ID: h-var-4eca108177
Hypothesis
Closed-loop tACS targeting EC-II parvalbumin interneurons to restore gamma rhythmogenesis and block tau AIS disruption in AD
Parvalbumin-positive (PV+) fast-spiking interneurons in entorhinal cortex layers II–III generate perisomatic gamma oscillations through precisely timed GABA release at basket cell synapses and axon initial segment (AIS) contacts via chan.
neuroscience
EvidencePending (0%)📖 64 cit🗣 2 debates✓ 38 support✗ 13 oppose
⚠ Low Validation Senate Quality Gates →
🧪 Overview
Mechanistic Overview
Parvalbumin-positive (PV+) fast-spiking interneurons in entorhinal cortex layers II–III generate perisomatic gamma oscillations through precisely timed GABA release at basket cell synapses and axon initial segment (AIS) contacts via chandelier cells. In Alzheimer's disease, hyperphosphorylated tau disrupts the subcellular localization of AnkyrinG, a critical scaffolding protein that anchors voltage-gated sodium channel (VGSC) clusters at the AIS of PV interneurons. This tau-mediated AnkyrinG displacement leads to VGSC dispersal and reduced sodium current density, compromising the high-frequency firing capacity essential for gamma rhythmogenesis. The resulting impairment in perisomatic inhibitory control disrupts the temporal precision of stellate cell networks that underlie spatial navigation and memory encoding in the entorhinal-hippocampal circuit. [1]
Molecular and Cellular Rationale
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🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
graph TD
SST["SST gene<br/>somatostatin interneurons"] --> PV["PV+ interneurons<br/>parvalbumin positive"]
PV --> GAMMA_GEN["Gamma oscillation<br/>generation 40Hz"]
GAMMA_GEN --> HIPP_SYNC["Hippocampal<br/>gamma rhythm"]
GAMMA_GEN --> CORT_SYNC["Cortical<br/>gamma rhythm"]
AMYLOID["Amyloid beta<br/>accumulation"] --> GAMMA_RED["Reduced gamma power<br/>40-70% decrease"]
TAU["Tau pathology<br/>neurofibrillary tangles"] --> GAMMA_RED
GAMMA_RED --> DESYNC["Hippocampal-cortical<br/>desynchronization"]
DESYNC --> MEM_IMP["Memory impairment<br/>encoding and retrieval"]
GET["Gamma entrainment<br/>therapy 40Hz"] --> GAMMA_REST["Gamma rhythm<br/>restoration"]
GAMMA_REST --> SYNC_REC["Synchrony recovery<br/>between regions"]
SYNC_REC --> MEM_IMPROVE["Memory function<br/>improvement"]
HIPP_SYNC --> SYNC_NORM["Normal hippocampal-<br/>cortical synchrony"]
CORT_SYNC --> SYNC_NORM
SYNC_NORM --> MEM_NORM["Normal memory<br/>function"]
style SST fill:#ce93d8,color:#0d0d1a
style PV fill:#4fc3f7,color:#0d0d1a
style GAMMA_GEN fill:#4fc3f7,color:#0d0d1a
style HIPP_SYNC fill:#4fc3f7,color:#0d0d1a
style CORT_SYNC fill:#4fc3f7,color:#0d0d1a
style SYNC_NORM fill:#4fc3f7,color:#0d0d1a
style MEM_NORM fill:#4fc3f7,color:#0d0d1a
style AMYLOID fill:#ef5350,color:#0d0d1a
style TAU fill:#ef5350,color:#0d0d1a
style GAMMA_RED fill:#ef5350,color:#0d0d1a
style DESYNC fill:#ef5350,color:#0d0d1a
style MEM_IMP fill:#ef5350,color:#0d0d1a
style GET fill:#81c784,color:#0d0d1a
style GAMMA_REST fill:#81c784,color:#0d0d1a
style SYNC_REC fill:#ffd54f,color:#0d0d1a
style MEM_IMPROVE fill:#ffd54f,color:#0d0d1a⚖️ Evidence
⚖️ Evidence Matrix38 supports13 contradicts
Supports
40 Hz gamma entrainment reduces amyloid and tau pathology in 5XFAD and tau P301S mice
Abstract
Neuronal and synaptic loss is characteristic in many neurodegenerative diseases, such as frontotemporal dementia and Alzheimer's disease. Recently, we showed that inducing gamma oscillations with visual stimulation (gamma entrainment using sensory stimuli, or GENUS) reduced amyloid plaques and phosphorylated tau in multiple mouse models. Whether GENUS can affect neurodegeneration or cognitive performance remains unknown. Here, we demonstrate that GENUS can entrain gamma oscillations in the visual cortex, hippocampus, and prefrontal cortex in Tau P301S and CK-p25 mouse models of neurodegeneration. Tau P301S and CK-p25 mice subjected to chronic, daily GENUS from the early stages of neurodegeneration showed a preservation of neuronal and synaptic density across multiple brain areas and modified cognitive performance. Our transcriptomic and phosphoproteomic data suggest that chronic GENUS shifts neurons to a less degenerative state, improving synaptic function, enhancing neuroprotective fa
Supports
Parvalbumin interneurons are critical for gamma oscillation generation and cognitive function
Abstract
Hippocampal-cortical circuit oscillations in local field potential (LFP) represent network-level signals which promotes behavior. Investigating these signals promote our understanding on how the brain process cognition and emotion, and provide further perspectives into electroencephalogram endophenotypes, especially under the pathological state. The physiological adaptive stress responses to threatening stimuli are critical for individuals. The disturbance of stress response may lead to psychiatric disorders such as major depressive disorder (MDD). To quantitatively examine the effects of acute stress on hippocampal-cortical circuit, we recorded LFPs in the hippocampus (HC) and the medial prefrontal cortex (mPFC). We analyzed three major LFP oscillations with their temporal coupling. Consistent with our hypothesis that strengthened communication of hippocampal-cortical circuit may occur in stress adaption, we found that intensive acute stress induced enhanced ripple-delta-spindle coupl
Supports
Gamma stimulation enhances microglial phagocytosis through mechanosensitive channel activation
Abstract
Influenza infection is substantially worsened by the onset of secondary pneumonia caused by bacteria, such as methicillin-resistant Staphylococcus aureus (MRSA). The bidirectional interaction between the influenza-injured lung microenvironment and MRSA is poorly understood. By conditioning MRSA ex vivo in bronchoalveolar lavage fluid collected from mice at various time points of influenza infection, we found that the influenza-injured lung microenvironment dynamically induces MRSA to increase cytotoxin expression while decreasing metabolic pathways. LukAB, a SaeRS two-component system-dependent cytotoxin, is particularly important to the severity of post-influenza MRSA pneumonia. LukAB's activity is likely shaped by the post-influenza lung microenvironment, as LukAB binds to (and is activated by) heparan sulfate (HS) oligosaccharide sequences shed from the epithelial glycocalyx after influenza. Our findings indicate that post-influenza MRSA pneumonia is shaped by bidirectional host-pat
Supports
40 Hz audiovisual stimulation shows safety and potential efficacy in mild AD patients (GENUS trial)
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
Gamma oscillations restore hippocampal-cortical synchrony and improve memory in AD mouse models
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
Multi-modal gamma entrainment shows enhanced efficacy over single-modality stimulation
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
40 Hz light flicker reduces amyloid plaques and phospho-tau in visual cortex of 5xFAD mice via microglial phagocytosis
Abstract
Changes in gamma oscillations (20-50 Hz) have been observed in several neurological disorders. However, the relationship between gamma oscillations and cellular pathologies is unclear. Here we show reduced, behaviourally driven gamma oscillations before the onset of plaque formation or cognitive decline in a mouse model of Alzheimer's disease. Optogenetically driving fast-spiking parvalbumin-positive (FS-PV)-interneurons at gamma (40 Hz), but not other frequencies, reduces levels of amyloid-β (Aβ)1-40 and Aβ 1-42 isoforms. Gene expression profiling revealed induction of genes associated with morphological transformation of microglia, and histological analysis confirmed increased microglia co-localization with Aβ. Subsequently, we designed a non-invasive 40 Hz light-flickering regime that reduced Aβ1-40 and Aβ1-42 levels in the visual cortex of pre-depositing mice and mitigated plaque load in aged, depositing mice. Our findings uncover a previously unappreciated function of gamma rhythm
Supports
Combined auditory and visual 40 Hz stimulation entrains gamma oscillations across hippocampus and prefrontal cortex with synergistic amyloid reduction
Abstract
Over the past two decades efforts to control malaria have halved the number of cases globally, yet burdens remain high in much of Africa and the elimination of malaria has not been achieved even in areas where extreme reductions have been sustained, such as South Africa1,2. Studies seeking to understand the paradoxical persistence of malaria in areas in which surface water is absent for 3-8 months of the year have suggested that some species of Anopheles mosquito use long-distance migration3. Here we confirm this hypothesis through aerial sampling of mosquitoes at 40-290 m above ground level and provide-to our knowledge-the first evidence of windborne migration of African malaria vectors, and consequently of the pathogens that they transmit. Ten species, including the primary malaria vector Anopheles coluzzii, were identified among 235 anopheline mosquitoes that were captured during 617 nocturnal aerial collections in the Sahel of Mali. Notably, females accounted for more than 80% of a
Supports
Phase I clinical trial of 40 Hz sensory stimulation shows safety and increased gamma power in mild AD patients over 6 months
Abstract
CRISPR-Cas9 expression independent of its cognate synthetic guide RNA (gRNA) causes widespread genomic DNA damage in human cells. To investigate whether Cas9 can interact with endogenous human RNA transcripts independent of its guide, we perform eCLIP (enhanced CLIP) of Cas9 in human cells and find that Cas9 reproducibly interacts with hundreds of endogenous human RNA transcripts. This association can be partially explained by a model built on gRNA secondary structure and sequence. Critically, transcriptome-wide Cas9 binding sites do not appear to correlate with published genome-wide Cas9 DNA binding or cut-site loci under gRNA co-expression. However, even under gRNA co-expression low-affinity Cas9-human RNA interactions (which we term CRISPR crosstalk) do correlate with published elevated transcriptome-wide RNA editing. Our findings do not support the hypothesis that human RNAs can broadly guide Cas9 to bind and cleave human genomic DNA, but they illustrate a cellular and RNA impact l
Supports
Gamma entrainment promotes vascular clearance of amyloid via pericyte activation and arterial pulsatility enhancement
Abstract
PURPOSE: The purpose of this study was to identify if switching from intramuscular (IM) to vaginal progesterone compared to staying on IM progesterone after a positive pregnancy test following embryo transfer (ET) is associated with miscarriage risk. METHODS: A retrospective cohort study was performed in a private university-affiliated fertility clinic and included women aged 18-50 years with a positive pregnancy test following ET. The two groups studied were: women who stayed on IM progesterone following a positive pregnancy test and those who switched to vaginal progesterone after a positive test. The main outcome measured was risk of miscarriage < 24 weeks gestation as a proportion of non-biochemical pregnancies. RESULTS: 1988 women were included in the analysis. Among the baseline characteristics, the presence of prior miscarriages as well as prior failed ETs, and frozen cycles (vs fresh) as type of transfer were associated with IM progesterone use (p values ≤ 0.01). As per miscarr
Supports
A specific circuit in the midbrain detects stress and induces restorative sleep.
Abstract
In mice, social defeat stress (SDS), an ethological model for psychosocial stress, induces sleep. Such sleep could enable resilience, but how stress promotes sleep is unclear. Activity-dependent tagging revealed a subset of ventral tegmental area γ-aminobutyric acid (GABA)-somatostatin (VTAVgat-Sst) cells that sense stress and drive non-rapid eye movement (NREM) and REM sleep through the lateral hypothalamus and also inhibit corticotropin-releasing factor (CRF) release in the paraventricular hypothalamus. Transient stress enhances the activity of VTAVgat-Sst cells for several hours, allowing them to exert their sleep effects persistently. Lesioning of VTAVgat-Sst cells abolished SDS-induced sleep; without it, anxiety and corticosterone concentrations remained increased after stress. Thus, a specific circuit allows animals to restore mental and body functions by sleeping, potentially providing a refined route for treating anxiety disorders.
Supports
25th Annual Computational Neuroscience Meeting: CNS-2016.
Abstract
A1 Functional advantages of cell-type heterogeneity in neural circuits Tatyana O. Sharpee A2 Mesoscopic modeling of propagating waves in visual cortex Alain Destexhe A3 Dynamics and biomarkers of mental disorders Mitsuo Kawato F1 Precise recruitment of spiking output at theta frequencies requires dendritic h-channels in multi-compartment models of oriens-lacunosum/moleculare hippocampal interneurons Vladislav Sekulić, Frances K. Skinner F2 Kernel methods in reconstruction of current sources from extracellular potentials for single cells and the whole brains Daniel K. Wójcik, Chaitanya Chintaluri, Dorottya Cserpán, Zoltán Somogyvári F3 The synchronized periods depend on intracellular transcriptional repression mechanisms in circadian clocks. Jae Kyoung Kim, Zachary P. Kilpatrick, Matthew R. Bennett, Kresimir Josić O1 Assessing irregularity and coordination of spiking-bursting rhythms in central pattern generators Irene Elices, David Arroyo, Rafael Levi, Francisco B. Rodriguez, Pablo Var
Supports
Inhibition of GABA interneurons in the mPFC is sufficient and necessary for rapid antidepressant responses.
Abstract
Major depressive disorder (MDD) is associated with alterations of GABAergic interneurons, notably somatostatin (Sst) as well as parvalbumin (Pvalb), in cortical brain areas. In addition, the antidepressant effects of rapid-acting drugs are thought to occur via inhibition of GABA interneurons. However, the impact of these interneuron subtypes in affective behaviors as well as in the effects of rapid-acting antidepressants remains to be determined. Here, we used a Cre-dependent DREADD-chemogenetic approach to determine if inhibition of GABA interneurons in the mPFC of male mice is sufficient to produce antidepressant actions, and conversely if activation of these interneurons blocks the rapid and sustained antidepressant effects of scopolamine, a nonselective acetylcholine muscarinic receptor antagonist. Chemogenetic inhibition of all GABA interneurons (Gad1+), as well as Sst+ and Pvalb+ subtypes in the mPFC produced dose and time-dependent antidepressant effects in the forced swim and n
Supports
[(131)I]N-(6-amino-2,2,4-trimethylhexyl)-2-[(5-iodo(3-pyridyl))carbonylamino]-3-(2-napthyl)propanamide.
Abstract
An autoimmune process and other environmental factors that destroy pancreatic β cells in the pancreatic islet cells are known to promote the development of insulin-dependent diabetes mellitus (type 1 diabetes) in individuals genetically predisposed to the disease (1). As a consequence of the β cell destruction, the net mass of these cells in the islet cells is reduced and, due to reduced insulin production, maintenance of blood glucose to a proper physiological level is impaired. The most common
Supports
(177)Lu-DOTA-Tyr(3)-c(Cys-Tyr-Trp-Lys-Thr-Cys)-Thr-Lys(cypate)-NH(2).
Abstract
Somatostatin (SST) (somatotropin release-inhibiting hormone, somatotropin release-inhibiting factor) is a cyclic disulphide-containing peptide hormone of 14 amino acids (1). SST inhibits hormone secretion, cell proliferation, and promotes apoptosis through binding to specific cell-surface somatostatin receptors (SSTRs) (2). Five SSTR subtypes are identified in the central nervous system (CNS), gastrointestinal tract, and a variety of benign and malignant tumors (2). All subtypes of SSTRs belong
Supports
Novel App knock-in mouse model shows key features of amyloid pathology and reveals profound metabolic dysregulation of microglia.
Abstract
BACKGROUND: Genetic mutations underlying familial Alzheimer's disease (AD) were identified decades ago, but the field is still in search of transformative therapies for patients. While mouse models based on overexpression of mutated transgenes have yielded key insights in mechanisms of disease, those models are subject to artifacts, including random genetic integration of the transgene, ectopic expression and non-physiological protein levels. The genetic engineering of novel mouse models using knock-in approaches addresses some of those limitations. With mounting evidence of the role played by microglia in AD, high-dimensional approaches to phenotype microglia in those models are critical to refine our understanding of the immune response in the brain. METHODS: We engineered a novel App knock-in mouse model (AppSAA) using homologous recombination to introduce three disease-causing coding mutations (Swedish, Arctic and Austrian) to the mouse App gene. Amyloid-β pathology, neurodegenerat
Supports
Molecular hallmarks of excitatory and inhibitory neuronal resilience and resistance to Alzheimer's disease.
Abstract
BACKGROUND: A significant proportion of individuals maintain healthy cognitive function despite having extensive Alzheimer's disease (AD) pathology, known as cognitive resilience. Understanding the molecular mechanisms that protect these individuals can identify therapeutic targets for AD dementia. This study aims to define molecular and cellular signatures of cognitive resilience, protection and resistance, by integrating genetics, bulk RNA, and single-nucleus RNA sequencing data across multiple brain regions from AD, resilient, and control individuals. METHODS: We analyzed data from the Religious Order Study and the Rush Memory and Aging Project (ROSMAP), including bulk (n=631) and multi-regional single nucleus (n=48) RNA sequencing. Subjects were categorized into AD, resilient, and control based on β-amyloid and tau pathology, and cognitive status. We identified and prioritized protected cell populations using whole genome sequencing-derived genetic variants, transcriptomic profilin
Supports
Parvalbumin neuroplasticity compensates for somatostatin impairment, maintaining cognitive function in Alzheimer's disease.
Abstract
BACKGROUND: Patient-to-patient variability in the degree to which β-amyloid, tau and neurodegeneration impact cognitive decline in Alzheimer's disease (AD) complicates disease modeling and treatment. However, the underlying mechanisms leading to cognitive resilience are not resolved. We hypothesize that the variability in cognitive function and loss relates to neuronal resilience of the hippocampal GABAergic network. METHODS: We compared TgF344-AD and non-transgenic littermate rats at 9, 12, and 15 months of age. Neurons, β-amyloid plaques and tau inclusions were quantified in hippocampus and entorhinal cortex. Somatostatin (SST) and parvalbumin (PVB) interneurons were traced to examine hippocampal neuroplasticity and cognition was tested in the Barnes maze. RESULTS: The 9-month-old TgF344-AD rats exhibited loss of neurons in the entorhinal cortex and hippocampus. Hippocampal neuronal compensation was observed in 12-month TgF344-AD rats, with upregulation of GABAergic interneuronal mar
Supports
Molecular hallmarks of excitatory and inhibitory neuronal resilience to Alzheimer's disease.
Abstract
BACKGROUND: A significant proportion of individuals maintain cognition despite extensive Alzheimer's disease (AD) pathology, known as cognitive resilience. Understanding the molecular mechanisms that protect these individuals could reveal therapeutic targets for AD. METHODS: This study defines molecular and cellular signatures of cognitive resilience by integrating bulk RNA and single-cell transcriptomic data with genetics across multiple brain regions. We analyzed data from the Religious Order Study and the Rush Memory and Aging Project (ROSMAP), including bulk RNA sequencing (n = 631 individuals) and multiregional single-nucleus RNA sequencing (n = 48 individuals). Subjects were categorized into AD, resilient, and control based on β-amyloid and tau pathology, and cognitive status. We identified and prioritized protected cell populations using whole-genome sequencing-derived genetic variants, transcriptomic profiling, and cellular composition. RESULTS: Transcriptomics and polygenic ri
Supports
Regional interneuron transcriptional changes reveal pathologic markers of disease progression in a mouse model of Alzheimer's disease.
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder and leading cause of dementia, characterized by neuronal and synapse loss, amyloid-β and tau protein aggregates, and a multifactorial pathology involving neuroinflammation, vascular dysfunction, and disrupted metabolism. Additionally, there is growing evidence of imbalance between neuronal excitation and inhibition in the AD brain secondary to dysfunction of parvalbumin (PV)- and somatostatin (SST)-positive interneurons, which differentially modulate neuronal activity. Importantly, impaired interneuron activity in AD may occur upstream of amyloid-β pathology rendering it a potential therapeutic target. To determine the underlying pathologic processes involved in interneuron dysfunction, we spatially profiled the brain transcriptome of the 5XFAD AD mouse model versus controls, across four brain regions, dentate gyrus, hippocampal CA1 and CA3, and cortex, at early-stage (12 weeks-of-age) and late-stage (30 weeks-of-age)
Supports
Quantitative proteomic analysis of the frontal cortex in Alzheimer's disease.
Abstract
Alzheimer's disease (AD) is a chronic neurodegenerative disease characterized by intracellular formation of neurofibrillary tangles and extracellular deposition of β-amyloid protein (Aβ) in the extracellular matrix. The pathogenesis of AD has not yet been fully elucidated and little is known about global alterations in the brain proteome that are related to AD. To identify and quantify such AD-related changes in the brain, we employed a tandem mass tags approach coupled to high-resolution mass spectrometry. We compared the proteomes of frontal cortex from AD patients with corresponding age-matched brain samples. Liquid chromatography-mass spectrometry/MS analysis carried out on an Orbitrap Fusion Lumos Tribrid mass spectrometer led to identification of 8,066 proteins. Of these, 432 proteins were observed to be significantly altered (>1.5 fold) in their expression in AD brains. Proteins whose abundance was previously known to be altered in AD were identified including secreted phosphopr
Supports
CXCL9, CXCL10, CXCL11, and their receptor (CXCR3) in neuroinflammation and neurodegeneration.
Abstract
The aim of this review is to present data from the available literature concerning CXCL9, CXCL10 and CXCL11, as well as their receptor 3 (CXCR3) in selected diseases of the central nervous system (CNS), such as tickborne encephalitis (TBE), neuroborreliosis (NB), Alzheimer's disease (AD), and multiple sclerosis (MS). CXCL9, CXCL10, and CXCL11 lack glutamic acid-leucine-arginine (ELR), and are unique, because they are more closely related to each other than to any other chemokine. The aforementioned chemokines are especially involved in Th1-type response and in various diseases, as their expression correlates with the tissue infiltration of T cells. Their production is strongly induced by interferon gamma (IFN-υ), the most typical Th1 cytokine. They act by binding to the CXC3 receptor. Knowledge about the action mechanism of CXCR3 and its ligands may be useful in the treatment of CNS diseases. However, data in the literature concerning the evaluation of CXCL9, CXCL10, CXCL11, and their
Supports
GADD45G operates as a pathological sensor orchestrating reactive gliosis and neurodegeneration.
Abstract
Reactive gliosis is a hallmark of neuropathology and offers a potential target for addressing numerous neurological diseases. Here, we show that growth arrest and DNA damage inducible gamma (GADD45G), a stress sensor in astrocytes, is a nodal orchestrator of reactive gliosis and neurodegeneration. GADD45G expression in astrocytes is sufficient to incite astrogliosis, microgliosis, synapse loss, compromised animal behavior, and the aggravation of Alzheimer's disease (AD). Conversely, silencing GADD45G specifically in astrocytes preserves synapses and rescues the histological and behavioral phenotypes of AD. Mechanistically, GADD45G controls the mitogen-activated protein kinase kinase kinase 4 (MAP3K4) and neuroimmune signaling pathways, including nuclear factor κB (NF-κB) and interferon regulatory factor 3 (IRF3), leading to profound molecular changes and the secretion of various factors that regulate both cell-autonomous and cell-nonautonomous reactive gliosis and glia-neuron interacti
Supports
Molecular pathogenesis of polymerase γ-related neurodegeneration.
Abstract
OBJECTIVE: Polymerase gamma (POLG) mutations are a common cause of mitochondrial disease and have also been linked to neurodegeneration and aging. We studied the molecular mechanisms underlying POLG-related neurodegeneration using postmortem tissue from a large number of patients. METHODS: Clinical information was available from all subjects. Formalin-fixed and frozen brain tissue from 15 patients and 23 controls was studied employing a combination of histopathology, immunohistochemistry, and molecular studies of microdissected neurons. RESULTS: The primary consequence of POLG mutation in neurons is mitochondrial DNA depletion. This was already present in infants with little evidence of neuronal loss or mitochondrial dysfunction. With longer disease duration, we found an additional, progressive accumulation of mitochondrial DNA deletions and point mutations accompanied by increasing numbers of complex I-deficient neurons. Progressive neurodegeneration primarily affected the cerebellar
Supports
Mitochondrial biogenesis in neurodegeneration.
Abstract
Mitochondria play a key role in energy production, calcium homeostasis, cell survival, and death. Adverse stimulations including neurodegenerative diseases may result in mitochondrial dynamic imbalance, free radical production, calcium accumulation, intrinsic cell death pathway activation and eventually cell death. Therefore, preserving or promoting mitochondrial function is a potential therapeutic target for the treatment of neurodegenerative disorders. Mitochondrial biogenesis is a process by which new mitochondria are produced from existing mitochondria. This biogenesis process is regulated by Peroxisome proliferator-activated receptor-gamma (PPARγ) coactivator-1alpha (PGC-1α). Once being activated by either phosphorylation or de-acetylation, PGC-1α activates nuclear respiratory factor 1 and 2 (NRF1 and NRF2), and subsequently mitochondrial transcription factor A (Tfam). The activation of this PGC-1α - NRF -Tfam pathway leads to synthesis of mitochondrial DNA and proteins and genera
Supports
Paracrine inhibition via G protein inwardly rectifying potassium channels regulates glucagon secretion from human pancreatic alpha cells.
Abstract
Impaired glucagon secretion from pancreatic alpha cells is a cause of life-threatening hypoglycemia in individuals with type 1 diabetes (T1D). The mechanisms that lead to defective glucagon secretion remain unclear. Here, we show that the human alpha cell's competence to secrete glucagon depends on paracrine inhibitory input from beta (serotonin [5-HT], γ-aminobutyric acid [GABA]) and delta (somatostatin [SST]) cells. These paracrine signals activate G protein-coupled receptors (GPCRs) that open G protein-gated inwardly rectifying potassium (GIRK) channels, which have a major impact on glucagon secretion. In the absence of this paracrine input, glucagon secretion progressively diminishes until it habituates completely. Strikingly, 5-HT, GABA, and SST restored impaired glucagon secretion in islets from donors with long-duration T1D. These findings indicate that paracrine inhibition is needed to prevent habituation of glucagon secretion. As beta cells are destroyed in T1D, alpha cells lo
Supports
Subtype-Specific Roles of Anterior Cingulate Cortex Neurons in Pain-Induced Social Deficits in Mice.
Abstract
RATIONALE: Pain is frequently accompanied by impairments in social behavior; however, the neural circuitry underlying pain-induced social deficits remains poorly understood. The aim of the present study was to delineate the distinct functional roles of γ-aminobutyric acid-releasing (GABAergic) neurons and calcium/calmodulin-dependent protein kinase II-positive (CaMKII+) neurons in the anterior cingulate cortex (ACC) in mediating pain-induced social deficits. METHODS: Mouse models of inflammatory and neuropathic pain were employed. Optogenetic and chemogenetic approaches, combined with fiber photometry, were used to manipulate and monitor the activity of ACC neuronal subtypes. Social behaviors were assessed using the three-chamber social interaction test. Mechanical and thermal pain sensitivity were evaluated using von Frey filaments and the Hargreaves test, respectively. RESULTS: Mice with chronic pain exhibited deficits in social preference and novelty. In vivo calcium imaging reveale
Supports
Anatomical and neurochemical profiles of somatostatin-positive neurons in the mouse inferior colliculus.
Abstract
The inferior colliculus (IC) integrates auditory information through a complex interplay of excitatory and inhibitory neurons, and provides both excitatory and inhibitory inputs to the medial geniculate body (MGB). Although IC projection neurons are predominantly glutamatergic, accumulating evidence suggests that they comprised heterogeneous subpopulations with distinct morphological and functional properties. Somatostatin (SST)-expressing neurons represent one such glutamatergic subpopulation; however, their characteristics and circuit organization remain poorly understood. In this study, we examined the projection domains within the MGB and the local circuits of SST-expressing neurons in the IC. SST-expressing neurons in the central nucleus of the IC (CNIC) project mainly to the ventral division of the MGB (MGv) and posterior limiting nucleus (POL), whereas those in the external (ECIC) and dorsal (DCIC) nuclei primarily target the POL. The SST axon terminals in the MGv were large, fo
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Altered Expression of GABA-Related Genes in Schizophrenia: Insights from Meta-Analyses of Brain and Blood Samples and iPSC-Derived Organoids.
Abstract
BACKGROUND: Schizophrenia, one of the most disabling mental disorders, affects approximately seven per 1000 individuals worldwide and has an estimated heritability of around 80%; however, its pathophysiology remains incompletely understood. The disorder has been linked to dysregulation of multiple neurotransmitter systems, including dopamine, serotonin, γ-aminobutyric acid (GABA), and glutamate. GABA, the primary inhibitory neurotransmitter in the central nervous system, is synthesized by the enzymes glutamic acid decarboxylase 67 (GAD67) and glutamic acid decarboxylase 65 (GAD65), encoded by the GAD1 and GAD2 genes, respectively. The genes (SST) and parvalbumin (PVALB) encode somatostatin and parvalbumin, which are characteristic markers of specialized GABAergic interneuron subpopulations involved in maintaining excitatory-inhibitory balance and supporting cortical circuit function. While reduced GAD1 expression has been consistently reported in schizophrenia, findings regarding GAD2
Supports
Epigenetically regulated pancreatic GABA-somatostatin signaling underlies gestational diabetes-induced glucose intolerance in offspring.
Abstract
Gestational diabetes mellitus (GDM) can increase the risk for diabetes in offspring, but the mechanisms underlying the effects of intrauterine hyperglycemia (IHG) on the fetus remain unknown. Here, we show that IHG down-regulated DNA demethylases TET2/3 in fetal pancreatic islets, increased DNA methylation of γ-aminobutyric acid (GABA) synthesis gene Gad1, suppressed Gad1 expression, and elevated somatostatin (SST) protein in the pancreas in mice. Pancreas-specific double knockout (DKO) of Tet2/3 recapitulates the IHG effects, causing Gad1 hypermethylation and expression down-regulation, alongside impaired insulin secretion and glucose tolerance. Metabolomic analysis revealed that IHG and Tet2/3 DKO reduced pancreatic GABA content. Gestational dietary GABA supplementation improved metabolic defects in both IHG and Tet2/3 DKO models. scRNA-seq analysis of pancreatic islets showed that IHG or Tet2/3 DKO down-regulated the β cell signature, whereas up-regulating δ cell-related genes, part
Contradicts
Translation to human studies has shown mixed results with small effect sizes
Abstract
BACKGROUND: Tremor is one of the most prevalent symptoms in Parkinson's Disease (PD). The progression and management of tremor in PD can be challenging, as response to dopaminergic agents might be relatively poor, particularly in patients with tremor-dominant PD compared to the akinetic/rigid subtype. In this review, we aim to highlight recent advances in the underlying pathogenesis and treatment modalities for tremor in PD. METHODS: A structured literature search through Embase was conducted using the terms "Parkinson's Disease" AND "tremor" OR "etiology" OR "management" OR "drug resistance" OR "therapy" OR "rehabilitation" OR "surgery." After initial screening, eligible articles were selected with a focus on published literature in the last 10 years. DISCUSSION: The underlying pathophysiology of tremor in PD remains complex and incompletely understood. Neurodegeneration of dopaminergic neurons in the retrorubral area, in addition to high-power neural oscillations in the cerebello-tha
Contradicts
Optimal stimulation parameters remain unclear across different AD stages
Abstract
Magnetoencephalography (MEG), a direct measure of neuronal activity, is an underexplored tool in the search for biomarkers of Alzheimer's disease (AD). In this study, we used MEG source estimates of auditory gating generators, nonlinear correlations with neuropsychological results, and multivariate analyses to examine the sensitivity and specificity of gating topology modulation to detect AD. Our results demonstrated the use of MEG localization of a medial prefrontal (mPFC) gating generator as a discrete (binary) detector of AD at the individual level and resulted in recategorizing the participant categories in: (1) controls with mPFC generator localized in response to both the standard and deviant tones; (2) a possible preclinical stage of AD participants (a lower functioning group of controls) in which mPFC activation was localized to the deviant tone only; and (3) symptomatic AD in which mPFC activation was not localized to either the deviant or standard tones. This approach showed
Contradicts
Gamma oscillation deficits in AD may reflect network damage rather than a treatable cause, questioning the therapeutic premise
Abstract
Despite expanding knowledge regarding the role of astroglia in regulating neuronal function, little is known about regional or functional subgroups of brain astroglia and how they may interact with neurons. We use an astroglia-specific promoter fragment in transgenic mice to identify an anatomically defined subset of adult gray matter astroglia. Using transcriptomic and histological analyses, we generate a combinatorial profile for the in vivo identification and characterization of this astroglia subpopulation. These astroglia are enriched in mouse cortical layer V; express distinct molecular markers, including Norrin and leucine-rich repeat-containing G-protein-coupled receptor 6 (LGR6), with corresponding layer-specific neuronal ligands; are found in the human cortex; and modulate neuronal activity. Astrocytic Norrin appears to regulate dendrites and spines; its loss, as occurring in Norrie disease, contributes to cortical dendritic spine loss. These studies provide evidence that hum
Contradicts
Sensory gamma entrainment shows rapid habituation with diminished neural response after 2 weeks of daily stimulation
Abstract
Mechanical anisotropy is an essential property for many biomolecules to assume their structures, functions and applications, however, the mechanisms for their direction-dependent mechanical responses remain elusive. Herein, by using a single-molecule nanopore sensing technique, we explore the mechanisms of directional mechanical stability of the xrRNA1 RNA from ZIKA virus (ZIKV), which forms a complex ring-like architecture. We reveal extreme mechanical anisotropy in ZIKV xrRNA1 which highly depends on Mg2+ and the key tertiary interactions. The absence of Mg2+ and disruption of the key tertiary interactions strongly affect the structural integrity and attenuate mechanical anisotropy. The significance of ring structures in RNA mechanical anisotropy is further supported by steered molecular dynamics simulations in combination with force distribution analysis. We anticipate the ring structures can be used as key elements to build RNA-based nanostructures with controllable mechanical anis
Contradicts
Translation of mouse gamma entrainment to humans is limited by skull attenuation and cortical folding differences
Abstract
BACKGROUND: Gamification refers to the use of game elements in nongame contexts. The use of gamification to change behaviors and promote physical activity (PA) is a promising avenue for tackling the global physical inactivity pandemic and the current prevalence of chronic diseases. However, there is no evidence of the effectiveness of gamified interventions with the existence of mixed results in the literature. OBJECTIVE: The aim of this systematic review and meta-analysis is to evaluate the effectiveness of gamified interventions and their health care potential by testing the generalizability and sustainability of their influence on PA and sedentary behavior. METHODS: A total of 5 electronic databases (PubMed, Embase, Scopus, Web of Science, and the Cochrane Central Register of Controlled Trials) were searched for randomized controlled trials published in English from 2010 to 2020. Eligibility criteria were based on the components of the participants, interventions, comparators, and o
Contradicts
Epileptiform activity risk increases with prolonged 40 Hz stimulation in individuals with subclinical seizure susceptibility
Abstract
BACKGROUND: Nettle is a medicinal plant rich in bioactive molecules. The composition of nettle leaves and stems has been extensively studied, whereas the root has been insufficiently investigated. Therefore, the present study aimed to optimize the parameters of advanced extraction technique, pressurized liquid extraction (PLE), for the lipid fraction of nettle root rich in triterpenoid derivatives and to compare the efficiency of isolation under optimal conditions with conventional Soxhlet extraction (SE). RESULTS: The PLE yields ranged from 0.39-1.63%, whereas the total content of triterpenoid derivatives ranged from 43.50-78.26 mg 100 g-1 , with nine sterols and three pentacyclic triterpenoids identified and quantified within a total range of 42.81-76.57 mg 100 g-1 and 0.69-1.68 mg 100 g-1 dried root, respectively. The most abundant sterol and pentacyclic triterpenoid were β-sitosterol and β-amyrin acetate, with mean values of 50.21 mg 100 g-1 and 0.56 mg 100 g-1 dried root. CONCLUSI
Contradicts
Multi-site replication study finds variable gamma entrainment efficiency across AD patients, with APOE4 carriers showing reduced response
Abstract
Despite the promising antitumor activity of SHP2 inhibitors in RAS-dependent tumours, overall responses have been limited by their narrow therapeutic window. Like with all MAPK pathway inhibitors, this is likely the result of compensatory pathway activation mechanisms. However, the underlying mechanisms of resistance to SHP2 inhibition remain unknown. The E3 ligase SMURF2 limits TGFβ activity by ubiquitinating and targeting the TGFβ receptor for proteosome degradation. Using a functional RNAi screen targeting all known phosphatases, we identify that the tyrosine phosphatase SHP2 is a critical regulator of TGFβ activity. Specifically, SHP2 dephosphorylates two key residues on SMURF2, resulting in activation of the enzyme. Conversely, SHP2 depletion maintains SMURF2 in an inactive state, resulting in the maintenance of TGFβ activity. Furthermore, we demonstrate that depleting SHP2 has significant implications on TGFβ-mediated migration, senescence, and cell survival. These effects can be
Contradicts
Somatostatin, Olfaction, and Neurodegeneration.
Abstract
Alzheimer's and Parkinson's diseases are the most prevalent neurodegenerative disorders in aging. Hyposmia has been described as an early symptom that can precede cognitive and motor deficits by decades. Certain regions within the olfactory system, such as the anterior olfactory nucleus, display the neuropathological markers tau and amyloid-β or α-synuclein from the earliest stages of disease progression in a preferential manner. Specific neuronal subpopulations, namely those expressing somatostatin (SST), are preferentially affected throughout the olfactory and limbic systems. SST is a neuropeptide present in a subpopulation of GABAergic interneurons throughout the brain and its main function is to inhibit principal neurons and/or other interneurons. It has been reported that SST expression is reduced by 50% in Alzheimer's disease and that it is related to the formation of Aβ oligomers. The mechanisms underlying the preferential vulnerability of SST-expressing neurons in Alzheimer's d
Contradicts
Somatostatin and the pathophysiology of Alzheimer's disease.
Abstract
Among the central features of Alzheimer's disease (AD) progression are altered levels of the neuropeptide somatostatin (SST), and the colocalisation of SST-positive interneurons (SST-INs) with amyloid-β plaques, leading to cell death. In this theoretical review, I propose a molecular model for the pathogenesis of AD based on SST-IN hypofunction and hyperactivity. Namely, hypofunctional and hyperactive SST-INs struggle to control hyperactivity in medial regions in early stages, leading to axonal Aβ production through excessive presynaptic GABAB inhibition, GABAB1a/APP complex downregulation and internalisation. Concomitantly, excessive SST-14 release accumulates near SST-INs in the form of amyloids, which bind to Aβ to form toxic mixed oligomers. This leads to differential SST-IN death through excitotoxicity, further disinhibition, SST deficits, and increased Aβ release, fibrillation and plaque formation. Aβ plaques, hyperactive networks and SST-IN distributions thereby tightly overlap
Contradicts
Functional Amyloids and their Possible Influence on Alzheimer Disease.
Abstract
Amyloids play critical roles in human diseases but have increasingly been recognized to also exist naturally. Shared physicochemical characteristics of amyloids and of their smaller oligomeric building blocks offer the prospect of molecular interactions and crosstalk amongst these assemblies, including the propensity to mutually influence aggregation. A case in point might be the recent discovery of an interaction between the amyloid β peptide (Aβ) and somatostatin (SST). Whereas Aβ is best known for its role in Alzheimer disease (AD) as the main constituent of amyloid plaques, SST is intermittently stored in amyloid-form in dense core granules before its regulated release into the synaptic cleft. This review was written to introduce to readers a large body of literature that surrounds these two peptides. After introducing general concepts and recent progress related to our understanding of amyloids and their aggregation, the review focuses separately on the biogenesis and interactions
Contradicts
Therapeutic Potential of Somatostatin and Its Analogues in Alzheimer's Disease: From Molecular Mechanisms to Preclinical Studies.
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder with limited treatment options. Currently approved agents, such as acetylcholinesterase inhibitors and NMDA receptor antagonists, provide only modest symptomatic benefit without modifying disease progression. Increasing evidence highlights the somatostatin (SST) system and its analogues (SSAs) as potential multitarget therapies. Somatostatin receptors (SSTR1-5) are widely expressed in cognition-related brain regions and participate in amyloid-β metabolism, tau phosphorylation, neuroinflammation, and synaptic plasticity. Preclinical studies suggest that SSAs enhance amyloid clearance via neprilysin activation, attenuate tau pathology through PI3K/Akt signaling, regulate APOE4 expression, and modulate microglial function, thereby protecting synaptic integrity. Compared with current monotherapies, SSAs may provide broader therapeutic benefits, particularly if applied in prodromal or early stages of AD. Advances in delive
Contradicts
From stress to Alzheimer's: A circuit-based framework for prefrontal cognitive dysfunction.
Abstract
Impairments in working memory and cognitive flexibility are early and consistent features of both Alzheimer's disease (AD) and stress. These functions depend critically on prefrontal cortical (PFC) circuits, which are particularly vulnerable to neuromodulatory and pathological insults. Recent studies suggest that stress and AD do not simply act globally, but instead converge on specific molecular and cellular targets within distinct neural populations. Notably, both chronic stress and Alzheimer's disease models exhibit dysregulation of synaptic signaling via NR2B-containing NMDA receptors and aberrant GSK-3β activation. These changes often emerge in a cell-type-specific manner, affecting excitatory pyramidal neurons and vulnerable interneuron subtypes such as SST+, PV+, and VIP + cells. The resulting imbalance in excitation and inhibition disrupts the integrity of prefrontal circuits, impairing adaptive behavior. This review synthesizes evidence across molecular, cellular, and circuit
Contradicts
Hippocampal Interneurons Shape Spatial Coding Alterations in Neurological Disorders.
Abstract
Hippocampal interneurons (INs) play a fundamental role in regulating neural oscillations, modulating excitatory circuits, and shaping spatial representation. While historically overshadowed by excitatory pyramidal cells in spatial coding research, recent advances have demonstrated that inhibitory INs not only coordinate network dynamics but also contribute directly to spatial information processing. This review aims to provide a novel integrative perspective on how distinct IN subtypes participate in spatial coding and how their dysfunction contributes to cognitive deficits in neurological disorders such as epilepsy, Alzheimer's disease (AD), traumatic brain injury (TBI), and cerebral hypoxia-ischemia. We synthesize recent findings demonstrating that different IN classes-including parvalbumin (PV)-, somatostatin (SST)-, cholecystokinin (CCK)-, and calretinin (CR)-expressing neurons-exhibit spatially selective activity, challenging traditional views of spatial representation, and influe
📖 Linked Papers (2)Export BibTeX ↗
Targeting Neural Oscillations for Cognitive Enhancement in Alzheimer’s Disease
{'name': 'Medicina', 'volume': '61'} (2025) · PubMed:40142358 ↗
No figures
Impact of 40 Hz Transcranial Alternating Current Stimulation on Cerebral Tau Burden in Patients with Alzheimer’s Disease: A Case Series
{'name': "Journal of Alzheimer's Disease", 'pages': '1667 - 1676', 'volume': '85'} (2021) · PubMed:34958021 ↗
No figures
🏥 Translation
🧬 3D Protein Structure — PVALB
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for PVALB from GTEx v10.
💉 Clinical Trials (3)Relevance: 32%
0
Active
Active
0
Completed
Completed
270
Total Enrolled
Total Enrolled
PHASE1
Highest Phase
Highest Phase
NOT_YET_RECRUITING·NCT07241598 · Mahidol University
70 enrolled · 2025-12-01 · → 2027-12-01
As the global population ages, the prevalence of mild cognitive impairment (MCI) among older adults, which ranges from 5% to 40%, is expected to rise. MCI significantly increases the risk of developin
Mild Cognitive Impairment (MCI)
Smart±step cognitive-motor training
RECRUITING·NCT06206824 · Perha Pharmaceuticals
164 enrolled · 2024-01-18 · → 2026-06
Leucettinib-21 First-in-Human Phase 1 Study in 6 Parts: Single (Part 1 and 5) and Multiple (Part 3 and 6) Ascending Doses, and Food-Effect (Part 2) in Healthy Subjects, and Single Dose (Part 4) in Peo
Healthy Volunteers Down Syndrome Alzheimer's Disease
Leucettinib-21
UNKNOWN·NCT05663918 · McMaster University
36 enrolled · 2023-02-13 · → 2025-01-01
The research is focused on ameliorating cognitive decline in aging and in individuals diagnosed with Mild Cognitive Impairment (MCI). In the proposed research, we ask whether synaptic plasticity is mo
Mild Cognitive Impairment
Self- determined Intensity Interval Training
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 PVALB.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
💰 Estimated Development
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4.5 years
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▼ 4.1%
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Medium
0.0324
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6
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▼38.9%💾 Resource Usage
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18,988
$0.1139
Total Cost
$0.1139
🔮 Predictions
🔎 Predictions vs Observations5 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| Closed-loop transcranial alternating current stimulation (tACS) targeting EC-II at gamma frequency will enhance hippocampal gamma oscillations in AD mouse models | Significant increase in hippocampal gamma-band power (30-80 Hz) during and immediately after closed-loop tACS at gamma frequencies (40 Hz) in APP/PS1 or 3xTg AD | — no observation — | pending | 0.45 |
| Closed-loop tACS restoring gamma will improve hippocampus-dependent spatial memory in AD mouse models | Improved performance in Morris water maze (decreased escape latency, increased platform crossings) and/or novel object location recognition in AD mice receiving | — no observation — | open | 0.50 |
| PV interneurons will show greater vulnerability to Aβ oligomers than somatostatin interneurons, manifesting as specific gamma (not theta) rhythm disruption | Greater impairment of gamma oscillation power (>40% reduction) compared to theta power (<20% reduction) in brain slices or in vivo from Aβ-oligomer treated mice | — no observation — | pending | 0.55 |
| Restoration of gamma oscillations via EC-II PV interneuron targeting will reduce tau accumulation at the axon initial segment (AIS) in AD models | Reduced immunoreactivity of phosphorylated tau at AIS markers (ankyrin-G, Nav1.6) in EC-II neurons following successful gamma restoration, compared to AD mice w | — no observation — | open | 0.40 |
| Optogenetic activation of parvalbumin interneurons in amyloid-β oligomer-treated mice will selectively restore gamma oscillation power to levels comparable to untreated controls | Measurable increase in gamma-band (30-100 Hz) local field potential power in hippocampus following PV interneuron optogenetic stimulation in Aβ-oligomer injecte | — no observation — | confirmed | 0.70 |
🔮 Falsifiable Predictions (5)
confirmedconf 70%
Optogenetic activation of parvalbumin interneurons in amyloid-β oligomer-treated mice will selectively restore gamma oscillation power to levels comparable to untreated controls
Predicted outcome: Measurable increase in gamma-band (30-100 Hz) local field potential power in hippocampus following PV interneuron optogenetic stimulation in Aβ-oligom
Falsification: Gamma oscillations remain suppressed (>50% below baseline) despite PV interneuron optogenetic activation, OR non-PV interneuron activation produces equivalent gamma restoration, indicating PV specific
pendingconf 55%
PV interneurons will show greater vulnerability to Aβ oligomers than somatostatin interneurons, manifesting as specific gamma (not theta) rhythm disruption
Predicted outcome: Greater impairment of gamma oscillation power (>40% reduction) compared to theta power (<20% reduction) in brain slices or in vivo from Aβ-oligomer tr
Falsification: SST interneurons show equivalent or greater Aβ-induced dysfunction compared to PV interneurons; OR theta and gamma are equally disrupted, indicating interneuron-type specificity does not explain the o
openconf 50%
Closed-loop tACS restoring gamma will improve hippocampus-dependent spatial memory in AD mouse models
Predicted outcome: Improved performance in Morris water maze (decreased escape latency, increased platform crossings) and/or novel object location recognition in AD mice
Falsification: Cognitive performance remains impaired despite confirmed gamma enhancement; OR cognitive improvement occurs without gamma restoration (alternative mechanism), disproving gamma-to-cognition linkage
pendingconf 45%
Closed-loop transcranial alternating current stimulation (tACS) targeting EC-II at gamma frequency will enhance hippocampal gamma oscillations in AD mouse models
Predicted outcome: Significant increase in hippocampal gamma-band power (30-80 Hz) during and immediately after closed-loop tACS at gamma frequencies (40 Hz) in APP/PS1
Falsification: No measurable increase in gamma power during or after closed-loop tACS compared to sham stimulation; OR open-loop tACS produces equivalent gamma enhancement, indicating closed-loop specificity is not
openconf 40%
Restoration of gamma oscillations via EC-II PV interneuron targeting will reduce tau accumulation at the axon initial segment (AIS) in AD models
Predicted outcome: Reduced immunoreactivity of phosphorylated tau at AIS markers (ankyrin-G, Nav1.6) in EC-II neurons following successful gamma restoration, compared to
Falsification: Tau accumulation at AIS continues unchanged despite successful gamma restoration; OR tau pathology reduction occurs without gamma enhancement (indicating independent mechanism), disproving the gamma-t
📖 References (10)
- Entorhinal cortex dysfunction in Alzheimer's disease.Igarashi KM. Trends in neurosciences (2023)
- Gamma frequency entrainment attenuates amyloid load and modifies microglia.["Iaccarino H" et al.. Nature (2016)
- Neuronal Vulnerability of the Entorhinal Cortex to Tau Pathology in Alzheimer's Disease.["Zhang Simi" et al.. British journal of biomedical science (2024)
- Cell-type specific profiling of human entorhinal cortex at the onset of Alzheimer's disease neuropathology.Rodriguez-Rodriguez P et al.. bioRxiv : the preprint server for biology (2025)
- Tau Pathology Induces Excitatory Neuron Loss, Grid Cell Dysfunction, and Spatial Memory Deficits Reminiscent of Early Alzheimer's Disease.Neuron (2017)
- Gamma Entrainment Binds Higher-Order Brain Regions and Offers Neuroprotection.["Adaikkan C" et al.. Neuron (2019)
- A feasibility trial of gamma sensory flicker for patients with prodromal Alzheimer's disease.Alzheimer's & dementia (New York, N. Y.) (2024)
- The Effect of 40-Hz Light Therapy on Amyloid Load in Patients with Prodromal and Clinical Alzheimer's Disease.International journal of Alzheimer's disease (2024)
- Impact of 40 Hz Transcranial Alternating Current Stimulation on Cerebral Tau Burden in Patients with Alzheimer’s Disease: A Case SeriesM. Dhaynaut et al.. {'name': "Journal of Alzheimer's Disease", 'pages': '1667 - 1676', 'volume': '85'} (2021)
- MEG biomarker of Alzheimer's disease: Absence of a prefrontal generator during auditory sensory gating.["Josef Golubic S" et al.. Human brain mapping (2017)
▸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
0
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0
Outgoing
0
0 supporting
0 contradicting
0 neutral
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