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Cornea transplant

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https://www.readbyqxmd.com/read/28890079/the-effect-of-chronic-pulmonary-disease-and-mechanical-ventilation-on-corneal-donor-endothelial-cell-density-and-transplant-suitability
#1
Jordan A Margo, Martha F Whiting, Clayton H Brown, Caroline K Hoover, Wuqaas M Munir
PURPOSE: To determine how chronic obstructive pulmonary disease (COPD) and mechanical ventilation time affect corneal donor endothelial cell density (ECD) and transplant suitability. DESIGN: Retrospective cohort study METHODS: Setting: institutional Study Population: 39,679 cornea donor eyes from SightLife Eye Bank between 2012-2016. Demographics, death to preservation time, ECD, lens status, medical history, time on mechanical ventilation, and suitability for transplantation were included...
September 7, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28889066/effect-of-lentivirus-mediated-gene-silencing-targeting-toll-like-receptor-2-on-corneal-allograft-transplantation-in-rats
#2
Lang Bai, Weiyi Liang, Minting Chen, Yacouba Cissé, Jing Liu, Yaru Su, Jian Yu, Qiong Liu
AIM: The present work aims to assess the effectiveness of lentiviral vector (LV) mediated Toll-like receptor 2 (TLR2) gene silencing in the survival of transplanted corneal allografts, against immune rejection, in rats. METHODS: LV mediated TLR2 small interference RNA (SiRNA) with enhanced green fluorescent protein (eGFP) [LV-TLR2-siRNA-eGFP] was realised and transfected to both rat corneal epithelial (EC) and stromal cells (SC). Multiplicity of infection (MOI) was optimized for transfection efficiency using flow cytometric (FCM) analysis...
September 7, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28883661/visualizing-micro-anatomical-structures-of-the-posterior-cornea-with-micro-optical-coherence-tomography
#3
Si Chen, Xinyu Liu, Nanshuo Wang, Xianghong Wang, Qiaozhou Xiong, En Bo, Xiaojun Yu, Shufen Chen, Linbo Liu
Diagnosis of corneal disease and challenges in corneal transplantation require comprehensive understanding of corneal anatomy, particularly that of the posterior cornea. Micro-optical coherence tomography (µOCT) is a potentially suitable tool to meet this need, owing to its ultrahigh isotropic spatial resolution, high image acquisition rate and depth priority scanning mode. In this study, we explored the ability of µOCT to visualize micro-anatomical structures of the posterior cornea ex vivo and in vivo using small and large animals...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878217/in-vivo-confocal-microscopy-evaluation-of-ocular-surface-with-graft-versus-host-disease-related-dry-eye-disease
#4
Jingliang He, Yoko Ogawa, Shin Mukai, Yumiko Saijo-Ban, Mizuka Kamoi, Miki Uchino, Mio Yamane, Nobuhiro Ozawa, Masaki Fukui, Takehiko Mori, Shinichiro Okamoto, Kazuo Tsubota
Dry eye disease (DED) is often elicited by graft-versus-host disease (GVHD), an extensive complication of hematopoietic stem cell transplantation (HSCT). To unravel the mechanism of this type of DED, in vivo confocal microscopy (IVCM) was used to investigate alterations in the state of the sub-basal nerves, dendritic cells (DCs) and globular immune cells (GICs) in the central cornea and limbal epithelia. In this study, we examined 12 HSCT recipients with GVHD-caused DED and 10 HSCT recipients without GVHD-associated DED and evaluated the clinical parameters in the 2 groups...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28873283/in-vivo-like-culture-conditions-in-a-bioreactor-facilitate-improved-tissue-quality-in-corneal-storage
#5
Richard Schmid, Ioana-Sandra Tarau, Angela Rossi, Stefan Leonhardt, Thomas Schwarz, Sebastian Schuerlein, Christian Lotz, Jan Hansmann
The cornea is the most-transplanted tissue worldwide. However, the availability and quality of grafts are limited due to the current methods of corneal storage. In this study, a dynamic bioreactor system is employed to enable the control of intraocular pressure and the culture at the air-liquid interface. Thereby, in vivo-like storage conditions are achieved. Different media combinations for endothelium and epithelium are tested in standard and dynamic conditions to enhance the viability of the tissue. In contrast to culture conditions used in eye banks, the combination of the bioreactor and biochrom medium 1 allows to preserve the corneal endothelium and the epithelium...
September 5, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28855664/oral-mucosal-epithelial-cells-grown-on-porous-silicon-membrane-for-transfer-to-the-rat-eye
#6
Yazad D Irani, Sonja Klebe, Steven J P McInnes, Marek Jasieniak, Nicolas H Voelcker, Keryn A Williams
Dysfunction of limbal stem cells or their niche can result in painful, potentially sight-threatening ocular surface disease. We examined the utility of surface-modified porous-silicon (pSi) membranes as a scaffold for the transfer of oral mucosal cells to the eye. Male-origin rat oral mucosal epithelial cells were grown on pSi coated with collagen-IV and vitronectin, and characterised by immunocytochemistry. Scaffolds bearing cells were implanted into normal female rats, close to the limbus, for 8 weeks. Histology, immunohistochemistry and a multiplex nested PCR for sry were performed to detect transplanted cells...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28831627/gender-differences-in-keratoconus-keratoplasty-a-25-year-study-in-southern-brazil-and-global-perspective
#7
Otavio A Magalhaes, Samara B Marafon, Raissa C Ferreira
PURPOSE: To compare the characteristics and outcomes of male and female patients that underwent corneal transplantation for keratoconus (KC) in Southern Brazil and worldwide. METHODS: Retrospective longitudinal study that evaluated medical records of patients who were submitted to keratoplasty between August 1990 and September 2015 in two tertiary hospitals in the state of Rio Grande do Sul (Brazil) and review of the Medline and Embase database international literature...
August 22, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28820150/component-corneal-surgery-an-update
#8
REVIEW
Prafulla K Maharana, Pranita Sahay, Deepali Singhal, Itika Garg, Jeewan S Titiyal, Namrata Sharma
Several decades ago, penetrating keratoplasty was a challenge to corneal surgeons. Constant effort by the corneal surgeon to improve the outcomes as well as utilization of the available resources has led to a revolutionary change in the field of keratoplasty. All these efforts have led to the evolution of techniques that allow a corneal surgeon to disease-specific transplant of individual layers of corneal "so-called component corneal surgery" depending on the layer of cornea affected. This has led to an improvement in corneal graft survival as well as a better utilization of corneal tissues...
August 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28816624/comparison-of-two-rabbit-models-with-deficiency-of-corneal-epithelium-and-limbal-stem-cells-established-by-different-methods
#9
Hening Zhang, Shaochun Lin, Min Zhang, Qijiong Li, Weihua Li, Wencong Wang, Minglei Zhao, Yaojue Xie, Zhiquan Li, Mian Huang, Zhichong Wang, Xiulan Zhang, Bing Huang
Limbal stem cell defect model is an important animal model that provides a basis for the study of ocular surface diseases. The rabbit cornea is of moderate size and is widely used in such studies as an experimental animal model. At present, the main modeling methods are alkali burns, and corneal limbus girdling and corneal epithelium doctoring. Each method has its own characteristics. In this study, we observed rabbit models with severe ocular surface defect established by the two methods and changes after amniotic membrane transplantation...
August 14, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28810564/clinical-efficacy-of-conjunctival-flap-surgery-in-the-treatment-of-refractory-fungal-keratitis
#10
Honorine Nizeyimana, Dan-Dan Zhou, Xiu-Fen Liu, Xiao-Tao Pan, Cong Liu, Cheng-Wei Lu, Ji-Long Hao
The aim of the present study was to investigate the use and effectiveness of a selective, partial, pedunculated (tongue-shaped) conjunctival flap (CF) for the treatment of refractory fungal keratitis (FK) with or without perforation. A total of 31 cases of corneal diseases treated by CF surgery between April 2014 and October 2015 were evaluated. Among the 31 cases, 16 cases (male:female, 11:5) with FK were selected. Logistic regression analysis was used to investigate factors associated with complications of CF surgery...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810264/mesenchymal-stem-cells-promote-diabetic-corneal-epithelial-wound-healing-through-tsg-6-dependent-stem-cell-activation-and-macrophage-switch
#11
Guohu Di, Xianli Du, Xia Qi, Xiaowen Zhao, Haoyun Duan, Suxia Li, Lixin Xie, Qingjun Zhou
Purpose: To explore the role and mechanism of bone marrow-derived mesenchymal stem cells (BM-MSCs) in corneal epithelial wound healing in type 1 diabetic mice. Methods: Diabetic mice were treated with subconjunctival injections of BM-MSCs or recombinant tumor necrosis factor-α-stimulated gene/protein-6 (TSG-6). The corneal epithelial wound healing rate was examined by fluorescein staining. The mRNA and protein expression levels of TSG-6 were measured by quantitative RT-PCR and Western blot...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28809618/corneal-donations-in-south-africa-a-15-year-review
#12
Nicholas J York, Christopher Tinley
BACKGROUND: Corneal pathology is one of the leading causes of preventable blindness in South Africa (SA). A corneal transplant can restore or significantly improve vision in most cases. However, in SA there is a gross shortage of corneal tissue available to ophthalmologists. Little has been published describing the magnitude of the problem. OBJECTIVES: To describe trends in the number of corneal donors per year in SA, the number of corneal transplants performed each year, the origin of donors, the allocation of corneas to the public or private sector, and the demographics of donors...
July 28, 2017: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/28806949/case-report-of-ocular-kaposi-s-sarcoma
#13
Jing Yang, Xiao-Fang Yin, Yong-Ping Li, Shi-You Zhou
BACKGROUND: Kaposi's sarcoma (KS) is generally considered a neoplastic disorder of vascular origin and occurs in patients with acquired immunodeficiency syndrome (AIDS) or who have received immunosuppressive treatments after an organ transplant (Soulier et al., Blood 86(4):1276-80, 1995; Viejo-Borbolla and Schulz, AIDS Rev 5(4):222-9, 2003; Schulz, J Antimicrob Chemother 45(Suppl T3):15-27, 2000; Aversa et al. Crit Rev Oncol Hematol 53(3):253-65, 2005; Mbulaiteye and Engels, Int J Cancer 119(11):2685-91, 2006; Tessari et al...
August 14, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28805579/nonmotor-manifestations-of-wilson-s-disease
#14
Samar Biswas, Neelanjana Paul, Shyamal K Das
Wilson disease (WD) is an autosomal genetic disorder characterized by excessive copper deposition initially in liver (hepatic variant) followed by brain (neuropsychiatric variant) and other organs such as cornea and kidney due to defect in biliary copper excretion. Predominant presentations of neuropsychiatric variant are extrapyramidal motor dysfunctions such as dystonias, Parkinsonism, choreoathetosis, tremor, and ataxias. Nonmotor symptoms (NMS) can appear before clinical disease expression and during ongoing disease process...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28782549/a-review-of-the-evidence-for-in-vivo-corneal-endothelial-regeneration
#15
REVIEW
Bert Van den Bogerd, Sorcha Ní Dhubhghaill, Carina Koppen, Marie-José Tassignon, Nadia Zakaria
Human corneal endothelium has long been thought to be a non-mitotic cell layer with no endogenous reparative potential. Pathologies that damage endothelial function result in corneal decompensation and, if untreated, blindness. The mainstay of treatment involves partial or complete corneal replacement, amounting to 40% of all corneal transplants performed worldwide. We summarize the case reports describing complications post-operatively in the form of (sub)total graft detachment and those resulting in post-operative bare stroma...
August 3, 2017: Survey of Ophthalmology
https://www.readbyqxmd.com/read/28777777/validation-of-catquest-9sf-a-visual-disability-instrument-to-evaluate-patient-function-after-corneal-transplantation
#16
Margareta Claesson, W John Armitage, Berit Byström, Per Montan, Branka Samolov, Ulf Stenvi, Mats Lundström
PURPOSE: Catquest-9SF is a 9-item visual disability questionnaire developed for evaluating patient-reported outcome measures after cataract surgery. The aim of this study was to use Rasch analysis to determine the responsiveness of Catquest-9SF for corneal transplant patients. METHODS: Patients who underwent corneal transplantation primarily to improve vision were included. One group (n = 199) completed the Catquest-9SF questionnaire before corneal transplantation and a second independent group (n = 199) completed the questionnaire 2 years after surgery...
September 2017: Cornea
https://www.readbyqxmd.com/read/28777100/scleral-pneumatonometry-in-penetrating-keratoplasty-a-clinical-study
#17
Otavio A Magalhaes, Anthony J Aldave
PURPOSE: To evaluate the reliability between pneumatonometry intraocular pressure (IOP) measurement in different scleral locations and corneal IOP in a penetrating keratoplasty (PK) setting. Our aim is to validate a method that can potentially be used for patients with keratoprostheses. METHODS: This is a prospective observational study of 40 patients who underwent monocular PK by a single surgeon and had no significant anterior segment condition in the contralateral eye...
October 2017: Cornea
https://www.readbyqxmd.com/read/28775329/transient-ingrowth-of-lymphatic-vessels-into-the-physiologically-avascular-cornea-regulates-corneal-edema-and-transparency
#18
Deniz Hos, Anne Bukowiecki, Jens Horstmann, Felix Bock, Franziska Bucher, Ludwig M Heindl, Sebastian Siebelmann, Philipp Steven, Reza Dana, Sabine A Eming, Claus Cursiefen
Lymphangiogenesis is essential for fluid homeostasis in vascularized tissues. In the normally avascular cornea, however, pathological lymphangiogenesis mediates diseases like corneal transplant rejection, dry eye disease, and allergy. So far, a physiological role for lymphangiogenesis in a primarily avascular site such as the cornea has not been described. Using a mouse model of perforating corneal injury that causes acute and severe fluid accumulation in the cornea, we show that lymphatics transiently and selectively invade the cornea and regulate the resolution of corneal edema...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28761380/corneal-deposits-associated-with-topical-tosufloxacin-following-penetrating-keratoplasty-a-case-report
#19
Haruki Katahira, Shigeto Kumakura, Takaaki Hattori, Hiroshi Goto
PURPOSE: To report the adverse event of topical tosufloxacin administered after penetrating keratoplasty in one patient. CASE REPORT: A 60-year-old female was referred to our hospital for treatment of vision loss due to corneal opacification, etiology was unknown. Slit lamp examination showed dense opacification in corneal stroma. Penetrating keratoplasty was performed on her left eye. She was treated with topical applications of 1.5% levofloxacin, 0.5% cefmenoxime, 0...
2017: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/28754918/activation-of-tgf-%C3%AE-signaling-induces-cell-death-via-the-unfolded-protein-response-in-fuchs-endothelial-corneal-dystrophy
#20
Naoki Okumura, Keisuke Hashimoto, Miu Kitahara, Hirokazu Okuda, Emi Ueda, Kyoko Watanabe, Makiko Nakahara, Takahiko Sato, Shigeru Kinoshita, Theofilos Tourtas, Ursula Schlötzer-Schrehardt, Friedrich Kruse, Noriko Koizumi
Fuchs endothelial corneal dystrophy (FECD) is a slowly progressive bilateral disease of corneal endothelium in which accumulation of extracellular matrix (ECM) and loss of corneal endothelial cells (CECs) are phenotypic features. The corneal endothelium maintains corneal transparency by regulating water hydration; consequently, corneal endothelial dysfunction causes serious vision loss. The only therapy for corneal haziness due to corneal endothelial diseases, including FECD, is corneal transplantation using donor corneas, and no pharmaceutical treatment is available...
July 28, 2017: Scientific Reports
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