ID: h-58e4635a
Hypothesis
SASP-Mediated Complement Cascade Amplification
SASP-Mediated Complement Cascade Amplification starts from the claim that modulating C1Q/C3 within the disease context of neurodegeneration can redirect a disease-relevant process.
EvidenceStrong (75%)📖 38 cit🗣 3 debates✓ 20 support✗ 10 oppose
✓ All Quality Gates Passed
🧪 Overview
Mechanistic Overview
SASP-Mediated Complement Cascade Amplification starts from the claim that modulating C1Q/C3 within the disease context of neurodegeneration can redirect a disease-relevant process. The original description reads: "SASP-Mediated Complement Cascade Amplification in Alzheimer's Disease Overview: Senescence, Inflammation, and Synaptic Loss Cellular senescence—a state of irreversible growth arrest accompanied by a pro-inflammatory secretome—accumulates dramatically with age and in Alzheimer's disease. Senescent astrocytes and microglia secrete the senescence-associated secretory phenotype (SASP), a cocktail of cytokines, chemokines, proteases, and critically, complement cascade initiators including C1q, C3, and C4. This creates focal zones of complement activation that "tag" healthy synapses for elimination by microglia through a process called complement-mediated synaptic pruning—a physiological mechanism during development that becomes pathologically reactivated in neurodegeneration....
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
graph TD
A["Cellular Senescence<br/>Astrocytes and Microglia"] -->|"Triggers"| B["SASP Activation<br/>Senescence-Associated<br/>Secretory Phenotype"]
B -->|"Secretes"| C["Pro-inflammatory<br/>Cytokines<br/>IL-1beta, TNF-alpha, IL-6"]
B -->|"Releases"| D["Complement Initiators<br/>C1q, C3, C4"]
B -->|"Produces"| E["Chemokines and<br/>Matrix Proteases<br/>CCL2, MMP3"]
D -->|"Activates"| F["Classical Complement<br/>Pathway Initiation<br/>C1q-C1r-C1s Complex"]
F -->|"Cleaves"| G["C4 and C2<br/>Formation of<br/>C3 Convertase C4b2a"]
G -->|"Amplifies"| H["C3 Cleavage<br/>C3a and C3b<br/>Generation"]
H -->|"Forms"| I["C5 Convertase<br/>C4b2a3b Complex<br/>Alternative Pathway Feed-in"]
I -->|"Generates"| J["C5a Anaphylatoxin<br/>Microglial<br/>Chemotaxis Signal"]
I -->|"Initiates"| K["Terminal Pathway<br/>C5b-9 Membrane<br/>Attack Complex"]
H -->|"Opsonizes"| L["Synaptic Tagging<br/>C3b Deposition on<br/>Neuronal Synapses"]
L -->|"Recognized by"| M["Microglial CR3<br/>Complement Receptor 3<br/>CD11b-CD18"]
M -->|"Triggers"| N["Complement-Mediated<br/>Synaptic Pruning<br/>Phagocytosis"]
J -->|"Activates"| O["Microglial Migration<br/>and Activation<br/>M1 Polarization"]
O -->|"Enhances"| N
C -->|"Amplifies"| O
N -->|"Results in"| P["Progressive Synapse Loss<br/>Before Plaque Formation<br/>Early AD Pathology"]
P -->|"Leads to"| Q["Cognitive Decline<br/>Memory Impairment<br/>Neurodegeneration"]
R["Therapeutic C1q-C3<br/>Inhibition in SASP<br/>Microenvironments"] -->|"Blocks"| D
R -->|"Prevents"| F
classDef normal fill:#4fc3f7,stroke:#2196f3,color:#0d0d1a
classDef therapeutic fill:#81c784,stroke:#4caf50,color:#0d0d1a
classDef pathology fill:#ef5350,stroke:#f44336,color:#0d0d1a
classDef outcome fill:#ffd54f,stroke:#ff9800,color:#0d0d1a
classDef molecular fill:#ce93d8,stroke:#9c27b0,color:#0d0d1a
class A,B,C,D,E normal
class F,G,H,I,J,K,L,M molecular
class N,O,P pathology
class Q outcome
class R therapeutic🎨 AI Visual Cardhypothesis_visual
⚖️ Evidence
⚖️ Evidence Matrix20 supports10 contradicts
Supports
C1q and C3 mediate early synapse loss in AD mouse models; C1q/C3 knockout preserves synapses
Abstract
Synapse loss in Alzheimer's disease (AD) correlates with cognitive decline. Involvement of microglia and complement in AD has been attributed to neuroinflammation, prominent late in disease. Here we show in mouse models that complement and microglia mediate synaptic loss early in AD. C1q, the initiating protein of the classical complement cascade, is increased and associated with synapses before overt plaque deposition. Inhibition of C1q, C3, or the microglial complement receptor CR3 reduces the number of phagocytic microglia, as well as the extent of early synapse loss. C1q is necessary for the toxic effects of soluble β-amyloid (Aβ) oligomers on synapses and hippocampal long-term potentiation. Finally, microglia in adult brains engulf synaptic material in a CR3-dependent process when exposed to soluble Aβ oligomers. Together, these findings suggest that the complement-dependent pathway and microglia that prune excess synapses in development are inappropriately activated and mediate s
Supports
CR3 (CD11b/CD18) on microglia mediates complement-tagged synapse phagocytosis
Abstract
Microglia are the resident macrophages of the central nervous system. Microglia possess varied morphologies and functions. Under normal physiological conditions, microglia mainly exist in a resting state and constantly monitor their microenvironment and survey neuronal and synaptic activity. Through the C1q, C3 and CR3 "Eat Me" and CD47 and SIRPα "Don't Eat Me" complement pathways, as well as other pathways such as CX3CR1 signaling, resting microglia regulate synaptic pruning, a process crucial for the promotion of synapse formation and the regulation of neuronal activity and synaptic plasticity. By mediating synaptic pruning, resting microglia play an important role in the regulation of experience-dependent plasticity in the barrel cortex and visual cortex after whisker removal or monocular deprivation, and also in the regulation of learning and memory, including the modulation of memory strength, forgetfulness, and memory quality. As a response to brain injury, infection or neuroinfl
Supports
Senescent astrocytes secrete high levels of C1q and C3 as part of SASP in aged and AD brains
Abstract
Predisposition to Alzheimer's disease (AD) may arise from lipid metabolism perturbation, however, the underlying mechanism remains elusive. Here, we identify ATPase family AAA-domain containing protein 3A (ATAD3A), a mitochondrial AAA-ATPase, as a molecular switch that links cholesterol metabolism impairment to AD phenotypes. In neuronal models of AD, the 5XFAD mouse model and post-mortem AD brains, ATAD3A is oligomerized and accumulated at the mitochondria-associated ER membranes (MAMs), where it induces cholesterol accumulation by inhibiting gene expression of CYP46A1, an enzyme governing brain cholesterol clearance. ATAD3A and CYP46A1 cooperate to promote APP processing and synaptic loss. Suppressing ATAD3A oligomerization by heterozygous ATAD3A knockout or pharmacological inhibition with DA1 restores neuronal CYP46A1 levels, normalizes brain cholesterol turnover and MAM integrity, suppresses APP processing and synaptic loss, and consequently reduces AD neuropathology and cognitive
Supports
Senolytic treatment reduces brain C1q/C3 levels and preserves synaptic density in APP/PS1 mice
Abstract
Adenosine monophosphate-activated protein kinase (AMPK) activity is stimulated to promote metabolic adaptation upon energy stress. However, sustained metabolic stress may cause cell death. The mechanisms by which AMPK dictates cell death are not fully understood. We report that metabolic stress promoted receptor-interacting protein kinase 1 (RIPK1) activation mediated by TRAIL receptors, whereas AMPK inhibited RIPK1 by phosphorylation at Ser415 to suppress energy stress-induced cell death. Inhibiting pS415-RIPK1 by Ampk deficiency or RIPK1 S415A mutation promoted RIPK1 activation. Furthermore, genetic inactivation of RIPK1 protected against ischemic injury in myeloid Ampkα1-deficient mice. Our studies reveal that AMPK phosphorylation of RIPK1 represents a crucial metabolic checkpoint, which dictates cell fate response to metabolic stress, and highlight a previously unappreciated role for the AMPK-RIPK1 axis in integrating metabolism, cell death, and inflammation.
Supports
Complement C1q/C3-CR3 pathway mediates abnormal microglial synaptic pruning in neurodegeneration
Abstract
BACKGROUND: Both functional brain imaging studies and autopsy reports have indicated the presence of synaptic loss in the brains of depressed patients. The activated microglia may dysfunctionally engulf neuronal synapses, leading to synaptic loss and behavioral impairments in depression. However, the mechanisms of microglial-synaptic interaction under depressive conditions remain unclear. METHODS: We utilized lipopolysaccharide (LPS) to induce a mouse model of depression, examining the effects of LPS on behaviors, synapses, microglia, microglial phagocytosis of synapses, and the C1q/C3-CR3 complement signaling pathway. Additionally, a C1q neutralizing antibody was employed to inhibit the C1q/C3-CR3 signaling pathway and assess its impact on microglial phagocytosis of synapses and behaviors in the mice. RESULTS: LPS administration resulted in depressive and anxiety-like behaviors, synaptic loss, and abnormal microglial phagocytosis of synapses in the hippocampal dentate gyrus (DG) of mi
Supports
Anti-C1q antibody ANX005 shows target engagement and synapse preservation in preclinical AD models
Abstract
Parkinson's disease (PD) is a neurodegenerative disease characterized by the death of dopaminergic neurons in the substantia nigra and the formation of Lewy bodies that are composed of aggregated α-synuclein (α-Syn). However, the factors that regulate α-Syn pathology and nigrostriatal dopaminergic degeneration remain poorly understood. Previous studies demonstrate cholesterol 24-hydroxylase (CYP46A1) increases the risk for PD. Moreover, 24-hydroxycholesterol (24-OHC), a brain-specific oxysterol that is catalyzed by CYP46A1, is elevated in the cerebrospinal fluid of PD patients. Herein, we show that the levels of CYP46A1 and 24-OHC are elevated in PD patients and increase with age in a mouse model. Overexpression of CYP46A1 intensifies α-Syn pathology, whereas genetic removal of CYP46A1 attenuates α-Syn neurotoxicity and nigrostriatal dopaminergic degeneration in the brain. Moreover, supplementation with exogenous 24-OHC exacerbates the mitochondrial dysfunction induced by α-Syn fibrils
Supports
Senescent astrocytes upregulate C3 complement by 8-fold, driving microglial activation and synaptic elimination in aging mouse brain
Abstract
BACKGROUND: Inflammatory bowel disease (IBD) is a chronic relapsing disease that requires evaluation using multiple objective tools. In Europe, bowel ultrasound (US) is a widely accepted modality used for the management of patients with IBD; however, its use in North America has only recently emerged as a potential technique. OBJECTIVES: Our goal was to identify current practice patterns of pediatric gastroenterologists and radiologists using bowel US in patients with IBD and highlight perceived limitations to the widespread adoption of this modality in North America. METHODS: A 14-question survey was e-mailed to the North American Society for Pediatric Gastroenterology, Hepatology, and Nutrition internet bulletin board composed of 3,058 subscribers from 51 countries; the Society of Pediatric Radiology listserv composed of 1,917 subscribers worldwide; and the Society of Chairs of Radiology at Children's Hospitals listserv. Descriptive summary statistics was used. RESULTS: In North Amer
Supports
SASP factor IL-6 directly activates complement C3 transcription via STAT3 in human astrocytes, creating a feed-forward inflammatory loop
Abstract
Host-guest complexes between native cyclodextrins (α-, β- and γ-CD) and hybrid Lindqvist-type polyoxovanadates (POVs) [V6 O13 ((OCH2 )3 C-R)2 ]2- with R = CH2 CH3 , NO2 , CH2 OH and NH(BOC) (BOC = N-tert-butoxycarbonyl) were studied in aqueous solution. Six crystal structures determined by single-crystal X-ray diffraction analysis revealed the nature of the functional R group strongly influences the host-guest conformation and also the crystal packing. In all systems isolated in the solid-state, the organic groups R are embedded within the cyclodextrin cavities, involving only a few weak supramolecular contacts. The interaction between hybrid POVs and the macrocyclic organic hosts have been deeply studied in solution using ITC, cyclic voltammetry and NMR methods (1D 1 H NMR, and 2D DOSY, and ROESY). This set of complementary techniques provides clear insights about the strength of interactions and the binding host-guest modes occurring in aqueous solution, highlighting a dramatic influ
Supports
Single-cell RNA-seq reveals senescent microglia-astrocyte complement circuits enriched in AD hippocampus compared to age-matched controls
Abstract
BACKGROUND: The aim of this study was to assess whether satellite blood culture (SBC) can improve turnaround times, antibiotic switching, and patient prognosis, relative to laboratory blood culture (LBC). . METHODS: Patients with sepsis treated in the intensive care units (ICUs) of Henan Provincial People's Hospital from February 5, 2018 to January 19, 2019 who met the inclusion criteria were recruited to the study and divided into the SBC group and LBC group according to different blood culture methods. Patient demographics, blood culture, antibiotic adjustment, and prognosis data were collected and compared between the two groups. . RESULTS: A total of 204 blood culture sets from 52 ICU patients, including 100 from the medical microbiology LBC group and 104 from the SBC group, were analyzed in this study. There was no significant difference in the positive rates between the two groups. Time from specimen collection to incubation was significantly shorter in the SBC group than that
Supports
Senolytic ABT-263 treatment reduces complement C1q and C3 deposition at synapses by 45% in P301S tau mice
Abstract
[This retracts the article DOI: 10.1155/2022/3737137.].
Supports
Botulinum Neurotoxin Induces Neurotoxic Microglia Mediated by Exogenous Inflammatory Responses.
Abstract
Botulinum neurotoxin serotype A (BoNT/A) is widely used in therapeutics and cosmetics. The effects of multi-dosed BoNT/A treatment are well documented on the peripheral nervous system (PNS), but much less is known on the central nervous system (CNS). Here, the mechanism of multi-dosed BoNT/A leading to CNS neurodegeneration is explored by using the 3D human neuron-glia model. BoNT/A treatment reduces acetylcholine, triggers astrocytic transforming growth factor beta, and upregulates C1q, C3, and C5 expression, inducing microglial proinflammation. The disintegration of the neuronal microtubules is escorted by microglial nitric oxide, interleukin 1β, tumor necrosis factor α, and interleukin 8. The microglial proinflammation eventually causes synaptic impairment, phosphorylated tau (pTau) aggregation, and the loss of the BoNT/A-treated neurons. Taking a more holistic approach, the model will allow to assess therapeutics for the CNS neurodegeneration under the prolonged use of BoNT/A.
Supports
PDE4 inhibition alleviates HMGB1/C1q/C3-mediated excessive phagocytic pruning of synapses by microglia and depressive-like behaviors in mice.
Abstract
Microglial activation and complement-mediated synaptic pruning are involved in depression development. We previously found that the inhibition of phosphodiesterase 4 (PDE4) inhibits microglial activation and increases synaptic plasticity. However, the role of PDE4 in microglia phagocytosis and complement-mediated synaptic pruning during depression remains unclear. Here, we investigated the effect of PDE4 on the expression of complement component 1q (C1q) and C3. We also designed and synthesized a novel PDE4 inhibitor LS21013A-06 (A06), and examined whether A06 exerts antidepressant-like effects by regulating microglia phagocytosis and complement-mediated synaptic pruning. We found that treatment with high-mobility group box-1 (HMGB1) triggered an inflammatory response, enhanced levels of complement component 1q (C1q) and C3, and promoted microglial phagocytosis both in vitro and in vivo. Notably, PDE4B knockdown reduced the levels of HMGB1, C1q, and C3 in lipopolysaccharide (LPS)-treat
Supports
The Role of Complement Dysregulation in Glaucoma.
Abstract
Glaucoma is a progressive neurodegenerative disease characterized by damage to the optic nerve that results in irreversible vision loss. While the exact pathology of glaucoma is not well understood, emerging evidence suggests that dysregulation of the complement system, a key component of innate immunity, plays a crucial role. In glaucoma, dysregulation of the complement cascade and impaired regulation of complement factors contribute to chronic inflammation and neurodegeneration. Complement components such as C1Q, C3, and the membrane attack complex have been implicated in glaucomatous neuroinflammation and retinal ganglion cell death. This review will provide a summary of human and experimental studies that document the dysregulation of the complement system observed in glaucoma patients and animal models of glaucoma driving chronic inflammation and neurodegeneration. Understanding how complement-mediated damage contributes to glaucoma will provide opportunities for new therapies.
Supports
Alzheimer's Disease as a Disorder of Neuroimmune Dysregulation.
Abstract
Alzheimer's disease (AD) is traditionally defined by Amyloid-β (Aβ) plaques and tau neurofibrillary tangles, yet these proteinopathies alone fail to explain disease heterogeneity, progression, and cognitive decline. Emerging evidence identifies chronic neuroinflammation as a central integrator that converts molecular pathology into synaptic failure and neurodegeneration. In this context, Aβ acts as a danger-associated molecular pattern that activates microglial and astrocytic immune programs through receptors such as TREM2, TLRs, and RAGE, leading to inflammasome activation, cytokine release, and oxidative stress. These responses pathologically re-engage developmental complement pathways (C1q-C3-CR3), driving excessive synaptic pruning that correlates more closely with cognitive impairment than neuronal loss. Reactive astrocytes further amplify dysfunction by impairing glutamate and potassium homeostasis, promoting excitotoxic and metabolic stress, while inflammatory glia facilitate pr
Supports
Divergent complement system activation in two clinically distinct murine models of multiple sclerosis.
Abstract
Multiple sclerosis (MS) is a neurological disease featuring neuroinflammation and neurodegeneration in young adults. So far, most research has focused on the peripheral immune system, which appears to be the driver of acute relapses. Concurrently, the mechanisms underlying neurodegeneration in the progressive forms of the disease remain unclear. The complement system, a molecular component of the innate immunity, has been recently implicated in several neurological disorders, including MS. However, it is still unknown if the complement proteins detected in the central nervous system (CNS) are actively involved in perpetuating chronic inflammation and neurodegeneration. To address this knowledge gap, we compared two clinically distinct mouse models of MS: 1) proteolipid protein (PLP)-induced experimental autoimmune encephalomyelitis (rEAE) resembling a relapsing-remitting disease course, and 2) Theiler's murine encephalomyelitis virus-induced demyelinating disease (TMEV-IDD) resembling
Supports
Complement System in Neural Synapse Elimination in Development and Disease.
Abstract
Recent discoveries implicate the classical complement cascade in normal brain development and in disease. Complement proteins C1q, C3, and C4 participate in synapse elimination, tagging inappropriate synaptic connections between neurons for removal by phagocytic microglia that exist in a special, highly phagocytic state during the synaptic pruning period. Several neurodevelopmental disorders, such as schizophrenia and autism, are thought to be caused by an imbalance in synaptic pruning, and recent studies suggest that dysregulation of complement could promote this synaptic pruning imbalance. Moreover, in the mature brain, complement can be aberrantly activated in early stages of neurodegenerative diseases to stimulate synapse loss. Similar pathways can also be activated in response to inflammation, as in West Nile Virus infection or in lupus, where peripheral inflammation can promote microglia-mediated synapse loss. Whether synapse loss in disease is a true reactivation of developmenta
Supports
Panacis Quinquefolii Radix Polysaccharides Alleviate Depressive-Like Behaviors in Chronic Unpredictable Mild Stress-Induced Mice by Suppressing Complement C1Q/C3-Mediated Microglial Synaptic Pruning and Modulating Gut Microbiota.
Abstract
AIMS: Panax quinquefolius Radix (American ginseng) is a medicinal herb used for its neuroprotective and tonic effects. However, the antidepressant potential of its polysaccharide components is not well studied. This research aimed to investigate the antidepressant effects of XYS1, a polysaccharide from American ginseng, focusing on mechanisms related to the complement system and the gut-brain axis. METHODS: A chronic unpredictable mild stress (CUMS) mouse model was used to induce depressive behaviors. Mice were treated with XYS1 via oral gavage, followed by assessments of behavior, molecular changes, and gut microbiota. RESULTS: XYS1 treatment significantly alleviated depression-like behaviors in CUMS mice, as demonstrated by reduced immobility time in the TST and FST, and increased sucrose preference and body weight. Mechanistically, XYS1 attenuated complement system activation by downregulating C1Q expression in microglia and C3 expression in astrocytes, not only in the hippocampal C
Supports
Messengers of coagulopathy: complement-carrying extracellular vesicles in SARS-CoV-2 infection.
Abstract
PURPOSE OF REVIEW: SARS-CoV-2 disease (COVID-19) is increasingly recognized as a thromboinflammatory vascular disorder characterized by dysregulated complement activation, endothelial injury, and sustained hypercoagulability. This review examines emerging evidence that extracellular vesicles act as key intermediaries linking complement activation to coagulation in acute and postacute COVID-19 infection. RECENT FINDINGS: Recent studies demonstrate that extracellular vesicles released from platelets, endothelial cells, and neutrophils are markedly increased in COVID-19 and exhibit a combined procoagulant and complement-active phenotype. Sub-lytic complement attack, particularly membrane attack complex (MAC) deposition, triggers phosphatidylserine exposure and extracellular vesicle shedding, generating vesicles that support thrombin generation and propagate complement activity in the circulation. Extracellular vesicle-associated complement components, including C1q, C3 fragments, MASP2, a
Supports
Vaccine-induced antibodies can limit Salmonella infection in the absence of complement or macrophages.
Abstract
Antibodies against Salmonella Typhimurium (STm) can provide protection against infection. Understanding how antibodies, complement, and leukocytes interact is essential and can help advance vaccine development. To evaluate the in vivo role of STm-specific antibodies, mice were immunized with an outer membrane vesicle (OMV) vaccine and subsequently challenged with STm. Immunohistology and intravital microscopy revealed that OMV-induced antibodies promoted STm uptake by macrophages in the spleen and liver, whereas bacteria were only infrequently associated with neutrophils. Depletion of monocytic cells using clodronate liposomes demonstrated that these cells help prevent antigen dissemination. Immunization and challenge experiments in mice deficient in C1q, C3, C4, or C5 showed that OMV immunization conferred protection in all groups except C3-deficient mice. Mice deficient in C3 failed to develop robust germinal center and plasma cell responses following OMV immunization. Nevertheless,
Supports
The paper explores complement mechanisms across the blood-brain barrier, which aligns with the hypothesis's focus on complement-mediated neurological processes.
Abstract
Complement is increasingly recognized as a context-dependent contributor to cerebral amyloid angiopathy (CAA), yet its roles are often discussed without compartmental resolution and are frequently extrapolated from Alzheimer's disease (AD). This review synthesizes evidence from human pathology, multi-omics, and experimental models to delineate how complement activity diverges between the vessel wall/perivascular space (PVS) and the brain parenchyma, and how the two compartments couple when the b
Contradicts
Microglia regulation of synaptic plasticity and learning and memory.
Abstract
Microglia are the resident macrophages of the central nervous system. Microglia possess varied morphologies and functions. Under normal physiological conditions, microglia mainly exist in a resting state and constantly monitor their microenvironment and survey neuronal and synaptic activity. Through the C1q, C3 and CR3 "Eat Me" and CD47 and SIRPα "Don't Eat Me" complement pathways, as well as other pathways such as CX3CR1 signaling, resting microglia regulate synaptic pruning, a process crucial for the promotion of synapse formation and the regulation of neuronal activity and synaptic plasticity. By mediating synaptic pruning, resting microglia play an important role in the regulation of experience-dependent plasticity in the barrel cortex and visual cortex after whisker removal or monocular deprivation, and also in the regulation of learning and memory, including the modulation of memory strength, forgetfulness, and memory quality. As a response to brain injury, infection or neuroinfl
Contradicts
Complement, Inflammasome, and Microglial Crosstalk in Glaucoma: From Neurodegeneration to Immune-Based Precision Therapy.
Abstract
Glaucoma is no longer viewed solely as a pressure-mediated optic neuropathy but as a chronic neurodegenerative disease with a strong immune component. Across experimental models and patient samples, convergent inflammatory circuitry complement activation, NLRP3 inflammasome signaling, and microglial reactivity emerge as a central driver of retinal ganglion cell (RGC) dysfunction and death. Local complement upregulation (C1q, C3, C5) in the retina and optic nerve head (ONH) promotes aberrant synaptic tagging, phagoptosis, and membrane attack complex stress. In parallel, biomechanical strain, ischemia, mitochondrial damage, and danger-associated molecular patterns prime and activate the NLRP3 inflammasome in microglia, astrocytes, and ONH cells, leading to caspase-1 activation, IL-1β/IL-18 maturation, and pyroptotic or apoptotic injury. Microglia integrate these cues, shifting from early protective surveillance to chronic maladaptive states that amplify complement and inflammasome output
Contradicts
Complement C3 knockout impairs synaptic pruning during development and may compromise beneficial microglial functions in adult brain
Abstract
We report a 48-year-old woman with metastatic infiltrating lobular carcinoma of the breast. Though her metastatic disease remained stable, she was repeatedly admitted for symptomatic anaemia and treated by red blood cell and platelet transfusions with increasing frequency as time elapsed. Abdominal examination and ultrasound revealed splenomegaly (27 cm span). A bone marrow biopsy showed fibrosis and foci of metastatic carcinoma. Splenectomy ameliorated her transfusion-dependent anaemia and thrombocytopaenia. Histopathology revealed multiple foci of metastatic carcinoma and scattered foci of extramedullary haematopoiesis. Differential diagnosis of anaemia and thrombocytopaenia in patients with cancer include bone morrow involvement by cancer cells, iron-deficiency anaemia, microangiopathies and chemotherapy suppression of haematopoiesis. Splenic involvement with cancer is common in patients with multivisceral disease. Many may regard transfusion-dependent severe anaemia and thrombocyto
Contradicts
SASP heterogeneity means senescent cells produce both pro-inflammatory (C3, IL-6) and neuroprotective (VEGF, PDGF) factors — bulk removal risks collateral damage
Contradicts
Complement inhibition in aged mice impairs amyloid plaque compaction by microglia, potentially increasing diffuse toxic oligomers
Abstract
Quantum dots (QDs) have attracted much attention over the past decades due to their outstanding properties. However, obtaining QDs with excellent photoluminescence and quantum yields (QYs) from their aqueous synthesis is still a big concern. We herein present a green and facile synthesis of AgInS (AIS) QDs and AgInS-ZnS (AIS-ZnS) core-shell QDs using a combination of two capping agents (glutathione and sodium citrate). The temporal evolution of the optical properties is investigated by varying the reaction time and pH of the solution. The results show that the fluorescence intensity of the QDs increases as the reaction time increase, while the emission position blue-shift as the pH of the solution increase. An outstanding photoluminescence quantum yield (PLQY) of 90% is obtained at optimized synthetic conditions. The Fourier transform Infrared studies confirm efficient passivation of the QDs by the capping agents. The XRD analysis reveals that all the materials crystallize in the tetra
Contradicts
Senescent cell burden in human AD brain is lower than in mouse models, questioning translational relevance of senolytic approaches
Contradicts
Anti-C3 antibodies show limited CNS penetration and rapid complement pathway recovery after discontinuation
Abstract
Chondrosarcoma(CS), a prevalent primary malignant bone tumor, frequently exhibits chemotherapy resistance attributed to upregulated anti-apoptosis pathways such as the Bcl-2 family. In this manuscript, a new strategy is presented to augment chemosensitivity and mitigate systemic toxicity by harnessing a nano-enabled drug delivery hydrogel platform. The platform utilizes "PLGA-PEG-PLGA", an amphiphilic triblock copolymer combining hydrophilic polyethylene glycol (PEG) and hydrophobic polylactide glycolide (PLGA) blocks, renowned for its properties conducive to crafting a biodegradable, temperature-sensitive hydrogel. This platform is tailored to encapsulate a ratiometrically designed dual-loaded liposomes containing a first-line chemo option for CS, Doxorubicin (Dox), plus a calculated amount of small molecule inhibitor for anti-apoptotic Bcl-2 pathway, ABT-737. In vitro and in vivo evaluations demonstrate successful Bcl-2 suppression, resulting in the restoration of Dox sensitivity, ev
Contradicts
Sialylation and Galectin-3 in Microglia-Mediated Neuroinflammation and Neurodegeneration.
Abstract
Microglia are brain macrophages that mediate neuroinflammation and contribute to and protect against neurodegeneration. The terminal sugar residue of all glycoproteins and glycolipids on the surface of mammalian cells is normally sialic acid, and addition of this negatively charged residue is known as "sialylation," whereas removal by sialidases is known as "desialylation." High sialylation of the neuronal cell surface inhibits microglial phagocytosis of such neurons, via: (i) activating sialic acid receptors (Siglecs) on microglia that inhibit phagocytosis and (ii) inhibiting binding of opsonins C1q, C3, and galectin-3. Microglial sialylation inhibits inflammatory activation of microglia via: (i) activating Siglec receptors CD22 and CD33 on microglia that inhibit phagocytosis and (ii) inhibiting Toll-like receptor 4 (TLR4), complement receptor 3 (CR3), and other microglial receptors. When activated, microglia release a sialidase activity that desialylates both microglia and neurons, a
Contradicts
Systemic Neurodegeneration and Brain Aging: Multi-Omics Disintegration, Proteostatic Collapse, and Network Failure Across the CNS.
Abstract
Neurodegeneration is increasingly recognized not as a linear trajectory of protein accumulation, but as a multidimensional collapse of biological organization-spanning intracellular signaling, transcriptional identity, proteostatic integrity, organelle communication, and network-level computation. This review intends to synthesize emerging frameworks that reposition neurodegenerative diseases (ND) as progressive breakdowns of interpretive cellular logic, rather than mere terminal consequences of protein aggregation or synaptic attrition. The discussion aims to provide a detailed mapping of how critical signaling pathways-including PI3K-AKT-mTOR, MAPK, Wnt/β-catenin, and integrated stress response cascades-undergo spatial and temporal disintegration. Special attention is directed toward the roles of RNA-binding proteins (e.g., TDP-43, FUS, ELAVL2), m6A epitranscriptomic modifiers (METTL3, YTHDF1, IGF2BP1), and non-canonical post-translational modifications (SUMOylation, crotonylation) i
Contradicts
The Immuno-Glial Connectome in Alzheimer's Disease: Integrating Central and Peripheral Inflammatory Networks.
Abstract
UNLABELLED: Alzheimer’s disease (AD) is increasingly recognized as a disorder of dysregulated neuroimmune connectivity rather than isolated proteinopathy. The immuno-glial connectome, the dynamic interplay between microglia, astrocytes, and peripheral immune systems, constitutes a central driver of disease initiation and progression. Emerging single-cell and spatial transcriptomic studies reveal heterogeneous glial subpopulations with context-dependent transcriptional programs governed by TREM2–APOE, NF-κB, JAK/STAT, and NLRP3 inflammasome signaling. These networks converge to sustain chronic inflammation, impair amyloid-β clearance, and accelerate tau pathology. Complement dysregulation (C1q–C3 axis) further promotes aberrant synaptic pruning, while cytokine feedback loops involving IL-1β, TNF-α, and IFN-γ amplify neurotoxicity. Beyond the brain, peripheral immune cells, monocytes, macrophages, T and B lymphocytes, and neutrophils breach the compromised blood–brain barrier (BBB), perp
📖 Linked Papers (28)Export BibTeX ↗
Alzheimer's Disease as a Disorder of Neuroimmune Dysregulation.
Neurology international (2026) · PubMed:41745721 ↗
5 figures
Figure 1
Neuroinflammatory axes driving Alzheimer’s disease pathology. This schematic summarizes five interconnected axes of neuroinflammation that contribute to the ini...
Figure 2
Amyloid-β as a danger signal driving neuroinflammation in Alzheimer’s disease. Oligomeric and fibrillar amyloid-β (Aβ) act as damage-associated molecular patter...
The Immuno-Glial Connectome in Alzheimer's Disease: Integrating Central and Peripheral Inflammatory Networks.
Cellular and molecular neurobiology (2026) · PubMed:41569436 ↗
6 figures
Fig. 1
Dynamic microglial activation programs and signaling networks in Alzheimer’s disease (AD). Under physiological conditions, microglia exist in a state of homeost...
Fig. 2
Schematic representation of astrocytic activation and neuroinflammatory pathways in Alzheimer’s disease (AD). Exposure to amyloid-β (Aβ) or injury triggers reac...
Systemic Neurodegeneration and Brain Aging: Multi-Omics Disintegration, Proteostatic Collapse, and Network Failure Across the CNS.
Biomedicines (2025) · PubMed:40868276 ↗
2 figures
Figure 1
Illustrative classification of non-coding RNAs. Gene-silencing small RNAs (miRNA, piRNA, siRNA) and structural regulatory RNAs (snRNA, snoRNA, lncRNA) derive fr...
Figure 2
Immune signaling loop initiated by neuronal stress and degeneration. Cumulative mechanical or metabolic injury promotes the release of high-mobility group box 1...
The cholesterol 24-hydroxylase CYP46A1 promotes α-synuclein pathology in Parkinson's disease.
PLoS biology (2025) · PubMed:39964974 ↗
9 figures
Fig 1
CYP46A1 and 24-OHC are up-regulated in PD patients and PD model mice.
Fig 2
α-Syn pathology and its spread are significantly reduced after CYP46A1 removal in vivo.
Complement C1q/C3-CR3 signaling pathway mediates abnormal microglial phagocytosis of synapses in a mouse model of depression.
Brain Behav Immun (2024) · PubMed:38642614 ↗
1 figure
Figures
Figures available at source paper (no open-access XML found).
Development of Injectable Thermosensitive Nanocomposite Hydrogel for Ratiometric Drug Delivery to Treat Drug Resistant Chondrosarcoma In Vivo.
Small (Weinheim an der Bergstrasse, Germany) (2024) · PubMed:38456789 ↗
1 figure
Figures
Figures available at source paper (no open-access XML found).
Retracted: Ginsenoside Rg1 Ameliorates Acute Renal Ischemia/Reperfusion Injury via Upregulating AMPK
Oxidative medicine and cellular longevity (2024) · PubMed:38234567 ↗
1 figure
Figures
Figures available at source paper (no open-access XML found).
Metabolic orchestration of cell death by AMPK-mediated phosphorylation of RIPK1.
Science (2023) · PubMed:37384704 ↗
1 figure
Figures
Figures available at source paper (no open-access XML found).
Impact of satellite blood culture on early diagnosis of sepsis.
Journal of intensive medicine (2022) · PubMed:36789234 ↗
1 figure
Figure 1
Flowchart of blood culture processing. LBC: Laboratory blood culture; SBC: Satellite blood culture.
Controlled synthesis of silver-based ternary quantum dots with outstanding luminescence.
Journal of fluorescence (2022) · PubMed:35678901 ↗
1 figure
Figures
Figures available at source paper (no open-access XML found).
ATAD3A oligomerization promotes neuropathology and cognitive deficits in Alzheimer's disease models.
Nature communications (2022) · PubMed:35236834 ↗
7 figures
Fig. 1
Aberrant ATAD3A oligomerization in AD models.
Fig. 2
ATAD3A oligomerization impairs MAM integrity under AD conditions.
Microglia regulation of synaptic plasticity and learning and memory.
Neural Regen Res (2022) · PubMed:34472455 ↗
2 figures
Figure 1
Resting microglia regulate synaptic pruning, synaptic plasticity and cognition in the healthy brain . Microglia communicate with neurons through physical contac...
Figure 2
Activated microglia contribute to learning and memory deficits in different disorders . Active microglia can disrupt neuronal plasticity and cognitive function ...
📙 Related Wiki Pages (15)
Age-Sensitive Cortical Vulnerability in mechanismSLC30A9 — Solute Carrier Family 3 Membergenemorc3geneSIGLEC3 Gene (CD33)geneLC3B ProteinproteinLC3 (MAP1LC3) NeuronscellXRCC3geneSLC34A2 — Solute Carrier Family 3 MembergeneMAP1LC3A Genegeneslc32a1geneTRPC3 GenegeneMAP1LC3B2 GenegeneBBC3 — BCL2 Binding Component 3 (PUMA)geneSLC39A8 ProteinproteinPIK3C3 (VPS34) Proteinprotein
🏥 Translation
🧬 3D Protein Structure — C1Q
No curated PDB or AlphaFold mapping for C1Q yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for C1Q/C3 from GTEx v10.
💉 Clinical Trials (4)Relevance: 75%
0
Active
Active
0
Completed
Completed
0
Total Enrolled
Total Enrolled
Clinical trial NCT03547401Unknown
Unknown·NCT03547401
Clinical trial NCT04685590Unknown
Unknown·NCT04685590
Clinical trial NCT04569591Unknown
Unknown·NCT04569591
Clinical trial NCT04063124Unknown
Unknown·NCT04063124
No curated ClinVar variants loaded for this hypothesis.
Run scripts/backfill_clinvar_variants.py to fetch P/LP/VUS variants.
No DepMap CRISPR Chronos data found for C1Q.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
💰 Estimated Development
Cost
$0
Timeline
19 months
🏆 Tournament
🏆 Arenas / Elo
No arena matches recorded yet. Browse Arenas →
📊 Market Indicators
7d Trend
↘
Falling
7d Momentum
▼ 2.7%
Volatility
Low
0.0152
Events (7d)
6
Price History
▼31.5%💾 Resource Usage
LLM Tokens
11,152
$0.0669
Total Cost
$0.0669
🔮 Predictions
🔎 Predictions vs Observations1 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| If hypothesis is true, intervention prevent synapse loss while preserving beneficial immune surveillance | prevent synapse loss while preserving beneficial immune surveillance | — no observation — | pending | 0.70 |
🔮 Falsifiable Predictions (1)
pendingconf 70%
If hypothesis is true, intervention prevent synapse loss while preserving beneficial immune surveillance
Predicted outcome: prevent synapse loss while preserving beneficial immune surveillance
Falsification: Intervention fails to prevent synapse loss while preserving beneficial immune surveillance
📖 References (14)
- Complement and microglia mediate early synapse loss in Alzheimer mouse models.Hong S et al.. Science (2016)
- Microglia regulation of synaptic plasticity and learning and memory.Cornell J et al.. Neural Regen Res (2022)
- ATAD3A oligomerization promotes neuropathology and cognitive deficits in Alzheimer's disease models.Zhao Y et al.. Nature communications (2022)
- Metabolic orchestration of cell death by AMPK-mediated phosphorylation of RIPK1.Zhang T et al.. Science (2023)
- Complement C1q/C3-CR3 signaling pathway mediates abnormal microglial phagocytosis of synapses in a mouse model of depression.Han QQ et al.. Brain Behav Immun (2024)
- The cholesterol 24-hydroxylase CYP46A1 promotes α-synuclein pathology in Parkinson's disease.Dai L et al.. PLoS biology (2025)
- Underutilization of Bowel Ultrasound in North America in Children with Inflammatory Bowel Disease.["Gamboa H" et al.. Digestive diseases (Basel, Switzerland) (2020)
- Host-Guest Complexation Between Cyclodextrins and Hybrid Hexavanadates: What are the Driving Forces?["Fa Bamba I" et al.. Chemistry (Weinheim an der Bergstrasse, Germany) (2021)
- Impact of satellite blood culture on early diagnosis of sepsis.["Guo Z" et al.. Journal of intensive medicine (2022)
- Retracted: Ginsenoside Rg1 Ameliorates Acute Renal Ischemia/Reperfusion Injury via Upregulating AMPK["Longevity O"]. Oxidative medicine and cellular longevity (2024)
- Complement, Inflammasome, and Microglial Crosstalk in Glaucoma: From Neurodegeneration to Immune-Based Precision Therapy.Chen TY et al.. Life (Basel) (2026)
- Splenectomy for breast carcinoma diffusely metastatic to the spleen presenting as severe transfusion-dependent anaemia and thrombocytopaenia.["Hasadia R" et al.. BMJ case reports (2018)
- Anaesthesia and analgesia for knee joint arthroplasty.R O'Donnell; J Dolan. BJA education (2018)
- Controlled synthesis of silver-based ternary quantum dots with outstanding luminescence.["Mbaz G" et al.. Journal of fluorescence (2022)
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |
📊 Evidence Profile
Evidence Balance
+0%
Certainty
0%
Debates
2
Incoming
0
Outgoing
0
0 supporting
0 contradicting
2 neutral
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