Time-dependent changes in microglia transcriptional networks following traumatic brain injury
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE132809 | GEO | 2019/06/18
REPOSITORIES: GEO
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Project description:Traumatic brain injury (TBI) can lead to significant neuropsychiatric problemsand neurodegenerative pathologies, which develop and persist years after injury. Neuroinflammatory processes evolve over this same period. Cortical mRNA analysis showed a robust contribution of microglia to neuroinflammatory pathways that persisted over time post-injury. These data also indicate that inflammation persists in the subacute and chronic time points after TBI, which may affect surrounding neurons, oligodendrocytes and astrocytes. To investigate this hypothesis, a single-cell sequencing approach was used to determine cell-type specific gene expression within the cortex 7 dpi with and without microglial depletion.
2020-11-15 | GSE160763 | GEO
Project description:Traumatic brain injury (TBI) can lead to significant neuropsychiatric problems and neurodegenerative pathologies, which develop and persist years after injury. Neuroinflammatory processes evolve over this same period. Therefore, we aimed to determine the contribution of microglia to neuropathology at acute (1-day post-injury; dpi), subacute (7 dpi), and chronic (30 dpi) time-points. Microglia were depleted with PLX5622, a CSF1R antagonist, prior to midline fluid percussion injury in male mice and cortical neuropathology/inflammation was assessed using a neuropathology mRNA panel. NanoString Neuropathology gene expression panel was used to quantify expression from RNA microdissected from the mouse cortex.
2020-11-15 | GSE160651 | GEO
Project description:We assessed the roles of repopulating microglia in brain repair using mouse models. In this project, we show that removal of microglia from the mouse brain has little impact on the outcome of TBI but inducing the turnover of these cells through either pharmacologic or genetic approaches can yield a neuroprotective microglial phenotype that profoundly aids recovery. As a part of the experimental approaches, we perform bulk RNA sequencing experiments to unbiasedly profile the transcriptome of repopulating microglia. We identified unique gene signatures from repopulating microglia cells and infer how these cells modulate the microenvironment after TBI.
2020-02-15 | E-MTAB-8765 | biostudies-arrayexpress
Project description:Traumatic brain injury (TBI) is an under-recognizedpublic healththreat. Even mild brain injuries can lead to long-term neurologic impairment.Microgliaplay a fundamental role in the development and progression of this ensuing neurologic impairment. Despite this, a microglia-specific injury signature has yet to be identified. We hypothesized that TBI would lead to long-term changes in the transcriptional profile of microglial pathways associated with the development of subsequent neurologic impairment.
2023-12-11 | GSE249918 | GEO
Project description:The neuroinflammatory response to traumatic brain injury (TBI) is critical to both neurotoxicity and neuroprotection, and has been proposed as a potentially modifiable driver of secondary injury in animal and human studies. Attempts to broadly target immune activation have been unsuccessful in improving outcomes, in part because the precise cellular and molecular mechanisms driving injury and outcome at acute, subacute, and chronic time points after TBI remain poorly defined. Microglia play a critical role in neuroinflammation and their persistent activation may contribute to long-term functional deficits. Activated microglia are characterized by morphological transformation and transcriptomic changes associated with specific inflammatory states. We analyzed the temporal course of changes in inflammatory genes of microglia isolated from injured brains at 2, 14, and 60 days after controlled cortical impact (CCI) in mice, a well-established model of focal cerebral contusion. We identified a time dependent, injury-associated change in the microglial gene expression profile toward a reduced ability to sense tissue damage, perform housekeeping, and maintain homeostasis in the early stages following CCI, with recovery and transition to a specialized inflammatory state over time. This later state starts at 14 days post-injury and is characterized by a biphasic pattern of IFNγ, IL-4, and IL-10 gene expression changes, with concurrent proinflammatory and anti-inflammatory gene changes. Our transcriptomic data sets are an important step to understand microglial role in TBI pathogenesis at the molecular level and identify common pathways that affect outcome. More studies to evaluate gene expression at the single cell level and focusing on subacute and chronic timepoint are warranted.
| S-EPMC6694299 | biostudies-literature
Project description:Background: Severe Traumatic Brain Injury (TBI) has become a growing health problem, causing a vast society burden worldwide. However, characteristic mechanisms between acute and subacute stages have not been systemically revealed. Methods: Sixty rats were randomly divided into sham surgery and model groups. Severe TBI model was induced by controlled cortical impact (CCI). Neurological deficits were evaluated by modified neurological severity score (mNSS). H&E staining and immunofluorescence were performed to assess the injured brain tissues. The protein expressions of hippocampus were analyzed by the tandem mass tag-based (TMT) quantitative proteomics on the third and fourteenth days. The shared and stage-specific differentially expressed proteins (DEPs) were screened, and then analyzed by the gene ontology (GO), Kyoto encyclopedia of genes and genomes (KEGG) and protein-protein interaction (PPI). Eventually, target proteins were further verified by Western blotting (WB). Results: The neurological deficits always exist from the acute stage to the subacute stage of severe TBI and showed a downward trend. The brain parenchyma of TBI models was dramatically impaired. A total of 375 and 139 DEPs were identified at day 3 and 14, respectively. Sixty-three DEPs were co-existed between the two stages. Both stages were mainly related to the complement and coagulation cascades pathway. Three pathways associated with gastric acid secretion, insulin secretion and thyroid hormone synthesis were only enriched in the acute phase. Comparatively, amyotrophic lateral sclerosis (ALS) was significantly enriched in the subacute stage. WB confirmed the reliability of the TMT quantitative proteomics results. Conclusion: Our findings highlight the same and different pathological processes in the acute and subacute phases of severe TBI and provide potential protein biomarkers.
2023-06-07 | PXD029312 | Pride
Project description:Differential microglial inflammatory responses play a role in regulation of differentiation and maturation of oligodendrocytes (OLs) in brain white matter. How microglia-OL crosstalk is altered by traumatic brain injury (TBI) and its impact on axonal myelination and neurological function impairment remain poorly understood. In this study, we investigated roles of a Na+/H+ exchanger (NHE1), an essential microglial pH regulatory protein, in microglial proinflammatory activation and OL survival and differentiation in a murine TBI model induced by controlled cortical impact. Similar TBI-induced contusion volumes were detected in the Cx3cr1-CreERT2 control (Ctrl) mice and selective microglial Nhe1 knockout (Cx3cr1-CreERT2;Nhe1flox/flox, Nhe1 cKO) mice. Compared to the Ctrl mice, the Nhe1 cKO mice displayed increased resistance to initial TBI-induced white matter damage. The cKO brains presented increased anti-inflammatory phenotypes of microglia and infiltrated myeloid cells, with reduced proinflammatory transcriptome profiles. Moreover, the cKO mice exhibited accelerated post-TBI sensorimotor and cognitive functional recovery than the Ctrl mice. These phenotypic outcomes were recapitulated in C57BL6J wild-type mice which were subjected to TBI and received treatment of a potent NHE1 inhibitor HOE642 for 1-7 days post-TBI. Taken together, these findings collectively demonstrated that blocking NHE1 protein stimulates restorative microglial activation and oligodendrogenesis, which contributes to accelerated white matter repair and neurological function recovery after TBI.
2022-04-03 | GSE199869 | GEO
Project description:In this study, we performed bulk RNA sequencing of concurrently isolated microglia and astrocytes to evaluate their cell-specific transcriptional responses to TBI 7 days post-injury. Our findings revealed sustained, cell-specific transcriptional changes in both microglia and astrocytes, with microglia showing a greater transcriptional response than astrocytes at this subacute timepoint. The microglia and astrocyte transcriptional response to TBI was unique from other neurodegenerative and neuroinflammatory diseases that have been described. In addition, microglia and astrocytes showed overlapping enrichment for genes related to type I interferon signaling and MHC class I antigen presentation.
2021-06-01 | GSE167459 | GEO
Project description:To determine if there is an APOE isoform-specific response to TBI we performed controlled cortical impact on 3-month-old mice expressing human APOE3 or APOE4 isoforms. Following injury, we used several behavior paradigms to test for anxiety and learning and found that APOE3 and APOE4 targeted replacement mice demonstrate cognitive impairments following moderate TBI. Transcriptional profiling 14 days following injury revealed a significant effect of TBI, which was similar in both genotypes.
2017-07-29 | GSE102014 | GEO
Project description:Traumatic brain injury (TBI) causes acute and lasting impacts on the brain, driving pathology along anatomical, cellular, and behavioral dimensions. Rodent models offer the opportunity to study TBI in a controlled setting, and enable analysis of the temporal progression that occurs from injury to recovery. We applied transcriptomic and epigenomic analysis, characterize gene expression and in ipsilateral hippocampus at 1 and 14 days following moderate lateral fluid percussion (LFP) injury. This approach enabled us to identify differential gene expression (DEG) modules with distinct expression trajectories across the two time points. The major DEG modules represented genes that were up- or downregulated acutely, but largely recovered by 14 days. As expected, DEG modules with acute upregulation were associated with cell death and astrocytosis. Interestingly, acutely downregulated DEGs related to neurotransmission mostly recovered by two weeks. Upregulated DEG modules related to inflammation were not necessarily elevated acutely, but were strongly upregulated after two weeks. We identified a smaller DEG module with delayed downregulation at 14 days including genes related to cholesterol metabolism and amyloid beta clearance. Finally, differential expression was paralleled by changes in H3K4me3 at the promoters of differentially expressed genes at one day following TBI. Following TBI, changes in cell viability, function and ultimately behavior are dynamic processes. Our results show how transcriptomics in the preclinical setting has the potential to identify biomarkers for injury severity and/or recovery, to identify potential therapeutic targets, and, in the future, to evaluate efficacy of an intervention beyond measures of cell death or spatial learning.
2021-10-31 | GSE173975 | GEO