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https://www.readbyqxmd.com/read/28933517/new-treatment-modalities-for-neovascular-age-related-macular-degeneration
#1
Patricio G Schlottmann, Arturo A Alezzandrini, Marcelo Zas, Francisco J Rodriguez, José D Luna, Lihteh Wu
Age-related macular degeneration (AMD) is considered one of the main causes of severe vision loss in older adults. The neovascular form (nAMD) is an advanced stage, which is responsible for the most severe vision loss. Vascular endothelial growth factor (VEGF) is at present the main factor that leads to the development of a neovascular membrane and the increased leakage from the membrane to the retina. At present, anti-VEGF therapy is the only treatment that achieves vision gains in many patients and halts progression in most of them...
September 14, 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28931831/hyperhomocysteinemia-alters-retinal-endothelial-cells-barrier-function-and-angiogenic-potential-via-activation-of-oxidative-stress
#2
Riyaz Mohamed, Isha Sharma, Ahmed S Ibrahim, Heba Saleh, Nehal M Elsherbiny, Sadanand Fulzele, Khaled Elmasry, Sylvia B Smith, Mohamed Al-Shabrawey, Amany Tawfik
Hyperhomocysteinemia (HHcy) is associated with several human visual disorders, such as diabetic retinopathy (DR) and age-related macular degeneration (AMD). Breakdown of the blood-retinal barrier (BRB) is linked to vision loss in DR and AMD. Our previous work revealed that HHcy altered BRB in retinal endothelial cells in vivo. Here we hypothesize that homocysteine (Hcy) alters retinal endothelial cell barrier function and angiogenic potential via activation of oxidative stress. Human retinal endothelial cells (HRECs) treated with and without different concentrations of Hcy showed a reduction of tight junction protein expression, increased FITC dextran leakage, decreased transcellular electrical resistance and increased angiogenic potential...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28920007/towards-treatment-of-stargardt-disease-workshop-organized-and-sponsored-by-the-foundation-fighting-blindness
#3
REVIEW
Avery E Sears, Paul S Bernstein, Artur V Cideciyan, Carel Hoyng, Peter Charbel Issa, Krzysztof Palczewski, Philip J Rosenfeld, SriniVas Sadda, Ulrich Schraermeyer, Janet R Sparrow, Ilyas Washington, Hendrik P N Scholl
Accumulation of fluorescent metabolic byproducts of the visual (retinoid) cycle is associated with photoreceptor and retinal pigment epithelial cell death in both Stargardt disease and atrophic (nonneovascular) age-related macular degeneration (AMD). As a consequence of this observation, small molecular inhibitors of enzymes in the visual cycle were recently tested in clinical trials as a strategy to protect the retina and retinal pigment epithelium in patients with atrophic AMD. To address the clinical translational needs for therapies aimed at both diseases, a workshop organized by the Foundation Fighting Blindness was hosted by the Department of Pharmacology at Case Western Reserve University on February 17, 2017, at the Tinkham Veale University Center, Cleveland, OH, USA...
September 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28918058/reducible-peg-pod-dna-nanoparticles-for-gene-transfer-in%C3%A2-vitro-and-in%C3%A2-vivo-application-in-a-mouse-model-of-age-related-macular-degeneration
#4
Bhanu Chandar Dasari, Siobhan M Cashman, Rajendra Kumar-Singh
Non-viral gene delivery systems are being developed to address limitations of viral gene delivery. Many of these non-viral systems are modeled on the properties of viruses including cell surface binding, endocytosis, endosomal escape, and nuclear targeting. Most non-viral gene transfer systems exhibit little correlation between in vitro and in vivo efficiency, hampering a systematic approach to their development. Previously, we have described a 3.5 kDa peptide (peptide for ocular delivery [POD]) that targets cell surface sialic acid...
September 15, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28918027/adeno-associated-viral-vector-mediated-mtor-inhibition-by-short-hairpin-rna-suppresses-laser-induced-choroidal-neovascularization
#5
Tae Kwann Park, Si Hyung Lee, Jun Sub Choi, Seung Kwan Nah, Hee Jong Kim, Ha Yan Park, Heuiran Lee, Steven Hyun Seung Lee, Keerang Park
Choroidal neovascularization (CNV) is the defining characteristic feature of the wet subtype of age-related macular degeneration (AMD) and may result in irreversible blindness. Based on anti-vascular endothelial growth factor (anti-VEGF), the current therapeutic approaches to CNV are fraught with difficulties, and mammalian target of rapamycin (mTOR) has recently been proposed as a possible therapeutic target, although few studies have been conducted. Here, we show that a recombinant adeno-associated virus-delivered mTOR-inhibiting short hairpin RNA (rAAV-mTOR shRNA), which blocks the activity of both mTOR complex 1 and 2, represents a promising therapeutic approach for the treatment of CNV...
September 15, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28916483/recombinant-humanized-anti-vascular-endothelial-growth-factor-monoclonal-antibody-efficiently-suppresses-laser-induced-choroidal-neovascularization-in-rhesus-monkeys
#6
Wan-Wan Ji, Dong-An Yu, Peng Yang, Peng Fang, Yu-Xia Cao, Hu Li, Ning Xie, Shou-Sheng Yan
Neovascular age-related macular degeneration, characterized by abnormal choroidal neovascularization (CNV), is a major cause of blindness worldwide. Anti-vascular endothelial growth factor (VEGF) antibodies have demonstrated significant efficacy in improving visual acuity. TMAB001 is a new recombinant humanized rabbit anti-VEGF monoclonal antibody. It presents high activities in vitro studies. In the binding affinity assay, TMAB001 exhibited a high binding capability to VEGF with an affinity constant of 10(-11)M...
September 12, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28913545/periostin-in-vitreoretinal-diseases
#7
REVIEW
Shigeo Yoshida, Takahito Nakama, Keijiro Ishikawa, Shintaro Nakao, Koh-Hei Sonoda, Tatsuro Ishibashi
Proliferative vitreoretinal diseases such as diabetic retinopathy, proliferative vitreoretinopathy (PVR), and age-related macular degeneration are a leading cause of decreased vision and blindness in developed countries. In these diseases, retinal fibro(vascular) membrane (FVM) formation above and beneath the retina plays an important role. Gene expression profiling of human FVMs revealed significant upregulation of periostin. Subsequent analyses demonstrated increased periostin expression in the vitreous of patients with both proliferative diabetic retinopathy and PVR...
September 14, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28902330/centrifugal-extension-of-retinal-atrophy-in-retinal-pigment-epithelium-tears-secondary-to-age-related-macular-degeneration
#8
Vittorio Capuano, Roberta Farci, Alexandra Miere, Francesca Amoroso, Francesco Bandello, Eric H Souied, Giuseppe Querques
BACKGROUND AND OBJECTIVE: To investigate the progression of retinal atrophy in patients with retinal pigment epithelium (RPE) tears secondary to neovascular age-related macular degeneration. PATIENTS AND METHODS: In this retrospective case series, patients were analyzed at two high-volume referral centers. The extension of the areas without RPE was analyzed yearly from baseline to last examination through fundus autofluorescence (FAF) imaging using Region Finder (Heidelberg Engineering, Heidelberg, Germany)...
September 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28902095/detection-of-treatment-naive-choroidal-neovascularization-in-age-related-macular-degeneration-by-swept-source-optical-coherence-tomography-angiography
#9
Daniel Ahmed, Martin Stattin, Alexandra Graf, Julia Forster, Carl Glittenberg, Ilse Krebs, Siamak Ansari-Shahrezaei
PURPOSE: To compare the detection rate of choroidal neovascularization (CNV) in treatment-naive neovascular age-related macular degeneration by swept source optical coherence tomography angiography (SS-OCTA, Topcon's DRI Triton) working at 1,050 nm wavelength versus fluorescence angiography. METHODS: Cross-sectional analysis of 156 eyes (107 neovascular age-related macular degeneration and 49 dry AMD) in 98 patients, previously diagnosed by multimodal imaging using fluorescein (FA) and indocyanine green angiography (Heidelberg's Spectralis) in a tertiary retina center, evaluated by SS-OCTA 4...
September 4, 2017: Retina
https://www.readbyqxmd.com/read/28895630/-changes-in-oct-angiography-of-type-2-cnv-in-neovascular-amd-during-anti-vegf-treatment
#10
Henrik Faatz, Kai Rothaus, Frederic Gunnemann, Matthias Gutfleisch, Britta Heimes-Bussmann, Albrecht Lommatzsch, Daniel Pauleikoff, Marie-Louise Farecki
Purpose OCT-A is a new method to visualise the 2D and 3D structures of neovascular complexes in exudative AMD. The aim of the present study was to characterise type 2 CNV in different 2D segmentations and in 3D imaging and to investigate changes during anti-VEGF treatment. Methods 12 patients with type 2 CNV in FA and SD-OCT were selected. OCT-A (Avanti, Optovue) was obtained initially and after the first three injections and thereafter, if "new activity" (increase in sub- or intraretinal fluid) occurred...
September 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28885606/an-overview-of-the-clinical-applications-of-optical-coherence-tomography-angiography
#11
REVIEW
A C S Tan, G S Tan, A K Denniston, P A Keane, M Ang, D Milea, U Chakravarthy, C M G Cheung
Optical coherence tomography angiography (OCTA) has emerged as a novel, non-invasive imaging modality that allows the detailed study of flow within the vascular structures of the eye. Compared to conventional dye angiography, OCTA can produce more detailed, higher resolution images of the vasculature without the added risk of dye injection. In our review, we discuss the advantages and disadvantages of this new technology in comparison to conventional dye angiography. We provide an overview of the current OCTA technology available, compare the various commercial OCTA machines technical specifications and discuss some future software improvements...
September 8, 2017: Eye
https://www.readbyqxmd.com/read/28878627/optic-nerve-degeneration-after-retinal-ischemia-reperfusion-in-a-rodent-model
#12
Marina Renner, Gesa Stute, Mohammad Alzureiqi, Jacqueline Reinhard, Susanne Wiemann, Heiko Schmid, Andreas Faissner, H Burkhard Dick, Stephanie C Joachim
Retinal ischemia is a common pathomechanism in many ocular disorders such as age-related macular degeneration (AMD), diabetic retinopathy, glaucoma or retinal vascular occlusion. Several studies demonstrated that ischemia/reperfusion (I/R) leads to morphological and functional changes of different retinal cell types. However, little is known about the ischemic effects on the optic nerve. The goal of this study was to evaluate these effects. Ischemia was induced by raising the intraocular pressure (IOP) in one eye of rats to 140 mmHg for 1 h followed by natural reperfusion...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28862184/ocular-distribution-of-antioxidant-enzyme-paraoxonase-its-alteration-in-cataractous-lens-diabetic-retina
#13
Subramaniam Rajesh Bharathidevi, Kannadasan Anand Babu, Nishit Jain, Sivashanmugam Muthukumaran, Vetrivel Umashankar, J Biswas, Narayanasamy Angayarkanni
BACKGROUND & OBJECTIVES: The enzyme paraoxonase (PON), an antioxidant enzyme that has both arylesterase and thiolactonase activity, is well studied in cardiovascular diseases. Although a few studies have shown altered PON activity in ocular diseases such as age-related macular degeneration and diabetic retinopathy, but the tissue-wise expression of PON in its three gene forms has not been studied. This study was conducted to see the ocular distribution of PON for any altered expression in ocular pathologies such as in cataract and diabetes mellitus...
April 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/28854577/rna-expression-in-human-retina
#14
Mingyao Li, Randy J Zauhar, Clare Grazal, Christine A Curcio, Margaret M DeAngelis, Dwight Stambolian
Recent Genome-wide Association Studies (GWASs) for eye diseases/traits have delivered a number of novel findings across a diverse range of diseases, including age-related macular degeneration (AMD), glaucoma and refractive error. However, despite this astonishing rate of success, the major challenge still remains to not only confirm that the genes implicated in these studies are truly the genes conferring protection from or risk of disease but also to define the functional roles these genes play in disease...
August 1, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28846772/conditional-m%C3%A3-ller-cell-ablation-leads-to-retinal-iron-accumulation
#15
Bailey Baumann, Jacob Sterling, Ying Song, Delu Song, Marcus Fruttiger, Mark Gillies, Weiyong Shen, Joshua L Dunaief
Purpose: Retinal iron accumulation is observed in a wide range of retinal degenerative diseases, including AMD. Previous work suggests that Müller glial cells may be important mediators of retinal iron transport, distribution, and regulation. A transgenic model of Müller cell loss recently demonstrated that primary Müller cell ablation leads to blood-retinal barrier leakage and photoreceptor degeneration, and it recapitulates clinical features observed in macular telangiectasia type 2 (MacTel2), a rare human disease that features Müller cell loss...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28846119/detection-of-early-loss-of-color-vision-in-age-related-macular-degeneration-with-emphasis-on-drusen-and-reticular-pseudodrusen
#16
Roopa Vemala, Sobha Sivaprasad, John L Barbur
Purpose: To evaluate chromatic sensitivity in patients with age-related macular degeneration (AMD) characterized by drusen and reticular pseudodrusen. To investigate whether the severity of color vision loss can distinguish between various stages of AMD and hence be used as an index of progression toward advanced AMD. Methods: Chromatic sensitivity was measured by using the Color Assessment and Diagnosis (CAD) test in asymptomatic individuals with early and intermediate AMD and compared to normative data...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28845390/melatonin-modulates-prohibitin-and-cytoskeleton-in-the-retinal-pigment-epithelium
#17
Srinivas R Sripathi, Cameron L Prigge, Beth Elledge, Weilue He, Johnpaul Offor, Diana R Gutsaeva, Wan Jin Jahng
The retinal pigment epithelium (RPE) plays imperative roles in normal retinal function by photoreceptor protection from light and phagocytosis of rod and cone outer segments during disc shedding. Melatonin is the free radical scavenger and circadian determinant to protect the RPE and retina from oxidative stress and regulate the circadian clock. The current study tested the hypothesis whether melatonin could affect cytoskeletal structure within RPE. Our Western blot analysis demonstrated that melatonin treatment up-regulated prohibitin 3-fold compared to control...
July 2017: International Journal of Scientific and Engineering Research
https://www.readbyqxmd.com/read/28840163/restoring-vision-in-mice-with-retinal-degeneration-using-multicharacteristic-opsin
#18
Weldon Wright, Sivakumar Gajjeraman, Subrata Batabyal, Sanjay Pradhan, Sulagna Bhattacharya, Vasu Mahapatra, Ashutosh Tripathy, Samarendra Mohanty
Retinal degenerative diseases, such as retinitis pigmentosa (RP) and dry age-related macular degeneration, have led to loss of vision in millions of individuals. Currently, no surgical or medical treatment is available, although optogenetic therapies are in clinical development. We demonstrate vision restoration using multicharacteristics opsin (MCO1) in animal models with degenerated retina. MCO1 is reliably delivered to specific retinal cells via intravitreal injection of adeno-associated virus (vMCO1), leading to significant improvement in visually guided behavior conducted using a radial arm water maze...
October 2017: Neurophotonics
https://www.readbyqxmd.com/read/28829422/development-of-a-refined-protocol-for-trans-scleral-subretinal-transplantation-of-human-retinal-pigment-epithelial-cells-into-rat-eyes
#19
Cuiping Zhao, Nathan C Boles, Justine D Miller, Suzanne Kawola, Sally Temple, Richard J Davis, Jeffrey H Stern
Degenerative retinal diseases such as age-related macular degeneration (AMD) are the leading cause of irreversible vision loss worldwide. AMD is characterized by the degeneration of retinal pigment epithelial (RPE) cells, which are a monolayer of cells functionally supporting and anatomically wrapping around the neural retina. Current pharmacological treatments for the non-neovascular AMD (dry AMD) only slow down the disease progression but cannot restore vision, necessitating studies aimed at identifying novel therapeutic strategies...
August 12, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28829220/neovascular-age-related-macular-degeneration-disease-quiescence-with-visual-acuity-stability-in-a-subgroup-of-patients-following-prn-treatment
#20
Greg D Fliney, Leonid M Zukin, Curtis Hagedorn
PURPOSE: This study evaluates long-term visual acuity (VA) outcomes in patients with prolonged clinically quiescent neovascular age-related macular degeneration (AMD) after treatment with a pro re nata (PRN) regimen of anti-vascular endothelial growth factor agents (bevacizumab, ranibizumab, and/or aflibercept). METHODS: This retrospective study analyzes VA changes in 105 eyes from 72 patients with a period of AMD disease quiescence (determined by retinal examination) not requiring treatment for at least 180 days...
August 22, 2017: Journal of Ocular Pharmacology and Therapeutics
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