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Cornea transplant

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https://www.readbyqxmd.com/read/28428556/treatment-of-donor-corneal-tissue-with-immunomodulatory-cytokines-a-novel-strategy-to-promote-graft-survival-in-high-risk-corneal-transplantation
#1
Maryam Tahvildari, Parisa Emami-Naeini, Masahiro Omoto, Alireza Mashaghi, Sunil K Chauhan, Reza Dana
Antigen-presenting cells (APCs) play an important role in transplant rejection and tolerance. In high-risk corneal transplantation, where the graft bed is inflamed and vascularized, immature APCs in the donor corneal stroma quickly mature and migrate to lymphoid tissues to sensitize host T cells. In this study, using a mouse model of corneal transplantation, we investigated whether enrichment of tolerogenic APCs (tolAPCs) in donor corneas can enhance graft survival in corneal allograft recipients with inflamed graft beds...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28412300/mechanisms-of-retinal-damage-after-ocular-alkali-burns
#2
Eleftherios I Paschalis, Chengxin Zhou, Fengyang Lei, Nathan Scott, Vassiliki Kapoulea, Marie-Claude Robert, Demetrios Vavvas, Reza Dana, James Chodosh, Claes H Dohlman
Alkali burns to the eye constitute a leading cause of worldwide blindness. In recent case series, corneal transplantation revealed unexpected damage to the retina and optic nerve in chemically burned eyes. We investigated the physical, biochemical, and immunological components of retinal injury after alkali burn and explored a novel neuroprotective regimen suitable for prompt administration in emergency departments. Thus, in vivo pH, oxygen, and oxidation reduction measurements were performed in the anterior and posterior segment of mouse and rabbit eyes using implantable microsensors...
April 13, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28411355/rabies-acquired-through-kidney-transplantation-in-a-child-a-case-report
#3
Bassam Saeed, Mustafa Al-Mousawi
Rabies is usually transmitted to humans through bites of infected animals; however, it can rarely be transmitted through deceased donor organs or tissues when not suspected. Here, we report a case of rabies transmission in a child. The child was a 5-year-old girl who was admitted to the pediatric intensive care unit with encephalitis of unexplained cause 3.5 months after she received a kidney transplant from a deceased donor. The laboratory and imaging studies did not reveal any explanation for her rapidly declining clinical and neurologic condition, which ended with death 4 days after admission...
April 14, 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28410357/donor-endothelial-cell-count-does-not-correlate-with-descemet-stripping-automated-endothelial-keratoplasty-transplant-survival-after-2-years-of-follow-up
#4
Ivan O Potapenko, Branka Samolov, Margareta Claesson Armitage, Berit Byström, Jesper Hjortdal
PURPOSE: To analyze the influence of low endothelial cell density (ECD) of donor cornea tissue, donor age, and sex on the transplant survival rate after Descemet stripping automated endothelial keratoplasty (DSAEK). METHODS: Graft ECD, age, and sex of donors used for DSAEK (n = 1789) during 7 years (2007-2014) in 4 Scandinavian hospitals were assessed for potential association with transplant survival at 2 years of follow-up using a Cox regression model correcting for confounding factors...
April 12, 2017: Cornea
https://www.readbyqxmd.com/read/28409225/stromal-lenticule-transplantation-for-management-of-corneal-perforations-one-year-results
#5
Mohamed Samy Abd Elaziz, Adel Galal Zaky, Abdel Rahman El SaebaySarhan
PURPOSE: To study application of stromal lenticules extracted by femtolaser small incision lenticule extraction (SMILE) surgery as a surgical adjuvant to seal corneal perforations. METHODS: Corneal stromal lenticules obtained through SMILE surgery with central thickness 100 μm or more were fixed over corneal perforation sites using 10-0 nylon interrupted stitches with an overlying single layer of amniotic membrane. Seven patients who had been followed up for a minimum of 12 months were assessed using slit-lamp biomicroscopy, fluorescein stain, tonometry, and best spectacle-corrected visual acuity (BSCVA) measurements...
April 13, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28395029/mitochondrial-and-morphologic-alterations-in-native-human-corneal-endothelial-cells-associated-with-diabetes-mellitus
#6
Benjamin T Aldrich, Ursula Schlötzer-Schrehardt, Jessica M Skeie, Kimberlee A Burckart, Gregory A Schmidt, Cynthia R Reed, M Bridget Zimmerman, Friedrich E Kruse, Mark A Greiner
Purpose: To characterize changes in the energy-producing metabolic activity and morphologic ultrastructure of corneal endothelial cells associated with diabetes mellitus. Methods: Transplant suitable corneoscleral tissue was obtained from donors aged 50 to 75 years. We assayed 3-mm punches of endothelium-Descemet membrane for mitochondrial respiration and glycolysis activity using extracellular flux analysis of oxygen and pH, respectively. Transmission electron microscopy was used to assess qualitative and quantitative ultrastructural changes in corneal endothelial cells and associated Descemet membrane...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28393447/anti-cd40-antibody-mediated-costimulation-blockade-promotes-long-term-survival-of-deep-lamellar-porcine-corneal-grafts-in-non-human-primates
#7
Jaeyoung Kim, Dong Hyun Kim, Hyuk Jin Choi, Hyun Ju Lee, Hee Jung Kang, Chung-Gyu Park, Eung-Soo Hwang, Mee Kum Kim, Won Ryang Wee
BACKGROUND: Corneal xenotransplantation is an effective solution for the shortage of human donor corneas, and the porcine cornea may be a suitable candidate for the donor cornea because of its optical similarity with humans. However, it is necessary to administer additional immunosuppressants to overcome antigenic differences. We aimed to investigate the feasibility of porcine corneas with anti-CD40 antibody-mediated costimulation blockade in a clinically applicable pig-to-non-human primate corneal xenotransplantation model...
April 10, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28385234/hyaluronic-acid-and-beta-cyclodextrins-films-for-the-release-of-corneal-epithelial-cells-and-dexamethasone
#8
Calogero Fiorica, Fabio Salvatore Palumbo, Giovanna Pitarresi, Flavia Bongiovì, Gaetano Giammona
In this work we prepared hydrogels based on hyaluronic acid and β-cyclodextrins to sustain the release of both corneal epithelial cells and dexamethasone. This steroid is administered as eye drops several times per day to reduce the risk of rejection in the post operative period after the cornea transplantation and cell release techniques. Hydrogels were produced by crosslinking an amino derivative of hyaluronic acid, with the divinyl sulfone derivative of β-cyclodextrins, this last employed as a crosslinker and solubilizing agent...
June 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28384203/comprehensive-characterization-of-dna-methylation-changes-in-fuchs-endothelial-corneal-dystrophy
#9
Emily Khuc, Russell Bainer, Marie Wolf, Selene M Clay, Daniel J Weisenberger, Jacquelyn Kemmer, Valerie M Weaver, David G Hwang, Matilda F Chan
Transparency of the human cornea is necessary for vision. Fuchs Endothelial Corneal Dystrophy (FECD) is a bilateral, heritable degeneration of the corneal endothelium, and a leading indication for corneal transplantation in developed countries. While the early onset, and rarer, form of FECD has been linked to COL8A2 mutations, the more common, late onset form of FECD has genetic mutations linked to only a minority of cases. Epigenetic modifications that occur in FECD are unknown. Here, we report on and compare the DNA methylation landscape of normal human corneal endothelial (CE) tissue and CE from FECD patients using the Illumina Infinium HumanMethylation450 (HM450) DNA methylation array...
2017: PloS One
https://www.readbyqxmd.com/read/28383624/use-of-corneas-for-transplant-after-self-inflicted-eyeballs-enucleation-in-the-italian-law
#10
G Montanari Vergallo, E Pacella, A Di Luca, N M Di Luca, R Cecchi, E Marinelli
The authors analyze from an ethical and legal point of view the case of a 37 year old man, hospitalized for four days because of a 'dissociative syndrome', who had introduced in both his orbits a portable radio antenna. Most likely, he completed the self-enuclation using his own hands. He was brought to the Ophtalmic Hospital by nurses who handed the two eyeballs to the physicians who ascertained that the corneas were intact. Then, they performed the conservative extraction. In the following days those corneas were transplanted (keratoplasty) on two subjects on the waiting list at that hospital...
March 2017: La Clinica Terapeutica
https://www.readbyqxmd.com/read/28381247/outcomes-of-descemet-stripping-automated-endothelial-keratoplasty-using-imported-donor-corneas
#11
Kaevalin Lekhanont, Kavin Vanikieti, Nutthida Nimvorapun, Varintorn Chuckpaiwong
BACKGROUND: The lack of development of local donor tissue acquisition in several regions of the world has resulted in the necessity of performing keratoplasty with imported donor corneas. The greatest concern about the use of donor corneas supplied by foreign eye banks is the effect of the increased donor death-to-operation time which inevitably occurs during the tissue recovery, tissue processing, and tissue transfer between the countries. The purpose of this study was to report the outcomes of descemet stripping automated endothelial keratoplasty (DSAEK) using imported donor corneas...
April 5, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28374155/morphometry-of-organ-cultured-corneal-endothelium-using-voronoi-segmentation
#12
Nigel H Brookes
The endothelial viability of eye-banked corneas must be assessed before transplantation, yet phase-contrast images of the endothelium of corneas stored in an Organ Culture system have a huge variety of endothelial appearance at different focal planes, due to stromal swelling and an evaluation technique that swells the cells and their intercellular spaces to make them visible. This makes them difficult to assess using common edge-based segmentation methodologies that have mostly been developed in vivo using specular microscopy...
April 3, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28358029/genome-wide-association-study-identifies-three-novel-loci-in-fuchs-endothelial-corneal-dystrophy
#13
Natalie A Afshari, Robert P Igo, Nathan J Morris, Dwight Stambolian, Shiwani Sharma, V Lakshmi Pulagam, Steven Dunn, John F Stamler, Barbara J Truitt, Jacqueline Rimmler, Abraham Kuot, Christopher R Croasdale, Xuejun Qin, Kathryn P Burdon, S Amer Riazuddin, Richard Mills, Sonja Klebe, Mollie A Minear, Jiagang Zhao, Elmer Balajonda, George O Rosenwasser, Keith H Baratz, V Vinod Mootha, Sanjay V Patel, Simon G Gregory, Joan E Bailey-Wilson, Marianne O Price, Francis W Price, Jamie E Craig, John H Fingert, John D Gottsch, Anthony J Aldave, Gordon K Klintworth, Jonathan H Lass, Yi-Ju Li, Sudha K Iyengar
The structure of the cornea is vital to its transparency, and dystrophies that disrupt corneal organization are highly heritable. To understand the genetic aetiology of Fuchs endothelial corneal dystrophy (FECD), the most prevalent corneal disorder requiring transplantation, we conducted a genome-wide association study (GWAS) on 1,404 FECD cases and 2,564 controls of European ancestry, followed by replication and meta-analysis, for a total of 2,075 cases and 3,342 controls. We identify three novel loci meeting genome-wide significance (P<5 × 10(-8)): KANK4 rs79742895, LAMC1 rs3768617 and LINC00970/ATP1B1 rs1200114...
March 30, 2017: Nature Communications
https://www.readbyqxmd.com/read/28350625/outcome-and-histopathology-of-secondary-penetrating-keratoplasty-graft-failure-managed-by-descemet-membrane-endothelial-keratoplasty
#14
Itay Lavy, Vasilios S Liarakos, Robert M Verdijk, Jack Parker, Thomas M Müller, Marieke Bruinsma, Perry S Binder, Gerrit R J Melles
PURPOSE: To describe the clinical outcome and histopathology of Descemet membrane endothelial keratoplasty (DMEK) performed for secondary graft failure after penetrating keratoplasty (PK). METHODS: A total of 11 eyes from 10 patients who underwent DMEK for secondary PK graft failure at a tertiary referral center were included in this retrospective study. Best-corrected visual acuity, endothelial cell density, and central pachymetry were evaluated before and at regular time intervals up to 36 months after DMEK and complications were recorded; 1 post mortem cornea was available for light microscopy...
March 21, 2017: Cornea
https://www.readbyqxmd.com/read/28345565/upgradation-and-modernization-of-eye-banking-services-integrating-tradition-with-innovative-policies-and-current-best-practices
#15
Radhika Tandon, Archita Singh, Noopur Gupta, M Vanathi, Vivek Gupta
PURPOSE: The purpose of this study is to review the history and evolution of the National Eye Bank (NEB) and analyze the impact over the years and report the outcome of the invested resources. METHODS: Review of archival material, records, project reports, policy and procedures' manuals, and publications was done. Descriptive and analytical processing of data obtained was undertaken. Parameters evaluated included total collection, transplantation, utilization rates of donor cornea, changing trends over time in terms of numbers and duration of recipients waiting, impactful research translated into changes in standard operating protocols, new facilities, and subsequent effects on numbers or quality assurance measures and overview of major achievements...
February 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28321999/factors-influencing-the-contamination-rate-of-human-organ-cultured-corneas
#16
Daniel Röck, Johanna Wude, Karl U Bartz-Schmidt, Efdal Yoeruek, Sebastian Thaler, Tobias Röck
PURPOSE: To assess the influence of donor, environment and storage factors on the contamination rate of organ-cultured corneas, to consider the microbiological species causing corneal contamination and to investigate the corresponding sensitivities. METHODS: Data from 1340 consecutive donor corneas were analysed retrospectively. Logistic regression analysis was used to assess the influence of different factors on the contamination rate of organ-cultured corneas for transplantation...
March 21, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28306601/assessing-the-impact-of-diabetes-mellitus-on-donor-corneal-endothelial-cell-density
#17
Chase A Liaboe, Benjamin T Aldrich, Pamela C Carter, Jessica M Skeie, Kimberlee A Burckart, Gregory A Schmidt, Cynthia R Reed, M Bridget Zimmerman, Mark A Greiner
PURPOSE: To quantify changes in endothelial cell density (ECD) of donor corneal tissue in relation to the presence or absence of a medical history of diabetes mellitus diagnosis, treatment, and complications. METHODS: A retrospective review was performed for all corneas collected at Iowa Lions Eye Bank between January 2012 and December 2015. For purposes of analysis, donor corneas were divided into 4 groups: nondiabetic, non-insulin-dependent diabetic, insulin-dependent diabetic without medical complications due to diabetes, and insulin-dependent diabetic with medical complications due to diabetes...
May 2017: Cornea
https://www.readbyqxmd.com/read/28303370/comparison-of-graft-survival-following-penetrating-keratoplasty-and-descemet-s-stripping-endothelial-keratoplasty-in-eyes-with-a-glaucoma-drainage-device
#18
Shawn M Iverson, Oriel Spierer, George C Papachristou, William J Feuer, Wei Shi, David S Greenfield, Terrence P O'Brien
PURPOSE: To compare corneal graft survival rates after penetrating keratoplasty (PK) and Descemet's stripping endothelial keratoplasty (DSEK) in patients with a glaucoma drainage device (GDD) or medically managed glaucoma. METHODS: A retrospective chart review was conducted on consecutive patients who underwent primary PK or primary DSEK. Inclusion criteria consisted of eyes with a diagnosis of glaucoma prior to corneal transplantation and a minimum of 6 months of follow-up...
March 16, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28299010/systemic-immunomodulatory-strategies-in-high-risk-corneal-transplantation
#19
REVIEW
Tulio B Abud, Antonio Di Zazzo, Ahmad Kheirkhah, Reza Dana
The cornea is the most commonly transplanted tissue in the body. Although corneal grafts generally have high success rates, transplantation onto inflamed and vascularized host beds, or so-called high-risk corneal transplantation, has a high rate of graft rejection. The management of this high-risk corneal transplantation is challenging and involves numerous measures. One of the key measures to prevent graft rejection in these cases is the use of systemic immunosuppressive agents. In this article, we will review the systemic immunosuppressive agents most commonly used for high-risk corneal transplantation, which include corticosteroids, cysclosporine A, tacrolimus, mycophenolate mofetil, and rapamycin...
January 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28286571/we-are-not-alone-a-case-for-the-human-microbiome-in-extra-intestinal-diseases
#20
EDITORIAL
S Shivaji
BACKGROUND: "Dysbiosis" in the gut microbiome has been implicated in auto-immune diseases, in inflammatory diseases, in some cancers and mental disorders. The challenge is to unravel the cellular and molecular basis of dysbiosis so as to understand the disease manifestation. MAIN BODY: Next generation sequencing and genome enabled technologies have led to the establishment of the composition of gut microbiomes and established that "dysbiosis" is the cause of several diseases...
2017: Gut Pathogens
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