{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T04:51:24Z","timestamp":1790052684213,"version":"4.0.1"},"reference-count":61,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,4,19]],"date-time":"2026-04-19T00:00:00Z","timestamp":1776556800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["82274341, 82405487"],"award-info":[{"award-number":["82274341, 82405487"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"award":["82274341, 82405487"],"award-info":[{"award-number":["82274341, 82405487"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004735","name":"Natural Science Foundation of Hunan Province","doi-asserted-by":"publisher","award":["2024JJ5304, 2025JJ60633"],"award-info":[{"award-number":["2024JJ5304, 2025JJ60633"]}],"id":[{"id":"10.13039\/501100004735","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Key Research and Development Program of Hunan Province","award":["2024JK2122"],"award-info":[{"award-number":["2024JK2122"]}]},{"name":"Scientific research project of Hunan Provincial Department of Education","award":["23A0278, 23B0346"],"award-info":[{"award-number":["23A0278, 23B0346"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>The retinal pigment epithelium (RPE) is a long-lived, highly polarised epithelial monolayer that performs essential functions in retinal homeostasis, including outer blood\u2013retina barrier maintenance, visual cycle activity, metabolic exchange, phagocytic clearance of photoreceptor outer segments, and regulation of oxidative and immune balance. Because RPE cells persist for decades under conditions of sustained oxidative, metabolic, and phagocytic stress, this tissue provides a valuable model for examining how long-lived post-mitotic cells preserve function over time and how age-related dysfunction emerges when that balance weakens. Although much of the current literature on RPE ageing has been shaped by age-related macular degeneration (AMD), age-dependent change in the RPE should not be understood solely as a preclinical stage of disease. Rather, the ageing RPE offers a broader framework for studying cellular maintenance under chronic physiological load. In this review, we synthesise current evidence on RPE ageing across four interrelated domains: structural remodelling, mitochondrial and metabolic imbalance, proteostatic and lysosomal burden, and chronic inflammatory dysregulation. Across these processes, ageing in the RPE is expressed less as widespread cell loss than as progressive decline in cellular organisation, buffering capacity, and functional precision. Structural irregularity, altered mitochondrial regulation, incomplete degradative clearance, and persistent low-grade inflammatory signalling together reduce the ability of the RPE to maintain long-term homeostasis and increase vulnerability to age-related retinal dysfunction. We further argue that ageing in the RPE is best understood not as abrupt failure of isolated pathways, but as gradual loss of system coherence among interacting homeostatic systems that remain active while operating under increasing constraint. This view helps integrate diverse cellular and molecular findings and highlights the RPE as an informative model for understanding ageing in long-lived post-mitotic tissues.<\/jats:p>","DOI":"10.3390\/cells15080725","type":"journal-article","created":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T12:01:22Z","timestamp":1776686482000},"page":"725","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Retinal Pigment Epithelium Ageing: Cellular and Molecular Mechanisms of Long-Term Homeostasis and Age-Related Dysfunction"],"prefix":"10.3390","volume":"15","author":[{"given":"Yijing","family":"Yang","sequence":"first","affiliation":[{"name":"Faculty of Traditional Chinese Medicine, Hunan University of Chinese Medicine, Changsha 410208, China"},{"name":"Institute of Ophthalmology and Otolaryngology of Chinese Medicine, Changsha 410208, China"},{"name":"Changsha Centre for Innovation in Traditional Chinese Medicine Techniques for the Prevention and Treatment of Retinal Diseases and Visual Function Protection, Changsha 410208, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pei","family":"Liu","sequence":"additional","affiliation":[{"name":"Faculty of Traditional Chinese Medicine, Hunan University of Chinese Medicine, Changsha 410208, China"},{"name":"Changsha Centre for Innovation in Traditional Chinese Medicine Techniques for the Prevention and Treatment of Retinal Diseases and Visual Function Protection, Changsha 410208, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiangwei","family":"Li","sequence":"additional","affiliation":[{"name":"Faculty of Traditional Chinese Medicine, Hunan University of Chinese Medicine, Changsha 410208, China"},{"name":"Institute of Ophthalmology and Otolaryngology of Chinese Medicine, Changsha 410208, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Deng","sequence":"additional","affiliation":[{"name":"Faculty of Traditional Chinese Medicine, Hunan University of Chinese Medicine, Changsha 410208, China"},{"name":"Institute of Ophthalmology and Otolaryngology of Chinese Medicine, Changsha 410208, China"},{"name":"Changsha Centre for Innovation in Traditional Chinese Medicine Techniques for the Prevention and Treatment of Retinal Diseases and Visual Function Protection, Changsha 410208, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li","family":"Xiao","sequence":"additional","affiliation":[{"name":"Faculty of Traditional Chinese Medicine, Hunan University of Chinese Medicine, Changsha 410208, China"},{"name":"Institute of Ophthalmology and Otolaryngology of Chinese Medicine, Changsha 410208, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinghua","family":"Peng","sequence":"additional","affiliation":[{"name":"Faculty of Traditional Chinese Medicine, Hunan University of Chinese Medicine, Changsha 410208, China"},{"name":"Institute of Ophthalmology and Otolaryngology of Chinese Medicine, Changsha 410208, China"},{"name":"Changsha Centre for Innovation in Traditional Chinese Medicine Techniques for the Prevention and Treatment of Retinal Diseases and Visual Function Protection, Changsha 410208, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Peng","sequence":"additional","affiliation":[{"name":"Faculty of Traditional Chinese Medicine, Hunan University of Chinese Medicine, Changsha 410208, China"},{"name":"Institute of Ophthalmology and Otolaryngology of Chinese Medicine, Changsha 410208, China"},{"name":"Changsha Centre for Innovation in Traditional Chinese Medicine Techniques for the Prevention and Treatment of Retinal Diseases and Visual Function Protection, Changsha 410208, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"243","DOI":"10.1016\/j.cell.2022.11.001","article-title":"Hallmarks of aging: An expanding universe","volume":"186","author":"Blasco","year":"2023","journal-title":"Cell"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"729","DOI":"10.1038\/nrm2233","article-title":"Cellular senescence: When bad things happen to good cells","volume":"8","author":"Campisi","year":"2007","journal-title":"Nat. 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