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https://www.readbyqxmd.com/read/29471244/two-sesquiterpene-aminoquinones-protect-against-oxidative-injury-in-hacat-keratinocytes-via-activation-of-ampk%C3%AE-erk-nrf2-are-ho-1-signaling
#1
Li Liu, Wei Wu, Jing Li, Wei-Hua Jiao, Li-Yun Liu, Jie Tang, Lei Liu, Fan Sun, Bing-Nan Han, Hou-Wen Lin
AIMS: To investigate the cytoprotective effects of two sesquiterpene aminoquinones isolated from the marine sponge Dysidea fragilis, Dysidaminone H (DA8) and 3'-methylamino-avarone (DA14), we examined their effects against hydrogen peroxide (H2 O2 )-induced oxidative injury in human keratinocyte cell line and elucidated the underlying mechanisms. MAIN METHODS: Cell viability was detected using a CCK-8 assay kit. Intracellular reactive oxygen species (ROS) production was measured by fluorescence of 2, 7-Dichlorodi-hydrofluorescein diacetate (DCFH-DA)...
February 19, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29471220/an-investigation-of-konjac-glucomannan-keratin-hydrogel-scaffold-loaded-with-avena-sativa-extracts-for-diabetic-wound-healing
#2
Praveen Krishna Veerasubramanian, Ponrasu Thangavel, Ramya Kannan, Sudip Chakraborty, Balaji Ramachandran, Lonchin Suguna, Vignesh Muthuvijayan
We have developed a novel hydrogel composed of konjac glucomannan (KGM), human hair proteins (KER), and an ethanolic extract of Avena sativa (OAT) and evaluated its potential as a dressing material for diabetic wounds. KGM is an excellent biocompatible gelling agent that stimulates fibroblast proliferation and immunomodulation. Human hair proteins (KER) are biocompatible, biodegradable, and possess abundant cell adhesion sites. KER also promotes fibroblast attachment and proliferation, keratinocyte migration, and collagen expression, which can accelerate wound healing...
February 13, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29470442/phycocyanin-protects-against-uvb-induced-apoptosis-through-the-pkc-%C3%AE-%C3%AE-ii-nrf-2-ho-1-dependent-pathway-in-human-primary-skin-cells
#3
Ki Mo Kim, Joo Young Lee, A-Rang Im, Sungwook Chae
Phycocyanin (Pc) is one of the active pigment constituents of Spirulina microalgae. It has been used for its potent antioxidant and anti-inflammatory properties. However, the protective effects of Pc against ultraviolet-B (UVB)-induced primary skin cells damage are still undefined. In the present study, we investigated whether Pc prevented UVB-induced apoptotic cell death in human dermal fibroblasts (HDF) and human epidermal keratinocytes (HEK). Pc induced the transcription of heme oxygenase-1 (HO-1). Furthermore, Pc treatments resulted in a marked increase in nuclear factor erythroid-derived 2 (NF-E2)-like 2 (Nrf-2) nuclear translocation...
February 22, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29469732/mycobacterium-fortuitum-infection-after-acupuncture-treatment
#4
T Gracia-Cazaña, A Milagro, F Queipo, Y Gilaberte
Actinic keratoses are cutaneous lesions that appear as the result of the proliferation of atypical keratinocytes. These lesions are considered pre-malignant and they can progress to squamous cell carcinoma. Ingenol mebutate has been approved as an effective treatment for AK on the face and trunk. We studied the local skin reactions to this therapy. Data about local skin reactions were collected in a series of 5 patients with photographic documentation, a visual analog scale, and a ranking of satisfaction of the patient...
September 19, 2017: Dermatology Online Journal
https://www.readbyqxmd.com/read/29469731/local-skin-reactions-following-the-administration-of-topical-ingenol-mebutate-for-actinic-keratosis
#5
Alberto Conde-Taboada, Bárbara Mercado, Beatriz Aranegui, Elena González-Guerra, Eduardo López-Bran
Actinic keratoses are cutaneous lesions that appear as the result of the proliferation of atypical keratinocytes. These lesions are considered pre-malignant and they can progress to squamous cell carcinoma. Ingenol mebutate has been approved as an effective treatment for AK on the face and trunk. We studied the local skin reactions to this therapy. Data about local skin reactions were collected in a series of 5 patients with photographic documentation, a visual analog scale, and a ranking of satisfaction of the patient...
September 15, 2017: Dermatology Online Journal
https://www.readbyqxmd.com/read/29468680/proinflammatory-role-of-blister-fluid-derived-exosomes-in-bullous-pemphigoid
#6
Hui Fang, Shuai Shao, Man Jiang, Erle Dang, Shengxian Shen, Jieyu Zhang, Pei Qiao, Caixia Li, Gang Wang
Bullous pemphigoid is an autoimmune inflammatory disorder characterised by the presence of autoantibodies against bullous pemphigoid autoantigens, leading to dermal-epidermal separation with consequent blister formation. However, whether and how the components of blister fluid exacerbate the progression of bullous pemphigoid is unclear. Exosomes are nanometre-sized vesicles released from cells into the body fluid, where they can transmit signals throughout the body. In the present study, we isolated and characterised exosomes from the blister fluids of patients with bullous pemphigoid, evaluated their proinflammatory role, and identified the underlying molecular mechanisms...
February 22, 2018: Journal of Pathology
https://www.readbyqxmd.com/read/29468452/leptin-regulates-the-pro-inflammatory-response-in-human-epidermal-keratinocytes
#7
Moonyoung Lee, Eunyoung Lee, Sun Hee Jin, Sungjin Ahn, Sae On Kim, Jungmin Kim, Dalwoong Choi, Kyung-Min Lim, Seung-Taek Lee, Minsoo Noh
The role of leptin in cutaneous wound healing process has been suggested in genetically obese mouse studies. However, the molecular and cellular effects of leptin on human epidermal keratinocytes are still unclear. In this study, the whole-genome-scale microarray analysis was performed to elucidate the effect of leptin on epidermal keratinocyte functions. In the leptin-treated normal human keratinocytes (NHKs), we identified the 151 upregulated and 53 downregulated differentially expressed genes (DEGs). The gene ontology (GO) enrichment analysis with the leptin-induced DEGs suggests that leptin regulates NHKs to promote pro-inflammatory responses, extracellular matrix organization, and angiogenesis...
February 21, 2018: Archives of Dermatological Research
https://www.readbyqxmd.com/read/29467931/toll-like-receptor-2-induces-adenosine-receptor-a2a-and-promotes-human-squamous-carcinoma-cell-growth-via-extracellular-signal-regulated-kinases-%C3%A2
#8
Chithra Devi Palani, Lalitha Ramanathapuram, Aroonwan Lam-Ubol, Zoya B Kurago
Patient treatment for oral squamous cell carcinoma (OSCC) not associated with Human papillomavirus remains problematic. OSCC microenvironment is typically inflamed and colonized by microorganisms, providing ligands for toll-like receptors (TLR). In immune cells TLR2 and TLR4 activate NF-kB and extracellular signal regulated kinase (ERK)1/2 pathways, leading to upregulation of inhibitory adenosine receptors A2a and A2b, and reduction in stimulatory A1 and A3. How TLR and adenosine receptors function in SCC cells is not understood...
January 23, 2018: Oncotarget
https://www.readbyqxmd.com/read/29467909/apoptosis-sensitizing-activity-of-birinapant-in-head-and-neck-squamous-cell-carcinoma-cell-lines
#9
Roman C Brands, Mario J J Scheurer, Stefan Hartmann, Axel Seher, Alexander C Kübler, Urs D A Müller-Richter
Inhibitor of apoptosis proteins, which are overexpressed in head and neck squamous cell carcinoma (HNSCC), may cause therapeutic resistance. Using SMAC mimetic compounds, including birinapant, to degrade and/or inhibit these proteins and sensitize apoptosis may enhance therapies in HNSCC. Fas expression was analyzed in nine HNSCC cell lines and one keratinocyte cell line via flow cytometry. These cell lines were treated with Fas ligand-Fc (FasL) and birinapant, a bivalent SMAC mimetic, in mono and combination therapies...
March 2018: Oncology Letters
https://www.readbyqxmd.com/read/29467325/lipid-abnormalities-in-atopic-skin-are-driven-by-type-2-cytokines
#10
Evgeny Berdyshev, Elena Goleva, Irina Bronova, Nathan Dyjack, Cydney Rios, John Jung, Patricia Taylor, Mingeum Jeong, Clifton F Hall, Brittany N Richers, Kathryn A Norquest, Tao Zheng, Max A Seibold, Donald Ym Leung
Lipids in the stratum corneum of atopic dermatitis (AD) patients differ substantially in composition from healthy subjects. We hypothesized that hyperactivated type 2 immune response alters AD skin lipid metabolism. We have analyzed stratum corneum lipids from nonlesional and lesional skin of AD subjects and IL-13 skin-specific Tg mice. We also directly examined the effects of IL-4/IL-13 on human keratinocytes in vitro. Mass spectrometric analysis of lesional stratum corneum from AD subjects and IL-13 Tg mice revealed an increased proportion of short-chain (N-14:0 to N-24:0) NS ceramides, sphingomyelins, and 14:0-22:0 lysophosphatidylcholines (14:0-22:0 LPC) with a simultaneous decline in the proportion of corresponding long-chain species (N-26:0 to N-32:0 sphingolipids and 24:0-30:0 LPC) when compared with healthy controls...
February 22, 2018: JCI Insight
https://www.readbyqxmd.com/read/29466596/acute-respiratory-distress-syndrome-advances-in-diagnosis-and-treatment
#11
Eddy Fan, Daniel Brodie, Arthur S Slutsky
Importance: Acute respiratory distress syndrome (ARDS) is a life-threatening form of respiratory failure that affects approximately 200 000 patients each year in the United States, resulting in nearly 75 000 deaths annually. Globally, ARDS accounts for 10% of intensive care unit admissions, representing more than 3 million patients with ARDS annually. Objective: To review advances in diagnosis and treatment of ARDS over the last 5 years. Evidence Review: We searched MEDLINE, EMBASE, and the Cochrane Database of Systematic Reviews from 2012 to 2017 focusing on randomized clinical trials, meta-analyses, systematic reviews, and clinical practice guidelines...
February 20, 2018: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29464849/in-vitro-protective-effects-of-an-aqueous-extract-of-clitoria-ternatea-l-flower-against-hydrogen-peroxide-induced-cytotoxicity-and-uv-induced-mtdna-damage-in-human-keratinocytes
#12
N N A Zakaria, E J Okello, M-J Howes, M A Birch-Machin, A Bowman
The traditional practice of eating the flowers of Clitoria ternatea L. or drinking their infusion as herbal tea in some of the Asian countries is believed to promote a younger skin complexion and defend against skin aging. This study was conducted to investigate the protective effect of C. ternatea flower water extract (CTW) against hydrogen peroxide-induced cytotoxicity and ultraviolet (UV)-induced mitochondrial DNA (mtDNA) damage in human keratinocytes. The protective effect against hydrogen peroxide-induced cytotoxicity was determined by 3-(4, 5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium assay, and mtDNA damage induced by UV was determined by polymerase chain reaction...
February 21, 2018: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29464168/treatment-strategies-for-hypopigmentation-in-the-context-of-burn-hypertrophic-scars
#13
Bonnie C Carney, Jacqueline P McKesey, Dean S Rosenthal, Jeffrey W Shupp
Dyspigmentation in burn scars can contribute to the development of psychosocial complications after injury and can be detrimental to social reintegration and quality of life for burn survivors. Although treatments for skin lightening to treat hyperpigmentation have been well reviewed in the literature, skin-darkening strategies to treat hypopigmentation have not. The following potential treatment options in the context of burn hypertrophic scar will be discussed: use of the melanocyte-keratinocyte transplantation procedure, use of ectopic synthetic analogues of alpha-melanocyte stimulating hormone to initiate melanogenesis, and use of FK506 to induce melanogenesis...
January 2018: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/29464051/human-papillomavirus-e7-oncoprotein-expression-by-keratinocytes-alters-the-cytotoxic-mechanisms-used-by-cd8-t-cells
#14
Purnima Bhat, Anne-Sophie Bergot, Nigel Waterhouse, Ian Hector Frazer
Cervical cancer is a malignant transformation of keratinocytes initiated by the E7 oncoprotein of human papillomavirus (HPV). These tumors are characterized by keratinocyte hyperproliferation and are often infiltrated with activated CD8 T cells. HPV infection confers changes to gain immunological advantage to promote chronic infection, and these persist with malignant transformation. We investigated the relative importance of the many redundant mechanisms of cytotoxicity used by CD8 T cells to kill keratinocytes expressing HPV E7 oncoprotein using extended-duration time-lapse microscopy that allows examination of cell-to-cell interactions during killing...
January 19, 2018: Oncotarget
https://www.readbyqxmd.com/read/29463581/a-novel-mechanism-for-activation-of-gli1-by-nuclear-smo-that-escapes-anti-smo-inhibitors
#15
Muhammad M Rahman, Allon Hazan, Joanne L Selway, Dimalee S Herath, Catherine A Harwood, Muhammad S Pirzado, Ravinder Atkar, David P Kelsell, Kenneth J Linton, Mike P Philpott, Graham W Neill
Small molecule inhibitors of the Hedgehog (HH) pathway receptor Smoothened (SMO) have been effective in treating some patients with basal cell carcinoma (BCC), where the HH pathway is often activated, but many patients are poorly responsive. In this study, we report the results of investigations on PTCH1 signalling in the HH pathway that suggest why most BCC patients respond poorly to SMO inhibitors. In immortalised human keratinocytes, PTCH1 silencing led to the generation of a compact, holoclone-like morphology with increased expression of SMO and the downstream HH pathway transcription factor GLI1...
February 20, 2018: Cancer Research
https://www.readbyqxmd.com/read/29463027/the-connexin-mimetic-peptide-gap27-and-cx43-knockdown-reveal-differential-roles-for-connexin43-in-wound-closure-events-in-skin-model-systems
#16
Chrysovalantou Faniku, Erin O'Shaughnessy, Claire Lorraine, Scott R Johnstone, Annette Graham, Sebastian Greenhough, Patricia E M Martin
In the epidermis, remodelling of Connexin43 is a key event in wound closure. However, controversy between the role of connexin channel and non-channel functions exist. We compared the impact of SiRNA targeted to Connexin43 and the connexin mimetic peptide Gap27 on scrape wound closure rates and hemichannel signalling in adult keratinocytes (AK) and fibroblasts sourced from juvenile foreskin (JFF), human neonatal fibroblasts (HNDF) and adult dermal tissue (ADF). The impact of these agents, following 24 h exposure, on GJA1 (encoding Connexin43), Ki67 and TGF-β1 gene expression, and Connexin43 and pSmad3 protein expression levels, were examined by qPCR and Western Blot respectively...
February 18, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29462589/potentiation-of-skin-tslp-production-by-a-cosmetic-colorant-leads-to-aggravation-of-dermatitis-symptoms
#17
Gabsik Yang, Hye Eun Lee, Kyung-Min Lim, Yong-Kyu Choi, Kyu-Bong Kim, Byung-Mu Lee, Joo Young Lee
Certain cosmetic colorants are irritant to skin or aggravate dermatitis. Thymic stromal lymphopoietin (TSLP) plays an important role in the initiation and progress of skin inflammation and atopic dermatitis by triggering Th2 immune responses. However, the effects of cosmetic colorants on TSLP production are unknown yet. Therefore, we investigated whether cosmetic colorants regulated TSLP production and dermatitis. Lithol Rubine B (LR-B, Pigment Red 57) and its calcium salt (LR-BCA), commonly used cosmetic colorants, potentiated phorbol-12-myristate-13-acetate-induced TSLP production in keratinocytes...
February 17, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29462476/malassezia-pachydermatis-up-regulates-ahr-related-cyp1a1-gene-and-epidermal-barrier-markers-in-human-keratinocytes
#18
Elisabetta Buommino, Adone Baroni, Chiara Papulino, Francesca Paola Nocera, Lorena Coretti, Giovanna Donnarumma, Anna De Filippis, Luisa De Martino
Cytochrome P450 CYP1A1 and CYP1B1 enzymes are regulated by the aryl hydrocarbon receptor (AhR), a transcription factor activated by a variety of ligands among which Malassezia metabolites. In this study, we analyzed the modulation of CYP1A1, CYP1B1, and AhR in human keratinocytes infected with different strains of Malassezia pachydermatis, as well as the upregulation of some genes involved in the epidermal homeostasis. We demonstrated that all the strains induced AhR activation and its nuclear translocation in HaCaT cells infected for 24 h, compared to untreated cells...
February 15, 2018: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/29460829/-quality-control-study-of-engineered-skin-tissue
#19
K V Nakhod, A L Rusanov, E D Luzgina, D S Druzhilovskiy, N G Luzgina, A V Lisitsa
OMERO service was used to annotate the cell line HaCaT microscope images by two independent expert groups. The images were obtained in the course of developing tissue-engineered epithelium which consisted of several layers of the keratinocytes. Evaluation of expert opinions was performed by calculation of specificity, sensitivity and accuracy. The best convergence of opinions (91%) was achieved for the confluence of the cell monolayers. Accuracy 70% was observed in determining the extent of cell differentiation after 10 days of incubation...
January 2018: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/29460722/cutaneous-toxicity-in-a-laboratory-beagle-canis-lupus-familiaris-after-chronic-administration-of-doxorubicin-hydrochloride
#20
Kathryn A Guerriero, Steven R Wilson, Nabil E Boutagy, Chi Liu, Albert J Sinusas, Caroline J Zeiss
An adult female beagle (Canis lupus familiaris) used in a model of doxorubicin-induced cardiomyopathy presented with epithelial desquamation on the shoulders and ventrum after receiving the 8th weekly intravenous dose of the free form of doxorubicin (20 mg/m2; total accumulation, 160 mg/m2). The lesions were empirically treated with topical disinfectants and topical and systemic antibiotics. Despite treatment, the lesions progressed and ulcerated. Bacterial culture revealed Staphylococcus aureus, but trichogram, skin scraping, and fungal culture were negative for microorganisms...
February 1, 2018: Comparative Medicine
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