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Jovi C Y Wong, Nicola J Smyllie, Gareth T Banks, Carina A Pothecary, Alun R Barnard, Elizabeth S Maywood, Aarti Jagannath, Steven Hughes, Gijsbertus T J van der Horst, Robert E MacLaren, Mark W Hankins, Michael H Hastings, Patrick M Nolan, Russell G Foster, Stuart N Peirson
Cryptochromes 1 and 2 (CRY1/2) are key components of the negative limb of the mammalian circadian clock. Like many peripheral tissues, Cry1 and -2 are expressed in the retina, where they are thought to play a role in regulating rhythmic physiology. However, studies differ in consensus as to their localization and function, and CRY1 immunostaining has not been convincingly demonstrated in the retina. Here we describe the expression and function of CRY1 and -2 in the mouse retina in both sexes. Unexpectedly, we show that CRY1 is expressed throughout all retinal layers, whereas CRY2 is restricted to the photoreceptor layer...
March 21, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Haruna Suzuki-Kerr, Toshiro Iwagawa, Hiroshi Sagara, Atsushi Mizota, Yutaka Suzuki, Sumiko Watanabe
During development of the retina, common retinal progenitor cells give rise to six classes of neurons that subsequently further diversify into more than 55 subtypes of neuronal subtypes. Here, we have investigated the expression and function of Fezf2, Fez zinc finger family of protein, in the developing mouse retina. Expression of Fezf2 transcripts was strongly observed in the embryonic retinal progenitors at E14 and declined quickly in subsequent development of retina. Then, in postnatal stage at around day 8, Fezf2 was transiently expressed then declined again...
March 17, 2018: Experimental Eye Research
Jesse D Sengillo, Winston Lee, Takayuki Nagasaki, Kaspar Schuerch, Lawrence A Yannuzzi, K Bailey Freund, Janet Sparrow, Rando Allikmets, Stephen H Tsang
PURPOSE: Mutations in the eyes shut homolog (EYS) gene are a frequent cause of autosomal recessive retinitis pigmentosa (arRP). This study used multi-modal retinal imaging to elucidate genotype-phenotype relationships in EYS-related RP (EYS-RP). DESIGN: Cross-sectional study. METHOD: Multimodal retinal imaging and electrophysiologic testing was assessed for 16 patients with genetic confirmation of EYS-RP. RESULTS: A total of 27 unique EYS variants were identified in 16 patients...
March 14, 2018: American Journal of Ophthalmology
Peng Yong Sim, V Swetha E Jeganathan, Alan F Wright, Peter Cackett
This case report depicts the clinical course of a female patient with unilateral retinitis pigmentosa, who first presented at the age of 12 years. Fundus photography at the time revealed unilateral pigmentary retinopathy, which was associated with extinguished electroretinogram (ERG) signal. At 35 years of age, fundus examination revealed deterioration of pre-existing unilateral pigmentary retinopathy with progressive visual field defect detected on Goldmann visual field testing. ERG findings remained unchanged and multifocal ERG showed unilateral decrease in amplitude in the affected eye...
March 15, 2018: BMJ Case Reports
O A Konikova, V V Brzhesky
Visual impairment in children with regressive retinopathy of prematurity (ROP) are diverse and widespread. PURPOSE: to describe the electrophysiological characteristics of the retina in children with I-V stages of regressive ROP. MATERIAL AND METHODS: The study included children with stages I-V aged 5 to 17 (in the disease stages of IV and V - with reattachment of the retina after surgical treatment of its detachment). Patients with concomitant diseases of the eye were excluded from the study...
2018: Vestnik Oftalmologii
Haiyun Ye, Minzhong Yu, Lin Lu, Chenjin Jin, Guangwei Luo
Panretinal photocoagulation (PRP) is a standard method for proliferative diabetic retinopathy (PDR) treatment. However, conventional PRP usually significantly damages the retinal structure and vision. Retinal pattern scanning laser (PASCAL) photocoagulation has emerged as a new technique with fewer complications for the treatment of retinal disorders. This study compares the therapeutic effects of short-pulse PASCAL to conventional single-spot PRP for PDR. Fifty-two PDR patients (104 eyes) were randomly assigned into a short-pulse PASCAL-PRP treatment (SP) group and a conventional PRP treatment (TP) group...
March 15, 2018: Lasers in Medical Science
Gen Miura, Takayuki Baba, Toshiyuki Oshitari, Shuichi Yamamoto
Purpose: The aim of this study is to determine the effect of pupil size of eyes with cataracts on the flicker electroretinograms (ERGs) elicited and recorded with the RETeval system. Patients and methods: Forty-one eyes of 41 patients (mean age, 76.5±7.3 years) that had grade 2 nuclear or cortical cataract without any other abnormalities were studied. Flicker ERGs were recorded before and after mydriatic drops instillation. The ERGs were elicited by the white light delivered at the frequency of 28...
2018: Clinical Ophthalmology
Haiting Chen, Huifang Wang, Jianbin An, Qingli Shang, Jingxue Ma
BACKGROUND This study aimed to explore the effects of plumbagin (PLB) on epithelial-to-mesenchymal transition in retinal pigment epithelial (RPE) cells and in proliferative vitreoretinopathy (PVR) rabbit models. MATERIAL AND METHODS Rabbit RPE cells were exposed to various concentrations (0, 5, 15, and 25 µM) of PLB. Motility, migration, and invasion of PLB-treated cells were determined in vitro using Transwell chamber assays and scratch wound assays. The contractile ability was evaluated by cell contraction assay...
March 13, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Vasily Mikhaïlovitch Smirnov, Christina Zeitz, Nagasamy Soumittra, Isabelle Audo, Sabine Defoort-Dhellemmes
INTRODUCTION: CABP4-related retinal dysfunction is a cone-rod synaptic transmission disorder with electronegative electroretinogram (ERG) waveform. It is a rare retinal dysfunction that can be classified into the incomplete form of congenital stationary night blindness. Absent foveal reflex and overall foveal thinning were previously reported, but in most cases the fundus appearance was described as nearly normal. We report here peculiar macular changes in a patient of French ancestry harbouring CABP4 mutations...
March 10, 2018: Documenta Ophthalmologica. Advances in Ophthalmology
Virginia Miraldi Utz, Wanda Pfeifer, Susannah Q Longmuir, Richard John Olson, Kai Wang, Arlene V Drack
Importance: Congenital stationary night blindness (CSNB) implies a stable condition, with the major symptom being nyctalopia present at birth. Pediatric clinical presentation and the course of different genetic subtypes of CSNB have not, to our knowledge, been well described in the era of molecular genetic diagnosis. Objective: To describe the presentation and longitudinal clinical characteristics of pediatric patients with molecularly confirmed TRPM1-associated complete CSNB (cCSNB)...
March 8, 2018: JAMA Ophthalmology
Ryo Mukai, Yoko Okunuki, Deeba Husain, Clifford B Kim, John D Lambris, Kip M Connor
The complement system is a key component of innate immunity comprised of soluble components that form a proteolytic cascade leading to the generation of effector molecules involved in cellular clearance. This system is highly activated not only under general inflammatory conditions such as infections, collagen diseases, nephritis, and liver diseases, but also in focal ocular diseases. However, little is known about the role of the complement system in retinal homeostasis during aging. Using young (6-week-old) and adult (6-month-old) mice in wild type (C57BL/6) and complement knockout strains ( C1q -/- , Mbl a/c -/- , Fb -/- , C3 -/- , and C5 -/- ), we compared amplitudes of electroretinograms (ERG) and thicknesses of retinal layers in spectral domain optical coherence tomography between young and adult mice...
2018: Frontiers in Aging Neuroscience
A Guiot, M Couturier, J G Tebib, L Abouaf, F Coury
INTRODUCTION: Antimalarial drugs are largely used for the treatment of various systemic diseases. They can cause toxic retinopathy, which can lead to blindness. OBSERVATION: We report the case of a 32-year-old male with a systemic lupus erythematosus treated with hydroxychloroquine 400mg per day and then chloroquine 300mg per day during 8 and 9years respectively. Eighteen months after his latest visual examination, the patient experienced bilateral vision loss. Fundus examination revealed a bull's eye maculopathy...
February 26, 2018: La Revue de Médecine Interne
Fatoumata Yanoga, Ronald C Gentile, Toco Y P Chui, K Bailey Freund, Millie Fell, Rosa Dolz-Marco, Richard B Rosen
BACKGROUND/PURPOSE: To report a case of persistent retinal toxicity associated with a high dose of sildenafil citrate intake. METHODS: Single retrospective case report. RESULTS: A 31-year-old white man with no medical history presented with complaints of bilateral multicolored photopsias and erythropsia (red-tinted vision), shortly after taking sildenafil citrate-purchased through the internet. Patient was found to have cone photoreceptor damage, demonstrated using electroretinogram, optical coherence tomography, and adaptive optics imaging...
February 27, 2018: Retinal Cases & Brief Reports
Saeed Karimi, Homayoun Nikkhah, Hamid Ahmadieh, Sare Safi
PURPOSE: The purpose of this study was to evaluate the safety and efficacy of intravitreal propranolol for the management of retinal capillary hemangioma in a patient with Von Hippel-Lindau. METHODS: Two intravitreal injections of 50 μg/0.05 mL propranolol were administered 6 weeks apart in the left eye of a 26-year-old patient with bilateral multiple retinal capillary hemangiomas. Safety and response to therapy were evaluated using electroretinogram, fluorescein angiography, and measurement of visual acuity...
February 19, 2018: Retinal Cases & Brief Reports
Paul J Bonezzi, Maureen E Stabio, Jordan M Renna
PURPOSE: Photoreceptors in the mouse retina express much of the molecular machinery necessary for phototransduction and glutamatergic transmission prior to eye opening at postnatal day 13 (P13). Light responses have been observed collectively from rod and cone photoreceptors via electroretinogram recordings as early as P13 in mouse, and the responses are known to become more robust with maturation, reaching a mature state by P30. Photocurrents from single rod outer segments have been recorded at P12, but no earlier, and similar studies on cone photoreceptors have been done, but only in the adult mouse retina...
February 15, 2018: Current Eye Research
Kirti M Jasani, Neil R A Parry, Graeme Black, Simon P Kelly
Gyrate atrophy is a rare autosomal recessive disorder caused by a mutation in the ornithine-δ-amino transferase gene. We present an interesting case of a 33-year-old woman who presented with increasing myopia, nyctalopia and failing vision. Examination revealed posterior subscapsular cataracts, narrowed peripheral visual fields and scalloped atrophic peripheral chorioretinal lesions. Blood investigations showed a raised plasma ornithine level at 917 μmol/L (normal range: 32-88 μmol/L) confirming the diagnosis of gyrate atrophy...
February 5, 2018: BMJ Case Reports
Kang Li, Shengxu Liu, Xiufeng Zhong, Jian Ge
PURPOSE: To assess the appropriate dose of sodium nitroprusside for establishing acute retinal photoreceptor degeneration models in rabbits. METHODS: Sodium nitroprusside (SNP) was delivered intravitreously. Sixteen New Zealand White rabbits are divided into four groups randomly: 0.1 mM, 0.25 mM, 0.5 mM SNP intravitreal injection group (experimental groups), and normal saline intravitreal injection group (control group). Assessments included weight, anterior segment photography, fundus photography, Hematoxylin-eosin staining, immunofluorescence, multi-focal electroretinogram (mfERG) and pupillary direct light reflex were performed at baseline and day 28 after injection...
2018: American Journal of Translational Research
Ahmed Dellaa, Maha Benlarbi, Imane Hammoum, Nouha Gammoudi, Mohamed Dogui, Riadh Messaoud, Rached Azaiz, Ridha Charfeddine, Moncef Khairallah, Pierre Lachapelle, Rafika Ben Chaouacha-Chekir
PURPOSE: Type 2 diabetic retinopathy is the main cause of acquired blindness in adults. The aim of this work was to examine the retinal function of the sand rat Psammomys obesus as an animal model of diet-induced type 2 diabetes when subjected to a hypercaloric regimen. MATERIALS AND METHODS: Hyperglycemia was induced in Psammomys obesus by high caloric diet (4 kcal/g). The visual function of control (n = 7) and diabetic (n = 7) adult rodents were followed up during 28 consecutive weeks with full-field electroretinogram(ERG) recordings evoked to flashes of white light according to the standard protocol of the International Society for Clinical Electrophysiology of Vision protocol (ISCEV)...
2018: PloS One
Jesse D Sengillo, Winston Lee, Colleen G Bilancia, Vaidehi Jobanputra, Stephen H Tsang
PURPOSE: To report an unusual phenotype of retinitis pigmentosa (RP) caused by compound heterozygous mutations in SPATA7, and describe the progression over a two year follow-up period. METHODS: Retrospective case study. RESULTS: A 63-year-old man with a long history of nyctalopia, progressive visual field constriction, and a recent subacute decrease in visual acuity of the left eye presented for evaluation of a suspected retinal degeneration...
February 6, 2018: Documenta Ophthalmologica. Advances in Ophthalmology
Amanda M Mui, Victoria Yang, Moe H Aung, Jieming Fu, Adewumi N Adekunle, Brian C Prall, Curran S Sidhu, Han Na Park, Jeffrey H Boatright, P Michael Iuvone, Machelle T Pardue
Visual experience during the critical period modulates visual development such that deprivation causes visual impairments while stimulation induces enhancements. This study aimed to determine whether visual stimulation in the form of daily optomotor response (OMR) testing during the mouse critical period (1) improves aspects of visual function, (2) involves retinal mechanisms and (3) is mediated by brain derived neurotrophic factor (BDNF) and dopamine (DA) signaling pathways. We tested spatial frequency thresholds in C57BL/6J mice daily from postnatal days 16 to 23 (P16 to P23) using OMR testing...
2018: PloS One
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