Journal
AGING-US
Volume 11, Issue 13, Pages 4323-4337Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/aging.102039
Keywords
A2E; HMGB1; Caveolin-1; RPE cell senescence; AMD
Categories
Funding
- Natural Science Foundation of Tianjin City [17JCYBJC27200, BJ-LM2015008L]
- National Natural Science Funds [81400412]
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Accumulation of lipofuscin in the retinal pigment epithelium (RPE) is considered a major cause of RPE dysfunction and senescence in age-related macular degeneration (AMD), and N-retinylidene-N-retinyle-thanolamine (A2E) is the main fluorophore identified in lipofuscin from aged human eyes. Here, human induced pluripotent stem cell (iPSC)-RPE was generated from healthy individuals to reveal proteomic changes associated with A2E-related RPE cell senescence. A novel RPE cell senescence-related protein, high-mobility group box 1 (HMGB1), was identified based on proteomic mass spectrometry measurements on iPSC-RPE with A2E treatment. Furthermore, HMGB1 upregulated Caveolin-1, which also was related RPE cell senescence. To investigate whether changes in HMGB1 and Caveolin-1 expression under A2E exposure contribute to RPE cell senescence, human ARPE-19 cells were stimulated with A2E; expression of HMGB1, Caveolin-1, tight junction proteins and senescent phenotypes were verified. HMGB1 inhibition alleviated A2E induced cell senescence. Migration of RPE cells was evaluated. Notably, A2E less than or equal to 10 mu M induced both HMGB1 and Caveolin-1 protein upregulation and HMGB1 translocation, while Caveolin-1 expression was downregulated when there was more than 10 mu M A2E. Our data indicate that A2E-induced upregulation of HMGB1. Caveolin-1 and HMGB1 release may relate to RPE cell senescence and play a role in the pathogenesis of AMD.
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