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Human skin substitute

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https://www.readbyqxmd.com/read/29208214/proof-of-concept-of-a-new-autologous-skin-substitute-for-the-treatment-of-deep-wounds-in-dogs
#1
L Ramió-Lluch, S Cerrato, P Brazis, R M Rabanal, D Fondevila, A Puigdemont
Autologous skin grafts are effective for the repair of large skin wounds, but the availability of large amounts of skin is often limited. Through bioengineering, several autologous skin substitutes have been developed for use in human clinical practice. However, few skin substitutes are available for use in animals. The aim of this study was to develop and assess an engineered autologous skin substitute for the treatment of deep wounds in veterinary medicine. Canine keratinocytes and fibroblasts were isolated after double enzyme digestion from 8mm punch biopsies from four healthy Beagle dogs...
December 2017: Veterinary Journal
https://www.readbyqxmd.com/read/29207659/2-3-4-dihydroxybenzylidene-malononitrile-as-a-novel-anti-melanogenic-compound
#2
Bonggi Lee, Kyoung Mi Moon, Jong Seung Lim, Yeojin Park, Do Hyun Kim, Sujin Son, Hyoung Oh Jeong, Dae Hyun Kim, Eun Kyeong Lee, Ki Wung Chung, Hye Jin An, Pusoon Chun, Arnold Y Seo, Ju-Hye Yang, Bong-Seon Lee, Jin Yeul Ma, Won-Kyung Cho, Hyung Ryong Moon, Hae Young Chung
Tyrosinase is a key player in ultraviolet-induced melanogenesis. Because excessive melanin accumulation in the skin can induce hyperpigmentation, the development of tyrosinase inhibitors has attracted attention in cosmetic-related fields. However, side effects including toxicity and low selectivity have limited the use of many tyrosinase inhibitors in cosmetics. We synthesized 12 novel 2-(substituted benzylidene)malononitrile derivatives and investigated their anti-melanogenic activities. Of these 12 compounds, 2-(3, 4-dihydroxy benzylidene)malononitrile (BMN11) exhibited the strongest inhibitory activity against tyrosinase (IC50 = 17...
October 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/29207342/accelerated-skin-wound-healing-by-selective-11%C3%AE-hydroxylase-cyp11b1-inhibitors
#3
Juliette Emmerich, Chris J van Koppen, Jens L Burkhart, Roger T Engeli, Qingzhong Hu, Alex Odermatt, Rolf W Hartmann
Previous studies have shown that inhibition of cortisol biosynthesis in skin leads to accelerated wound healing. Here, pyridylmethyl pyridine type 11β-hydroxylase (CYP11B1) inhibitors were optimized for topical application to avoid systemic side effects. The resulting very potent, non-toxic CYP11B1 inhibitor 14 (IC50 = 0.8 nM) exhibited good selectivity over 11β-HSD1, CYP17A1 and CYP19A1. The compound showed high stability toward human plasma (t1/2= > 150 min, as a substitute for wound fluid) and low stability toward HLS9 (t1/2 = 19 min) for rapid metabolic clearance after absorption...
November 21, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29201599/combining-adoptive-treg-transfer-with-bone-marrow-transplantation-for-transplantation-tolerance
#4
REVIEW
Nina Pilat, Nicolas Granofszky, Thomas Wekerle
Purpose of Review: The mixed chimerism approach is an exceptionally potent strategy for the induction of donor-specific tolerance in organ transplantation and so far the only one that was demonstrated to work in the clinical setting. Regulatory T cells (Tregs) have been shown to improve chimerism induction in experimental animal models. This review summarizes the development of innovative BMT protocols using therapeutic Treg transfer for tolerance induction. Recent Findings: Treg cell therapy promotes BM engraftment in reduced conditioning protocols in both, mice and non-human primates...
2017: Current Transplantation Reports
https://www.readbyqxmd.com/read/29179286/-decolorization-of-skin-and-hair-derived-melanin-by-three-ligninolytic-enzymes
#5
F Miao, T C Lei, M Y Su, W J Yi, S Jiang, S Z Xu
Objective: To compare the decolorization efficiency of lignin peroxidase (LiP), manganese peroxidase (MnP) and laccase on eumelanin and pheomelanin, and to investigate the effect of topical administration of LiP solution on hyperpigmented guinea pigs skin induced by 308 nm excimer light. Methods: Pheomelanin-enriched specimens were prepared from human hair and cutaneous melanoma tissue using alkaline lysis method.Synthetic eumelanin was purchased from a commercial supplier.The same amount (0.02%) of melanin was incubated with the equal enzyme activity (0...
November 21, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29164209/tuning-the-cytotoxicity-of-ruthenium-ii-para-cymene-complexes-by-mono-substitution-at-a-triphenylphosphine-phenoxydiphenylphosphine-ligand
#6
Lorenzo Biancalana, Stefano Zacchini, Nicola Ferri, Maria Giovanna Lupo, Guido Pampaloni, Fabio Marchetti
The new complexes [RuCl2(η(6)-p-cymene)(κP-Ph2PR)] [R = 4-C6H4OSiMe2(t)Bu, 1; R = 4-C6H4Br, 2; R = OC([double bond, length as m-dash]O)CHCl2, 3; R = OPh, 4; R = O(2-C6H4SiMe2(t)Bu), 5] and [Ru(C2O4)(η(6)-p-cymene){κP-Ph2PO(2-C6H4(SiMe2(t)Bu))}], 6, were obtained in 83-98% yield from Ru(ii) arene precursors by three different synthetic strategies. The unprecedented phosphine Ph2P(O(2-C6H4SiMe2(t)Bu)) was synthesized in 86% yield from 2-C6H4Br(OSiMe2(t)Bu) and Ph2PCl, via intramolecular oxygen to carbon 1,3 migration of the silyl group (retro-Brook rearrangement)...
November 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29162533/derivation-of-an-oral-reference-dose-rfd-for-di-2-ethylhexyl-cyclohexan-1-4-dicarboxylate-dehch-an-alternative-to-phthalate-plasticizers
#7
Brian J Hughes, Kevin Cox, Virunya Bhat
Di 2-ethylhexyl cyclohexane-1,4-dicarboxylate (DEHCH, CAS 84731-70-4) is an ester of polycarboxylic acid assessed in a wide variety of ecotoxicological and mammalian toxicity assays as a substitute for phthalate ester-type plasticizers. Laboratory animal data indicate that DEHCH has a low acute oral and dermal toxicity, is non-irritating to the skin and eyes, and is a non-sensitizer. In an OECD 422 combined repeat dose toxicity study with a reproductive/developmental toxicity screening test in Sprague-Dawley rats, minimal effects were observed on the liver, spleen, and thyroid...
November 18, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29124983/comparative-toxicological-evaluation-of-nonylphenol-and-nonylphenol-polyethoxylates-using-human-keratinocytes
#8
Hyungjoo Kim, Sunhwa Oh, Myung Chan Gye, Incheol Shin
Nonylphenol polyethoxylates (NPEOs) are a major group of nonionic surfactants widely used in various detergents, cleaners, plastics, papers, and agro-chemical products. Nonylphenol (NP), which is a final degraded metabolite derived from NPEOs, has been reported as an endocrine disrupter, known to mimic or disturb reproductive hormone functions. Concern about the hazards of NP and NPEOs has generated legal restrictions and action plans worldwide. Considering the fact that NP and NPEOs are majorly used in the production of products such as detergents, shampoos, and cosmetics which frequently come into contact with the skin, we investigated the effects of NP and NPEOs on a human keratinocyte cell line (HaCaT)...
November 10, 2017: Drug and Chemical Toxicology
https://www.readbyqxmd.com/read/29124400/characterization-of-m1-and-m2-polarization-of-macrophages-in-vascularized-human-dermo-epidermal-skin-substitutes-in-vivo
#9
Agnes S Klar, Katarzyna Michalak-Mićka, Thomas Biedermann, Claudia Simmen-Meuli, Ernst Reichmann, Martin Meuli
AIMS AND OBJECTIVES: Vascularized bio-engineered human dermo-epidermal skin substitutes (vascDESS) hold promise for treating burn patients, including those with severe full-thickness wounds. We have previously shown that vascDESS promote wound healing by enhanced influx of macrophages and granulocytes. Immediately following transplantation, macrophages infiltrate the graft and differentiate into a pro-inflammatory (M1) or a pro-healing M2 phenotype. The aim of this study was to characterize the activation state of macrophages infiltrating skin transplants at distinct time points following transplantation...
November 9, 2017: Pediatric Surgery International
https://www.readbyqxmd.com/read/29115054/comparison-of-human-umbilical-cord-blood-derived-mesenchymal-stem-cells-with-healthy-fibroblasts-on-wound-healing-activity-of-diabetic-fibroblasts
#10
Jae-A Jung, Young-Don Yoon, Hyup-Woo Lee, So-Ra Kang, Seung-Kyu Han
Various types of skin substitutes composed of fibroblasts and/or keratinocytes have been used for the treatment of diabetic ulcers. However, the effects have generally not been very dramatic. Recently, human umbilical cord blood-derived mesenchymal stromal cells (hUCB-MSCs) have been commercialised for cartilage repair as a first cell therapy product using allogeneic stem cells. In a previous pilot study, we reported that hUCB-MSCs have a superior wound-healing capability compared with fibroblasts. The present study was designed to compare the treatment effect of hUCB-MSCs with that of fibroblasts on the diabetic wound healing in vitro...
November 7, 2017: International Wound Journal
https://www.readbyqxmd.com/read/29106911/stem-cells-niches-and-scaffolds-applications-to-burns-and-wound-care
#11
Suzanne M Watt, Jonathan M Pleat
The importance of skin to survival, and the devastating physical and psychological consequences of scarring following reparative healing of extensive or difficult to heal human wounds, cannot be disputed. We discuss the significant challenges faced by patients and healthcare providers alike in treating these wounds. New state of the art technologies have provided remarkable insights into the role of skin stem and progenitor cells and their niches in maintaining skin homeostasis and in reparative wound healing...
October 26, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/29094203/creation-of-miniature-pig-model-of-human-waardenburg-syndrome-type-2a-by-enu-mutagenesis
#12
Tang Hai, Weiwei Guo, Jing Yao, Chunwei Cao, Ailing Luo, Meng Qi, Xianlong Wang, Xiao Wang, Jiaojiao Huang, Ying Zhang, Hongyong Zhang, Dayu Wang, Haitao Shang, Qianlong Hong, Rui Zhang, Qitao Jia, Qiantao Zheng, Guosong Qin, Yongshun Li, Tao Zhang, Weiwu Jin, Zheng-Yi Chen, Hongmei Wang, Qi Zhou, Anming Meng, Hong Wei, Shiming Yang, Jianguo Zhao
Human Waardenburg syndrome 2A (WS2A) is a dominant hearing loss (HL) syndrome caused by mutations in the microphthalmia-associated transcription factor (MITF) gene. In mouse models with MITF mutations, WS2A is transmitted in a recessive pattern, which limits the study of hearing loss (HL) pathology. In the current study, we performed ENU (ethylnitrosourea) mutagenesis that resulted in substituting a conserved lysine with a serine (p. L247S) in the DNA-binding domain of the MITF gene to generate a novel miniature pig model of WS2A...
November 1, 2017: Human Genetics
https://www.readbyqxmd.com/read/29075641/expression-of-c4-4a-in-an-in-vitro-human-tissue-engineered-skin-model
#13
Benedikte Jacobsen, Danielle Larouche, Olivier Rochette-Drouin, Michael Ploug, Lucie Germain
A multi-LU-domain-containing protein denoted C4.4A exhibits a tightly regulated membrane-associated expression in the suprabasal layers of stratified squamous epithelia such as skin and the esophagus, and the expression of C4.4A is dysregulated in various pathological conditions. However, the biological function of C4.4A remains unknown. To enable further studies, we evaluated the expression of C4.4A in monolayer cultures of normal human keratinocytes and in tissue-engineered skin substitutes (TESs) produced by the self-assembly approach, which allow the formation of a fully differentiated epidermis tissue...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29046476/tracking-mesenchymal-stem-cell-contributions-to-regeneration-in-an-immunocompetent-cartilage-regeneration-model
#14
Daniela Zwolanek, María Satué, Verena Proell, José R Godoy, Kathrin I Odörfer, Magdalena Flicker, Sigrid C Hoffmann, Thomas Rülicke, Reinhold G Erben
It is currently controversially discussed whether mesenchymal stem cells (MSC) facilitate cartilage regeneration in vivo by a progenitor- or a nonprogenitor-mediated mechanism. Here, we describe a potentially novel unbiased in vivo cell tracking system based on transgenic donor and corresponding immunocompetent marker-tolerant recipient mouse and rat lines in inbred genetic backgrounds. Tolerance of recipients was achieved by transgenic expression of an immunologically neutral but physicochemically distinguishable variant of the marker human placental alkaline phosphatase (ALPP)...
October 19, 2017: JCI Insight
https://www.readbyqxmd.com/read/29039047/the-expression-pattern-of-keratin-24-in-tissue-engineered-dermo-epidermal-human-skin-substitutes-in-an-in-vivo-model
#15
Agnes S Klar, Katarzyna Michalak, Sophie Böttcher-Haberzeth, Ernst Reichmann, Martin Meuli, Thomas Biedermann
AIMS AND OBJECTIVES: The use of autologous tissue-engineered skin substitutes is a promising approach to cover large skin defects in patients. Preclinical investigation is pivotal to test and improve the quality of these bio-engineered substitutes. In the skin, the epidermis, formed mainly by keratinocytes, provides the first physical barrier protecting from the environment. Proper keratinocyte differentiation and, thus, formation of a stratified epidermis is essential for this function...
October 16, 2017: Pediatric Surgery International
https://www.readbyqxmd.com/read/29030192/polyvinyl-alcohol-sodium-alginate-integrated-silver-nanoparticles-as-probable-solution-for-decontamination-of-microbes-contaminated-water
#16
M A Abu-Saied, Tarek H Taha, Nehal M El-Deeb, Elsayed E Hafez
It is well known that the pathogenic multidrug resistant microbes are highly distributed and transferred to human through contaminated food and water. Advanced technologies have been developed for controlling these microbes using synthesized nanoparticles. In this study, biosynthesized silver nanoparticles were prepared, characterized and integrated with two synthetic and natural polymers. The polymers-silver nanoparticles were characterized using SEM, FTIR and mechanical properties of the membrane synthesized from either polymers with/without nanosilver...
October 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29026645/synthesis-and-characterization-of-collagen-plga-biodegradable-skin-scaffold-fibers
#17
Alireza Sadeghi-Avalshahr, Samira Nokhasteh, Amir Mahdi Molavi, Mohammad Khorsand-Ghayeni, Meysam Mahdavi-Shahri
The aim of this study is to investigate the applicability of poly(lactic-co-glycolic acid) (PLGA)/collagen composite scaffold for skin tissue engineering. PLGA and collagen were dissolved in HFIP as a common solvent and fibrous scaffolds were prepared by electrospinning method. The scaffolds were characterized by scanning electron microscopy (SEM), FTIR spectroscopy, mercury porosimetry, tensile strength, biocompatibility assays and Biodegradation. Cytotoxicity and cell adhesion were tested for two cell line groups, human dermal fibroblast (HDF) and human keratinocyte (HaCat)...
October 2017: Regenerative Biomaterials
https://www.readbyqxmd.com/read/28983270/intranasal-oxytocin-treatment-increases-eye-gaze-behavior-toward-the-owner-in-ancient-japanese-dog-breeds
#18
Miho Nagasawa, Misato Ogawa, Kazutaka Mogi, Takefumi Kikusui
Dogs acquired unique cognitive abilities during domestication, which is thought to have contributed to the formation of the human-dog bond. In European breeds, but not in wolves, a dog's gazing behavior plays an important role in affiliative interactions with humans and stimulates oxytocin secretion in both humans and dogs, which suggests that this interspecies oxytocin and gaze-mediated bonding was also acquired during domestication. In this study, we investigated whether Japanese breeds, which are classified as ancient breeds and are relatively close to wolves genetically, establish a bond with their owners through gazing behavior...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28958837/investigation-of-dermal-toxicity-of-ionic-liquids-in-monolayer-cultured-skin-cells-and-3d-reconstructed-human-skin-models
#19
Jee-Hyun Hwang, Hyeonji Park, Dal Woong Choi, Ki Taek Nam, Kyung-Min Lim
Ionic liquids have gained increasing attention in the chemical industry as potential green substitutes for traditional solvents. However, little is known about toxicity of ionic liquids on the skin, a major exposure portal to toxic substances. Here, we evaluated dermal toxicity of ionic liquids using human keratinocyte and fibroblast cell line, 3D reconstructed human epidermis, and full-thickness model to investigate underlying mechanisms. Cytotoxicity of ionic liquids was evaluated for representative anions, [TFSI], [PF6], [BF4], and [DCA], as well as for cations, [EMIM], [BMPY], [TBA] and [Zn], in human keratinocyte cell line, HaCaT, and human dermal fibroblasts...
September 25, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28955966/a-3d-psoriatic-skin-model-for-dermatological-testing-the-impact-of-culture-conditions
#20
Alexandra Duque-Fernandez, Lydia Gauthier, Mélissa Simard, Jessica Jean, Isabelle Gendreau, Alexandre Morin, Jacques Soucy, Michèle Auger, Roxane Pouliot
BACKGROUND: Inadequate representation of the human tissue environment during a preclinical screen can result in inaccurate predictions of compound effects. Consequently, pharmaceutical investigators are searching for preclinical models that closely resemble original tissue for predicting clinical outcomes. METHODS: The current research aims to compare the impact of using serum-free medium instead of complete culture medium during the last step of psoriatic skin substitute reconstruction...
December 2016: Biochemistry and Biophysics Reports
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