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Home > Medicine & Health Science textbooks > Pre-clinical medicine: basic sciences > Anatomy > In Vitro and in Vivo Evaluation of Iris Pigment Epithelial Cells Cultured on Surface Modified Expanded-Polytetrafluorethylene Substrates as a Potential Therapeutic Strategy for Retinal Degeneration
In Vitro and in Vivo Evaluation of Iris Pigment Epithelial Cells Cultured on Surface Modified Expanded-Polytetrafluorethylene Substrates as a Potential Therapeutic Strategy for Retinal Degeneration

In Vitro and in Vivo Evaluation of Iris Pigment Epithelial Cells Cultured on Surface Modified Expanded-Polytetrafluorethylene Substrates as a Potential Therapeutic Strategy for Retinal Degeneration


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This dissertation, "In Vitro and in Vivo Evaluation of Iris Pigment Epithelial Cells Cultured on Surface Modified Expanded-polytetrafluorethylene Substrates as a Potential Therapeutic Strategy for Retinal Degeneration" by 年申, Shen, Nian, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Retinal degenerative diseases are diseases that may severely affect vision of people at different ages. These include retinitis pigmentosa (RP) and age-related macular degeneration (AMD). The current treatments for these diseases are limited. Since dysfunction and atrophy of the RPE are the key factors in the development of retinal degenerative diseases, transplantation of healthy retinal pigment epithelial (RPE) cells might be a promising therapeutic strategy. However, homologous RPE cells may lead to host immune rejection and harvesting autologous RPE cells may cause severe complications. Autologous iris pigment epithelial (IPE) cells, which are relatively easy to obtain, possess the same embryonic origin and share similar characteristics as RPE cells. Therefore, they may be used as a substitute of RPE cells for transplantation. Increasing interests have been demonstrated with the use of substrate to support cell attachment, proliferation and differentiation, so that transplanted cells could maintain the differentiated phenotype and perform their normal functions. However, degradation of biodegradable substrates may cause the breakdown of functional cell monolayer and produce toxic byproducts. Therefore, the aim of current study is to investigate the in vitro characteristics of rat IPE cells cultured on surface modified non-degradable expanded-polytetrafluorethylene (ePTFE) substrates and host response to the substrates without cells. Primary pure IPE cells were successfully isolated from rat eyes, which provided abundant cells for subsequent experiments. IPE cells harvested from both Long Evans rats and Dark Agouti rats proliferated and reached confluence on fibronectin coated n-heptylamine modified (F-HA) ePTFE substrates. These cells exhibited cuboidal or polygonal morphology with heavy pigmentation. In addition to the typical epithelial cell morphology, rat IPE cells grown on F-HA ePTFE substrates were able to form a cell monolayer with functional formation of tight junctional complex between neighboring cells. The IPE cell monolayers also demonstrated increased phagocytosis of photoreceptor outer segments (POS) with time and expression of cellular retinylaldehyde-binding protein (CRALBP) that served an important role in the conversion of all-trans-retinal to 11-cis-retinal in visual cycle. In the in vivo study, F-HA ePTFE substrate was successfully transplanted into the subretinal space of Royal College of Surgeons (RCS) rat, which is a well-recognized animal model of retinal degeneration. The F-HA ePTFE substrate remained flat up to 4 weeks after transplantation and did not induce significant up-regulation of pro-inflammatory cytokines TNFα and IL1β as well as activation of Muller cells and astrocytes which occurred in response to retinal inflammation. In conclusion, rat IPE cells that were grown on F-HA ePTFE substrate were able to establish a monolayer with functional tight junctions and RPE-specific functions. The F-HA ePTFE substrate demonstrated good biocompatibility in the subretinal space of RCS rats. These findings provide a potential therapeutic strategy for retinal degeneration. DOI: 10.5353/th_b4979921 Subjects: Epithelial cells Retinal degeneration - Treatment


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Product Details
  • ISBN-13: 9781361005095
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 250
  • Weight: 871 gr
  • ISBN-10: 1361005092
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 16 mm
  • Width: 216 mm


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In Vitro and in Vivo Evaluation of Iris Pigment Epithelial Cells Cultured on Surface Modified Expanded-Polytetrafluorethylene Substrates as a Potential Therapeutic Strategy for Retinal Degeneration
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