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Macular pigment

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https://www.readbyqxmd.com/read/28209587/genome-surgery-using-cas9-ribonucleoproteins-for-the-treatment-of-age-related-macular-degeneration
#1
Kyoungmi Kim, Sung Wook Park, Jin Hyoung Kim, Seung Hwan Lee, Daesik Kim, Taeyoung Koo, Kwang-Eun Kim, Jeong Hun Kim, Jin-Soo Kim
RNA-guided genome surgery using CRISPR-Cas9 nucleases has shown promise for the treatment of diverse genetic diseases. Yet, the potential of such nucleases for therapeutic applications in nongenetic diseases is largely unexplored. Here, we focus on age-related macular degeneration (AMD), a leading cause of blindness in adults, which is associated with retinal overexpression of, rather than mutations in, the VEGFA gene. Subretinal injection of preassembled, Vegfa gene-specific Cas9 ribonucleoproteins (RNPs) into the adult mouse eye gave rise to mutagenesis at the target site in the retinal pigment epithelium...
February 16, 2017: Genome Research
https://www.readbyqxmd.com/read/28205530/retinal-structure-and-function-in-eyes-with-optic-nerve-hypoplasia
#2
Satoshi Katagiri, Sachiko Nishina, Tadashi Yokoi, Masashi Mikami, Yuri Nakayama, Michiko Tanaka, Noriyuki Azuma
We investigated retinal structure and function in eyes with optic nerve hypoplasia (ONH). Twenty-nine eyes of 18 patients with ONH and 21 eyes of 21 control patients were analyzed. Spectral-domain optical coherence tomography (SD-OCT), full-field electroretinography (FF-ERG), and focal macular ERG (FM-ERG) were performed. SD-OCT analysis of the macular region showed significant ganglion cells complex (GCC) thinning nasally and temporally (P < 0.05), but the thickness from the inner nuclear layer (INL) to the retinal pigment epithelium (RPE) became thinner only nasally (P < 0...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202390/systemic-injection-of-rpe65-programmed-bone-marrow-derived-cells-prevents-progression-of-chronic-retinal-degeneration
#3
Xiaoping Qi, S Louise Pay, Yuanqing Yan, James Thomas, Alfred S Lewin, Lung-Ji Chang, Maria B Grant, Michael E Boulton
Bone marrow stem and progenitor cells can differentiate into a range of non-hematopoietic cell types, including retinal pigment epithelium (RPE)-like cells. In this study, we programmed bone marrow-derived cells (BMDCs) ex vivo by inserting a stable RPE65 transgene using a lentiviral vector. We tested the efficacy of systemically administered RPE65-programmed BMDCs to prevent visual loss in the superoxide dismutase 2 knockdown (Sod2 KD) mouse model of age-related macular degeneration. Here, we present evidence that these RPE65-programmed BMDCs are recruited to the subretinal space, where they repopulate the RPE layer, preserve the photoreceptor layer, retain the thickness of the neural retina, reduce lipofuscin granule formation, and suppress microgliosis...
February 12, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28198205/supplementation-with-macular-carotenoids-reduces-psychological-stress-serum-cortisol-and-sub-optimal-symptoms-of-physical-and-emotional-health-in-young-adults
#4
Nicole Tressa Stringham, Philip V Holmes, James M Stringham
PURPOSE: Oxidative stress and systemic inflammation are the root cause of several deleterious effects of chronic psychological stress. We hypothesize that the antioxidant and anti-inflammatory capabilities of the macular carotenoids (MCs) lutein, zeaxanthin, and meso-zeaxanthin could, via daily supplementation, provide a dietary means of benefit. METHODS: A total of 59 young healthy subjects participated in a 12-month, double-blind, placebo-controlled trial to evaluate the effects of MC supplementation on blood cortisol, psychological stress ratings, behavioural measures of mood, and symptoms of sub-optimal health...
February 15, 2017: Nutritional Neuroscience
https://www.readbyqxmd.com/read/28195614/omega-sign-a-distinct-optical-coherence-tomography-finding-in-macular-combined-hamartoma-of-retina-and-retinal-pigment-epithelium
#5
Vinod Kumar, Rohan Chawla, Koushik Tripathy
BACKGROUND AND OBJECTIVE: To report a distinct optical coherence tomography (OCT) appearance of macular combined hamartoma of retina and retinal pigment epithelium (CHRRPE). PATIENTS AND METHODS: This is a retrospective case series of four eyes of four patients with macular CHRRPE who were assessed with the help of color fundus photographs, swept-source OCT (SS-OCT), and fundus fluorescein angiography wherever required. RESULTS: All four patients presented with decreased visual acuity...
February 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28194256/retinal-diseases-associated-with-oxidative-stress-and-the-effects-of-a-free-radical-scavenger-edaravone
#6
REVIEW
Tomomi Masuda, Masamitsu Shimazawa, Hideaki Hara
Oxidative stress plays a pivotal role in developing and accelerating retinal diseases including age-related macular degeneration (AMD), glaucoma, diabetic retinopathy (DR), and retinal vein occlusion (RVO). An excess amount of reactive oxygen species (ROS) can lead to functional and morphological impairments in retinal pigment epithelium (RPE), endothelial cells, and retinal ganglion cells (RGCs). Here we demonstrate that edaravone, a free radical scavenger, decreased apoptotic cell death, oxidative damage to DNA and lipids, and angiogenesis through inhibiting JNK and p38 MAPK pathways in AMD, glaucoma, DR, and RVO animal models...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28191760/directing-differentiation-of-pluripotent-stem-cells-toward-retinal-pigment-epithelium-lineage
#7
Parul Choudhary, Heather Booth, Alex Gutteridge, Beata Surmacz, Irene Louca, Juliette Steer, Julie Kerby, Paul John Whiting
Development of efficient and reproducible conditions for directed differentiation of pluripotent stem cells into specific cell types is important not only to understand early human development but also to enable more practical applications, such as in vitro disease modeling, drug discovery, and cell therapies. The differentiation of stem cells to retinal pigment epithelium (RPE) in particular holds promise as a source of cells for therapeutic replacement in age-related macular degeneration. Here we show development of an efficient method for deriving homogeneous RPE populations in a period of 45 days using an adherent, monolayer system and defined xeno-free media and matrices...
February 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28187978/optical-coherence-tomography-examination-of-the-retinal-pigment-epithelium-in-best-vitelliform-macular-dystrophy
#8
Cynthia X Qian, Dionisio Charran, Cameron R Strong, Timothy J Steffens, Thiran Jayasundera, John R Heckenlively
PURPOSE: To describe the anatomic changes and natural history of vitelliform lesions in Best vitelliform macular dystrophy (BVMD) using spectral-domain optical coherence tomography (OCT). DESIGN: Prospective comparative case series. PARTICIPANTS: Twenty patients (40 eyes) with molecular confirmation of mutation in the BEST1 gene and 20 age-matched controls were included. METHODS: Color fundus photographs, fundus autofluorescence, and spectral-domain OCT were obtained, and these findings were compared between the 2 groups...
February 7, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28186866/toward-postgenomics-ophthalmology-a-proteomic-map-of-the-human-choroid-retinal-pigment-epithelium-tissue
#9
Manjunath Dammalli, Krishna R Murthy, Sneha M Pinto, Kalpana Babu Murthy, Raja Sekhar Nirujogi, Anil K Madugundu, Gourav Dey, Bipin Nair, Harsha Gowda, Thottethodi Subrahmanya Keshava Prasad
Ophthalmology and visual health research have received relatively limited attention from the personalized medicine community, but this trend is rapidly changing. Postgenomics technologies such as proteomics are being utilized to establish a baseline biological variation map of the human eye and related tissues. In this context, the choroid is the vascular layer situated between the outer sclera and the inner retina. The choroidal circulation serves the photoreceptors and retinal pigment epithelium (RPE). The RPE is a layer of cuboidal epithelial cells adjacent to the neurosensory retina and maintains the outer limit of the blood-retina barrier...
February 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28186459/bioactivity-of-carotenoids-chasms-of-knowledge
#10
Torsten Bohn
Carotenoid dietary intake, especially within fruits/vegetables and their plasma levels have been associated in many epidemiological studies with a reduced risk of several chronic diseases, including type-2 diabetes, cardiovascular diseases, several types of cancer, and agerelated macular degeneration. However, intervention trials with isolated carotenoids (as supplements) have fallen short of fulfi lling the hopes that were placed in these lipophilic pigments, often producing no positive or even adverse effects, such as increased lung cancer rate or total mortality...
February 10, 2017: International Journal for Vitamin and Nutrition Research. Journal International de Vitaminologie et de Nutrition
https://www.readbyqxmd.com/read/28186209/gene-transfer-of-prolyl-hydroxylase-domain-2-inhibits-hypoxia-inducible-angiogenesis-in-a-model-of-choroidal-neovascularization
#11
Anna Takei, Malena Ekström, Parviz Mammadzada, Monica Aronsson, Ma Yu, Anders Kvanta, Helder André
Cellular responses to hypoxia are mediated by the hypoxia-inducible factors (HIF). In normoxia, HIF-α proteins are regulated by a family of dioxygenases, through prolyl and asparagyl hydroxylation, culminating in proteasomal degradation and transcriptional inactivation. In hypoxia, the dioxygenases become inactive and allow formation of HIF transcription factor, responsible for upregulation of hypoxia genes. In ocular neoangiogenic diseases, such as neovascular age-related macular degeneration (nAMD), hypoxia seems pivotal...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28183612/controlled-surface-morphology-and-hydrophilicity-of-polycaprolactone-toward-human-retinal-pigment-epithelium-cells
#12
Saleheh Shahmoradi, Fatemeh Yazdian, Fatemeh Tabandeh, Zahra-Soheila Soheili, Ashraf Sadat Hatamian Zarami, Mona Navaei-Nigjeh
Applying scaffolds as a bed to enhance cell proliferation and even differentiation is one of the treatment of retina diseases such as age-related macular degeneration (AMD) which deteriorating photoreceptors and finally happening blindness. In this study, aligned polycaprolactone (PCL) nanofibers were electrospun and at different conditions and their characteristics were measured by scanning electron microscope (SEM) and contact angle. Response surface methodology (RSM) was used to optimize the diameter of fabricated nanofibers...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28180033/platform-independent-cirrus-and-spectralis-thickness-measurements-in-eyes-with-diabetic-macular-edema-using-fully-automated-software
#13
Alex S Willoughby, Stephanie J Chiu, Rachel K Silverman, Sina Farsiu, Clare Bailey, Henry E Wiley, Frederick L Ferris, Glenn J Jaffe
PURPOSE: We determine whether the automated segmentation software, Duke Optical Coherence Tomography Retinal Analysis Program (DOCTRAP), can measure, in a platform-independent manner, retinal thickness on Cirrus and Spectralis spectral domain optical coherence tomography (SD-OCT) images in eyes with diabetic macular edema (DME) under treatment in a clinical trial. METHODS: Automatic segmentation software was used to segment the internal limiting membrane (ILM), inner retinal pigment epithelium (RPE), and Bruch's membrane (BM) in SD-OCT images acquired by Cirrus and Spectralis commercial systems, from the same eye, on the same day during a clinical interventional DME trial...
February 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28171859/comparison-of-55%C3%A2-wide-field-spectral-domain-optical-coherence-tomography-and-conventional-30%C3%A2-optical-coherence-tomography-for-the-assessment-of-diabetic-macular-edema
#14
Marion R Munk, Joel Lincke, Helena Giannakaki-Zimmermann, Andreas Ebneter, Sebastian Wolf, Martin S Zinkernagel
PURPOSE: To compare conventional 30° spectral domain optical coherence tomography (SD-OCT) with 55° wide-field SD-OCT for the assessment of diabetic macular edema (DME). METHODS: This study included 50 DME patients. Both 55° and 30° SD-OCT was conducted. Two readers evaluated scans according to a standardized grading protocol. Intergrader agreement as well as agreement between 30° and 55° SD-OCT were assessed. RESULTS: Intergrader agreement (κ) was strong and ranged from 0...
February 8, 2017: Ophthalmologica. Journal International D'ophtalmologie
https://www.readbyqxmd.com/read/28169876/association-of-drusen-volume-with-choroidal-parameters-in-nonneovascular-age-related-macular-degeneration
#15
Siva Balasubramanian, Jianqin Lei, Muneeswar G Nittala, Swetha B Velaga, Jonathan Haines, Margaret A Pericak-Vance, Dwight Stambolian, SriniVas R Sadda
PURPOSE: The choroid is thought to be relevant to the pathogenesis of nonneovascular age-related macular degeneration, but its role has not yet been fully defined. In this study, we evaluate the relationship between the extent of macular drusen and specific choroidal parameters, including thickness and intensity. METHODS: Spectral domain optical coherence tomography images were collected from two distinct, independent cohorts with nonneovascular age-related macular degeneration: Amish (53 eyes of 34 subjects) and non-Amish (40 eyes from 26 subjects)...
February 6, 2017: Retina
https://www.readbyqxmd.com/read/28169283/ultra-high-resolution-profiles-of-macular-intra-retinal-layer-thicknesses-and-associations-with-visual-field-defects-in-primary-open-angle-glaucoma
#16
Qi Chen, Shenghai Huang, Qingkai Ma, Huiling Lin, Mengmeng Pan, Xinting Liu, Fan Lu, Meixiao Shen
The structural characteristics of the outer retinal layers in primary open angle glaucoma (POAG) are still controversial, and these changes, along with those in the inner retinal layers, could have clinical and/or pathophysiological significance. A custom-built ultra-high resolution optical coherence tomography (UHR-OCT) combined with an automated segmentation algorithm can image and measure the eight intra-retinal layers. The purpose of this study is to determine the thickness characteristics of the macular intra-retinal layers, especially the outer layers, in POAG patients...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28166160/predictive-factors-for-development-of-neovascular-age-related-macular-degeneration-a-spectral-domain-optical-coherence-tomography-study
#17
Serena Fragiotta, Tommaso Rossi, Alessandro Cutini, Pier L Grenga, Enzo M Vingolo
PURPOSE: To investigate the risk factors predictive for the development of neovascular age-related macular degeneration (NVAMD) by means of spectral-domain optical coherence tomography. METHODS: Retrospective study of 73 eyes graded Stage 2 and Stage 3 according to the AMD International Grading System with minimum follow-up of 24 months. Drusenoid pigment epithelial detachment, hyperreflective foci, external limiting membrane, inner ellipsoid band, and retinal pigment epithelium integrity were analyzed at baseline and last follow-up...
February 3, 2017: Retina
https://www.readbyqxmd.com/read/28163347/biophysical-mechanism-of-transient-retinal-phototropism-in-rod-photoreceptors
#18
Xiaohui Zhao, Damber Thapa, Benquan Wang, Shaoyan Gai, Xincheng Yao
Oblique light stimulation evoked transient retinal phototropism (TRP) has been recently detected in frog and mouse retinas. High resolution microscopy of freshly isolated retinas indicated that the TRP is predominated by rod photoreceptors. Comparative confocal microscopy and optical coherence tomography (OCT) revealed that the TRP predominantly occurred from the photoreceptor outer segment (OS). However, biophysical mechanism of rod OS change is still unknown. In this study, frog retinal slices, which open a cross section of retinal photoreceptor and other functional layers, were used to test the effect of light stimulation on rod OS...
February 13, 2016: Proceedings of SPIE
https://www.readbyqxmd.com/read/28159556/activated-microglia-trigger-inflammasome-activation-and-lysosomal-destabilization-in-human-rpe-cells
#19
Christopher Nebel, Alexander Aslanidis, Khalid Rashid, Thomas Langmann
Activation of the innate immune system plays a major role in retinal degenerative diseases including age-related macular degeneration (AMD). In this study, we investigated whether reactive microglia trigger and sustain NLRP3 inflammasome activation in human retinal pigment epithelium (ARPE-19) cells. Specifically, we analyzed the potential of cell culture supernatants from lipopolysaccharide (LPS)-stimulated human microglia in combination with the lysosomal destabilization agent Leu-Leu-O-Me (LLOMe) to activate the inflammasome in ARPE-19 cells...
January 31, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28157165/stem-cell-therapies-in-retinal-disorders
#20
REVIEW
Aakriti Garg, Jin Yang, Winston Lee, Stephen H Tsang
Stem cell therapy has long been considered a promising mode of treatment for retinal conditions. While human embryonic stem cells (ESCs) have provided the precedent for regenerative medicine, the development of induced pluripotent stem cells (iPSCs) revolutionized this field. iPSCs allow for the development of many types of retinal cells, including those of the retinal pigment epithelium, photoreceptors, and ganglion cells, and can model polygenic diseases such as age-related macular degeneration. Cellular programming and reprogramming technology is especially useful in retinal diseases, as it allows for the study of living cells that have genetic variants that are specific to patients' diseases...
February 2, 2017: Cells
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