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• W3177294450 abstract "<ns3:p><ns3:bold>Background: </ns3:bold>Porcine eyes have been widely used as <ns3:italic>ex vivo models </ns3:italic>in glaucoma research, as they share similar features with human eyes. Freeze-thawing is a non-invasive technique that has been used to obliterate living cells in anterior segment <ns3:italic>ex vivo</ns3:italic> cultures, to prepare them for further research such as cellular repopulation. This technique has previously been shown to reduce the intraocular pressure (IOP) in porcine eyes. The aim of this study was to investigate whether freeze-thaw cytoablation causes corresponding canalogram outflow changes in perfused anterior segment cultures (A<ns3:sub>FT</ns3:sub>) and whole porcine eyes (W<ns3:sub>FT</ns3:sub>). We hypothesized that the known IOP drop in A<ns3:sub>FT</ns3:sub> after trabecular meshwork ablation by freeze-thaw would be accompanied by a similarly large change in the distal outflow pattern.</ns3:p><ns3:p> <ns3:bold>Methods:</ns3:bold> Two-dye (fluorescein and Texas red) reperfusion canalograms were used to compare the outflow time before and after two -80°C cycles of freeze-thaw. We assigned 28 freshly enucleated porcine eyes to four groups: perfused anterior segment dye controls (A<ns3:sub>CO</ns3:sub>, n = 6), perfused whole eye dye controls (W<ns3:sub>CO</ns3:sub>, n = 6), freeze-thaw treated anterior segment cultures (A<ns3:sub>FT</ns3:sub>, n = 10), and freeze-thaw treated whole eyes (W<ns3:sub>FT</ns3:sub>, n = 6).</ns3:p><ns3:p> <ns3:bold>Results: </ns3:bold>In control groups A<ns3:sub>CO</ns3:sub> and W<ns3:sub>CO</ns3:sub>, the two different dyes had similar filling times. In A<ns3:sub>FT</ns3:sub>, the outflow pattern and filling times were unchanged. In W<ns3:sub>FT</ns3:sub>, the temporal superior quadrant filled more slowly (p = 0.042) while all others remained unchanged. The qualitative appearance of distal outflow spaces was altered only in some eyes.</ns3:p><ns3:p> <ns3:bold>Conclusions:</ns3:bold> Freeze-thaw cytoablation caused neither loss nor leakage of distal outflow structures. Surprisingly, the loss of an intact trabecular meshwork over the entire circumference did not result in a general acceleration of quadrant outflow times. The results validate freeze-thawing as a method to generate an extracellular matrix without major structural changes.</ns3:p>" @default.
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• W3177294450 date "2021-07-01" @default.
• W3177294450 modified "2023-09-30" @default.
• W3177294450 title "Impact of freeze-thaw cytoablation on aqueous outflow patterns in ex vivo anterior chamber perfusion cultures and whole eyes" @default.
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• W3177294450 doi "https://doi.org/10.12688/f1000research.53572.1" @default.
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