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Human skin substitute

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https://www.readbyqxmd.com/read/29664544/human-skin-model-for-mimic-dermal-studies-in-pathology-with-a-clinical-implication-in-pressure-ulcers
#1
Lara Cristóbal, Miguel A Ortega, Ángel Asúnsolo, Beatriz Romero, Melchor Álvarez-Mon, Julia Buján, Andrés A Maldonado, Natalio García-Honduvilla
Despite advances in regenerative medicine and tissue engineering, human skin substitutes remain a clear goal to achieve. Autografts remain the principal clinical option. The long-term changes in dermis, as well as its response after injuries, are not well known. Research in this field has been hindered by a lack of experimental animal models. This study analyzes the architectural dermal scaffold (collagen and elastin fibers plus fibrillin-microfibrils) changes in a model of human skin pressure ulcers in mice...
April 17, 2018: Histology and Histopathology
https://www.readbyqxmd.com/read/29649587/a-novel-tool-against-multiresistant-bacterial-pathogens-lipopeptide-modification-of-the-natural-antimicrobial-peptide-ranalexin-for-enhanced-antimicrobial-activity-and-improved-pharmacokinetics
#2
Cornelius Domhan, Philipp Uhl, Anna Meinhardt, Stefan Zimmermann, Christian Kleist, Thomas Lindner, Karin Leotta, Walter Mier, Michael Wink
As evolutionary optimized defense compounds, antimicrobial peptides (AMPs) represent a powerful tool against bacterial infections. Ranalexin, an AMP found in the skin of the American bullfrog (Rana catesbeiana), is primarily active against Gram-positive bacteria with a minimum inhibitory concentration (MIC) of 8 - 16 mg/L but shows weaker activity against Gram-negative bacteria (> 64 mg/L). By substitution of 6 N-terminal amino acids by decanoic (C10:0) to myristic (C14:0) acid, we were able to develop lipopeptide derivatives with enhanced antimicrobial activity...
April 9, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29643444/a-bowman-birk-type-chymotrypsin-inhibitor-peptide-from-the-amphibian-hylarana-erythraea
#3
Luyao Zhang, Xiaoling Chen, Yue Wu, Mei Zhou, Chengbang Ma, Xinping Xi, Tianbao Chen, Brian Walker, Chris Shaw, Lei Wang
The first amphibian skin secretion-derived Bowman-Birk type chymotrypsin inhibitor is described here from the Asian green frog, Hylarana erythraea, and was identified by use of molecular cloning and tandem mass spectrometric amino acid sequencing. It was named Hylarana erythraea chymotrypsin inhibitor (HECI) and in addition to inhibition of chymotrypsin (Ki = 3.92 ± 0.35 μM), the peptide also inhibited the 20 S proteasome (Ki = 8.55 ± 1.84  μM). Additionally, an analogue of HECI, named K9 -HECI, in which Phe9 was substituted by Lys9 at the P1 position, was functional as a trypsin inhibitor...
April 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29624184/self-powered-vision-electronic-skin-basing-on-piezo-photodetecting-ppy-pvdf-pixel-patterned-matrix-for-mimicking-vision
#4
Wuxiao Han, Linlin Zhang, Haoxuan He, Hongmin Liu, Lili Xing, Xinyu Xue
The development of multifunctional electronic-skin that establishes human-machine interfaces, enhances perception abilities or has other distinct biomedical applications is the key to the realization of artificial intelligence. In this paper, a new self-powered (battery-free) flexible vision electronic-skin has been realized from pixel-patterned matrix of piezo-photodetecting PVDF/Ppy film. The electronic-skin under applied deformation can actively output piezoelectric voltage, and the outputting signal can be significantly influenced by UV illumination...
April 6, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29593035/a-highly-conserved-leucine-in-mammarenavirus-matrix-z-protein-is-required-for-z-interaction-with-the-virus-l-polymerase-and-z-stability-in-cells-harboring-an-active-viral-ribonucleoprotein
#5
Masaharu Iwasaki, Juan C de la Torre
Mammarenaviruses cause chronic infections in their natural rodent hosts. Infected rodents shed infectious virus into excreta. Humans are infected through mucosal exposure to aerosols or direct contact of abraded skin with fomites, resulting in a wide-range of manifestations from asymptomatic or mild febrile illness to severe life-threatening hemorrhagic fever. The mammarenavirus matrix Z protein has been shown to be a main driving force of virus budding and to act as a negative regulator of viral RNA synthesis...
March 28, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29589541/antimicrobial-peptides-in-human-disease-therapeutic-approaches-second-of-two-parts
#6
Thea Magrone, Matteo Antonio Russo, Emilio Jirillo
Antimicrobial peptides (AMPs) are produced by a variety of human immune and nonimmune cells in health and disease. In virtue of their antimicrobial activity, AMPs have been exploited in human disease and here this aspect will extensively be described. AMPs in comparison to antibiotics possess a larger spectrum of antimicrobial activity without inducing microbial resistance. Therefore, their use in the course of antibiotic-resistant infections is justified. AMP activity in early life, in the airways, in the oral and gastro-enteric system, in the skin and in the female reproductive tract, respectively, will be elucidated...
March 27, 2018: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29551664/type-iii-collagen-affects-dermal-and-vascular-collagen-fibrillogenesis-and-tissue-integrity-in-a-mutant-col3a1-transgenic-mouse-model
#7
Sanne D'hondt, Brecht Guillemyn, Delfien Syx, Sofie Symoens, Riet De Rycke, Leen Vanhoutte, Wendy Toussaint, Bart N Lambrecht, Anne De Paepe, Douglas R Keene, Yoshihiro Ishikawa, Hans Peter Bächinger, Sophie Janssens, Mathieu J M Bertrand, Fransiska Malfait
Type III collagen is a major fibrillar collagen consisting of three identical α1 (III)-chains that is particularly present in tissues exhibiting elastic properties, such as the skin and the arterial wall. Heterozygous mutations in the COL3A1 gene result in vascular Ehlers-Danlos syndrome (vEDS), a severe, life-threatening disorder, characterized by thin, translucent skin and propensity to arterial, intestinal and uterine rupture. Most human vEDS cases result from a missense mutation substituting a crucial glycine residue in the triple helical domain of the α1 (III)-chains...
March 15, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29529861/3d-protein-based-bilayer-artificial-skin-for-guided-scarless-healing-of-3rd-degree-burn-wounds-in-vivo
#8
Mazaher Gholipourmalekabadi, Alexander M Seifalian, Aleksandra M Urbanska, Mir Davood Omrani, John G Hardy, Zahra Madjd, Seyed Mahmoud Hashemi, Hossein Ghanbarian, Peiman Brouki Milan, Masoud Mozafari, Rui L Reis, Subhas C Kundu, Ali Samadikuchaksaraei
Severe burn injuries can lead to delay in healing and devastating scar formation. Attempts are made to develop a suitable skin substitute for scarless healing of such skin wounds. Currently, there is no effective strategy yet for a complete scarless healing after the thermal injuries. In our recent work we fabricate and evaluated a 3D protein-based artificial skin made from decellularized human amniotic membrane (AM) and electrospun nanofibrous silk fibroin (ESF) in vitro. We also characterize both biophysical and cell culture investigation to establish in vitro performance of the developed bilayer scaffolds...
March 12, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29529471/sterically-modulated-silver-i-complexes-of-coumarin-substituted-benzimidazol-2-ylidenes-synthesis-crystal-structures-and-evaluation-of-their-antimicrobial-and-antilung-cancer-potentials
#9
Gautam Achar, C R Shahini, Siddappa A Patil, Jan Grzegorz Małecki, Szu-Hua Pan, Albert Lan, Xuan-Ren Chen, Srinivasa Budagumpi
In this contribution, a series of sterically-encumbered coumarin substituted benzimidazole-based N-heterocyclic carbene (NHC) precursors (1-12) and their silver(I)-NHC complexes (13-24) are reported. Molecular structure of NHC precursors 8 and 12 and cationic complexes 15 and 16 was established by single crystal X-ray diffraction method. The silver(I) complexes demonstrated various significant intramolecular agostic-like interactions operating between the metal center and the hydrogen atoms of the substituents alongside a variety of feeble π-π stacking interactions...
February 22, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29477356/simultaneous-controlled-iontophoretic-delivery-of-pramipexole-and-rasagiline-in-vitro-and-in-vivo-transdermal-polypharmacy-to-treat-parkinson-s-disease
#10
Dhaval R Kalaria, Mayank Singhal, Vandana Patravale, Virginia Merino, Yogeshvar N Kalia
Effective treatment of Parkinson's disease (PD) involves administration of therapeutic agents with complementary mechanisms of action in order to replenish, sustain or substitute endogenous dopamine. The objective of this study was to investigate anodal co-iontophoresis of pramipexole (PRAM; dopamine agonist) and rasagiline (RAS; MAO-B inhibitor) in vitro and in vivo. Passive permeation of PRAM and RAS (20 mM each) across porcine skin after 6 h was 15.7±1.9 and 16.0±2.9 µg/cm2 , respectively. Co-iontophoresis at 0...
February 22, 2018: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29400411/design-synthesis-and-biological-evaluation-of-novel-1-2-diaryl-4-substituted-benzylidene-5-4h-imidazolone-derivatives-as-cytotoxic-agents-and-cox-2-lox-inhibitors
#11
Phoebe F Lamie, John N Philoppes, Lucie Rárová
A new series of 1,2-diaryl-4-substituted-benzylidene-5(4H)-imidazolone derivatives 4a-l was synthesized. Their structures were confirmed by different spectroscopic techniques (IR, 1 H NMR, DEPT-Q NMR, and mass spectroscopy) and elemental analyses. Their cytotoxic activities in vitro were evaluated against breast, ovarian, and liver cancer cell lines and also normal human skin fibroblasts. Cyclooxygenase (COX)-1, COX-2 and lipoxygenase (LOX) inhibitory activities were measured. The synthesized compounds showed selectivity toward COX-2 rather than COX-1, and the IC50 values (0...
February 5, 2018: Archiv der Pharmazie
https://www.readbyqxmd.com/read/29386409/enhancement-of-wound-healing-efficiency-mediated-by-artificial-dermis-functionalized-with-egf-or-nrg1
#12
Dogeon Yoon, Dajeong Yoon, Hyuk-Jin Cha, Ji-Seon Lee, Wook Chun
The use of artificial dermis as a skin substitute represents a field of active study, as acellular dermal matrices from cadavers are susceptible to infection owing to their human origin. One such alternative dermal replacement scaffold, INSUREGRAF®, is derived primarily from extracellular matrix proteins such as collagen and elastin and has been clinically used to treat severe skin wounds such as burns. This scaffold has proven to be useful to minimize wound contraction and scar formation owing to its biocompatibility, interconnected pore structure, sufficient biodegradability, and suitable mechanical properties...
February 1, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29366943/membrane-properties-for-permeability-testing-skin-versus-synthetic-membranes
#13
Anika Haq, Mania Dorrani, Benjamin Goodyear, Vivek Joshi, Bozena Michniak-Kohn
Synthetic membranes that are utilized in diffusion studies for topical and transdermal formulations are usually porous thin polymeric sheets for example cellulose acetate (CA) and polysulfones. In this study, the permeability of human skin was compared using two synthetic membranes: cellulose acetate and Strat-M® membrane and lipophilic and hydrophilic compounds either as saturated or formulated solutions as well as marketed dosage forms. Our data suggests that hydrophilic compounds have higher permeation in Strat-M membranes compared with lipophilic ones...
January 20, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29342076/neuromorphic-vibrotactile-stimulation-of-fingertips-for-encoding-object-stiffness-in-telepresence-sensory-substitution-and-augmentation-applications
#14
Francesca Sorgini, Luca Massari, Jessica D'Abbraccio, Eduardo Palermo, Arianna Menciassi, Petar B Petrovic, Alberto Mazzoni, Maria Chiara Carrozza, Fiona N Newell, Calogero M Oddo
We present a tactile telepresence system for real-time transmission of information about object stiffness to the human fingertips. Experimental tests were performed across two laboratories (Italy and Ireland). In the Italian laboratory, a mechatronic sensing platform indented different rubber samples. Information about rubber stiffness was converted into on-off events using a neuronal spiking model and sent to a vibrotactile glove in the Irish laboratory. Participants discriminated the variation of the stiffness of stimuli according to a two-alternative forced choice protocol...
January 17, 2018: Sensors
https://www.readbyqxmd.com/read/29337163/utility-of-ultra-deep-sequencing-for-detection-of-varicella-zoster-virus-antiviral-resistance-mutations
#15
Mélanie Mercier-Darty, David Boutolleau, Raphaël Lepeule, Christophe Rodriguez, Sonia Burrel
We report the first application of ultra-deep sequencing (UDS) to varicella-zoster virus (VZV) genotypic antiviral testing in a case of acyclovir-resistant VZV infection initially detected by Sanger sequencing within a deeply immunocompromised heart transplant recipient. As added-value compared to Sanger analysis, UDS revealed complex dynamics of viral population under antiviral pressure. Varicella-zoster virus (VZV) is a ubiquitous human herpesvirus affecting populations worldwide. VZV is commonly acquired in youth whose primary infection usually manifests as benign varicella (chickenpox)...
March 2018: Antiviral Research
https://www.readbyqxmd.com/read/29316315/scarless-wound-healing-transitioning-from-fetal-research-to-regenerative-healing
#16
REVIEW
Alessandra L Moore, Clement D Marshall, Leandra A Barnes, Matthew P Murphy, Ryan C Ransom, Michael T Longaker
Since the discovery of scarless fetal skin wound healing, research in the field has expanded significantly with the hopes of advancing the finding to adult human patients. There are several differences between fetal and adult skin that have been exploited to facilitate scarless healing in adults including growth factors, cytokines, and extracellular matrix substitutes. However, no one therapy, pathway, or cell subtype is sufficient to support scarless wound healing in adult skin. More recently, products that contain or mimic fetal and adult uninjured dermis were introduced to the wound healing market with promising clinical outcomes...
March 2018: Wiley Interdisciplinary Reviews. Developmental Biology
https://www.readbyqxmd.com/read/29313702/a-comparison-of-scaffold-free-and-scaffold-based-reconstructed-human-skin-models-as-alternatives-to-animal-use
#17
COMPARATIVE STUDY
Beste Kinikoglu
Tissue engineered full-thickness human skin substitutes have various applications in the clinic and in the laboratory, such as in the treatment of burns or deep skin defects, and as reconstructed human skin models in the safety testing of drugs and cosmetics and in the fundamental study of skin biology and pathology. So far, different approaches have been proposed for the generation of reconstructed skin, each with its own advantages and disadvantages. Here, the classic tissue engineering approach, based on cell-seeded polymeric scaffolds, is compared with the less-studied cell self-assembly approach, where the cells are coaxed to synthesise their own extracellular matrix (ECM)...
December 2017: Alternatives to Laboratory Animals: ATLA
https://www.readbyqxmd.com/read/29208214/proof-of-concept-of-a-new-autologous-skin-substitute-for-the-treatment-of-deep-wounds-in-dogs
#18
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
#19
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
#20
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...
January 1, 2018: European Journal of Medicinal Chemistry
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