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0N4R Tau and 0N4R Tau P301L Neuronal Interactomes

ABSTRACT: Human non-mutated 0N4R Tau and P301L mutant 0N4R Tau tagged at the N-terminus with eGFP were expressed in mouse (CD1) primary cortical neurons using adeno associated viruses to monitor early changes in the synaptic interactome beforethe onset of neuronal loss. Affinity purification mass spectrometry (AP-MS) combined with tandem mass tagging was used to quantitatively compate the non-mutated and P301L interactomes.

INSTRUMENT(S): Orbitrap Fusion

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Primary Neuron, Cell Culture

DISEASE(S): Frontotemporal Dementia

SUBMITTER: Robert Williams

LAB HEAD: Robert Justin Williams

PROVIDER: PXD044959 | Pride | 2024-07-03

REPOSITORIES: Pride

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Publications

TauP301L disengages from the proteosome core complex and neurogranin coincident with enhanced neuronal network excitability.

Hole Katriona L KL Zhu Bangfu B Huggon Laura L Brown Jon T JT Mason Jody M JM Williams Robert J RJ

Cell death & disease 20240618 6

Tauopathies are characterised by the pathological accumulation of misfolded tau. The emerging view is that toxic tau species drive synaptic dysfunction and potentially tau propagation before measurable neurodegeneration is evident, but the underlying molecular events are not well defined. Human non-mutated 0N4R tau (tauWT) and P301L mutant 0N4R tau (tauP301L) were expressed in mouse primary cortical neurons using adeno-associated viruses to monitor early molecular changes a ...[more]

PMID: 38890273

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Are Mouse Models a surrogate for human disease? A temporal, quantitative and molecular perspective.

Project description:It is unclear to what extent Tau molecular pathology in murine models reflect human Tauopathies. Nevertheless, mouse models that overexpress human mutant Tau (P301S and P301L) are widely used in studies of Tauopathies and Alzheimer’s Disease (AD). In this study, we perform an in-depth temporally and spatially resolved mass spectrometry-based proteomic analysis of P301S (hTau.P301S) and P301L (rTg(tauP301L)4510) mice as well as human patients with AD or frontotemporal dementia due to the P301L mutation, to identify differences and similarities between human AD, animal models and human P301L patients. Both mouse models and human P301L patients show progressive Tau accumulation driven by Tau phosphorylation during disease progression as also observed in early human AD. However, Tau ubiquitination and acetylation, important in human AD, are less or not represented in the mouse models or in P301L patients. Our analyses provide guidance regarding designing mechanistic studies and testing of Tau directed therapeutics.

2023-02-03 | PXD033965 | Pride

Gene expression profile at single cell levels of the cells from the controls and tau P251L Drosophila brain.

Project description:Tau protein has been implicated in the pathology of Alzheimer's disease and related disorders. We CRISPR engineered an endogenous model of tauopathy by knocking in a pathogenic human tau mutation, tau P301L, in Drosophila, tau P251L KI. We used single cell RNA sequencing to identify the differentially expressed genes or pathways.

2024-02-26 | GSE223345 | GEO

TBK1 interacts with tau and enhances neurodegeneration in tauopathy

Project description:One of the defining pathological features of Alzheimer’s Disease (AD) is the deposition of neurofibrillary tangles (NFTs) composed of hyperphosphorylated tau in the brain. Aberrant activation of kinases in AD has been suggested to enhance phosphorylation and toxicity of tau, making the responsible tau kinases attractive therapeutic targets. The full complement of tau interacting kinases in AD brain and their activity in disease remains incompletely defined. Here, immunoaffinity enrichment coupled with mass spectrometry (MS) identified TANK-binding kinase 1 (TBK1) as a tau-interacting partner in human AD cortical brain tissues. We validated this interaction in human AD, familial frontotemporal dementia and parkinsonism linked to chromosome 17 (FTDP-17) caused by mutations in MAPT (R406W & P301L) and corticobasal degeneration (CBD) postmortem brain tissues as well as human cell lines. Further, we document increased TBK1 activation in both AD and FTDP-17 and map TBK1 phosphorylation sites on tau based on in vitro kinase assays coupled to MS. Lastly, in a Drosophila tauopathy model, activating expression of a conserved TBK1 ortholog triggers tau hyperphosphorylation and enhanced neurodegeneration, whereas knockdown had the reciprocal effect, suppressing tau toxicity. Collectively, our findings suggest that increased TBK1 activation may promote tau hyperphosphorylation and neuronal loss in AD and related tauopathies.

2022-03-01 | PXD025301 | Pride

Tau aggregates are RNA-protein assemblies that mis-localize multiple nuclear speckle components

Project description:We report the isolation and sequencing of tau aggregates from [1] HEK293 cells expressing Tau-RD-P301S-CFP/YFP that have been seeded with preformed fibrils from the brain of P301S mice (B6-Tg(Thy1-MAPT*P301S)2541; referred to as Tg2541 mice). Tau aggregates were isolated by differential centrifugation followed by fluorescence automated particle sorting using a BD FACSaraia. We found that these tau aggregates were enriched for particular small non-coding RNAs, including snoRNAs and snRNAs. [2] the following mice: FvBB6F1-Tg(Camk2a-tTa),(tetO-MAPT*wt)21221 (referred to as rTg21221 or WT tau mice in the paper) and FvBB6F1-Tg(Camk2a-tTA)1Mmay, (tet)-tdTomato-Syp/EGFP)1.1Luo/J,(tetO-MAPT*P301L)4510 (referred to as rTg4510 or P301L mice in the paper). Briefly, tau aggregates were isolated by 1% sarkosyl extraction (to enrich for insoluble proteins) followed by immunoprecipitation of tau using the tau-12 antibody (see Methods section of associated paper for further details). We found that these tau aggregates were enriched for particular small non-coding RNAs, including snRNAs and some snoRNAs. [3] Sequencing of HEK293 tau biosensor cells with and without tau aggregates reveals evidence of significant splicing alterations. Specifically we observed an increase in intron retention events in cells that contain tau aggregates relative to cells without tau aggregates.

2021-04-06 | GSE148716 | GEO

Skeletal muscle gene expression from P301L tau expressing mice using NanoString

Project description:We analyzed gene expression in regions from tibialis anterior cross sections of P301L tau expressing mice and controls. The regions were: standard myofibers, regions containing centrally nucleated myofibers, myofibers proximal to nerve bundle, and myofibers proximal to vasculature

2023-11-19 | GSE248201 | GEO

MAPK-DLK signaling coupled with DNA damage promotes intrinsic neurotoxicity associated with non-mutated tau

Project description:Alzheimer’s disease (AD) is the most prevalent form of neurodegeneration. Despite the well-established link between tau aggregation and clinical progression, the major pathways driven by this protein to intrinsically damage neurons are incompletely understood. To model AD-relevant neurodegeneration driven by tau, we overexpressed non-mutated human tau in primary mouse neurons and observed substantial axonal degeneration and cell death, a process accompanied by activated caspase 3. Mechanistically, we detected deformation of the nuclear envelope and increased DNA damage response in tau-expressing neurons. Gene profiling analysis further revealed significant alterations in the mitogen-activated protein kinase (MAPK) pathway; moreover, inhibitors of dual leucine zipper kinase (DLK) and c-Jun N-terminal kinase (JNK) were effective in alleviating wild-type human tau-induced neurodegeneration. In contrast, mutant P301L human tau was less toxic to neurons, despite causing comparable DNA damage. Axonal DLK activation induced by wild-type tau potentiated the impact of DNA damage response, resulting in overt neurotoxicity. In summary, we have established a cellular tauopathy model highly relevant to AD and identified a functional synergy between the MAPK-DLK axis and DNA damage response in the neuronal degenerative process.

2023-11-15 | GSE246259 | GEO

Neuronal interactome changes upon aggregation of Tau

Project description:To understand at molecular level how aggregation of Tau modulates its interactions with proteins we reveal key determinant for derailing Tau protein network. By performing quantitative AP-MS we define a new set of interactors which bind Tau upon fibril formation. These interactors contain disordered regions with a unique amino acidic footprint. Such regions are enriched in positively charged Arginines which can engage aberrant binding to Tau fibrils through their guanidinium group via pi-stacking. We also find that the Hsp90 chaperone stalls formation of Tau fibrils and reshapes their abnormal interactome.

2020-01-30 | PXD015432 | Pride

Truncated Tau - Role of the Tau N-terminal region in microtubule stabilization revealed by new endogenous truncated forms

Project description:Tau is a microtubule-associated protein that ensures neuronal shape and function. Besides, Tau is a central player in Alzheimer’s disease (AD) and related Tauopathies where it is found aggregated in degenerating neurons. Mechanisms leading to Tau pathology and its progression are far from being elucidated. Among Tau species found in AD brains, several yet unidentified truncated Tau fragments are showed. A major step forward in the understanding of the role of Tau truncation would be to identify the precise cleavage sites of Tau species. This key step is mandatory to generate appropriate experimental tools in order to investigate the impact of each identified truncated-species on Tau function/dysfunction. Here, we achieved an optimized proteomics approach and succeed in identifying a number of new N-terminally truncated-Tau species from human brain. As N-terminal residues of these fragments are located broadly across Tau sequence, one could expect to have different effects on Tau. We initiated cell-based functional studies by analyzing biochemical characteristics of two N-terminally truncated Tau species starting at residues Met11 and Gln124 (accordingly to the longest Tau isoform) regarding Tau microtubule function. Our results surprisingly showed that the ability of Tau to bind and stabilize microtubules was greater when the first 123 residues are truncated, suggesting that Tau N-terminus would have a role in regulation of microtubule stabilization. Overall, future studies based on our new N-terminally truncated-Tau species will provide new knowledge on the role of truncation in Tau biology as well as in AD pathological process.

2015-05-15 | PXD001353 | Pride

Typical western diet exacerbates dystrophic neurite pathology in APP/PS1 and APP/PS1/Tau mouse models by reducing the clustering of microglia around β-amyloid plaques

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