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Corneal Transplantation

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https://www.readbyqxmd.com/read/29777547/tacrolimus-induced-asymptomatic-thrombotic-microangiopathy-diagnosed-by-laboratory-tests-in-pig-to-rhesus-corneal-xenotransplantation-a-case-report
#1
Jong-Min Kim, Jaeyoung Kim, Se-Hyun Choi, Jun-Seop Shin, Byoung-Hoon Min, Won Young Jeong, Ga-Eul Lee, Min-Sun Kim, Seeun Kwon, Mee Kum Kim, Chung-Gyu Park
Tacrolimus-associated thrombotic microangiopathy (TA-TMA) is a rare complication. TA-TMA is characterized by microangiopathic hemolytic anemia, thrombocytopenia, and organ damage due to thrombus. We report asymptomatic TA-TMA diagnosed by laboratory tests in pig-to-rhesus corneal xenotransplantation. Corneal transplantation had been conducted from a wild-type SNU miniature pig to a rhesus macaque. The veterinary records were retrospectively reviewed in this case. The immunosuppressive regimen consisted of rituximab, basiliximab, and IVIg as inductive therapies, and steroids with tacrolimus (0...
May 18, 2018: Xenotransplantation
https://www.readbyqxmd.com/read/29774506/therapeutic-potential-of-mesenchymal-stem-cell-derived-exosomes-in-the-treatment-of-eye-diseases
#2
C Randall Harrell, Bojana Simovic Markovic, Crissy Fellabaum, Aleksandar Arsenijevic, Valentin Djonov, Nebojsa Arsenijevic, Vladislav Volarevic
Mesenchymal stem cells (MSCs) were, due to their immunomodulatory and pro-angiogenic characteristics, extensively explored as new therapeutic agents in cell-based therapy of uveitis, glaucoma, retinal and ocular surface diseases.Since it was recently revealed that exosomes play an important role in biological functions of MSCs, herewith we summarized current knowledge about the morphology, structure, phenotype and functional characteristics of MSC-derived exosomes emphasizing their therapeutic potential in the treatment of eye diseases...
May 18, 2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29773311/-corneal-endothelial-cell-therapy-a-review
#3
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/29772228/3d-bioprinting-of-a-corneal-stroma-equivalent
#4
Abigail Isaacson, Stephen Swioklo, Che J Connon
Corneal transplantation constitutes one of the leading treatments for severe cases of loss of corneal function. Due to its limitations, a concerted effort has been made by tissue engineers to produce functional, synthetic corneal prostheses as an alternative recourse. However, successful translation of these therapies into the clinic has not yet been accomplished. 3D bioprinting is an emerging technology that can be harnessed for the fabrication of biological tissue for clinical applications. We applied this to the area of corneal tissue engineering in order to fabricate corneal structures that resembled the structure of the native human corneal stroma using an existing 3D digital human corneal model and a suitable support structure...
May 14, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29765440/prevalence-of-bacteria-and-fungi-in-samples-of-cornea-preservation-fluid
#5
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/29763694/corneal-fluorescein-staining-and-ocular-symptoms-but-not-schirmer-test-are-useful-as-indicators-of-response-to-treatment-in-chronic-ocular-gvhd
#6
Francisco Amparo, Hasanain Shikari, Ujwala Saboo, Reza Dana
PURPOSE: To evaluate long-term ocular surface clinical signs and symptoms response to therapy in patients with chronic ocular GVHD. METHODS: Retrospective review and data modeling. We reviewed the records of post-bone marrow transplantation patients who were newly diagnosed with ocular GVHD and initiated therapy, and analyzed changes in symptoms (Ocular Surface Disease Index [OSDI]; Symptom Assessment in Dry Eye [SANDE]) and signs (corneal fluorescein staining [CFS]; Schirmer test)...
May 12, 2018: Ocular Surface
https://www.readbyqxmd.com/read/29763611/risk-of-glaucoma-surgery-after-corneal-transplant-surgery-in-medicare-patients
#7
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
#8
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/29749994/simultaneous-presence-of-macular-corneal-dystrophy-and-retinitis-pigmentosa-in-three-members-of-a-family
#9
Farhad Nejat, Hossein Aghamollaei, Shiva Pirhadi, Khosrow Jadidi, Mohammad Amin Nejat
Macular corneal dystrophy (MCD) is an autosomal recessive hereditary disease. In most cases, various mutations in carbohydrate sulfotransferase 6 (CHST6) gene are the main cause of MCD. These mutations lead to a defect in keratan sulfate synthesis. Retinitis pigmentosa (RP) is another eye disorder with nyctalopia as its common symptom. It has been shown that more than 65 genes have been implicated in different forms of RP. Herein, we report on a 9-member family with 2 girls and 5 boys. Both parents, one of the girls and one of the boys had normal eye vision and another boy had keratoconus...
March 2018: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29746333/effect-of-diabetes-mellitus-and-metformin-on-central-corneal-endothelial-cell-density-in-eye-bank-eyes
#10
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/29746327/pediatric-corneal-transplants-review-of-current-practice-patterns
#11
Angela Y Zhu, Maria Carolina Marquezan, Courtney L Kraus, Christina R Prescott
PURPOSE: To facilitate development of standardized guidelines for management of pediatric patients undergoing keratoplasty, particularly the youngest cohort, through a comprehensive survey assessing recent trends in practice patterns of corneal specialists and pediatric ophthalmologists. METHODS: A cross-sectional, observational study of current practices pertaining to pediatric keratoplasty was performed by designing a 20-question survey focused on preoperative indications, surgical techniques, and postoperative management...
May 8, 2018: Cornea
https://www.readbyqxmd.com/read/29746326/donor-cornea-harvest-techniques-comparison-between-globe-enucleation-and-in-situ-corneoscleral-disc-excision
#12
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/29735006/rejection-prophylaxis-in-corneal-transplant
#13
Daniel Böhringer, Birgit Grotejohann, Gabriele Ihorst, Helga Reinshagen, Eric Spierings, Thomas Reinhard
BACKGROUND: Graft rejection. Twenty to thirty percent of patients with corneal transplants experience at least one rejection episode in the first 5 years after transplantation. Prophylaxis through matching for human leukocyte antigens (HLA) is controversial. We herein report the results of the Functional ANtigen matChing in keratoplastY (FANCY) trial. METHODS: FANCY was a randomized, double-blind, multicenter clinical trial. The primary objective was to evaluate superiority of HLA matching versus random graft assignment...
April 13, 2018: Deutsches Ärzteblatt International
https://www.readbyqxmd.com/read/29728574/pathological-conversion-of-regulatory-t-cells-is-associated-with-loss-of-allotolerance
#14
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
#15
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/29726063/inter-species-incompatibilities-limit-the-immunomodulatory-effect-of-human-mesenchymal-stromal-cells-in-the-rat
#16
Paul Lohan, Oliver Treacy, Maurice Morcos, Ellen Donohoe, Yvonne O'Donoghue, Aideen E Ryan, Stephen J Elliman, Thomas Ritter, Matthew D Griffin
Mesenchymal stem/stromal cells (MSC) are an immunomodulatory cell population which are under pre-clinical and clinical investigation for a number of inflammatory conditions including transplantation. In this study, a well-established rat corneal transplantation model was used to test the ability of human MSC to prolong corneal allograft rejection-free survival using a pre-transplant intravenous infusion protocol previously shown to be efficacious with allogeneic rat MSC. Surprisingly, pre-transplant administration of human MSC had no effect on corneal allograft survival...
May 3, 2018: Stem Cells
https://www.readbyqxmd.com/read/29724209/microbial-keratitis-induced-endophthalmitis-incidence-symptoms-therapy-visual-prognosis-and-outcomes
#17
Daniel Zapp, Daria Loos, Nikolaus Feucht, Ramin Khoramnia, Tamer Tandogan, Lukas Reznicek, Christian Mayer
BACKGROUND: To evaluate symptoms, therapies and outcomes in rare microbial keratitis-induced endophthalmitis. METHODS: Retrospective study with 11 patients treated between 2009 and 2014. Clinical findings, corneal diseases, history of steroids and trauma, use of contact lenses, number and type of surgical interventions, determination of causative organisms and visual acuity (VA) were evaluated. RESULTS: The incidence of transformation from microbial keratitis to an endophthalmitis was 0...
May 3, 2018: BMC Ophthalmology
https://www.readbyqxmd.com/read/29723889/medical-and-semi-surgical-treatments-for-fuchs-endothelial-corneal-dystrophy
#18
Katrin Wacker, Keith H Baratz, Michael P Fautsch, Sanjay V Patel
Unraveling the genetic mechanisms of Fuchs endothelial corneal dystrophy has opened new possibilities for future targeted medical therapy of the disease. Until these possibilities mature, regenerative semi-surgical approaches by cell injection or cell sheet transfer could help expand the donor pool, and possibly enable autologous transplantation. Descemet membrane stripping alone and acellular Descemet membrane transfer are more immediate surgical approaches that could be temporary treatments in some patients, though there is a lack of understanding of the factors that predict success for these procedures...
May 3, 2018: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29723082/microbial-analysis-of-donor-corneoscleral-rims-and-storage-media
#19
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
#20
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
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