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Retinal ganglion cell

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https://www.readbyqxmd.com/read/28811934/the-estimates-of-retinal-ganglion-cell-counts-performed-better-than-isolated-structure-and-functional-tests-for-glaucoma-diagnosis
#1
Bruno L B Esporcatte, Andrea C Kara-José, Luiz Alberto S Melo, Luciano M Pinto, Ivan M Tavares
PURPOSE: To evaluate the diagnostic accuracy of retinal ganglion cell (RGC) counts as estimated by combining data from standard automated perimetry (SAP) and spectral domain optical coherence tomography (SD-OCT). METHODS: Healthy individuals and glaucoma patients were included in this cross-sectional study. All eyes underwent 24-2 SITA SAP and structural imaging tests. RGC count estimates were obtained using a previously described algorithm, which combines estimates of RGC numbers from SAP sensitivity thresholds and SD-OCT retinal nerve fiber layer (RNFL) average thickness...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28811895/long-term-rearrangement-of-retinal-structures-in-a-novel-mutation-of-x-linked-retinoschisis
#2
Stefano Piermarocchi, Stefania Miotto, Davide Colavito, Elda Del Giudice, Alberta Leon, Veronica Maritan, Rita Piermarocchi, Alma Patrizia Tormene
The aim of the present study was to report a novel mutation in the retinoschisin 1 (RS1) gene in a Caucasian family affected by X-linked juvenile retinoschisis (XLRS) and to describe the long-term modification of retinal structure. Two brothers with an early onset maculopathy were diagnosed with XLRS. Fundus photography, fluorescein angiography, spectral domain optical coherence tomography and electroretinogram analyses were performed. Their sister was also examined. All subjects were screened for mutations in the RS1 gene...
September 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28811386/trimetazidine-protects-retinal-ganglion-cells-from-acute-glaucoma-via-the-nrf2-ho-1-pathway
#3
Peixing Wan, Wenru Su, Yingying Zhang, Zhidong Li, Caibin Deng, Yehong Zhuo
Acute glaucoma is one of the leading causes of irreversible vision impairment characterized by the rapid elevation of intraocular pressure and consequent retinal ganglion cell (RGC) death. Oxidative stress and neuro-inflammation have been considered critical for the pathogenesis of RGC death in acute glaucoma. Trimetazidine (TMZ), an anti-ischemic drug, possesses anti-oxidative and anti-inflammatory properties, contributing to its therapeutic potential in tissue damage. However, the role of TMZ in acute glaucoma and the underlying molecular mechanisms remain elusive...
August 15, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28810623/evaluation-of-heat-shock-protein-hsp-72-expression-in-retinal-ganglion-cells-of-rats-with-glaucoma
#4
Guo-Hua Wang, Yi-Qiao Xing
The present study was planned to observe the expression of heat shock protein 72 (HSP72) in retina of rats in a glaucoma model. A total of 50 Wistar rats were randomly divided into the high intraocular tension group (glaucoma model) and the sham control (sham operation) group. Glaucoma rat models were created by application of electrocoagulation on at least three groups of veins, reduction of venous return of aqueous humor and by enhancement of intraocular tension at the same time; 1, 2, 3, 4 and 8 weeks after operation, the intraocular tension of rats was observed respectively, and the expression/distribution of HSP72 in retina was assessed by immunohistochemical detection...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810265/viral-retinopathy-in-experimental-models-of-zika-infection
#5
Zhenyang Zhao, Matthew Yang, Sasha R Azar, Lynn Soong, Scott C Weaver, Jiaren Sun, Yan Chen, Shannan L Rossi, Jiyang Cai
Purpose: Emerging evidence has shown that both congenital and adult Zika virus (ZIKV) infection can cause eye diseases. The goals of the current study were to explore mechanisms and pathophysiology of ZIKV-induced eye defects. Methods: Wild-type or A129 interferon type I receptor-deficient mice were infected by either FSS13025 or Mex1-7 strain of ZIKV. Retinal histopathology was measured at different time points after infection. The presence of viral RNA and protein in the retina was determined by in situ hybridization and immunofluorescence staining, respectively...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28808786/inhibition-of-tlr4-alleviates-the-inflammation-and-apoptosis-of-retinal-ganglion-cells-in-high-glucose
#6
Lili Hu, Hongxia Yang, Ming Ai, Shuanghong Jiang
PURPOSE: To investigate the expression profiles of Toll-like receptor 4 (TLR4), the effect of TLR4 on inflammation, and apoptosis of retinal ganglion cells (RGCs) cultured in high glucose and the underlying mechanism. METHODS: A high-glucose model was established in RGCs isolated from Sprague-Dawley (SD) rats (2-3 days old) and identified with Brn3a. Primary cultured RGCs were divided into control (0 mM), HG1 (10 mM glucose), HG2 (20 mM glucose), HG3 (30 mM glucose), HG (20 mM glucose) + TAK-242 (1...
August 14, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28808277/age-and-sex-dependency-of-the-association-between-systemic-antioxidant-potential-and-glaucomatous-damage
#7
Yoshimi Asano, Noriko Himori, Hiroshi Kunikata, Mai Yamazaki, Yukihiro Shiga, Kazuko Omodaka, Hidetoshi Takahashi, Toru Nakazawa
Systemic oxidative stress is thought to be an important factor in the pathogenesis of glaucoma. In particular, low systemic antioxidative capacity, which normally counters oxidative stress, may contribute to glaucoma. Thus, we investigated the association between biological antioxidant potential (BAP), a biomarker of systemic antioxidative capacity, and glaucoma severity in patients with open-angle glaucoma (OAG). This study included 480 eyes of 240 patients with OAG and 66 healthy control eyes. We measured the BAP serum level with a free radical analyzer and compared it with a weighted estimate of the number of retinal ganglion cells (wrgc), derived from circumpapillary retinal nerve fiber layer thickness and visual field mean deviation...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807567/a-new-promoter-allows-optogenetic-vision-restoration-with-enhanced-sensitivity-in-macaque-retina
#8
Antoine Chaffiol, Romain Caplette, Céline Jaillard, Elena Brazhnikova, Mélissa Desrosiers, Elisabeth Dubus, Laëtitia Duhamel, Emilie Macé, Olivier Marre, Patrick Benoit, Philippe Hantraye, Alexis-Pierre Bemelmans, Ernst Bamberg, Jens Duebel, José-Alain Sahel, Serge Picaud, Deniz Dalkara
The majority of inherited retinal degenerations converge on the phenotype of photoreceptor cell death. Second- and third-order neurons are spared in these diseases, making it possible to restore retinal light responses using optogenetics. Viral expression of channelrhodopsin in the third-order neurons under ubiquitous promoters was previously shown to restore visual function, albeit at light intensities above illumination safety thresholds. Here, we report (to our knowledge, for the first time) activation of macaque retinas, up to 6 months post-injection, using channelrhodopsin-Ca(2+)-permeable channelrhodopsin (CatCh) at safe light intensities...
July 20, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28806189/the-use-of-optical-coherence-tomography-in-neuro-ophthalmology
#9
Noel C Y Chan, Carmen K M Chan
PURPOSE OF REVIEW: In the last decade, with the advances of optical coherence tomography (OCT) technology, different imaging protocols and analysis algorithms have been introduced to maximize the potential of this diagnostic tool in the evaluation of different eye diseases. This review aims to provide an update on these additional features, with respect to the management of a diverse range of neuro-ophthalmologic conditions. RECENT FINDINGS: Macular ganglion cell complex (mGCC) analysis has been shown to be superior to peripapillary retinal nerve fiber layer (pRNFL) analysis in certain settings, such as differentiating Leber's hereditary optic neuropathy from functional visual loss; monitoring neurodegenerative diseases or multiple sclerosis; and predicting visual loss in nonarteritic ischemic optic neuropathy...
August 12, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28803066/a-novel-ripk1-inhibitor-that-prevents-retinal-degeneration-in-a-rat-glaucoma-model
#10
Yun-Ju Do, Jee-Won Sul, Ki-Hong Jang, Nam Sook Kang, Young-Hoon Kim, Young-Gwan Kim, Eunhee Kim
In glaucoma, retinal ganglion cells (RGCs) are exposed to ischemic stress with elevation of the intraocular pressure and are subsequently lost. Necroptosis, a type of regulated necrosis, is known to play a pivotal role in this loss. We observed that receptor-interacting protein kinase 1 (RIPK1), the key player of necroptosis, was activated by diverse ischemic stresses, including TCZ, chemical hypoxia (CH), and oxygen glucose deprivation (OGD). In this study, we introduce a RIPK1-inhibitory compound (RIC) with a novel scaffold...
August 9, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28801634/mapping-physiological-inputs-from-multiple-photoreceptor-systems-to-dopaminergic-amacrine-cells-in-the-mouse-retina
#11
Xiwu Zhao, Kwoon Y Wong, Dao-Qi Zhang
In the vertebrate retina, dopamine is synthesized and released by a specialized type of amacrine cell, the dopaminergic amacrine cell (DAC). DAC activity is stimulated by rods, cones, and melanopsin-expressing intrinsically photosensitive retinal ganglion cells upon illumination. However, the relative contributions of these three photoreceptor systems to the DAC light-induced response are unknown. Here we found that rods excite dark-adapted DACs across a wide range of stimulation intensities, primarily through connexin-36-dependent rod pathways...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800629/protective-effects-on-the-retina-after-ranibizumab-treatment-in-an-ischemia-model
#12
Stephanie C Joachim, Marina Renner, Jacqueline Reinhard, Carsten Theiss, Caroline May, Stephanie Lohmann, Sabrina Reinehr, Gesa Stute, Andreas Faissner, Katrin Marcus, H Burkhard Dick
Retinal ischemia is common in eye disorders, like diabetic retinopathy or retinal vascular occlusion. The goal of this study was to evaluate the potential protective effects of an intravitreally injected vascular endothelial growth factor (VEGF) inhibitor (ranibizumab) on retinal cells in an ischemia animal model via immunohistochemistry (IF) and quantitative real-time PCR (PCR). A positive binding of ranibizumab to rat VEGF-A was confirmed via dot blot. One eye underwent ischemia and a subgroup received ranibizumab...
2017: PloS One
https://www.readbyqxmd.com/read/28799222/progression-retinal-ganglion-cell-loss-in-multiple-sclerosis-is-associated-with-new-lesions-in-the-optic-radiations
#13
Alexander Klistorner, Elizabeth C Graham, Con Yiannikas, Michael Barnett, John Parratt, Ray Garrick, Chenyu Wang, Yuyi You, Stuart L Graham
BACKGROUND: The mechanism of retinal ganglion cell (RGC) and retinal nerve fibre layer (RNFL) loss in multiple sclerosis (MS) remains unknown. This study aims to investigate the association between temporal RNFL (tRNFL) thinning and disease activity in the brain determined by T2 lesions on MRI. METHODS: 55 consecutive relapsing-remitting MS (RRMS) patients and 25 controls were enrolled. All patients underwent annual optical coherence tomography (OCT) and high-resolution MRI scans for tRNFL thickness and brain lesion volume analysis, respectively...
August 10, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28797550/optical-coherence-tomography-angiography-of-the-peripapillary-retina-in-primary-angle-closure-glaucoma
#14
Shunhua Zhang, Chan Wu, Liang Liu, Yali Jia, Yao Zhang, Yang Zhang, Hua Zhang, Yong Zhong, David Huang
PURPOSE: To measure the change of peripapillary retinal vessel density (VD) in eyes with a history of acute primary angle closure glaucoma (PACG). DESIGN: Case-control study. METHODS: Twenty-one consecutive Chinese patients with history of unilateral acute PACG were enrolled. Eyes with acute PACG constituted the case group, while the contralateral eyes without attack constituted the control. All patients underwent ophthalmic examinations including best-corrected visual acuity, intraocular pressure, and visual field (VF)...
August 7, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28796875/optical-coherence-tomography-analysis-based-prediction-of-humphrey-24-2-visual-field-thresholds-in-patients-with-glaucoma
#15
Zhihui Guo, Young H Kwon, Kyungmoo Lee, Kai Wang, Andreas Wahle, Wallace L M Alward, John H Fingert, Daniel I Bettis, Chris A Johnson, Mona K Garvin, Milan Sonka, Michael D Abràmoff
Purpose: A pilot study showed that prediction of individual Humphrey 24-2 visual field (HVF 24-2) sensitivity thresholds from optical coherence tomography (OCT) image analysis is possible. We evaluate performance of an improved approach as well as 3 other predictive algorithms on a new, fully independent set of glaucoma subjects. Methods: Subjects underwent HVF 24-2 and 9-field OCT (Heidelberg Spectralis) testing. Nerve fiber (NFL), and ganglion cell and inner plexiform (GCL+IPL) layers were cosegmented and partitioned into 52 sectors matching HVF 24-2 test locations...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28795960/advances-in-experimental-optic-nerve-regeneration
#16
Bo Young Chun, Dean M Cestari
PURPOSE OF REVIEW: Recent advances in experimental studies of optic nerve regeneration to better understand the pathophysiology of axon regrowth and provide insights into the future treatment of numerous optic neuropathies. RECENT FINDINGS: The optic nerve is part of the central nervous system and cannot regenerate if injured. There are several steps that regenerating axons of retinal ganglion cells (RGCs) must take following optic nerve injury that include: maximizing the intrinsic growth capacity of RGCs, overcoming the extrinsic growth-inhibitory environment of the optic nerve, and optimizing the reinnervation of regenerated axons to their targets in the brain...
August 8, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28795358/psychophysical-measurements-of-luminance-contrast-sensitivity-and-color-discrimination-with-transparent-and-blue-light-filter-intraocular-lenses
#17
Marcelo Fernandes da Costa, Augusto Paranhos Júnior, Claudio Luiz Lottenberg, Leonardo Cunha Castro, Dora Fix Ventura
INTRODUCTION: The purpose of this study was to measure luminance contrast sensitivity and color vision thresholdfs in normal subjects using a blue light filter lens and transparent intraocular lens material. METHODS: Monocular luminance grating contrast sensitivity was measured with Psycho for Windows (version 2.36; Cambridge Research Systems) at 3.0, 6.0, 12.0, 20.0, and 30.0 cycles per degree of visual angle (cpd) in 15 normal subjects (eight female), with a mean age of 21...
August 9, 2017: Ophthalmology and Therapy
https://www.readbyqxmd.com/read/28795295/predictive-value-of-n95-waveforms-of-pattern-electroretinograms-pergs-in-children-with-optic-nerve-hypoplasia-onh
#18
Daphne McCulloch, Pamela Garcia-Filion, Cassandra Fink, Anthony C Fisher, Antonio Eleuteri, Mark S Borchert
PURPOSE: As part of a long-term, prospective study of prenatal and clinical risk factors for optic nerve hypoplasia (ONH) at Children's Hospital Los Angeles, pattern ERGs (PERGs) were evaluated for prognostic value using an automated objective and robust analytical method. METHODS: Participants were 33 children with ophthalmoscopically diagnosed ONH [disc diameter-to-disc macula ratio (DD/DM) less than 0.35 in one or both eyes on fundus photographs]. Using cycloplegia and chloral hydrate sedation in one session before 26 months of age, we recorded PERGs to checkerboard reversal using five check sizes...
August 9, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28794130/mutations-in-scaper-cause-autosomal-recessive-retinitis-pigmentosa-with-intellectual-disability
#19
Yasmin Tatour, Iker Sanchez-Navarro, Elana Chervinsky, Hakon Hakonarson, Haithum Gawi, Saoud Tahsin-Swafiri, Rina Leibu, Maria Isabel Lopez-Molina, Guillermo Fernandez-Sanz, Carmen Ayuso, Tamar Ben-Yosef
BACKGROUND: Retinitis pigmentosa (RP) is the most common form of inherited retinal dystrophy, with a worldwide prevalence of 1 in 4000 persons. While in most cases of RP, the disease is limited to the eye (non-syndromic), over 40 forms of syndromic RP have been described. OBJECTIVES: To identify the genetic basis for syndromic RP in three unrelated families from Israel and Spain. METHODS: Whole exome sequencing was conducted in one Israeli and two Spanish families segregating autosomal recessive RP with intellectual disability...
August 9, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28794076/swept-source-oct-angiography-imaging-of-the-macular-capillary-network-in-glaucoma
#20
Handan Akil, Vikas Chopra, Mayss Al-Sheikh, Khalil Ghasemi Falavarjani, Alex S Huang, SriniVas R Sadda, Brian A Francis
PURPOSE: To evaluate the macular capillary network density of superficial and deep retinal layers (SRL/DRL) by swept-source optical coherence tomography angiography (OCTA) in patients with primary open angle glaucoma (POAG) and to compare the results with those of normal subjects. METHOD: In this prospective study, 24 eyes of 24 normal individuals and 24 eyes of 24 patients with mild to moderate POAG underwent fovea centred 6×6 mm cube macular OCTA imaging by a swept-source OCTA device (Triton, Topcon, Tokyo, Japan)...
August 9, 2017: British Journal of Ophthalmology
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