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https://www.readbyqxmd.com/read/28448669/prevalence-of-undiagnosed-age-related-macular-degeneration-in-primary-eye-care
#1
David C Neely, Kevin J Bray, Carrie E Huisingh, Mark E Clark, Gerald McGwin, Cynthia Owsley
Importance: Age-related macular degeneration (AMD) is the leading cause of irreversible vision impairment in older adults in the United States, yet little is known about whether AMD is appropriately diagnosed in primary eye care. Objectives: To examine the prevalence of eyes with AMD in patients seen in primary eye care clinics who purportedly have normal macular health per their medical record and the association of AMD with patient and physician characteristics...
April 27, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28447781/artemisinin-protectes-retinal-neuronal-cells-against-oxidative-stress-and-restores-rat-retinal-physiological-function-from-light-exposed-damage
#2
Fengxia Yan, Hai-Tao Wang, Yang Gao, Jiang-Ping Xu, Wenhua Zheng
Oxidative stress plays a key role in the pathogenesis of age-related macular degeneration (AMD), a leading cause of severe visual loss and blindness in the aging population which lacks any effective treatments currently. In this study, artemisinin, a well-known anti-malarial drug was found to suppress hydrogen peroxide (H2O2)-induced cell death in retinal neuronal RGC-5 cells. Artemisinin, in the therapeutically relevant dosage, concentration-dependently attenuated the accumulation of intracellular reactive oxygen species (ROS), increased mitochondrial mitochondrial membrane potential and decreased cell apoptosis in RGC-5 cells induced by H2O2...
April 27, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28447585/metabolic-profiles-of-individuals-switched-to-second-line-antiretroviral-therapy-after-failing-standard-first-line-therapy-for-treatment-of-hiv-1-infection-in-a-randomized-controlled-trial
#3
Amanda H Yao, Cecilia L Moore, Poh Lian Lim, Jean-Michel Molina, Juan Sierra Madero, Stephen Kerr, Paddy Wg Mallon, Sean Emery, David A Cooper, Mark A Boyd
BACKGROUND: To investigate metabolic changes associated with second-line antiretroviral therapy (ART) following virological failure of first-line ART. METHODS: SECOND-LINE was an open-label randomized controlled trial. Participants were randomized 1:1 to receive ritonavir-boosted lopinavir (LPV/r) with 2-3 nucleoside/nucleotide reverse transcriptase inhibitors (N(t)RTI-group) or raltegravir (RAL-group) Two hundred and ten participants had a dual energy X-ray absorptiometry (DXA)-scan at baseline, week 48 and 96...
April 27, 2017: Antiviral Therapy
https://www.readbyqxmd.com/read/28446683/what-s-old-is-new-again-autologous-stem-cell-transplant-for-amd
#4
Leah C Byrne
Transplanted RPE cells derived from induced pluripotent stem cells maintained vision and were well tolerated in a patient with age-related macular degeneration.
April 26, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28446513/frequent-hypomorphic-alleles-account-for-a-significant-fraction-of-abca4-disease-and-distinguish-it-from-age-related-macular-degeneration
#5
Jana Zernant, Winston Lee, Frederick T Collison, Gerald A Fishman, Yuri V Sergeev, Kaspar Schuerch, Janet R Sparrow, Stephen H Tsang, Rando Allikmets
BACKGROUND: Variation in the ABCA4 gene is causal for, or associated with, a wide range of phenotypes from early onset Mendelian retinal dystrophies to late-onset complex disorders such as age-related macular degeneration (AMD). Despite substantial progress in determining the causal genetic variation, even complete sequencing of the entire open reading frame and splice sites of ABCA4 identifies biallelic mutations in only 60%-70% of cases; 20%-25% remain with one mutation and no mutations are found in 10%-15% of cases with clinically confirmed ABCA4 disease...
April 26, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28445650/cxcr4-targeted-and-redox-responsive-dextrin-nanogel-for-metastatic-breast-cancer-therapy
#6
Feiran Zhang, Siman Gong, Jun Wu, Huipeng Li, David Oupicky, Minjie Sun
The unsatisfied results of cancer therapy are caused by many issues and metastasis of cancer cells is one of the major challenge. It has been reported that inhibiting the SDF1/CXCR4 interaction can significantly reduce the metastasis of breast cancer cells to regional lymph nodes and lung. Herein, a nanogel system equipped with the FDA-approved CXCR4 antagonist AMD3100 was developed and evaluated for its combined anti-metastatic and tumor targeting effects. Briefly, a bioreducible cross-linked dextrin nanogel (DNG) coated with AMD3100 was designed to possess multiple functions, including CXCR4 chemokine targeting, inhibition of tumor metastasis and reduction-responsive intracellular release of doxorubicin (DOX) to reduce the cells proliferation...
April 26, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28442885/complement-c5a-receptor-knockout-has-diminished-light-induced-microglia-macrophage-retinal-migration
#7
Delu Song, Michael E Sulewski, Chenguang Wang, Jiantao Song, Rupak Bhuyan, Jacob Sterling, Esther Clark, Wen-Chao Song, Joshua L Dunaief
PURPOSE: The complement system is involved in the pathogenesis of age-related macular degeneration (AMD). Because activated microglia are also associated with AMD, we studied the relationship between complement anaphylatoxin receptors and microglial recruitment. METHODS: We assessed the effect of anaphylatoxin C3a receptor (C3aR) and C5a receptor (C5aR) knockout (KO) on light damage-induced migration of microglia/macrophages into the mouse outer retina via immunofluorescence and real-time quantitative PCR...
2017: Molecular Vision
https://www.readbyqxmd.com/read/28442497/an-in-silico-model-of-retinal-cholesterol-dynamics-rcd-model-insights-into-the-pathophysiology-of-dry-age-related-macular-degeneration
#8
Seyedeh Maryam Zekavat, James Lu, Cyrille Maugeais, Norman A Mazer
We developed an in-silico mathematical model of retinal cholesterol (Ch) dynamics (RCD) to quantify the physiological rate of Ch turnover in the rod outer segment (ROS), the lipoprotein transport mechanisms by which Ch enters and leaves the outer retina, and the rates of drusen growth and macrophage-mediated clearance in dry Age-Related Macular Degeneration (AMD). Based on existing experimental data and mechanistic hypotheses, we estimate the Ch turnover rate in the ROS to be 1-6 pg/mm2/min, dependent on the rate of Ch recycling in the outer retina, and find comparable rates for LDL receptor-mediated endocytosis of Ch by the retinal pigment epithelium (RPE), ABCA1-mediated Ch transport from the RPE to outer retina, ABCA1-mediated Ch efflux from the RPE to choroid, and the secretion of 70 nm ApoB-Ch particles from the RPE...
April 25, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28442372/long-term-release-and-stability-of-pharmaceutical-proteins-delivered-from-solid-lipid-implants
#9
Moritz Vollrath, Julia Engert, Gerhard Winter
Solid lipid implants (SLIs) prepared by twin-screw (tsc) extrusion represent a promising technology platform for the sustained release of pharmaceutical proteins. In this work, we report on two aspects, long-term release and stability of released protein. First, SLIs were produced by tsc-extrusion containing the low melting triglyceride H12 and the high melting triglyceride Dynasan D118. Two different proteins available in a freeze-dried matrix containing hydroxypropyl-β-cyclodextrine (HP-β-CD) were incorporated into the lipid matrix: a monoclonal antibody (mAb) from the IgG1 class and the fab-fragment Ranibizumab (Lucentis(®))...
April 22, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28440247/circulating-biomarkers-in-glaucoma-age-related-macular-degeneration-and-diabetic-retinopathy
#10
Madhu Nath, Nabanita Halder, Thirumurthy Velpandian
Biomarkers to predict the altering physiological conditions over the period leading toward the ocular disorders are of major importance in therapeutics. Isolation and validation of the biomarkers specific to ocular diseases are a challenging task. Glaucoma is a neurodegenerative disease of the eye where the correlation of biomarkers in circulating fluid may be made specific for the eye. However, conditions such as wet age-related macular degeneration (AMD) and proliferative diabetic retinopathy (DR), circulating biomarkers might be having some degree of overlap with other conditions like cancer where a common factor such as angiogenesis is involved...
March 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28440245/pluripotent-stem-cells-a-therapeutic-source-for-age-related-macular-degeneration
#11
REVIEW
Sowmya Parameswaran, Subramanian Krishnakumar
Age-related macular degeneration (AMD) leads to progressive loss of central vision in the elderly. At a cellular level, there is aging of the retinal pigment epithelial (RPE) cells, and accumulation of lipofuscin that interferes with the proper functioning of RPE which eventually leads to apoptosis. Treatment depends on the stage of the disease. Wet AMD which has neovascularization is managed by local therapies such as laser photocoagulation and photodynamic therapy and is managed with injections of antivascular endothelial growth factor-based therapy...
March 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28438165/microglia-derived-il-1%C3%AE-promotes-chemokine-expression-by-m%C3%A3-ller-cells-and-rpe-in-focal-retinal-degeneration
#12
Riccardo Natoli, Nilisha Fernando, Michele Madigan, Joshua A Chu-Tan, Krisztina Valter, Jan Provis, Matt Rutar
BACKGROUND: Chemokine signalling is required for the homing of leukocytes during retinal inflammation, and is associated with pathogenesis of diseases such as age-related macular degeneration (AMD). Here, we explore the role of interleukin-1β (IL-1β) in modulating AMD-associated chemokines Ccl2, Cxcl1, and Cxcl10 during photo-oxidative retinal damage, and the effect on both the accumulation of outer-retinal macrophages, and death of photoreceptors. METHODS: Inhibition of retinal IL-1β expression was performed using either siRNA or antibody neutralisation, which was intravitreally injected in SD rats prior to photo-oxidative damage...
April 24, 2017: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/28437528/automated-staging-of-age-related-macular-degeneration-using-optical-coherence-tomography
#13
Freerk G Venhuizen, Bram van Ginneken, Freekje van Asten, Mark J J P van Grinsven, Sascha Fauser, Carel B Hoyng, Thomas Theelen, Clara I Sánchez
Purpose: To evaluate a machine learning algorithm that automatically grades age-related macular degeneration (AMD) severity stages from optical coherence tomography (OCT) scans. Methods: A total of 3265 OCT scans from 1016 patients with either no signs of AMD or with signs of early, intermediate, or advanced AMD were randomly selected from a large European multicenter database. A machine learning system was developed to automatically grade unseen OCT scans into different AMD severity stages without requiring retinal layer segmentation...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28437524/the-evolution-of-the-plateau-an-optical-coherence-tomography-signature-seen-in-geographic-atrophy
#14
Anna C S Tan, Polina Astroz, Kunal K Dansingani, Jason S Slakter, Lawrence A Yannuzzi, Christine A Curcio, K Bailey Freund
Purpose: Histologic details of progression routes to geographic atrophy (GA) in AMD are becoming available through optical coherence tomography (OCT). We studied the origins and evolution of an OCT signature called plateau in eyes with GA and suggested a histologic correlate. Methods: Serial eye-tracked OCT scans and multimodal imaging were acquired from eight eyes of seven patients with GA and plateau signatures over a mean follow-up of 7.7 years (range, 3.7-11...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28435212/testing-the-clinical-value-of-multifocal-electroretinography-and-microperimetry-and-the-effects-of-intravitreal-therapy-with-ranibizumab-on-macular-function-in-the-course-of-wet-age-related-macular-degeneration-a-1-year-prospective-study
#15
Mihaela Reinsberg, Ralf-Dieter Hilgers, Inger Lüdeke, Khaled Nassar, Swaantje Grisanti, Salvatore Grisanti, Julia Lüke, Matthias Lüke
PURPOSE: To investigate the clinical value of multifocal electroretinography (mfERG) and microperimetry and the effects of intravitreal therapy with ranibizumab (Lucentis(®)) on macular function in the course of neovascular age-related macular degeneration (nAMD). MATERIALS AND METHODS: We conducted a prospective single-arm interventional cohort study with 20 nAMD patients older than 50 years. Examinations were scheduled monthly for 1 year during intravitreal therapy with ranibizumab...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28435054/experience-with-a-subretinal-cell-based-therapy-in-patients-with-geographic-atrophy-secondary-to-age-related-macular-degeneration
#16
Allen C Ho, Tom S Chang, Michael Samuel, Paul Williamson, Robert F Willenbucher, Terri Malone
PURPOSE: To evaluate the safety and tolerability of and clinical response to a single, subretinal dose of human umbilical tissue-derived cells (palucorcel [CNTO-2476]) in the eyes of adults aged ≥50 years with bilateral geographic atrophy (GA) secondary to age-related macular degeneration (AMD). DESIGN: Phase 1/2a, multicenter, open-label, dose-escalation, fellow-eye-controlled study. METHODS: In the phase 1 portion, eyes were assigned to receive a single, subretinal dose of palucorcel (ranging from 6...
April 20, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28432733/variability-in-hba1c-blood-pressure-lipid-parameters-and-serum-uric-acid-and-risk-of-development-of-chronic-kidney-disease-in-type-2-diabetes
#17
Antonio Ceriello, Salvatore De Cosmo, Maria Chiara Rossi, Giuseppe Lucisano, Stefano Genovese, Roberto Pontremoli, Paola Fioretto, Carlo Giorda, Antonio Pacilli, Francesca Viazzi, Giuseppina Russo, Antonio Nicolucci
AIMS: Variability in HbA1c and blood pressure (BP) is associated with the risk of diabetic kidney disease (DKD). No evidence exists on the role of variability in lipids or serum uric acid (UA), or the interplay between the variability of different parameters, on renal outcomes. MATERIALS AND METHODS: Within the AMD Annals database we identified patients with ≥5 measurements of HbA1c, SBP and DBP, total-, HDL- and LDL- cholesterol, triglycerides, and UA. Patients were followed-up for up to 5 years...
April 21, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28431372/down-flow-fixed-structured-bed-reactor-an-innovative-reactor-configuration-applied-to-acid-mine-drainage-treatment-and-metal-recovery
#18
Leandro Augusto Gouvêa de Godoi, Eugenio Foresti, Márcia Helena Rissato Zamariolli Damianovic
A down-flow fixed-structured bed reactor (DFSBR) was operated for 277 days treating a mixture of synthetic substrates simulating an iron-rich acid mine drainage (AMD) and the soluble fraction of a sugarcane vinasse. The synthetic sugarcane vinasse was used as electron donor for biological sulfate-reduction, resulting in influent chemical oxygen demand (COD) close to 4000 mg L(-1) and volumetric organic loading rate of 4.8 g L(-1)d(-1). The influent sulfate concentration was kept close to 2000 mg L(-1) (volumetric sulfate loading rate of 2...
April 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28427081/choroidal-thickness-and-microperimetry-sensitivity-in-age-related-macular-degeneration
#19
Geoffrey K Broadhead, Thomas Hong, Peter McCluskey, John R Grigg, Timothy E Schlub, Andrew A Chang
PURPOSE: To assess choroidal thickness (CT) and its relationship to retinal sensitivity in mild/moderate age-related macular degeneration (AMD). METHODS: Seventy-two eyes of 51 participants with mild/moderate AMD and 36 eyes of 18 age-matched normal participants were prospectively recruited to undergo enhanced-depth imaging optical coherence tomography (EDI-OCT) imaging and microperimetry (MP) functional assessment. OCT-measured CT and retinal thickness (RT) were matched with MP sensitivity at 13 retinal loci, and correlations were analysed...
April 21, 2017: Ophthalmic Research
https://www.readbyqxmd.com/read/28425969/the-pharmacological-effects-of-lutein-and-zeaxanthin-on-visual-disorders-and-cognition-diseases
#20
REVIEW
Yu-Ping Jia, Lei Sun, He-Shui Yu, Li-Peng Liang, Wei Li, Hui Ding, Xin-Bo Song, Li-Juan Zhang
Lutein (L) and zeaxanthin (Z) are dietary carotenoids derived from dark green leafy vegetables, orange and yellow fruits that form the macular pigment of the human eyes. It was hypothesized that they protect against visual disorders and cognition diseases, such as age-related macular degeneration (AMD), age-related cataract (ARC), cognition diseases, ischemic/hypoxia induced retinopathy, light damage of the retina, retinitis pigmentosa, retinal detachment, uveitis and diabetic retinopathy. The mechanism by which they are involved in the prevention of eye diseases may be due their physical blue light filtration properties and local antioxidant activity...
April 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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