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• W2989742918 abstract "Abstract It is not currently possible to reliably visualise and track immune cells in the human central nervous system or eye. Previous work demonstrated that indocyanine green (ICG) dye could label immune cells and be imaged after a delay during disease in the mouse retina. We report a pilot study investigating if ICG can similarly label immune cells within the human retina. Twelve adult participants receiving ICG angiography as part of routine standard of care were recruited. Baseline retinal images were obtained prior to ICG administration then repeated over a period ranging from 2 hours to 9 days. Matched peripheral blood samples, in addition to human and mouse macrophage cultures as controls, were analysed by flow cytometry. Differences between the delayed near infrared ICG imaging and 488 nm autofluorescence was observed across pathologies, likely arising from the retinal pigment epithelium (RPE). Only one subject demonstrated ICG signal on peripheral blood myeloid cells and only three distinct cell-sized signals appeared over time within the retina of three participants. No significant increase in immune cell activation markers were detected after ICG administration. ICG accumulated in the endosomes of macrophage cultures and was detectable above a minimum concentration, suggesting cell labelling is possible. ICG can label RPE and may be used as an additional biomarker for cell health across a range of retinal disorders. Standard clinical doses of intravenous ICG do not lead to robust immune cell labelling in human blood or retina and further optimisation in dose and route are required." @default.
• W2989742918 created "2019-12-05" @default.
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• W2989742918 date "2019-11-26" @default.
• W2989742918 modified "2023-10-18" @default.
• W2989742918 title "Intravenous indocyanine green dye is insufficient for robust immune cell labelling in the human retina" @default.
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• W2989742918 doi "https://doi.org/10.1101/856203" @default.
• W2989742918 hasPublicationYear "2019" @default.
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