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https://www.readbyqxmd.com/read/28135360/retinal-architecture-and-melanopsin-mediated-pupillary-response-characteristics-a-putative-pathophysiologic-signature-for-the-retino-hypothalamic-tract-in-multiple-sclerosis
#1
Ethan Meltzer, Peter V Sguigna, Adnan Subei, Shin Beh, Eric Kildebeck, Darrel Conger, Amy Conger, Marlen Lucero, Benjamin S Frohman, Ashley N Frohman, Shiv Saidha, Steven Galetta, Peter A Calabresi, Robert Rennaker, Teresa C Frohman, Randy H Kardon, Laura J Balcer, Elliot M Frohman
Importance: A neurophysiologic signature of the melanopsin-mediated persistent constriction phase of the pupillary light reflex may represent a surrogate biomarker for the integrity of the retinohypothalamic tract, with potential utility for investigating alterations in homeostatic mechanisms associated with brain disorders and implications for identifying new treatments. Objective: To characterize abnormalities of retinal architecture in patients with multiple sclerosis (MS) and corresponding alterations in the melanopsin-mediated sustained pupillary constriction response...
January 30, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28117076/oct-angiography-of-acute-non-arteritic-anterior-ischemic-optic-neuropathy
#2
M-B Rougier, M-N Delyfer, J-F Korobelnik
PURPOSE: To describe changes of the retinal peripapillary microvasculature on optical coherence tomography angiography (OCT-A) in non-arteritic anterior ischemic optic (NAION) neuropathy. METHODS: Observational study of 10 patients at the acute phase of NAION. OCT-A was performed using a 3mm×3mm square centered on the optic disc (Cirrus HD-OCT with Angioplex, Carl Zeiss Meditec, Dublin, CA). A qualitative comparison was made with the healthy fellow eye of each patient...
February 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28115520/cellular-uptake-and-delivery-of-myeloperoxidase-to-lysosomes-promotes-lipofuscin-degradation-and-lysosomal-stress-in-retinal-cells
#3
Gouri Yogalingam, Amanda R Lee, Donald S Mackenzie, Travis J Maures, Agnes Rafalko, Heather Prill, Geoffrey Berguig, Chuck Hague, Terri Christianson, Sean M Bell, Jonathon H LeBowitz
Neutrophil myeloperoxidase (MPO) catalyzes the H2O2-dependent oxidation of chloride anion to generate hypochlorous acid, a potent antimicrobial agent. Besides its well defined role in innate immunity, aberrant degranulation of neutrophils in several inflammatory diseases leads to redistribution of MPO to the extracellular space, where it can mediate tissue damage by promoting the oxidation of several additional substrates. Here, we demonstrate that mannose-6-phosphate (M6P) receptor-mediated cellular uptake and delivery of MPO to lysosomes of retinal pigmented epithelial (RPE) cells acts to clear this harmful enzyme from the extracellular space, with lysosomal-delivered MPO exhibiting a half-life of 10 hours...
January 23, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28064304/evaluation-of-ophthalmic-artery-branch-retrograde-intervention-in-the-treatment-of-central-retinal-artery-occlusion-crao
#4
Runsheng Wang, Lu Qian, Yi Wang, Yi Zheng, Shanshuang Du, Tao Lei, Peilin Lv, Tan Long, Wenjun Wang
BACKGROUND Central retinal artery occlusion (CRAO) is the occlusion of the central retinal artery resulting in retinal infarction and acute vision loss. Digital subtraction angiography (DSA)-guided superselective ophthalmic artery or selective carotid thrombolysis remains the preferred treatment method for CRAO. This study aimed to evaluate the safety and clinical efficacy of the novel ophthalmic artery branch retrograde thrombolytic intervention for CRAO. MATERIAL AND METHODS Fifty patients with monocular CRAO were enrolled, including 28 males and 22 females (mean age: 55...
January 8, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28003454/modulation-of-recognition-memory-performance-by-light-requires-both-melanopsin-and-classical-photoreceptors
#5
Shu K E Tam, Sibah Hasan, Steven Hughes, Mark W Hankins, Russell G Foster, David M Bannerman, Stuart N Peirson
Acute light exposure exerts various effects on physiology and behaviour. Although the effects of light on brain network activity in humans are well demonstrated, the effects of light on cognitive performance are inconclusive, with the size, as well as direction, of the effect depending on the nature of the task. Similarly, in nocturnal rodents, bright light can either facilitate or disrupt performance depending on the type of task employed. Crucially, it is unclear whether the effects of light on behavioural performance are mediated via the classical image-forming rods and cones or the melanopsin-expressing photosensitive retinal ganglion cells...
December 28, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/27893096/chemogenetic-activation-of-iprgcs-drives-changes-in-dark-adapted-scotopic-electroretinogram
#6
Nina Milosavljevic, Annette E Allen, Jasmina Cehajic-Kapetanovic, Robert J Lucas
Purpose: The purpose of this study was to investigate the impact of activating melanopsin-expressing intrinsically photosensitive retinal ganglion cells (ipRGCs) on dark-adapted (scotopic) electroretinograms (ERG). Methods: We used mice (Opn4Cre/+) expressing cre recombinase in melanopsin-expressing cells for a targeted gene delivery of a chemogenetic Gq-coupled receptor, hM3Dq, to ipRGCs. Intraperitoneal injection of clozapine N-oxide (CNO) at 5 mg/kg was used for acute activation of hM3Dq and thus excitation of ipRGCs in darkness...
November 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27769323/test-characteristics-of-point-of-care-ultrasonography-for-the-diagnosis-of-acute-posterior-ocular-pathology
#7
Michael Y Woo, Nathan Hecht, Bernard Hurley, David Stitt, Venkatesh Thiruganasambandamoorthy
OBJECTIVES: The objective of this study was to determine the test characteristics of point-of-care ultrasonography (POCUS) for the diagnosis of retinal tear (RT), retinal detachment (RD), posterior vitreous detachment (PVD), and vitreous hemorrhage (VH). DESIGN: A prospective observation study on a convenience sample of patients presenting to a tertiary care emergency general ophthalmology clinic was performed. PARTICIPANTS: Adult patients with acute flashes/floaters or new visual field defects were included (n = 62)...
October 2016: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/27647253/-is-glaucoma-a-mitochondrial-neurodegenerative-disease
#8
Z Zhang, J M Ma, N L Wang
The retinal ganglion cell, due to peculiar structural and energetic constraints, appears acutely susceptible to mitochondrial dysfunction. Emerging evidence suggests that changes in the mitochondrial DNA(mtDNA)and in nuclear DNA genes that encode mitochondrial proteins may influence mitochondrial structure and function and, therefore, contribute to the pathogenesis of primary open angle glaucoma. As the main glaucoma risk factors are elevated intraocular pressure and older age, we discuss their relationship with mitochondrial dysfunction...
September 11, 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27556216/acute-and-chronic-hyperglycemia-elicit-jip1-jnk-mediated-endothelial-vasodilator-dysfunction-of-retinal-arterioles
#9
Travis W Hein, Wenjuan Xu, Xin Xu, Lih Kuo
PURPOSE: Hyperglycemia, a hallmark of diabetes mellitus, is associated with retinal inflammation and impairment of endothelium-dependent nitric oxide (NO)-mediated dilation of retinal arterioles. However, molecular mechanisms involved in this diminished endothelial vasodilator function remain unclear. We examined whether inflammatory stress-activated kinases, c-Jun N-terminal kinase (JNK) and p38, contribute to retinal arteriolar dysfunction during exposure to acute and chronic hyperglycemia...
August 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27516733/aav-vectors-for-fret-based-analysis-of-protein-protein-interactions-in-photoreceptor-outer-segments
#10
Elvir Becirovic, Sybille Böhm, Ong N P Nguyen, Lisa M Riedmayr, Verena Hammelmann, Christian Schön, Elisabeth S Butz, Christian Wahl-Schott, Martin Biel, Stylianos Michalakis
Fluorescence resonance energy transfer (FRET) is a powerful method for the detection and quantification of stationary and dynamic protein-protein interactions. Technical limitations have hampered systematic in vivo FRET experiments to study protein-protein interactions in their native environment. Here, we describe a rapid and robust protocol that combines adeno-associated virus (AAV) vector-mediated in vivo delivery of genetically encoded FRET partners with ex vivo FRET measurements. The method was established on acutely isolated outer segments of murine rod and cone photoreceptors and relies on the high co-transduction efficiency of retinal photoreceptors by co-delivered AAV vectors...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27472185/20-40-or-better-visual-acuity-after-optic-neuritis-not-as-good-as-we-once-thought
#11
Sakinah B Sabadia, Rachel C Nolan, Kristin M Galetta, Kannan M Narayana, James A Wilson, Peter A Calabresi, Elliot M Frohman, Steven L Galetta, Laura J Balcer
BACKGROUND: Although patients with acute optic neuritis (ON) recover high-contrast visual acuity (HCVA) to 20/40 or better in 95% of affected eyes, patients with a history of ON continue to note subjective abnormalities of vision. Furthermore, substantial and permanent thinning of the retinal nerve fiber layer (RNFL) and the ganglion cell layer (GCL) is now known to occur early in the course of ON. We measured vision-specific quality of life (QOL) in patients with a history of acute ON and recovery of VA to 20/40 or better in their affected eyes to determine how these QOL scores relate to RNFL and GCL thickness and low-contrast letter acuity (LCLA) across the spectrum of visual recovery...
December 2016: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/27454223/retinal-vascular-development-with-0-312-mg-intravitreal-bevacizumab-to-treat-severe-posterior-retinopathy-of-prematurity-a-longitudinal-fluorescein-angiographic-study
#12
Birgit Lorenz, Knut Stieger, Melanie Jäger, Christine Mais, Susann Stieger, Monika Andrassi-Darida
PURPOSE: To report the outcome of intravitreal 0.312 mg bevacizumab (IVB) monotherapy in acute retinopathy of prematurity (ROP) and to describe the vascular development over time. METHODS: Seventeen prematurely born infants were treated with IVB (0.312 mg in 0.025 mL per eye) because of acute ROP in posterior Zone II or Zone I, including aggressive posterior ROP. Infants were examined by fluorescein angiography (FA) using RetCam II or III (Clarity Medical Systems Inc) before IVB (n = 21 eyes), within 6 weeks (n = 23 eyes), 8 to 13 weeks (n = 22 eyes), and up to 45 months (n = 10 eyes)...
January 2017: Retina
https://www.readbyqxmd.com/read/27441270/neuroprotective-effects-of-vcp-modulators-in-mouse-models-of-glaucoma
#13
Noriko Nakano, Hanako Ohashi Ikeda, Tomoko Hasegawa, Yuki Muraoka, Sachiko Iwai, Tatsuaki Tsuruyama, Masaki Nakano, Tomohiro Fuchigami, Toshiyuki Shudo, Akira Kakizuka, Nagahisa Yoshimura
Glaucoma is a major cause of adult blindness due to gradual death of retinal ganglion cells. Currently, no therapeutics are available for the protection of these cells from the cell death. We have recently succeeded in synthesizing novel compounds, KUSs (Kyoto University Substances), which can reduce cellular ATP consumption by specifically inhibiting the ATPase activities of VCP, a major ATPase in the cell, and we have shown that KUSs could mitigate the disease progression of rd10, a mouse model of retinitis pigmentosa, without any apparent side effects...
April 2016: Heliyon
https://www.readbyqxmd.com/read/27409477/oct-based-macular-structure-function-correlation-in-dependence-on-birth-weight-and-gestational-age-the-giessen-long-term-rop-study
#14
Wadim Bowl, Knut Stieger, Magdalena Bokun, Silke Schweinfurth, Kerstin Holve, Monika Andrassi-Darida, Birgit Lorenz
PURPOSE: To compare retinal layer thicknesses in preterm and term-born children using spectral-domain optical coherence tomography (SD-OCT) and to correlate structure with retinal function. METHODS: We performed SD-OCT single and volume scans in the foveal region of premature children aged 6 to 13 years without ROP (no-ROP, n = 100) and with spontaneously regressed ROP (sr-ROP, n = 50) documented with wide-angle digital imaging during routine screening for acute ROP, and 30 age-matched term-born children...
July 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27296490/outcomes-of-vogt-koyanagi-harada-disease-a-subanalysis-from-a-randomized-clinical-trial-of-antimetabolite-therapies
#15
Elizabeth Shen, Sivakumar R Rathinam, Manohar Babu, Anuradha Kanakath, Radhika Thundikandy, Salena M Lee, Erica N Browne, Travis C Porco, Nisha R Acharya
PURPOSE: To report outcomes of Vogt-Koyanagi-Harada (VKH) disease from a clinical trial of antimetabolite therapies. DESIGN: Subanalysis from an observer-masked randomized clinical trial for noninfectious intermediate, posterior, and panuveitis. METHODS: setting: Clinical practice at Aravind Eye Hospitals, India. PATIENT POPULATION: Forty-three of 80 patients enrolled (54%) diagnosed with VKH. INTERVENTION: Patients were randomized to either 25 mg oral methotrexate weekly or 1 g mycophenolate mofetil twice daily, with a corticosteroid taper...
August 2016: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/27273917/endophthalmitis-after-small-gauge-vitrectomy-a-retrospective-case-series-from-sweden
#16
MULTICENTER STUDY
Marcin Piotr Czajka, Eva Byhr, Göran Olivestedt, Eva M Olofsson
PURPOSE: To investigate the anatomical and functional outcomes of acute-onset endophthalmitis after small-gauge vitrectomy. METHODS: Retrospective case series of patients who underwent 23- or 25-gauge vitrectomy at four centres in Sweden between 2008 and 2012. Postvitrectomy endophthalmitis was identified through the search of the journal records of each institution, and the diagnosis was based on clinical criteria regardless of culture results. RESULTS: Twenty-four patients (24 eyes) were included...
December 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27271761/rescue-effects-of-intravenous-immunoglobulin-on-optic-nerve-degeneration-in-a-rat-model-of-neuromyelitis-optica
#17
Sho Nobuyoshi, Akiyasu Kanamori, Yoshiko Matsumoto, Makoto Nakamura
PURPOSE: Neuromyelitis optica (NMO) is an autoimmune inflammatory disease that predominantly attacks the optic nerve and spinal cord. This study evaluated the effect of administration of human IgG (hIgG) into the caudal vein on optic nerve degeneration in a rodent model of NMO. METHODS: The optic nerves were exposed to AQP4-Ab-positive sera, and the administration of intravenous immunoglobulin (IVIG) was performed immediately, at 7 days (cohort A) or at 7 days and 10 days (cohort B) after exposure to the sera...
September 2016: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27186591/idebenone-for-leber-s-hereditary-optic-neuropathy
#18
REVIEW
N Gueven
Idebenone is a rapidly absorbed, safe and well-tolerated drug and is currently the only clinically proven treatment option for Leber's hereditary optic neuropathy (LHON) patients. Idebenone (Raxone®) is approved by the European Medicines Agency for the treatment of LHON and has been available on the European market since 2015. Due to its molecular mode of action of bypassing the defective mitochondrial complex I, idebenone leads to improved energy supply and a functional recovery of retinal ganglion cells during the acute stage of the disease, thereby preventing further vision loss and promoting recovery of vision...
March 2016: Drugs of Today
https://www.readbyqxmd.com/read/27094636/anti-inflammatory-and-ultrastructural-effects-of-turkish-propolis-in-a-rat-model-of-endotoxin-induced-uveitis
#19
Salime Pelin Ertürküner, Elif Yaprak Saraç, Semil Selcen Göçmez, Hakan Ekmekçi, Zeynep Banu Öztürk, İsmail Seçkin, Özkan Sever, Kadircan Keskinbora
INTRODUCTION: Experimental animal models of acute uveitis, an inflammatory eye disease, can be established via endotoxin-induced inflammation. Propolis, a natural substance collected by honeybees from buds and tree exudates, has antioxidant, antibacterial, antiviral, and anti-inflammatory effects. We investigated the effects of propolis, obtained from the Sakarya province of Turkey, on endotoxin-induced uveitis using immunohistochemical, ultrastructural, and biochemical approaches. MATERIAL AND METHODS: Male Wistar albino rats (n = 6/group) received intraperitoneal (ip) lipopolysaccharide (LPS) endotoxin (150 μg/kg) followed by aqueous extract of propolis (50 mg/kg ip) or vehicle; two additional groups received either saline (control) or propolis only...
2016: Folia Histochemica et Cytobiologica
https://www.readbyqxmd.com/read/27055183/prevalence-of-age-related-macular-degeneration-in-chinese-american-adults-the-chinese-american-eye-study
#20
Rohit Varma, Farzana Choudhury, Sardius Chen, Shuang Wu, Chunyi Hsu, Mina Torres, Ronald Klein, Stanley P Azen, Roberta McKean-Cowdin
Importance: Population-based prevalence estimates of age-related macular degeneration (AMD) need to be determined to assess its burden among Chinese Americans, the fastest growing racial group in the United States. Objective: To determine the age- and sex- specific prevalence of AMD among Chinese Americans. Design: The Chinese American Eye Study (CHES) was conducted in a general urban community of 10 census tracts in Monterey Park, California...
April 7, 2016: JAMA Ophthalmology
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