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https://www.readbyqxmd.com/read/29773311/-corneal-endothelial-cell-therapy-a-review
#1
REVIEW
V Kocaba, O Damour, C Auxenfans, C Burillon
In France, endothelial dysfunction represents approximately one half of the indications for corneal transplants performed each year. However, the use of endothelial keratoplasty is limited by the technical difficulty of the procedure, a shortage of available grafts, and the potential for graft failure or rejection. These limitations are driving researchers to develop new, less invasive, and more effective therapies. Corneal endothelial cell therapy is being explored as a potential therapeutic measure, to avoid the uncertainty associated with grafting...
May 14, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29765440/prevalence-of-bacteria-and-fungi-in-samples-of-cornea-preservation-fluid
#2
Grażyna Broniek, Ewa Langwińska-Wośko, Małgorzata Sybilska, Jerzy Szaflik, Jacek P Szaflik, Marta Wróblewska
Introduction: Recipients of corneal transplants are at risk of healthcare-associated infections, which, apart from other causes of surgical site infections, may also occur as a result of the transfer of infected corneal tissue. In this study we assessed the risk of bacterial and fungal infections based on the results of routine microbiological testing of cornea preservation fluid samples. Material and methods: We examined a total of 725 samples of corneal preservation fluid, obtained during a period of 3 years (2011-2013)...
April 2018: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/29763611/risk-of-glaucoma-surgery-after-corneal-transplant-surgery-in-medicare-patients
#3
Chengjie Zheng, Fei Yu, Victoria L Tseng, Flora Lum, Anne L Coleman
PURPOSE: Glaucoma is a well-documented complication of corneal transplants, contributing significantly to ultimate visual loss. Reported incidence of glaucoma following corneal transplants is highly variable, and definitions of post-transplant glaucoma are inconsistent. Here we use glaucoma surgery as a more rigid and specific endpoint to compare rates following different corneal transplant surgeries. DESIGN: Retrospective cohort study METHODS: A 5% random sample of Medicare beneficiaries from 2010-2013 was obtained and patients were identified with Current Procedural Terminology (CPT) codes for penetrating keratoplasty (PK), endothelial keratoplasty (EK), anterior lamellar keratoplasty (ALK), and keratoprosthesis (KPro)...
May 12, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29756410/the-feasibility-and-efficacy-of-preparing-porcine-descemet-s-membrane-endothelial-keratoplasty-dmek-grafts-by-two-techniques-an-ex-vivo-investigation-for-future-xeno-dmek
#4
Yang Liu, Jing Zhang, Yingnan Zhang, Mingyang Yin, Sen Miao, Qingfeng Liang, Zhiqiang Pan
BACKGROUND: Descemet's membrane endothelial keratoplasty (DMEK) might be a promising technique for future xeno-corneal transplantation due to its ultrathin graft, extremely low rejection occurrence, suture-free graft fixation, and minimal immunosuppressive regime usage. The aim of this study is to explore the feasibility and efficacy of preparing porcine DMEK grafts by 2 techniques and investigate the graft ultrastructure. METHODS: Two mainstream techniques, mechanical stripping technique and liquid bubble technique, were modified to prepare the porcine DMEK grafts...
May 13, 2018: Xenotransplantation
https://www.readbyqxmd.com/read/29746333/effect-of-diabetes-mellitus-and-metformin-on-central-corneal-endothelial-cell-density-in-eye-bank-eyes
#5
Isaac M Chocron, Dinesh K Rai, Ji-Won Kwon, Nicole Bernstein, Jimmy Hu, Moonseong Heo, Jimmy K Lee, Patrick K Gore, Mitchell D McCartney, Roy S Chuck
PURPOSE: To determine whether metformin use and diabetes mellitus (DM) affect central corneal endothelial cell density (ECD) by examining an eye bank corneal donor database. METHODS: The Lions Eye Institute corneal donor database, which consists of 38,318 corneal samples, was examined. Associations of ECD with metformin use and DM were tested by mixed effects linear models that account for correlations of outcomes between eyes within subjects adjusting for age, intraocular lens status, and glaucoma...
May 4, 2018: Cornea
https://www.readbyqxmd.com/read/29746326/donor-cornea-harvest-techniques-comparison-between-globe-enucleation-and-in-situ-corneoscleral-disc-excision
#6
Filip Filev, Eileen Bigdon, Nils Alexander Steinhorst, A Kammal, Carolin Schröder, Birgit Wulff, Stephan Linke, Jana Feuerstacke, Olaf Hellwinkel
PURPOSE: To compare whole eye enucleation and corneoscleral disc (CD) excision as donor cornea harvesting techniques for possible effects on corneal cultivation and the clinical outcome of the corneal grafts after transplantation in 2929 cases. METHODS: A retrospective analysis was performed on the Hamburg Eye Bank database using comparative statistics. The standard method for donor cornea recovery at the Hamburg Eye Bank changed from enucleation of the whole eye to CD in situ excision in 2008...
May 8, 2018: Cornea
https://www.readbyqxmd.com/read/29734152/cell-sheet-engineering-and-kidney-diseases
#7
Masatoshi Oka, Yoei Miyabe, Naoko Sugiura, Kosaku Nitta
Treatment using the cell sheet technology has been applied to various organs, including the cornea, heart, esophagus, periodontium, cartilage, middle ear, and lungs. It has been shown that the therapeutic efficacy of cell sheet transplantation involves 2 aspects, supplementation of cells and provision of cytokines to the affected organ. In addition, cell sheet transplantation also promotes repair of damage through the paracrine effects of cytokines derived from the transplanted cells. It is known that in cases of cell transplantation by injection, the transplanted cells are less likely to differentiate into renal tissue to supply cells, but repair is promoted by the actions of the transplanted cell-derived renotropic factors...
2018: Contributions to Nephrology
https://www.readbyqxmd.com/read/29728574/pathological-conversion-of-regulatory-t-cells-is-associated-with-loss-of-allotolerance
#8
Jing Hua, Takenori Inomata, Yihe Chen, William Foulsham, William Stevenson, Tina Shiang, Jeffrey A Bluestone, Reza Dana
CD4+ CD25+ Foxp3+ Regulatory T cells (Tregs) play a critical role in immune tolerance. The plasticity and functional adaptability of Tregs in an inflammatory microenvironment has been demonstrated in autoimmunity. Here, using a double transgenic mouse model that permits Foxp3 lineage tracing, we investigated the phenotypic plasticity of Foxp3+ Tregs in a well-characterized murine model of corneal transplantation. In order to subvert the normal immune privilege of the cornea and foster an inflammatory milieu, host mice were exposed to desiccating stress prior to transplantation...
May 4, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29728238/a-fully-automated-cell-segmentation-and-morphometric-parameter-system-for-quantifying-corneal-endothelial-cell-morphology
#9
Shumoos Al-Fahdawi, Rami Qahwaji, Alaa S Al-Waisy, Stanley Ipson, Maryam Ferdousi, Rayaz A Malik, Arun Brahma
BACKGROUND AND OBJECTIVE: Corneal endothelial cell abnormalities may be associated with a number of corneal and systemic diseases. Damage to the endothelial cells can significantly affect corneal transparency by altering hydration of the corneal stroma, which can lead to irreversible endothelial cell pathology requiring corneal transplantation. To date, quantitative analysis of endothelial cell abnormalities has been manually performed by ophthalmologists using time consuming and highly subjective semi-automatic tools, which require an operator interaction...
July 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29723082/microbial-analysis-of-donor-corneoscleral-rims-and-storage-media
#10
Edmund Tsui, Preston M Luong, Jessa Fogel, Erin S Fogel, Michael E Zegans
PURPOSE: We aim to investigate bacterial and fungal cultures of hypothermic donor corneal storage media (Optisol-GS) and donor rims. METHODS: All corneal transplants performed from January 1, 2015 to June 30, 2016 by a single surgeon at a single facility were retrospectively reviewed. Aerobic, anaerobic, and fungal cultures were routinely obtained from all donor rims and cornea storage media. Culture results and clinical courses were recorded. RESULTS: Eighty-four corneal transplants were performed...
May 3, 2018: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/29708936/frequency-of-complications-during-preparation-of-corneal-lamellae-used-in-posterior-lamellar-keratoplasty-using-the-pneumodissection-technique-big-bubble
#11
Pavel Studeny, Magdalena Netukova, Martin Hlozanek, Jan Bednar, Katerina Jirsova, Deli Krizova
PURPOSE: To determine the frequency of formation of various types of bubbles and the potential impact of donor and lamella parameters on this frequency, and to identify possible risk factors of unsuccessful "big-bubble" creation in preparation of pre-Descemet endothelial keratoplasty and Descemet membrane endothelial keratoplasty with peripheral stromal support. METHODS: Donor age and sex, death to preservation time (DPT), storage time, presence of corneal scars (mainly a condition after cataract surgery), and endothelial cell density of 256 donor corneas were assessed before Descemet membrane endothelial keratoplasty with peripheral stromal support or pre-Descemet endothelial keratoplasty lamella preparation using the big-bubble technique...
April 26, 2018: Cornea
https://www.readbyqxmd.com/read/29700566/microeconomic-benefit-of-corneal-transplantation-in-a-developing-country-via-public-private-partnership-model
#12
Rahul M Jindal, Stephen G Waller, Shailendra Sugrim, Jan Pasternak, Joseph Pasternak
BACKGROUND: We measured the microeconomic benefit, QOL, DALYs averted and clinical outcomes of corneal transplant surgery via a public-private partnership in Guyana. Corneas were obtained, ex gratia, from US eye banks, and the work was done at no cost to the patient or the Governments of USA or Guyana. METHODS: We obtained qualitative data using a "semi-structured interview technique" to question 60 recent recipients of corneal transplants in Guyana. Our questions covered schooling in children, training for job, and type and income of job, both before and after surgery...
April 26, 2018: World Journal of Surgery
https://www.readbyqxmd.com/read/29698993/evolution-of-keratoconus-from-diagnosis-to-therapeutics
#13
Lauren Marie Imbornoni, Charles Ninian John McGhee, Michael Wellington Belin
This review describes the evolution of the diagnosis and treatment of keratoconus from the earliest written description to present day. The first description was provided in 1736 by Benedict Duddell who described the prominent corneas of a fourteen-year-old boy. Throughout the 19th century, a variety of surgical procedures were proposed to manage the disease, such as surgically repositioning the pupil away from the cone, iris incarceration to produce a slit-like pupil, cauterization of the cone to produce a scar, and full thickness elliptical excision of the cone...
April 26, 2018: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29691018/carboxymethyl-chitosan-gelatin-hyaluronic-acid-blended-membranes-as-epithelia-transplanting-scaffold-for-corneal-wound-healing
#14
Wenhua Xu, Zheying Wang, Ying Liu, Liping Wang, Zhiwen Jiang, Tong Li, Wenhua Zhang, Ye Liang
There is an unmet need for an optimal scaffold as cell transplantation carrier to induce corneal reconstruction. In this study, a blend membrane was prepared with carboxymethyl chitosan (CMCTS), gelatin, and hyaluronic acid. To investigate its cytocompatibility, primary rabbit corneal epithelial cells (CEpCs) were seeded on it and growth and proliferation were evaluated. The blend membrane was found to be transparent, biodegradable, and suitable for CEpCs attachment and proliferation, which could maintain the epithelial cell-like protein expression of CEpCs...
July 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29686829/the-potential-role-of-bioengineering-and-three-dimensional-printing-in-curing-global-corneal-blindness
#15
REVIEW
Parker E Ludwig, Trevor J Huff, Jorge M Zuniga
An insufficiency of accessible allograft tissue for corneal transplantation leaves many impaired by untreated corneal disease. There is promise in the field of regenerative medicine for the development of autologous corneal tissue grafts or collagen-based scaffolds. Another approach is to create a suitable corneal implant that meets the refractive needs of the cornea and is integrated into the surrounding tissue but does not attempt to perfectly mimic the native cornea on a cellular level. Materials that have been investigated for use in the latter concept include natural polymers such as gelatin, semisynthetic polymers like gelatin methacrylate, and synthetic polymers...
January 2018: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/29683519/children-with-mucopolysaccharidosis-risk-progressive-visual-dysfunction-despite-haematopoietic-stem-cell-transplants
#16
Kristina Teär Fahnehjelm, Monica Olsson, Enping Chen, Jürg Hengstler, Karin Naess, Jacek Winiarski
AIM: This prospective study assessed the long-term ocular and visual outcomes of children with mucopolysaccharidoses type I Hurler syndrome (MPS IH) who were treated with haematopoietic stem cell transplants (HSCT). METHODS: Clinical ophthalmological assessments were performed on eight patients at the St Erik Eye Hospital, Stockholm, Sweden, from 2001-2018: The median age at diagnosis and HSCT were 12.2 (range 5.0-16.4) and 16.7 (8.0-20.4) months. The last eye examination was at a median of 13...
April 23, 2018: Acta Paediatrica
https://www.readbyqxmd.com/read/29681834/amnwiotic-membrane-transplantation-as-a-treatment-for-sterile-infiltration-and-corneal-melting-after-corneal-crosslinking-for-keratoconus
#17
Takanori Sasaki, Takeshi Ide, Ikuko Toda, Naoko Kato
We report a case of corneal melting through sterile infiltration presumably due to excessive use of nonsteroidal anti-inflammatory eye drops after corneal crosslinking (CXL). It was treated using steroids combined with amniotic membrane transplantation (AMT). A 33-year-old man with progressing keratoconus underwent left eye CXL. We prescribed betamethasone and levofloxacin eye drops 5 times daily and diclofenac sodium eye drops 3 times daily for 3 days. Three days after CXL, there was a persistent epithelial defect and the left corneal stroma was clouded...
January 2018: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/29661447/chronological-factors-of-the-process-of-donation-and-classification-of-corneal-tissue
#18
G K P Cruz, M A Ferreira Júnior, S Balbino da Silva, I C de Azevedo, V E P Santos, M L Ivo
INTRODUCTION: The quality of corneal tissue is influenced by several factors inherent to the recipient, donor, donation process, and transplantation that may primarily or secondarily interfere in the survival of a corneal graft. OBJECTIVE: The objective of this study was to identify the factors inherent to the donation process, specifically related to the harvesting and processing of tissue and to the donor, that may interfere with the quality of corneal tissue...
April 2018: Transplantation Proceedings
https://www.readbyqxmd.com/read/29660548/how-to-deal-with-the-empty-space-after-organ-removal-for-transplantation-a-single-medical-center-experience
#19
Ding-Ping Sun, Ling-Hsien Lee, Yu-Feng Tian, Hong-Xiang Zheng, Jinn-Rung Kuo, Che-Chuan Wang
PURPOSE: Dealing with the empty space after organ removal for transplantation has not been investigated. MATERIALS AND METHODS: From January 28, 2005, to November 21, 2017, 111 organ donors were enrolled in this study. They were divided into three groups: no replacement, replaced with paper printed with organ graphics, or replaced with 3D-printed simulated organs after the organs were removed at different periods. The donor's age, gender, etiology of admission, characteristic and clinical pictures, time interval between admission and the date of donation, and time interval between donor coordinator consultations were evaluated...
April 13, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29656016/riding-the-cell-jamming-boundary-geometry-topology-and-phase-of-human-corneal-endothelium
#20
Nigel H Brookes
It is important to assess the viability of eye-banked corneas prior to transplantation due to inherent senescence and known loss of endothelial cells during surgical manipulation. Corneal endothelial cells have a complex basal and paracellular shape making them challenging to accurately measure, particularly in oedematous ex vivo tissue. This study used calibrated centroidal Voronoi Diagrams to segment cells in images of these human corneas, in order to characterize endothelial geometry, topology, and phase...
April 12, 2018: Experimental Eye Research
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