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https://www.readbyqxmd.com/read/28315677/rimonabant-a-selective-cannabinoid1-receptor-antagonist-protects-against-light-induced-retinal-degeneration-in-vitro-and-in-vivo
#1
Tomoyo Imamura, Kazuhiro Tsuruma, Yuki Inoue, Tomohiro Otsuka, Yuta Ohno, Shiho Ogami, Shinsaku Yamane, Masamitsu Shimazawa, Hideaki Hara
The endocannabinoid system is involved in some neurodegenerative diseases such as Alzheimer's disease. An endogenous constellation of proteins related to cannabinoid1 receptor signaling, including free fatty acids, diacylglycerol lipase, and N-acylethanolamine-hydrolyzing acid amidase, are localized in the murine retina. Moreover, the expression levels of endogenous agonists of cannabinoid receptors are changed in the vitreous fluid. However, the role of the endocannabinoid system in the retina, particularly in the light-induced photoreceptor degeneration, remains unknown...
March 15, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28306625/visualization-of-the-retina-and-vitreous-during-vitreoretinal-surgery-new-technologies
#2
Sarah P Read, Jorge A Fortun
PURPOSE OF REVIEW: Visualization remains a critical factor in successful ocular surgery.Here we review new technology that has the potential to allow for safer and more efficient retinal surgery. RECENT FINDINGS: Vitreoretinal surgery poses unique visualization challenges such as the need for specialized optical systems and the delicate and microscopic features of retinal structures. Better retinal visualization allows for new approaches to increasingly complex retinal cases...
March 16, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28304388/pirfenidone-inhibits-post-traumatic-proliferative-vitreoretinopathy
#3
B N M K Khanum, R Guha, V P Sur, S Nandi, S K Basak, A Konar, S Hazra
PurposeThe purpose of the study was to evaluate the efficacy and safety of intravitreal pirfenidone for inhibition of proliferative vitreoretinopathy (PVR) in a model of penetrating ocular injury.Patients and methodsPenetrating trauma was induced on the retina of rabbit and treated either with 0.1 ml of phosphate-buffered saline (PBS) or 0.1 ml of 0.5% pirfenidone, and development of PVR was evaluated clinically and graded after 1 month. Histopathology and immunohistochemistry with transforming growth factor beta (TGFβ), alpha smooth muscle actin (αSMA), and collagen-1 were performed to assess the fibrotic changes...
March 17, 2017: Eye
https://www.readbyqxmd.com/read/28304243/retinal-a2a-and-a3-adenosine-receptors-modulate-the-components-of-the-rat-electroretinogram
#4
Gudmundur Jonsson, Thor Eysteinsson
Adenosine is a neuromodulator present in various areas of the central nervous system, including the retina. Adenosine may serve a neuroprotective role in the retina, based on electroretinogram (ERG) recordings from the rat retina. Our purpose was to assess the role of A2A and A3 adenosine receptors in the generation and modulation of the rat ERG. The flash ERG was recorded with corneal electrodes from Sprague Dawley rats. Agonists and antagonists for A2A and A3 receptors, and adenosine were injected (5 µl) into the vitreous...
January 2017: Visual Neuroscience
https://www.readbyqxmd.com/read/28302681/ultrasound-biomicroscopic-imaging-in-paediatric-ocular-toxocariasis
#5
Jinghua Liu, Songfeng Li, Guangda Deng, Wenli Yang, Wei Chen, Hai Lu
PURPOSE: To determine the potential and usefulness of ultrasound biomicroscopy (UBM) as a diagnostic procedure on a larger cohort of paediatric patients with ocular toxocariasis. METHODS: UBM was performed on 41 eyes of 41 patients with ocular toxocariasis in order to determine configuration of peripheral retina, pars plana and vitreous. Location and range of peripheral pathology using ophthalmoscopy with scleral indentation, UBM and intraoperative confirmation were recorded and compared...
March 16, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28299011/management-of-giant-retinal-tear-detachments
#6
REVIEW
Maria H Berrocal, Megan L Chenworth, Luis A Acaba
Giant retinal tears (GRTs) are full-thickness circumferential tears of more than 90 degrees of the retina that are associated with vitreous detachment. They are related to ocular trauma, high myopia, aphakia, pseudophakia, genetic mutations involving collagen and young age. GRTs comprise 1.5% of all rhegmatogenous retinal detachments and the average age of incidence is 42 years. GRTs are more common in males, as 72% of all cases occur in males. The incidence of GRTs in the general population is estimated to be 0...
January 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28297042/combination-surgery-with-transcorneal-microincision-vitrectomy-surgery-and-intrascleral-intraocular-lens-fixation-for-spontaneous-intraocular-lens-luxation
#7
Kenichi Kohzaki, Hisato Gunji, Hiroshi Tsuneoka
To present a combination technique for two cases of in-the-bag intraocular lens (IOL) luxation into the vitreous cavity. Vitrectomy was performed via a cornea microincision vitrectomy system, and the luxated IOL was fixed into the sclera. IOL fixation is simple from no trocar cannulas and less disrupted conjunctiva. Postoperative corneal endothelial cell density in Case 1 and Case 2 were reduced by -2.1% and -5.1%, respectively. Postoperative frequency of hexagon was decreased in Case 1 but maintained in Case 2...
March 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28297038/scleral-autograft-for-optic-nerve-head-pit-associated-chronic-maculopathy
#8
Parag K Shah, Smita S Karandikar, Venkatapathy Narendran
Chronic macular edema is a common finding seen in optic nerve head pits. There is no universally accepted modality present for this condition. Herein, the authors describe a novel surgical technique where a scleral autograft is used to plug the optic pit after microincision vitreous surgery. [Ophthalmic Surg Lasers Imaging Retina. 2017;48:251-254.].
March 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28297034/the-role-of-posterior-vitreous-detachment-and-vitreomacular-adhesion-in-patients-with-age-related-macular-degeneration
#9
Orhan Ilim, Cezmi Akkin, Zafer Oztas, Serhad Nalcaci, Filiz Afrashi, Cumali Degirmenci, Jale Mentes
BACKGROUND AND OBJECTIVE: The aim of this study was to assess the prevalence of posterior vitreous detachment (PVD) and vitreoretinal interface in patients with age-related macular degeneration (AMD). PATIENTS AND METHODS: This clinical trial included 206 eyes of 138 patients who presented to the authors' clinic between January 2012 and November 2014. Patients were divided into three groups: 98 eyes of 67 patients with exudative AMD, 55 eyes of 36 patients with nonexudative AMD, and 53 eyes of 35 patients having no vitreoretinal disease...
March 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28282697/-initial-clinical-experiences-using-ocriplasmin-for-the-treatment-of-vitreomacular-traction-with-or-without-a-macular-hole
#10
J Lenk, E Matthé, S Ventzke, L E Pillunat, D Sandner
Purpose In vitreomacular traction (VMT), there is abnormal adhesion between the vitreous cortex and the retina, especially in the fovea. Symptoms of VMT include metamorphopsia and a decrease in visual acuity. Since 2013, ocriplasmin (Jetrea®) has been approved for treatment of symptomatic vitreomacular traction with or without macular holes (≤ 400 µm). Methods We retrospectively examined twenty-three eyes of twenty-one patients who underwent intravitreal ocriplasmin treatment for symptomatic vitreomacular traction with or without macular holes...
March 10, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28275601/acute-hemorrhagic-retinopathy-following-intravitreal-melphalan-injection-for-retinoblastoma-a-report-of-two-cases-and-technical-modifications-to-enhance-the-prevention-of-retinal-toxicity
#11
Hassan A Aziz, Jonathan W Kim, Francis L Munier, Jesse L Berry
AIMS: To report the occurrence of acute hemorrhagic retinopathy following intravitreal melphalan injection for retinoblastoma. METHODS: This is a retrospective case series of 2 patients with retinoblastoma treated with intravitreal melphalan for vitreous seeding who developed acute hemorrhagic retinopathy. RESULTS: Patient 1 is a 6-month-old female with bilateral retinoblastoma (Group D right eye and Group B left eye) treated with 4 cycles of systemic chemotherapy and 2 intravitreal melphalan injections in each eye...
January 2017: Ocular Oncology and Pathology
https://www.readbyqxmd.com/read/28271611/nlrp3-inflammasome-activation-is-associated-with-proliferative-diabetic-retinopathy
#12
Sirpa Loukovaara, Niina Piippo, Kati Kinnunen, Maria Hytti, Kai Kaarniranta, Anu Kauppinen
PURPOSE: Innate immunity and dysregulation of inflammatory processes play a role in vascular diseases like atherosclerosis or diabetes. Nucleotide-binding domain and Leucine-rich repeat Receptor containing a Pyrin domain 3 (NLRP3) inflammasomes are pro-inflammatory signalling complexes that were found in 2002. In addition to pathogens and other extracellular threats, they can be activated by various endogenous danger signals. The purpose of this study was to find out whether NLRP3 activation occurs in patients with sight-threatening forms of diabetic retinopathy (DR)...
March 8, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28271607/dissecting-microrna-dysregulation-in-age-related-macular-degeneration-new-targets-for-eye-gene-therapy
#13
REVIEW
Anne Louise Askou, Sidsel Alsing, Andreas Holmgaard, Toke Bek, Thomas J Corydon
MicroRNAs (miRNAs) are key regulators of gene expression in humans. Overexpression or depletion of individual miRNAs is associated with human disease. Current knowledge suggests that the retina is influenced by miRNAs and that dysregulation of miRNAs as well as alterations in components of the miRNA biogenesis machinery are involved in retinal diseases, including age-related macular degeneration (AMD). Furthermore, recent studies have indicated that the vitreous has a specific panel of circulating miRNAs and that this panel varies according to the specific pathological stress experienced by the retinal cells...
March 7, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28258574/aquaporins-in-the-eye
#14
Thuy Linh Tran, Steffen Hamann, Steffen Heegaard
The major part of the eye consists of water . Continuous movement of water and ions between the ocular compartments and to the systemic circulation is pivotal for many physiological functions in the eye. The movement of water facilitates removal of the many metabolic products of corneal-, ciliary body-, lens- and retinal metabolism, while maintaining transparency in the optical compartments. Transport across the corneal epithelium and endothelium maintains the corneal transparency. Also, aqueous humour is continuously secreted by the epithelia of the ciliary body and maintains the intraocular pressure...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28253402/the-relationship-between-the-renin-angiotensin-aldosterone-system-and-nmda-receptor-mediated-signal-and-the-prevention-of-retinal-ganglion-cell-death
#15
Mamoru Kobayashi, Kazuyuki Hirooka, Aoi Ono, Yuki Nakano, Akira Nishiyama, Akitaka Tsujikawa
Purpose: Excitotoxicity, which is due to glutamate-induced toxic effects on the retinal ganglion cell (RGC), is one of several mechanisms of RGC loss. The renin-angiotensin-aldosterone system (RAAS) has also been implicated in RGC death. Therefore, it is important to determine the exact relationship between the RAAS and N-methyl-d-aspartate (NMDA) receptor-mediated signal in order to prevent RGC death. Methods: N-methyl-d-aspartate or aldosterone was injected into the vitreous body...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28248989/efficacy-of-two-different-thiol-modified-crosslinked-hyaluronate-formulations-as-vitreous-replacement-compared-to-silicone-oil-in-a-model-of-retinal-detachment
#16
Sven Schnichels, Nele Schneider, Christine Hohenadl, José Hurst, Andreas Schatz, Kai Januschowski, Martin S Spitzer
The efficacy of two novel artificial vitreous body substitutes (VBS) consisting of highly biocompatible thiolated cross-linked hyaluronic acid (HA)-based hydrogels in comparison to silicone oil in a model of retinal detachment was investigated. Pars plana vitrectomy (23G) was performed in the right eye of 24 pigmented rabbits. Retinal detachment of two quadrants was induced by creating a small retinotomy near the vascular arcade and injecting balanced salt solution (BSS) subretinally. The retina was reattached by injecting air, which was followed by increasing the infusion pressure, and the retinal tear was treated by endolaser photocoagulation...
2017: PloS One
https://www.readbyqxmd.com/read/28247609/-hereditary-vitreous-degeneration-muddy-report-of-ten-cases
#17
Zhixin Shen, Enfang Gao, Wenqing Weng, Weiling Luo
Hereditary vitreous degeneration muddy is rare in clinic. Here we report ten cases (thirteen eyes) of hereditary vitreous degeneration muddy from two families. All patients presented with vitreous opacity, and the textures appeared tough and tensile. Two cases had concurrent detachment of rhegmatogenous retina. HE staining showed red changeableness, and methyl violet staining appeared purple. All patients received vitrectomy with traditional Chinese medicine treatment, and got satisfactory efficacy.
May 25, 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/28241308/apolipoprotein-e2-and-e3-but-not-e4-promote-retinal-pathologic-neovascularization
#18
Tomomi Masuda, Masamitsu Shimazawa, Yuhei Hashimoto, Atsushi Kojima, Shinsuke Nakamura, Shinsuke Suemori, Kiyofumi Mochizuki, Hideaki Kawakami, Kazuhide Kawase, Hideaki Hara
Purpose: To determine the relationship between the different isoforms of apolipoprotein E (ApoE) and retinal neovascularization. Methods: The concentrations of ApoE and VEGF in vitreous humor samples with either a macular hole (MH), or diabetic macular edema (DME), or proliferative diabetic retinopathy (PDR) with or without intravitreal injection of bevacizumab (IVB) were measured by ELISA. The effects of each isoform of ApoE on human retinal microvascular endothelial cells (HRMECs) in culture or on the retina of oxygen-induced retinopathy (OIR) mice were investigated...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28238753/glucocorticoid-induced-leucine-zipper-overexpression-inhibits-lipopolysaccharide-induced-retinal-inflammation-in-rats
#19
Ruiping Gu, Boya Lei, Qinmeng Shu, Gang Li, Gezhi Xu
Glucocorticoid-induced leucine zipper (GILZ) mediates several effects of glucocorticoids and has important anti-inflammatory properties. Here, we explored the role of GILZ in inhibiting retinal inflammation. Endotoxin-induced uveitis (EIU) was established in rats by intravitreal injection of lipopolysaccharide (LPS). GILZ levels decreased in the EIU retina at 4 h after LPS injection and slowly recovered within 24 h. Retinal GILZ was downregulated by recombinant lentivirus-delivered short-hairpin RNA targeting GILZ (shRNA-GILZ-rLV) and upregulated by recombinant lentivirus-mediated GILZ overexpression (Oe-GILZ-rLV)...
February 24, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28238097/igf-1-mediated-survival-from-induced-death-of-human-primary-cultured-retinal-pigment-epithelial-cells-is-mediated-by-an-akt-dependent-signaling-pathway
#20
Wenhua Zheng, Qian Meng, Haitao Wang, Fengxia Yan, Peter J Little, Xinguo Deng, Shaofen Lin
Degeneration of the human retinal pigmented epithelium (hRPE) is involved in several eye disorders such as age-related macular degeneration (AMD). In this study, we investigated the protective effect of IGF-1 on human primary cultured RPE cells and its underlying mechanism. IGF-1 dose- and time-dependently promoted the survival of RPE cells from serum deprivation. Western blot showed that IGF-1 stimulated the activation of the PI3K/Akt and MAPK pathways in hRPE. Inhibition of the PI3K/Akt pathway by the PI3K-specific inhibitor, LY294002 or inhibition of Akt by Akt-specific inhibitors Akt inhibitor VIII or SN-38, or downregulation Akt with siRNA specific for Akt blocked the effect of IGF-1 on hRPE...
February 25, 2017: Molecular Neurobiology
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