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https://www.readbyqxmd.com/read/28342848/ultraviolet-a-induced-oxidation-in-cornea-characterization-of-the-early-oxidation-related-events
#1
Corinne Zinflou, Patrick J Rochette
Exposure to sunlight ultraviolet-A (UVA), the main component of solar UV reaching the eyes, is suspected to play an important part in the onset of ocular pathologies. UVA primary biological deleterious effects arise from the photo-induction of oxidative stress in cells. However, the molecular bases linking UVA-induced oxidation to UVA toxicity in eyes remain poorly understood, especially with regards to the cornea. To shed some light on this issue, we have investigated the susceptibility and response potential of the different corneal cellular layers (epithelium, stroma and endothelium) to UVA-induced oxidation...
March 22, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28331171/accelerated-ecotoxicity-of-photoreactive-nanoparticles-on-moina-macrocopa
#2
Sun-Hwa Nam, Yu-Jin Shin, Youn-Joo An
Zinc oxide nanoparticles (ZnO NPs) and titanium dioxide nanoparticles (TiO2 NPs) are well known as photoreactive NPs. Various phototoxicity of ZnO NPs and TiO2 NPs on several organisms were reported. There was still necessity to evaluate toxicity of photoreactive ZnO NPs and TiO2 NPs due to species-specific effects under various irradiation conditions. We compared acute toxicity of Moina macrocopa under visible, UVA, and UVB irradiations, according to Organization for Economic Cooperation and Development guidelines for the testing of chemicals (Test No...
March 22, 2017: Environmental Health and Toxicology
https://www.readbyqxmd.com/read/28328945/mirnas-in-the-vitreous-humor-of-patients-affected-by-idiopathic-epiretinal-membrane-and-macular-hole
#3
Andrea Russo, Marco Ragusa, Cristina Barbagallo, Antonio Longo, Teresio Avitabile, Maurizio G Uva, Vincenza Bonfiglio, Mario D Toro, Rosario Caltabiano, Cesare Mariotti, Francesco Boscia, Mario Romano, Cinzia Di Pietro, Davide Barbagallo, Michele Purrello, Michele Reibaldi
PURPOSE: The aim of the present study was to assess the expression of miRNAs in the Vitreous Humor (VH) of patients with Macular Hole (MH) and Epiretinal Membrane (ERM) compared to a control group. METHODS: In this prospective, comparative study, 2-ml of VH was extracted from the core of the vitreous chamber in consecutive patients who underwent standard vitrectomy for ERM and MH. RNA was extracted and TaqMan® Low Density Arrays (TLDAs) were used to profile the transcriptome of 754 miRNAs...
2017: PloS One
https://www.readbyqxmd.com/read/28326067/uva-photoactivation-of-harmol-enhances-its-antifungal-activity-against-the-phytopathogens-penicillium-digitatum-and-botrytis-cinerea
#4
Gabriela M Olmedo, Luciana Cerioni, María M González, Franco M Cabrerizo, Sabrina I Volentini, Viviana A Rapisarda
Phytopathogenic fungi responsible for post-harvest diseases on fruit and vegetables cause important economic losses. We have previously reported that harmol (1-methyl-9H-pyrido[3,4-b]indol-7-ol) is active against the causal agents of green and gray molds Penicillium digitatum and Botrytis cinerea, respectively. Here, antifungal activity of harmol was characterized in terms of pH dependency and conidial targets; also photodynamic effects of UVA irradiation on the antimicrobial action were evaluated. Harmol was able to inhibit the growth of both post-harvest fungal disease agents only in acidic conditions (pH 5), when it was found in its protonated form...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28324951/mentor-s-brain-functional-connectivity-network-during-robotic-assisted-surgery-mentorship
#5
Somayeh B Shafiei, Scott T Doyle, Khurshid A Guru
In many complicated cognitive-motor tasks mentoring is inevitable during the learning process. Although mentors are expert in doing the task, trainee's operation might be new for a mentor. This makes mentoring a very difficult task which demands not only the knowledge and experience of a mentor, but also his/her ability to follow trainee's movements and patiently advise him/her during the operation. We hypothesize that information binding throughout the mentor's brain areas, contributed to the task, changes as the expertise level of the trainee improves from novice to intermediate and expert...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28323132/direct-participation-of-dna-in-the-formation-of-singlet-oxygen-and-base-damage-under-uva-irradiation
#6
Teiti Yagura, André Passaglia Schuch, Camila Carrião Machado Garcia, Clarissa Ribeiro Reily Rocha, Natália Cestari Moreno, José Pedro Friedmann Angeli, Davi Mendes, Divinomar Severino, Angelica Bianchini Sanchez, Paolo Di Mascio, Marisa Helena Gennari de Medeiros, Carlos Frederico Martins Menck
UVA light is hardly absorbed by the DNA molecule, but recent works point to a direct mechanism of DNA lesion by these wavelengths. UVA light also excite endogenous chromophores, which causes DNA damage through ROS. In this study, DNA samples were irradiated with UVA light in different conditions to investigate possible mechanisms involved in the induction of DNA damage. The different types of DNA lesions formed after irradiation were determined through the use of endonucleases, which recognize and cleave sites containing oxidized bases and cyclobutane pyrimidine dimers (CPDs), as well as through antibody recognition...
March 18, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28317527/phototherapy-and-combination-therapies-for-vitiligo
#7
REVIEW
Samia Esmat, Rehab A Hegazy, Suzan Shalaby, Stephen Chu-Sung Hu, Cheng-Che E Lan
Vitiligo is a disease characterized by disappearance of melanocytes from the skin. It can negatively influence the physical appearance of affected individuals, and may profoundly affect a person's psychosocial function and quality of life. Therefore, vitiligo should not be considered as merely a condition that affects a patient's appearance, but needs to be actively treated in patients who seek medical help. Phototherapy has been used as the main treatment modality for patients with vitiligo. Different forms of phototherapy for vitiligo include broadband UVB, narrowband UVB, excimer light and excimer laser, and psoralen plus UVA...
April 2017: Dermatologic Clinics
https://www.readbyqxmd.com/read/28315514/optic-nerve-head-in-central-retinal-vein-occlusion-by-spectral-domain-oct
#8
Antonio Longo, Teresio Avitabile, Maurizio G Uva, Vincenza Bonfiglio, Andrea Russo, Mario D Toro, Caterina Gagliano, Matteo Fallico, Michele Reibaldi
PURPOSE: To evaluate the morphology of optic nerve head by spectral-domain optical coherence tomography (SD-OCT) in patients with unilateral central retinal vein occlusion (CRVO). METHODS: In 39 consecutive patients with unilateral CRVO and 39 healthy controls, morphologic parameters of optic nerve head were assessed in both eyes by Spectralis SD-OCT using a custom radial B-scan pattern. The length of Bruch membrane opening (BMO) was measured in OCT scans, and optic disc diameters (DD) were assessed in infrared fundus photographs...
February 28, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28315451/blue-light-induced-oxidative-stress-in-live-skin
#9
Yuya Nakashima, Shigeo Ohta, Alexander M Wolf
Skin damage from exposure to sunlight induces aging-like changes in appearance and is attributed to the ultraviolet (UV) component of light. Photosensitized production of reactive oxygen species (ROS) by UVA light is widely accepted to contribute to skin damage and carcinogenesis, but visible light is thought not to do so. Using mice expressing redox-sensitive GFP to detect ROS, blue light could produce oxidative stress in live skin. Blue light induced oxidative stress preferentially in mitochondria, but green, red, far red or infrared light did not...
March 15, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28304067/lipid-remodelling-in-human-melanoma-cells-in-response-to-uva-exposure
#10
Elisabete Maciel, Juliana Felgueiras, Eduarda M P Silva, Fernando Ricardo, Ana S P Moreira, Tânia Melo, Ana Campos, Margarida Fardilha, Pedro Domingues, M Rosário Domingues
Extensive exposure to UVA is thought to increase the risk of malignancy and the progression of melanoma, the most serious type of skin cancer. It is well known that alterations in lipid metabolism represent an early event in carcinogenesis, but the impact of UVA exposure on the lipid composition of cancer cells is still largely unknown. In this study we aimed at investigating lipid remodeling in human melanoma cells in response to UVA exposure. After UVA irradiation, lipid extracts were either immediately collected from SK-MEL-28 cells or collected after a recovery period of 2 h or 24 h...
March 17, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28303596/the-phototoxic-potential-of-the-flavonoids-taxifolin-and-quercetin
#11
Alena Rajnochová Svobodová, Alena Ryšavá, Michaela Psotová, Pavel Kosina, Bohumil Zálešák, Jitka Ulrichová, Jitka Vostálová
Quercetin, one of the most abundant polyphenols in the plant kingdom has been shown to be photodegraded on exposure to UV light. Despite the fact, it is a component of several dermatological preparations. Its phototoxic potential has not been evaluated to date. The aim of this study was to assess whether photo-induced degradation of quercetin is linked to phototoxic effects on living cells. Its dihydro derivative, taxifolin was included in the study. For evaluation, the 3T3 Neutral Red Uptake Phototoxicity Test according to OECD TG 432, was used...
March 16, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28301979/short-time-uva-exposure-to-human-keratinocytes-instigated-polyunsaturated-fatty-acid-without-inducing-lipid-peroxidation
#12
Kin Sum Leung, Hok Fung Chan, Ho Hang Leung, Jean-Marie Galano, Camille Oger, Thierry Durand, Jetty Chung-Yung Lee
Short-term exposure to ultraviolet A (UVA) radiation can directly injure our skin through inflammatory response and indirectly through oxidative stress, triggering polyunsaturated fatty acid (PUFA) peroxidation in skin cell membrane and formation of DNA adduct, 8-hydroxy-2'-deoxyguanosine (8-OHdG). It is known that UVA exposure leads to photoaging, immunosuppression and skin cancer. However, the changes in PUFA and its oxidized metabolites, and cell cycle after short UVA exposure, are debatable. In this study, human keratinocytes (HaCaT) were exposed to low dose (5 J/cm(2)) and high dose (20 J/cm(2)) of UVA and assessed immediately, 8 h, 12 h, and 24 h post-treatment...
March 17, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28297026/biomechanical-changes-after-in-vivo-collagen-cross-linking-with-rose-bengal-green-light-and-riboflavin-uva
#13
Nandor Bekesi, Patricia Gallego-Muñoz, Lucía Ibarés-Frías, Pablo Perez-Merino, M Carmen Martinez-Garcia, Irene E Kochevar, Susana Marcos
Purpose: To compare corneal biomechanical properties after in vivo and ex vivo cross-linking (CXL) using rose bengal-green light (RGX) or riboflavin-UVA (UVX). Methods: Corneas of 30 rabbits were treated in vivo by the two CXL modalities monolaterally (Group 1) or bilaterally (Group 2). Rabbits in Group 1 were euthanized 1 month after treatments and in Group 2 two months after treatment. Ex vivo CXL was also performed. Eyes were measured by Scheimpflug air puff corneal deformation imaging (Corvis ST) under constant IOP...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28292349/distribution-of-facial-exposure-to-non-melanoma-biologically-effective-uv-irradiance-changes-by-rotation-angles
#14
Xu Yan, Zhong Fang Shi, Li Xin Xu, Jia Xin Li, Min Wu, Xiao Xuan Wang
OBJECTIVE: To show the distribution of facial exposure to non-melanoma biologically effective UV irradiance changes by rotation angles. METHODS: This study selected the cheek, nose, and forehead as representative facial sites for UV irradiance measurements, which were performed using a rotating manikin and a spectroradiometer. The measured UV irradiance was weighted using action spectra to calculate the biologically effective UV irradiances that cause non-melanoma (UVBEnon-mel) skin cancer...
February 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/28287037/uva-radiation-augments-cytotoxic-activity-of-psoralens-in-melanoma-cells
#15
Dorota Wrześniok, Artur Beberok, Jakub Rok, Marcin Delijewski, Anna Hechmann, Martyna Oprzondek, Zuzanna Rzepka, Barbara Bacler-Żbikowska, Ewa Buszman
PURPOSE: Melanoma is an aggressive form of skin cancer. The aim of the study was to evaluate the influence of UVA radiation and psoralens: 5-methoxypsoralen (5-MOP) or 8-methoxypsoralen (8-MOP) on melanoma cells viability. MATERIALS AND METHODS: The amelanotic C32 and melanotic COLO829 human melanoma cell lines were exposed to increasing concentrations of psoralens (0.1-100 μM) in the presence or absence of UVA radiation. Cell viability was evaluated by the WST-1 assay...
March 13, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28286269/circular-rna-profiling-reveals-that-circcol3a1-859267-regulate-type-i-collagen-expression-in-photoaged-human-dermal-fibroblasts
#16
Yating Peng, Xiaojing Song, Yue Zheng, Xinyi Wang, Wei Lai
Production of type I collagen declines is a main characteristic during photoaging, but the mechanism is still not fully understood. Circular RNAs (circRNAs) are a class of newly identified non-coding RNAs with regulatory potency by sequestering miRNAs like a sponge. It's more stable than linear RNAs, and would be a useful tool for regulation of gene expression. However, the role of circRNAs in collagen expression during photoaging is still unclear. Here we performed deep sequencing of RNA generated from UVA irradiated and no irradiated human dermal fibroblasts (HDFs) and identified 29 significantly differentially expressed circRNAs (fold change ≥ 1...
March 9, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28285367/comparison-of-protective-effect-of-ascorbic-acid-on-redox-and-endocannabinoid-systems-interactions-in-in-vitro-cultured-human-skin-fibroblasts-exposed-to-uv-radiation-and-hydrogen-peroxide
#17
Agnieszka Gęgotek, Katarzyna Bielawska, Michał Biernacki, Ilona Zaręba, Arkadiusz Surażyński, Elżbieta Skrzydlewska
The mechanisms of biological activity of commonly used natural compounds are constantly examined. Therefore, the aim of this study was to compare ascorbic acid efficacy in counteracting the consequences of UV and hydrogen peroxide treatment on lipid mediators and their regulative action on antioxidant abilities. Skin fibroblasts exposed to UVA and UVB irradiation, treated with hydrogen peroxide and ascorbic acid. The redox system was estimated through reactive oxygen species (ROS) generation (electron spin resonance spectrometer) and antioxidants level/activity (HPLC/spectrometry) which activity was evaluated by the level of phospholipid metabolites: 4-hydroxynonenal, malondialdehyde, 8-isoprostanes and endocannabinoids (GC/LC-MS) in the human skin fibroblasts...
March 11, 2017: Archives of Dermatological Research
https://www.readbyqxmd.com/read/28283174/real-time-rula-assessment-using-kinect-v2-sensor
#18
Vito Modesto Manghisi, Antonio Emmanuele Uva, Michele Fiorentino, Vitoantonio Bevilacqua, Gianpaolo Francesco Trotta, Giuseppe Monno
The evaluation of the exposure to risk factors in workplaces and their subsequent redesign represent one of the practices to lessen the frequency of work-related musculoskeletal disorders. In this paper we present K2RULA, a semi-automatic RULA evaluation software based on the Microsoft Kinect v2 depth camera, aimed at detecting awkward postures in real time, but also in off-line analysis. We validated our tool with two experiments. In the first one, we compared the K2RULA grand-scores with those obtained with a reference optical motion capture system and we found a statistical perfect match according to the Landis and Koch scale (proportion agreement index = 0...
March 7, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28278487/meal-detection-and-carbohydrate-estimation-using-continuous-glucose-sensor-data
#19
Sediqeh Samadi, Kamuran Turksoy, Iman Hajizadeh, Jianyuan Feng, Mert Sevil, Ali Cinar
A meal detection and meal size estimation algorithm is developed for use in artificial pancreas (AP) control systems for people with type 1 diabetes. The algorithm detects the consumption of a meal and estimates its carbohydrate (CHO) amount to determine the appropriate dose of insulin bolus for a meal. It can be used in AP systems without manual meal announcements, or as a safety feature for people who may forget entering meal information manually. Using qualitative representation of the filtered continuous glucose monitor signal, a time period labeled as meal flag is identified...
March 3, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28272309/determination-of-the-clean-air-delivery-rate-cadr-of-photocatalytic-oxidation-pco-purifiers-for-indoor-air-pollutants-using-a-closed-loop-reactor-part-ii-experimental-results
#20
Valérie Héquet, Frédéric Batault, Cécile Raillard, Frédéric Thévenet, Laurence Le Coq, Éric Dumont
The performances of a laboratory PhotoCatalytic Oxidation (PCO) device were determined using a recirculation closed-loop pilot reactor. The closed-loop system was modeled by associating equations related to two ideal reactors: a perfectly mixed reservoir with a volume of VR = 0.42 m³ and a plug flow system corresponding to the PCO device with a volume of VP = 5.6 × 10(-3) m³. The PCO device was composed of a pleated photocatalytic filter (1100 cm²) and two 18-W UVA fluorescent tubes. The Clean Air Delivery Rate (CADR) of the apparatus was measured under different operating conditions...
March 6, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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