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https://www.readbyqxmd.com/read/29451741/non-invasive-optical-method-for-real-time-assessment-of-intracorneal-riboflavin-concentration-and-efficacy-of-corneal-cross-linking
#1
Giuseppe Lombardo, Valentina Villari, Norberto Liborio Micali, Nancy Leone, Cristina Labate, Maria Penelope De Santo, Marco Lombardo
Keratoconus is the primary cause of corneal transplantation in young adults worldwide. Riboflavin/UV-A corneal cross-linking may effectively halt the progression of keratoconus if an adequate amount of riboflavin enriches the corneal stroma and is photo-oxidated by UV-A light for generating additional cross-linking bonds between stromal proteins and strengthening the biomechanics of the weakened cornea. Here we reported a UV-A theranostic prototype device for performing corneal cross-linking with the ability to assess corneal intrastromal concentration of riboflavin and to estimate treatment efficacy in real time...
February 16, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29436059/outcomes-of-penetrating-keratoplasty-following-autologous-cultivated-limbal-epithelial-stem-cell-transplantation
#2
Gustavo S Figueiredo, Borja Salvador-Culla, Oliver J Baylis, Hardeep S Mudhar, Majlinda Lako, Francisco C Figueiredo
PURPOSE: To investigate the outcomes of penetrating keratoplasty (PKP) following autologous cultivated limbal epithelial stem cell transplantation (CLET). METHODS: A prospective, single centre, interventional cohort study investigating patients with unilateral total limbal stem cell deficiency (LSCD) treated with CLET who underwent PKP. Patients with confirmed corneal re-epithelialization > 6 months post-CLET, and with best-corrected visual acuity (BCVA) <0...
February 13, 2018: Stem Cells
https://www.readbyqxmd.com/read/29434727/differentiation-of-rat-adipose-derived-mesenchymal-stem-cells-into-corneal-like-epithelial-cells-driven-by-pax6
#3
Jing Sun, Wei-Hua Liu, Feng-Mei Deng, Yong-Hui Luo, Ke Wen, Hong Zhang, Hai-Rong Liu, Jiang Wu, Bing-Yin Su, Yi-Lun Liu
Corneal integrity, transparency and vision acuity are maintained by corneal epithelial cells (CECs), which are continuously renewed by corneal limbal stem cells (LSCs). Deficiency of CECs and/or LSCs is associated with numerous ocular diseases. Paired box (PAX)6 is an eye development-associated transcription factor that is necessary for cell fate determination and differentiation of LSCs and CECs. In the present study, the PAX6 gene was introduced into adipose-derived rat mesenchymal stem cells (ADMSCs) to investigate whether PAX6-transfected cells were able to transdifferentiate into corneal-like epithelial cells and to further verify whether the cells were suitable as a cell source for corneal transplantation...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29429293/-deep-anterior-lamellar-keratoplasty-combined-with-antiviral-therapy-in-the-treatment-of-severe-herpes-necrotizing-stromal-keratitis
#4
S X Li, J T Wang, Y Jiang, X Wang, W Y Shi
Objective: To evaluate the efficacy of modified deep lamellar keratoplasty (DLKP) combined with antiviral medications for severe herpes necrotizing stromal keratitis. Methods: Retrospective case series study. Modified DLKP was performed in combination with antiviral medications in fifty patients (50 eyes) with severe necrotizing stromal keratitis, which was unresponsive to systemic and topical antiviral treatment for 1 week, at Shandong Eye Hospital. Before surgery, the operated eyes were examined using slit-lamp microscopy...
February 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29423280/biomaterials-enabled-cornea-regeneration-in-patients-at-high-risk-for-rejection-of-donor-tissue-transplantation
#5
M Mirazul Islam, Oleksiy Buznyk, Jagadesh C Reddy, Nataliya Pasyechnikova, Emilio I Alarcon, Sally Hayes, Philip Lewis, Per Fagerholm, Chaoliang He, Stanislav Iakymenko, Wenguang Liu, Keith M Meek, Virender S Sangwan, May Griffith
The severe worldwide shortage of donor organs, and severe pathologies placing patients at high risk for rejecting conventional cornea transplantation, have left many corneal blind patients untreated. Following successful pre-clinical evaluation in mini-pigs, we tested a biomaterials-enabled pro-regeneration strategy to restore corneal integrity in an open-label observational study of six patients. Cell-free corneal implants comprising recombinant human collagen and phosphorylcholine were grafted by anterior lamellar keratoplasty into corneas of unilaterally blind patients diagnosed at high-risk for rejecting donor allografts...
2018: NPJ Regenerative Medicine
https://www.readbyqxmd.com/read/29419553/malpractice-litigation-in-cornea-and-refractive-surgery-a-review-of-the-westlaw-database
#6
Stephanie B Engelhard, Christopher T Shah, Austin J Sim, Ashvini K Reddy
PURPOSE: To report and analyze the causes and outcomes of malpractice litigation in cornea and refractive surgery. METHODS: The WestLaw database was reviewed for all malpractice litigation related to ophthalmology in the United States between 1930 and 2014. Search terms included ophthalmology or ophthalmologist and malpractice anywhere in the retrieved results. All cases involving cornea and refractive surgery were included in this analysis, and results were compared with ophthalmology as a whole...
February 6, 2018: Cornea
https://www.readbyqxmd.com/read/29413615/functionalized-silk-fibroin-film-scaffold-using-%C3%AE-carotene-for-cornea-endothelial-cell-regeneration
#7
Do Kyung Kim, Bo Ra Sim, Jeong In Kim, Gilson Khang
Design of corneal endothelium substitute is important for replacement of cadaveric cornea tissue. Our previous study has shown the suitability of silk fibroin (SF) as a biomaterial for cornea scaffold. In this study, we used β-Carotene (β-C) to enhance the regeneration of corneal endothelial cells (CEnCs) and maintain CEnC specific function. The fabricated film scaffolds showed desired transparency and hydrophilic properties which are crucial factors for vision recovery. The cell viability, phenotype and gene expression was examined using MTT assay, immunofluorescence and reverse transcription polymerase chain reactions...
November 22, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29410297/trends-in-corneal-transplantation-from-2001-to-2016-in-germany-a-report-of-the-dog-section-cornea-and-its-keratoplasty-registry
#8
E Flockerzi, P Maier, D Böhringer, H Reinshagen, F Kruse, C Cursiefen, T Reinhard, G Geerling, N Torun, B Seitz
PURPOSE: The purpose of this retrospective panel study was to provide an overview of absolute numbers, trends in the types of and indications for corneal transplantation in Germany from 2001 to 2016. METHODS: A questionnaire about absolute numbers, types of transplantation and indications was sent to 111 ophthalmological departments in Germany out of which 94 (85%) provided their data. RESULTS: Since the year 2001, the number of corneal transplantations has increased by 1...
February 1, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29407309/clinical-implication-of-tests-for-prostate-specific-antigen-in-brain-dead-organ-donors
#9
G W Lee, J-M Lee, W J Lee, Y B Kim, Y G Min
BACKGROUND: Although cancer screening tests are not mentioned under brain-dead organ donor care guidelines in Korea, we assessed the level of prostate-specific antigen (PSA), an important prostate cancer marker, and performed prostate biopsies when needed in brain-dead organ donors. We believe that insisting on a screening test for cancer diagnosis in donors' organs is important. MATERIALS AND METHODS: Data were collected between January 2010 and July 2015 from Ajou University Hospital...
January 2018: Transplantation Proceedings
https://www.readbyqxmd.com/read/29392398/generation-and-characterisation-of-decellularised-human-corneal-limbus
#10
Kristina Spaniol, Joana Witt, Sonja Mertsch, Maria Borrelli, Gerd Geerling, Stefan Schrader
PURPOSE: Limbal epithelial stem cells (LESC) reside in a niche in the corneo-scleral transition zone. Deficiency leads to pain, corneal opacity, and eventually blindness. LESC transplantation of ex-vivo expanded human LESC on a carrier such as human amniotic membrane is a current treatment option. We evaluated decellularised human limbus (DHL) as a potential carrier matrix for the transplantation of LESC. METHODS: Human corneas were obtained from the local eye bank...
February 1, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29390295/management-of-a-neurotrophic-deep-corneal-ulcer-with-amniotic-membrane-transplantation-in-a-patient-with-functional-monocular-vision-a-case-report
#11
Tobias Röck, Karl Ulrich Bartz-Schmidt, Daniel Röck
RATIONALE: Amniotic membrane transplantation (AMT) has been performed therapeutically in humans for over 100 years. In recent 2 decades AMTs have been used increasingly and successfully to treat various types of ophthalmic indications. PATIENT CONCERNS: An 83-year-old man was referred to our eye hospital with a refractory neurotrophic deep corneal ulcer of the left eye. DIAGNOSES: The best-corrected visual acuity of the left eye was 0.5 (0...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29388397/biomaterials-for-regenerative-medicine-approaches-for-the-anterior-segment-of-the-eye
#12
REVIEW
Rachel Williams, Rebecca Lace, Stephnie Kennedy, Kyle Doherty, Hannah Levis
The role of biomaterials in tissue engineering and regenerative medicine strategies to treat vision loss associated with damage to tissues in the anterior segment of the eye has been studied for several years. This has mostly involved replacement and support for the cornea and conjunctiva. These are complex tissues with specific functional requirements for different parts of the tissue. Amniotic membrane (AM) is used in clinical practice to transplant autologous or allogenic cells to the corneal surface. Fibrin gels have also progressed to clinical use under specific conditions...
February 1, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29386617/microbial-keratitis-in-corneal-grafts-predisposing-factors-and-outcomes
#13
A C O Okonkwo, W F Siah, H D J Hogg, H Anwar, F C Figueiredo
PurposeTo identify the nature of microbial keratitis in corneal grafts and the clinical outcomes at a tertiary hospital in the United Kingdom.Patients and methodsA retrospective case series of microbial keratitis in corneal grafts at the Royal Victoria Infirmary, Newcastle upon Tyne over a 17-year period (1997-2014).ResultsA total of 759 consecutive corneal grafts were identified from the Cornea Transplantation database. Of these, 59 episodes of microbial keratitis occurred in 41 eyes of 41 patients (5.4%; 19 male, 46...
January 26, 2018: Eye
https://www.readbyqxmd.com/read/29383575/antifungal-susceptibility-morphological-and-molecular-characterization-of-lasiodiplodia-theobromae-isolated-from-a-patient-with-keratitis
#14
Priscila Dallé da Rosa, Claudete Locatelli, Karla Scheid, Diane Marinho, Lúcia Kliemann, Alexandre Fuentefria, Luciano Zubaran Goldani
Lasiodiplodia theobromae is a rare ocular pathogen. We report a patient with fungal keratitis caused by L. theobromae. The patient was a 75-year-old male, a farmer with diabetes type II, and no previous history of ocular trauma. Histopathology analysis revealed the presence fungi invading Descemet's membrane of the cornea. The fungus was characterized by septate, highly bulged fungal filaments involving full corneal thickness in the corresponding histopathology specimens. A dematiaceous mold was isolated and initally identified as L...
January 30, 2018: Mycopathologia
https://www.readbyqxmd.com/read/29376005/amniotic-membrane-transplantation-with-topical-interferon-alfa-2b-after-excision-of-ocular-surface-squamous-neoplasia
#15
Hua-Tao Xie, Ying-Ying Zhang, Dong-Ling Jiang, Jun Wu, Jia-Song Wang, Ming-Chang Zhang
To evaluate the outcome of amniotic membrane transplantation (AMT) after tumor excision followed by topical interferon alfa-2b (IFNα2b) drops for primary ocular surface squamous neoplasia (OSSN). Twelve eyes of 12 patients with a mean age of 66±10y were included. The average follow-up was 23±10mo. All 12 patients had limbal involvement. Smooth ocular surface and transparent cornea were achieved in all cases. No sign of inflammation, neovascularization, symblepharon or recurrence was noted at the last follow-up...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29374600/corneal-regeneration-a-review-of-stromal-replacements
#16
REVIEW
Steffi Matthyssen, Bert Van den Bogerd, Sorcha Ní Dhubhghaill, Carina Koppen, Nadia Zakaria
Corneal blindness is traditionally treated by transplantation of a donor cornea, or in severe cases by implantation of an artificial cornea or keratoprosthesis. Due to severe donor shortages and the risks of complications that come with artificial corneas, tissue engineering in ophthalmology has become more focused on regenerative strategies using biocompatible materials either with or without cells. The stroma makes up the bulk of the corneal thickness and mainly consists of a tightly interwoven network of collagen type I, making it notoriously difficult to recreate in a laboratory setting...
January 24, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29363574/fibroblast-growth-factor-2-induces-proliferation-and-fibrosis-via-snai1-mediated-activation-of-cdk2-and-zeb1-in-corneal-endothelium
#17
JeongGoo Lee, Eric Jung, Martin Heur
Investigating stimulation of endogenous wound healing in corneal endothelial cells (CECs) may help address the global shortage of donor corneas by decreasing the number of transplants performed for blindness due to endothelial dysfunction.  We previously reported that IL-1β stimulation leads to fibroblast growth factor (FGF2) expression, enhancing migration and proliferation of mammalian CECs.  However, FGF2 also promotes the endothelial-mesenchymal transition, which can lead to retrocorneal membrane formation and blindness...
January 23, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29361840/safety-and-efficacy-of-oxb-202-a-genetically-engineered-tissue-therapy-for-the-prevention-of-rejection-in-high-risk-corneal-transplant-patients
#18
Naghmeh Fouladi, Maria Parker, Vicky Kennedy, Katie Binley, Laura McCloskey, Julie Loader, Michelle Kelleher, Kyriacos Mitrophanous, Jt Timothy Stout, Scott Ellis
Due to both the avascularity of the cornea and the relatively immune-privileged status of the eye corneal transplantation is one of the most successful clinical transplant procedures. However in high risk patients, which account for >20% of the 180,000 transplants carried out worldwide each year, the rejection rate is high due to vascularisation of the recipient cornea. The main reason for graft failure is irreversible immunological rejection and it is therefore unsurprising that neovascularisation (both pre- and post-grafting) is a significant risk factor for subsequent graft failure...
January 23, 2018: Human Gene Therapy
https://www.readbyqxmd.com/read/29339089/concentration-gradient-of-noradrenaline-from-the-periphery-to-the-centre-of-the-cornea-a-clue-to-its-origin
#19
Luis Figueira, Carla Ferreira, Catarina Janeiro, Paula Serrao, Fernando Falcao-Reis, Daniel Moura
We set out to demonstrate that the major source of corneal catecholamines is its neuronal release from intrinsic sympathetic nerves rather than circulating or non-neuronal local production. Three concentric segments (central, intermediate, peripheral) were obtained by double trephination (9.5-7.25 mm) performed on corneas harvested from 3-4 month old rabbits and human corneas rejected for transplantation, along with aqueous humour, full iris tissue and blood samples. Endogenous catecholamines were quantified by high pressure liquid chromatography with electrochemical detection (HPLC-ED), and comparison with the uptake of radio-labelled noradrenaline (3H-NA) before and after incubation with cocaine was performed...
January 12, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29339064/factors-associated-with-early-graft-detachment-in-primary-descemet-membrane-endothelial-keratoplasty
#20
Pia Leon, Mohit Parekh, Yoav Nahum, Michael Mimouni, Giuseppe Giannaccare, Laura Sapigni, Alessandro Ruzza, Massimo Busin
PURPOSE: To evaluate the risk factors for early graft detachment in Descemet Membrane Endothelial Keratoplasty (DMEK). DESIGN: Case-control Study. METHODS: ▪ PARTICIPANTS: 173 donor corneas and 173 eyes of the patients following DMEK or DMEK in combination with phacoemulsification and IOL implantation were included. INTERVENTION: Pre-stripped DMEK grafts were transplanted using pull-through technique. At the end of surgery, the anterior chamber was filled with air, which was removed 3 hours later only if pupillary block was suspected...
January 12, 2018: American Journal of Ophthalmology
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