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Photodegradation of lipofuscin in suspension and in ARPE-19 cells and the similarity of fluorescence of the photodegradation product with oxidized docosahexaenoate

Rozanowska, Malgorzata B. and Różanowski, Bartosz 2022. Photodegradation of lipofuscin in suspension and in ARPE-19 cells and the similarity of fluorescence of the photodegradation product with oxidized docosahexaenoate. International Journal of Molecular Sciences 23 (2) , 922. 10.3390/ijms23020922

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Retinal lipofuscin accumulates with age in the retinal pigment epithelium (RPE), where its fluorescence properties are used to assess retinal health. It was observed that there is a decrease in lipofuscin fluorescence above the age of 75 years and in the early stages of age-related macular degeneration (AMD). The purpose of this study was to investigate the response of lipofuscin isolated from human RPE and lipofuscin-laden cells to visible light, and to determine whether an abundant component of lipofuscin, docosahexaenoate (DHA), can contribute to lipofuscin fluorescence upon oxidation. Exposure of lipofuscin to visible light leads to a decrease in its long-wavelength fluorescence at about 610 nm, with a concomitant increase in the short-wavelength fluorescence. The emission spectrum of photodegraded lipofuscin exhibits similarity with that of oxidized DHA. Exposure of lipofuscin-laden cells to light leads to a loss of lipofuscin granules from cells, while retaining cell viability. The spectral changes in fluorescence in lipofuscin-laden cells resemble those seen during photodegradation of isolated lipofuscin. Our results demonstrate that fluorescence emission spectra, together with quantitation of the intensity of long-wavelength fluorescence, can serve as a marker useful for lipofuscin quantification and for monitoring its oxidation, and hence useful for screening the retina for increased oxidative damage and early AMD-related changes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Optometry and Vision Sciences
Additional Information: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Publisher: MDPI
ISSN: 1422-0067
Funders: the School of Optometry and Vision Sciences, Cardiff University, and the Wellcome Trust ISSF3 for Cardiff University
Date of First Compliant Deposit: 21 January 2022
Date of Acceptance: 12 January 2022
Last Modified: 09 Jun 2022 15:05

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