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https://www.readbyqxmd.com/read/28340212/accelerated-senescence-in-skin-in-a-murine-model-of-radiation-induced-multi-organ-injury
#1
Elizabeth A McCart, Rajesh L Thangapazham, Eric D Lombardini, Steven R Mog, Ronald Allan M Panganiban, Kelley M Dickson, Rihab A Mansur, Vitaly Nagy, Sung-Yop Kim, Reed Selwyn, Michael R Landauer, Thomas N Darling, Regina M Day
Accidental high-dose radiation exposures can lead to multi-organ injuries, including radiation dermatitis. The types of cellular damage leading to radiation dermatitis are not completely understood. To identify the cellular mechanisms that underlie radiation-induced skin injury in vivo, we evaluated the time-course of cellular effects of radiation (14, 16 or 17 Gy X-rays; 0.5 Gy/min) in the skin of C57BL/6 mice. Irradiation of 14 Gy induced mild inflammation, observed histologically, but no visible hair loss or erythema...
March 18, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28332183/retinoic-acid-receptor-related-orphan-receptor-ror%C3%AE-regulates-differentiation-and-survival-of-keratinocytes-during-hypoxia
#2
Hongyu Li, Longjian Zhou, Jun Dai
Low O2 pressures present in the microenvironment of epidermis control keratinocyte differentiation and epidermal barrier function through hypoxia inducible factors (HIFs) dependent gene expression. This study focuses on investigating relations of the retinoic acid receptor-related orphan receptor alpha (RORα) to HIF-1α in keratinocytes under hypoxic conditions. The expression level of RORα is significantly elevated under hypoxia in both human and murine keratinocytes. Gene silencing of RORA attenuates hypoxia-stimulated expression of genes related to late differentiation and epidermal barrier function, and leads to an enhanced apoptotic response...
March 23, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28330776/topical-application-of-glycolic-acid-suppresses-the-uvb-induced-il-6-il-8-mcp-1-and-cox-2-inflammation-by-modulating-nf-%C3%AE%C2%BAb-signaling-pathway-in-keratinocytes-and-mice-skin
#3
Sheau-Chung Tang, Pei-Yun Liao, Sung-Jen Hung, Jheng-Siang Ge, Shiou-Mei Chen, Ji-Ching Lai, Yu-Ping Hsiao, Jen-Hung Yang
BACKGROUND: Glycolic acid (GA), commonly present in fruits, has been used to treat dermatological diseases. Extensive exposure to solar ultraviolet B (UVB) irradiation plays a crucial role in the induction of skin inflammation. The development of photo prevention from natural materials represents an effective strategy for skin keratinocytes. OBJECTIVE: The aim of this study was to investigate the molecular mechanisms underlying the glycolic acid (GA)-induced reduction of UVB-mediated inflammatory responses...
March 11, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28330735/vancomycin-loaded-nanobubbles-a-new-platform-for-controlled-antibiotic-delivery-against-methicillin-resistant-staphylococcus-aureus-infections
#4
Monica Argenziano, Giuliana Banche, Anna Luganini, Nicole Finesso, Valeria Allizond, Giulia Rossana Gulino, Amina Khadjavi, Rita Spagnolo, Vivian Tullio, Giuliana Giribaldi, Caterina Guiot, Anna Maria Cuffini, Mauro Prato, Roberta Cavalli
Vancomycin (Vm) currently represents the gold standard against methicillin-resistant Staphylococcus aureus (MRSA) infections. However, it is associated with low oral bioavailability, formulation stability issues, and severe side effects upon systemic administration. These drawbacks could be overcome by Vm topical administration if properly encapsulated in a nanocarrier. Intriguingly, nanobubbles (NBs) are responsive to physical external stimuli such as ultrasound (US), promoting drug delivery. In this work, perfluoropentane (PFP)-cored NBs were loaded with Vm by coupling to the outer dextran sulfate shell...
March 19, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28330720/attenuation-of-uvr-induced-vitamin-d3-synthesis-in-a-mouse-model-deleted-for-keratinocyte-lathosterol-5-desaturase
#5
Anastasia M Makarova, Saloni Pasta, Gordon Watson, Cedric Shackleton, Ervin H Epstein
The lower risk of some internal cancers at lower latitudes has been linked to greater sun exposure and consequent higher levels of ultraviolet radiation (UVR)-produced vitamin D3 (D3). To separate the experimental effects of sunlight and of all forms of D3, a mouse in which UVR does not produce D3 would be useful. To this end we have generated mice carrying a modified allele of sterol C5-desaturase (Sc5d), the gene encoding the enzyme that converts lathosterol to 7-dehydrocholesterol (7-DHC), such that Sc5d expression can be inactivated using the Cre/lox site-specific recombination system...
March 19, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28329680/major-roles-for-pyrimidine-dimers-nucleotide-excision-repair-and-atr-in-the-alternative-splicing-response-to-uv-irradiation
#6
Manuel J Muñoz, Nicolás Nieto Moreno, Luciana E Giono, Adrián E Cambindo Botto, Gwendal Dujardin, Giulia Bastianello, Stefania Lavore, Antonio Torres-Méndez, Carlos F M Menck, Benjamin J Blencowe, Manuel Irimia, Marco Foiani, Alberto R Kornblihtt
We have previously found that UV irradiation promotes RNA polymerase II (RNAPII) hyperphosphorylation and subsequent changes in alternative splicing (AS). We show now that UV-induced DNA damage is not only necessary but sufficient to trigger the AS response and that photolyase-mediated removal of the most abundant class of pyrimidine dimers (PDs) abrogates the global response to UV. We demonstrate that, in keratinocytes, RNAPII is the target, but not a sensor, of the signaling cascade initiated by PDs. The UV effect is enhanced by inhibition of gap-filling DNA synthesis, the last step in the nucleotide excision repair pathway (NER), and reduced by the absence of XPE, the main NER sensor of PDs...
March 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/28329661/predictors-of-actinic-keratosis-count-in-those-with-multiple-keratinocyte-carcinomas
#7
Julia A Siegel, Adam J Luber, Martin A Weinstock
Actinic keratoses (AKs) are frequently treated in the U.S., impacting an estimated 40 million people in 2004 and costing over $1 billion annually. AKs are a major public health concern because of their high prevalence, substantial cost, and potential for malignant transformation to keratinocyte carcinoma (KC). In this analysis, predictors of AK count were explored using pre-randomization baseline data from two large randomized trials of veterans with multiple prior KCs (n=932 and n=1131). Multivariate analyses were conducted to elucidate associations between AK count and several demographic and health related factors...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329655/new-keratinocyte-carcinomas-worsen-skin-related-quality-of-life
#8
Julia A Siegel, Mary-Margaret Chren, Martin A Weinstock
Keratinocyte carcinoma (KC) is the most common malignancy in the U.S. Because KC affects many people but has a low mortality rate, it is important to consider the impact of KC on skin-related quality of life (QoL). We aimed to determine if KCs, actinic keratoses (AKs), and several demographic and health-related factors were associated with skin- related QoL in those at high risk for KC. We used data from a double-blind, placebo- controlled trial in which 932 veterans with multiple prior KCs were randomized to apply topical 5-fluorouracil (5-FU) or vehicle control cream to the face/ears...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329654/keratinocyte-carcinoma-and-risk-of-all-cause-and-cancer-related-mortality-a-systematic-review
#9
V Barton, K Armeson, S Hampras, L K Ferris, K Visvanathan, D Rollison, A J Alberg
BackgroundSome reports suggest a history of keratinocyte carcinoma (KC) may be associated with increased mortality. The high prevalence of KC makes the possibility of associated subsequent mortality from other causes important from a clinical and public health perspective. However, the variable methods and findings of existing studies leave the overall significance of these results uncertain. To provide clarity, we conducted a systematic review to characterize the evidence on the associations of KC with: 1) all-cause mortality, 2) cancer-specific mortality, and 3) cancer survival...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329644/family-history-of-cancer-in-relation-to-the-risk-of-keratinocyte-carcinoma-plus-another-type-of-cancer-a-case-control-study
#10
J Small, C Flanagan, K Armeson, D Perry, R Marchell, B Thiers, A J Alberg
BackgroundA personal history of keratinocyte carcinoma (KC) is associated with increased risk for other malignancies. To assess the role of inherited cancer predisposition we investigated if family history (FH) of skin cancer plus noncutaneous malignancy is associated with the risk of KC plus another type of cancer.MethodsThis clinic-based case-control study of non-Hispanic Caucasians had three age- and gender-matched groups: KC plus another cancer (n=49), KC only (n=50), and cancer-free controls (n=50). Patients were interviewed to assess FH in first-degree relatives of "skin cancer" and "cancer other than skin cancer...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329636/correlation-between-cancer-incidences-and-google-searches-in-the-united-states
#11
Mackenzie R Wehner, Kevin T Nead, Eleni Linos
IntroductionDespite being highly prevalent, keratinocyte carcinomas (basal cell and squamous cell carcinomas lack nationwide registries. Internet search data has emerged as a new method to evaluate previously difficult to quantify public health outcomes and may be useful in keratinocyte carcinoma research.ObjectiveWe aimed to evaluate whether Google search density correlated with known incidences of common cancers in the United States.MethodsWe used the Center for Disease Control's National Program of Cancer Registries ageTadjusted cancer incidences (2008T2012 ...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329631/the-burden-of-keratinocyte-cancer-occurrence-multiplicity-and-predicting-risk
#12
David C Whiteman, Nirmala Pandeya, Bridie Thompson, Padmini Subramaniam, Jean Claude Dusingize, Rachel E Neale, Adele C Green, Catherine M Olsen
The costs of diagnosing and treating basal cell carcinomas (BCC) and squamous cell carcinomas (SCC) are the highest of all cancers in Australia. However, information regarding incidence, multiplicity and risk are scarce as keratinocyte cancers (KCs) are not captured by most registries. To address these gaps, we initiated the QSKIN Study in 2010 recruiting 43,794 Queensland residents from a population register (participation 24%). Participants self-completed a baseline survey recording information on residential history, sun exposure, phenotype and medical and family history...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329624/actinic-keratoses-progress-more-quickly-to-squamous-cell-carcinoma-than-basal-cell-carcinoma
#13
Julia A Siegal, Joanna L Walker, Moniyka Sachar, Robert A Lew, Suephy C Chen, Susan M Swetter, Robert P Dellavalle, George P Stricklin, Martin A Weinstock
Actinic keratoses (AK) are common, costly, and may evolve to keratinocyte carcinoma (KC): basal cell (BCC) and squamous cell carcinoma (SCC) of the skin. Time to malignant transformation is controversial. We used data from the placebo arm (n=166) of a randomized trial of veterans with multiple prior KCs. Study dermatologists examined participants' faces/ears at enrollment and semiannual visits. Clinically diagnosed AKs were marked, photographed, and treated with cryotherapy (starting at 6 months). Lesions suspicious for KC were marked, photographed, and biopsied...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28327271/novel-anti-staphylococcal-and-anti-biofilm-properties-of-two-anti-malarial-compounds-mmv665953-1-3-chloro-4-fluorophenyl-3-3-4-dichlorophenyl-urea-and-mmv665807-5-chloro-2-hydroxy-n-3-trifluoromethyl-phenyl-benzamide
#14
Marta Zapotoczna, Nabila Boksmati, Sinead Donohue, Baizurina Bahtiar, Ahmad Boland, Hamzah Al Somali, Alysia Cox, Hilary Humphreys, James P O'Gara, Marian Brennan, Eoghan O'Neill
PURPOSE: The treatment of device-related infections is challenging and current anti-microbial compounds have poor anti-biofilm activity. We aimed to identify and characterize novel compounds effective in the eradication of Staphylococcus aureus biofilms. METHODOLOGY: Two novel compounds, MMV665953 {1-(3-chloro-4-fluorophenyl)-3-(3,4-dichlorophenyl)urea} and MMV665807{5-chloro-2-hydroxy-N-[3-(trifluoromethyl)phenyl]benzamide}, effective in killing S. aureus biofilms, were identified by screening of the open access 'malaria box' chemical library...
March 23, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28326930/effects-of-jwh015-in-cytokine-secretion-in-primary-human-keratinocytes-and-fibroblasts-and-its-suitability-for-topical-transdermal-delivery
#15
Alicia Bort, Perla A Alvarado-Vazquez, Carolina Moracho-Vilrriales, Kristopher G Virga, Giuseppe Gumina, Alfonso Romero-Sandoval, Scott Asbill
Background JWH015 is a cannabinoid (CB) receptor type 2 agonist that produces immunomodulatory effects. Since skin cells play a key role in inflammatory conditions and tissue repair, we investigated the ability of JWH015 to promote an anti-inflammatory and pro-wound healing phenotype in human primary skin cells. Methods Human primary keratinocytes and fibroblasts were stimulated with lipopolysaccharide. The mRNA expression of cannabinoid receptors was determined using RT-PCR. The effects of JWH015 (0.05, 0...
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28326307/p75-neurotrophin-receptor-in-the-skin-beyond-its-neurotrophic-function
#16
REVIEW
Carlo Pincelli
p75 neurotrophin receptor (p75(NTR)), also known as CD271, is the low-affinity receptor that, together with the tyrosine kinase receptor tropomyosin-receptor kinase (Trk), mediate neurotrophin (NT) functions. Beside their classic role in skin innervation, NT and their receptors constitute a complex cutaneous network associated with a number of autocrine and paracrine activities. In this context, the role of p75(NTR) is becoming more and more important. This review will focus on the intriguing functions of p75(NTR) in healthy and diseased skin...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28325515/-a-new-case-of-rowell-s-syndrome
#17
C Schissler, S Banea, M-C Tortel, A Mahé
INTRODUCTION: This article introduces a new case of Rowell's syndrome, a controversial entity defined by the association of lupus erythematosus and erythema multiforme. OBSERVATION: A 43-year-old woman was diagnosed with lupus erythematosus induced by esomeprazole. Because her eruption did not improve after withdrawal of the drug, hydroxychloroquine was administered. Two weeks later, the patient described new annular lesions on her chest and arms, both erosive and crusted, and some had a target-like appearance...
March 18, 2017: Annales de Dermatologie et de Vénéréologie
https://www.readbyqxmd.com/read/28323859/diacerein-inhibits-the-pro-atherogenic-pro-inflammatory-effects-of-il-1-on-human-keratinocytes-endothelial-cells
#18
Girish C Mohan, Huayi Zhang, Lei Bao, Benjamin Many, Lawrence S Chan
We investigated IL-1-induced regulation of genes related to inflammation and atherogenesis in human keratinocytes and endothelial cells, and if 'diacerein', an oral IL-1 inhibiting drug currently approved for use in osteoarthritis, would reverse IL-1's effects on these cells. Primary human keratinocytes and coronary artery endothelial cells were treated with either IL-1α or IL-1β, with and without diacerein. Using PCR-array, we assessed differential gene-expression regulated by IL-1 and diacerein. We identified 34 pro-atherogenic genes in endothelial cells and 68 pro-inflammatory genes in keratinocytes significantly (p<0...
2017: PloS One
https://www.readbyqxmd.com/read/28322977/assessment-of-penetration-potential-of-ph-responsive-double-walled-biodegradable-nanogels-coated-with-eucalyptus-oil-for-the-controlled-delivery-of-5-fluorouracil-in-vitro-and-ex-vivo-studies
#19
Prashant Sahu, Sushil K Kashaw, Sanyog Jain, Samaresh Sau, Arun K Iyer
Penetration enhancers coated biodegradable polymeric nanogels loaded with cytotoxic drugs applied via the topical route, can be a promising strategy for improving the chemotherapeutic efficiency of skin cancers. The major objective of proposed research was to investigate the in vitro and ex vivo chemotherapeutic potential of double walled PLGA-chitosan biodegradable nanogel entrapped with 5-fluororuacil (5-FU) coated with eucalyptus oil, topically applied onto the skin. 5-FU was first entrapped in PLGA core by solvent evaporation technique followed by coating with cationic chitosan for ionic interaction with anionic skin cancer cell membrane...
March 17, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28322333/squamous-epitheliotropism-of-enterovirus-a71-in-human-epidermis-and-oral-mucosa
#20
Win Kyaw Phyu, Kien Chai Ong, Chee Kwan Kong, Abdul Khalil Alizan, Tindivanam Muthurangam Ramanujam, Kum Thong Wong
Hand-foot-and-mouth disease is a self-limiting paediatric infectious disease commonly caused by Enterovirus A71 (Genus: Enterovirus, Family: Picornaviridae). Typical lesions in and around the hands, feet, oral cavity and other places may rarely be complicated by acute flaccid paralysis and acute encephalomyelitis. Although virus is readily cultured from skin vesicles and oral secretions, the cellular target/s of Enterovirus A71 in human skin and oral mucosa are unknown. In Enterovirus A71-infected human skin and oral mucosa organotypic cultures derived from the prepuce and lip biopsies, focal viral antigens and viral RNA were localized to cytoplasm of epidermal and mucosal squamous cells as early as 2 days post-infection...
March 21, 2017: Scientific Reports
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