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Molecular Neurodegeneration
Article . 2024 . Peer-reviewed
License: CC BY
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Molecular Neurodegeneration
Article . 2024
Data sources: DOAJ
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DIGITAL.CSIC
Article . 2025 . Peer-reviewed
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Urolithin A promotes p62-dependent lysophagy to prevent acute retinal neurodegeneration

Authors: Juan Ignacio Jiménez-Loygorri; Álvaro Viedma-Poyatos; Raquel Gómez-Sintes; Patricia Boya;

Urolithin A promotes p62-dependent lysophagy to prevent acute retinal neurodegeneration

Abstract

Abstract Background Age-related macular degeneration (AMD) is the leading cause of blindness in elderly people in the developed world, and the number of people affected is expected to almost double by 2040. The retina presents one of the highest metabolic demands in our bodies that is partially or fully fulfilled by mitochondria in the neuroretina and retinal pigment epithelium (RPE), respectively. Together with its post-mitotic status and constant photooxidative damage from incoming light, the retina requires a tightly-regulated housekeeping system that involves autophagy. The natural polyphenol Urolithin A (UA) has shown neuroprotective benefits in several models of aging and age-associated disorders, mostly attributed to its ability to induce mitophagy and mitochondrial biogenesis. Sodium iodate (SI) administration recapitulates the late stages of AMD, including geographic atrophy and photoreceptor cell death. Methods A combination of in vitro, ex vivo and in vivo models were used to test the neuroprotective potential of UA in the SI model. Functional assays (OCT, ERGs), cellular analysis (flow cytometry, qPCR) and fine confocal microscopy (immunohistochemistry, tandem selective autophagy reporters) helped address this question. Results UA alleviated neurodegeneration and preserved visual function in SI-treated mice. Simultaneously, we observed severe proteostasis defects upon SI damage induction, including autophagosome accumulation, that were resolved in animals that received UA. Treatment with UA restored autophagic flux and triggered PINK1/Parkin-dependent mitophagy, as previously reported in the literature. Autophagy blockage caused by SI was caused by severe lysosomal membrane permeabilization. While UA did not induce lysosomal biogenesis, it did restore upcycling of permeabilized lysosomes through lysophagy. Knockdown of the lysophagy adaptor SQSTM1/p62 abrogated viability rescue by UA in SI-treated cells, exacerbated lysosomal defects and inhibited lysophagy. Conclusions Collectively, these data highlight a novel putative application of UA in the treatment of AMD whereby it bypasses lysosomal defects by promoting p62-dependent lysophagy to sustain proteostasis. Graphical Abstract

Country
Spain
Keywords

SQSTM1/p62, Iodates, Sodium iodate, Retina, Mice, Macular Degeneration, Coumarins, Sequestosome-1 Protein, Autophagy, Animals, Humans, RC346-429, Lysosomal membrane permeabilization, Age-related macular degeneration, RC952-954.6, Mitophagy, Lysophagy, Urolithin A, Mice, Inbred C57BL, Disease Models, Animal, Neuroprotective Agents, Geriatrics, Neurology. Diseases of the nervous system, Lysosomes, Research Article

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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