TREM2-ASM Crosstalk in Microglial Lysosomal Senescence
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From Analysis:
Gene expression changes in aging mouse brain predicting neurodegenerative vulnerability
What gene expression changes in the aging mouse brain predict neurodegenerative vulnerability? Use Allen Aging Mouse Brain Atlas data. Cross-reference with human AD datasets. Produce hypotheses about aging-neurodegeneration mechanisms.
Hypotheses from Same Analysis (8)
These hypotheses emerged from the same multi-agent debate that produced this hypothesis.
Description
This hypothesis proposes that TREM2-dependent microglial senescence is mechanistically driven by dysregulated acid sphingomyelinase (ASM) activity and ceramide accumulation in aging microglia. During normal aging, TREM2 signaling undergoes fundamental changes that disrupt sphingolipid homeostasis, leading to increased ASM activity in microglial lysosomes. This creates a pathological ceramide-rich environment that triggers the senescence-associated secretory phenotype (SASP) and transforms protective microglial responses into neurotoxic ones.
...Pathway Diagram
flowchart TD
subgraph Genetics["Genetic Risk"]
A1["TREM2 R47H Variant<br/>3x AD Risk"] --> A2["Impaired Ligand Binding<br/>(Abeta, ApoE, PS)"]
A3["TREM2 R62H Variant<br/>2x AD Risk"] --> A4["Reduced Surface Expression"]
A5["TREM2 H157Y<br/>Increased Shedding"] --> A6["Elevated sTREM2"]
end
subgraph Signaling["TREM2 Signaling Cascade"]
B1["TREM2 + DAP12/TYROBP"] --> B2["ITAM Phosphorylation"]
B2 --> B3["SYK Kinase Activation"]
B3 --> B4["PI3K/AKT Pathway"]
B3 --> B5["PLCgamma2/Ca2+ Flux"]
B4 --> B6["mTOR -> Metabolic Reprogramming"]
B4 --> B7["NF-kappaB Modulation"]
B5 --> B8["NFAT Translocation"]
end
subgraph Microglial["Microglial States"]
C1["Homeostatic Microglia<br/>(P2RY12+, CX3CR1+)"]
C2["Disease-Associated Microglia<br/>(DAM Stage 1)"]
C3["DAM Stage 2<br/>(TREM2-dependent)"]
C4["Senescent Microglia<br/>(p16+, p21+, SA-beta-gal+)"]
C1 -->|"Abeta sensing"| C2
C2 -->|"TREM2 signal"| C3
C2 -->|"chronic stress"| C4
end
subgraph Senescence["Senescence Program"]
D1["DNA Damage Response<br/>(ATM/ATR)"] --> D2["p53 Stabilization"]
D2 --> D3["p21/CDKN1A Upregulation"]
D3 --> D4["Cell Cycle Arrest"]
D4 --> D5["SASP Activation"]
D5 --> D6["IL-6, IL-1beta, TNF-alpha<br/>MMP3, MMP9"]
D5 --> D7["Extracellular Vesicles<br/>(pro-inflammatory cargo)"]
end
subgraph Pathology["Downstream Pathology"]
E1["Impaired Abeta Clearance"]
E2["Tau Propagation"]
E3["Synaptic Loss"]
E4["BBB Dysfunction"]
E1 --> E5["Plaque Accumulation"]
E2 --> E6["Tangle Formation"]
E3 --> E7["Cognitive Decline"]
E4 --> E7
E5 --> E7
E6 --> E7
end
subgraph Therapy["Therapeutic Strategy"]
F1["TREM2 Agonist Antibodies<br/>(AL002/Latozinemab)"]
F2["Senolytic Drugs<br/>(Dasatinib + Quercetin)"]
F3["SASP Inhibitors<br/>(Rapamycin, Ruxolitinib)"]
end
A2 --> B1
A4 --> B1
B6 --> C3
C3 -->|"sustained activation"| D1
C4 --> D5
D6 --> E1
D6 --> E2
D6 --> E3
D6 --> E4
F1 -.->|"restore"| B1
F1 -.->|"promote"| C3
F2 -.->|"clear"| C4
F3 -.->|"block"| D5
style A1 fill:#ce93d8,color:#000
style A3 fill:#ce93d8,color:#000
style A5 fill:#ce93d8,color:#000
style C3 fill:#4fc3f7,color:#000
style C4 fill:#ffd54f,color:#000
style D5 fill:#ff8a65,color:#000
style E7 fill:#ef5350,color:#fff
style F1 fill:#81c784,color:#000
style F2 fill:#81c784,color:#000
style F3 fill:#81c784,color:#000
3D Protein Structure
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✓ Supporting Evidence 36
Sleep loss is associated with cognitive decline in the aging population and is a risk factor for Alzheimer's disease (AD). Considering the crucial role of immunomodulating genes such as that encoding the triggering receptor expressed on myeloid cells type 2 (TREM2) in removing pathogenic amyloid-β (Aβ) plaques and regulating neurodegeneration in the brain, our aim was to investigate whether and how sleep loss influences microglial function in mice. We chronically sleep-deprived wild-type mice an
Human and mouse single-nucleus transcriptomics reveal TREM2-dependent and TREM2-independent cellular responses… MEDIUM▼
Glia have been implicated in Alzheimer's disease (AD) pathogenesis. Variants of the microglia receptor triggering receptor expressed on myeloid cells 2 (TREM2) increase AD risk, and activation of disease-associated microglia (DAM) is dependent on TREM2 in mouse models of AD. We surveyed gene-expression changes associated with AD pathology and TREM2 in 5XFAD mice and in human AD by single-nucleus RNA sequencing. We confirmed the presence of Trem2-dependent DAM and identified a previously undiscov
Genetic studies have highlighted microglia as pivotal in orchestrating Alzheimer's disease (AD). Microglia that adhere to Aβ plaques acquire a transcriptional signature, "disease-associated microglia" (DAM), which largely emanates from the TREM2-DAP12 receptor complex that transmits intracellular signals through the protein tyrosine kinase SYK. The human TREM2R47H variant associated with high AD risk fails to activate microglia via SYK. We found that SYK-deficient microglia cannot encase Aβ plaq
Elevated risk of developing Alzheimer's disease (AD) is associated with hypomorphic variants of TREM2, a surface receptor required for microglial responses to neurodegeneration, including proliferation, survival, clustering, and phagocytosis. How TREM2 promotes such diverse responses is unknown. Here, we find that microglia in AD patients carrying TREM2 risk variants and TREM2-deficient mice with AD-like pathology have abundant autophagic vesicles, as do TREM2-deficient macrophages under growth-
Explores genetic variations linked to neurodegenerative disease proteins, potentially supporting the TREM2-dep…▼
Investigates gene editing technologies for Alzheimer's disease, which could relate to modulating TREM2 signali…▼
Directly studies the microglial TREM2 receptor's role in brain development, supporting its functional signific…▼
Examines phagocyte mechanisms in amyloid generation, which relates to microglial function proposed in the TREM…▼
Investigates signaling pathways related to genetic resilience in Alzheimer's disease, potentially supporting T…▼
Alzheimer's disease-linked risk alleles elevate microglial cGAS-associated senescence and neurodegeneration in… HIGH▼
The strongest risk factors for late-onset sporadic Alzheimer's disease (AD) include the ε4 allele of apolipoprotein E (APOE), the R47H variant of triggering receptor expressed on myeloid cells 2 (TREM2), and female sex. Here, we combine APOE4 and TREM2
The neuroimmune system is involved in development, normal functioning, aging, and injury of the central nervous system. Microglia, first described a century ago, are the main neuroimmune cells and have three essential functions: a sentinel function involved in constant sensing of changes in their environment, a housekeeping function that promotes neuronal well-being and normal operation, and a def
TREM2 receptor protects against complement-mediated synaptic loss by binding to complement C1q during neurodeg… MEDIUM▼
Triggering receptor expressed on myeloid cells 2 (TREM2) is strongly linked to Alzheimer's disease (AD) risk, but its functions are not fully understood. Here, we found that TREM2 specifically attenuated the activation of classical complement cascade via high-affinity binding to its initiator C1q. In the human AD brains, the formation of TREM2-C1q complexes was detected, and the increased density
Triggering receptor expressed on myeloid cells 2 (TREM2) is an innate immune receptor predominantly expressed by microglia in the brain. Recent studies have established TREM2 as a central immune signaling hub in neurodegeneration, where it triggers immune responses upon sensing pathological development and tissue damages. TREM2 binds diverse ligands and activates downstream pathways that regulate
Soluble TREM2 ameliorates tau phosphorylation and cognitive deficits through activating transgelin-2 in Alzhei… MEDIUM▼
Triggering receptor expressed on myeloid cells 2 (TREM2) is a transmembrane protein that is predominantly expressed by microglia in the brain. The proteolytic shedding of TREM2 results in the release of soluble TREM2 (sTREM2), which is increased in the cerebrospinal fluid of patients with Alzheimer's disease (AD). It remains unknown whether sTREM2 regulates the pathogenesis of AD. Here we identifi
Variants of the gene triggering receptor expressed on myeloid cells-2 (TREM2) increase the risk of Alzheimer's disease (AD) and other neurodegenerative disorders. Signaling by TREM2, an innate immune receptor expressed by microglia, is thought to enhance phagocytosis of amyloid beta (Aβ) and other damaged proteins, promote microglial proliferation, migration, and survival, and regulate inflammator
1. Nat Neurosci. 2024 Jun;27(6):1116-1124. doi: 10.1038/s41593-024-01620-8. Epub 2024 Apr 18. Identification of senescent, TREM2-expressing microglia in aging and Alzheimer's disease model mouse brain. Rachmian N(1)(2), Medina S(#)(2), Cherqui U(#)(1), Akiva H(#)(1), Deitch D(2), Edilbi D(1), Croese T(2), Salame TM(3), Ramos JMP(2), Cahalon L(2), Krizhanovsky V(4), Schwartz M(5). Author information: (1)Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel. (2)Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel. (3)Flow Cytometry Unit, Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel. (4)Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel. valery.krizhanovsky@weizm
1. Neuron. 2021 Apr 7;109(7):1100-1117.e10. doi: 10.1016/j.neuron.2021.01.027. Epub 2021 Feb 18. White matter aging drives microglial diversity. Safaiyan S(1), Besson-Girard S(2), Kaya T(3), Cantuti-Castelvetri L(1), Liu L(2), Ji H(2), Schifferer M(4), Gouna G(1), Usifo F(2), Kannaiyan N(5), Fitzner D(6), Xiang X(7), Rossner MJ(5), Brendel M(8), Gokce O(9), Simons M(10). Author information: (1)Institute of Neuronal Cell Biology, Technical University Munich, 80802 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany. (2)Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany. (3)Institute of Neuronal Cell Biology, Technical University Munich, 80802 Munich, Germany; German Center for Neurode
1. Antioxidants (Basel). 2023 Aug 21;12(8):1646. doi: 10.3390/antiox12081646. Effects of Fisetin Treatment on Cellular Senescence of Various Tissues and Organs of Old Sheep. Huard CA(1), Gao X(1), Dey Hazra ME(1)(2), Dey Hazra RO(1)(2)(3), Lebsock K(4), Easley JT(4), Millett PJ(1)(2), Huard J(1). Author information: (1)Linda and Mitch Hart Center for Regenerative and Personalized Medicine, Steadman Philippon Research Institute, Vail, CO 81657, USA. (2)The Steadman Clinic, Vail, CO 81657, USA. (3)Department for Shoulder and Elbow Surgery, Center for Musculoskeletal Surgery, Charite-University Medicine Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 14195 Berlin, Germany. (4)Preclinical Surgical Research Laboratory, Department of Clinica
Roflumilast Attenuates Microglial Senescence and Retinal Inflammatory Neurodegeneration Post Retinal Ischemia … HIGH▼
1. Invest Ophthalmol Vis Sci. 2024 Oct 1;65(12):38. doi: 10.1167/iovs.65.12.38. Roflumilast Attenuates Microglial Senescence and Retinal Inflammatory Neurodegeneration Post Retinal Ischemia Reperfusion Injury Through Inhibiting NLRP3 Inflammasome. Ou C(1)(2), Lin Y(3), Wen J(4), Zhang H(3), Xu Y(5), Zhang N(3), Liu Q(3), Wu Y(3), Xu J(3), Wu J(1). Author information: (1)Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China. (2)Department of General Practice, Affiliated Qingyuan Hospital, Guangzhou Medical University, Qingyuan People's Hospital, Qingyuan, Guangdong, China. (3)Department of Ophthalmology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China. (4)Department of Ophthalmology, Taizhou Central Hospital, T
Whole-body senescent cell clearance alleviates age-related brain inflammation and cognitive impairment in mice… HIGH▼
1. Aging Cell. 2021 Feb;20(2):e13296. doi: 10.1111/acel.13296. Epub 2021 Jan 20. Whole-body senescent cell clearance alleviates age-related brain inflammation and cognitive impairment in mice. Ogrodnik M(1)(2), Evans SA(3), Fielder E(4), Victorelli S(1), Kruger P(1), Salmonowicz H(1), Weigand BM(1)(2), Patel AD(1), Pirtskhalava T(2), Inman CL(2), Johnson KO(2), Dickinson SL(4), Rocha A(3), Schafer MJ(2), Zhu Y(2), Allison DB(4), von Zglinicki T(5), LeBrasseur NK(2), Tchkonia T(2), Neretti N(3), Passos JF(1)(2), Kirkland JL(1)(2), Jurk D(1)(2). Author information: (1)Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA. (2)Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA. (3)Department of Molecular Biology, Cell Biology and Bi
Cisplatin and methotrexate induce brain microvascular endothelial and microglial senescence in mouse models of… HIGH▼
1. Geroscience. 2025 Jun;47(3):3447-3459. doi: 10.1007/s11357-025-01560-6. Epub 2025 Feb 20. Cisplatin and methotrexate induce brain microvascular endothelial and microglial senescence in mouse models of chemotherapy-associated cognitive impairment. Csik B(#)(1)(2)(3)(4), Vali Kordestan K(#)(1)(2), Gulej R(#)(1)(2)(4), Patai R(1)(2)(3), Nyul-Toth A(1)(2)(3), Shanmugarama S(1)(2)(3), Mukli P(1)(2)(3)(4), Ungvari A(5), Balsara KE(1), McNall RY(6), Razzaghi T(7), Tarantini S(1)(2)(3)(8)(9), Yabluchanskiy A(1)(2)(3)(8)(9), Ungvari Z(1)(2)(3)(8)(9), Csiszar A(1)(2)(6)(10). Author information: (1)Vascular Cognitive Impairment, Neurodegeneration and Healthy Brain Aging Program, Department of Neurosurgery, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA. (2)Oklahom
Prematurely Aged Human Microglia Exhibit Impaired Stress Response and Defective Nucleocytoplasmic Shuttling of… MEDIUM▼
1. Aging Cell. 2025 Nov;24(11):e70232. doi: 10.1111/acel.70232. Epub 2025 Sep 19. Prematurely Aged Human Microglia Exhibit Impaired Stress Response and Defective Nucleocytoplasmic Shuttling of ALS Associated FUS. Hartmann C(1), Haß C(1), Knobloch M(1), Barrantes I(2), Fumagalli L(3)(4), Premereur J(3)(4), Markert F(5), Peters M(1), Koromila G(1), Hartmann A(6), Jäger K(6), Abel J(1), Mancuso R(3)(4), Storch A(5)(7)(8), Walter M(6), Fuellen G(2), Hermann A(1)(7)(8). Author information: (1)Translational Neurodegeneration Section "Albrecht Kossel", Department of Neurology, Rostock University Medical Center, Rostock, Germany. (2)Institute for Biostatistics and Informatics in Medicine and Aging Research, Rostock University Medical Center, Rostock, Germany. (3)Department of Biomedical S
Disentangling causality in brain aging: The complex interplay between glial senescence, neuroinflammation, and… HIGH▼
1. Exp Neurol. 2026 Mar 21;401:115737. doi: 10.1016/j.expneurol.2026.115737. Online ahead of print. Disentangling causality in brain aging: The complex interplay between glial senescence, neuroinflammation, and neurodegeneration. Suk K(1). Author information: (1)Department of Pharmacology, School of Medicine, Kyungpook National University, Daegu, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu, Republic of Korea; Brain Korea 21 four KNU Convergence Educational Program of Biomedical Sciences for Creative Future Talents, Kyungpook National University, Daegu, Republic of Korea. Electronic address: ksuk@knu.ac.kr. The aging brain is characterized by accumulation of senescent glia, chronic neuroinflammation, and vulnerability to neurode
1. Sci Transl Med. 2022 Sep 7;14(661):eabq0095. doi: 10.1126/scitranslmed.abq0095. Epub 2022 Sep 7. A tetravalent TREM2 agonistic antibody reduced amyloid pathology in a mouse model of Alzheimer's disease. Zhao P(1), Xu Y(2), Jiang L(3), Fan X(1), Li L(1), Li X(1), Arase H(4), Zhao Y(5), Cao W(6), Zheng H(7), Xu H(8)(9), Tong Q(2), Zhang N(1), An Z(1). Author information: (1)Texas Therapeutics Institute, Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX 77030, USA. (2)Center for Metabolic and Degenerative Diseases, Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX 77030, USA. (3)Neuroscience Initiative, Sanford Burnham Prebys Medical Discovery Instit
Adult-onset CNS myelin sulfatide deficiency is sufficient to cause Alzheimer's disease-like neuroinflammation … MEDIUM▼
1. Mol Neurodegener. 2021 Sep 15;16(1):64. doi: 10.1186/s13024-021-00488-7. Adult-onset CNS myelin sulfatide deficiency is sufficient to cause Alzheimer's disease-like neuroinflammation and cognitive impairment. Qiu S(#)(1), Palavicini JP(#)(1)(2), Wang J(1)(3), Gonzalez NS(1), He S(1), Dustin E(4), Zou C(5), Ding L(1)(6), Bhattacharjee A(1), Van Skike CE(1)(7), Galvan V(1)(7), Dupree JL(4)(8), Han X(9)(10). Author information: (1)Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, 4939 Charles Katz Drive, San Antonio, TX, 78229, USA. (2)Division of Diabetes, Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA. (3)Present Address: State Key Lab. of Environmental & Bio
Rescue of a lysosomal storage disorder caused by Grn loss of function with a brain penetrant progranulin biolo… MEDIUM▼
1. Cell. 2021 Sep 2;184(18):4651-4668.e25. doi: 10.1016/j.cell.2021.08.002. Epub 2021 Aug 26. Rescue of a lysosomal storage disorder caused by Grn loss of function with a brain penetrant progranulin biologic. Logan T(1), Simon MJ(1), Rana A(1), Cherf GM(1), Srivastava A(1), Davis SS(1), Low RLY(1), Chiu CL(1), Fang M(1), Huang F(1), Bhalla A(1), Llapashtica C(1), Prorok R(1), Pizzo ME(1), Calvert MEK(1), Sun EW(1), Hsiao-Nakamoto J(1), Rajendra Y(1), Lexa KW(1), Srivastava DB(1), van Lengerich B(1), Wang J(1), Robles-Colmenares Y(1), Kim DJ(1), Duque J(1), Lenser M(1), Earr TK(1), Nguyen H(1), Chau R(1), Tsogtbaatar B(1), Ravi R(1), Skuja LL(1), Solanoy H(1), Rosen HJ(2), Boeve BF(3), Boxer AL(2), Heuer HW(2), Dennis MS(1), Kariolis MS(1), Monroe KM(1), Przybyla L(1), Sanchez PE
CD300f immune receptor contributes to healthy aging by regulating inflammaging, metabolism, and cognitive decl… MEDIUM▼
1. Cell Rep. 2023 Oct 31;42(10):113269. doi: 10.1016/j.celrep.2023.113269. CD300f immune receptor contributes to healthy aging by regulating inflammaging, metabolism, and cognitive decline. Evans F(1), Alí-Ruiz D(2), Rego N(3), Negro-Demontel ML(1), Lago N(2), Cawen FA(2), Pannunzio B(1), Sanchez-Molina P(4), Reyes L(5), Paolino A(5), Rodríguez-Duarte J(6), Pérez-Torrado V(7), Chicote-González A(8), Quijano C(9), Marmisolle I(9), Mulet AP(10), Schlapp G(10), Meikle MN(10), Bresque M(7), Crispo M(10), Savio E(5), Malagelada C(8), Escande C(7), Peluffo H(11). Author information: (1)Department of Histology and Embryology, Faculty of Medicine, UDELAR, Montevideo, Uruguay; Neuroinflammation and Gene Therapy Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay. (2)Neuroinfla
1. Mech Ageing Dev. 2021 Dec;200:111575. doi: 10.1016/j.mad.2021.111575. Epub 2021 Oct 1. Brain aging mechanisms with mechanical manifestations. Blinkouskaya Y(1), Caçoilo A(1), Gollamudi T(2), Jalalian S(1), Weickenmeier J(3). Author information: (1)Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, United States. (2)Department of Biomedical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, United States. (3)Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, United States. Electronic address: johannes.weickenmeier@stevens.edu. Brain aging is a complex process that affects everything from the subcellular to the organ level, begins early in life, and accelerates with age. Morphologically
1. Aging Cell. 2023 May;22(5):e13817. doi: 10.1111/acel.13817. Epub 2023 Mar 23. Effect of peripheral cellular senescence on brain aging and cognitive decline. Budamagunta V(1)(2)(3), Kumar A(1), Rani A(1), Bean L(1), Manohar-Sindhu S(2), Yang Y(3)(4), Zhou D(4), Foster TC(1)(2). Author information: (1)Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, Florida, USA. (2)Genetics and Genomics Graduate Program, Genetics Institute, University of Florida, Gainesville, Florida, USA. (3)Department of Pharmacodynamics, College of Pharmacy, University of Florida, Gainesville, Florida, USA. (4)Department of Biochemistry and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA. We examine similar and diff
1. CNS Neurol Disord Drug Targets. 2013 Sep;12(6):763-7. doi: 10.2174/18715273113126660176. Microglial senescence. Streit WJ(1), Xue QS. Author information: (1)Department of Neuroscience, PO Box 100244, University of Florida, Gainesville, FL 32610-0244, USA. pschorr@ufl.edu. In order to understand microglial senescence it is important to also understand neuroinflammation because the distinction between senescent and activated microglia is a fine one to make and not always made easily. Indeed, it is not easy to reliably identify activated microglia which is why we spend some effort here discussing intricacies associated with both acute and chronic neuroinflammation before addressing the subject of microglial senescence. The idea of microglial senescence in the context of aging-r
TREM2 deficiency delays postnatal microglial maturation and synaptic pruning, leading to anxiety-like behavior…▼
TREM2-mediated microglial phagocytosis of inhibitory synapses contributes to prolonged FS-induced epileptogene… MODERATE▼
A scalable human-zebrafish xenotransplantation model reveals gastrosome-mediated processing of dying neurons b… MODERATE▼
✗ Opposing Evidence 18
Microglia are tissue-resident macrophages of the central nervous system (CNS). In the CNS, microglia play an important role in the monitoring and intervention of synaptic and neuron-level activities. Interventions targeting microglia have been shown to improve the prognosis of various neurological diseases. Recently, studies have observed the activation of microglia in different cardiovascular diseases. In addition, different approaches that regulate the activity of microglia have been shown to
Triggering receptor expressed on myeloid cells 2 (TREM2) has been suggested to play a crucial role in Alzheimer's disease (AD) pathogenesis, as revealed by genome-wide association studies (GWAS). Since then, rapidly increasing literature related to TREM2 has focused on elucidating its role in AD pathology. In this review, we summarize our understanding of TREM2 biology, explore TREM2 functions in microglia, address the multiple mechanisms of TREM2 in AD, and raise key questions for further inves
Microglial research has advanced considerably in recent decades yet has been constrained by a rolling series of dichotomies such as "resting versus activated" and "M1 versus M2." This dualistic classification of good or bad microglia is inconsistent with the wide repertoire of microglial states and functions in development, plasticity, aging, and diseases that were elucidated in recent years. New designations continuously arising in an attempt to describe the different microglial states, notably
TREM2 deficiency attenuates neuroinflammation and protects against neurodegeneration in a mouse model of tauop… MEDIUM▼
Variants in the gene encoding the triggering receptor expressed on myeloid cells 2 (TREM2) were recently found to increase the risk for developing Alzheimer's disease (AD). In the brain, TREM2 is predominately expressed on microglia, and its association with AD adds to increasing evidence implicating a role for the innate immune system in AD initiation and progression. Thus far, studies have found
Loss-of-function TREM2 mutations strongly increase Alzheimer's disease (AD) risk. Trem2 deletion has revealed protective Trem2 functions in preclinical models of β-amyloidosis, a prominent feature of pre-diagnosis AD stages. How TREM2 influences later AD stages characterized by tau-mediated neurodegeneration is unclear. To understand Trem2 function in the context of both β-amyloid and tau patholog
Recent studies have begun to reveal critical roles for the brain's professional phagocytes, microglia, and their receptors in the control of neurotoxic amyloid beta (Aβ) and myelin debris accumulation in neurodegenerative disease. However, the critical intracellular molecules that orchestrate neuroprotective functions of microglia remain poorly understood. In our studies, we find that targeted del
Cognitive enhancement and neuroprotective effects of OABL, a sesquiterpene lactone in 5xFAD Alzheimer's diseas… MEDIUM▼
Alzheimer's disease (AD) is a neurodegenerative disease in which oxidative stress and neuroinflammation were demonstrated to be associated with neuronal loss and cognitive deficits. However, there are still no specific treatments that can prevent the progression of AD. In this study, a screening of anti-inflammatory hits from 4207 natural compounds of two different molecular libraries indicated 1,
Previous studies suggest glial and neuronal changes may trigger synaptic dysfunction in Alzheimer's disease (AD), but the link between their markers and synaptic abnormalities in the living brain remains unclear. We investigated the association between glial reactivity and synaptic dysfunction biomarkers in cerebrospinal fluid (CSF) from 478 individuals in cognitively unimpaired (CU) and cognitive
Sulfatide deficiency-induced astrogliosis and myelin lipid dyshomeostasis are independent of TREM2-mediated mi… MEDIUM▼
Disrupted lipid homeostasis and neuroinflammation often co-exist in neurodegenerative disorders, including Alzheimer's disease (AD). However, the intrinsic connection and causal relationship between these deficits remain elusive. Our previous studies show that the loss of sulfatide (ST), a class of myelin-enriched lipids, causes AD-like neuroinflammatory responses, cognitive impairment, bladder en
Low-grade inflammation is a hallmark of old age and a central driver of ageing-associated impairment and disease
Single-Cell RNA Sequencing of Microglia throughout the Mouse Lifespan and in the Injured Brain Reveals Complex… MEDIUM▼
Microglia, the resident immune cells of the brain, rapidly change states in response to their environment, but we lack molecular and functional signatures of different microglial populations. Here, we analyzed the RNA expression patterns of more than 76,000 individual microglia in mice during development, in old age, and after brain injury. Our analysis uncovered at least nine transcriptionally di
1. Adv Clin Exp Med. 2025 May;34(5):673-679. doi: 10.17219/acem/204107. Lectins and neurodegeneration: A glycobiologist's perspective. Olejnik B(1), Ferens-Sieczkowska M(1). Author information: (1)Department of Biochemistry and Immunochemistry, Wroclaw Medical University, Poland. Neurodegenerative diseases, including Alzheimer's and Parkinson's disease, affect an increasing number of people in aging societies, dramatically reducing the quality of life of those affected. Hence, intensive research efforts are aimed at understanding the molecular mechanisms of the disease progress, with the hope for developing effective therapeutic strategies. The progress of neurodegenerative diseases is associated with a complex activity of the immune system in the brain tissue. Carbohydrate-bind
1. J Neurol. 2025 Sep 24;272(10):651. doi: 10.1007/s00415-025-13384-7. Effect of aging on biomarkers and clinical profile in Parkinson's disease. Di Lazzaro G(1)(2), Paolini Paoletti F(3), Bellomo G(3), Schirinzi T(4), Grillo P(5)(6), Giuffrè GM(7)(8), Petracca M(7)(8), Picca A(7)(9), Mercuri NB(4), Parnetti L(3), Calabresi P(7)(8), Bentivoglio AR(7)(8). Author information: (1)Neurology Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Largo Agostino Gemelli 8, 00168, Rome, Italy. giulia.dilazzaro@policlinicogemelli.it. (2)Università Cattolica del Sacro Cuore, Rome, Italy. giulia.dilazzaro@policlinicogemelli.it. (3)Section of Neurology, Department of Medicine and Surgery, University Hospital of Perugia, Perugia, Italy. (4)Neurology Unit, Department of Systems Medi
Regulation of TREM2 expression by transcription factor YY1 and its protective effect against Alzheimer's disea… MEDIUM▼
1. J Biol Chem. 2023 May;299(5):104688. doi: 10.1016/j.jbc.2023.104688. Epub 2023 Apr 11. Regulation of TREM2 expression by transcription factor YY1 and its protective effect against Alzheimer's disease. Lu Y(1), Huang X(1), Liang W(1), Li Y(1), Xing M(2), Pan W(2), Zhang Y(1), Wang Z(3), Song W(4). Author information: (1)The National Clinical Research Center for Geriatric Disease, Xuanwu Hospital, Capital Medical University, Beijing, China. (2)Zhejiang Provincial Clinical Research Center for Mental Disorders, School of Mental Health and The Affiliated Wenzhou Kangning Hospital, Institute of Aging, Key Laboratory of Alzheimer's Disease of Zhejiang Province, Wenzhou Medical University, Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou,
1. Int J Mol Sci. 2025 Nov 27;26(23):11494. doi: 10.3390/ijms262311494. Microglia in Brain Aging and Age-Related Diseases: Friends or Foes? Ishikawa K(1), Fujikawa R(1), Okita K(1), Kimura F(1), Watanabe T(1), Katsurabayashi S(1), Iwasaki K(1). Author information: (1)Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan. With the global rise in population aging, establishing effective strategies for the prevention and treatment of age-related neurodegenerative diseases, as well as their prodromal stage of cognitive frailty, has become an urgent challenge. Recent studies have revealed that the neural basis of both frailty and age-related disorders is closely associated with chronic neuroinflammat
Rejuvenating aged microglia by p16(ink4a)-siRNA-loaded nanoparticles increases amyloid-β clearance in animal m… MEDIUM▼
1. Mol Neurodegener. 2024 Mar 16;19(1):25. doi: 10.1186/s13024-024-00715-x. Rejuvenating aged microglia by p16(ink4a)-siRNA-loaded nanoparticles increases amyloid-β clearance in animal models of Alzheimer's disease. Shin HJ(1)(2), Kim IS(3)(4), Choi SG(1)(2), Lee K(1)(3)(5), Park H(1)(3), Shin J(1)(3), Kim D(1), Beom J(5), Yi YY(6), Gupta DP(7), Song GJ(7)(8), Chung WS(9), Lee CJ(10)(11), Kim DW(12)(13)(14)(15). Author information: (1)Department of Anatomy and Cell Biology, Chungnam National University College of Medicine, Daejeon, Republic of Korea. (2)Brain Research Institute, Chungnam National University College of Medicine, Daejeon, Republic of Korea. (3)Department of Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea. (4)Department o
1. Aging Dis. 2025 Oct 22. doi: 10.14336/AD.2025.1066. Online ahead of print. Microglial Replacement Reverses Age-Associated Epigenetic Modifications Despite Accelerating Epigenetic Age. Arbaizar-Rovirosa M(1)(2), Pérez RF(3), Peñarroya A(4)(5)(6)(7), Gallizioli M(1), Fraga MF(8)(4)(5)(9)(10), Planas AM(1)(2). Author information: (1)Cerebrovascular Research Laboratory, Instituto de Investigaciones. (2)Biomédicas de Barcelona (IIBB), Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain. Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. (3)Departamento de Bioquímica y Biología Molecular, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain. (4)Cancer Epigenetics and Nanomedicine Laboratory, Centro de Investi
1. Front Cell Neurosci. 2013 Mar 13;7:22. doi: 10.3389/fncel.2013.00022. eCollection 2013. Microglial aging in the healthy CNS: phenotypes, drivers, and rejuvenation. Wong WT(1). Author information: (1)Unit on Neuron-Glia Interactions in Retinal Disease, National Eye Institute, National Institutes of Health Bethesda, MD, USA. Neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease, and age-related macular degeneration (AMD), share two characteristics in common: (1) a disease prevalence that increases markedly with advancing age, and (2) neuroinflammatory changes in which microglia, the primary resident immune cell of the CNS, feature prominently. These characteristics have led to the hypothesis that pathogenic mechanisms underlying age-related neurodegenerati
🧬 Theorist Proposes novel mechanisms and generates creative hypotheses ▼
Based on my research, I'll now generate novel therapeutic hypotheses focused on aging-related gene expression changes that predict neurodegenerative vulnerability. Here are 6 evidence-based therapeutic hypotheses:
Novel Therapeutic Hypotheses for Aging-Neurodegeneration Vulnerability
1. AP1S1-Mediated Vesicular Transport Restoration
Description: Age-related downregulation of AP1S1 (adaptor protein complex 1 sigma 1) disrupts clathrin-mediated vesicular transport, creating vulnerability to amyloid-β and oxidative stress. Therapeutic restoration of AP1S1 function through small
🔍 Skeptic Identifies weaknesses, alternative explanations, and methodological concerns ▼
Critical Evaluation of Therapeutic Hypotheses
I'll provide a rigorous critique of each hypothesis, identifying weaknesses and counter-evidence:
1. AP1S1-Mediated Vesicular Transport Restoration
Major Weaknesses:
- Single pathway oversimplification: The hypothesis assumes AP1S1 is a primary driver when vesicular transport involves hundreds of proteins with redundant functions
- Lack of specificity evidence: No evidence provided that AP1S1 downregulation is specific to vulnerable neurons vs. normal aging
- Therapeutic feasibility unclear: No demonstration that AP1S1
🎯 Domain Expert Assesses practical feasibility, druggability, and clinical translation ▼
Practical Feasibility Assessment of Therapeutic Hypotheses
Based on my analysis of druggability, existing compounds, competitive landscape, and development considerations, here's my comprehensive assessment:
1. AP1S1-Mediated Vesicular Transport Restoration
Druggability: POOR (2/10)
- Target Type: Adaptor protein complex component - notoriously difficult to drug
- Structure: No available crystal structure for rational drug design
- Chemical Matter: No known small molecule modulators of AP1S1 function
- Mechanism: Requires enhancing protein-protein interactio
⚖ Synthesizer Integrates perspectives and produces final ranked assessments ▼
Based on my synthesis of the Theorist's hypotheses, Skeptic's critiques, and Expert's feasibility assessment, here's the final JSON output:
Price History
| Event | Price | Change | Source | Time | |
|---|---|---|---|---|---|
| ⚖ | Recalibrated | $0.612 | 2026-04-12 18:34 |
Clinical Trials (5) Relevance: 26%
Active
Completed
Total Enrolled
Highest Phase
📚 Cited Papers (54)
📓 Linked Notebooks (1)
⚔ Arena Performance
Origin
Wiki Pages
KG Entities (125)
Related Hypotheses
Estimated Development
🧪 Falsifiable Predictions
Knowledge Subgraph (216 edges)
associated with (14)
catalyzes (1)
causes (27-hydroxycholesterol promotes oligodendrocyte mat) (1)
causes (APP overexpression causes selective vulnerability ) (1)
causes (CXCL10 acts as chemokine to recruit cytotoxic CD8+) (1)
causes (CXCL10 antagonists would preserve white matter int) (1)
causes (NAD+ supplementation improves mitophagy and mitoch) (1)
causes (NOMO1 function improves endoplasmic reticulum home) (1)
causes (STING activation leads to cellular senescence and ) (1)
causes (activated TNFRSF25 accelerates cognitive decline i) (1)
causes (age-related CD300f dysfunction allows excessive ne) (1)
causes (age-related activation of cGAS-STING drives microg) (1)
causes (age-related cytokine secretion specifically suppre) (1)
causes (age-related decline in microglial profilin-1 disru) (1)
causes (age-related downregulation of AP1S1 disrupts clath) (1)
causes (aged brain exosomes specifically activate neuronal) (1)
causes (aging activation of microglia leads to increased C) (1)
causes (aging causes early transcriptomic changes in oligo) (1)
causes (aging mitochondrial dysfunction triggers STING pat) (1)
causes (creates a feed-forward loop of neuroinflammation l) (1)
causes (disrupted cytoskeletal checkpoints lead to prematu) (1)
causes (disrupted endosomal-lysosomal trafficking creates ) (1)
causes (dysregulated microglial transitions fail to suppor) (1)
causes (early proteasome downregulation and dysfunction dr) (1)
causes (enhanced ACE expression in microglia increases Aβ ) (1)
causes (iron-dependent ferroptosis contributes to α-synucl) (1)
causes (loss of sulfatides removes suppression of microgli) (1)
causes (microglia activate CXCL10-mediated recruitment of ) (1)
causes (microglial ACE enhancement activates spleen tyrosi) (1)
causes (microglial activation orchestrates CXCL10-mediated) (1)
causes (proteostasis failure leads to protein aggregation ) (1)
causes (recruited CD8+ T cells promote aging-related white) (1)
causes (recruited CD8+ T cells promote white matter degene) (1)
causes (selective CXCR3 blockade could preserve white matt) (1)
causes (senescence creates a self-perpetuating cycle by pr) (1)
causes (suppressed mitochondrial function creates vulnerab) (1)
causes (tau aggregation triggers cellular senescence respo) (1)
codes for subunit (1)
contributes to (1)
controls (1)
damages (1)
enhances (1)
implicated in (20)
increases (1)
induces (1)
inhibits (1)
involved in (1)
maintains (1)
mediates (1)
modulates (1)
participates in (1)
promotes (3)
recruits (1)
suppresses (1)
targets (20)
Mechanism Pathway for SMPD1
Molecular pathway showing key causal relationships underlying this hypothesis
graph TD
CXCL10["CXCL10"] -->|causes (CXCL10 act| CD8__T_cell_recruitment["CD8+ T cell recruitment"]
CD8__T_cell_recruitment_1["CD8+ T cell recruitment"] -->|causes (recruited | white_matter_degeneration["white matter degeneration"]
aging["aging"] -->|causes (aging caus| oligodendrocyte_dysfuncti["oligodendrocyte dysfunction"]
microglial_activation["microglial activation"] -->|causes (microglial| CXCL10_production["CXCL10 production"]
CXCL10_inhibition["CXCL10 inhibition"] -->|causes (CXCL10 ant| white_matter_preservation["white matter preservation"]
cGAS_STING_pathway_activa["cGAS-STING pathway activation"] -->|causes (age-relate| microglial_senescence["microglial senescence"]
microglial_senescence_2["microglial senescence"] -->|causes (creates a | neurodegeneration_vulnera["neurodegeneration vulnerability"]
ACE_enhancement["ACE enhancement"] -->|causes (enhanced A| amyloid___clearance["amyloid-β clearance"]
ACE_enhancement_3["ACE enhancement"] -->|causes (microglial| spleen_tyrosine_kinase_si["spleen tyrosine kinase signaling"]
aging_activated_microglia["aging-activated microglia"] -->|causes (aging acti| CXCL10_production_4["CXCL10 production"]
CD8__T_cell_recruitment_5["CD8+ T cell recruitment"] -->|causes (recruited | oligodendrocyte_damage["oligodendrocyte damage"]
microglial_CXCL10_product["microglial CXCL10 production"] -->|causes (microglia | CD8__T_cell_recruitment_6["CD8+ T cell recruitment"]
style CXCL10 fill:#4fc3f7,stroke:#333,color:#000
style CD8__T_cell_recruitment fill:#4fc3f7,stroke:#333,color:#000
style CD8__T_cell_recruitment_1 fill:#4fc3f7,stroke:#333,color:#000
style white_matter_degeneration fill:#ef5350,stroke:#333,color:#000
style aging fill:#4fc3f7,stroke:#333,color:#000
style oligodendrocyte_dysfuncti fill:#4fc3f7,stroke:#333,color:#000
style microglial_activation fill:#4fc3f7,stroke:#333,color:#000
style CXCL10_production fill:#4fc3f7,stroke:#333,color:#000
style CXCL10_inhibition fill:#4fc3f7,stroke:#333,color:#000
style white_matter_preservation fill:#4fc3f7,stroke:#333,color:#000
style cGAS_STING_pathway_activa fill:#81c784,stroke:#333,color:#000
style microglial_senescence fill:#4fc3f7,stroke:#333,color:#000
style microglial_senescence_2 fill:#4fc3f7,stroke:#333,color:#000
style neurodegeneration_vulnera fill:#ef5350,stroke:#333,color:#000
style ACE_enhancement fill:#4fc3f7,stroke:#333,color:#000
style amyloid___clearance fill:#4fc3f7,stroke:#333,color:#000
style ACE_enhancement_3 fill:#4fc3f7,stroke:#333,color:#000
style spleen_tyrosine_kinase_si fill:#81c784,stroke:#333,color:#000
style aging_activated_microglia fill:#4fc3f7,stroke:#333,color:#000
style CXCL10_production_4 fill:#4fc3f7,stroke:#333,color:#000
style CD8__T_cell_recruitment_5 fill:#4fc3f7,stroke:#333,color:#000
style oligodendrocyte_damage fill:#4fc3f7,stroke:#333,color:#000
style microglial_CXCL10_product fill:#4fc3f7,stroke:#333,color:#000
style CD8__T_cell_recruitment_6 fill:#4fc3f7,stroke:#333,color:#000
3D Protein Structure
🧬 SMPD1 — PDB 5I85 Click to expand 3D viewer
Source Analysis
Gene expression changes in aging mouse brain predicting neurodegenerative vulnerability
neurodegeneration | 2026-04-03 | completed