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Corneal endothelium

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https://www.readbyqxmd.com/read/28319106/a-systematic-review-on-the-impact-of-diabetes-mellitus-on-the-ocular-surface
#1
REVIEW
K Co Shih, K S-L Lam, L Tong
Diabetes mellitus is associated with extensive morbidity and mortality in any human community. It is well understood that the burden of diabetes is attributed to chronic progressive damage in major end-organs, but it is underappreciated that the most superficial and transparent organ affected by diabetes is the cornea. Different corneal components (epithelium, nerves, immune cells and endothelium) underpin specific systemic complications of diabetes. Just as diabetic retinopathy is a marker of more generalized microvascular disease, corneal nerve changes can predict peripheral and autonomic neuropathy, providing a window of opportunity for early treatment...
March 20, 2017: Nutrition & Diabetes
https://www.readbyqxmd.com/read/28317684/comparison-of-the-performance-and-safety-of-2-ophthalmic-viscosurgical-devices-in-cataract-surgery
#2
Gerd U Auffarth, Florian N Auerbach, Tanja Rabsilber, José A Gegúndez, Ricardo Cuiña, Yves Renard, Paolo Vinciguerra, Fabrizio Camesasca, Francoise Van Cauwenberge, Thierry Amzallag, Gysbert Van Setten, Mike P Holzer
PURPOSE: To compare the clinical performance and safety of 2 ophthalmic viscosurgical devices (OVDs)-Twinvisc (OVD 1) and Duovisc (OVD 2)-in cataract surgery. SETTING: European multicenter study. DESIGN: Prospective randomized controlled study. METHODS: Patients with cataract had phacoemulsification and intraocular lens implantation in 1 eye. They were randomly assigned to receive OVD 1 or OVD 2. Preoperative and postoperative examinations over 3 months included mean intraocular pressure (IOP), incidence of IOP peaks (≥30 mm Hg and ≥24 mm Hg), endothelial cell count (ECC), corneal thickness, and intraocular inflammation...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28298869/pigment-dispersion-syndrome-associated-with-spontaneous-subluxation-of-crystalline-lens
#3
Vikas Veerwal, Jawahar Lal Goyal, Parul Jain, Ritu Arora
Pigment dispersion syndrome (PDS) is an ocular condition characterized by a dispersion of iris pigment throughout the eye. This pigment is deposited in a characteristic manner on the corneal endothelium as Krukenberg's spindle, anterior surface of the iris, in the trabecular meshwork, on the lens and zonule and occasionally on the anterior hyaloid face. Even with deposition of pigment on zonular fibers, no zonular weakness, or zonular dehiscence has been reported in these cases. We report a unique case of PDS with bilateral spontaneous subluxation of crystalline lens...
January 2017: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/28280298/corneal-endothelium-and-central-corneal-thickness-changes-in-type-2-diabetes-mellitus
#4
Amira El-Agamy, Shams Alsubaie
PURPOSE: This study was conducted to compare the corneal endothelial cell density (ECD), morphological features, and central corneal thickness (CCT) in type 2 diabetes mellitus (DM) with age-matched, nondiabetic control subjects using EM-3000 Specular Microscope. STUDY DESIGN: This was a prospective, hospital-based, nonrandomized, case-control, observational, and quantitative study. SUBJECTS AND METHODS: The study included 57 patients (57 eyes) with type 2 DM and 45 control (nondiabetic) subjects (45 eyes)...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28273942/human-corneal-endothelial-cell-cultivation-from-old-donor-corneas-with-forced-attachment
#5
Mohit Parekh, Sajjad Ahmad, Alessandro Ruzza, Stefano Ferrari
Human corneal endothelial cells (HCEnCs) are responsible for maintaining the transparency of the cornea. Damaged or diseased HCEnCs may cause blindness. Replacement of the diseased cells with a healthy donor endothelium is the only currently available treatment. Tissue-engineering can serve as an alternative to conventional donor corneal transplantation. Due to the global shortage of donor corneas, a wide interest in the development of cultured graft substitutes and artificial corneas has increased. Availability of the old donor corneas is higher especially for research...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28268563/automated-morphometric-description-of-human-corneal-endothelium-from-in-vivo-specular-and-confocal-microscopy
#6
F Scarpa, A Ruggeri
Corneal images acquired by in-vivo specular and confocal microscopy provide clinical information on the cornea endothelium health state. Indeed, the normal hexagonal shape of endothelial cells is usually affected by age and pathologies. At present, the analysis is based on manual or semi-automatic methods and the segmentation of a large number of endothelial cells is required for a meaningful estimation of the clinical parameters. We propose an automated method that detects the centers of endothelial cells by convolving the original image with customized two-dimensional kernels, derives a structure made by connected vertices from the recognized centers using the Euclidean distance, and fine-tunes the derived structure through a genetic algorithm, which combines information about the typical regularity of endothelial cells shape with the pixels intensity of the actual image...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28259779/in-vivo-characteristics-of-corneal-endothelium-descemet-s-membrane-complex-for-the-diagnosis-of-corneal-graft-rejection
#7
Mohamed Abou Shousha, Sonia H Yoo, Mohamed S Sayed, Sean Edelstein, Matthew Council, Ravi S Shah, Joshua Abernathy, Zachary Schmitz, Patrick Stuart, Rocio Bentivegna, Maria P Fernandez, Christopher Smith, Xiaotang Yin, George J Harocopos, Sander R Dubovy, William J Feuer, Jianhua Wang, Victor L Perez
PURPOSE: To evaluate the utility of Endothelial/Descemet's membrane complex (En/DM) characteristics in diagnosing corneal graft rejection. DESIGN: Diagnostic reliability study. METHODS: 139 eyes (96 corneal grafts post penetrating keratoplasty or Descemet's stripping automated endothelial keratoplasty: 40 clear, 23 actively rejecting, 24 rejected and 9 non-immunological failed grafts, along with 43 age-matched control eyes) were imaged using high-definition optical coherence tomography...
March 1, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28258574/aquaporins-in-the-eye
#8
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/28257383/conjunctival-tattoo-with-inadvertent-globe-penetration-and-associated-complications
#9
Natasha Ferreira Santos da Cruz, Kátia Santana Santos, Michelle de Lima Farah, Sergio Felberg
PURPOSE: To report a case of conjunctival tattooing for cosmetic purposes with inadvertent globe penetration resulting in severe inflammation, capsular lens opacity, and secondary glaucoma. METHODS: Case report. RESULTS: A 25-year-old woman experienced severe ocular pain and decreased vision in the left eye after conjunctival tattooing for cosmetic purposes on the previous day. Slit-lamp examination revealed black deposits over the conjunctiva, corneal endothelium, anterior chamber angle, iris, and anterior capsular lens due to the tattooing pigment...
March 1, 2017: Cornea
https://www.readbyqxmd.com/read/28257382/customized-corneal-cross-linking-a-mathematical-model
#10
Ciro Caruso, Robert L Epstein, Carmine Ostacolo, Luigi Pacente, Salvatore Troisi, Gaetano Barbaro
PURPOSE: To improve the safety, reproducibility, and depth of effect of corneal cross-linking with the ultraviolet A (UV-A) exposure time and fluence customized according to the corneal thickness. METHODS: Twelve human corneas were used for the experimental protocol. They were soaked using a transepithelial (EPI-ON) technique using riboflavin with the permeation enhancer vitamin E-tocopheryl polyethylene glycol succinate. The corneas were then placed on microscope slides and irradiated at 3 mW/cm for 30 minutes...
March 1, 2017: Cornea
https://www.readbyqxmd.com/read/28251158/molecular-and-histopathological-changes-associated-with-keratoconus
#11
REVIEW
Mariam Lotfy Khaled, Inas Helwa, Michelle Drewry, Mutsa Seremwe, Amy Estes, Yutao Liu
Keratoconus (KC) is a corneal thinning disorder that leads to loss of visual acuity through ectasia, opacity, and irregular astigmatism. It is one of the leading indicators for corneal transplantation in the Western countries. KC usually starts at puberty and progresses until the third or fourth decade; however its progression differs among patients. In the keratoconic cornea, all layers except the endothelium have been shown to have histopathological structural changes. Despite numerous studies in the last several decades, the mechanisms of KC development and progression remain unclear...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28228349/identification-of-prdm-genes-in-human-corneal-endothelium
#12
Kostadin Rolev, G O'Donovan Dominic, Christiana Georgiou, Rajan Madhavan, Alexandra Chittka
Corneal endothelial cells (CECs) are essential for maintaining corneal stromal hydration and ensuring its transparency, which is necessary for normal vision. Dysfunction of CECs leads to stromal decompensation, loss of transparency and corneal blindness. Corneal endothelium has low proliferative potential compared to surface epithelial cells leading to poor regeneration of CEC following injury or age related decline in cellular density. The mechanisms which control proliferation and differentiation of neural crest derived CEC progenitors are yet to be clearly elucidated...
February 19, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28226740/automated-morphometric-description-of-human-corneal-endothelium-from-in-vivo-specular-and-confocal-microscopy
#13
F Scarpa, A Ruggeri, F Scarpa, A Ruggeri, A Ruggeri, F Scarpa
Corneal images acquired by in-vivo specular and confocal microscopy provide clinical information on the cornea endothelium health state. Indeed, the normal hexagonal shape of endothelial cells is usually affected by age and pathologies. At present, the analysis is based on manual or semi-automatic methods and the segmentation of a large number of endothelial cells is required for a meaningful estimation of the clinical parameters. We propose an automated method that detects the centers of endothelial cells by convolving the original image with customized two-dimensional kernels, derives a structure made by connected vertices from the recognized centers using the Euclidean distance, and fine-tunes the derived structure through a genetic algorithm, which combines information about the typical regularity of endothelial cells shape with the pixels intensity of the actual image...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28209236/epithelial-downgrowth-report-of-2-cases-diagnosed-by-ocular-biopsy
#14
REVIEW
Hershel R Patel, Curtis E Margo
Epithelial downgrowth is an uncommon complication of ocular surgery or adverse consequence of accidental trauma, caused by surface squamous epithelium that has gained access to the inner compartments of the eye. Once embedded in the eye, squamous epithelium spreads over contiguous structures, interfering with normal aqueous outflow and vision. The pursuit of improved therapies is ongoing, but the greatest chance of preventing blindness is with early recognition. Two cases of epithelial downgrowth diagnosed from a corneal button and an iris biopsy are presented to familiarize pathologists with this disorder...
February 2017: Annals of Diagnostic Pathology
https://www.readbyqxmd.com/read/28181929/corneal-endothelial-cell-integrity-in-precut-human-donor-corneas-enhanced-by-autocrine-vasoactive-intestinal-peptide
#15
Shay-Whey M Koh, Timothy Coll, Dante Gloria, Nicholas Sprehe
PURPOSE: To demonstrate that vasoactive intestinal peptide (VIP), a corneal endothelial (CE) cell autocrine factor, maintains the integrity of corneal endothelium in human donor corneoscleral explants precut for endothelial keratoplasty. METHODS: Twelve paired human donor corneoscleral explants used as control versus VIP-treated explants (10 nM, 30 minutes, 37°C) were shipped (4°C) to the Lions Eye Institute for Transplantation and Research for precutting (Moria CBM-ALTK Keratome), shipped back to the laboratory, and cultured in ciliary neurotrophic factor (CNTF, 0...
April 2017: Cornea
https://www.readbyqxmd.com/read/28158775/therapeutic-potential-of-aav-mediated-mmp-3-secretion-from-corneal-endothelium-in-treating-glaucoma
#16
Jeffrey O'Callaghan, Darragh E Crosbie, Paul S Cassidy, Joseph M Sherwood, Cassandra Flügel-Koch, Elke Lütjen-Drecoll, Marian M Humphries, Ester Reina-Torres, Deborah Wallace, Anna-Sophia Kiang, Matthew Campbell, Stamer W Daniel, Darryl R Overby, Colm O'Brien, Lawrence C S Tam, Peter Humphries
No abstract text is available yet for this article.
February 1, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28151811/effect-of-trabeculotomy-on-corneal-endothelial-cell-loss-in-cases-of-after-penetrating-keratoplasty-glaucoma
#17
Ayaka Kusakabe, Naoki Okumura, Koichi Wakimasu, Kanae Kayukawa, Masami Kondo, Noriko Koizumi, Chie Sotozono, Shigeru Kinoshita, Kazuhiko Mori
PURPOSE: The aim of this study was to evaluate the effect of trabeculotomy (TLO) on glaucoma and endothelial cell loss after penetrating keratoplasty (PK). METHODS: A retrospective study was conducted on consecutive patients who underwent PK and in whom more than 24 months of follow-up was available. Patients were categorized into the PK+TLO group [ie, TLO for post-PK glaucoma (n = 10)] and the PK group [PK alone (n = 73)]. Intraocular pressure (IOP) was evaluated during each follow-up examination...
March 2017: Cornea
https://www.readbyqxmd.com/read/28146239/combined-pi3k-akt-and-smad2-activation-promotes-corneal-endothelial-cell-proliferation
#18
Alfonso L Sabater, Enrique J Andreu, María García-Guzmán, Tania López, Gloria Abizanda, Victor L Perez, Javier Moreno-Montañés, Felipe Prósper
Purpose: The purpose of this study was to develop a culture method for expansion of corneal endothelial cells (CEC) based on the combined activation of PI3K/Akt and Smad2. Methods: Morphology, proliferation, and migration of cultured rabbit and nonhuman primate CEC were examined in the presence of the PI3K/Akt activators IGF-1 and heregulin beta in combination with the Smad2 activator activin A. Phenotypic characterization of CEC was performed at the RNA and protein levels...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28135362/identification-of-circulating-fibrocytes-and-dendritic-derivatives-in-corneal-endothelium-of-patients-with-fuchs-dystrophy
#19
An-Katrien De Roo, Jasper Wouters, Olivier Govaere, Beatrijs Foets, Joost J van den Oord
Purpose: Fuchs' endothelial corneal dystrophy (FECD) is a degenerative eye disorder affecting 4% of Americans older than 40. It is the leading indication for corneal endothelial (CE) transplantation for which there is a global donor shortage. This study aimed to gain further insight into the pathophysiology of FECD and identify targets for nonsurgical therapy. Methods: CE from patients with late-onset FECD was compared with that of normal controls using microarray expression analysis (n = 4 FECD, n = 4 normal), reverse transcriptase quantitative PCR (n = 9 FECD, n = 8 normal), and immunohistology (n = 55 FECD, n = 15 normal)...
January 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28128337/cornea-organoids-from-human-induced-pluripotent-stem-cells
#20
James W Foster, Karl Wahlin, Sheila M Adams, David E Birk, Donald J Zack, Shukti Chakravarti
The cornea is the transparent outermost surface of the eye, consisting of a stratified epithelium, a collagenous stroma and an innermost single-cell layered endothelium and providing 2/3 of the refractive power of the eye. Multiple diseases of the cornea arise from genetic defects where the ultimate phenotype can be influenced by cross talk between the cell types and the extracellular matrix. Cell culture modeling of diseases can benefit from cornea organoids that include multiple corneal cell types and extracellular matrices...
January 27, 2017: Scientific Reports
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