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https://www.readbyqxmd.com/read/29241156/incidence-of-cutaneous-malignant-melanoma-in-iranian-provinces-and-american-states-matched-on-ultraviolet-radiation-exposure-an-ecologic-study
#1
Roxana Moslehi, Nur Zeinomar, Francis P Boscoe
OBJECTIVES: Ultraviolet radiation (UVR), with UVB and UVA as the relevant components, is a risk factor for melanoma. Complete ascertainment and registration of melanoma in Iran was conducted in five provinces (Ardabil, Golestan, Mazandaran, Gilan and Kerman) during 1996-2000. The aim of our study was to compare population-based incidence data from these provinces with rates in the United States (US) while standardizing ambient UVR. METHODS: Population-based rates representing all incident cases of melanoma (1996-2000) across the five Iranian provinces were compared to rates of melanoma among white non-Hispanics in the US...
December 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29237811/long-term-uvb-exposure-promotes-predator-inspection-behaviour-in-a-fish
#2
Simon Vitt, Janina E Zierul, Theo C M Bakker, Ingolf P Rick
Ultraviolet-B radiation (UVB) reaching the earth's surface has increased due to human-caused stratospheric ozone depletion. Whereas the harmful effects of UVB on aquatic organisms are well studied at the molecular and cellular level, recent studies have also begun to address behavioural changes caused by sublethal amounts of UVB. However, the behavioural consequences of long-term exposure to ecologically relevant UVB levels over several life stages are virtually unknown, particularly with regard to predator-prey behaviour...
December 2017: Biology Letters
https://www.readbyqxmd.com/read/29235664/an-observer-blinded-randomised-controlled-pilot-trial-comparing-localised-immersion-psoralen-ultraviolet-a-puva-with-localised-narrowband-ultraviolet-b-nbuvb-for-the-treatment-of-palmar-hand-eczema
#3
D Brass, T Fouweather, D D Stocken, C Macdonald, J Wilkinson, J Lloyd, P M Farr, N J Reynolds, P J Hampton
BACKGROUND: Hand eczema is a common inflammatory dermatosis that causes significant patient morbidity. Symptoms such as pain, itch and localised swelling contribute to disruption of activities of daily living, lack of sleep, and missed days from work. The aetiology is often multifactorial. Previous studies comparing psoralen ultraviolet A (PUVA) and narrowband ultraviolet B (NBUVB) have been small, non-randomised and retrospective. OBJECTIVES: To conduct an observer blinded randomized controlled pilot study using validated scoring criteria to compare immersion PUVA with NBUVB for the treatment of chronic hand eczema unresponsive to topical steroids...
December 13, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/29235163/ultraviolet-b-eye-irradiation-aggravates-atopic-dermatitis-via-acth-and-nlrp3-inflammasome-in-nc-nga-mice
#4
Keiichi Hiramoto, Yurika Yamate, Satoshi Yokoyama
BACKGROUND: Ultraviolet (UV) B irradiation has been shown to improve atopic dermatitis (AD). However, the relationship between UVB eye irradiation and AD is not known. This issue was addressed using a mouse model of AD. METHODS: The eyes of NC/Nga mice were irradiated with UVB at a dose of 1.0 kJ/m2 using a 20SE sunlamp for the duration of the experimental period. RESULTS: AD symptoms deteriorated upon UVB eye irradiation. The levels of adrenocorticotropic hormone (ACTH) in the plasma and nucleotide-binding domain and leucine-rich-containing family, pyrin domain-containing (NLRP)3 and neutrophil markers in the skin were increased in UVB-irradiated mice...
December 13, 2017: Photodermatology, Photoimmunology & Photomedicine
https://www.readbyqxmd.com/read/29232646/determination-of-uv-filters-in-human-breast-milk-using-turbulent-flow-chromatography-and-babies-daily-intake-estimation
#5
Daniel Molins-Delgado, María Del Mar Olmo-Campos, Gemma Valeta-Juan, Vanessa Pleguezuelos-Hernández, Damià Barceló, M Silvia Díaz-Cruz
UV filters (UV-Fs) are a group of hormonally active chemical compounds used to protect against the deleterious effects of UVA and UVB solar radiation, which are currently present in most consumer goods (personal care products, plastics, fabrics, paints, etc). Last years the concern about these emerging contaminants has been on the rise, and increasing efforts are being taken in order to properly asses the hazard that the exposure to these compounds in the early stages of life may pose. In this study, a new method for the analysis of 11 UV-Fs residues in human breast milk samples has been developed...
December 9, 2017: Environmental Research
https://www.readbyqxmd.com/read/29231753/rates-of-insufficiency-and-deficiency-of-vitamin-d-levels-in-elite-professional-male-and-female-skiers-a-chronobiologic-approach
#6
Jacopo Antonino Vitale, Giovanni Lombardi, Luca Cavaleri, Rosa Graziani, Herbert Schoenhuber, Antonio La Torre, Giuseppe Banfi
Vitamin D is essential for the maintenance and promotion of musculoskeletal health, for the functioning of the immune, cardiovascular and reproductive systems, and its main action is to keep calcium and phosphate plasmatic physiological concentrations at intestinal, renal and bony level. Vitamin D affects several parameters related to physical performance too and a particularly high percentage of vitamin D insufficiency and deficiency in professional athletes has been observed. Several variables are able to impair the synthesis of 25(OH)D in athletes, specifically both genetic and environmental factors, but the most probable explanation for the deficient/insufficient vitamin D levels is the insufficient ultraviolet B light (UVB) exposure during winter...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29229447/hnrnp-a1-promotes-keratinocyte-cell-survival-post-uvb-radiation-through-pi3k-akt-mtor-pathway
#7
Jianguo Feng, Yi Liao, Xichao Xu, Qian Yi, Ling He, Liling Tang
hnRNP A1 acts as a critical splicing factor in regulating many alternative splicing events in various physiological and pathophysiological progressions. hnRNP A1 is capable of regulating UVB-induced hdm2 gene alternative splicing according to our previous study. However, the biological function and underlying molecular mechanism of hnRNP A1 in cell survival and cell cycle in response to UVB irradiation are still unclear. In this study, silencing hnRNP A1 expression by siRNA transfection led to decreased cell survival after UVB treatment, while promoting hnRNP A1 by lentiviruse vector resulted in increased cell survival...
December 8, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/29228682/epidermal-ppar%C3%AE-influences-subcutaneous-tumor-growth-and-acts-through-tnf-%C3%AE-to-regulate-contact-hypersensitivity-and-the-acute-photoresponse
#8
Raymond L Konger, Ethel Derr-Yellin, Jeffrey B Travers, Jesus A Ocana, Ravi P Sahu
It is known that ultraviolet B (UVB) induces PPARγ ligand formation while loss of murine epidermal PPARγ (Pparg-/-epi) promotes UVB-induced apoptosis, inflammation, and carcinogenesis. PPARγ is known to suppress tumor necrosis factor-α (TNF-α) production. TNF-α is also known to promote UVB-induced inflammation, apoptosis, and immunosuppression. We show that Pparg-/-epi mice exhibit increased baseline TNF-α expression. Neutralizing Abs to TNF-α block the increased photo-inflammation and photo-toxicity that is observed in Pparg-/-epi mouse skin...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29223142/designing-tyrosinase-sirnas-by-multiple-prediction-algorithms-and-evaluation-of-their-anti-melanogenic-effects
#9
Ok-Seon Kwon, Soo-Jung Kwon, Jin Sang Kim, Gunbong Lee, Han-Joo Maeng, Jeongmi Lee, Gwi Seo Hwang, Hyuk-Jin Cha, Kwang-Hoon Chun
Melanin is a pigment produced from tyrosine in melanocytes. Although melanin has a protective role against UVB radiation-induced damage, it is also associated with the development of melanoma and darker skin tone. Tyrosinase is a key enzyme in melanin synthesis, which regulates the rate-limiting step during conversion of tyrosine into DOPA and dopaquinone. To develop effective RNA interference therapeutics, we designed a melanin siRNA pool by applying multiple prediction programs to reduce human tyrosinase levels...
December 8, 2017: Biomolecules & Therapeutics
https://www.readbyqxmd.com/read/29221146/swertiajaponin-inhibits-skin-pigmentation-by-dual-mechanisms-to-suppress-tyrosinase
#10
Bonggi Lee, Kyoung Mi Moon, Bong-Seon Lee, Ju-Hye Yang, Kwang Il Park, Won-Kyung Cho, Jin Yeul Ma
Many skin-whitening compounds target tyrosinase because it catalyzes two rate-limiting steps in melanin synthesis. Although many tyrosinase inhibitors are currently available for a skin-whitening purpose, undesirable adverse effects are also reported. Thus, numerous efforts have been made to develop safer tyrosinase inhibitors from natural products. In line with this, we tested fifty flavonoids, a group of naturally occurring antioxidants and metal chelators, and screened swertiajaponin as the strongest tyrosinase inhibitor in cell-free experiments...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29215572/development-of-octyl-methoxy-cinnamates-omc-silicon-dioxide-sio%C3%A2-nanoparticles-by-sol-gel-emulsion-method
#11
Pey-Shiuan Wu, Yi-Ching Lee, Yi-Ching Kuo, Chih-Chien Lin
Although octyl methoxy cinnamates (OMC) is the most used Ultraviolet B (UVB) filter in sunscreen, it has poor light stability in emulsion system. In this study, OMC/SiO₂ nanoparticles were prepared via sol-gel emulsion method. Tetraethoxy silane (TEOS) was used as the silica source to encapsulate OMC. Modification of experimental parameters such as stirring speed of condensation reaction and emulsion condition, pH value of acid-catalyzed, surfactant and different percentage of TEOS and OMC, adding of OMC and surfactant to different phase may affect the particle size, and yield and entrapment efficiency in preparation process of OMC/SiO₂ nanoparticles...
December 7, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29213352/echinacoside-alleviates-uvb-irradiation-mediated-skin-damage-via-inhibition-of-oxidative-stress-dna-damage-and-apoptosis
#12
Di Zhang, Chengtao Lu, Zhe Yu, Xiayin Wang, Li Yan, Juanli Zhang, Hua Li, Jianbo Wang, Aidong Wen
Ultraviolet B (UVB) irradiation has been known to cause skin damage, which is associated with oxidative stress, DNA damage, and apoptosis. Echinacoside is a phenylethanoid glycoside isolated from Herba Cistanches, which exhibits strong antioxidant activity. In this study, we evaluate the photoprotective effect of echinacoside on UVB-induced skin damage and explore the potential molecular mechanism. BALB/c mice and HaCaT cells were treated with echinacoside before UVB exposure. Histopathological examination was used to evaluate the skin damage...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29210489/effects-of-temperature-and-photorepair-radiation-on-a-marine-ciliate-exposed-to-uvb-radiation
#13
Sarah E Hamsher, Cheng Yun Tina Sung, Robert W Sanders
The influences of intensity and repeated exposure to ultraviolet-B radiation (UVB), photoreactivating repair radiation (PRR), and temperature on the scuticociliate Parauronema acutum were explored under laboratory conditions. Population growth was negatively affected after exposure to the equivalent of one sunny summer day of ambient UVB, especially in the absence of PRR. Repeated daily exposure to UVB severely compromised ciliate survival. UVB-exposed treatments without PRR recovered slower and reached lower final abundances than treatments receiving PRR...
December 6, 2017: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/29207596/uvb-induced-nuclear-translocation-of-tc-ptp-by-akt-14-3-3%C3%AF-axis-inhibits-keratinocyte-survival-and-proliferation
#14
Mihwa Kim, Liza D Morales, Minwoo Baek, Thomas J Slaga, John DiGiovanni, Dae Joon Kim
Understanding protein subcellular localization is important to determining the functional role of specific proteins. T-cell protein tyrosine phosphatase (TC-PTP) contains bipartite nuclear localization signals (NLSI and NLSII) in its C-terminus. We previously have demonstrated that the nuclear form of TC-PTP (TC45) is mainly localized to the cytoplasm in keratinocytes and it is translocated to the nucleus following UVB irradiation. Here, we report that TC45 is translocated by an AKT/14-3-3σ-mediated mechanism in response to UVB exposure, resulting in increased apoptosis and decreased keratinocyte proliferation...
October 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/29205369/regulatory-b-cells-induced-by-ultraviolet-b-through-toll-like-receptor-4-signalling-contribute-to-the-suppression-of-contact-hypersensitivity-responses-in-mice
#15
Xiaoming Liu, Haiyan Huang, Hongbin Gao, Xia Wu, Wei Zhang, Bo Yu, Xia Dou
BACKGROUND: Ultraviolet (UV) B irradiation is known to suppress contact hypersensitivity (CHS) responses in mouse models by suppressing immune responses. However, the cellular mechanisms responsible for UVB-induced systemic suppression remain unclear. Regulatory B cells have been reported to play an inhibitory role during CHS. It is presently unknown whether regulatory B cells contribute to the effect of UVB phototherapy. OBJECTIVE: To investigate the inductive effect of UVB on regulatory B cells and the underlying mechanisms by using a CHS mouse model...
December 5, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/29199612/involvement-of-different-genes-expressions-during-immunological-and-inflammatory-responses-in-vitiligo
#16
Chandra Kant Sharma, Monika Sharma, Kanika Prasad
Vitiligo is a condition of the skin distinguished by hypo-pigmentation. Etiology of this disorder is unknown, and several theories and mechanisms have been hypothesized. The inflammatory response in vitiligo is thought to be mediated by polymorphism in genes such as FOXP3, ACE, APE, GSTP1, TLR, SOD, CTLA-4, TAP/LMP gene cluster, etc. Theories including reactive oxygen species model, Nrf2-antioxidant response element (ARE) pathway, WNT pathway, tyrosinase activity, biochemical, molecular, and cellular alterations have been hypothesized to explain vitiligo pathogenesis...
2017: Critical Reviews in Eukaryotic Gene Expression
https://www.readbyqxmd.com/read/29199351/significant-changes-in-the-skin-microbiome-in-patients-with-chronic-plaque-psoriasis-after-treatment-with-narrowband-ultraviolet-b
#17
Malin Assarsson, Albert Duvetorp, Olaf Dienus, Jan Söderman, Oliver Seifert
Changes in the skin microbiome have been shown to promote cutaneous inflammation. The skin microbiome of patients with chronic plaque type psoriasis was analysed before and after treatment with narrowband ultraviolet B (UVB). Swab samples of the microbiome were taken from lesional and non-lesional skin of 26 patients. Microbiotas were characterized by sequencing 16S rRNA bacterial genes on the Illumina MiSeq platform. Lesional skin microbiome diversity correlated with psoriasis severity (measured with the Psoriasis Area and Severity Index; PASI)...
December 4, 2017: Acta Dermato-venereologica
https://www.readbyqxmd.com/read/29197551/allelic-variants-of-the-aryl-hydrocarbon-receptor-differentially-influence-uvb-mediated-skin-inflammatory-responses-in-skh1-mice
#18
Kayla J Smith, Iain A Murray, Jacob A Boyer, Gary H Perdew
The mouse strain SKH1 is widely used in skin research due to its hairless phenotype and intact immune system. Due to the complex nature of aryl hydrocarbon receptor (AHR) function in the skin, the development of additional in vivo models is necessary to study its role in cutaneous homeostasis and pathology. Variants of the Ah allele, exist among different mouse strains. The Ahb-1 and Ahd alleles express high and low affinity ligand binding forms of the AHR, respectively. The outbred SKH1 mice express the Ahb-2 and/or Ahd alleles...
November 29, 2017: Toxicology
https://www.readbyqxmd.com/read/29197334/identification-and-characterization-of-prunus-persica-mirnas-in-response-to-uvb-radiation-in-greenhouse-through-high-throughput-sequencing
#19
Shaoxuan Li, Zhanru Shao, Xiling Fu, Wei Xiao, Ling Li, Ming Chen, Mingyue Sun, Dongmei Li, Dongsheng Gao
BACKGROUND: MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression of target mRNAs involved in plant growth, development, and abiotic stress. As one of the most important model plants, peach (Prunus persica) has high agricultural significance and nutritional values. It is well adapted to be cultivated in greenhouse in which some auxiliary conditions like temperature, humidity, and UVB etc. are needed to ensure the fruit quality. However, little is known about the genomic information of P...
December 2, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29190285/the-interplay-of-uv-and-cutaneous-papillomavirus-infection-in-skin-cancer-development
#20
Daniel Hasche, Sonja Stephan, Ilona Braspenning-Wesch, Julita Mikulec, Martina Niebler, Hermann-Josef Gröne, Christa Flechtenmacher, Baki Akgül, Frank Rösl, Sabrina E Vinzón
Cutaneous human papillomaviruses (HPVs) are considered as cofactors for non-melanoma skin cancer (NMSC) development, especially in association with UVB. Extensively studied transgenic mouse models failed to mimic all aspects of virus-host interactions starting from primary infection to the appearance of a tumor. Using the natural model Mastomys coucha, which reflects the human situation in many aspects, we provide the first evidence that only UVB and Mastomys natalensis papillomavirus (MnPV) infection strongly promote NMSC formation...
November 2017: PLoS Pathogens
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