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Rachmian N, Medina S, Cherqui U, Akiva H, Deitch D, Edilbi D, Croese T, Salame TM, Ramos JMP, Cahalon L, Krizhanovsky V, Schwartz M. Identification of senescent, TREM2-expressing microglia in aging and Alzheimer's disease model mouse brain. Nat Neurosci 2024:10.1038/s41593-024-01620-8. [PMID: 38637622 DOI: 10.1038/s41593-024-01620-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 03/11/2024] [Indexed: 04/20/2024]
Abstract
Alzheimer's disease (AD) and dementia in general are age-related diseases with multiple contributing factors, including brain inflammation. Microglia, and specifically those expressing the AD risk gene TREM2, are considered important players in AD, but their exact contribution to pathology remains unclear. In this study, using high-throughput mass cytometry in the 5×FAD mouse model of amyloidosis, we identified senescent microglia that express high levels of TREM2 but also exhibit a distinct signature from TREM2-dependent disease-associated microglia (DAM). This senescent microglial protein signature was found in various mouse models that show cognitive decline, including aging, amyloidosis and tauopathy. TREM2-null mice had fewer microglia with a senescent signature. Treating 5×FAD mice with the senolytic BCL2 family inhibitor ABT-737 reduced senescent microglia, but not the DAM population, and this was accompanied by improved cognition and reduced brain inflammation. Our results suggest a dual and opposite involvement of TREM2 in microglial states, which must be considered when contemplating TREM2 as a therapeutic target in AD.
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Affiliation(s)
- Noa Rachmian
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Sedi Medina
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Ulysse Cherqui
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Hagay Akiva
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Daniel Deitch
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Dunya Edilbi
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Tommaso Croese
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Tomer Meir Salame
- Flow Cytometry Unit, Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | | | - Liora Cahalon
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Valery Krizhanovsky
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.
| | - Michal Schwartz
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel.
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Levi N, Papismadov N, Majewska J, Roitman L, Wigoda N, Eilam R, Tsoory M, Rotkopf R, Ovadya Y, Akiva H, Regev O, Krizhanovsky V. p21 facilitates chronic lung inflammation via epithelial and endothelial cells. Aging (Albany NY) 2023; 15:2395-2417. [PMID: 36996500 PMCID: PMC10120903 DOI: 10.18632/aging.204622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 03/17/2023] [Indexed: 04/01/2023]
Abstract
Cellular senescence is a stable state of cell cycle arrest that regulates tissue integrity and protects the organism from tumorigenesis. However, the accumulation of senescent cells during aging contributes to age-related pathologies. One such pathology is chronic lung inflammation. p21 (CDKN1A) regulates cellular senescence via inhibition of cyclin-dependent kinases (CDKs). However, its role in chronic lung inflammation and functional impact on chronic lung disease, where senescent cells accumulate, is less understood. To elucidate the role of p21 in chronic lung inflammation, we subjected p21 knockout (p21-/-) mice to repetitive inhalations of lipopolysaccharide (LPS), an exposure that leads to chronic bronchitis and accumulation of senescent cells. p21 knockout led to a reduced presence of senescent cells, alleviated the pathological manifestations of chronic lung inflammation, and improved the fitness of the mice. The expression profiling of the lung cells revealed that resident epithelial and endothelial cells, but not immune cells, play a significant role in mediating the p21-dependent inflammatory response following chronic LPS exposure. Our results implicate p21 as a critical regulator of chronic bronchitis and a driver of chronic airway inflammation and lung destruction.
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Affiliation(s)
- Naama Levi
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Nurit Papismadov
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Julia Majewska
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Lior Roitman
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Noa Wigoda
- Department of Life Sciences Core Facilities, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Raya Eilam
- Department of Veterinary Resources, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Michael Tsoory
- Department of Veterinary Resources, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Ron Rotkopf
- Department of Life Sciences Core Facilities, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Yossi Ovadya
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Hagay Akiva
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Ofer Regev
- Department of Immunology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Valery Krizhanovsky
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
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