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Limbal stem cell

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https://www.readbyqxmd.com/read/28644241/long-term-ocular-surface-stability-in-conjunctival-limbal-autograft-donor-eyes
#1
Albert Y Cheung, Enrica Sarnicola, Edward J Holland
PURPOSE: To investigate the incidence of limbal stem cell deficiency (LSCD) in donor eyes after conjunctival limbal autograft (CLAU). METHODS: An observational retrospective review was performed on all patients who underwent CLAU alone, combined keratolimbal allograft with CLAU ("Modified Cincinnati Procedure"), or combined living-related conjunctival limbal allograft (lr-CLAL) with CLAU having ≥6 months of follow-up after surgery. The outcome measures were best-corrected visual acuity (BCVA) and ocular surface status...
June 21, 2017: Cornea
https://www.readbyqxmd.com/read/28644237/outcomes-of-keratoplasty-after-ocular-surface-stem-cell-transplantation
#2
Lorena Sepsakos, Albert Y Cheung, Edward J Holland
PURPOSE: To investigate the long-term outcomes of penetrating keratoplasty (PK) and deep anterior lamellar keratoplasty (DALK) after ocular surface stem cell transplantation (OSST). METHODS: An observational retrospective review was performed on all patients who underwent OSST followed by either PK or DALK with a minimum of 6-month follow-up. RESULTS: One hundred two eyes fulfilled the inclusion criteria. The mean time to keratoplasty after OSST was 19 months, and the mean follow-up was 57 months after keratoplasty...
June 21, 2017: Cornea
https://www.readbyqxmd.com/read/28640863/induced-pluripotent-stem-cell-derived-limbal-epithelial-cells-lipsc-as-a-cellular-alternative-for-in-vitro-ocular-toxicity-testing
#3
Edith Aberdam, Isabelle Petit, Linda Sangari, Daniel Aberdam
Induced pluripotent stem cells hold great potential to produce unlimited amount of differentiated cells as cellular source for regenerative medicine but also for in vitro drug screening and cytotoxicity tests. Ocular toxicity testing is mandatory to evaluate the risks of drugs and cosmetic products before their application to human patients by preventing eye irritation or insult. Since the global ban to use animals, many human-derived alternatives have been proposed, from ex-vivo enucleated postmortem cornea, primary corneal cell culture and immortalized corneal epithelial cell lines...
2017: PloS One
https://www.readbyqxmd.com/read/28630424/characterization-of-slow-cycling-corneal-limbal-epithelial-cells-identifies-putative-stem-cell-markers
#4
R Sartaj, C Zhang, P Wan, Z Pasha, V Guaiquil, A Liu, J Liu, Y Luo, E Fuchs, M I Rosenblatt
In order to identify reliable markers of corneal epithelial stem cells, we employed an inducible transgenic "pulse-chase" murine model (K5Tta × TRE-H2BGFP) to localize, purify, and characterize slow cycling cells in the cornea. The retention of GFP labeling in slowly dividing cells allowed for localization of these cells to the corneal limbus and their subsequent purification by FACS. Transcriptome analysis from slow cycling cells identified differentially expressed genes when comparing to GFP(-) faster-dividing cells...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28615632/genome-wide-analysis-suggests-a-differential-microrna-signature-associated-with-normal-and-diabetic-human-corneal-limbus
#5
Mangesh Kulkarni, Aleksandra Leszczynska, Gabbie Wei, Michael A Winkler, Jie Tang, Vincent A Funari, Nan Deng, Zhenqiu Liu, Vasu Punj, Sophie X Deng, Alexander V Ljubimov, Mehrnoosh Saghizadeh
Small non-coding RNAs, in particular microRNAs (miRNAs), regulate fine-tuning of gene expression and can impact a wide range of biological processes. However, their roles in normal and diseased limbal epithelial stem cells (LESC) remain unknown. Using deep sequencing analysis, we investigated miRNA expression profiles in central and limbal regions of normal and diabetic human corneas. We identified differentially expressed miRNAs in limbus vs. central cornea in normal and diabetic (DM) corneas including both type 1 (T1DM/IDDM) and type 2 (T2DM/NIDDM) diabetes...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614157/probable-donor-derived-cytomegalovirus-disease-after-keratolimbal-allograft-transplantation
#6
Albert Y Cheung, Amit Govil, Scott R Friedstrom, Edward J Holland
PURPOSE: To report a case of probable donor-derived cytomegalovirus (CMV) infection after keratolimbal allograft (KLAL) transplantation. METHODS: Observational case report. RESULTS: A 41-year-old man with a history of aniridic keratopathy and limbal stem cell deficiency underwent KLAL in his right eye. Preoperatively, he was negative for CMV IgG and IgM. Postoperatively, he was maintained on tacrolimus and mycophenolate mofetil for systemic immunosuppression; he was also on prophylactic valganciclovir (for CMV) and trimethoprim/sulfamethoxazole (for pneumocystis pneumonia) for 1 month...
June 13, 2017: Cornea
https://www.readbyqxmd.com/read/28605816/rat-limbal-niche-cells-prevent-epithelial-stem-progenitor-cells-from-differentiation-and-proliferation-by-inhibiting-notch-signaling-pathway-in-vitro
#7
Jing Li, Szu-Yu Chen, Xin-Yue Zhao, Ming-Chang Zhang, Hua-Tao Xie
No abstract text is available yet for this article.
June 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28605808/rat-limbal-niche-cells-prevent-epithelial-stem-progenitor-cells-from-differentiation-and-proliferation-by-inhibiting-notch-signaling-pathway-in-vitro
#8
Jing Li, Szu-Yu Chen, Xin-Yue Zhao, Ming-Chang Zhang, Hua-Tao Xie
Purpose: Limbal niche cells (LNCs) play a pivotal role in regulating limbal epithelial stem/progenitor cells (LESCs). This study aimed to investigate whether Notch signaling is involved in LNCs' regulation of LESCs. Methods: Rat limbus was digested by dispase and collagenase, respectively. Limbal niche cells were isolated by serial passage of collagenase-digested cells on coated Matrigel in a modified embryonic stem cell medium (MESCM). Dispase-isolated cells, with or without LNCs, were seeded on three-dimensional (3D) Matrigel...
June 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28586929/-keratoprosthesis-with-biological-haptic-the-d%C3%A3-sseldorf-offenburg-experience-with-osteo-odonto-and-tibia-keratoprosthesis
#9
Gerd Geerling, Konrad Hille
In severe ocular surface disease with limbal stem cell deficiency associated with severe dry eye, penetrating keratoplasty is likely to fail. In these cases, and provided the posterior segment is normal, keratoprosthesis surgery (KPro) can achieve visual rehabilitation. In KPros with an autologous biological haptic, a bone-tooth-complex (osteo-odonto-keratoprothesis, OOKPro) or a piece of tibial cortex (tibia-keratoprosthesis, TKPro) is used to carry a PMMA cylinder. This construct can successfully be implanted even in severely dry eyes and in those with autoimmune disease, in which other KPro designs frequently fail...
June 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28582373/ocular-surface-changes-after-sulfur-mustard-exposure-in-rabbits-monitored-by-impression-cytology
#10
Shlomit Dachir, Hila Gutman, Ariel Gore, Liat Cohen, Maayan Cohen, Adina Amir, Vered Horwitz, Tamar Kadar
PURPOSE: Ocular injuries after exposure to sulfur mustard (SM) are characterized by acute corneal erosion and inflammation of the anterior segment that may be followed by delayed corneal neovascularization and epithelial defects, associated with limbal stem cell deficiency in part of the exposed eyes. This study aimed to further clarify the mechanism of the late injury by monitoring SM-induced cytological alterations in the ocular surface, in relation to the clinical symptoms, using impression cytology (IC)...
June 2, 2017: Cornea
https://www.readbyqxmd.com/read/28575918/-expansion-and-transplantation-of-limbal-stem-cells-for-corneal-surface-regeneration
#11
Adrian Gericke, Joanna Wasielica-Poslednik, Marion Zimmermann, Aytan Musayeva
In humans, regeneration of the corneal epithelium is regulated by the stem cell reservoir of the limbus. After extensive limbal damage, e.g., by inflammation, thermal burn or chemical injury, limbal stem cell deficiency leading to vascularization and opacification of the cornea and resulting in vision loss, may develop. Several techniques of autologous and allogenic stem cell transplantation have been established. The limbus can be restored by transplantation of whole limbal grafts, small limbal biopsies or by ex vivo-expanded limbal cells...
June 2, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28567305/characterization-of-ex-vivo-expanded-oral-mucosal-epithelium-cells-on-acellular-porcine-corneal-stroma-for-ocular-surface-reconstruction
#12
Jia-Song Wang, Hua-Tao Xie, Ming-Chang Zhang
PURPOSE: To ex vivo expand oral mucosal epithelium cells (OMECs) on acellular porcine corneal stroma (APCS) without using feeder cells and serum and to compare the morphologic and phenotypic characteristics of cultured oral cells on APCS to those of cells on deluded human amniotic membrane (HAM). METHODS: SD rat oral mucosal biopsies were cultured on APCS and HAM. Reverse-transcription polymerase chain reaction (RT-PCR) and immunohistochemistry were used to analyze the characterization of stem cells and epithelial differentiation of the outgrowth products...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28559840/limbal-stem-cell-sparing-corneoscleroplasty-with-peripheral-intralamellar-tuck-a-new-surgical-technique-for-keratoglobus
#13
Elias Jarade, Rafic Antonios, Sylvain El-Khoury
PURPOSE: To describe the technique of limbal stem cell-sparing corneoscleroplasty for the management of advanced keratoglobus. METHODS: A patient with bilateral advanced keratoglobus, with best-corrected visual acuity of 20/400 in the right eye and 20/200 in the left eye, underwent limbal stem cell-sparing corneoscleroplasty of the right eye. Initially, a 360-degree limbal incision with 200-μm depth was created, followed by a sublimbal tunnel dissection into the sclera, in order to conserve stem cells...
January 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28559289/generating-minicorneal-organoids-from-human-induced-pluripotent-stem-cells
#14
Praveen Joseph Susaimanickam, Savitri Maddileti, Vinay Kumar, Sreedhar Rao Boyinpally, Ramavat Ravinder Naik, Milind N Naik, Geereddy Bhanuprakash Reddy, Virender Singh Sangwan, Indumathi Mariappan
Corneal epithelial stem cells residing within the annular limbal crypts regulate adult tissue homeostasis. Autologous limbal grafts and tissue engineered corneal epithelial cell sheets have been widely used in the treatment of various ocular surface defects. In case of bilateral limbal defects, pluripotent stem cell (PSC) derived corneal epithelial cells are now being explored as an alternative to allogeneic limbal grafts. We report here an efficient method to generate complex three dimensional corneal organoids from human PSCs...
May 30, 2017: Development
https://www.readbyqxmd.com/read/28550448/towards-xeno-free-cultures-of-human-limbal-stem-cells-for-ocular-surface-reconstruction
#15
Zala Lužnik, Claudia Breda, Vanessa Barbaro, Stefano Ferrari, Angelo Migliorati, Enzo Di Iorio, Barbara Ferrari, Carlo Griffoni, Andrea Grassetto, Hossein Mostafa Elbadawy, Marina Bertolin
Isolated limbal epithelial stem cells (LESCs) were cultured with or without a 3T3 murine fibroblast feeder-layer (FL) in 4 different culture media on culture plates or on denuded human amniotic membrane (AM) support and fibrin gel support: (1) control medium supplemented with fetal bovine serum; (2) control medium supplemented with the synthetic serum "XerumFree™ XF205" (XF); (3) CnT-20 medium supplemented with "XerumFree™ XF205" (CnT-XF) and (4) CnT-20 medium supplemented with human AB serum (CnT-AB). The three xenogeneic media were compared to standard condition (control + FL) and parameters assessed included cell morphology, proliferative potential, number of passages, assessment of clonogenic and abortive colonies, life span, ∆Np63α expression and epithelial morphology on AM...
May 26, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28544131/sclerocorneal-graft-and-sequential-removal-of-melted-cornea-after-severe-corneal-burn-with-perforation
#16
Anja Viestenz, Berthold Seitz, Hans-Gert Struck, Arne Viestenz
INTRODUCTION: Corneal burn grade IV usually leads to blindness. Several different surgical techniques remain challenging owing to the extensive tissue damage. Here, we introduce a novel technique with a 15 mm corneoscleral and limbal homologous graft combined with sequential autologous corneal removal ab interno, with a vitrectomy probe to save the anterior chamber angle. In vivo anatomy with optical coherence tomography is the surgical key. METHOD: A large 15 mm sclerocorneal graft is sutured on top of the remainder of the destroyed cornea and sclera after removal of the epithelium and conjunctiva, with anterior synechiolysis if necessary, peripheral iridectomy and conjunctivoplasty...
May 22, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28538612/scleral-contact-lenses-in-an-academic-oculoplastics-clinic-epidemiology-and-emerging-considerations
#17
Harinder S Chahal, Marcela Estrada, Christine W Sindt, Jacob A Boehme, Mark A Greiner, Jeffrey A Nerad, Keith D Carter, Richard C Allen, Erin M Shriver
PURPOSE: To describe the role and efficacy of scleral contact lenses (SCLs) in the treatment of progressive keratopathy in patients who have undergone periocular surgical procedures, to investigate the financial impact of these surgical interventions, and to demonstrate the role of oculoplastic surgery in improving scleral contact lens fit. METHODS: A retrospective medical record review was performed to identify patients who both received SCLs and were examined by the oculoplastics service at the University of Iowa between January 1990 and December 2015...
May 22, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28529022/effect-of-microgravity-on-the-mesenchymal-stem-cell-characteristics-of-limbal-fibroblasts
#18
Shu-I Pao, Ke-Hung Chien, Hsin-Ting Lin, Ming-Cheng Tai, Jiann-Torng Chen, Chang-Min Liang
BACKGROUND: Mesenchymal stem cells (MSCs) are important for regenerative medicine. Limbal fibroblasts (LFs), present in the corneal limbus, have been shown to possess MSC characteristics, and can differentiate into other cell types. The current study sought to investigate the effect of microgravity on the proliferation and differentiation of LFs, and identify culture conditions to obtain a high proportion of LFs possessing MSC characteristics. METHODS: A rotary cell culture system was used to generate microgravity...
May 18, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28528957/proteasomes-in-corneal-epithelial-cells-and-cultured-autologous-oral-mucosal-epithelial-cell-sheet-caomecs-graft-used-for-the-ocular-surface-regeneration
#19
Fawzia Bardag-Gorce, Richard Hoft, Imara Meepe, Julio Garcia, Kumar Tiger, Andrew Wood, Amanda Laporte, Derek Pan, Andrew Makalinao, Robert Niihara, Joan Oliva, Arjie Florentino, Amber M Gorce, Jeremy Stark, Daileen Cortez, Samuel W French, Yutaka Niihara
PURPOSE: This study focuses on characterizing proteasomes in corneal epithelial cells (CEC) and in cultured autologous oral mucosal epithelial cell sheets (CAOMECS) used to regenerate the ocular surface. METHODS: Limbal stem cell deficiency (LSCD) was surgically induced in rabbit corneas. CAOMECS was engineered and grafted onto corneas with LSCD to regenerate the ocular surface. RESULTS: LSCD caused an increase in inflammatory cells in the ocular surface, an increase in the formation of immunoproteasomes (IPR), and a decrease in the formation of constitutive proteasome (CPR)...
May 18, 2017: Ocular Surface
https://www.readbyqxmd.com/read/28510772/prevalence-incidence-and-risk-factors-for-the-development-of-glaucoma-in-patients-with-aniridia
#20
Shantha Balekudaru, Nandhini Sankaranarayanan, Sumita Agarkar
PURPOSE: To assess the prevalence, incidence, and risk factors for the development of glaucoma in patients with aniridia. METHODS: Retrospective analysis of case records of patients diagnosed as having congenital aniridia between January 1986 and December 2011 was performed. Patients with a follow-up of more than 12 months were included. RESULTS: Ninety-one patients (180 eyes) with the diagnosis of aniridia were identified from the case records...
May 15, 2017: Journal of Pediatric Ophthalmology and Strabismus
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