Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and AD
Abstract Background Cellular senescence, a hallmark of aging, has been implicated in Alzheimer’s disease (AD) pathogenesis. Cholesterol accumulation is known to drive cellular senescence; however, its underlying mechanisms are not fully understood. ATP-binding cassette transporter A1 (ABCA1) plays a...
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BMC
2025-02-01
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| Series: | Molecular Neurodegeneration |
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| Online Access: | https://doi.org/10.1186/s13024-025-00802-7 |
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| author | Shaowei Wang Boyang Li Jie Li Zhiheng Cai Cristelle Hugo Yi Sun Lu Qian Julia TCW Helena C. Chui Dante Dikeman Isaac Asante Stan G. Louie David A. Bennett Zoe Arvanitakis Alan T. Remaley Bilal E. Kerman Hussein N. Yassine |
| author_facet | Shaowei Wang Boyang Li Jie Li Zhiheng Cai Cristelle Hugo Yi Sun Lu Qian Julia TCW Helena C. Chui Dante Dikeman Isaac Asante Stan G. Louie David A. Bennett Zoe Arvanitakis Alan T. Remaley Bilal E. Kerman Hussein N. Yassine |
| author_sort | Shaowei Wang |
| collection | DOAJ |
| description | Abstract Background Cellular senescence, a hallmark of aging, has been implicated in Alzheimer’s disease (AD) pathogenesis. Cholesterol accumulation is known to drive cellular senescence; however, its underlying mechanisms are not fully understood. ATP-binding cassette transporter A1 (ABCA1) plays an important role in cholesterol homeostasis, and its expression and trafficking are altered in APOE4 and AD models. However, the role of ABCA1 trafficking in cellular senescence associated with APOE4 and AD remains unclear. Methods We examined the association between cellular senescence and ABCA1 expression in human postmortem brain samples using transcriptomic, histological, and biochemical analyses. Unbiased proteomic screening was performed to identify the proteins that mediate cellular ABCA1 trafficking. We created ABCA1 knock out cell lines and mouse models to validate the role of ABCA1 in cholesterol-induced mTORC1 activation and senescence. Additionally, we used APOE4-TR mice and induced pluripotent stem cell (iPSC) models to explore cholesterol-ABCA1-senescence pathways. Results Transcriptomic profiling of the human dorsolateral prefrontal cortex from the Religious Order Study/Memory Aging Project (ROSMAP) cohort revealed the upregulation of cellular senescence transcriptome signatures in AD, which correlated with ABCA1 expression and oxysterol levels. Immunofluorescence and immunoblotting analyses confirmed increased lipofuscin-stained lipids and ABCA1 expression in AD brains and an association with mTOR phosphorylation. Discovery proteomics identified caveolin-1, a sensor of cellular cholesterol accumulation, as a key promoter of ABCA1 endolysosomal trafficking. Greater caveolin-1 expression was observed in APOE4-TR mouse models and AD human brains. Oxysterol induced mTORC1 activation and senescence were regulated by ABCA1 lysosomal trapping. Treatment of APOE4-TR mice with cyclodextrin reduced brain oxysterol levels, ABCA1 lysosome trapping, mTORC1 activation, and attenuated senescence and neuroinflammation markers. In human iPSC-derived astrocytes, the reduction of cholesterol by cyclodextrin attenuated inflammatory responses. Conclusions Oxysterol accumulation in APOE4 and AD induced ABCA1 and caveolin-1 expression, contributing to lysosomal dysfunction and increased cellular senescence markers. This study provides novel insights into how cholesterol metabolism accelerates features of brain cellular senescence pathway and identifies therapeutic targets to mitigate these processes. |
| format | Article |
| id | doaj-art-a54f42427b0941998a14c6fa6eba3077 |
| institution | Kabale University |
| issn | 1750-1326 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | BMC |
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| series | Molecular Neurodegeneration |
| spelling | doaj-art-a54f42427b0941998a14c6fa6eba30772025-02-09T12:54:12ZengBMCMolecular Neurodegeneration1750-13262025-02-0120112610.1186/s13024-025-00802-7Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and ADShaowei Wang0Boyang Li1Jie Li2Zhiheng Cai3Cristelle Hugo4Yi Sun5Lu Qian6Julia TCW7Helena C. Chui8Dante Dikeman9Isaac Asante10Stan G. Louie11David A. Bennett12Zoe Arvanitakis13Alan T. Remaley14Bilal E. Kerman15Hussein N. Yassine16Keck School of Medicine, University of Southern CaliforniaKeck School of Medicine, University of Southern CaliforniaKeck School of Medicine, University of Southern CaliforniaKeck School of Medicine, University of Southern CaliforniaKeck School of Medicine, University of Southern CaliforniaKeck School of Medicine, University of Southern CaliforniaDepartment of Pharmacology, Physiology & Biophysics, Chobanian & Avedisian School of Medicine, Boston UniversityDepartment of Pharmacology, Physiology & Biophysics, Chobanian & Avedisian School of Medicine, Boston UniversityKeck School of Medicine, University of Southern CaliforniaAlfred E. Mann School of Pharmacy, University of Southern CaliforniaDepartment of Ophthalmology, Keck School of MedicineAlfred E. Mann School of Pharmacy, University of Southern CaliforniaRush Alzheimer’s Disease Center, Rush University Medical CenterRush Alzheimer’s Disease Center, Rush University Medical CenterNational Heart, Lung and Blood Institute, National Institutes of HealthKeck School of Medicine, University of Southern CaliforniaKeck School of Medicine, University of Southern CaliforniaAbstract Background Cellular senescence, a hallmark of aging, has been implicated in Alzheimer’s disease (AD) pathogenesis. Cholesterol accumulation is known to drive cellular senescence; however, its underlying mechanisms are not fully understood. ATP-binding cassette transporter A1 (ABCA1) plays an important role in cholesterol homeostasis, and its expression and trafficking are altered in APOE4 and AD models. However, the role of ABCA1 trafficking in cellular senescence associated with APOE4 and AD remains unclear. Methods We examined the association between cellular senescence and ABCA1 expression in human postmortem brain samples using transcriptomic, histological, and biochemical analyses. Unbiased proteomic screening was performed to identify the proteins that mediate cellular ABCA1 trafficking. We created ABCA1 knock out cell lines and mouse models to validate the role of ABCA1 in cholesterol-induced mTORC1 activation and senescence. Additionally, we used APOE4-TR mice and induced pluripotent stem cell (iPSC) models to explore cholesterol-ABCA1-senescence pathways. Results Transcriptomic profiling of the human dorsolateral prefrontal cortex from the Religious Order Study/Memory Aging Project (ROSMAP) cohort revealed the upregulation of cellular senescence transcriptome signatures in AD, which correlated with ABCA1 expression and oxysterol levels. Immunofluorescence and immunoblotting analyses confirmed increased lipofuscin-stained lipids and ABCA1 expression in AD brains and an association with mTOR phosphorylation. Discovery proteomics identified caveolin-1, a sensor of cellular cholesterol accumulation, as a key promoter of ABCA1 endolysosomal trafficking. Greater caveolin-1 expression was observed in APOE4-TR mouse models and AD human brains. Oxysterol induced mTORC1 activation and senescence were regulated by ABCA1 lysosomal trapping. Treatment of APOE4-TR mice with cyclodextrin reduced brain oxysterol levels, ABCA1 lysosome trapping, mTORC1 activation, and attenuated senescence and neuroinflammation markers. In human iPSC-derived astrocytes, the reduction of cholesterol by cyclodextrin attenuated inflammatory responses. Conclusions Oxysterol accumulation in APOE4 and AD induced ABCA1 and caveolin-1 expression, contributing to lysosomal dysfunction and increased cellular senescence markers. This study provides novel insights into how cholesterol metabolism accelerates features of brain cellular senescence pathway and identifies therapeutic targets to mitigate these processes.https://doi.org/10.1186/s13024-025-00802-7Alzheimer’s diseaseSenescenceABCA1Caveolin-1CholesterolLysosome |
| spellingShingle | Shaowei Wang Boyang Li Jie Li Zhiheng Cai Cristelle Hugo Yi Sun Lu Qian Julia TCW Helena C. Chui Dante Dikeman Isaac Asante Stan G. Louie David A. Bennett Zoe Arvanitakis Alan T. Remaley Bilal E. Kerman Hussein N. Yassine Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and AD Molecular Neurodegeneration Alzheimer’s disease Senescence ABCA1 Caveolin-1 Cholesterol Lysosome |
| title | Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and AD |
| title_full | Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and AD |
| title_fullStr | Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and AD |
| title_full_unstemmed | Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and AD |
| title_short | Cellular senescence induced by cholesterol accumulation is mediated by lysosomal ABCA1 in APOE4 and AD |
| title_sort | cellular senescence induced by cholesterol accumulation is mediated by lysosomal abca1 in apoe4 and ad |
| topic | Alzheimer’s disease Senescence ABCA1 Caveolin-1 Cholesterol Lysosome |
| url | https://doi.org/10.1186/s13024-025-00802-7 |
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