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Corneal Transplant

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https://www.readbyqxmd.com/read/28339301/cultivation-of-human-oral-mucosal-explants-on-contact-lenses
#1
Barbara Zsebik, László Ujlaky-Nagy, Gergely Losonczy, György Vereb, Lili Takács
Purpose/Aim: Autologous cultivated oral mucosal (OM) epithelial transplantation has been successfully used as corneal epithelial replacement in bilateral limbal stem cell deficiency. Recently, lotrafilcon A contact lens (CL) surface was described as a suitable carrier for cultured stem cells in corneal epithelial transplantation. Our aim was to establish explant cultures from human OM on CL carriers that are free of animal-derived materials and feeder cells. MATERIALS AND METHODS: Human cadaveric 2 mm OM explants were sutured onto CL surfaces and cultivated with fetal calf serum (FCS) or human serum (HS) supplemented culture medium without feeder cells...
March 24, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28336058/large-9-mm-deep-anterior-lamellar-keratoplasty-with-clearance-of-a-6-mm-optical-zone-optimizes-outcomes-of-keratoconus-surgery
#2
Massimo Busin, Pia Leon, Yoav Nahum, Vincenzo Scorcia
PURPOSE: To evaluate the outcomes of a 9-mm deep anterior lamellar keratoplasty (DALK) with removal of the deep stroma limited to the central 6-mm optical zone. DESIGN: Prospective, noncomparative, interventional case series. PARTICIPANTS: A total of 80 consecutive keratoconic eyes without deep stromal scarring, with at least 1 postoperative examination 1 month after complete suture removal. INTERVENTION: A standardized DALK was performed, including (1) deep trephination of the recipient bed 450 to 550 μm in depth and 9 mm in diameter; (2) pneumatic dissection; (3) debulking of approximately 80% of the anterior stroma; (4) removal of the deep stroma (bubble roof) from a central 6-mm optical zone; and (5) transplantation of a 9-mm anterior corneal lamella cut by microkeratome-assisted dissection (400-μm head) and sutured with a double running 10-0 nylon suture...
March 20, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28321999/factors-influencing-the-contamination-rate-of-human-organ-cultured-corneas
#3
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/28316199/-the-research-advance-of-small-molecules-inducing-embryonic-stem-cells-to-differentiate-into-corneal-epithelial-like-cells
#4
L M Qin, H Chen, Y F Huang
Stem cells are becoming a hot topic of basic medicine and clinical research because of their wide self-renewal and differentiation potential in recent years. A number of small molecules that can be used to control stem cell self-renewal, lineage differentiation, reprogramming and regeneration could regulate stem cell fate quickly and reversibly. If small molecules could induce human embryonic stem cells to differentiate into corneal epithelial-like cells in vivo, corneal cell transplantation therapy will have unlimited source of corneal epithelium...
March 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28316190/-allogeneic-cultured-limbal-epithelial-transplantation-a-clinical-observation-of-its-treatment-effects-on-large-conjunctival-lesions
#5
J Cheng, J Y Wang, H Y Duan, S Wang, L Cong, L X Xie
Objective: To introduce the surgical methods and investigate the treatment effects of conjunctival lesion resection combined with transplantation of allogeneic limbal epithelia cultured in vitro for treatment of varied large conjunctival lesions. Methods: A retrospective analysis of case data of the patients receiving transplantation of allogeneic limbal epithelia cultured in vitro for large conjunctival lesions at Qingdao Eye Hospital from January 2013 to December 2015 was conducted. Fresh donor corneal limbal epithelial tissues were obtained for cellular digestion and isolation...
March 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28316189/-noteworthy-and-controversial-problems-of-deep-anterior-lamellar-keratoplasty
#6
H Gao
Corneal transplant is the main treatment for blindness caused by corneal diseases. The common methods of corneal transplant include penetrating keratoplasty and lamellar keratoplasty. With the advances of microsurgical instruments and technology in recent years, deep anterior lamellar keratoplasty (DALK) has gradually increased. Compared with conventional penetrating keratoplasty, the optical effects of DALK are not much different, but DALK has fewer complications. So DALK is expected to become the mainstream of corneal transplantation...
March 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28306601/assessing-the-impact-of-diabetes-mellitus-on-donor-corneal-endothelial-cell-density
#7
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...
March 16, 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
#8
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/28300738/preliminary-results-from-the-comparison-of-simple-limbal-epithelial-transplantation-with-conjunctival-limbal-autologous-transplantation-in-severe-unilateral-chronic-ocular-burns
#9
Ritu Arora, Pallavi Dokania, Aditi Manudhane, Jawahar Lal Goyal
PURPOSE: To compare the safety, efficacy, and clinical outcomes of simple limbal epithelial transplantation (SLET) with conjunctival-limbal autologous transplantation (CLAU) in severe unilateral ocular chemical burns. MATERIALS AND METHODS: Twenty patients of unilateral chronic ocular burns with more than 270° limbal stem cell deficiency and a healthy fellow eye were divided into two groups - ten patients of Group A underwent SLET while ten patients of Group B were operated for CLAU...
January 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28299010/systemic-immunomodulatory-strategies-in-high-risk-corneal-transplantation
#10
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/28297580/a-human-corneal-epithelial-cell-line-model-for-limbal-stem-cell-biology-and-limbal-immunobiology
#11
Bakiah Shaharuddin, Sajjad Ahmad, Nani Md Latar, Simi Ali, Annette Meeson
Limbal stem cell (LSC) deficiency is a visually debilitating condition caused by abnormal maintenance of LSCs. It is treated by transplantation of donor-derived limbal epithelial cells (LECs), the success of which depends on the presence and quality of LSCs within the transplant. Understanding the immunobiological responses of these cells within the transplants could improve cell engraftment and survival. However, human corneal rings used as a source of LSCs are not always readily available for research purposes...
March 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28286571/we-are-not-alone-a-case-for-the-human-microbiome-in-extra-intestinal-diseases
#12
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
https://www.readbyqxmd.com/read/28273942/human-corneal-endothelial-cell-cultivation-from-old-donor-corneas-with-forced-attachment
#13
Mohit Parekh, Sajjad Ahmad, Alessandro Ruzza, Stefano Ferrari
Human corneal endothelial cells (HCEnCs) are responsible for maintaining the transparency of the cornea. Damaged or diseased HCEnCs may cause blindness. Replacement of the diseased cells with a healthy donor endothelium is the only currently available treatment. Tissue-engineering can serve as an alternative to conventional donor corneal transplantation. Due to the global shortage of donor corneas, a wide interest in the development of cultured graft substitutes and artificial corneas has increased. Availability of the old donor corneas is higher especially for research...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28263034/analysis-of-the-learning-curve-for-pre-cut-corneal-specimens-in-preparation-for-lamellar-transplantation-a-prospective-single-centre-consecutive-case-series-prepared-at-the-lions-new-south-wales-nsw-eye-bank
#14
Aifric Isabel Martin, Rajnesh Devasahayam, Christopher Hodge, Simon Cooper, Gerard L Sutton
IMPORTANCE: This study represents the first paper to establish a learning curve by a single technician. BACKGROUND: Preparation of pre-cut corneal endothelial grafts commenced at Lions New South Wales Eye Bank in December 2014. The primary objective of this study was to review the safety and reliability of the preparation method during the first year of production. DESIGN: Hospital-based, prospective case series PARTICIPANTS: 234 consecutive donor corneal lenticules METHODS: Donor lenticules were prepared by a single operator using a linear cutting microkeratome...
March 6, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28260988/human-corneal-endothelial-cells-expanded-in-vitro-are-a-powerful-resource-for-tissue-engineering
#15
REVIEW
Yongsong Liu, Hong Sun, Min Hu, Min Zhu, Sean Tighe, Shuangling Chen, Yuan Zhang, Chenwei Su, Subo Cai, Ping Guo
Human corneal endothelial cells have two major functions: barrier function mediated by proteins such as ZO-1 and pump function mediated by Na-K-ATPase which help to maintain visual function. However, human corneal endothelial cells are notorious for their limited proliferative capability in vivo and are therefore prone to corneal endothelial dysfunction that eventually may lead to blindness. At present, the only method to cure corneal endothelial dysfunction is by transplantation of a cadaver donor cornea with normal corneal endothelial cells...
2017: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/28257425/corneal-stromal-stem-cells-reduce-corneal-scarring-by-mediating-neutrophil-infiltration-after-wounding
#16
Andrew J Hertsenberg, Golnar Shojaati, Martha L Funderburgh, Mary M Mann, Yiqin Du, James L Funderburgh
Corneal scarring limits vision for millions of individuals worldwide. Corneal transplantation (keratoplasty) is the standard of care for corneal opacity; however, it bears the risk of graft rejection and infection and is not universally available. Stem cell therapy holds promise as an alternative to keratoplasty. Stem cells from human corneal stroma (CSSC) induce regeneration of transparent corneal tissue in a mouse wound-healing model. In this study we investigated the mechanism by which CSSC prevent deposition of fibrotic tissue...
2017: PloS One
https://www.readbyqxmd.com/read/28257380/corneal-transplantation-in-auckland-new-zealand-1999-2009-indications-patient-characteristics-ethnicity-social-deprivation-and-access-to-services
#17
Alexandra Z Crawford, James McKelvie, Jennifer P Craig, Charles N J McGhee, Dipika V Patel
PURPOSE: To analyze characteristics and indications for corneal transplantation in patients undergoing penetrating, lamellar, and endothelial keratoplasty in Auckland, New Zealand (NZ). METHODS: Corneal transplantation data from the NZ National Eye Bank and hospital records of corneal transplant recipients in the Auckland region from January 1, 2000, to December 31, 2009, were collated. Patient demographics, preoperative diagnosis, indication, ocular and medical history, visual acuity, deprivation index, and access to transplantation surgery were analyzed...
March 1, 2017: Cornea
https://www.readbyqxmd.com/read/28253236/coordinated-generation-of-multiple-ocular-like-cell-lineages-and-fabrication-of-functional-corneal-epithelial-cell-sheets-from-human-ips-cells
#18
Ryuhei Hayashi, Yuki Ishikawa, Ryousuke Katori, Yuzuru Sasamoto, Yuki Taniwaki, Hiroshi Takayanagi, Motokazu Tsujikawa, Kiyotoshi Sekiguchi, Andrew J Quantock, Kohji Nishida
We describe a protocol for the generation of a functional and transplantable corneal epithelium derived from human induced pluripotent stem (iPS) cells. When this protocol is followed, a proportion of iPS cells spontaneously form circular colonies, each of which is composed of four concentric zones. Cells in these zones have different morphologies and immunostaining characteristics, resembling neuroectoderm, neural crest, ocular-surface ectoderm, or surface ectoderm. We have named this 2D colony a 'SEAM' (self-formed ectodermal autonomous multizone), and previously demonstrated that cells within the SEAM have the potential to give rise to anlages of different ocular lineages, including retinal cells, lens cells, and ocular-surface ectoderm...
April 2017: Nature Protocols
https://www.readbyqxmd.com/read/28251158/molecular-and-histopathological-changes-associated-with-keratoconus
#19
REVIEW
Mariam Lotfy Khaled, Inas Helwa, Michelle Drewry, Mutsa Seremwe, Amy Estes, Yutao Liu
Keratoconus (KC) is a corneal thinning disorder that leads to loss of visual acuity through ectasia, opacity, and irregular astigmatism. It is one of the leading indicators for corneal transplantation in the Western countries. KC usually starts at puberty and progresses until the third or fourth decade; however its progression differs among patients. In the keratoconic cornea, all layers except the endothelium have been shown to have histopathological structural changes. Despite numerous studies in the last several decades, the mechanisms of KC development and progression remain unclear...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28247507/development-of-retrocorneal-membrane-following-pig-to-monkey-penetrating-keratoplasty
#20
Whayoung Lee, Alex Mammen, Deepinder K Dhaliwal, Cassandra Long, Yuko Miyagawa, David Ayares, David K C Cooper, Hidetaka Hara
Recent reports of long-term survival after wild-type (WT) pig-to-monkey corneal xenotransplantation are encouraging. We experienced the rapid development of retrocorneal membranes, a rare complication after corneal allotransplantation (although seen in infants and young children). The original specific aim of the study was to determine the factors associated with successful (young) pig corneal transplantation in monkeys. However, when it was obvious that retrocorneal membranes rapidly developed, our aims became to determine the factors involved in its development after both WT and Genetically engineered (GE ) pig corneal xenotransplantation and to investigate the characteristics of the retrocorneal membrane...
January 2017: Xenotransplantation
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