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https://www.readbyqxmd.com/read/28651246/development-of-a-perfusion-platform-for-dynamic-cultivation-of-in-vitro-skin-models
#1
Kay Strüver, Wolfgang Friess, Sarah Hedtrich
Reconstructed skin models are suitable test systems for toxicity testing and for basic investigations on (patho-)physiological aspects of human skin. Reconstructed human skin, however, has clear limitations such as the lack of immune cells and a significantly weaker skin barrier function compared to native human skin. Potential reasons for the latter might be the lack of mechanical forces during skin model cultivation which is performed classically in static well-plate setups. Mechanical forces and shear stress have a major impact on tissue formation and, hence, tissue engineering...
June 27, 2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28638981/use-of-systemic-glucocorticoids-and-the-risk-of-major-osteoporotic-fractures-in-patients-with-sarcoidosis
#2
O A Oshagbemi, J H M Driessen, A Pieffers, E F M Wouters, P Geusens, P Vestergaard, J van den Bergh, F M E Franssen, F de Vries
This study revealed the risk of major osteoporotic fracture in patients with sarcoidosis exposed to glucocorticoids. Current use of glucocorticoids was associated with a risk of fracture, with no difference between patients with and without sarcoidosis. Sarcoidosis per se was not associated with an increased fracture risk. INTRODUCTION: Sarcoidosis is a multi-organ, chronic inflammatory, granulomatous disorder that most frequently affects the lungs, lymph nodes, skin, eyes, and liver, but may occur in any organ, including the bones...
June 21, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28636805/a-hybrid-phantom-system-for-patient-skin-and-organ-dosimetry-in-fluoroscopically-guided-interventions
#3
David Borrego, Daniel Siragusa, Stephen Balter, Wesley E Bolch
To investigate calibrations for improved estimates of skin dose and to develop software for computing absorbed organ doses for fluoroscopically guided interventions (FGIs) with the use of radiation dose structured reports (RDSR) and the UF/NCI family of hybrid computational phantoms METHODS AND MATERIALS: Institutional review board approval was obtained for this retrospective study in which ten RDSRs were selected for their high cumulative reference air kerma values. Skin doses were computed using the University of Florida's rapid in-clinic peak skin dose algorithm (or UF-RIPSA)...
June 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28630487/multicolor-two-photon-imaging-of-endogenous-fluorophores-in-living-tissues-by-wavelength-mixing
#4
Chiara Stringari, Lamiae Abdeladim, Guy Malkinson, Pierre Mahou, Xavier Solinas, Isabelle Lamarre, Sébastien Brizion, Jean-Baptiste Galey, Willy Supatto, Renaud Legouis, Ana-Maria Pena, Emmanuel Beaurepaire
Two-photon imaging of endogenous fluorescence can provide physiological and metabolic information from intact tissues. However, simultaneous imaging of multiple intrinsic fluorophores, such as nicotinamide adenine dinucleotide(phosphate) (NAD(P)H), flavin adenine dinucleotide (FAD) and retinoids in living systems is generally hampered by sequential multi-wavelength excitation resulting in motion artifacts. Here, we report on efficient and simultaneous multicolor two-photon excitation of endogenous fluorophores with absorption spectra spanning the 750-1040 nm range, using wavelength mixing...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28628678/assessment-of-efficacy-and-irritation-of-ingenol-mebutate-gel-0-015-used-with-or-without-dimethicone-lotion-for-treatment-of-actinic-keratosis-on-the-face
#5
Shelbi C Jim On, Peter W Hashim, John K Nia, Mark G Lebwohl
<p>Background: Ingenol mebutate gel 0.015% provides high clearance rates for actinic keratosis (AK) on the face and scalp but causes transient local skin responses (LSRs).</p> <p>Objective: This study sought to determine whether the application of 1% dimethicone would decrease ingenol mebutate-associated LSRs and/or affect efficacy during the treatment of multiple AKs on the face.</p> <p>Methods: Ingenol mebutate gel 0.015% was applied for 3 days to two 25 cm2 areas, each containing 3 to 8 AKs on the face of each subject, followed by application of 1% dimethicone lotion in an investigator-blinded manner to one randomly selected AK-containing area until LSRs were no longer present...
May 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28627081/arginase-2-a-mir-1299-target-enhances-pigmentation-in-melasma-by-reducing-melanosome-degradation-via-senescence-induced-autophagy-inhibition
#6
Nan-Hyung Kim, Soo-Hyun Choi, Nayoung Yi, Tae Ryong Lee, Ai-Young Lee
Expression profiles revealed miR-1299 downregulation concomitant with arginase-2 (ARG2) upregulation in hyperpigmented skin of melasma patients. Opposite regulation of tyrosinase and PMEL17 by miR-1299 and inverse relationship between miR-1299 and ARG2 expression denoted a role of miR-1299 in pigmentation with ARG2 as a miR-1299 target. ARG2 overexpression or knockdown in keratinocytes, the main source of ARG2 in epidermis, positively regulated tyrosinase and PMEL17 protein levels, but not mRNA levels or melanosome transfer...
June 19, 2017: Pigment Cell & Melanoma Research
https://www.readbyqxmd.com/read/28613167/a-light-illumination-enhancement-device-for-photoacoustic-imaging-i-in-vivo-i-animal-study
#7
Jaesok Yu, Joel S Schuman, Jung-Kun Lee, Sang Goo Lee, Jin Ho Chang, Kang Kim
Photoacoustic (PA) imaging detects acoustic signals generated by thermal expansion of light excited tissue or contrast agents. PA signal amplitude and image quality directly depend on the light fluence at the target depth. With conventional PA imaging systems, approximately 30% energy of incident light at the near-infrared region would be lost due to reflection on the skin surface. Such light loss directly leads to a reduction of PA signal and image quality. A new light delivery scheme that collects and re-distributes reflected light energy was recently suggested, which is called the light catcher...
June 8, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28612929/flexible-organic-inorganic-hybrid-near-infrared-photoplethysmogram-sensor-for-cardiovascular-monitoring
#8
Huihua Xu, Jing Liu, Jie Zhang, Guodong Zhou, Ningqi Luo, Ni Zhao
Wearable photoplethysmogram (PPG) sensors offer convenient and informative measurements for evaluating daily physiological states of individuals. In this work, epidermal and flexible near-infrared (NIR) PPG sensors integrating a low-power, high-sensitivity organic phototransistor (OPT) with a high-efficiency inorganic light-emitting diode are developed. By exploiting an organic bulk heterojunction active layer and a bilayer gate dielectric design, a low voltage (<3 V) operated OPT with NIR responsivity as high as 3...
June 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28610688/efficacy-of-patient-specific-bolus-created-using-three-dimensional-printing-technique-in-photon-radiotherapy
#9
Koya Fujimoto, Takehiro Shiinoki, Yuki Yuasa, Hideki Hanazawa, Keiko Shibuya
PURPOSE: A commercially available bolus ("commercial-bolus") does not make complete contact with the irregularly shaped patient skin. This study aims to customise a patient-specific three-dimensional (3D) bolus using a 3D printing technique ("3D-bolus") and to evaluate its clinical feasibility for photon radiotherapy. METHODS: The 3D-bolus was designed using a treatment planning system (TPS) in Digital Imaging and Communications in Medicine-Radiotherapy (DICOM-RT) format, and converted to stereolithographic format for printing...
June 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28609838/hepatoprotective-mechanism-of-lygodium-microphyllum-cav-r-br-through-ultrastructural-signaling-prevention-against-carbon-tetrachloride-ccl4-mediated-oxidative-stress
#10
Charles Gnanaraj, Muhammad Dawood Shah, Tan Tek Song, Mohammad Iqbal
Plants have been consumed in medicinal practices for centuries. Lygodium microphyllum (Cav.) R.Br. (Lygodiaceae), also known as Old World Climbing Fern, is a medicinal plant used by local communities in Sabah for skin and dysentery ailments. This study aims to test aqueous extract of L. microphyllum leaves for hepatoprotective and immunosuppressive activity in rats. Animal studies were carried out to evaluate hepatoprotection of aqueous extract of L. microphyllum at different doses (200, 400 and 600mg/kg b...
August 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28602800/critical-quality-attributes-in-vitro-release-and-correlated-in-vitro-skin-permeation-in-vivo-tape-stripping-collective-data-for-demonstrating-therapeutic-non-equivalence-of-topical-semisolids-a-case-study-of-ready-to-use-vehicles
#11
Tanja Ilić, Ivana Pantelić, Dominique Lunter, Sanela Đorđević, Bojan Marković, Dragana Ranković, Rolf Daniels, Snežana Savić
This work aimed to prove the ability of "ready-to-use" topical vehicles based on alkyl polyglucoside-mixed emulsifier (with/without co-solvent modifications) to replace the conventionally used pharmacopoeial bases (e.g., non-ionic hydrophilic cream) in compounding practice. For this purpose, considering the regulatory efforts to establish alternative, scientifically valid methods for evaluating therapeutic equivalence of topical semisolids, we performed a comparative assessment of microstructure, selected critical quality attributes (CQAs) and in vitro/in vivo product performances, by utilizing aceclofenac as a model drug...
June 8, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28602591/skin-grafts-from-genetically-modified-%C3%AE-1-3-galactosyltransferase-knockout-miniature-swine-a-functional-equivalent-to-allografts
#12
D A Leonard, C Mallard, A Albritton, R Torabi, M Mastroianni, D H Sachs, J M Kurtz, C L Cetrulo
Burn is associated with a considerable burden of morbidity worldwide. Early excision of burned tissue and skin grafting of the resultant wound has been established as a mainstay of modern burn therapy. However, in large burns, donor sites for autologous skin may be limited. Numerous alternatives, from cadaver skin to synthetic substitutes have been described, each with varying benefits and limitations. We previously proposed the use of genetically modified (alpha-1,3-galactosyl transferase knockout, GalT-KO) porcine skin as a viable skin alternative...
June 8, 2017: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/28602025/a-method-to-assess-the-protective-efficacy-of-sunscreens-against-visible-light-induced-pigmentation
#13
L Duteil, J Esdaile, Y Maubert, A Cathelineau, A Bouloc, C Queille-Roussel, T Passeron
BACKGROUND: Until now, photoprotection of human skin has involved the development of sunscreens effective in the ultraviolet (UV) domain. During the last ten years several studies have shown that besides the well-known damaging effects of UV, visible (400-700nm) and even infrared light (> 700 nm) can induce damage which contributes to photoaging. Furthermore, many photodermatoses are also known to be triggered by visible light (VL). OBJECTIVE/ METHOD: An in vivo method is proposed to assess the protective efficacy of sunscreens in the VL domain...
June 11, 2017: Photodermatology, Photoimmunology & Photomedicine
https://www.readbyqxmd.com/read/28596611/design-and-deposition-of-a-metal-like-and-admittance-matching-metamaterial-as-an-ultra-thin-perfect-absorber
#14
Yi-Jun Jen, Wei-Chih Liu, Tso-Kuei Chen, Shan-Wen Lin, Yi-Ciang Jhang
A stratiform metamaterial, comprising metal and dielectric thin films, exhibits both near-perfect antireflection and strong light extinction to function as a perfect and ultra-thin light absorber. The equivalent admittance and extinction coefficient of the metamaterial are tailored using a visual method that is based on an admittance diagram. A five-layered metamaterial was designed and deposited with a total thickness of 260 nm on a mirror to exhibit strong and wide angle absorption over wavelengths from 400 nm to 2000 nm...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28596104/effect-of-stratum-corneum-heterogeneity-anisotropy-asymmetry-and-follicular-pathway-on-transdermal-penetration
#15
Ana M Barbero, H Frederick Frasch
The impact of the complex structure of the stratum corneum on transdermal penetration is not yet fully described by existing models. A quantitative and thorough study of skin permeation is essential for chemical exposure assessment and transdermal delivery of drugs. The objective of this study is to analyze the effects of heterogeneity, anisotropy, asymmetry, follicular diffusion, and location of the main barrier of diffusion on percutaneous permeation. In the current study, the solution of the transient diffusion through a two-dimensional-anisotropic brick-and-mortar geometry of the stratum corneum is obtained using the commercial finite element program COMSOL Multiphysics...
June 5, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28595732/the-novel-double-hit-t-8-22-q24-q11-myc-igl-and-t-14-15-q32-q24-igh-bcl2a1-in-diffuse-large-b-cell-lymphoma
#16
Takashi Akasaka, Chiyuki Kishimori, Katsuhiro Fukutsuka, Miho Nakagawa, Kayo Takeoka, Masahiko Hayashida, Gen Honjo, Hitoshi Ohno
An 82-year-old woman presented with generalized lymphadenopathy and skin involvement. Lymph node biopsy revealed diffuse large B-cell lymphoma with a high proliferation index. G-banding and fluorescence in situ hybridization showed a hypertetraploid karyotype with two copies of t(8;22)(q24;q11), generating the fusion of MYC and the immunoglobulin λ chain gene (IGL), and two copies of the novel immunoglobulin heavy chain gene (IGH) translocation, t(14;15)(q32;q24). A long-distance inverse polymerase chain reaction (PCR) using nested primer combinations designed for each constant gene of IGH showed that Cγ4 was juxtaposed to the downstream sequence of the BCL2A1 (BCL2-related protein A1) gene through the Sγ4 switch region...
August 2017: Cancer Genetics
https://www.readbyqxmd.com/read/28595249/a-prospective-randomized-single-blind-study-comparing-cyanoacrylate-adhesives-to-sutures-for-wound-closure-in-skin-cancer-patients
#17
Diana W Bartenstein, Deborah L Cummins, Gary S Rogers
BACKGROUND: Cyanoacrylate tissue adhesives are not more likely to result in wound dehiscence or infection than sutured closures. However, suturing is the gold standard for optimal cosmetic appearance of scars. OBJECTIVE: To determine whether cyanoacrylate tissue adhesives produce a cosmetic outcome equivalent to sutures at 3 months. Secondary outcomes include time for wound closure, time spent on wound care, and surgeon and patient satisfaction. METHODS AND MATERIALS: Seventy-one patients scheduled for skin cancer excision at Beverly Hospital were included in this prospective, randomized, single-blind study...
June 6, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28591747/identification-and-causes-of-metabonomic-difference-between-orthotopic-and-subcutaneous-xenograft-of-pancreatic-cancer
#18
Bohan Zhan, Shi Wen, Jie Lu, Guiping Shen, Xianchao Lin, Jianghua Feng, Heguang Huang
Pancreatic ductal adenocarcinoma (PDAC) is one of the most lethal tumors. However, the methodological differences between orthotopic and subcutaneous xenograft (OX and SX) models will cause confusion in understanding its pathological mechanism and clinical relevance. In this study, SX and OX models were established by implanting Panc-1 and BxPC-3 cell strains under skin and on the pancreas of mice, respectively. The tumor tissue and serum samples were collected for1H NMR spectroscopy followed by univariate and multivariate statistical analyses...
May 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28590053/bryostatin-and-its-synthetic-analog-picolog-rescue-dermal-fibroblasts-from-prolonged-stress-and-contribute-to-survival-and-rejuvenation-of-human-skin-equivalents
#19
Tapan K Khan, Paul A Wender, Daniel L Alkon
Skin health is associated with the day-to-day activity of fibroblasts. The primary function of fibroblasts is to synthesize structural proteins, such as collagen, extracellular matrix proteins, and other proteins that support the structural integrity of the skin and are associated with younger, firmer, and more elastic skin that is better able to resist and recover from injury. At sub-nanomolar concentrations (0.03-0.3 nM), bryostatin-1 and its synthetic analog, picolog (0.1-10 nM) sustained the survival and activation of human dermal fibroblasts cultured under the stressful condition of prolonged serum deprivation...
June 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28585891/in%C3%A2-vitro-psoriasis-models-with-focus-on-reconstructed-skin-models-as-promising-tools-in-psoriasis-research
#20
Eline Desmet, Anesh Ramadhas, Jo Lambert, Mireille Van Gele
Psoriasis is a complex chronic immune-mediated inflammatory cutaneous disease associated with the development of inflammatory plaques on the skin. Studies proved that the disease results from a deregulated interplay between skin keratinocytes, immune cells and the environment leading to a persisting inflammatory process modulated by pro-inflammatory cytokines and activation of T cells. However, a major hindrance to study the pathogenesis of psoriasis more in depth and subsequent development of novel therapies is the lack of suitable pre-clinical models mimicking the complex phenotype of this skin disorder...
June 2017: Experimental Biology and Medicine
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