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https://www.readbyqxmd.com/read/29786089/spectral-analysis-of-fundus-autofluorescence-pattern-as-a-tool-to-detect-early-stages-of-degeneration-in-the-retina-and-retinal-pigment-epithelium
#1
Tatiana B Feldman, Marina A Yakovleva, Andrey V Larichev, Patimat M Arbukhanova, Alexandra Sh Radchenko, Sergey A Borzenok, Vladimir A Kuzmin, Mikhail A Ostrovsky
PURPOSE: The aim of this work is the determination of quantitative diagnostic criteria based on the spectral characteristics of fundus autofluorescence to detect early stages of degeneration in the retina and retinal pigment epithelium (RPE). METHODS: RPE cell suspension samples were obtained from the cadaver eyes with and without signs of age-related macular degeneration (AMD). Fluorescence analysis at an excitation wavelength of 488 nm was performed. The fluorescence lifetimes of lipofuscin-granule fluorophores were measured by counting time-correlated photon method...
May 22, 2018: Eye
https://www.readbyqxmd.com/read/29782699/endoplasmic-reticulum-targeted-fluorescent-nanodot-with-large-stokes-shift-for-vesicular-transport-monitoring-and-long-term-bioimaging
#2
Leilei Shi, Xihui Gao, Wangzhang Yuan, Li Xu, Hongping Deng, Chenwei Wu, Jiapei Yang, Xin Jin, Chuan Zhang, Xinyuan Zhu
Herein, a highly stable aggregation-induced emission (AIE) fluorescent nanodot assembled by an amphiphilic quinoxalinone derivative-peptide conjugate, namely Quino-1-Fmoc-RACR (also termed as Q1-PEP), which exhibits large Stokes shift and an endoplasmic reticulum (ER)-targeting capacity for bioimaging is reported. It is found that the resulting nanodot can effectively enter the ER with high fluorescent emission. As the ER is mainly involved in the transport of synthesized proteins in vesicles to the Golgi or lysosomes, the Q1-PEP nanodot with ER-targeting capacity can be used to monitor vesicular transport inside the cells...
May 21, 2018: Small
https://www.readbyqxmd.com/read/29781975/novel-best1-mutations-detected-by-next-generation-sequencing-in-a-chinese-population-with-vitelliform-macular-dystrophy
#3
Jingli Guo, Fengjuan Gao, Wenyi Tang, Yuhe Qi, Yi Xuan, Wei Liu, Lei Li, Xiaofeng Ye, Gezhi Xu, Jihong Wu, Yongjin Zhang
PURPOSE: To characterize novel BEST1 mutations and the phenotype-genotype correlations in vitelliform macular dystrophy in a Chinese population. METHODS: Seventeen individuals affected by vitelliform macular dystrophy underwent detailed ophthalmic examinations, including a best-corrected visual acuity test, slit-lamp biomicroscopy, fundus photography, spectral-domain optical coherence tomography, fundus autofluorescence, fluorescein angiography, and optical coherence tomography angiography...
May 16, 2018: Retina
https://www.readbyqxmd.com/read/29781974/prognostic-value-of-shape-descriptive-factors-for-the-progression-of-geographic-atrophy-secondary-to-age-related-macular-degeneration
#4
Maximilian Pfau, Moritz Lindner, Lukas Goerdt, Sarah Thiele, Jennifer Nadal, Matthias Schmid, Steffen Schmitz-Valckenberg, SriniVas R Sadda, Frank G Holz, Monika Fleckenstein
PURPOSE: To systematically compare the prognostic value of multiple shape-descriptive factors in the natural course of the disease. METHODS: A total of 296 eyes of 201 patients (female patients 130; mean age: 72.2 ± 13.08 years) with a median follow-up of 2.38 years from 2 prospective, noninterventional natural history studies (Fundus-Autofluorescence-in-Age-related-Macular-Degeneration [clinicaltrials.gov identifier NCT00393692], Directional-Spread-in-Geographic-Atrophy [NCT02051998]) were included in the analysis...
May 16, 2018: Retina
https://www.readbyqxmd.com/read/29780930/morpho-functional-evaluation-of-torpedo-maculopathy-with-optical-coherence-tomography-angiography-and-microperimetry
#5
Gabriela Grimaldi, Andrea Scupola, Maria G Sammarco, Michele Marullo, Maria A Blasi
Purpose: To report the case of a 13-year-old girl with torpedo maculopathy, evaluated with multimodal morpho-functional retinal imaging, including fundus photography, infra-red and blue fundus autofluorescence, swept-source optical coherence tomography (OCT), en face OCT, OCT angiography and microperimetry (MP). Observations: On fundus examination, a torpedo-like hypopigmented lesion was observed temporal to the fovea in the left eye. OCT showed disruption of outer retinal layers and the presence of a subretinal cleft...
June 2018: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29780921/is-it-melanoma-associated-retinopathy-or-drug-toxicity-bilateral-cystoid-macular-edema-posing-a-diagnostic-and-therapeutic-dilemma
#6
Sachi R Patel, Stavros N Moysidis, Nicole Koulisis, Philip P Storey, Amir H Kashani, Narsing A Rao, Damien C Rodger
Purpose: To report the clinical presentation, multimodal imaging, and management of a patient with metastatic melanoma who presented with cystoid macular edema (CME). Observations: We report a case of a 71-year-old Caucasian male with metastatic melanoma who presented with bilateral cystoid macular edema after being on treatment with a programmed T cell death ligand 1 inhibitor, MPDL3280, for 1 year. Multimodal imaging techniques, including color fundus photographs, autofluorescence, spectral domain optical coherence tomography (OCT), fluorescein angiography (Spectralis, Heidelberg, Germany), and spectral-domain OCT angiography (Zeiss; California, USA) were performed to evaluate the etiology of his CME and to monitor his response to treatment...
June 2018: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29780506/highly-luminescent-biocompatible-ytterbium-iii-complexes-as-near-infrared-fluorophores-for-living-cell-imaging
#7
Yingying Ning, Juan Tang, Yi-Wei Liu, Jing Jing, Yuansheng Sun, Jun-Long Zhang
Herein, we report the design and synthesis of biocompatible Yb3+ complexes for near-infrared (NIR) living cell imaging. Upon excitation at either the visible (Soret band) or red region (Q band), these β-fluorinated Yb3+ complexes display high NIR luminescence (quantum yields up to 23% and 13% in dimethyl sulfoxide and water, respectively) and have higher stabilities and prolonged decay lifetimes (up to 249 μs) compared to the β-non-fluorinated counterparts. This renders the β-fluorinated Yb3+ complexes as a new class of biological optical probes in both steady-state imaging and time-resolved fluorescence lifetime imaging (FLIM)...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29774665/skin-autofluorescence-a-non-invasive-biomarker-for-advanced-glycation-end-products-is-not-related-to-the-number-of-pregnancies
#8
Robert P Van Waateringe, Laura Truyens, Paul P van den Berg, Helen L Lutgers, Bruce H R Wolffenbuttel
No abstract text is available yet for this article.
May 17, 2018: Journal of Diabetes
https://www.readbyqxmd.com/read/29772060/nucleocytoplasmic-shuttling-the-ins-and-outs-of-quantitative-imaging
#9
Chris Molenaar, Kate L Weeks
Nucleocytoplasmic protein shuttling is integral to the transmission of signals between the nucleus and the cytoplasm. The nuclear/cytoplasmic distribution of proteins of interest can be determined via fluorescence microscopy, following labelling of the target protein with fluorophore-conjugated antibodies (immunofluorescence) or by tagging the target protein with an autofluorescent protein, such as green fluorescent protein (GFP). The latter enables live cell imaging, a powerful approach that precludes many of the artefacts associated with indirect immunofluorescence in fixed cells...
May 17, 2018: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29772051/optical-coherence-tomography-angiography-of-pigmented-paravenous-retinochoroidal-atrophy
#10
Maria Vittoria Cicinelli, Chiara Giuffrè, Alessandro Rabiolo, Maurizio Battaglia Parodi, Francesco Bandello
A 58-year-old man with bilateral pigmented paravenous retinochoroidal atrophy (PPRCA) associated with macular coloboma in the right eye underwent color fundus photography and fundus autofluorescence with the California ultra-widefield retinal imaging system (Optos, Dunfermline, UK), spectral-domain optical coherence tomography (SD-OCT) (Heidelberg Spectralis HRA + OCT; Heidelberg Engineering, Heidelberg, Germany), and en face OCT angiography (OCTA) (AngioPlex, Cirrus HD-OCT 5000; Carl Zeiss Meditec, Dublin, CA)...
May 1, 2018: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29772013/rapid-differentiation-of-epithelial-cell-types-in-aged-biological-samples-using-autofluorescence-and-morphological-signatures
#11
Emily R Brocato, M Katherine Philpott, Catherine C Connon, Christopher J Ehrhardt
Establishing the tissue source of epithelial cells within a biological sample is an important capability for forensic laboratories. In this study we used Imaging Flow Cytometry (IFC) to analyze individual cells recovered from buccal, epidermal, and vaginal samples that had been dried between 24 hours and more than eight weeks. Measurements capturing the size, shape, and fluorescent properties of cells were collected in an automated manner and then used to build a multivariate statistical framework for differentiating cells based on tissue type...
2018: PloS One
https://www.readbyqxmd.com/read/29770905/congenital-grouped-albinotic-spots-of-the-retinal-pigment-epithelium-in-a-patient-with-hemihypertrophy-and-caf%C3%A3-au-lait-spots
#12
Eugenia C White, Jesse D Sengillo, Galaxy Y Cho, Mathieu F Bakhoum, Stephen H Tsang
PURPOSE: To describe the finding of circularly grouped hypomelanotic spots in the central macula of a patient with syndromic characteristics. METHODS: Case report of a patient with albinotic spots grouped within the macula, café au lait spots, and left-sided hemihypertrophy. RESULTS: A 15-year-old boy presented with hypomelanotic spots which were hyperautofluorescent on fundus autofluorescence imaging with no disruption of the retinal laminae or photoreceptor inner and outer segment (IS/OS) junction on spectral domain optical coherence tomography...
May 16, 2018: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/29770904/deferoxamine-induced-electronegative-erg-responses
#13
Ruben Jauregui, Karen Sophia Park, Alexander G Bassuk, Vinit B Mahajan, Stephen H Tsang
PURPOSE: To report a case of deferoxamine-induced retinopathy characterized by electroretinography (ERG), optical coherence tomography angiography (OCT-A), and other multimodal imaging. METHODS: This is an observational case report of one patient. Full-field ERG was performed. OCT-A, spectral-domain optical coherence tomography (SD-OCT), color fundus photography, and fundus autofluorescence were used to characterize the retinopathy induced by deferoxamine use. RESULTS: A 64-year-old man with a history of β-thalassemia intermedia presented with worsening visual acuity, nyctalopia, and electronegative ERG...
May 16, 2018: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/29765194/somatotype-the-risk-of-hydroxychloroquine-retinopathy-and-safe-daily-dosing-guidelines
#14
David J Browning, Chong Lee
Purpose: The aim of this study was to determine whether somatotype influences the risk of hydroxychloroquine (HC) retinopathy (HCR) and whether dosing by real body weight (RBW), ideal body weight (IBW), or the lesser of these better predicts the risk of HCR. Patients and methods: A total of 565 patients taking HC for whom height and weight were recorded and a sensitive ancillary testing modality was used including 10-2 visual fields, spectral domain optical coherence tomography, fundus autofluorescence imaging, and multifocal electroretinography were enrolled...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29763612/topographic-correspondence-of-macular-atrophy-with-choroidal-neovascularization-in-ranibizumab-treated-eyes-of-the-trex-amd-trial
#15
Nizar Saleh Abdelfattah, Amirhossein Hariri, Mayss Al-Sheikh, Sean Pitetta, Adel Ebraheem, Charles C Wykoff, SriniVas R Sadda
PURPOSE: To quantify the extent of topographic correspondence between baseline (BSL) CNV and macular atrophy (MA) at follow-up in eyes with NVAMD. DESIGN: Post hoc analysis of randomized, controlled clinical trial data. METHODS: Sixty treatment-naïve neovascular age-related macular degeneration (NVAMD) patients from TREX-AMD trial were followed for 18-months. Regions of month-18 macular atrophy (MA) were graded on fundus autofluorescence (FAF) with guidance of spectral domain optical coherence tomography (SD-OCT)...
May 12, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29760987/5-ala-fluorescence-and-laser-doppler-flowmetry-for-guidance-in-a-stereotactic-brain-tumor-biopsy
#16
Neda Haj-Hosseini, Johan C O Richter, Peter Milos, Martin Hallbeck, Karin Wårdell
A fiber optic probe was developed for guidance during stereotactic brain biopsy procedures to target tumor tissue and reduce the risk of hemorrhage. The probe was connected to a setup for the measurement of 5-aminolevulinic acid (5-ALA) induced fluorescence and microvascular blood flow. Along three stereotactic trajectories, fluorescence (n = 109) and laser Doppler flowmetry (LDF) (n = 144) measurements were done in millimeter increments. The recorded signals were compared to histopathology and radiology images...
May 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29760980/optimization-of-wavelength-selection-for-multispectral-image-acquisition-a-case-study-of-atrial-ablation-lesions
#17
Huda Asfour, Shuyue Guan, Narine Muselimyan, Luther Swift, Murray Loew, Narine Sarvazyan
In vivo autofluorescence hyperspectral imaging of moving objects can be challenging due to motion artifacts and to the limited amount of acquired photons. To address both limitations, we selectively reduced the number of spectral bands while maintaining accurate target identification. Several downsampling approaches were applied to data obtained from the atrial tissue of adult pigs with sites of radiofrequency ablation lesions. Standard image qualifiers such as the mean square error, the peak signal-to-noise ratio, the structural similarity index map, and an accuracy index of lesion component images were used to quantify the effects of spectral binning, an increased spectral distance between individual bands, as well as random combinations of spectral bands...
May 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29760976/glioblastoma-cells-labeled-by-robust-raman-tags-for-enhancing-imaging-contrast
#18
Li-Ching Huang, Yung-Ching Chang, Yi-Syuan Wu, Wei-Lun Sun, Chan-Chuan Liu, Chun-I Sze, Shiuan-Yeh Chen
Complete removal of a glioblastoma multiforme (GBM), a highly malignant brain tumor, is challenging due to its infiltrative characteristics. Therefore, utilizing imaging agents such as fluorophores to increase the contrast between GBM and normal cells can help neurosurgeons to locate residual cancer cells during image guided surgery. In this work, Raman tag based labeling and imaging for GBM cells in vitro is described and evaluated. The cell membrane of a GBM adsorbs a substantial amount of functionalized Raman tags through overexpression of the epidermal growth factor receptor (EGFR) and "broadcasts" stronger pre-defined Raman signals than normal cells...
May 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29759239/single-hole-hollow-molecularly-imprinted-polymer-embedded-carbon-dot-for-fast-detection-of-tetracycline-in-honey
#19
Huiyu Li, Li Zhao, Yuan Xu, Tianyu Zhou, Haochi Liu, Ning Huang, Jie Ding, Yi Li, Lan Ding
It is difficult to detect tetracycline (TC) in honey sample by using carbon dots (CDs) because the autofluorescence of the matrix of honey sample overlaps with the fluorescence emission spectrum of the large majority of CDs. Herein, single-hole hollow molecularly imprinted polymers embedded carbon dots (HMIP@CD) was prepared via microwave-assisted method. TC in diluted honey sample was adsorbed by the HMIP@CD within 3 min, after which the HMIP@CD absorbed with TC was separated by centrifugation from honey sample and redispersed into phosphate buffer solution...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29757612/autofluorescence-free-immunoassay-using-x-ray-scintillating-nanotags
#20
Xiang-Yu Ou, Tao Guo, Liang Song, Han-Yu Liang, Qi-Zhao Zhang, Jia-Qi Liao, Jing-Ying Li, Juan Li, Huang-Hao Yang
Auto-fluorescence background in complex biological samples is a major challenge in achieving high sensitivity of fluorescence immunoassays (FIA). Here we report an X-ray luminescence-based immunoassay for high-sensitivity detection of biomarkers using X-ray scintillating nanotags. Due to the weak scattering and absorption of most biological chromophores by X-ray excitation, a low-dose X-ray source can be used to produce intense scintillating luminescence from the nanotags for autofluorescence-free biosensing...
May 14, 2018: Analytical Chemistry
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