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Limbal stem cells

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https://www.readbyqxmd.com/read/29040119/prospective-clinical-trial-of-corneal-reconstruction-with-biomaterial-free-cultured-oral-mucosal-epithelial-cell-sheets
#1
Yu Jeong Kim, Hyun Ju Lee, Jin Suk Ryu, Yun Hee Kim, Saewha Jeon, Joo Youn Oh, Ho Kyung Choung, Sang In Khwarg, Won Ryang Wee, Mee Kum Kim
PURPOSE: To investigate the efficacy and safety of transplantation with biomaterial-free cultured oral mucosal epithelial cell sheets (COMECs) for ocular reconstruction in subjects with total limbal stem cell deficiency. METHODS: A prospective clinical trial (NCT02149732) was conducted in 8 subjects with total limbal stem cell deficiency after approval from the institutional review board of Seoul National University Hospital (H-0707-043-213) and the Ministry of Food and Drug Safety of Korea...
October 13, 2017: Cornea
https://www.readbyqxmd.com/read/29032107/long-term-outcomes-of-ocular-surface-stem-cell-allograft-transplantation
#2
Asadolah Movahedan, Albert Y Cheung, Medi Eslani, Gautham Mogilishetty, Amit Govil, Edward J Holland
PURPOSE: To investigate the long-term outcomes of ocular surface stem cell allograft transplantation (OSST) in patients with total limbal stem cell deficiency (LSCD) due to various etiologies with a follow-up ≥ 5 years. DESIGN: Retrospective interventional cohort. METHODS: ▪▪▪ SETTING: Single tertiary referral hospital. STUDY POPULATION: Patients who had (1) presence of total LSCD, (2) surgical treatment with at least one allograft OSST procedure, and (3) minimum follow-up ≥ 5 years after OSST...
October 12, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29020119/human-adipose-derived-stem-cells-support-the-growth-of-limbal-stem-progenitor-cells
#3
Hua Mei, Sheyla González, Martin N Nakatsu, Elfren R Baclagon, Felix V Chen, Sophie X Deng
The most efficient method to expand limbal stem cells (LSCs) in vitro for clinical transplantation is to culture single LSCs directly on growth-arrested mouse fibroblast 3T3 cells. To reduce possible xenobiotic contamination from 3T3s, primary human adipose-derived stem cells (ASCs) were examined as feeder cells to support the expansion of LSCs in vitro. To optimize the ASC-supported culture, freshly isolated limbal epithelial cells in the form of single cells (SC-ASC) or cell clusters (CC-ASC) were cultured using three different methods: LSCs seeded directly on feeder cells, a 3-dimensional (3D) culture system and a 3D culture system with fibrin (fibrin 3D)...
2017: PloS One
https://www.readbyqxmd.com/read/29017529/short-review-on-human-umbilical-cord-lining-epithelial-cells-and-their-potential-clinical-applications
#4
REVIEW
Razwa Saleh, Hasan Mahmud Reza
BACKGROUND: The human umbilical cord has been studied extensively in the past two decades. It is free of ethical dilemmas, non-tumorigenic, and less immunogenic and thus provides a significant advantage over other stem cell sources. The cord lining yields both mesenchymal and epithelial stem cells. The mesenchymal cells have been appraised at length by many researchers, which led to the current review focusing on the cord lining epithelial cells (CLECs). These cells have high proliferative capacity and their superior harvest and multiplication, using the revolutionary CellOptima(TM) technology, makes them better candidates in comparison to contemporary adult stem cells...
October 10, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28966853/in-vivo-imaging-of-the-palisades-of-vogt-and-the-limbal-crypts-with-sub-micrometer-axial-resolution-optical-coherence-tomography
#5
Kostadinka Bizheva, Bingyao Tan, Benjamin MacLellan, Zohreh Hosseinaee, Erik Mason, Denise Hileeto, Luigina Sorbara
A research-grade OCT system was used to image in-vivo and without contact with the tissue, the cellular structure and microvasculature of the healthy human corneo-scleral limbus. The OCT system provided 0.95 µm axial and 4 µm (2 µm) lateral resolution in biological tissue depending on the magnification of the imaging objective. Cross-sectional OCT images acquired tangentially from the inferior limbus showed reflective, loop-like features that correspond to the fibrous folds of the palisades of Vogt (POV)...
September 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28959505/update-on-the-management-of-high-risk-penetrating-keratoplasty
#6
Sayena Jabbehdari, Alireza Baradaran Rafii, Ghasem Yazdanpanah, Pedram Hamrah, Edward J Holland, Ali R Djalilian
PURPOSE OF REVIEW: In this article, we review the indications and latest management of high-risk penetrating keratoplasty. RECENT FINDINGS: Despite the immune-privilege status of the cornea, immune-mediated graft rejection still remains the leading cause of corneal graft failure. This is particularly a problem in the high-risk graft recipients, namely patients with previous graft failure due to rejection and those with inflamed and vascularized corneal beds. A number of strategies including both local and systemic immunosuppression are currently used to increase the success rate of high-risk corneal grafts...
March 2017: Current Ophthalmology Reports
https://www.readbyqxmd.com/read/28957444/optimizing-the-role-of-limbal-explant-size-and-source-in-determining-the-outcomes-of-limbal-transplantation-an-in-vitro-study
#7
Abhinav Reddy Kethiri, Sayan Basu, Sachin Shukla, Virender Singh Sangwan, Vivek Singh
PURPOSE: Simple limbal epithelial transplantation (SLET) and cultivated limbal epithelial transplantation (CLET) are proven clinical techniques for treating limbal stem cell deficiency (LSCD). However, the ideal size and number of the limbal explants required for transplantation has not been clearly elucidated. This in vitro study aimed to determine the optimal limbal explant size required for complete corneal epithelialization by characterizing the cell expansion. METHODS: Limbal explants obtained from both live and cadaveric biopsies were cultured on the denuded amniotic membrane...
2017: PloS One
https://www.readbyqxmd.com/read/28954032/a-supramolecular-look-at-microenvironmental-regulation-of-limbal-epithelial-stem-cells-and-the-differentiation-of-their-progeny
#8
Marcela Aldrovani, Marcella Rosa Filezio, José Luiz Laus
Various approaches have been taken to improve our knowledge of the microenvironmental regulation of limbal epithelial stem cells. Researchers have extensively investigated the roles of growth factors, survival factors, cytokines, enzymes, and permeable molecules secreted by the limbal cells. However, recent evidence suggests that stem cell fate (i.e., self-renewal or differentiation) can also be influenced by biophysical and mechanical cues related to the supramolecular organization and the liquid crystalline (mesophase) nature of the stromal extracellular matrix...
July 2017: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/28943255/keratin-14-positive-precursor-cells-spawn-a-population-of-migratory-corneal-epithelia-that-maintain-tissue-mass-throughout-life
#9
Alexander Richardson, Erwin P Lobo, Naomi C Delic, Mary R Myerscough, J Guy Lyons, Denis Wakefield, Nick Di Girolamo
The dynamics of epithelial stem cells (SCs) that contribute to the formation and maintenance of the cornea are poorly understood. Here, we used K14CreER(T2)-Confetti (Confetti) mice, sophisticated imaging, and computational modeling to trace the origins and fate of these cells during embryogenesis and adult life. We show that keratin-14 (K14(+))-expressing progenitors are defined and widely distributed across the E16.5 cornea, after which they undergo cycles of proliferation and dispersal prior to eyelid opening...
October 10, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28926502/limbal-cysts-a-subset-exhibiting-cornea-specific-cytokeratins
#10
Norman C Charles, Frederick A Jakobiec, Fouad R Zakka, Ilyse D Haberman, Kishore Reddy Katikireddy, Ula V Jurkunas
Two cases of limbal cysts lined by nonkeratinizing epithelium were studied with a panel of cytokeratins. One was a long-standing lesion in a 30-year-old man, whereas the other was excised from a 40-year-old man following pterygium surgery. Each cyst was immunostained with a panel of cytokeratins that were specific exclusively and separately for corneal and conjunctival epithelia. The epithelial lining of each cyst was CK12 positive for corneal epithelium and CK13 negative for conjunctival epithelium. It is hypothesized that a subset of corneoscleral cysts contain corneal epithelium, probably derived from a type of limbal stem cell differentiation...
September 13, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28922332/evaluation-of-corneal-neovascularization-using-optical-coherence-tomography-angiography-in-patients-with-limbal-stem-cell-deficiency
#11
Yoshinori Oie, Kohji Nishida
PURPOSE: Detection of the exact area of corneal neovascularization using slit-lamp photography is often difficult. Thus, we evaluated corneal neovascularization in patients with limbal stem cell deficiency using optical coherence tomography angiography (OCTA). METHODS: Five patients with 5 eyes showing partial or total limbal stem cell deficiency were enrolled. Three eyes had severe corneal scarring. Five 6- × 6-mm images (frontal, upper, lower, nasal, and temporal) were obtained by OCTA...
November 2017: Cornea
https://www.readbyqxmd.com/read/28906020/diagnostic-impact-of-anterior-segment-angiography-of-limbal-stem-cell-insufficiency-in-pax6-related-aniridia
#12
Barbara Käsmann-Kellner, Lorenz Latta, Fabian Fries, Arne Viestenz, Berthold Seitz
BACKGROUND: PAX6 is a master gene of ocular development and postnatal ocular equilibrium. Congenital aniridia is the hallmark of PAX6 gene haploinsufficiency (Chr. 11 p. 13), but PAX6-associated aniridia is a profound, progressive pan-ocular developmental disorder often leading to blindness. Limbal stem cell insufficiency and corneal findings in PAX6 syndrome: There is congenital visual impairment with advancing loss of vision mainly due to secondary glaucoma and to corneal blindness caused by limbal stem cell insufficiency (LSCI)...
September 14, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28898916/-rehabilitation-following-limbal-stem-cell-deficiency-current-treatment-options-and-future-developments
#13
Henning Thomasen, Klaus P Steuhl, Daniel Meller
Limbal stem cell deficiency (LSCD) is a condition caused by the loss of corneal epithelial regenerative potential. The treatment of this condition is still a challenge. It results from various conditions both intrinsic as well as extrinsic. LSCD can be either uni- or bilateral and either partial or total. Today treatment options include a variety of techniques including transplantation of amniotic membrane and limbal tissue or tissue engineered cell sheets. This article summarizes the current techniques to treat LSCD and upcoming developments...
September 12, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28894469/ex-vivo-expansion-of-human-limbal-epithelial-cells-using-human-placenta-derived-and-umbilical-cord-derived-mesenchymal-stem-cells
#14
Sang Min Nam, Yong-Sun Maeng, Eung Kweon Kim, Kyoung Yul Seo, Helen Lew
Ex vivo culture of human limbal epithelial cells (LECs) is used to treat limbal stem cell (LSC) deficiency, a vision loss condition, and suitable culture systems using feeder cells or serum without animal elements have been developed. This study evaluated the use of human umbilical cord or placenta mesenchymal stem cells (C-MSCs or P-MSCs, resp.) as feeder cells in an animal/serum-free coculture system with human LECs. C-/P-MSCs stimulated LEC colony formation of the stem cell markers (p63, ABCG2) and secreted known LEC clonal growth factors (keratinocyte growth factor, β-nerve growth factor)...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28878217/in-vivo-confocal-microscopy-evaluation-of-ocular-surface-with-graft-versus-host-disease-related-dry-eye-disease
#15
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/28863216/hyaluronan-rich-microenvironment-in-the-limbal-stem-cell-niche-regulates-limbal-stem-cell-differentiation
#16
Tarsis F Gesteira, Mingxia Sun, Yvette M Coulson-Thomas, Yu Yamaguchi, Lung-Kun Yeh, Vincent Hascall, Vivien J Coulson-Thomas
Purpose: Limbal epithelial stem cells (LSCs), located in the basal layer of the corneal epithelium in the corneal limbus, are vital for maintaining the corneal epithelium. LSCs have a high capacity of self-renewal with increased potential for error-free proliferation and poor differentiation. To date, limited research has focused on unveiling the composition of the limbal stem cell niche, and, more important, on the role the specific stem cell niche may have in LSC differentiation and function...
September 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28860936/stem-cells-in-regenerative-medicine-from-laboratory-to-clinical-application-the-eye
#17
REVIEW
Anna M Dąbrowska, Piotr Skopiński
Stem cells are currently one of the most researched and explored subject in science. They consstitue a very promising part of regenerative medicine and have many potential clinical applications. Harnessing their ability to replicate and differentiate into many cell types can enable successful treatment of diseases that were incurable until now. There are numerous types of stem cells (e.g. ESCs, FSCs, ASCs, iPSCs) and many different methods of deriving and cultivating them in order to obtain viable material...
2017: Central-European Journal of Immunology
https://www.readbyqxmd.com/read/28855664/oral-mucosal-epithelial-cells-grown-on-porous-silicon-membrane-for-transfer-to-the-rat-eye
#18
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/28844373/blood-derived-eye-drops-for-the-treatment-of-cornea-and-ocular-surface-diseases
#19
REVIEW
Giuseppe Giannaccare, Piera Versura, Marina Buzzi, Laura Primavera, Marco Pellegrini, Emilio C Campos
The use of blood derived eye drops for the treatment of ocular surface disorders has become increasingly popular in recent years. The mechanism of action is the stimulation of cellular proliferation and migration by supplying an active mixture of growth factors and cytokines at the ocular surface, thus mimicking the function of the lacking natural tears. Blood derived eye drops have been used in the last decades for the treatment of a variety of ocular surface diseases, including mainly dry eye disease, persistent corneal epithelial defect, corneal ulcer, ocular surface burn, recurrent corneal erosion and limbal stem-cell deficiency...
August 8, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28834816/donor-derived-conjunctival-limbal-melanoma-after-a-keratolimbal-allograft
#20
Lorena Sepsakos, Albert Y Cheung, Jeffrey A Nerad, Gautham Mogilishetty, Edward J Holland
PURPOSE: To report a single case of donor-derived conjunctival-limbal melanoma that occurred after a keratolimbal allograft (KLAL). METHODS: Case report and literature review. RESULTS: A 56-year-old white woman with a history of bilateral limbal stem cell deficiency developed a donor-related melanoma after a KLAL. Three months after undergoing an uncomplicated KLAL, the patient presented with hemorrhagic nodules within her conjunctiva and transplanted tissue...
August 22, 2017: Cornea
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