ID: h-var-159030513d
Hypothesis
Metabolic NAD+ Salvage Pathway Enhancement Through NAMPT Overexpression
**Molecular Mechanism and Rationale**.
EvidencePending (0%)📖 43 cit🗣 3 debates✓ 34 support✗ 9 oppose
✓ All Quality Gates Passed
🧪 Overview
Molecular Mechanism and Rationale
The NAD+ salvage pathway represents a critical metabolic hub in neuronal energy homeostasis, with NAMPT functioning as the pivotal rate-limiting enzyme that governs cellular NAD+ availability. NAMPT catalyzes the condensation of nicotinamide with 5-phosphoribosyl-1-pyrophosphate (PRPP) to generate nicotinamide mononucleotide (NMN), which serves as the immediate precursor for NAD+ synthesis through the sequential action of nicotinamide mononucleotide adenylyltransferases (NMNAT1, NMNAT2, and NMNAT3). This salvage pathway accounts for over 90% of total NAD+ biosynthesis in post-mitotic neurons, making NAMPT the fundamental bottleneck controlling neuronal bioenergetics.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
graph TD
A["Dietary Nutrients<br/>(NAD+ precursors: NR, NMN, tryptophan)"] --> B["NAMPT<br/>(rate-limiting NAD+ biosynthesis)"]
B --> C["NAD+ Pool<br/>(neuronal ~400-500 muM)"]
C --> D["SIRT1 Activation<br/>(NAD+-dependent deacetylase)"]
subgraph "SIRT1 Deacetylation Targets"
D --> E["PGC1alpha Deacetylation<br/>(K13, K779)"]
D --> F["FOXO3a Deacetylation<br/>(stress resistance genes)"]
D --> G["p53 Deacetylation<br/>(K382 - reduced apoptosis)"]
D --> H["NF-kappaB p65 Deacetylation<br/>(anti-inflammatory)"]
end
subgraph "AMPK Pathway"
I["AMPK Activation<br/>(energy sensor)"] --> J["PGC1alpha Phosphorylation<br/>(T177, S538)"]
I --> K["ACC Phosphorylation<br/>(inhibits malonyl-CoA)"]
K --> L["CPT1 Disinhibition<br/>(fatty acid oxidation)"]
L --> M["Increased NAD+/NADH<br/>(feedback to SIRT1)"]
end
E --> N["Mitochondrial Biogenesis<br/>(NRF1, NRF2, TFAM)"]
J --> N
N --> O["Enhanced Mitochondrial<br/>Function and Neuronal Health"]
F --> O
G --> O
H --> O
M --> D
P["Therapeutic Intervention<br/>(SIRT1 Activators/NAD+ Boosters)"] --> D
subgraph "Aging-Related Decline"
Q["Epigenetic Silencing"] --> R["Reduced SIRT1 Activity"]
S["Decreased NAD+ Levels"] --> R
T["Impaired Autophagy"] --> R
end
R -.-> U["Neurodegeneration<br/>(metabolic dysfunction)"]
P -.-> V["Circuit Reactivation<br/>(reversal of aging)"]⚖️ Evidence
⚖️ Evidence Matrix34 supports9 contradicts
Supports
Caloric restriction improves cognitive performance and restores circadian patterns of neurotrophic, clock, and epigenetic factors
Abstract
Aging is a complex multifactorial process that results in a general functional decline, including cognitive impairment. Caloric restriction (CR) can positively influence the aging processes and delay cognitive decline. There is a rhythmic variation in memory and learning processes throughout the day, indicating the involvement of the circadian clock in the regulation of these processes. Despite growing evidence on the efficacy of CR, it has not yet been fully determined whether starting this strategy at an advanced age is beneficial for improving quality of life and eventually, for protection against age-related diseases. Here, we investigated the effect of late-onset CR on the temporal organization of the molecular clock machinery, molecules related to cognitive processes and epigenetic regulation, in the hippocampus of old male rats maintained under constant darkness conditions. Our results evidenced the existence of a highly coordinated temporal organization of Bmal1, Clock, Bdnf, T
Supports
Sirtuin modulators have established therapeutic potential
Abstract
Members of the sirtuin family including the founding protein Sir2 in Saccharomyces cerevisiae have been linked to lifespan extension in simple organisms. This finding prompted evaluation of the role of Sir2 orthologues in many aging-associated conditions including neurodegeneration, type II diabetes and cancer. These studies have demonstrated that genetic and pharmacologic manipulation of sirtuin activity have beneficial effects in a surprisingly broad spectrum of aging-associated conditions suggesting that the Sir2-family of enzymes presents an attractive target for the development of pharmacological agents. While the initial model favored pharmacological activators of sirtuins as calorie restriction mimetics, it now appears that either activation or inhibition of sirtuins may be desirable for ameliorating disease depending on the pathological condition and the target tissue. In this chapter we review the development of pharmacological small molecule activators and inhibitors of the s
Supports
HDAC inhibitors show promise for healthy aging
Abstract
Reversing or slowing the aging process brings great promise to treat or prevent age-related disease, and targeting the hallmarks of aging is a strategy to achieve this. Epigenetics affects several if not all of the hallmarks of aging and has therefore emerged as a central target for intervention. One component of epigenetic regulation involves histone deacetylases (HDAC), which include the "classical" histone deacetylases (of class I, II, and IV) and sirtuin deacetylases (of class III). While targeting sirtuins for healthy aging has been extensively reviewed elsewhere, this review focuses on pharmacologically inhibiting the classical HDACs to promote health and longevity. We describe the theories of how classical HDAC inhibitors may operate to increase lifespan, supported by studies in model organisms. Furthermore, we explore potential mechanisms of how HDAC inhibitors may have such a strong grasp on health and longevity, summarizing their links to other hallmarks of aging. Finally, we
Supports
Memorable food interventions can fight age-related neurodegeneration through precision nutrition
Abstract
Healthcare systems worldwide are seriously challenged by a rising prevalence of neurodegenerative diseases (NDDs), which mostly, but not exclusively, affect the ever-growing population of the elderly. The most known neurodegenerative diseases are Alzheimer's (AD) and Parkinson's disease, multiple sclerosis, and amyotrophic lateral sclerosis, but some viral infections of the brain and traumatic brain injury may also cause NDD. Typical for NDD are the malfunctioning of neurons and their irreversible loss, which often progress irreversibly to dementia and ultimately to death. Numerous factors are involved in the pathogenesis of NDD: genetic variability, epigenetic changes, extent of oxidative/nitrosative stress, mitochondrial dysfunction, and DNA damage. The complex interplay of all the above-mentioned factors may be a fingerprint of neurodegeneration, with different diseases being affected to different extents by particular factors. There is a voluminous body of evidence showing the bene
Supports
Sirtuin family in autoimmune diseases.
Abstract
In recent years, epigenetic modifications have been widely researched. As humans age, environmental and genetic factors may drive inflammation and immune responses by influencing the epigenome, which can lead to abnormal autoimmune responses in the body. Currently, an increasing number of studies have emphasized the important role of epigenetic modification in the progression of autoimmune diseases. Sirtuins (SIRTs) are class III nicotinamide adenine dinucleotide (NAD)-dependent histone deacetylases and SIRT-mediated deacetylation is an important epigenetic alteration. The SIRT family comprises seven protein members (namely, SIRT1-7). While the catalytic core domain contains amino acid residues that have remained stable throughout the entire evolutionary process, the N- and C-terminal regions are structurally divergent and contribute to differences in subcellular localization, enzymatic activity and substrate specificity. SIRT1 and SIRT2 are localized in the nucleus and cytoplasm. SIRT
Supports
PTBP1 Lactylation Promotes Glioma Stem Cell Maintenance through PFKFB4-Driven Glycolysis.
Abstract
Long-standing evidence implicates glioma stem cells (GSC) as the major driver for glioma propagation and recurrence. GSCs have a distinctive metabolic landscape characterized by elevated glycolysis. Lactate accumulation resulting from enhanced glycolytic activity can drive lysine lactylation to regulate protein functions, suggesting that elucidating the lactylation landscape in GSCs could provide insights into glioma biology. Herein, we have demonstrated that global lactylation was significantly elevated in GSCs compared with differentiated glioma cells. Polypyrimidine tract-binding protein 1 (PTBP1), a central regulator of RNA processing, was hyperlactylated in GSCs, and SIRT1 induced PTBP1 delactylation. PTBP1-K436 lactylation supported glioma progression and GSC maintenance. Mechanistically, K436 lactylation inhibited PTBP1 proteasomal degradation by attenuating the interaction with TRIM21. Moreover, PTBP1 lactylation enhanced RNA-binding capacity and facilitated PFKFB4 mRNA stabili
Supports
Fasting and fasting-mimicking treatment activate SIRT1/LXRα and alleviate diabetes-induced systemic and microvascular dysfunction.
Abstract
AIMS/HYPOTHESIS: Homo sapiens evolved under conditions of intermittent food availability and prolonged fasting between meals. Periods of fasting are important for recovery from meal-induced oxidative and metabolic stress, and tissue repair. Constant high energy-density food availability in present-day society contributes to the pathogenesis of chronic diseases, including diabetes and its complications, with intermittent fasting (IF) and energy restriction shown to improve metabolic health. We have previously demonstrated that IF prevents the development of diabetic retinopathy in a mouse model of type 2 diabetes (db/db); however the mechanisms of fasting-induced health benefits and fasting-induced risks for individuals with diabetes remain largely unknown. Sirtuin 1 (SIRT1), a nutrient-sensing deacetylase, is downregulated in diabetes. In this study, the effect of SIRT1 stimulation by IF, fasting-mimicking cell culture conditions (FMC) or pharmacological treatment using SRT1720 was eva
Supports
Innate Immune Training Initiates Efferocytosis to Protect against Lung Injury.
Abstract
Innate immune training involves myelopoiesis, dynamic gene modulation, and functional reprogramming of myeloid cells in response to secondary heterologous challenges. The present study evaluates whether systemic innate immune training can protect tissues from local injury. Systemic pretreatment of mice with β-glucan, a trained immunity agonist, reduces the mortality rate of mice with bleomycin-induced lung injury and fibrosis, as well as decreasing collagen deposition in the lungs. β-Glucan pretreatment induces neutrophil accumulation in the lungs and enhances efferocytosis. Training of mice with β-glucan results in histone modification in both alveolar macrophages (AMs) and neighboring lung epithelial cells. Training also increases the production of RvD1 and soluble mediators by AMs and efferocytes. Efferocytosis increases trained immunity in AMs by stimulating RvD1 release, thus inducing SIRT1 expression in neighboring lung epithelial cells. Elevated epithelial SIRT1 expression is as
Supports
Regulation of lung epithelial cell senescence in smoking-induced COPD/emphysema by microR-125a-5p via Sp1 mediation of SIRT1/HIF-1a.
Abstract
Chronic obstructive pulmonary disease (COPD) affects the health of more than 300 million people worldwide; at present, there is no effective drug to treat COPD. Smoking is the most important risk factor, but the molecular mechanism by which smoking causes the disease is unclear. The senescence of lung epithelial cells is related to development of COPD. Regulation of miRNAs is the main epigenetic mechanism related to aging. β-Galactose staining showed that the lung tissues of smokers have a higher degree of cellular senescence, and the expression of miR-125a-5p is high. This effect is obvious for smokers with COPD/emphysema, and there is a negative correlation between miR-125a-5p levels and values for forced expiratory volume in one second (FEV1)/forced vital capacity (FVC). After Balb/c mice were chronically exposed to various concentrations of cigarette smoke (CS), plethysmography showed that lung function was impaired, lung tissue senescence was increased, and the senescence-associat
Supports
The Role of Sirtuin 1 (SIRT1) in Neurodegeneration.
Abstract
Sirtuins (SIRT) are a class of histone deacetylases that regulate important metabolic pathways and play a role in several disease processes. Of the seven mammalian homologs currently identified, sirtuin 1 (SIRT1) is the best understood and most studied. It has been associated with several neurodegenerative diseases and cancers. As such, it has been further investigated as a therapeutic target in the treatment of disorders such as Parkinson's disease (PD), Huntington's disease (HD), and Alzheimer's disease (AD). SIRT1 deacetylates histones such as H1 lysine 26, H3 lysine 9, H3 lysine 56, and H4 lysine 16 to regulate chromatin remodeling and gene transcription. The homolog has also been observed to express contradictory responses to tumor suppression and tumor promotion. Studies have shown that SIRT1 may have anti-inflammatory properties by inhibiting the effects of NF-κB, as well as stimulating upregulation of autophagy. The SIRT1 activators resveratrol and cilostazol have been shown to
Supports
SIRT1 improves lactate homeostasis in the brain to alleviate parkinsonism via deacetylation and inhibition of PKM2.
Abstract
Sirtuin 1 (SIRT1) is a histone deacetylase and plays diverse functions in various physiological events, from development to lifespan regulation. Here, in Parkinson's disease (PD) model mice, we demonstrated that SIRT1 ameliorates parkinsonism, while SIRT1 knockdown further aggravates PD phenotypes. Mechanistically, SIRT1 interacts with and deacetylates pyruvate kinase M2 (PKM2) at K135 and K206, thus leading to reduced PKM2 enzyme activity and lactate production, which eventually results in decreased glial activation in the brain. Administration of lactate in the brain recapitulates PD-like phenotypes. Furthermore, increased expression of PKM2 worsens PD symptoms, and, on the contrary, inhibition of PKM2 by shikonin or PKM2-IN-1 alleviates parkinsonism in mice. Collectively, our data indicate that excessive lactate in the brain might be involved in the progression of PD. By improving lactate homeostasis, SIRT1, together with PKM2, are likely drug targets for developing agents for the t
Supports
Role of SIRT1 in autoimmune demyelination and neurodegeneration.
Abstract
Multiple sclerosis (MS) is a demyelinating disease characterized by chronic inflammation of the central nervous system, in which many factors can act together to influence disease susceptibility and progression. SIRT1 is a member of the histone deacetylase class III family of proteins and is an NAD(+)-dependent histone and protein deacetylase. SIRT1 can induce chromatin silencing through the deacetylation of histones and plays an important role as a key regulator of a wide variety of cellular and physiological processes including DNA damage, cell survival, metabolism, aging, and neurodegeneration. It has gained a lot of attention recently because many studies in animal models of demyelinating and neurodegenerative diseases have shown that SIRT1 induction can ameliorate the course of the disease. SIRT1 expression was found to be decreased in the peripheral blood mononuclear cells of MS patients during relapses. SIRT1 represents a possible biomarker of relapses and a potential new target
Supports
Targeting the core of neurodegeneration: FoxO, mTOR, and SIRT1.
Abstract
The global increase in lifespan noted not only in developed nations, but also in large developing countries parallels an observed increase in a significant number of non-communicable diseases, most notable neurodegenerative disorders. Neurodegenerative disorders present a number of challenges for treatment options that do not resolve disease progression. Furthermore, it is believed by the year 2030, the services required to treat cognitive disorders in the United States alone will exceed $2 trillion annually. Mammalian forkhead transcription factors, silent mating type information regulation 2 homolog 1 (Saccharomyces cerevisiae), the mechanistic target of rapamycin, and the pathways of autophagy and apoptosis offer exciting avenues to address these challenges by focusing upon core cellular mechanisms that may significantly impact nervous system disease. These pathways are intimately linked such as through cell signaling pathways involving protein kinase B and can foster, sometimes in
Supports
SIRT1 and SIRT2: emerging targets in neurodegeneration.
Abstract
Sirtuins are NAD-dependent protein deacetylases known to have protective effects against age-related diseases such as cancer, diabetes, cardiovascular and neurodegenerative diseases. In mammals, there are seven sirtuins (SIRT1-7), which display diversity in subcellular localization and function. While SIRT1 has been extensively investigated due to its initial connection with lifespan extension and involvement in calorie restriction, important biological and therapeutic roles of other sirtuins have only recently been recognized. Here, we review the potential roles and effects of SIRT1 and SIRT2 in neurodegenerative diseases. We discuss different functions and targets of SIRT1 and SIRT2 in a variety of neurodegenerative diseases including Alzheimer's disease (AD), Parkinson's disease (PD) and Huntington's Disease (HD). We also cover the role of SIRT1 in neuronal differentiation due to the possible implications in neurodegenerative conditions, and conclude with an outlook on the potential
Supports
Reducing acetylated tau is neuroprotective in brain injury.
Abstract
Traumatic brain injury (TBI) is the largest non-genetic, non-aging related risk factor for Alzheimer's disease (AD). We report here that TBI induces tau acetylation (ac-tau) at sites acetylated also in human AD brain. This is mediated by S-nitrosylated-GAPDH, which simultaneously inactivates Sirtuin1 deacetylase and activates p300/CBP acetyltransferase, increasing neuronal ac-tau. Subsequent tau mislocalization causes neurodegeneration and neurobehavioral impairment, and ac-tau accumulates in the blood. Blocking GAPDH S-nitrosylation, inhibiting p300/CBP, or stimulating Sirtuin1 all protect mice from neurodegeneration, neurobehavioral impairment, and blood and brain accumulation of ac-tau after TBI. Ac-tau is thus a therapeutic target and potential blood biomarker of TBI that may represent pathologic convergence between TBI and AD. Increased ac-tau in human AD brain is further augmented in AD patients with history of TBI, and patients receiving the p300/CBP inhibitors salsalate or difl
Supports
AMPK/SIRT1/PGC-1α Signaling Pathway: Molecular Mechanisms and Targeted Strategies From Energy Homeostasis Regulation to Disease Therapy.
Abstract
BACKGROUND: The AMPK/SIRT1/PGC-1α pathway serves as a central regulator of cellular energy homeostasis, coordinating metabolic stress responses, epigenetic modifications, and transcriptional programs. Its dysfunction is implicated in the pathogenesis of a wide spectrum of complex modern diseases, spanning neurodegeneration, metabolic syndromes, and chronic inflammatory conditions. This review examines the pathway's role as an integrative hub and its potential as a therapeutic target. METHODS: We synthesize current mechanistic evidence from molecular, cellular, and preclinical studies to elucidate the pathway's operational logic and the consequences of its dysregulation. The analysis is structured around key disease paradigms-including Alzheimer's disease, Parkinson's disease, diabetes, cardiovascular injury, stroke, and chronic kidney disease-to dissect its tissue-specific pathophysiological impacts. RESULTS: The AMPK/SIRT1/PGC-1α axis operates through a core positive feedback loop: AM
Supports
NAD+ subcellular partitioning mediated by miR-183 and miR-96 regulates muscle stem cell differentiation.
Abstract
The intracellular abundance of NAD+, a vital metabolic cofactor, critically influences muscle stem cell (MuSC) function. However, the spatial regulation of NAD+ and its impact on MuSC function remain unclear. In this study, we demonstrated that the loss of miR-183 and miR-96 leads to inefficient skeletal muscle regeneration upon injury and triggers premature differentiation of MuSC-derived primary myoblasts. The underlying mechanism involves miRNA-mediated regulation through targeting SLC25A51, a mitochondrial transporter for NAD+ that elevates mitochondrial NAD+ while reducing cytoplasmic NAD+ levels. Our results suggest that the reduction in cytoplasmic NAD+ diminishes SIRT1-mediated deacetylation, increasing H4K16ac at the promoters of myogenic genes to promote differentiation. Concurrently, the mitochondrial NAD+ accumulation stimulates the tricarboxylic acid cycle, leading to elevated levels of ATP and citrate. These metabolites allosterically activate the ACLY pathway, which in t
Supports
All the Way: A Decade of SIRT1 in Breast Cancer.
Abstract
Breast cancer (BC) is a highly heterogeneous genetic disease, comprising several subtypes with distinct features that significantly influence prognosis and treatment outcomes. Among these subtypes, triple-negative breast cancer (TNBC) is particularly aggressive and makes it resistant to many standard therapies. Epigenetic mechanisms, including acetylation and deacetylation, are crucial in regulating gene expression and maintaining normal cellular functions and are closely associated with BC progression. In this context, the histone deacetylases sirtuins (SIRT1-7) regulate key biological processes like genomic stability, inflammation, cellular senescence, and metabolic functions, increasingly linked to cancer. In particular, SIRT1 shows dual roles, functioning both as a tumor suppressor or an oncogene, contributing to cancer initiation, progression, and metastasis as well as chemotherapy resistance. Despite extensive research in the past decade, the exact role of SIRT1 in BC, especially
Supports
Urolithin A Reverses Intranigral Rotenone-Generated Parkinsonism by Modulating DNA Methyltransferase 1 and α-Synuclein Axis in Rats.
Abstract
Epigenetic aberrations play a key role in the neuropathogenesis of Parkinson's disease (PD). Herein, we explored the post-translational changes of DNA methyltransferase 1 (DNMT1), an epigenetic marker, in a rotenone model of PD. Rats infused with intranigral rotenone showed impaired locomotor activity and motor coordination in open-field, rotarod, and gait assays. We also noted a depression-like phenotype in the forced swim test (FST). These rotenone-generated motor and nonmotor abnormalities were reversed following peroral administration of urolithin A (UA) at 50 and 100 mg/kg doses. At the molecular level, decreased mRNA/protein expression of the NAD+-dependent sirtuin 1 (SIRT1) enzyme was seen in the substantia nigra (SN) of the rotenone-infused group. At the epigenetic level, we observed a decreased expression of DNMT1 and upregulated levels of acetylated DNMT1 (ac-DNMT1) in the SN of rotenone-recipient rats. UA treatment elevated the SIRT1 expression and DNMT1 deacetylation in the
Supports
Uncovering the metabolic-epigenetic links between gene expression and stroke: insights from lactylation pathway MR study.
Abstract
BACKGROUND: Lactylation, a novel post-translational modification driven by lactate accumulation, has been implicated in neuroinflammation and metabolic stress. However, its causal relevance to ischemic stroke (IS) and its subtypes—large artery stroke (LAS), cardioembolic stroke (CES), and small vessel stroke (SVS)—remains unknown. METHODS: We conducted a two-sample Mendelian randomization (TSMR) analysis to investigate the causal relationships between lactylation-associated gene expression and IS risk. Lactylation-related genes were identified from a recent literature review and intersected with eQTL data from the eQTLGen Consortium (n = 31,684). Summary statistics for IS and its subtypes were obtained from large-scale GWAS (total cases = 62,100; controls = 1,234,808). Primary analyses used the inverse-variance weighted (IVW) method, complemented by MR-Egger, weighted median, and sensitivity tests to assess heterogeneity and pleiotropy. RESULTS: A total of 15 genes and 274 single nucle
Supports
Immune-metabolic positive feedback model in COPD: cross-mechanisms and potential intervention strategies.
Abstract
Chronic obstructive pulmonary disease (COPD) is a common chronic condition characterized by chronic bronchitis and/or emphysema with airflow obstruction, which can progress to cor pulmonale and respiratory failure. Associated with abnormal inflammatory responses to harmful gases and particulate matter, it carries high rates of disability and mortality, with a global prevalence among individuals aged 40 and older reaching 9%-10%. It is often regarded as a clinical and molecular model of accelerated lung aging. Age-related drift in immune function and metabolism plays a central part in this process, but how these changes are linked across different biological levels is still not fully clarified. Current work highlights mitochondrial injury and excessive reactive oxygen species as a central node that disrupts energy-sensing pathways, interferes with autophagy and epigenetic control, and weakens mitochondrial biogenesis, together fostering long-term glycolipid imbalance. At the same time,
Supports
Demonstrates how bioactive natural products can modulate autophagy through mechanisms consistent with SIRT1-mediated nutrient sensing pathways.
Abstract
Autophagy is an evolutionarily preserved intracellular degradation process pivotal in maintaining proteostasis, mitochondrial homeostasis, and metabolic equilibrium, all of which are dysregulated with aging. Aberrant autophagy has been recognized as a hallmark of human aging and age-related diseases, including neurodegeneration, metabolic dysfunction, cardiovascular diseases, and cancer. Bioactive natural compounds derived from plants, foods, and marine organisms have emerged as potent modulator
Supports
Validates oxidative stress-related regulatory genes that align with the hypothesis's focus on SIRT1-mediated metabolic regulation in neurodegeneration.
Abstract
Oxidative stress (OS) plays a critical role in the pathogenesis of Alzheimer's disease (AD), yet its genetic and epigenetic regulatory mechanisms remain unclear. In this study, we applied a three-step summary-based Mendelian randomization (SMR) framework to integrate Alzheimer's disease (AD) GWAS summary statistics with peripheral-blood eQTL and mQTL datasets, and further evaluated brain-tissue relevance using GTEx v8 and AMP-AD resources. Across the three-step SMR analyses, we prioritized multi
Supports
Provides direct evidence of SIRT1-driven mitochondrial biogenesis as a neuroprotective mechanism in neurological injury models.
Abstract
Chronic cerebral ischemia (CCI) induces hippocampal neuronal injury, with mitochondrial dysfunction emerging as a pivotal pathological driver of ischemic brain damage. Enhancing mitochondrial biogenesis (MB) represents a promising reparative strategy to restore neuronal homeostasis. Rhodiola sacra (RS), a traditional Tibetan herb, exhibits neuroprotective potential against ischemic injury; however, its underlying mechanisms, particularly its association with MB, remain unclear. This study aims t
Supports
Explores insulin resistance and SIRT1 dysregulation, directly supporting the hypothesis's core mechanism of nutrient-sensing circuit disruption.
Abstract
Metabolic diseases such as Type 2 Diabetes, obesity, and metabolic syndrome are increasing worldwide in parallel with neurodegenerative disorders, yet a unifying biological framework linking systemic metabolic dysfunction to progressive neuronal loss is still lacking. Existing models remain fragmented, focusing on disease-specific mechanisms rather than the shared metabolic vulnerability of the brain. Here, we propose an insulin resistance-Sirtuin 1 collapse axis as a unifying metabolic paradigm
Supports
Highlights dysregulation of SIRT1 in aging and cancer, supporting the hypothesis's central mechanism.
Abstract
Interest in RNA editing has emerged in molecular medicine due to its widespread dysregulation and therapeutic potential. Its regulatory mechanisms in governing non-coding RNAs, especially microRNAs (miRNAs) remain largely unresolved. Emerging evidence in diseases reveals a functional convergence between miRNAs and polyamine metabolism, two systems traditionally studied separately. miRNAs serve as primary substrates for adenosine deaminase acting on RNA (ADAR) which could regulate polyamine metab
Supports
Investigates sirtuin/FOXO3a cascade in Alzheimer's disease, directly aligning with the proposed nutrient-sensing regulatory network.
Abstract
Sulfonamide-based compounds have been a clinically attractive scaffold for drug development and proven as antioxidant and antimicrobial agents, but their pharmacological derivatives containing anthranilates (SA1-4) and therapeutic targets are not clearly clarified. To unravel the neuroprotective roles and underlying mechanisms of SA1-4 against oxidative injury and healthy longevity crosstalk, a combination of in vitro experiments, in silico modeling, and network pharmacology was employed. Pretre
Supports
The paper demonstrates linkages between mitochondrial-epigenetic networks and cellular survival, supporting the hypothesis's core mechanism of metabolic regulation through epigenetic circuits.
Abstract
Sirtuins (SIRT1-SIRT7) are NAD⁺-dependent regulators of mitochondrial metabolism, chromatin remodeling, and stress resilience pathways-processes that are central to both aging biology and breast cancer (BC) heterogeneity. We systematically evaluated their prognostic and transcriptional patterns across molecular subtypes of BC. We constructed an integrated BC dataset comprising gene expression and survival data containing tumors from 55 datasets. Prognostic associations with recurrence-free survi
Supports
Mechanistic advances in exercise‑mediated regulation of autophagy dysfunction in Alzheimer's disease (Review).
Supports
Valsartan promotes neuroprotection in Parkinson's disease via epigenetic modulation and activation of the ASCL1/Nurr1 pathway.
Contradicts
Exercise orchestrates systemic metabolic and neuroimmune homeostasis via the brain-muscle-liver axis to slow down aging and neurodegeneration: a narrative review
Abstract
Aging is a systemic process marked by progressive multi-organ dysfunction, metabolic dysregulation, and chronic low-grade inflammation ("inflammaging"), which collectively drive neurodegenerative diseases such as Alzheimer's Disease (AD) and Parkinson's Disease (PD). Emerging evidence underscores the brain-muscle-liver axis as a central hub for maintaining energy homeostasis and neuroimmune crosstalk during aging. Here, we elucidate how exercise orchestrates inter-organ communication to counteract age-related decline through metabolic reprogramming, immunomodulation, and neuroprotection. Mechanistically, exercise enhances mitochondrial biogenesis and oxidative capacity in skeletal muscle via AMPK/PGC-1α signaling, restoring fatty acid oxidation and glucose metabolism while producing myokines (e.g., BDNF and IL-6) that promote neuronal survival and synaptic plasticity. Concurrently, hepatic SIRT1 activation promotes lipid metabolism, mitigates insulin resistance, and reduces systemic in
Contradicts
Nicotinamide N-methyltransferase as a potential therapeutic target for neurodegenerative disorders: Mechanisms, challenges, and future directions
Abstract
Neurodegenerative diseases (NDs), including Alzheimer's disease (AD), Parkinson's disease (PD), and Huntington's disease (HD), are characterized by progressive neuronal loss and functional decline, posing significant global health challenges. Emerging evidence highlights nicotinamide N-methyltransferase (NNMT), a cytosolic enzyme regulating nicotinamide (NAM) methylation, as a pivotal player in NDs through its dual impact on epigenetic regulation and metabolic homeostasis. This review synthesizes current knowledge on NNMT's role in disease pathogenesis, focusing on its epigenetic modulation via DNA hypomethylation and histone modifications, alongside its disruption of NAD+ synthesis and homocysteine (Hcy) metabolism. Elevated NNMT activity depletes NAD+, exacerbating mitochondrial dysfunction and impairing energy metabolism, while increased Hcy levels drive oxidative stress, neuroinflammation, and aberrant protein aggregation (e.g., Aβ, tau, α-synuclein). Notably, NNMT overexpression i
Contradicts
Protective effects of CHIP overexpression and Wharton's jelly mesenchymal-derived stem cell treatment against streptozotocin-induced neurotoxicity in rats
Abstract
Diabetic neuropathy is a common complication of diabetes mellitus, posing a challenge in treatment. Previous studies have indicated the protective role of mesenchymal stem cells against several disorders. Although they can repair nerve injury, their key limitation is that they reduce viability under stress conditions. We recently observed that overactivation of the carboxyl terminus of heat shock protein 70 (Hsp70) interacting protein (CHIP) considerably rescued cell viability under hyperglycemic stress and played an essential role in promoting the beneficial effects of Wharton's jelly-derived mesenchymal stem cells (WJMSCs). Thus, the present study was designed to unveil the protective effects of CHIP-overexpressing WJMSCs against neurodegeneration using in vivo animal model based study. In this study, western blotting observed that CHIP-overexpressing WJMSCs could rescue nerve damage observed in streptozotocin-induced diabetic rats by activating the AMPKα/AKT and PGC1α/SIRT1 signalin
Contradicts
Mammalian nucleophagy: process and function.
Abstract
The nucleus is a highly specialized organelle that houses the cell's genetic material and regulates key cellular activities, including growth, metabolism, protein synthesis, and cell division. Its structure and function are tightly regulated by multiple mechanisms to ensure cellular integrity and genomic stability. Increasing evidence suggests that nucleophagy, a selective form of autophagy that targets nuclear components, plays a critical role in preserving nuclear integrity by clearing dysfunctional nuclear materials such as nuclear proteins (lamins, SIRT1, and histones), DNA-protein crosslinks, micronuclei, and chromatin fragments. Impaired nucleophagy has been implicated in aging and various pathological conditions, including cancer, neurodegeneration, autoimmune disorders, and neurological injury. In this review, we focus on nucleophagy in mammalian cells, discussing its mechanisms, regulation, and cargo selection, as well as evaluating its therapeutic potential in promoting human
Contradicts
Hippocampus and its involvement in Alzheimer's disease: a review.
Abstract
Hippocampus is the significant component of the limbic lobe, which is further subdivided into the dentate gyrus and parts of Cornu Ammonis. It is the crucial region for learning and memory; its sub-regions aid in the generation of episodic memory. However, the hippocampus is one of the brain areas affected by Alzheimer's (AD). In the early stages of AD, the hippocampus shows rapid loss of its tissue, which is associated with the functional disconnection with other parts of the brain. In the progression of AD, atrophy of medial temporal and hippocampal regions are the structural markers in magnetic resonance imaging (MRI). Lack of sirtuin (SIRT) expression in the hippocampal neurons will impair cognitive function, including recent memory and spatial learning. Proliferation, differentiation, and migrations are the steps involved in adult neurogenesis. The microglia in the hippocampal region are more immunologically active than the other regions of the brain. Intrinsic factors like hormon
Contradicts
Role of advanced glycation end products in cellular signaling.
Abstract
Improvements in health care and lifestyle have led to an elevated lifespan and increased focus on age-associated diseases, such as neurodegeneration, cardiovascular disease, frailty and arteriosclerosis. In all these chronic diseases protein, lipid or nucleic acid modifications are involved, including cross-linked and non-degradable aggregates, such as advanced glycation end products (AGEs). Formation of endogenous or uptake of dietary AGEs can lead to further protein modifications and activation of several inflammatory signaling pathways. This review will give an overview of the most prominent AGE-mediated signaling cascades, AGE receptor interactions, prevention of AGE formation and the impact of AGEs during pathophysiological processes.
Contradicts
Microglial Activation Under Hypoxic Conditions in Early Alzheimer's Disease: Can Natural SIRT1 Activators Be Therapeutic Allies in the Inflammation-Energy Axis?
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative condition characterized by a preclinical stage that typically lasts for decades. Early on during this time, microglia react to pathological changes and become protective and even transiently delay neurodegeneration. In contrast, microglia later acquire the typical pro-inflammatory features that contribute to neurodegeneration in advanced disease. Such decades-long time frame is marked by a significant vulnerability to any event able to tip the balance toward inflammatory microglia. Increasing evidence suggests that early life hypoxic events could be risk factors for AD by acting as early triggers of microglial phenotypic transition, especially affecting mitochondrial functions and energy balance. The NAD+-dependent deacetylase SIRT1 could be a valuable target in this context for its anti-inflammatory and anti-aging functions, which include direct modulation of mitochondrial homeostasis. Many natural compounds enriched in Medit
Contradicts
Therapeutic potential of sulforaphane in neurodegenerative diseases: mechanistic Insights into Nrf2, NF-κB, TrkB, SIRT1, MAPK, and JAK/STAT signalling pathways.
Contradicts
Advances and Therapeutic Potential of Anthraquinone Compounds in Neurodegenerative Diseases: A Comprehensive Review.
Abstract
BACKGROUND: Rhubarb, traditionally used in China for neurological disorders, has recently attracted considerable scientific attention for its neuroprotective and cerebrovascular benefits. The main therapeutic components of rhubarb are anthraquinones, including emodin, aloe-emodin, chrysophanol, rhein, and physcion. Accumulating experimental evidence indicates that anthraquinones are of importance in neurodegenerative diseases (NDDs), such as Alzheimer's disease, Parkinson's disease, Huntington's disease, and multiple sclerosis. However, as a promising candidate for drug development, the mechanisms by which anthraquinones treat NDDs have not been systematically reviewed. Therefore, this article outlines the anti-neurodegenerative effects of anthraquinones, focusing on their molecular mechanisms. OBJECTIVE: This article reviews recent research progress of anthraquinones in NDDs, focusing on their potential targets and pathways to provide new ideas for the intervention and treatment of ND
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🏥 Translation
🧬 3D Protein Structure — NAMPT
No curated PDB or AlphaFold mapping for NAMPT yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for NAMPT from GTEx v10.
💉 Clinical Trials (6)Relevance: 12%
1
Active
Active
5
Completed
Completed
0
Total Enrolled
Total Enrolled
Phase II
Highest Phase
Highest Phase
Completed·NCT03731923
Recruiting·NCT05617508
Completed·NCT04430517
Completed·NCT01504854
Completed·NCT03482167
Completed·NCT02942888
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💰 Estimated Development
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$0
Timeline
18 months
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Volatility
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Events (7d)
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🔮 Predictions
🔎 Predictions vs Observations1 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| If hypothesis is true, intervention targeting NAMPT will achieve: NAMPT overexpression or NAD+ salvage pathway enhancement increases intracellular NAD+ levels and improves neuronal survival in vitro o | NAMPT overexpression or NAD+ salvage pathway enhancement increases intracellular NAD+ levels and improves neuronal survival in vitro or in vivo within 6-12 mont | — no observation — | pending | 0.89 |
🔮 Falsifiable Predictions (1)
pendingconf 89%
If hypothesis is true, intervention targeting NAMPT will achieve: NAMPT overexpression or NAD+ salvage pathway enhancement increases intracellular NAD+ levels and improves neuronal survival in vitro or in vivo within 6-12 months
Predicted outcome: NAMPT overexpression or NAD+ salvage pathway enhancement increases intracellular NAD+ levels and improves neuronal survival in vitro or in vivo within
Falsification: NAMPT enhancement does not significantly increase NAD+ or improve neuronal survival
▸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%
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0%
Debates
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