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https://www.readbyqxmd.com/read/29107055/native-and-synthetic-scaffolds-for-limbal-epithelial-stem-cell-transplantation
#1
REVIEW
Kim N Nguyen, Samantha Bobba, Alexander Richardson, Mijeong Park, Stephanie L Watson, Denis Wakefield, Nick Di Girolamo
Limbal stem cell deficiency (LSCD) is a complex blinding disease of the cornea, which cannot be treated with conventional corneal transplants. Instead, a stem cell (SC) graft is required to replenish the limbal epithelial stem cell (LESC) reservoir, which is ultimately responsible for regenerating the corneal epithelium. Current therapies utilize limbal tissue biopsies that harbor LESCs as well as tissue culture expanded cells. Typically, this tissue is placed on a scaffold that supports the formation of corneal epithelial cell sheets, which are then transferred to diseased eyes...
October 26, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29104630/electrospun-collagen-poly-l-lactic-acid-co-%C3%AE%C2%B5-caprolactone-scaffolds-for-conjunctival-tissue-engineering
#2
Qinke Yao, Weijie Zhang, Yang Hu, Junzhao Chen, Chunyi Shao, Xianqun Fan, Yao Fu
Conjunctival injuries are general but intractable ocular surface diseases, the sequelae of which are particularly challenging to treat. A promising therapy for conjunctival injuries is to employ biodegradable scaffolds to deliver conjunctival epithelial cells for repairing damaged or diseased conjunctiva. In the present study, an ultrathin porous nanofibrous scaffold was fabricated by using collagen and poly(L-lactic acid-co-ε-caprolactone) (PLCL) and displayed a thickness of 20 µm, with a high porosity and an average fiber diameter of 248...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29047302/a-self-assembled-clavanin-a-coated-amniotic-membrane-scaffold-for-the-prevention-of-biofilm-formation-by-ocular-surface-fungal-pathogens
#3
Santi M Mandal, Jahangir Khan, Denial Mahata, Suman Saha, Jayangshu Sengupta, Osmar N Silva, Subhayan Das, Mahitosh Mandal, Octavio L Franco
Amniotic membrane (AM) is frequently used in ophthalmologic surgery for rapid ocular surface reconstruction. Sometimes it may create a major problem with associated infections after biofilm formation over the membrane. To overcome this problem, AM was coated with the antimicrobial peptide clavanin A. The antifungal activity of clavanin A in the native and self-assembled form was determined against the common ocular surface pathogens Candida albicans, Aspergillus fumigatus, Alternaria sp. and Fusarium sp. Biofilm formation over the coated surface was significantly reduced in comparison with the uncoated membrane...
October 19, 2017: Biofouling
https://www.readbyqxmd.com/read/28923362/human-retinal-endothelial-cells-and-astrocytes-cultured-on-3-d-scaffolds-for-ocular-drug-discovery-and-development
#4
Kay D Beharry, Charles L Cai, Gloria B Valencia, Douglas Lazzaro, Arwin M Valencia, Fabrizio Salomone, Jacob V Aranda
Topical ocular ketorolac improves the outcomes of severe retinopathy of prematurity and when administered with systemic caffeine, decreases the severity of oxygen-induced retinopathy. We tested the hypothesis that co-cultures of human retinal endothelial cells (HRECs) and human retinal astrocytes (HRAs) on 3-dimensional (3-D) hydrogel scaffolds is a more representative biomimetic paradigm of the blood-retinal-barrier (BRB) than 2-D cultures, and should be utilized for preclinical drug discovery and development...
September 18, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28855664/oral-mucosal-epithelial-cells-grown-on-porous-silicon-membrane-for-transfer-to-the-rat-eye
#5
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/28799757/immobilization-of-growth-factors-to-collagen-surfaces-using-pulsed-visible-light
#6
Gabriella M Fernandes-Cunha, Hyun Jong Lee, Alisha Kumar, Alexander Kreymerman, Sarah Heilshorn, David Myung
In the treatment of traumatic injuries, burns, and ulcers of the eye, inadequate epithelial tissue healing remains a major challenge. Wound healing is a complex process involving the temporal and spatial interplay between cells and their extracellular milieu. It can be impaired by a variety of causes including infection, poor circulation, loss of critical cells, and/or proteins, and a deficiency in normal neural signaling (e.g., neurotrophic ulcers). Ocular anatomy is particularly vulnerable to lasting morbidity from delayed healing, whether it be scarring or perforation of the cornea, destruction of the conjunctival mucous membrane, or cicatricial changes to the eyelids and surrounding skin...
September 1, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28763630/growth-of-hollow-cell-spheroids-in-microbead-templated-chambers
#7
Eddie Wang, Dong Wang, Andrew Geng, Richard Seo, Xiaohua Gong
Cells form hollow, spheroidal structures during the development of many tissues, including the ocular lens, inner ear, and many glands. Therefore, techniques for in vitro formation of hollow spheroids are valued for studying developmental and disease processes. Current in vitro methods require cells to self-organize into hollow morphologies; we explored an alternative strategy based on cell growth in predefined, spherical scaffolds. Our method uses sacrificial, gelatin microbeads to simultaneously template spherical chambers within a hydrogel and deliver cells into the chambers...
July 26, 2017: Biomaterials
https://www.readbyqxmd.com/read/28698551/laminin-511-and-521-based-matrices-for-efficient-ex-vivo-expansion-of-human-limbal-epithelial-progenitor-cells
#8
Naresh Polisetti, Lydia Sorokin, Naoki Okumura, Noriko Koizumi, Shigeru Kinoshita, Friedrich E Kruse, Ursula Schlötzer-Schrehardt
Optimization of culture conditions for human limbal epithelial stem/progenitor cells (LEPC) that incorporate the in vivo cell-matrix interactions are essential to enhance LEPC ex vivo-expansion and transplantation efficiency. Here, we investigate the efficacy of laminin (LN) isoforms preferentially expressed in the limbal niche as culture matrices for epithelial tissue engineering. Analyses of expression patterns of LN chains in the human limbal niche provided evidence for enrichment of LN-α2, -α3, -α5, -β1, -β2, -β3, -γ1, -γ2 and -γ3 chains in the limbal basement membrane, with LN-α5 representing a signature component specifically produced by epithelial progenitor cells...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28573367/3d-microfabricated-scaffolds-and-microfluidic-devices-for-ocular-surface-replacement-a-review
#9
Elisabetta Prina, Pritesh Mistry, Laura E Sidney, Jing Yang, Ricky D Wildman, Marina Bertolin, Claudia Breda, Barbara Ferrari, Vanessa Barbaro, Andrew Hopkinson, Harminder S Dua, Stefano Ferrari, Felicity R A J Rose
In recent years, there has been increased research interest in generating corneal substitutes, either for use in the clinic or as in vitro corneal models. The advancement of 3D microfabrication technologies has allowed the reconstruction of the native microarchitecture that controls epithelial cell adhesion, migration and differentiation. In addition, such technology has allowed the inclusion of a dynamic fluid flow that better mimics the physiology of the native cornea. We review the latest innovative products in development in this field, from 3D microfabricated hydrogels to microfluidic devices...
June 2017: Stem Cell Reviews
https://www.readbyqxmd.com/read/28248962/an-engineered-human-conjunctival-like-tissue-to-study-ocular-surface-inflammatory-diseases
#10
Laura García-Posadas, Laura Soriano-Romaní, Antonio López-García, Yolanda Diebold
The aim of this study was to develop a three-dimensional model of the human conjunctiva that can be used to perform physiology and pathophysiology experiments. Fibrin-based matrices (derived from human plasma or plasma cryoprecipitate) were used as scaffolds, and primary cells were obtained from conjunctival tissue. Conjunctival constructs were analyzed by immunofluorescent staining and scanning electron microscopy and cell proliferation was measured with alamarBlue® assay. After characterizing the constructs, four different experimental conditions were analyzed in cryoprecipitate matrices: controls, air-lifted cultures (to increase cell stratification), partially desiccated cultures (to mimic dry eye disease), and IL-13-treated cultures (to mimic allergy)...
2017: PloS One
https://www.readbyqxmd.com/read/28243750/-the-emerging-technology-of-tissue-engineering-focus-on-stem-cell-niche
#11
U Schlötzer-Schrehardt, U Freudenberg, F E Kruse
Limbal stem cells reside in a highly specialized complex microenvironment that is known as the stem cell niche, an anatomically protected region at the bottom of the Palisades of Vogt, where the stem cells are located and where their quiescence, proliferation and differentiation are maintained in balance. Besides the epithelial stem and progenitor cell clusters, the limbal niche comprises several types of supporting niche cells and a specific extracellular matrix mediating biochemical and biophysical signals...
April 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/27747098/a-novel-technique-for-conjunctivoplasty-in-a-rabbit-model-platelet-rich-fibrin-membrane-grafting
#12
Mehmet Erol Can, Hasan Basri Çakmak, Gamze Dereli Can, Hatice Ünverdi, Yasin Toklu, Sema Hücemenoğlu
Purpose. To investigate the effect of platelet-rich fibrin (PRF) membrane on wound healing. Methods. Twenty-four right eyes of 24 New Zealand rabbits equally divided into 2 groups for the study design. After the creation of 5 × 5 mm conjunctival damage, it was secured with PRF membrane, which was generated from the rabbit's whole blood samples in PRF membrane group, whereas damage was left unsutured in the control group. Three animals were sacrificed in each group on the 1st, 3rd, 7th, and 28th postoperative days...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27041281/-perspectives-of-the-cell-therapy-in-ophthalmology1-the-application-of-stem-cells-in-the-regeneration-of-damaged-surface-of-the-eye
#13
E Javorková, V Holáň
UNLABELLED: Regeneration of corneal epithelium is secured by a population of limbal stem cells (LSC), which are located in the basal part of the limbal epithelium. Deficiency in LSC leads to chronic inflammation, scarring and conjunctivization of cornea. Therapy of LSC deficiency consists in transplantation of limbal tissue, cultivated limbal epithelium or more recently in tranplantation of autologous cells including mesenchymal stem cells, oral mucosal epithelial cells or hair follicle-derived stem cells...
February 2016: Ceská a Slovenská Oftalmologie
https://www.readbyqxmd.com/read/26981333/a-drug-delivery-system-for-administration-of-anti-tnf-%C3%AE-antibody
#14
Marie-Claude Robert, Mathieu Frenette, Chengxin Zhou, Yueran Yan, James Chodosh, Frederick A Jakobiec, Anna M Stagner, Demetrios Vavvas, Claes H Dohlman, Eleftherios I Paschalis
PURPOSE: To describe the fabrication, evaluation, and preliminary in vivo safety of a new drug delivery system (DDS) for topical anti-TNF-α antibody administration. METHODS: A DDS was fabricated using inverse template fabrication of a hydrophobic three-dimensional porous scaffold (100-300 μm in diameter porosity) loaded with 10% polyvinyl alcohol hydrogel carrying 5 mg/ml (weight/volume) of anti-TNF-α antibody. Drug-loaded DDS was sterilized with 25 kGy of gamma irradiation...
March 2016: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/26979116/-an-experimental-study-of-mesenchymal-stem-cells-in-tissue-engineering-scaffolds-implanted-in-rabbit-corneal-lamellae-to-increase-keratoprosthesis-biointegration
#15
H Bai, L L Wang, Y F Huang, J X Huang
OBJECTIVE: To complete a preliminary evaluation of the feasibility of implanting the complex of mouse bone marrow mesenchymal stem cells (BMSC) and a tissue engineering scaffold into rabbit corneal lamellae, based on which a solution may be proposed to consolidate the keratoprosthesis and the recipient surface, and to reduce the risk of complications. METHODS: This experimental study was composed of two parts. (1) In vitro: some mouse BMSC were marked with red fluorescent proteins (RFP) and integrated with a decellularized pig articular cartilage extracellular matrix (ECM) scaffold...
March 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/26837778/electrospun-mat-with-eyelid-fat-derived-stem-cells-as-a-scaffold-for-ocular-epithelial-regeneration
#16
Daruosh Momenzadeh, Alireza Baradaran-Rafii, Saeed Heidari Keshel, Maryam Ebrahimi, Esmaeil Biazar
The aim of this study was to develop nanofibrous gelatin substrates for eyelid fat stem cell (EFSC) expansion that can serve as a potential alternative substrate to replace human amniotic membrane. Biocompatibility results indicated that all substrates were highly biocompatible, as EFSCs could favorably attach and proliferate on the nanofibrous surfaces. Microscopic figures showed that the EFSC were firmly anchored to the substrates and were able to retain a normal stem cell phenotype. Immunocytochemistry (ICC) and real time-PCR results revealed change in the expression profile of EFSCs grown on nanofibrous substrates when compared to those grown on control in epithelial induction condition...
February 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/26828610/plasma-rich-in-growth-factors-for-the-treatment-of-ocular-surface-diseases
#17
REVIEW
Eduardo Anitua, Francisco Muruzabal, María de la Fuente, Jesús Merayo, Juan Durán, Gorka Orive
PURPOSE: The purpose of this work is to describe and review the technology of plasma rich in growth factors (PRGF), a novel blood derivative product, in the treatment of ocular surface disorders. METHODS: To demonstrate the importance of this technology in the treatment of ocular pathologies, a thorough review of the preclinical and clinical literature results obtained following use of the different therapeutic formulations of PRGF was carried out. A literature search for applications of PGRF plasma in the ophthalmology field was carried out using the PubMed database...
July 2016: Current Eye Research
https://www.readbyqxmd.com/read/26788074/limbal-stem-cell-deficiency-current-treatment-options-and-emerging-therapies
#18
REVIEW
Michel Haagdorens, Sara Ilse Van Acker, Veerle Van Gerwen, Sorcha Ní Dhubhghaill, Carina Koppen, Marie-José Tassignon, Nadia Zakaria
Severe ocular surface disease can result in limbal stem cell deficiency (LSCD), a condition leading to decreased visual acuity, photophobia, and ocular pain. To restore the ocular surface in advanced stem cell deficient corneas, an autologous or allogenic limbal stem cell transplantation is performed. In recent years, the risk of secondary LSCD due to removal of large limbal grafts has been significantly reduced by the optimization of cultivated limbal epithelial transplantation (CLET). Despite the great successes of CLET, there still is room for improvement as overall success rate is 70% and visual acuity often remains suboptimal after successful transplantation...
2016: Stem Cells International
https://www.readbyqxmd.com/read/26324020/oriented-nanofibrous-silk-as-a-natural-scaffold-for-ocular-epithelial-regeneration
#19
COMPARATIVE STUDY
Esmaeil Biazar, Alireza Baradaran-Rafii, Saeed Heidari-keshel, Sara Tavakolifard
The aim of this study was to develop nanofibrous silk substrates for limbal stem cell expansion that can serve as a potential alternative substrate to replace human amniotic membrane. The human limbal stem cell was used to evaluate the biocompatibility of substrates (random and oriented nanofibrous mats, and human amniotic membrane) based on their phenotypic profile, viability, proliferation, and attachment ability. Biocompatibility results indicated that all substrates were highly biocompatible, as limbal stem cells could favorably attach and proliferate on the nanofibrous surfaces...
2015: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/26277579/a-novel-pressed-porous-silicon-polycaprolactone-composite-as-a-dual-purpose-implant-for-the-delivery-of-cells-and-drugs-to-the-eye
#20
Yazad D Irani, Yuan Tian, Mengjia Wang, Sonja Klebe, Steven J McInnes, Nicolas H Voelcker, Jeffery L Coffer, Keryn A Williams
Dysfunction of corneal epithelial stem cells can result in painful and blinding disease of the ocular surface. In such cases, treatment may involve transfer of growth factor and normal adult stem cells to the ocular surface. Our purpose was to develop an implantable scaffold for the delivery of drugs and cells to the ocular surface. We examined the potential of novel composite biomaterials fabricated from electrospun polycaprolactone (PCL) fibres into which nanostructured porous silicon (pSi) microparticles of varying sizes (150-250 μm or <40 μm) had been pressed...
October 2015: Experimental Eye Research
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