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CLU alleviates Alzheimer’s disease-relevant processes by modulating astrocyte reactivity and microglia-dependent synaptic density [scRNA-seq]

ABSTRACT: CLU alleviates Alzheimer’s disease-relevant processes by modulating astrocyte reactivity and microglia-dependent synaptic density [scRNA-seq]

PROVIDER: PRJNA1223439 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR32338065_1.fastq.gz	Fastqsanger.gz
	SRR32338065_2.fastq.gz	Fastqsanger.gz
	SRR32338066_1.fastq.gz	Fastqsanger.gz
	SRR32338066_2.fastq.gz	Fastqsanger.gz

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CLU alleviates Alzheimer’s disease-relevant processes by modulating astrocyte reactivity and microglia-dependent synaptic density [RNA-Seq]

Project description:Genetic studies implicate Clusterin (CLU) in the pathogenesis of Alzheimer’s disease (AD), yet its precise molecular impact remains unclear. Through unbiased proteomic profiling and functional validation in CLU-deficient astrocytes, we identify increased NfkB-dependent signaling and complement C3 secretion. Reduction of astrocyte CLU induced microglia dependent modulation of extracellular APOE and phosphorylated tau, as well as increased microglial phagocytosis and reduced synapse numbers. By integrating mouse and human cellular models with comprehensive analyses of human plasma and brain tissue, we demonstrate that CLU AD risk alleles are associated with reduced CLU protein and heightened inflammatory profiles. These findings establish a mechanistic link between AD genetic risk factors, astrocyte reactivity, and microglia-mediated effects on synaptic integrity. Collectively, these results support a model in which CLU upregulation in response to neuropathology is associated with maintenance of cognitive function, while diminished astrocyte CLU levels heighten disease susceptibility.

2025-04-28 | GSE294133 | GEO

CLU alleviates Alzheimer’s disease-relevant processes by modulating astrocyte reactivity and microglia-dependent synaptic density [scRNA-seq]

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CLU alleviates Alzheimer’s disease-relevant processes by modulating astrocyte reactivity and microglia-dependent synaptic density [RNA-Seq]

Project description:CLU alleviates Alzheimer’s disease-relevant processes by modulating astrocyte reactivity and microglia-dependent synaptic density [RNA-Seq]

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Alzheimer’s Disease Protective Allele of CLU Promotes Neuron Excitability, Neuron-glia Lipid Transfer and Astrocytic Lipid Droplets via neuronal CLU

Project description:Disease causal mechanism remains largely unknown for most Alzheimer’s disease (AD) genome-wide association studies (GWAS) risk loci, including the Clusterin (CLU) locus. Here, leveraging our approach to identify functional GWAS risk variants that show allele-specific open chromatin (ASoC), we nominated a putative AD causal SNP rs1532278 (T/C) of CLU that showed strong ASoC specifically in iPSC-derived excitatory neurons (iGlut). We found the AD protective allele T of rs1532278 elevated neuronal CLU and promoted neuron excitability. Transcriptomic analysis of iGlut (T/T vs. C/C) co-cultured with mouse astrocytes surprisingly showed allele T upregulated lipid synthesis and astrocytic lipid metabolism pathways. Further corroborative functional studies mechanistically tied allele T to CLU-facilitated neuron-glia lipid transfer and astrocytic lipid droplet (LD) formation. Interestingly, astrocytes with more LD were found to uptake less glutamate likely due to reactive oxygen species (ROS), which may contribute to CLU-promoted neuron excitability. Our study uncovered a previously unappreciated protective role of neuronal CLU in maintaining proper neuronal excitability through lipid-mediated neuron-glia communication.

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A Molecular Switch for Neuroprotective Astrocyte Reactivity

Project description:A Molecular Switch for Neuroprotective Astrocyte Reactivity

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A Molecular Switch for Neuroprotective Astrocyte Reactivity

Project description:A Molecular Switch for Neuroprotective Astrocyte Reactivity

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Divergent transcriptional regulation of astrocyte reactivity across disorders [TR_ATAC_SCI]

Project description:Single-nuclei Assay for Transposase-Accessible Chromatin with sequencing (snATACseq) was applied to examine chromatin landscape changes and transcriptional regulator (TR) DNA motif accessibility in reactive astrocytes following traumatic spinal cord injury (SCI). Astrocyte nuclei were isolated from the spinal cord of wild type mice and mice with astrocyte-specific conditional gene deletion (cKO) of test-case TRs, SMARCA4 (Smarca4-astro-cKO) or STAT3 knockout (Stat3-astro-cKO). Comparison of differential chromatin accessibility revealed substantial remodeling during astrocyte reactivity, with more chromatin opening than closing. Marked alterations in access to SCI reactivity-associated TR motifs were also detected.

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Divergent transcriptional regulation of astrocyte reactivity across disorders [TR_ATAC_LPS]

Project description:Single-nuclei Assay for Transposase-Accessible Chromatin with sequencing (snATACseq) was applied to examine chromatin landscape changes and transcriptional regulator (TR) DNA motif accessibility in reactive astrocytes following neuroinflammatory insult by systemic administration of lipopolysaccharide (LPS). Astrocyte nuclei were isolated from the spinal cord of wild type mice and mice with astrocyte-specific conditional gene deletion (cKO) of test-case TRs, SMARCA4 (Smarca4-astro-cKO) or STAT3 knockout (Stat3-astro-cKO). Comparison of differential chromatin accessibility revealed substantial remodeling during astrocyte reactivity, with more chromatin opening than closing. Marked alterations in access to LPS reactivity-associated TR motifs were also detected.

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A phenotypic screening platform for identifying chemical modulators of astrocyte reactivity

Project description:This SuperSeries is composed of the SubSeries listed below. Disease, injury, and aging induce pathological reactive astrocyte states that contribute to neurodegeneration. Modulating reactive astrocytes therefore represents an attractive therapeutic strategy. Here, we describe the development of an astrocyte phenotypic screening platform for identifying chemical modulators of astrocyte reactivity. Leveraging this platform for chemical screening, we identify HDAC3 inhibitors as effective suppressors of pathological astrocyte reactivity. We demonstrate that HDAC3 inhibition reduces molecular and functional characteristics of reactive astrocytes in vitro. Transcriptional and chromatin mapping studies show that HDAC3 inhibition disarms pathological astrocyte gene expression and function while promoting the expression of genes associated with beneficial astrocytes. Administration of RGFP966, a small molecule HDAC3 inhibitor, blocks reactive astrocyte formation and promotes neuroprotection in vivo in mice. Collectively, these results establish a platform for discovering modulators of reactive astrocyte states, inform the mechanisms that control astrocyte reactivity, and demonstrate the therapeutic benefits of modulating astrocyte reactivity for neurodegenerative diseases.

2024-01-10 | GSE185215 | GEO

Divergent transcriptional regulation of astrocyte reactivity across disorders [RNA-seq]

Project description:RNA sequencing was applied to examine changes in gene expression in reactive astrocytes following traumatic spinal cord injury (SCI) or neuroinflammatory insult by systemic administration of lipopolysaccharide (LPS). Transgenic Ribotag technology was used to isolate astrocyte ribosome-associated mRNAs from the spinal cord of wild type mice and mice with astrocyte-specific conditional gene deletion (cKO) of test-case transcriptional regulators of reactivity, SMARCA4 (Smarca4-astro-cKO) or STAT3 knockout (Stat3-astro-cKO). Examination of differentially expressed gene (DEG) profiles by upstream transcriptional regulator enrichment analysis (TREA) was used identify transcriptional regulators of reactivity in each condition. Together, findings from this study show that transcriptional changes associated with astrocyte reactivity are exquisitely heterogeneous and are customized from vast numbers of potential DEGs via context-specific combinatorial TR interactions. These data have also been made accessible in a open-access, searchable database: http://tr.astrocytereactivity.com

2022-05-26 | GSE199149 | GEO

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