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https://www.readbyqxmd.com/read/29244747/ophthalmic-formulation-containing-nilvadipine-nanoparticles-prevents-retinal-dysfunction-in-rats-injected-with-streptozotocin
#1
Saori Deguchi, Hiroko Otake, Yosuke Nakazawa, Noriko Hiramatsu, Naoki Yamamoto, Noriaki Nagai
Retinopathy leads to irreparable vision loss via capillary closure and areas of nonperfusion. However, the current instillation systems do not allow a sufficient amount of drug required to treat retinopathy to reach the posterior segment (retina); therefore, a new formulation targeting the posterior segment is expected as therapy for retinopathy. We prepared ophthalmic formulations containing nilvadipine nanoparticles (NILnano), and demonstrated whether the instillation of NILnano can prevent retinal dysfunction in rats injected with excessive streptozotocin (STZ rats) in this study...
December 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29244539/genotype-phenotype-variability-of-retinal-manifestation-in-primary-hyperoxaluria-type-1
#2
S Dulz, E Bigdon, Y Atiskova, F Schuettauf, R Cerkauskiene, J Oh, F Brinkert
BACKGROUND: Primary hyperoxaluria type 1 (PH1) is a rare congenital metabolic disorder of the glyoxylate pathway, which manifests with nephrocalcinosis, urolithiasis, and end-stage renal failure (ESRD) as well as deposition of oxalate crystals within ocular tissues. This report demonstrates classical ocular features of PH1 of the posterior pole and furthermore highlights the ocular genotype-phenotype variability among siblings with identical compound heterozygous alanine-glyoxylate aminotransferase (AGXT) mutations...
December 15, 2017: Ophthalmic Genetics
https://www.readbyqxmd.com/read/29243450/pathogenesis-of-age-related-macular-degeneration-dialogue-between-autophagy-and-inflammasomes
#3
Niko Kivinen, Ali Koskela, Anu Kauppinen, Kai Kaarniranta
Age-related macular degeneration is a condition affecting central vision, and is the leading cause of blindness and visual impairment in the western countries. For a long time, inflammation has been associated with the pathogenesis of the condition, and according to current knowledge, inflammation in the retinal pigment epithelial cells (RPE) results from an impairment of intracellular cleansing systems. In combination with the degeneration of RPE cells, this eventually leads to the destruction of light-sensing cells...
2017: Duodecim; Lääketieteellinen Aikakauskirja
https://www.readbyqxmd.com/read/29243035/systemic-lupus-erythematosus-and-ocular-involvement-an-overview
#4
REVIEW
Rosanna Dammacco
Systemic lupus erythematosus (SLE) is a multisystem autoimmune disease of undefined etiology and with remarkably heterogeneous clinical features. Virtually any organ system can be affected, including the eye. SLE-related eye involvement can be diagnosed in approximately one-third of the patients and is usually indicative of disease activity. An early diagnosis and the adoption of suitable therapeutic measures are necessary to prevent sight-threatening consequences, especially in patients with juvenile SLE. Periocular lesions, such as eyelid involvement and orbital inflammation, are relatively rare and, in case of orbital masses, may require a biopsy control...
December 14, 2017: Clinical and Experimental Medicine
https://www.readbyqxmd.com/read/29242930/optical-coherence-tomography-transecting-an-omega-retinal-venous-loop-en-face-in-a-patient-with-diabetic-retinopathy
#5
Christina Y Weng, Joseph F Morales
No abstract text is available yet for this article.
December 14, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/29242908/changes-in-relative-position-of-choroidal-versus-retinal-vessels-in-preterm-infants
#6
Sang Jin Kim, J Peter Campbell, Susan Ostmo, Karyn E Jonas, R V Paul Chan, Michael F Chiang
Purpose: The purpose of this study was to characterize a novel finding that relative positions of choroidal and retinal vessels change over time in preterm infants and to identify factors associated with this finding using quantitative analysis. Methods: Fundus images were obtained prospectively through a retinopathy of prematurity (ROP) cohort study. Images were excluded if choroidal vessels could not be identified. Changes in relative position of characteristic choroidal landmarks with respect to retinal vessels between two time points 5 to 7 weeks apart were measured...
December 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29242904/platelet-derived-growth-factor-bb-lessens-light-induced-rod-photoreceptor-damage-in-mice
#7
Kei Takahashi, Masamitsu Shimazawa, Hiroshi Izawa, Yuki Inoue, Yoshiki Kuse, Hideaki Hara
Purpose: Platelet-derived growth factor (PDGF)-BB is known to have neuroprotective effects against various neurodegenerative disorders. The purpose of this study was to determine whether PDGF-BB can be neuroprotective against light-induced photoreceptor damage in mice. Methods: Mice were exposed to 8000-lux luminance for 3 hours to induce phototoxicity. Two hours before light exposure, the experimental mice were injected with PDGF-BB intravitreally, and the control mice were injected with phosphate-buffered saline...
December 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29242902/effects-of-prenatal-alcohol-exposure-on-the-visual-system-of-monkeys-measured-at-different-stages-of-development
#8
Vanessa Harrar, Laurent Elkrief, Joseph Bouskila, Ryan Kucera, Anders Fink-Jensen, Jean-François Bouchard, Roberta Palmour, Maurice Ptito
Purpose: Fetal alcohol spectrum disorder (FASD) is a developmental disease characterized by behavioral problems and physical defects including malformations of the eye and associated optical defects. How these malformations affect retinal functioning is not well known, although animal models have suggested that scotopic vision is particularly deficient. Age is also known to affect scotopic vision. Here, we determined the combined effects of age and fetal alcohol exposure (FAE) on retinal function using full-field electroretinograms (ERGs) in monkeys (Chlorocebus sabaeus)...
December 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29242900/evaluation-of-retinal-nerve-fiber-layer-thinning-in-myopic-glaucoma-impact-of-optic-disc-morphology
#9
Kyeong Ik Na, Won June Lee, Young Kook Kim, Ki Ho Park, Jin Wook Jeoung
Purpose: The purpose of this study was to investigate the role of optic disc torsion on the rate of progressive retinal nerve fiber layer (RNFL) thinning in patients with myopic open-angle glaucoma. Methods: We included 102 patients with myopic open-angle glaucoma accompanied by glaucomatous damage confined to a single hemiretina who were followed up over a 5-year period. We divided the subjects into three groups according to the presence or absence of optic disc torsion and the correspondence between the direction of optic disc torsion and the location of glaucomatous damage: torsion with reverse correspondence group (eyes showing inferior optic disc torsion with glaucomatous damage in the superior quadrant or eyes showing superior torsion with damage in the inferior quadrant), no torsion group, and torsion with correspondence group (eyes showing inferior optic disc torsion with glaucomatous damage in the inferior quadrant or eyes showing superior torsion with damage in the superior quadrant)...
December 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29242645/retinal-angiogenesis-regulates-astrocytic-differentiation-in-neonatal-mouse-retinas-by-oxygen-dependent-mechanisms
#10
Li-Juan Duan, Sarah J Pan, Thomas N Sato, Guo-Hua Fong
In mice, retinal vascular and astrocyte networks begin to develop at birth, expanding radially from the optic nerve head (ONH) towards the retinal periphery. The retinal vasculature grows towards the periphery ahead of differentiated astrocytes, but behind astrocytic progenitor cells (APCs) and immature astrocytes. Endothelial cell specific Vegfr-2 disruption in newborn mice not only blocked retinal vascular development but also suppressed astrocytic differentiation, reducing the abundance of differentiated astrocytes while causing the accumulation of precursors...
December 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29242588/in-retinitis-pigmentosa-trkc-t1-dependent-vectorial-erk-activity-upregulates-glial-tnf-%C3%AE-causing-selective-neuronal-death
#11
Alba Galán, Sean Jmaeff, Pablo F Barcelona, Fouad Brahimi, Marinko V Sarunic, H Uri Saragovi
In some diseases the TrkC.T1 isoform is upregulated in glia, associated with glial TNF-α production and neuronal death. What remains unknown are the activating signals in glia, and how paracrine signals may be selective for a targeted neuron while sparing other proximate neurons. We studied these questions in the retina, where Müller glia contacts photoreceptors on one side and retinal ganglion cells on the other. In a mutant Rhodopsin mouse model of retinitis pigmentosa (RP) causing progressive photoreceptor death-but sparing retinal ganglion cells-TrkC...
December 14, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29242502/impact-of-electrode-position-on-the-elicitation-of-sodium-spikes-in-retinal-bipolar-cells
#12
Frank Rattay, Hassan Bassereh, Andreas Fellner
Bipolar cells of the magnocellular pathway in the primate retina can generate action potentials because they have an axonal segment with high sodium channel density, comparable to the sodium channel band in retinal ganglion cells or pyramidal cells. The similarity between the non-human primate and the human retina is of interest for the research on retinal implants for the blind, and especially, the conditions to elicit sodium spikes in bipolar cells using extracellular stimulation. A comparison of excitation characteristics of three model neurons, a bipolar cell, a retinal ganglion cell, and a cortical pyramidal cell, demonstrates the similarities and differences regarding stimulation with microelectrodes...
December 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29242270/intermedin-enlarges-the-vascular-lumen-by-inducing-the-quiescent-endothelial-cell-proliferation
#13
Li-Jun Wang, Fei Xiao, Ling-Miao Kong, De-Nian Wang, Hong-Yu Li, Yong-Gang Wei, Chun Tan, Huan Zhao, Ting Zhang, Gui-Qun Cao, Kang Zhang, Yu-Quan Wei, Han-Shuo Yang, Wei Zhang
OBJECTIVE: Intermedin plays an important role in vascular remodeling and significantly improves blood perfusion, but the precise mechanism remains unclear. Herein, we aimed to define whether vascular lumen enlargement is responsible for the intermedin-increased blood perfusion and explore the underlying cellular and molecular mechanisms. APPROACH AND RESULTS: To study the role of intermedin, we generated the IMD-KO (Adm2-/-) mice using CRISPR/Cas9 (clustered regularly interspaced short palindromic repeats/clustered regularly interspaced short palindromic repeat-associated 9) system...
December 14, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29242027/m%C3%A3-ller-glial-cells-of-the-primate-foveola-an-electron-microscopical-study
#14
Steffen Syrbe, Heidrun Kuhrt, Ulrich Gärtner, Gunnar Habermann, Peter Wiedemann, Andreas Bringmann, Andreas Reichenbach
Previous studies on the ultrastructure of the primate foveola suggested the presence of an inverted cone-like structure which is formed by 25-35 specialized Müller cells overlying the area of high photoreceptor density. We investigated the ultrastructure of the Müller cells in the foveola of a human and macaque retina. Sections through the posterior poles of an eye of a 40 years-old human donor and an eye of an adult cynomolgus monkey (Macaca fascicularis) were investigated with transmission electron microscopy...
December 11, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/29241762/eltrombopag-for-advanced-myelodysplastic-syndromes-or-acute-myeloid-leukaemia-and-severe-thrombocytopenia-aspire-a-randomised-placebo-controlled-phase-2-trial
#15
Moshe Mittelman, Uwe Platzbecker, Boris Afanasyev, Sebastian Grosicki, Raymond S M Wong, Achilles Anagnostopoulos, Benjamin Brenner, Claudio Denzlinger, Giuseppe Rossi, Arnon Nagler, Regina Garcia-Delgado, Maria Socorro O Portella, Zewen Zhu, Dominik Selleslag
BACKGROUND: Thrombocytopenia is a life-threatening complication in patients with advanced myelodysplastic syndromes (MDS) and acute myeloid leukaemia (AML). In this study (ASPIRE), we aimed to assess eltrombopag, an oral thrombopoietin receptor agonist, for thrombocytopenia (grade 4) treatment in adult patients with advanced MDS or AML. METHODS: ASPIRE consisted of an open-label, double-blind phase for 8 weeks and a randomised, double-blind phase (parts 1 and 2, reported here) for 12 weeks, and an open-label extension (part 3)...
December 11, 2017: Lancet Haematology
https://www.readbyqxmd.com/read/29241743/glaucoma-after-lens-sparing-vitrectomy-for-advanced-retinopathy-of-prematurity
#16
Eric Nudleman, Ilkay Kilic Muftuoglu, Raouf Gaber, Joshua Robinson, Kimberly Drenser, Antonio Capone, Michael T Trese
PURPOSE: To report the incidence of, and factors related to, glaucoma after lens-sparing vitrectomy (LSV) surgery in advanced retinopathy of prematurity (ROP). DESIGN: Retrospective case series at a single tertiary referral pediatric vitreoretinal practice. PARTICIPANTS: Four hundred and one eyes from 270 patients were included. METHODS: The medical records of patients who underwent LSV for stage 4A, 4B, and 5 ROP were retrospectively reviewed...
December 11, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29241535/strict-independence-of-parallel-and-poly-synaptic-axon-target-matching-during-visual-reflex-circuit-assembly
#17
Tania A Seabrook, Onkar S Dhande, Nao Ishiko, Victoria P Wooley, Phong L Nguyen, Andrew D Huberman
The use of sensory information to drive specific behaviors relies on circuits spanning long distances that wire up through a range of axon-target recognition events. Mechanisms assembling poly-synaptic circuits and the extent to which parallel pathways can "cross-wire" to compensate for loss of one another remain unclear and are crucial to our understanding of brain development and models of regeneration. In the visual system, specific retinal ganglion cells (RGCs) project to designated midbrain targets connected to downstream circuits driving visuomotor reflexes...
December 12, 2017: Cell Reports
https://www.readbyqxmd.com/read/29241233/hyperbaric-oxygen-in-the-treatment-of-acute-retinal-artery-occlusion
#18
Mark J Elder, John A Rawstron, Michael Davis
INTRODUCTION: Acute retinal artery occlusion (ARAO) is a major cause of sudden, painless visual loss, often leaving no useful vision in the affected eye. Its incidence is cited at 0.85 per 100,000 persons per year but may be higher because of under-reporting. The natural history is difficult to study, but a spontaneous resolution rate of < 1-8% for acute, non-arteritic ARAO has been cited. Occurrence in an only eye is devastating for the patient. There is currently no consensus regarding management of ARAO and little evidence to support any treatment modality...
December 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/29240802/systemic-factors-related-to-soluble-pro-renin-receptor-in-plasma-of-patients-with-proliferative-diabetic-retinopathy
#19
Keitaro Hase, Atsuhiro Kanda, Ikuyo Hirose, Kousuke Noda, Susumu Ishida
(Pro)renin receptor [(P)RR], a new component of the tissue renin-angiotensin system (RAS), plays a crucial role in inflammation and angiogenesis in the eye, thus contributing to the development of proliferative diabetic retinopathy (PDR). In this study, we investigated systemic factors related to plasma levels of soluble form of (P)RR [s(P)RR] in patients with PDR. Twenty type II diabetic patients with PDR and 20 age-matched, non-diabetic patients with idiopathic macular diseases were enrolled, and plasma levels of various molecules were measured by enzyme-linked immunosorbent assays...
2017: PloS One
https://www.readbyqxmd.com/read/29240574/evaluation-of-retinal-changes-in-progressive-supranuclear-palsy-and-parkinson-disease
#20
Duygu Gulmez Sevim, Metin Unlu, Murat Gultekin, Cagatay Karaca, Meral Mirza, Galip Ertugrul Mirza
BACKGROUND: Differentiating Parkinson disease (PD) from progressive supranuclear palsy (PSP) can be challenging early in the clinical course. The aim of our study was to see if specific retinal changes could serve as a distinguishing feature. METHODS: We used spectral domain optical coherence tomography (SD-OCT) with automatic segmentation to measure peripapillary nerve fiber layer thickness and the thickness and volume of retinal layers at the macula. RESULTS: Thicknesses of superior peripapillary retinal nerve fiber layer (pRNFL), macular ganglion cell layer, inner plexiform layer, inner nuclear layer, and macular volume were more affected in PSP compared with PD (P < 0...
December 12, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
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