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Skin Pharmacology and Physiology

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https://www.readbyqxmd.com/read/28558374/development-of-an-in-vitro-test-procedure-to-determine-the-direct-infrared-a-protection-of-sunscreens-and-non-cosmetic-samples
#1
Jan Carlos Quistdorf, Dieter Kockott, Birgit Garbe, Ulrike Heinrich, Hagen Tronnier, Nicole Braun
BACKGROUND: Every day human skin is exposed to infrared A (IRA) radiation as part of the natural sun rays. As IRA radiation accounts for around one third of the solar radiation, it has gained great attention concerning its effects on the human body and skin. In the past few years it has been discussed controversially whether IRA radiation (of solar origin) is harmful or not. Nonetheless, there are several sunscreens on the German market that claim IRA protection for themselves. AIMS: The present study seeks to find an experimental set-up and a test procedure for the determination and quantification of direct IRA protection (realized via reflection or absorption of the IRA radiation), since to our knowledge these do not yet exist...
May 31, 2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28535540/development-of-a-synthetic-substrate-for-the-in-vitro-performance-testing-of-sunscreens
#2
Myriam Sohn, Camille Malburet, Laure Baptiste, Yvonne Prigl
PURPOSE: Polymethylmethacrylate (PMMA) plates generally used for the in vitro testing of sunscreens have failed to yield a satisfactory correlation between the sun protection factor (SPF) in vitro and that in vivo. In the present study, various polymers were investigated as alternative substrates to PMMA plates. PROCEDURES: In total, 14 polymers were tested in terms of ultraviolet (UV) transparency by transmission spectroscopy, and surface properties by contact angle measurement...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28528342/an-insight-into-the-changes-in-skin-texture-and-properties-following-dietary-intervention-with-a-nutricosmeceutical-containing-a-blend-of-collagen-bioactive-peptides-and-antioxidants
#3
Licia Genovese, Andrea Corbo, Sara Sibilla
BACKGROUND: Skin aging is a multifactorial phenomenon which causes alterations in skin physiological functions and, most visibly, phenotypic changes. In particular, during the aging process, hyaluronic acid, collagen, and elastin fibers undergo structural and functional changes. AIMS: This study aimed to give an insight into the photo-protective benefits and efficacy of an oral liquid nutricosmeceutical containing collagen bioactive peptides and antioxidants to counteract the signs of aging...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28423379/excessive-weight-favours-skin-physiology-up-to-a-point-another-expression-of-the-obesity-paradox
#4
Luís Monteiro Monteiro Rodrigues, Lídia Palma, Osvaldo Santos, Maria Angélica Almeida, Julia Bujan, Liliana Tavares
BACKGROUND/AIMS: Recently classified as an epidemic by the WHO, obesity (as well as the state of being overweight) clearly affects significant populations across all ages. The relationship between obesity and some diseases (e.g. cardiovascular ones) is known, although many paradoxes remain to be explained. Very little information is available, however, regarding its impact on skin physiology and skin disease. This study aims to examine the influence of excessive weight on epidermal hydration and transepidermal water loss, key variables of skin water balance and skin biomechanics...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28419984/topical-histamine-stimulates-repigmentation-of-nonsegmental-vitiligo-by-a-receptor-dependent-mechanism
#5
Jun Liu, Yan Xu, Tzu-Kai Lin, Chengzhi Lv, Peter M Elias, Mao-Qiang Man
BACKGROUND: Though vitiligo is a common depigmentary disorder, it still represents a substantial therapeutic challenge. Therapeutic options are limited in part due to its uncertain etiology. OBJECTIVE: Because recent studies suggest that histamine stimulates melanogenesis in vitro, we determined here whether topical histamine stimulates repigmentation in patients with stable, nonsegmental vitiligo. METHODS: A total of 23 otherwise normal volunteers with vitiligo, including 14 males and 9 females aged 6-59 years (mean age 29...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28407625/comparison-of-occlusive-and-open-application-in-a-psoriasis-plaque-test-design-exemplarily-using-investigations-of-mapracorat-0-1-ointment-versus-vehicle-and-reference-drugs
#6
Walter Wigger-Alberti, Ragna Williams, Yi-Ling von Mackensen, Maciej Hoffman-Wecker, Ulrike Grossmann, Gerald Staedtler, Richard Nkulikiyinka, Kaweh Shakery
BACKGROUND/AIMS: Psoriasis plaque tests (PPTs) are important tools in the early phases of antipsoriatic drug development. Two distinct PPT design variants (open vs. occluded drug application) are commonly used, but no previous work has aimed to directly compare and contrast their performance. METHODS: We compared the antipsoriatic efficacy of mapracorat 0.1% ointment and reference drugs reported in 2 separate studies, representing open and occluded PPT designs. The drug effect size was measured by sonography (mean change in echo-poor band thickness), chromametry, and standardized clinical assessment...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28407621/potential-applications-of-phyto-derived-ceramides-in-improving-epidermal-barrier-function
#7
Efrem N Tessema, Tsige Gebre-Mariam, Reinhard H H Neubert, Johannes Wohlrab
The outer most layer of the skin, the stratum corneum, consists of corneocytes which are coated by a cornified envelope and embedded in a lipid matrix of ordered lamellar structure. It is responsible for the skin barrier function. Ceramides (CERs) are the backbone of the intercellular lipid membranes. Skin diseases such as atopic dermatitis and psoriasis and aged skin are characterized by dysfunctional skin barrier and dryness which are associated with reduced levels of CERs. Previously, the effectiveness of supplementation of synthetic and animal-based CERs in replenishing the depleted natural skin CERs and restoring the skin barrier function have been investigated...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28376499/histoproteomic-characterization-of-localized-cutaneous-amyloidosis-in-x-linked-reticulate-pigmentary-disorder
#8
Vincenzo L'Imperio, Irene Bruno, Ingrid Rabach, Andrew Smith, Clizia Chinello, Martina Stella, Fulvio Magni, Fabio Pagni
No abstract text is available yet for this article.
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28319939/radical-scavenging-activity-of-a-sunscreen-enriched-by-antioxidants-providing-protection-in-the-whole-solar-spectral-range
#9
Carla Souza, Patrícia Maia Campos, Sabine Schanzer, Stephanie Albrecht, Silke B Lohan, Jürgen Lademann, Maxim E Darvin, Martina C Meinke
BACKGROUND/AIM: The main reason for extrinsic skin aging is the negative action of free radicals. The formation of free radicals in the skin has been associated with ultraviolet (UV) exposure and also to visible (VIS) and near-infrared (NIR) irradiations. The aim of the present study was to evaluate the efficacy of a sunscreen in the whole solar range. METHODS: The radical-scavenging activity of a sunscreen in the UV, VIS, and NIR ranges was evaluated using electron paramagnetic resonance spectroscopy...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28291967/phototoxicity-of-doxycycline-a-systematic-review-on-clinical-manifestations-frequency-cofactors-and-prevention
#10
Steven Goetze, Christian Hiernickel, Peter Elsner
BACKGROUND: One of the most important dermatologic side effects of doxycycline is photosensitivity. As doxycycline is important for malaria prophylaxis and malaria is mainly spread in countries with high sun radiation, special attention should be paid to this adverse effect. While there are many publications on the phototoxicity of tetracyclines in general, only a few exist focusing on doxycycline. The objective of this systematic review was to summarize all available reports on clinical manifestations, influencing factors like UV dose or dose of medication, and the possibilities of prevention by sun protection...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28291965/stingless-bee-honey-the-natural-wound-healer-a-review
#11
Mohd Azri Abd Jalil, Abdul Razak Kasmuri, Hazrina Hadi
BACKGROUND: The stingless bee is a natural type of bee that exists in almost every continent. The honey produced by this bee has been widely used across time and space. The distinctive feature of this honey is that it is stored naturally in the pot (cerumen), thus contributing to its beneficial properties, especially in the wound healing process. METHODS: In this article, several studies on stingless bee honey that pointed out the numerous therapeutic profiles of this honey in terms of its antioxidant, antimicrobial, anti-inflammatory, as well as moisturizing properties are reviewed...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28278501/standardization-of-an-in-vitro-model-for-evaluating-the-bioavailability-of-topically-applied-compounds-on-damaged-skin-application-to-sunscreen-analysis
#12
Carine Jacques-Jamin, Corinne Jeanjean-Miquel, Anaïs Domergue, Sandrine Bessou-Touya, Hélène Duplan
BACKGROUND: Information is lacking on the dermal penetration of topically applied formulations on in vitro skin models, under conditions where the stratum corneum (SC) is damaged. Therefore, we have developed a standardized in vitro barrier-disrupted skin model using tape stripping. METHODS: Different tape stripping conditions were evaluated using histology, transepidermal water loss, infrared densitometry, and caffeine absorption. RESULTS: The effects of tape stripping were comparable using pig and human skin...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28226316/clinical-evidence-of-increase-in-hair-growth-and-decrease-in-hair-loss-without-adverse-reactions-promoted-by-the-commercial-lotion-ecohair%C3%A2
#13
María Rosario Alonso, Claudia Anesini
BACKGROUND/AIMS: Hair exerts protection, sensory functions, thermoregulation, and sexual attractiveness. Hair loss (alopecia) is caused by several diseases, drug intake, hormone imbalance, stress, and infections (Malassesia furfur). Drugs usually used in alopecia produce irreversible systemic and local side effects. An association of extracts of Coffea arabica and Larrea divaricata (ECOHAIR®) is successfully being commercialized in Argentina for hair growth. The aim of this study was to provide scientific support for the efficacy and innocuousness of ECOHAIR® in patients with noncicatricial alopecia during a 3-month treatment...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28222425/post-finasteride-adverse-effects-in-male-androgenic-alopecia-a-case-report-of-vitiligo
#14
Ion G Motofei, David L Rowland, Simona R Georgescu, Mircea Tampa, Stana Paunica, Vlad D Constantin, Cristian Balalau, Mirela Manea, Bogdan C Baleanu, Ioanel Sinescu
Finasteride has proved to be relatively safe and effective in the therapeutic management of male androgenic alopecia. However, literature data report several endocrine imbalances inducing various adverse effects, which often persist after treatment cessation in the form of post-finasteride syndrome. Here we present the case of a 52-year-old man receiving finasteride (1 mg/day) who developed an uncommon adverse effect represented by generalized vitiligo 2 months after finasteride discontinuation. Associated adverse effects encountered were represented by mild sexual dysfunction (as determined by the International Index of Erectile Function, IIEF) and moderate depressive symptoms (according to DSM-V criteria), all of these manifestations aggregating within/as a possible post-finasteride syndrome...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28214837/efficacy-of-glucosamine-sulphate-in-skin-ageing-results-from-an-ex-vivo-anti-ageing-model-and-a-clinical-trial
#15
Audrey Gueniche, Isabelle Castiel-Higounenc
BACKGROUND: Glucosamine sulphate (GS) is essential in the biosynthesis of glycolipids, glycoproteins, glycosaminoglycans (GAGs), hyaluronate, and proteoglycans. Connective tissues primarily contain collagen and proteoglycans and play an important role in skin ageing. OBJECTIVE: The objectives were to assess ex vivo the impact of GS on skin ageing parameters and in vivo the effect of GS on the skin physiology of mature healthy volunteers after oral intake. METHODS: The impact of GS on skin ageing was assessed ex vivo via different immunohistochemical assays and histology and via a clinical study using biopsies...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28152530/the-preventive-effect-of-coffee-compounds-on-dermatitis-and-epidermal-pigmentation-after-ultraviolet-irradiation-in-mice
#16
Yurika Yamate, Keiichi Hiramoto, Eisuke F Sato
BACKGROUND: Ultraviolet (UV) irradiation is well known to promote inflammation and pigmentation of skin. UVB mainly affects dermatitis and pigmentation. Coffee contains a number of polyphenols, such as caffeic acid (CA) and chlorogenic acid (CGA) but their in vivo bioactivity for photobiology remains unclear. METHODS: C57BL/6j male mice were irradiated with UVB (1.0 kJ/m2/day) for 3 days. Five days after the final session of UVB irradiation, the dorsal skin, ear epidermis, and blood samples were analyzed to investigate the inflammatory factors, melanogenesis factors and related hormones...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28142143/nrf2-and-bach1-may-play-a-role-in-the-modulation-of-ultraviolet-a-induced-oxidative-stress-by-acetyl-11-keto-%C3%AE-boswellic-acid-in-skin-keratinocytes
#17
Shiying Yang, Bin Zhou, Wei Xu, Fangfang Xue, Muhammad Farrukh Nisar, Chunxiang Bian, Xiao Huang, Li Yang, Yiguo Zhang, Jörg W Bartsch, Julia Li Zhong
BACKGROUND: Exposure of human skin to solar ultraviolet A (UVA) irradiation causes severe oxidative stress with damage to various cellular components and concomitant inflammation and carcinogenesis. OBJECTIVE: The aim of this study is to investigate the protective effect of acetyl-11-keto-β-boswellic acid (AKBA) against UVA radiation on human skin keratinocytes. METHODS: HaCaT cells were pretreated with AKBA followed by UVA irradiation. Radiation effects on cell morphology, cell viability, intracellular reactive oxygen species (ROS) levels, and antioxidant enzymes were examined...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28122376/sensitive-skin-assessment-of-the-skin-barrier-using-confocal-raman-microspectroscopy
#18
Renée J H Richters, Denise Falcone, Natallia E Uzunbajakava, Babu Varghese, Peter J Caspers, Gerwin J Puppels, Piet E J van Erp, Peter C M van de Kerkhof
BACKGROUND/AIMS: Sensitive skin (SS), a frequently reported condition in the Western world, has been suggested to be underlined by an impaired skin barrier. The aim of this study was to investigate the skin barrier molecular composition in SS subjects using confocal Raman microspectroscopy (CRS), and to compare it with that of non-SS (NSS) individuals as well as atopic dermatitis (AD) and allergic rhinoconjunctivitis (AR) subjects, who frequently report SS. METHODS: Subjects with SS (n = 29), NSS (n = 30), AD (n = 11), and AR (n = 27) were included...
2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28099963/low-molecular-weight-hydrophilic-and-lipophilic-antioxidants-in-nonmelanoma-skin-carcinomas-and-adjacent-normal-looking-skin
#19
COMPARATIVE STUDY
Konstantina Grammenandi, Maria Kyriazi, Alexandra Katsarou-Katsari, Othon Papadopoulos, Ioanna Anastassopoulou, Georgios T Papaioannou, Alexandros Sagriotis, Michail Rallis, Howard I Maibach
Low-molecular-weight antioxidants are some of the most efficient agents of the skin defense mechanism against environmental factors, such as cosmic rays, smoke, and pollutants. The total skin concentrations of hydrophilic ascorbic and uric acids, as well as lipophilic α-tocopherol, β-carotene, and ubiquinol-10 antioxidants were determined by an HPLC-EC detector from 18 biopsies of human nonmelanoma skin carcinomas and 18 biopsies from skin areas adjacent to carcinomas. No significant differences in the concentrations of lipophilic antioxidants in both carcinomas and normal-looking skin areas adjacent to carcinomas were observed...
2016: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28095386/in-vitro-evaluation-of-the-cleansing-effect-of-a-monofilament-fiber-debridement-pad-compared-to-gauze-swabs
#20
COMPARATIVE STUDY
Cornelia Wiegand, Kirsten Reddersen, Uta-Christina Hipler, Martin Abel, Peter Ruth, Anneke Andriessen
BACKGROUND: Removal of nonvital tissue is an accepted method to eradicate biofilms and to stimulate wound healing. Debridement using a monofilament polyester fiber pad has clinically been shown to be effective as well as pain and trauma free. METHODS: For in vitro determination of the cleansing capacity of this product compared to gauze swabs, a wound debridement model was used with glass plates coated with a bovine serum albumin solution, stained with hematoxylin...
2016: Skin Pharmacology and Physiology
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