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Graefe's Archive for Clinical and Experimental Ophthalmology

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01.01.2013 | Basic Science

Effects of crystallin-β-b2 on stressed RPE in vitro and in vivo

Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 1/2013

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Abstract

Background

Crystallins are thought to play a cytoprotective role in conditions of cellular stress. The aim of this study was to determine the effects of crystallin-β-b2 (cryβ-b2) and crystallin-β-b3 (cryβ-b3) on ARPE-19 cells in vitro and on the retinal pigment epithelium (RPE) in vivo.

Methods

The influence of cryβ-b2 and cryβ-b3 on the viability, proliferation and dying of ARPE-19 was measured by a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium assay, bromo-2-deoxyuridine assay and life/death assay. The expressions of cryβ-b2, cryβ-b3, glial-derived neurotrophic factor (GDNF), and galectin-3 (Gal-3) in ARPE-19 cells were evaluated using immunohistochemistry (IHC), Western blotting (WB) and real-time-quantitative-PCR (qRT-PCR). To evaluate the response of cryβ-b2 and cryβ-b3 to stressed ARPE-19 cells, the cells were exposed to UV-light. In a rat model, cryβ-b2-expressing neural progenitor cells (cryβ-b2-NPCs) were injected intravitreally after retinal stress induced by optic nerve axotomy to examine whether they influence the RPE. Protein expression was examined 2 and 4 weeks postsurgery using IHC and WB.

Results

Detectable alterations of GDNF, and Gal-3 were found in ARPE-19 cells upon exposure to UV light. Adding the crystallins to the medium promoted proliferation and increased viability of ARPE-19 cells in vitro. The obtained data support the view that these crystallins possess epithelioprotective properties. Likewise, in vivo, intravitreally injected cryβ-b2 and transplanted cryβ-b2-NPCs protected RPE from indirectly induced stress.

Conclusions

The data suggest that the RPE response to retinal ganglion cell denegeration is mediated via crystallins, which may thus be used therapeutically.

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Titel: Effects of crystallin-β-b2 on stressed RPE in vitro and in vivo
Publikationsdatum: 01.01.2013
Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology / Ausgabe 1/2013
Print ISSN: 0721-832X
Elektronische ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-012-2157-7

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Springer Medizin

Effects of crystallin-β-b2 on stressed RPE in vitro and in vivo

Abstract

Background

Methods

Results

Conclusions

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Springer Medizin

Abstract

Background

Methods

Results

Conclusions

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