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Limbal stem cell

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https://www.readbyqxmd.com/read/29320729/corneal-committed-cells-restore-the-stem-cell-pool-and-tissue-boundary-following-injury
#1
Waseem Nasser, Aya Amitai-Lange, Despina Soteriou, Rana Hanna, Beatrice Tiosano, Yaron Fuchs, Ruby Shalom-Feuerstein
During morphogenesis, preserving tissue boundaries is essential for cell fate regulation. While embryonic tissues possess high plasticity and repair ability, the questions of whether and how adult tissues cope with acute stem cell (SC) loss or boundary disruption have remained unanswered. Here, we report that K15-GFP transgene labels the murine corneal epithelial boundary and SC niche known as the limbus. K15-GFP+ basal cells expressed SC markers and were located at the corneal regeneration site, as evident by lineage tracing...
January 9, 2018: Cell Reports
https://www.readbyqxmd.com/read/29296553/effect-of-air-lifting-on-the-stemness-junctional-protein-formation-and-cytokeratin-expression-of-in-vitro-cultivated-limbal-epithelial-cell-sheets
#2
Lily Wei Chen, Yan-Ming Chen, Chia-Ju Lu, Mei-Yun Chen, Szu-Yuan Lin, Fung-Rong Hu, Wei-Li Chen
PURPOSE: The aim of this study is to evaluate the effects of air-lifting on the stemness, junctional protein formation, and cytokeratin expression of rabbit limbal stem cells cultivated in vitro, and to find out the proper timing of air-lifting before transplantation as limbal epithelial cell sheets for the treatment of limbal insufficiency. MATERIALS AND METHODS: Limbal epithelial cells were isolated from the limbus of New Zealand white rabbits and cultivated in vitro...
October 2017: Taiwan Journal of Ophthalmology
https://www.readbyqxmd.com/read/29284513/xeno-and-feeder-free-differentiation-of-human-pluripotent-stem-cells-to-two-distinct-ocular-epithelial-cell-types-using-simple-modifications-of-one-method
#3
Heidi Hongisto, Tanja Ilmarinen, Meri Vattulainen, Alexandra Mikhailova, Heli Skottman
BACKGROUND: Human pluripotent stem cells (hPSCs) provide a promising cell source for ocular cell replacement therapy, but often lack standardized and xenogeneic-free culture and differentiation protocols. We aimed to develop a xeno- and feeder cell-free culture system for undifferentiated hPSCs along with efficient methods to derive ocular therapy target cells: retinal pigment epithelial (RPE) cells and corneal limbal epithelial stem cells (LESCs). METHODS: Multiple genetically distinct hPSC lines were adapted to a defined, xeno-, and feeder-free culture system of Essential 8™ medium and laminin-521 matrix...
December 29, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29283122/results-of-simple-limbal-epithelial-transplantation-in-unilateral-ocular-surface-burn
#4
Nidhi Gupta, Jagdish Joshi, Javed Hussain Farooqui, Umang Mathur
PURPOSE: This study aimed to report the long-term outcomes of autologous Simple Limbal Epithelial Transplantation (SLET) performed for unilateral limbal stem cell deficiency (LSCD) following chemical burn at a tertiary eye center in North India. METHODS: This was a single-center prospective interventional case series of patients who developed unilateral LSCD after suffering from ocular surface burns and who underwent SLET between October 2012 and May 2016 with a follow-up period of at least 6 months...
January 2018: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29246889/nerve-terminals-at-the-human-corneoscleral-limbus
#5
Mouhamed A Al-Aqaba, Fady S Anis, Imran Mohammed, Harminder S Dua
AIMS: To demonstrate and characterise distinct subepithelial compact nerve endings (CNE) at the human corneoscleral limbus. METHODS: Ten fresh human donor corneoscleral discs (mean age, 67 years) and 26 organ-cultured corneoscleral rims (mean age, 59 years) were studied. All samples were subjected to enzyme histochemical staining related to endogenous acetylcholinesterase present in nerve tissue and H&E staining. Whole-mount en face imaging with NanoZoomer digital pathology microscope and serial cross-section imaging with light microscope were undertaken...
December 15, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29238604/novel-pax6-mutation-reported-in-an-aniridia-patient
#6
Andrew Winegarner, Yoshinori Oie, Satoshi Kawasaki, Nozomi Nishida, Kohji Nishida
An aniridia patient was found to have a novel PAX6 mutation. A genetic duplication within PAX6, which caused a frameshift mutation, ultimately created a nonsense stop codon and premature truncation of the protein. Consequently, the patient presented with a clouded cornea as a result of partial limbal stem cell deficiency, foveal hypoplasia, nystagmus and a pale, cupped optic disc caused by glaucoma.
2017: Human Genome Variation
https://www.readbyqxmd.com/read/29230251/establishment-of-novel-limbus-derived-highly-proliferative-abcg2-abcb5-limbal-epithelial-stem-cell-cultures
#7
Eung Kweon Kim, Ga-Hyun Lee, Boram Lee, Yong-Sun Maeng
Homeostasis and regeneration of corneal epithelia are sustained by limbal epithelial stem cells (LESCs); thus, an LESC deficiency is a major cause of blindness worldwide. Despite the generally promising results of cultivated LESC transplantation, it has been limited by variations in long-term success rates, the use of xenogeneic and undefined culture components, and a scarcity of donor tissues. In this study, we identified the culture conditions required to expand LESCs in vitro and established human limbus-derived highly proliferative ABCG2+/ABCB5+ double-positive LESCs...
2017: Stem Cells International
https://www.readbyqxmd.com/read/29226476/differences-in-the-activity-of-endogenous-bmp-signalling-impact-on-the-ability-of-induced-pluripotent-stem-cells-to-differentiate-to-corneal-epithelial-like-cells
#8
Taty Anna Kamarudin, Sanja Bojic, Joseph Collin, Min Yu, Sameer Alharthi, Harley Buck, Alex Shortt, Lyle Armstrong, Francisco C Figueiredo, Majlinda Lako
Cornea is a clear outermost layer of the eye which enables transmission of light onto the retina. The transparent corneal epithelium is regenerated by limbal stem cells (LSCs), whose loss/dysfunction results in limbal stem cell deficiency (LSCD). Ex vivo expansion of autologous LSCs obtained from patient's healthy eye followed by transplantation onto the LSCs damaged/deficient eye, has provided a successful treatment for unilateral LSCD. This however is not applicable to patient with total bilateral LSCD, where LSCs are lost/damaged from both eyes...
December 11, 2017: Stem Cells
https://www.readbyqxmd.com/read/29217022/focal-limbal-stem-cell-deficiency-associated-with-soft-contact-lens-wear
#9
Karolien Termote, Steven Schendel, Gregory Moloney, Simon P Holland, Alex P Lange
OBJECTIVE: The aim of this study is to summarize the clinical characteristics of patients with contact lens-associated focal limbal stem cell deficiency (FLSCD) from a tertiary corneal referral centre. DESIGN: Retrospective, observational case series in a tertiary care centre. METHODS: Patients with contact lens-associated FLCSD were identified in our database. Clinical data were retrieved by chart review. A questionnaire asking for contact lens brand, type, cleaning solution, and duration of contact lens wear was sent to the patients with telephone follow-up...
December 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/29210839/cataract-surgery-in-ocular-surface-diseases-clinical-challenges-and-outcomes
#10
REVIEW
Virender S Sangwan, Swati Gupta, Shilpa Das
PURPOSE OF REVIEW: Cataracts are a significant cause of blindness and visual impairment worldwide. With the recent advances in cataract surgery techniques, outcomes have improved significantly in uncomplicated cases. This article discusses the challenges and outcomes of cataract surgery in complex cases targeting eyes with ocular surface diseases like Stevens-Johnson syndrome, ocular cicatricial pemphigoid, Mooren's ulcer, vernal keratoconjunctivitis and limbal stem cell deficiency. RECENT FINDINGS: Ocular surface diseases are commonly associated with corneal scarring and vascularization, conjunctival inflammation, symblepharon and forniceal shortening...
January 2018: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29208552/controlling-human-corneal-stromal-stem-cell-contraction-to-mediate-rapid-cell-and-matrix-organization-of-real-architecture-for-3-dimensional-tissue-equivalents
#11
Dev Mukhey, James Phillips, Julie T Daniels, Alvena K Kureshi
The architecture of the human corneal stroma consists of a highly organized extracellular matrix (ECM) interspersed with keratocytes. Their progenitor cells; corneal stromal stem cells (CSSC) are located at the periphery, in the limbal stroma. A highly organized corneal ECM is critical for effective transmission of light but this structure may be compromised during injury or disease, resulting in loss of vision. Re-creating normal organization in engineered tissue equivalents for transplantation often involves lengthy culture times that are inappropriate for clinical use or utilisation of synthetic substrates that bring complications such as corneal melting...
December 2, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29204944/comparison-of-culture-media-indicates-a-role-for-autologous-serum-in-enhancing-phenotypic-preservation-of-rabbit-limbal-stem-cells-in-explant-culture
#12
Mehmet Gürdal, Özlem Barut Selver, Kemal Baysal, İsmet Durak
In this study, we aimed to compare the effects of six different cell culture media and autologous serum (AS) on the phenotypic characteristics of rabbit limbal epithelial stem cells (LESC) cultivated on porous polyethylene terephthalate (PET) membranes. Limbal explants from rabbit corneas were grown on PET membrane inserts in five different media: DMEM-F12 with fetal bovine serum (FBS) (DMEM-F12-FBS), with pluripotin (DMEM-F12-pluripotin) and with autologous serum (DMEM-F12-AS), Epilife, Keratinocyte Serum Free Medium (KSFM) and Defined-Keratinocyte Serum Free Medium...
December 4, 2017: Cytotechnology
https://www.readbyqxmd.com/read/29198663/determination-of-the-culture-time-point-to-induce-corneal-epithelial-differentiation-in-induced-pluripotent-stem-cells
#13
R A Martínez García de la Torre, N Nieto-Nicolau, A Morales-Pastor, R P Casaroli-Marano
BACKGROUND: Limbal stem cells (LSC) are progenitor cells in the ocular surface that renew the corneal epithelium. Limbal stem cell deficiency usually induces blindness through the loss of corneal transparency, and bilateral cases do not an accurate treatment because of the lack of an autologous source of stem cells. METHODS: Induced pluripotent stem cells (iPSC) are promising for use in cell therapy because of their autologous origin and the capability to differentiate into corneal epithelial cells...
December 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/29172876/limbal-stem-cell-transplantation-and-complications
#14
Jia Yin, Ula Jurkunas
Corneal epithelial stem cells are adult somatic stem cells located at the limbus and represent the ultimate source of transparent corneal epithelium. When these limbal stem cells become dysfunctional or deficient, limbal stem cell deficiency (LSCD) develops. LSCD is a major cause of corneal scarring and is particularly prevalent in chemical and thermal burns of the ocular surface. LSCD leads to conjunctivalization of the corneal surface, neovascularization, recurrent or persistent epithelial defects, ocular surface inflammation, and scarring that, in turn, lead to decreased vision, pain, and impaired quality of life...
November 27, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/29164231/storage-of-porcine-cornea-in-an-innovative-bioreactor
#15
Damien Guindolet, Emmanuel Crouzet, Zhiguo He, Pascal Herbepin, Clotilde Jumelle, Chantal Perrache, Jean Marc Dumollard, Fabien Forest, Michel Peoc'h, Philippe Gain, Eric Gabison, Gilles Thuret
Purpose: To quantify cell survival and tissue structure preservation of porcine cornea stored in a bioreactor (BR) that recreates a transcorneal pressure gradient equivalent to intraocular pressure (IOP) and renews the medium. Methods: A BR comprising endothelial and epithelial chambers was machined in a biocompatible material. The porcine cornea, securely held, separated the chambers. Medium flow and pressure inside the endothelial chamber were maintained by a peristaltic pump...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29162348/human-aniridia-limbal-epithelial-cells-lack-expression-of-keratins-k3-and-k12
#16
Lorenz Latta, Arne Viestenz, Tanja Stachon, Sarah Colanesi, Nóra Szentmáry, Berthold Seitz, Barbara Käsmann-Kellner
Patients with aniridia often develop aniridia-related keratopathy (ARK), due to limbal stem cell insufficiency. This study aimed to determine the proliferative capacity and differentiation status of limbal epithelial cells (LECs) in patients with ARK. We also investigated the influences of PAX6 genotype on PAX6-transcript and protein level. Here two patients with aniridia underwent keratoplasty were examined. During the surgery, small limbal biopsies and pannus tissue were excised and processed for cell culture...
November 18, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/29149196/easy-xeno-free-and-feeder-free-method-for-isolating-and-growing-limbal-stromal-and-epithelial-stem-cells-of-the-human-cornea
#17
Djida Ghoubay-Benallaoua, Céline de Sousa, Raphaël Martos, Gaël Latour, Marie-Claire Schanne-Klein, Elisabeth Dupin, Vincent Borderie
Epithelial and stromal stem cells are required to maintain corneal transparency. The aim of the study was to develop a new method to isolate and grow both corneal stromal (SSC) and epithelial limbal (LSC) stem cells from small human limbal biopsies under culture conditions in accordance with safety requirements mandatory for clinical use in humans. Superficial limbal explants were retrieved from human donor corneo-scleral rims. Human limbal cells were dissociated by digestion with collagenase A, either after epithelial scraping or with no scraping...
2017: PloS One
https://www.readbyqxmd.com/read/29141906/keratolimbal-allograft-for-limbal-stem-cell-deficiency-after-severe-corneal-chemical-injury-a-systematic-review
#18
Swapna S Shanbhag, Hajirah N Saeed, Eleftherios I Paschalis, James Chodosh
PURPOSE: To review the published literature on outcomes of keratolimbal allograft (KLAL) for the surgical treatment of limbal stem cell deficiency (LSCD) and corneal blindness after severe corneal chemical injury. METHODS: Literature searches were conducted in the following electronic databases: MEDLINE, EMBASE, Science Citation Index, CINAHL, LILACS and the Cochrane Library. Standard systematic review methodology was applied. The main outcome measure was the proportion of eyes with best-corrected visual acuity (BCVA) ≥20/200 at last follow-up...
November 15, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29135712/limbal-stem-cell-preservation-during-proton-beam-irradiation-for-diffuse-iris-melanoma
#19
Paul T Finger, Wolfgang A G Sauerwein
No abstract text is available yet for this article.
November 13, 2017: Cornea
https://www.readbyqxmd.com/read/29133636/diagnosis-of-limbal-stem-cell-deficiency-based-on-corneal-epithelial-thickness-measured-on-anterior-segment-optical-coherence-tomography
#20
COMPARATIVE STUDY
Amit Mehtani, Mahesh Chandra Agarwal, Sushant Sharma, Santosh Chaudhary
PURPOSE: The purpose of this study is to investigate the epithelial thickness in the cornea and limbus in limbal stem cell deficiency (LSCD) using anterior segment optical coherence tomography (AS-OCT). METHODS: This was a cross-sectional, comparative study. OCT images of 30 eyes of 19 patients with LSCD collected by AS-OCT were scanned. Corneal epithelial thickness was recorded at the central cornea and the superior, nasal, inferior, and temporal limbus. Measurment of the same region of 30 normal eyes served as control...
November 2017: Indian Journal of Ophthalmology
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