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retina, macular degeneration

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https://www.readbyqxmd.com/read/28104803/microrna-processing-enzymes-are-essential-for-survival-and-function-of-mature-retinal-pigmented-epithelial-cells-in-mice
#1
Thomas R Sundermeier, Sanae Sakami, Bhubanananda Sahu, Scott J Howell, Songqi Gao, Zhiqian Dong, Marcin Golczak, Akiko Maeda, Krzysztof Palczewski
Age-related macular degeneration (AMD) is a major cause of irreversible vision loss. The neovascular or "wet" form of AMD can be treated to a varying degree with anti-angiogenic drugs, but geographic atrophy (GA) is an advanced stage of the more prevalent "dry" form of AMD for which there is no effective treatment. Development of GA has been linked to loss of the microRNA (miRNA)-processing enzyme DICER1 in the mature retinal pigmented epithelium (RPE). This loss results in the accumulation of toxic transcripts of Alu transposable elements which activate the NLRP3 inflammasome and additional downstream pathways that compromise the integrity and function of the RPE...
January 19, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28101418/multi-surface-segmentation-of-oct-images-with-amd-using-sparse-high-order-potentials
#2
Jorge Oliveira, Sérgio Pereira, Luís Gonçalves, Manuel Ferreira, Carlos A Silva
In age-related macular degeneration (AMD), the quantification of drusen is important because it is correlated with the evolution of the disease to an advanced stage. Therefore, we propose an algorithm based on a multi-surface framework for the segmentation of the limiting boundaries of drusen: the inner boundary of the retinal pigment epithelium + drusen complex (IRPEDC) and the Bruch's membrane (BM). Several segmentation methods have been considerably successful in segmenting retinal layers of healthy retinas in optical coherence tomography (OCT) images...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28092911/behaviour-of-cd11b-positive-cells-in-an-animal-model-of-laser-induced-choroidal-neovascularisation
#3
Lu Li, Peter Heiduschka, Anne F Alex, Daniel Niekämper, Nicole Eter
BACKGROUND/AIM: Immune cells, e.g. microglial cells of the retina, appear to be involved in pathological processes in neovascular age-related macular degeneration. Therefore, the purpose of this study was to immunohistochemically check the expression of various factors and cytokines by CD11b-positive (CD11b+) immune cells in an animal model of choroidal neovascularisation (CNV). METHODS: We used the animal model of laser-induced CNV in mice. Eyes were isolated at 1, 4, 7, and 14 days after laser treatment...
January 17, 2017: Ophthalmologica. Journal International D'ophtalmologie
https://www.readbyqxmd.com/read/28089680/peripheral-retinal-changes-associated-with%C3%A2-age-related-macular-degeneration-in%C3%A2-the-age-related-eye-disease-study-2-age-related-eye-disease-study-2-report-number-12-by-the%C3%A2-age-related-eye-disease-study-2-optos-peripheral-retina-opera-study-research-group
#4
Amitha Domalpally, Traci E Clemons, Ronald P Danis, SriniVas R Sadda, Catherine A Cukras, Cynthia A Toth, Thomas R Friberg, Emily Y Chew
PURPOSE: To compare rates of peripheral retinal changes in Age-Related Eye Disease Study 2 (AREDS2) participants with at least intermediate age-related macular degeneration (AMD) with control subjects without intermediate age-related changes (large drusen). DESIGN: Cross-sectional evaluation of clinic-based patients enrolled in AREDS2 and a prospective study. PARTICIPANTS: Participants from prospective studies. METHODS: The 200° pseudocolor and fundus autofluorescence (FAF) images were captured on the Optos 200 Tx Ultrawide-field device (Optos, Dunfermline, Scotland) by centering on the fovea and then steering superiorly and inferiorly...
January 12, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28086806/age-related-macular-degeneration-associated-polymorphism-rs10490924-in-arms2-results-in-deficiency-of-a-complement-activator
#5
Sven Micklisch, Yuchen Lin, Saskia Jacob, Marcus Karlstetter, Katharina Dannhausen, Prasad Dasari, Monika von der Heide, Hans-Martin Dahse, Lisa Schmölz, Felix Grassmann, Medhanie Alene, Sascha Fauser, Harald Neumann, Stefan Lorkowski, Diana Pauly, Bernhard H Weber, Antonia M Joussen, Thomas Langmann, Peter F Zipfel, Christine Skerka
BACKGROUND: Age-related macular degeneration (AMD) is the leading cause of blindness in developed countries. The polymorphism rs10490924 in the ARMS2 gene is highly associated with AMD and linked to an indel mutation (del443ins54), the latter inducing mRNA instability. At present, the function of the ARMS2 protein, the exact cellular sources in the retina and the biological consequences of the rs10490924 polymorphism are unclear. METHODS: Recombinant ARMS2 was expressed in Pichia pastoris, and protein functions were studied regarding cell surface binding and complement activation in human serum using fluoresence-activated cell sorting (FACS) as well as laser scanning microscopy (LSM)...
January 5, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28079756/optical-coherence-tomography-angiography-changes-in-early-type-3-neovascularization-after-anti-vascular-endothelial-growth-factor-treatment
#6
Alexandra Miere, Giuseppe Querques, Oudy Semoun, Francesca Amoroso, Olivia Zambrowski, Thibaut Chapron, Vittorio Capuano, Eric H Souied
PURPOSE: To investigate the morphologic changes on optical coherence tomography angiography (OCTA) of treatment-naive Type 3 neovascularization secondary to exudative age-related macular degeneration after 1 year of anti-vascular endothelial growth factor therapy. METHODS: Consecutive patients diagnosed with treatment-naive early-stage Type 3 neovascularization were enrolled in this retrospective study. All patients underwent color fundus photographs/MultiColor (Heidelberg Engineering) imaging, fluorescein angiography, indocyanine green angiography, structural spectral domain OCT, and OCTA Optovue RTVue XR Avanti (Optovue) at baseline, and repeated OCTA and structural spectral domain OCT at Month 12...
January 10, 2017: Retina
https://www.readbyqxmd.com/read/28078992/smoking-and-eye-pathologies-a-systemic-review-part-ii-retina-diseases-uveitis-optic-neuropathies-thyroid-associated-orbitopathy
#7
Małgorzata Nita, Andrzej Grzybowski
BACKGROUND: Tobacco smoking has detrimental influence on human health. AIM: The analysis of influence of tobacco smoking on retina diseases, uveitis, optic neuropathies, and thyroid-associated orbitopathy in adults and children. METHODS: A comprehensive review of the literature performed through MEDLINE and PubMed searches, covering the years 2000-2016. RESULTS: In adults, tobacco smoking is a strong risk factor for age-related macular degeneration, polypoidal choroidal vasculopathy, uveitis and inflamed cystoid macular edema as well as Grave`s ophthalmopathy...
January 10, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28058163/clinical-features-and-course-of-patients-with-peripheral-exudative-hemorrhagic-chorioretinopathy
#8
Zafer Cebeci, Yasemin Dere, Şerife Bayraktar, Samuray Tuncer, Nur Kır
OBJECTIVES: To evaluate the clinical characteristics of patients who were followed in our clinic with the diagnosis of peripheral exudative hemorrhagic chorioretinopathy (PEHC). MATERIALS AND METHODS: Medical records of 12 patients who were diagnosed with PEHC in İstanbul University İstanbul Faculty of Medicine, Department of Ophthalmology between July 2006 and June 2014 were reviewed retrospectively. RESULTS: This study included 21 eyes of 12 patients...
October 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28057649/choroid-morphometric-analysis-in-non-neovascular-age-related-macular-degeneration-by-means-of-optical-coherence-tomography-angiography
#9
Maria Vittoria Cicinelli, Alessandro Rabiolo, Alessandro Marchese, Luigi de Vitis, Adriano Carnevali, Lea Querques, Francesco Bandello, Giuseppe Querques
AIMS: To describe the vascular changes in patients affected by non-neovascular age-related macular degeneration (AMD), featuring reticular pseudodrusen (RPD), drusen, or both RPD and drusen by means of optical coherence tomography angiography (OCT-A). METHODS: Cross-sectional observational case series. Patients with non-neovascular AMD presenting at the Medical Retina Service of the Department of Ophthalmology, University Vita-Salute San Raffaele in Milan were recruited...
January 5, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28057442/iron-importers-zip8-and-zip14-are-expressed-in-retina-and-regulated-by-retinal-iron-levels
#10
Jacob Sterling, Samyuktha Guttha, Ying Song, Delu Song, Majda Hadziahmetovic, Joshua L Dunaief
Intracellular retinal iron accumulation has been implicated in the pathogenesis of age-related macular degeneration (AMD), the leading cause of irreversible blindness among individuals over the age of 50. Ceruloplasmin/hephaestin double knockout mice (Cp/Heph DKO) and hepcidin knockout mice (Hepc KO) accumulate retinal iron and model some features of AMD. Two canonical pathways govern cellular iron import - transferrin-bound iron import and non-transferrin bound iron import. In Cp/Heph DKO and Hepc KO iron-loaded retinas, transferrin-bound iron import is downregulated...
January 2, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28055012/aif-independent-parthanatos-in-the-pathogenesis-of-dry-age-related-macular-degeneration
#11
Ki-Hong Jang, Yun-Ju Do, Dongwon Son, Eunji Son, Jun-Sub Choi, Eunhee Kim
Cell death of retinal pigment epithelium (RPE) is characterized as an essential late-stage phenomenon of dry age-related macular degeneration (AMD). The aim of this study was to elucidate the molecular mechanism underlying RPE cell death after exposure to oxidative stress, which occurs often because of the anatomical location of RPE cells. ARPE-19, an established RPE cell line, exhibited necrotic features involving poly (ADP-ribose) polymerase-1 (PARP-1) activation in response to hydrogen peroxide (H2O2). ARPE-19 cells were resistant to H2O2 when PARP-1 was depleted using siRNA or inhibited by a pharmacological inhibitor of PARP-1, olaparib...
January 5, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28049835/imaging-individual-neurons-in-the-retinal-ganglion-cell-layer-of-the-living-eye
#12
Ethan A Rossi, Charles E Granger, Robin Sharma, Qiang Yang, Kenichi Saito, Christina Schwarz, Sarah Walters, Koji Nozato, Jie Zhang, Tomoaki Kawakami, William Fischer, Lisa R Latchney, Jennifer J Hunter, Mina M Chung, David R Williams
Although imaging of the living retina with adaptive optics scanning light ophthalmoscopy (AOSLO) provides microscopic access to individual cells, such as photoreceptors, retinal pigment epithelial cells, and blood cells in the retinal vasculature, other important cell classes, such as retinal ganglion cells, have proven much more challenging to image. The near transparency of inner retinal cells is advantageous for vision, as light must pass through them to reach the photoreceptors, but it has prevented them from being directly imaged in vivo...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28045789/imaging-and-measurement-of-the-preretinal-space-in-vitreomacular-adhesion-and-vitreomacular-traction-by-a-new-spectral-domain-optical-coherence-tomography-analysis
#13
Marcin Stopa, Elżbieta Marciniak, Piotr Rakowicz, Agnieszka Stankiewicz, Tomasz Marciniak, Adam Dąbrowski
PURPOSE: To evaluate a new method for volumetric imaging of the preretinal space (also known as the subhyaloid, subcortical, or retrocortical space) and investigate differences in preretinal space volume in vitreomacular adhesion (VMA) and vitreomacular traction (VMT). METHODS: Nine patients with VMA and 13 with VMT were prospectively evaluated. Automatic inner limiting membrane line segmentation, which exploits graph search theory implementation, and posterior cortical vitreous line segmentation were performed on 141 horizontal spectral domain optical coherence tomography B-scans per patient...
December 30, 2016: Retina
https://www.readbyqxmd.com/read/28045002/topographic-prominence-discriminator-for-the-detection-of-short-latency-spikes-of-retinal-ganglion-cells
#14
Myoung-Hwan Choi, Jungryul Ahn, Daejin Park, Sang Min Lee, Kwangsoo Kim, Dong-Il Cho, Solomon Senok, Kyo-In Koo, Yongsook Goo
<i>Objective</i>: Direct stimulation of retinal ganglion cells in degenerate retinas by implanting epi-retinal prostheses is a recognized strategy for restoration of visual perception in patients with retinitis pigmentosa or age-related macular degeneration. Elucidating the best stimulus-response paradigms in the laboratory using multielectrode arrays (MEA) is complicated by the fact that the short-latency spikes (within 10 ms) elicited by direct retinal ganglion cell (RGC) stimulation are obscured by the stimulus artifact which is generated by the electrical stimulator...
January 3, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28038685/grafted-c-kit-ssea1-eye-wall-progenitor-cells-delay-retinal-degeneration-in-mice-by-regulating-neural-plasticity-and-forming-new-graft-to-host-synapses
#15
Xi Chen, Zehua Chen, Zhengya Li, Chen Zhao, Yuxiao Zeng, Ting Zou, Caiyun Fu, Xiaoli Liu, Haiwei Xu, Zheng Qin Yin
BACKGROUND: Despite diverse pathogenesis, the common pathological change observed in age-related macular degeneration and in most hereditary retinal degeneration (RD) diseases is photoreceptor loss. Photoreceptor replacement by cell transplantation may be a feasible treatment for RD. The major obstacles to clinical translation of stem cell-based cell therapy in RD remain the difficulty of obtaining sufficient quantities of appropriate and safe donor cells and the poor integration of grafted stem cell-derived photoreceptors into the remaining retinal circuitry...
December 30, 2016: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28033280/stereotactic-radiotherapy-in-neovascular-age-related-macular-degeneration-real-life-efficacy-and-morphological-evaluation-of-the-outer-retina-choroid-complex
#16
Mahdy Ranjbar, Maximilian Kurz, Annekatrin Holzhey, Corinna Melchert, Dirk Rades, Salvatore Grisanti
Stereotactic radiotherapy (SRT) is a new approach to treat neovascular age-related macular degeneration (nAMD). The INTREPID trial suggested that SRT could reduce the frequency of regular intravitreal injections (IVIs) with antivascular endothelial growth factor drugs, which are necessary to control disease activity. However, the efficacy of SRT in nAMD and resulting morphological changes have not been validated under real-life circumstances, an issue, which we would like to address in this retrospective analysis...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28027551/the-risk-of-macular-degeneration-development-in-persons-antenatally-irradiated-as-a-result-of-chornobyl-npp-accident
#17
T F Babenko, P A Fedirko, R Y Dorichevska, N V Denysenko, L A Samoteikina, O P Tyshchenko
OBJECTIVE: Assess the risk of macular degeneration development in persons exposed in utero as a result of Chornobyl NPP accident. MATERIALS AND METHODS: The object of the study was the state of the macular area of the retina of 84 individuals exposed in utero as a result of the Chornobyl disaster. They were surveyed at the age of 14-30. The results of stan dardized ophthalmic examinations conducted between 2000 and 2016 were used. The control group consisted of 165 persons who have not undergone prenatal exposure and were examined at the same age as the core group...
December 2016: Problemy Radiat︠s︡iĭnoï Medyt︠s︡yny Ta Radiobiolohiï
https://www.readbyqxmd.com/read/28026019/activating-the-akt2-nf%C3%AE%C2%BAb-lcn-2-axis-elicits-an-inflammatory-response-in-age-related-macular-degeneration
#18
Sayan Ghosh, Peng Shang, Meysam Yazdankhah, Imran Bhutto, Stacey Hose, Sandra R Montezuma, Tianqi Luo, Sreya Chattopadhyay, Jiang Qian, Gerard A Lutty, Deborah A Ferrington, J Samuel Zigler, Debasish Sinha
Age-related macular degeneration (AMD) is a complex and progressive degenerative eye disease resulting in severe loss of central vision. Recent evidence indicates that immune system dysregulation could contribute to the development of AMD. We hypothesize that defective lysosome-mediated clearance causes accumulation of waste products in the retinal pigmented epithelium (RPE), activating the immune system and leading to retinal tissue injury and AMD. We have generated unique genetically engineered mice in which lysosome-mediated clearance (both by phagocytosis and autophagy) in RPE cells is compromised, causing development of features of early AMD...
December 27, 2016: Journal of Pathology
https://www.readbyqxmd.com/read/28003336/polysialic-acid-blocks-mononuclear-phagocyte-reactivity-inhibits-complement-activation-and-protects-from-vascular-damage-in-the-retina
#19
Marcus Karlstetter, Jens Kopatz, Alexander Aslanidis, Anahita Shahraz, Albert Caramoy, Bettina Linnartz-Gerlach, Yuchen Lin, Anika Lückoff, Sascha Fauser, Katharina Düker, Janine Claude, Yiner Wang, Johannes Ackermann, Tobias Schmidt, Veit Hornung, Christine Skerka, Thomas Langmann, Harald Neumann
Age-related macular degeneration (AMD) is a major cause of blindness in the elderly population. Its pathophysiology is linked to reactive oxygen species (ROS) and activation of the complement system. Sialic acid polymers prevent ROS production of human mononuclear phagocytes via the inhibitory sialic acid-binding immunoglobulin-like lectin-11 (SIGLEC11) receptor. Here, we show that low-dose intravitreal injection of low molecular weight polysialic acid with average degree of polymerization 20 (polySia avDP20) in humanized transgenic mice expressing SIGLEC11 on mononuclear phagocytes reduced their reactivity and vascular leakage induced by laser coagulation...
December 21, 2016: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/27999450/association-between-vascular-endothelial-growth-factor-polymorphisms-and-age-related-macular-degeneration-an-updated-meta-analysis
#20
REVIEW
Martina Barchitta, Andrea Maugeri
Age-related macular degeneration (AMD) is the most common cause of blindness in elderly people worldwide and the major degenerative disease of the retina that leads to progressive impairment of central vision. Several polymorphisms in different genes have been proposed as factors that increase the disease susceptibility. The aim of the present study is to carry out a systematic review and an updated meta-analysis in order to summarize the current published studies and to evaluate the associations between four common vascular endothelial growth factor (VEGF) polymorphisms (rs833061, rs1413711, rs3025039, and rs2010963) and AMD risk, also stratifying for AMD subtypes and ethnicity...
2016: Disease Markers
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