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Regulation of neuronal gene and miRNA expression by the complement protein C1q associated with neuroprotection

ABSTRACT: Identification of transcriptional profiles stimulated by the complement protein C1q in rat immature neurons associated with the C1q-dependent neuroprotection observed in vitro. Use of the unbiased whole genome microarray approach to identify genes regulated by C1q.

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE18860 | GEO | 2011/03/07

SECONDARY ACCESSION(S): PRJNA121107

REPOSITORIES: GEO

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Regulation of neuronal gene and miRNA expression by the complement protein C1q associated with neuroprotection

Project description:Identification of transcriptional profiles stimulated by the complement protein C1q in rat immature neurons associated with the C1q-dependent neuroprotection observed in vitro. Use of the unbiased whole genome microarray approach to identify genes regulated by C1q. Immature neurons grown in vitro for 3 days were stimulated with 10 nM C1q for 3h.

2011-03-07 | E-GEOD-18860 | biostudies-arrayexpress

Modulation of gene expression by complement protein C1q in amyloid-beta injured neurons

Project description:Complement protein C1q is induced after injury in the brain and during Alzheimer's disease and has been shown to protect against amyloid-beta induced neuronal death. In this study, we used microarray approach to identify the pathways modulated by C1q that are associated with neuroprotection. Immature rat cortical primary neurons are treated with fibrillar amyloid-beta peptides and/or C1q for 3h before RNA extraction and hybridization on rat Affymetrix microarrays. Supplementary file: Processed/normalized, probe-level signal intensities from neurons treated with amyloid-beta or C1q. Median signal intensity used as global normalization method, done with JMP genomics (v5.0) software.

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Modulation of gene expression by complement protein C1q in amyloid-beta injured neurons

2012-12-21 | GSE28886 | GEO

Complement C1q-dependent synapse elimination by astrocytes in a mouse model of Alzheimer's disease

Project description:Synapse loss and glial activation are hallmarks of Alzheimer's disease (AD). In Tau P301S transgenic mice, the complement pathway contributes to neuronal damage through microglial elimination of synapses. Here, we used unbiased proteomic profiling of postsynaptic density (PSD) fractions from Tau P301S mice in C1q-WT versus C1q knockout backgrounds to identify C1q-dependent changes at synapses. Integrative multi-omics analysis revealed that astrocyte- and microglia- specific proteins are increased in Tau P301S synapse fractions with age and in a C1q-dependent manner. The same set of glial proteins (including C1q, C4, Gpnmb, and S100a4) is elevated in human AD synaptic fractions, and C4 levels are raised in cerebrospinal fluid (CSF) from AD patients. Besides microglia, we show that astrocytes contribute substantially to excitatory and inhibitory synapse engulfment in Tau P301S hippocampus. Based on staining of synapse markers within lysosomes, astrocytes showed preference for excitatory synapses whereas microglia preferred to engulf inhibitory synapse markers. Genetic deletion of C1q reduced astrocytic eating of excitatory and inhibitory synapses in Tau P301S mice, and rescued synapse density. Together, our data indicate that astrocytes contact and phagocytose synapses in a C1q- dependent manner and thereby contribute to synapse loss and neurodegeneration in AD.

2021-11-03 | MSV000088313 | MassIVE

Transcriptome analysis of C1q-administrated murine lungs

Project description:Pulmonary fibrosis (PF) is a progressive fibrotic disease with a poor prognosis and suboptimal therapeutic options. The complement molecule C1q, which plays an important role in the phagocytic capacity of macrophages, has recently been reported to exacerbate several fibrosis-related diseases. On the other hand, there are still no reports in PF. Here, we analyzed gene expression changes of C1q-administrated murine lungs.

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Transcriptome analysis of C1q treated lung fibroblasts

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Complement protein C1q-mediated neuroprotection is correlated with regulation of neuronal gene and microRNA expression.

Project description: Not available

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Complement factor C1q mediates sleep spindle disruption and epileptic spikes after mild brain injury

Project description:While traumatic brain injury (TBI) acutely disrupts the cortex, most TBI-related disabilities reflect secondary injuries that accrue over time. The thalamus is a likely site of secondary damage because of its reciprocal connections with the cortex. Using a mouse model of mild cortical injury that does not directly damage subcortical structures (mTBI), we found a chronic increase in C1q expression specifically in the corticothalamic circuit. Increased C1q expression co-localized with neuron loss and chronic inflammation, and correlated with disruption in sleep spindles and emergence of epileptic activities. Blocking C1q counteracted these outcomes, suggesting that C1q is a disease modifier in mTBI. Single-nucleus RNA sequencing demonstrated that microglia are the source of thalamic C1q. Since the corticothalamic circuit is important for cognition and sleep, which can be impaired by TBI, this circuit could thus be a new target for treating TBI-related disabilities.

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Time-series single-cell RNA sequencing analysis of C1q-administrated murine lungs

Project description:Pulmonary fibrosis (PF) is a progressive fibrotic disease with a poor prognosis and suboptimal therapeutic options. The complement molecule C1q, which plays an important role in the phagocytic capacity of macrophages, has recently been reported to exacerbate several fibrosis-related diseases. On the other hand, there are still no reports in PF. Here, we analyzed detailed gene expression changes of each cell population in C1q-administrated murine lungs.

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Complement protein C1q modulates macrophage molecular signaling and inflammatory responses during ingestion of atherogenic lipoproteins

Project description:C1q suppresses JAK-STAT signal transduction and activates PPAR-mediated transcription in macrophages during clearance of modified forms of LDL leading to a reduction in inflammatory response. Human monocyte-derived macrophages (HMDM) were incubated with either oxidized (oxLDL) or acetylated low-density lipoprotein (acLDL) in the presence or absence of C1q for 3 hours. Total RNA was extracted using the Qiagen RNeasy Mini Kit. RNA libraries were constructed using the Illumina TruSeq Stranded mRNA Sample Preparation Kit. Sequences were aligned to a reference genome (hg38), RPKM and raw counts were determined using CASAVA version 1.8.2.

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