: 24293640 DOI: 10.1194/jlr.m044941] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
ABCA12 mutations disrupt the skin barrier and cause harlequin ichthyosis. We previously showed Abca12(-/-) skin has increased glucosylceramide (GlcCer) and correspondingly lower amounts of ceramide (Cer). To examine why loss of ABCA12 leads to accumulation of GlcCer, de novo sphingolipid synthesis was assayed using [(14)C]serine labeling in ex vivo skin cultures. A defect was found in β-glucocerebrosidase (GCase) processing of newly synthesized GlcCer species. This was not due to a decline in GCase function. Abca12(-/-) epidermis had 5-fold more GCase protein (n = 4, P < 0.01), and a 5-fold increase in GCase activity (n = 3, P < 0.05). As with Abca12(+/+) epidermis, immunostaining in null skin showed a typical interstitial distribution of the GCase protein in the Abca12(-/-) stratum corneum. Hence, we tested whether the block in GlcCer conversion could be circumvented by topically providing GlcCer. This approach restored up to 15% of the lost Cer products of GCase activity in the Abca12(-/-) epidermis. However, this level of barrier ceramide replacement did not significantly reduce trans-epidermal water loss function. Our results indicate loss of ABCA12 function results in a failure of precursor GlcCer substrate to productively interact with an intact GCase enzyme, and they support a model of ABCA12 function that is critical for transporting GlcCer into lamellar bodies.
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Affiliation(s)
- Jorge F Haller
- Lipid Metabolism Unit and Center for Computational and Integrative Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114
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186
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Feingold KR, Elias PM. Role of lipids in the formation and maintenance of the cutaneous permeability barrier. Biochim Biophys Acta Mol Cell Biol Lipids 2013; 1841:280-94. [PMID: 24262790 DOI: 10.1016/j.bbalip.2013.11.007] [Citation(s) in RCA: 245] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 11/01/2013] [Accepted: 11/10/2013] [Indexed: 12/18/2022]
Abstract
The major function of the skin is to form a barrier between the internal milieu and the hostile external environment. A permeability barrier that prevents the loss of water and electrolytes is essential for life on land. The permeability barrier is mediated primarily by lipid enriched lamellar membranes that are localized to the extracellular spaces of the stratum corneum. These lipid enriched membranes have a unique structure and contain approximately 50% ceramides, 25% cholesterol, and 15% free fatty acids with very little phospholipid. Lamellar bodies, which are formed during the differentiation of keratinocytes, play a key role in delivering the lipids from the stratum granulosum cells into the extracellular spaces of the stratum corneum. Lamellar bodies contain predominantly glucosylceramides, phospholipids, and cholesterol and following the exocytosis of lamellar lipids into the extracellular space of the stratum corneum these precursor lipids are converted by beta glucocerebrosidase and phospholipases into the ceramides and fatty acids, which comprise the lamellar membranes. The lipids required for lamellar body formation are derived from de novo synthesis by keratinocytes and from extra-cutaneous sources. The lipid synthetic pathways and the regulation of these pathways are described in this review. In addition, the pathways for the uptake of extra-cutaneous lipids into keratinocytes are discussed. This article is part of a Special Issue entitled The Important Role of Lipids in the Epidermis and their Role in the Formation and Maintenance of the Cutaneous Barrier. Guest Editors: Kenneth R. Feingold and Peter Elias.
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Affiliation(s)
- Kenneth R Feingold
- Metabolism Section, Medicine Service and Dermatology Service, Department of Veterans Affairs Medical Center, University of California San Francisco, San Francisco, CA 94121, USA.
| | - Peter M Elias
- Metabolism Section, Medicine Service and Dermatology Service, Department of Veterans Affairs Medical Center, University of California San Francisco, San Francisco, CA 94121, USA
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187
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188
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Nakajima K, Terao M, Takaishi M, Kataoka S, Goto-Inoue N, Setou M, Horie K, Sakamoto F, Ito M, Azukizawa H, Kitaba S, Murota H, Itami S, Katayama I, Takeda J, Sano S. Barrier abnormality due to ceramide deficiency leads to psoriasiform inflammation in a mouse model. J Invest Dermatol 2013; 133:2555-2565. [PMID: 23633022 DOI: 10.1038/jid.2013.199] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 01/16/2013] [Accepted: 01/23/2013] [Indexed: 11/09/2022]
Abstract
It has been recognized that ceramides are decreased in the epidermis of patients with psoriasis and atopic dermatitis. Here, we generated Sptlc2 (serine palmitoyltransferase long-chain base subunit 2)-targeted mice (SPT-cKO mice), thereby knocking out serine palmitoyltransferase (SPT), the critical enzyme for ceramide biosynthesis, in keratinocytes. SPT-cKO mice showed decreased ceramide levels in the epidermis, which impaired water-holding capacity and barrier function. From 2 weeks of age, they developed skin lesions with histological aberrations including hyperkeratosis, acanthosis, loss of the granular layer, and inflammatory cell infiltrates. Epidermal Langerhans cells showed persistent activation and enhanced migration to lymph nodes. Skin lesions showed upregulation of psoriasis-associated genes, such as IL-17A, IL-17F, IL-22, S100A8, S100A9, and β-defensins. In the skin lesions and draining lymph nodes, there were increased numbers of γδ T cells that produced IL-17 (γδ-17 cells), most of which also produced IL-22, as do Th17 cells. Furthermore, IL-23-producing CD11c(+) cells were observed in the lesions. In vivo treatment of SPT-cKO mice with an anti-IL-12/23p40 antibody ameliorated the skin lesions and reduced the numbers of γδ-17 cells. Therefore, we conclude that a ceramide deficiency in the epidermis leads to psoriasis-like lesions in mice, probably mediated by IL-23-dependent IL-22-producing γδ-17 cells.
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Affiliation(s)
- Kimiko Nakajima
- Department of Dermatology, Kochi Medical School Kochi University, Nankoku, Japan
| | - Mika Terao
- Department of Dermatology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Mikiro Takaishi
- Department of Dermatology, Kochi Medical School Kochi University, Nankoku, Japan
| | - Sayo Kataoka
- Science Research Center, Kochi University, Nankoku, Japan
| | - Naoko Goto-Inoue
- Department of Health Promotion Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan; Department of Cell Biology and Anatomy, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Mitsutoshi Setou
- Department of Cell Biology and Anatomy, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Kyoji Horie
- Department of Social and Environmental Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Fumiko Sakamoto
- Division of Dermatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Masaaki Ito
- Division of Dermatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Hiroaki Azukizawa
- Department of Dermatology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Shun Kitaba
- Department of Dermatology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hiroyuki Murota
- Department of Dermatology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Satoshi Itami
- Department of Regenerative Dermatology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Ichiro Katayama
- Department of Dermatology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Junji Takeda
- Department of Social and Environmental Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Shigetoshi Sano
- Department of Dermatology, Kochi Medical School Kochi University, Nankoku, Japan.
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189
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Abstract
A key function of the skin is to provide a permeability barrier to restrict the movement of water, electrolytes, and other small molecules between the outside environment and the internal milieu. Following disruption of the permeability barrier, there is a rapid restoration of barrier function, and one of the key signals initiating this repair response is a decrease in the concentration of calcium in the outer epidermis. In this issue, Borkowski et al. present evidence showing that activation of Toll receptor 3 by double-stranded RNA may be another pathway for activation of permeability barrier repair. These results provide further evidence for a link between innate immunity and the permeability barrier.
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Affiliation(s)
- Kenneth R Feingold
- Metabolism Section (111F), Department of Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, California 94121, USA.
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190
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Xu W, Jia S, Xie P, Zhong A, Galiano RD, Mustoe TA, Hong SJ. The expression of proinflammatory genes in epidermal keratinocytes is regulated by hydration status. J Invest Dermatol 2013; 134:1044-1055. [PMID: 24226202 DOI: 10.1038/jid.2013.425] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Revised: 09/09/2013] [Accepted: 09/13/2013] [Indexed: 01/08/2023]
Abstract
Mucosal wounds heal more rapidly, exhibit less inflammation, and are associated with minimal scarring when compared with equivalent cutaneous wounds. We previously demonstrated that cutaneous epithelium exhibits an exaggerated response to injury compared with mucosal epithelium. We hypothesized that treatment of injured skin with a semiocclusive dressing preserves the hydration of the skin and results in a wound healing phenotype that more closely resembles that of mucosa. Here we explored whether changes in hydration status alter epidermal gene expression patterns in rabbit partial-thickness incisional wounds. Using microarray studies on injured epidermis, we showed that global gene expression patterns in highly occluded versus non-occluded wounds are distinct. Many genes including IL-1β, IL-8, TNF-α (tumor necrosis factor-α), and COX-2 (cyclooxygenase 2) are upregulated in non-occluded wounds compared with highly occluded wounds. In addition, decreased levels of hydration resulted in an increased expression of proinflammatory genes in human ex vivo skin culture (HESC) and stratified keratinocytes. Hierarchical analysis of genes using RNA interference showed that both TNF-α and IL-1β regulate the expression of IL-8 through independent pathways in response to reduced hydration. Furthermore, both gene knockdown and pharmacological inhibition studies showed that COX-2 mediates the TNF-α/IL-8 pathway by increasing the production of prostaglandin E2 (PGE2). IL-8 in turn controls the production of matrix metalloproteinase-9 in keratinocytes. Our data show that hydration status directly affects the expression of inflammatory signaling in the epidermis. The identification of genes involved in the epithelial hydration pathway provides an opportunity to develop strategies to reduce scarring and optimize wound healing.
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Affiliation(s)
- Wei Xu
- Laboratory for Wound Repair and Regenerative Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Shengxian Jia
- Laboratory for Wound Repair and Regenerative Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Ping Xie
- Laboratory for Wound Repair and Regenerative Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Aimei Zhong
- Laboratory for Wound Repair and Regenerative Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA; Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Robert D Galiano
- Laboratory for Wound Repair and Regenerative Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Thomas A Mustoe
- Laboratory for Wound Repair and Regenerative Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
| | - Seok J Hong
- Laboratory for Wound Repair and Regenerative Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
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191
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Heuke S, Vogler N, Meyer T, Akimov D, Kluschke F, Röwert-Huber HJ, Lademann J, Dietzek B, Popp J. Multimodal mapping of human skin. Br J Dermatol 2013; 169:794-803. [DOI: 10.1111/bjd.12427] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/05/2013] [Indexed: 01/20/2023]
Affiliation(s)
- S. Heuke
- Institute of Photonic Technology Jena; Albert-Einstein-Straße 9 07745 Jena Germany
| | - N. Vogler
- Institute of Photonic Technology Jena; Albert-Einstein-Straße 9 07745 Jena Germany
| | - T. Meyer
- Institute of Photonic Technology Jena; Albert-Einstein-Straße 9 07745 Jena Germany
| | - D. Akimov
- Institute of Photonic Technology Jena; Albert-Einstein-Straße 9 07745 Jena Germany
| | - F. Kluschke
- Department of Dermatology, Venerology and Allergology; Charité - Universitätsmedizin Berlin; Charitéplatz 1 10117 Berlin Germany
| | - H.-J. Röwert-Huber
- Department of Dermatology, Venerology and Allergology; Charité - Universitätsmedizin Berlin; Charitéplatz 1 10117 Berlin Germany
| | - J. Lademann
- Department of Dermatology, Venerology and Allergology; Charité - Universitätsmedizin Berlin; Charitéplatz 1 10117 Berlin Germany
| | - B. Dietzek
- Institute of Photonic Technology Jena; Albert-Einstein-Straße 9 07745 Jena Germany
- Institute of Physical Chemistry and Abbe Center of Photonics; Friedrich-Schiller-University Jena; Helmholtzweg 4 07743 Jena Germany
| | - J. Popp
- Institute of Photonic Technology Jena; Albert-Einstein-Straße 9 07745 Jena Germany
- Institute of Physical Chemistry and Abbe Center of Photonics; Friedrich-Schiller-University Jena; Helmholtzweg 4 07743 Jena Germany
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192
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Bloksgaard M, Brewer JR, Pashkovski E, Ananthapadmanabhan KP, Sørensen JA, Bagatolli LA. Effect of detergents on the physicochemical properties of skin stratum corneum: a two-photon excitation fluorescence microscopy study. Int J Cosmet Sci 2013; 36:39-45. [PMID: 23962033 DOI: 10.1111/ics.12089] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Accepted: 08/17/2013] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Understanding the structural and dynamical features of skin is critical for advancing innovation in personal care and drug discovery. Synthetic detergent mixtures used in commercially available body wash products are thought to be less aggressive towards the skin barrier when compared to conventional detergents. The aim of this work is to comparatively characterize the effect of a mild synthetic cleanser mixture (SCM) and sodium dodecyl sulphate (SDS) on the hydration state of the intercellular lipid matrix and on proton activity of excised skin stratum corneum (SC). METHOD Experiments were performed using two-photon excitation fluorescence microscopy. Fluorescent images of fluorescence reporters sensitive to proton activity and hydration of SC were obtained in excised skin and examined in the presence and absence of SCM and SDS detergents. RESULTS Hydration of the intercellular lipid matrix to a depth of 10 μm into the SC was increased upon treatment with SCM, whereas SDS shows this effect only at the very surface of SC. The proton activity of SC remained unaffected by treatment with either detergent. CONCLUSION While our study indicates that the SC is very resistant to external stimuli, it also shows that, in contrast to the response to SDS, SCM to some extent modulates the in-depth hydration properties of the intercellular lipid matrix within excised skin SC.
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Affiliation(s)
- M Bloksgaard
- Membrane Biophysics and Biophotonics Group/MEMPHYS-Center, Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark
| | - J R Brewer
- Membrane Biophysics and Biophotonics Group/MEMPHYS-Center, Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark
| | - E Pashkovski
- Unilever R&D, 40 Merritt Blvd., Trumbull, CT, 06611, USA
| | | | - J A Sørensen
- Department of Plastic Surgery, Odense University Hospital, DK-5000, Odense C, Denmark
| | - L A Bagatolli
- Membrane Biophysics and Biophotonics Group/MEMPHYS-Center, Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark
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193
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Affiliation(s)
- Jessica S. Lilley
- Section of Prevention of Cardiovascular Disease; Vanderbilt University Medical Center; Nashville Tennessee
| | - MacRae F. Linton
- Section of Prevention of Cardiovascular Disease; Vanderbilt University Medical Center; Nashville Tennessee
| | - Sergio Fazio
- Section of Prevention of Cardiovascular Disease; Vanderbilt University Medical Center; Nashville Tennessee
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194
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Vávrová K, Henkes D, Strüver K, Sochorová M, Školová B, Witting MY, Friess W, Schreml S, Meier RJ, Schäfer-Korting M, Fluhr JW, Küchler S. Filaggrin deficiency leads to impaired lipid profile and altered acidification pathways in a 3D skin construct. J Invest Dermatol 2013; 134:746-753. [PMID: 24061166 DOI: 10.1038/jid.2013.402] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 08/01/2013] [Accepted: 08/15/2013] [Indexed: 01/09/2023]
Abstract
Mutations in the filaggrin (FLG) gene are strongly associated with common dermatological disorders such as atopic dermatitis. However, the exact underlying pathomechanism is still ambiguous. Here, we investigated the impact of FLG on skin lipid composition, organization, and skin acidification using a FLG knockdown (FLG-) skin construct. Initially, sodium/hydrogen antiporter (NHE-1) activity was sufficient to maintain the acidic pH (5.5) of the reconstructed skin. At day 7, the FLG degradation products urocanic (UCA) and pyrrolidone-5-carboxylic acid (PCA) were significantly decreased in FLG- constructs, but the skin surface pH was still physiological owing to an upregulation of NHE-1. At day 14, secretory phospholipase A2 (sPLA2) IIA, which converts phospholipids to fatty acids, was significantly more activated in FLG- than in FLG+. Although NHE-1 and sPLA2 were able to compensate the FLG deficiency, maintain the skin surface pH, and ensured ceramide processing (no differences detected), an accumulation of free fatty acids (2-fold increase) led to less ordered intercellular lipid lamellae and higher permeability of the FLG- constructs. The interplay of the UCA/PCA and the sPLA2/NHE-1 acidification pathways of the skin and the impact of FLG insufficiency on skin lipid composition and organization in reconstructed skin are described.
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Affiliation(s)
- Kateřina Vávrová
- Faculty of Pharmacy, Charles University in Prague, Hradec Kralove, Czech Republic
| | - Dominika Henkes
- Institute for Pharmacy, Pharmacology and Toxicology, Freie Universität Berlin, Berlin, Germany
| | - Kay Strüver
- Department of Pharmacy, Ludwig-Maximilians University Munich, Munich, Germany
| | - Michaela Sochorová
- Faculty of Pharmacy, Charles University in Prague, Hradec Kralove, Czech Republic
| | - Barbora Školová
- Faculty of Pharmacy, Charles University in Prague, Hradec Kralove, Czech Republic
| | - Madeleine Y Witting
- Department of Pharmacy, Ludwig-Maximilians University Munich, Munich, Germany
| | - Wolfgang Friess
- Department of Pharmacy, Ludwig-Maximilians University Munich, Munich, Germany
| | - Stephan Schreml
- Department of Dermatology, University Medical Center Regensburg, Regensburg, Germany
| | - Robert J Meier
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Regensburg, Germany
| | - Monika Schäfer-Korting
- Institute for Pharmacy, Pharmacology and Toxicology, Freie Universität Berlin, Berlin, Germany
| | - Joachim W Fluhr
- Department of Dermatology, Charité University Clinic, Berlin, Germany
| | - Sarah Küchler
- Institute for Pharmacy, Pharmacology and Toxicology, Freie Universität Berlin, Berlin, Germany.
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195
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Rizzo WB. Fatty aldehyde and fatty alcohol metabolism: review and importance for epidermal structure and function. Biochim Biophys Acta Mol Cell Biol Lipids 2013; 1841:377-89. [PMID: 24036493 DOI: 10.1016/j.bbalip.2013.09.001] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 09/02/2013] [Accepted: 09/04/2013] [Indexed: 01/23/2023]
Abstract
Normal fatty aldehyde and alcohol metabolism is essential for epidermal differentiation and function. Long-chain aldehydes are produced by catabolism of several lipids including fatty alcohols, sphingolipids, ether glycerolipids, isoprenoid alcohols and certain aliphatic lipids that undergo α- or ω-oxidation. The fatty aldehyde generated by these pathways is chiefly metabolized to fatty acid by fatty aldehyde dehydrogenase (FALDH, alternately known as ALDH3A2), which also functions to oxidize fatty alcohols as a component of the fatty alcohol:NAD oxidoreductase (FAO) enzyme complex. Genetic deficiency of FALDH/FAO in patients with Sjögren-Larsson syndrome (SLS) results in accumulation of fatty aldehydes, fatty alcohols and related lipids (ether glycerolipids, wax esters) in cultured keratinocytes. These biochemical changes are associated with abnormalities in formation of lamellar bodies in the stratum granulosum and impaired delivery of their precursor membranes to the stratum corneum (SC). The defective extracellular SC membranes are responsible for a leaky epidermal water barrier and ichthyosis. Although lamellar bodies appear to be the pathogenic target for abnormal fatty aldehyde/alcohol metabolism in SLS, the precise biochemical mechanisms are yet to be elucidated. Nevertheless, studies in SLS highlight the critical importance of FALDH and normal fatty aldehyde/alcohol metabolism for epidermal function. This article is part of a Special Issue entitled The Important Role of Lipids in the Epidermis and their Role in the Formation and Maintenance of the Cutaneous Barrier. Guest Editors: Kenneth R. Feingold and Peter Elias.
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Affiliation(s)
- William B Rizzo
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198-5456, USA.
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196
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Cañueto J, Girós M, González-Sarmiento R. The role of the abnormalities in the distal pathway of cholesterol biosynthesis in the Conradi-Hünermann-Happle syndrome. Biochim Biophys Acta Mol Cell Biol Lipids 2013; 1841:336-44. [PMID: 24036494 DOI: 10.1016/j.bbalip.2013.09.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 09/02/2013] [Accepted: 09/04/2013] [Indexed: 11/28/2022]
Abstract
Conradi-Hünermann-Happle syndrome (CDPX2, OMIM 302960) is an inherited X-linked dominant variant of chondrodysplasia punctata (CP) caused by mutations in one gene of the distal pathway of cholesterol biosynthesis. It exhibits intense phenotypic variation and primarily affects the skin, bones and eyes. The ichthyosis following Blaschko's lines, chondrodysplasia punctata and cataracts are the typical clinical findings. The cardinal biochemical features are an increase in 8(9)-cholestenol and 8-dehydrocholesterol (8DHC), which suggest a deficiency in 3β-hydroxysteroid-Δ8,Δ7-isomerase, also called emopamil binding protein (EBP). The EBP gene is located on the short arm of the X chromosome (Xp11.22-p11.23) and encodes a 230 amino acid protein with dual function. Explaining the clinical phenotype in CDPX2 implies an understanding of both the genetics and biochemical features of this disease. CDPX2 displays an X-linked dominant pattern of inheritance, which is responsible for the distribution of lesions in some tissues. The clinical phenotype in CDPX2 results directly from impairment in cholesterol biosynthesis, and indirectly from abnormalities in the hedgehog signaling protein pathways. This article is part of a Special Issue entitled The Important Role of Lipids in the Epidermis and their Role in the Formation and Maintenance of the Cutaneous Barrier. Guest Editors: Kenneth R. Feingold and Peter Elias.
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Affiliation(s)
- Javier Cañueto
- Department of Dermatology, University Hospital of Salamanca, Paseo San Vicente 58-182, 37007 Salamanca, Spain; IBSAL (Instituto de Investigación Biosanitaria de Salamanca), Spain.
| | - Marisa Girós
- Seccio Errors Congenits del Metabolisme, Servei de Bioquímica Clínica i Genética Molecular, Hospital Clinic Barcelona, Barcelona, Spain
| | - Rogelio González-Sarmiento
- IBSAL (Instituto de Investigación Biosanitaria de Salamanca), Spain; Molecular Medicine Unit, Faculty of Medicine, University of Salamanca, Campus Miguel de Unamuno S/N, Salamanca 37007, Spain; Laboratory 14, IBMCC-CSIC, University of Salamanca, Campus Miguel de Unamuno S/N, Salamanca 37007, Spain
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197
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Interferon-γ decreases ceramides with long-chain fatty acids: possible involvement in atopic dermatitis and psoriasis. J Invest Dermatol 2013; 134:712-718. [PMID: 24008422 DOI: 10.1038/jid.2013.364] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 08/06/2013] [Accepted: 08/07/2013] [Indexed: 02/08/2023]
Abstract
Ceramide (CER) with long-chain fatty acids (FAs) in the human stratum corneum (SC) is important for the skin barrier functions. Changes in the CER profile have been associated with abnormal permeability of dermatoses such as atopic dermatitis (AD) and psoriasis. In addition, interferon-γ (IFN-γ) has been known to be abundant in both AD and psoriatic skin lesions. In this study, we aimed to identify the mechanism underlying the alteration of FA chain length of CERs in these diseases. Mass spectrometry analysis of CERs in the SC showed that the proportion of CERs with long-chain FAs was significantly lower in AD and psoriasis patients than in healthy controls, and this reduction was more pronounced in psoriasis than in AD. Using cultured human keratinocytes and epidermal sheets, we found that only IFN-γ among various cytokines decreased the mRNA expression of elongase of long-chain fatty acids (ELOVL) and ceramide synthase (CerS), enzymes involved in FA chain elongation. Furthermore, quantitative analysis showed that IFN-γ decreased the levels of CERs with long-chain FAs. These results suggest that IFN-γ decreases CERs with long-chain FAs through the downregulation of ELOVL and CerS and that this mechanism may be involved in the CER profile alteration observed in psoriasis and AD.
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198
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Jiang YJ, Kim P, Uchida Y, Elias PM, Bikle DD, Grunfeld C, Feingold KR. Ceramides stimulate caspase-14 expression in human keratinocytes. Exp Dermatol 2013; 22:113-8. [PMID: 23362869 DOI: 10.1111/exd.12079] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/17/2012] [Indexed: 12/30/2022]
Abstract
Caspase-14 is an enzyme that is expressed predominantly in cornifying epithelia and catalyses the degradation of profilaggrin. Additionally, caspase-14 plays an important role in the terminal differentiation of keratinocytes. However, how caspase-14 expression is regulated remains largely unknown. Here we demonstrate that ceramides (C(2) -Cer and C(6) -Cer), but not other sphingolipids (C(8) -glucosylceramides, sphinganine, sphingosine-1-phosphate or ceramide-1-phosphate), increase caspase-14 expression (mRNA and protein) in cultured human keratinocytes in a dose- and time-dependent manner. Inhibitors of glucosylceramide synthase and ceramidase increase endogenous ceramide levels and also increase caspase-14 expression, indicating an important regulatory role for ceramides and suggesting that the conversion of ceramides to other metabolites is not required. The increase in caspase-14 expression induced by ceramides is first seen at 16 h and requires new protein synthesis, suggesting that the ceramide-induced increase is likely an indirect effect. Furthermore, ceramides increase caspase-14 gene expression primarily by increasing transcription. Blocking de novo synthesis of ceramides does not affect caspase-14 expression, suggesting that basal expression is not dependent on ceramide levels. These studies show that ceramides, an important structural lipid, stimulate caspase-14 expression providing a mechanism for coordinately regulating the formation of lipid lamellar membranes with the formation of corneocytes.
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Affiliation(s)
- Yan J Jiang
- Metabolism Section, Veterans Affairs Medical Center, Northern California Institute for Research and Education, University of California at San Francisco, San Francisco, CA 94121, USA.
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199
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Radner FPW, Fischer J. The important role of epidermal triacylglycerol metabolism for maintenance of the skin permeability barrier function. Biochim Biophys Acta Mol Cell Biol Lipids 2013; 1841:409-15. [PMID: 23928127 DOI: 10.1016/j.bbalip.2013.07.013] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 07/22/2013] [Accepted: 07/29/2013] [Indexed: 12/29/2022]
Abstract
Survival in a terrestrial, dry environment necessitates a permeability barrier for regulated permeation of water and electrolytes in the cornified layer of the skin (the stratum corneum) to minimize desiccation of the body. This barrier is formed during cornification and involves a cross-linking of corneocyte proteins as well as an extensive remodeling of lipids. The cleavage of precursor lipids from lamellar bodies by various hydrolytic enzymes generates ceramides, cholesterol, and non-esterified fatty acids for the extracellular lipid lamellae in the stratum corneum. However, the important role of epidermal triacylglycerol (TAG) metabolism during formation of a functional permeability barrier in the skin was only recently discovered. Humans with mutations in the ABHD5/CGI-58 (α/β hydrolase domain containing protein 5, also known as comparative gene identification-58, CGI-58) gene suffer from a defect in TAG catabolism that causes neutral lipid storage disease with ichthyosis. In addition, mice with deficiencies in genes involved in TAG catabolism (Abhd5/Cgi-58 knock-out mice) or TAG synthesis (acyl-CoA:diacylglycerol acyltransferase-2, Dgat2 knock-out mice) also develop severe skin permeability barrier dysfunctions and die soon after birth due to increased dehydration. As a result of these defects in epidermal TAG metabolism, humans and mice lack ω-(O)-acylceramides, which leads to malformation of the cornified lipid envelope of the skin. In healthy skin, this epidermal structure provides an interface for the linkage of lamellar membranes with corneocyte proteins to maintain permeability barrier homeostasis. This review focuses on recent advances in the understanding of biochemical mechanisms involved in epidermal neutral lipid metabolism and the generation of a functional skin permeability barrier. This article is part of a Special Issue entitled The Important Role of Lipids in the Epidermis and their Role in the Formation and Maintenance of the Cutaneous Barrier. Guest Editors: Kenneth R. Feingold and Peter Elias.
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Affiliation(s)
- Franz P W Radner
- Institute for Human Genetics, University Medical Center Freiburg, Freiburg 79106, Germany.
| | - Judith Fischer
- Institute for Human Genetics, University Medical Center Freiburg, Freiburg 79106, Germany
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200
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du Plessis J, Stefaniak A, Eloff F, John S, Agner T, Chou TC, Nixon R, Steiner M, Franken A, Kudla I, Holness L. International guidelines for the in vivo assessment of skin properties in non-clinical settings: Part 2. transepidermal water loss and skin hydration. Skin Res Technol 2013; 19:265-78. [PMID: 23331328 PMCID: PMC4522909 DOI: 10.1111/srt.12037] [Citation(s) in RCA: 153] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/10/2012] [Indexed: 01/22/2023]
Abstract
BACKGROUND There is an emerging perspective that it is not sufficient to just assess skin exposure to physical and chemical stressors in workplaces, but that it is also important to assess the condition, i.e. skin barrier function of the exposed skin at the time of exposure. The workplace environment, representing a non-clinical environment, can be highly variable and difficult to control, thereby presenting unique measurement challenges not typically encountered in clinical settings. METHODS An expert working group convened a workshop as part of the 5th International Conference on Occupational and Environmental Exposure of Skin to Chemicals (OEESC) to develop basic guidelines and best practices (based on existing clinical guidelines, published data, and own experiences) for the in vivo measurement of transepidermal water loss (TEWL) and skin hydration in non-clinical settings with specific reference to the workplace as a worst-case scenario. RESULTS Key elements of these guidelines are: (i) to minimize or recognize, to the extent feasible, the influences of relevant endogenous-, exogenous-, environmental- and measurement/instrumentation-related factors; (ii) to measure TEWL with a closed-chamber type instrument; (iii) report results as a difference or percent change (rather than absolute values); and (iv) accurately report any notable deviations from this guidelines. CONCLUSION It is anticipated that these guidelines will promote consistent data reporting, which will facilitate inter-comparison of study results.
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Affiliation(s)
- Johan du Plessis
- School for Physiology, Nutrition and Consumer Sciences, North-West University, Potchefstroom, North-West province 2520, South Africa.
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