Sex Differences in the Neuronal Transcriptome and Synaptic Mitochondrial Function in Cerebral Cortex of a Multiple Sclerosis Model
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE239455 | GEO | 2023/11/13
REPOSITORIES: GEO
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Project description:Changes in gene expression that occur across the entire central nervous system (CNS) during disease do not take into account variability from one CNS region to another and can be confounded by alterations in cellular composition during disease. Multiple sclerosis (MS) is characterized by cell proliferation, migration and damage in various cell types in different CNS regions and causes disabilities related to distinct neurological pathways, such as walking, vision and cognition. Here, a cell-specific and region-specific transcriptomic approach was used to determine changes in gene expression in astrocytes derived from spinal cord, cerebellum, cerebral cortex, and hippocampus in the preclinical MS model, chronic experimental autoimmune encephalomyelitis (EAE). RNA sequencing and bioinformatics analysis showed that changes in gene expression pathways in astrocytes differed between neuroanatomic regions. Further, while astrocytes from spinal cord showed increased expression of immune pathway genes during EAE, cholesterol biosynthesis pathway genes were decreased. Translating these findings from the preclinical model to humans, optic nerve from EAE and optic chiasm from MS each showed a significant decrease in cholesterol biosynthesis pathways. Finally, a treatment targeting cholesterol homeostasis in astrocytes was protective in EAE, suggesting a novel neuroprotective strategy for MS. Using a cell-specific and region-specific gene expression approach can provide therapeutically relevant insights into mechanisms underlying specific disabilities in complex multifocal neurological diseases.
2017-12-23 | GSE100297 | GEO
Project description:Changes in gene expression that occur across the entire central nervous system (CNS) during disease do not take into account variability from one CNS region to another and can be confounded by alterations in cellular composition during disease. Multiple sclerosis (MS) is characterized by cell proliferation, migration and damage in various cell types in different CNS regions and causes disabilities related to distinct neurological pathways, such as walking, vision and cognition. Here, a cell-specific and region-specific transcriptomic approach was used to determine changes in gene expression in astrocytes derived from spinal cord, cerebellum, cerebral cortex, and hippocampus in the preclinical MS model, chronic experimental autoimmune encephalomyelitis (EAE). RNA sequencing and bioinformatics analysis showed that changes in gene expression pathways in astrocytes differed between neuroanatomic regions. Further, while astrocytes from spinal cord showed increased expression of immune pathway genes during EAE, cholesterol biosynthesis pathway genes were decreased. Translating these findings from the preclinical model to humans, optic nerve from EAE and optic chiasm from MS each showed a significant decrease in cholesterol biosynthesis pathways. Finally, a treatment targeting cholesterol homeostasis in astrocytes was protective in EAE, suggesting a novel neuroprotective strategy for MS. Using a cell-specific and region-specific gene expression approach can provide therapeutically relevant insights into mechanisms underlying specific disabilities in complex multifocal neurological diseases.
2017-12-23 | GSE100329 | GEO
Project description:Changes in gene expression that occur across the entire central nervous system (CNS) during disease do not take into account variability from one CNS region to another and can be confounded by alterations in cellular composition during disease. Multiple sclerosis (MS) is characterized by cell proliferation, migration and damage in various cell types in different CNS regions and causes disabilities related to distinct neurological pathways, such as walking, vision and cognition. Here, a cell-specific and region-specific transcriptomic approach was used to determine changes in gene expression in astrocytes derived from spinal cord, cerebellum, cerebral cortex, and hippocampus in the preclinical MS model, chronic experimental autoimmune encephalomyelitis (EAE). RNA sequencing and bioinformatics analysis showed that changes in gene expression pathways in astrocytes differed between neuroanatomic regions. Further, while astrocytes from spinal cord showed increased expression of immune pathway genes during EAE, cholesterol biosynthesis pathway genes were decreased. Translating these findings from the preclinical model to humans, optic nerve from EAE and optic chiasm from MS each showed a significant decrease in cholesterol biosynthesis pathways. Finally, a treatment targeting cholesterol homeostasis in astrocytes was protective in EAE, suggesting a novel neuroprotective strategy for MS. Using a cell-specific and region-specific gene expression approach can provide therapeutically relevant insights into mechanisms underlying specific disabilities in complex multifocal neurological diseases.
2017-12-23 | GSE100294 | GEO
Project description:Objective: We previously reported that white matter connexin43 (Cx43) may related to the severity of the multiple sclerosis (MS), whereas the role of gray matter Cx43 in demyelinating disease is unknown. It was considered MS lesions were only exist in white matter, but recent studies revealed that demyelinating lesions are also exist in the cerebral cortex. This fact suggest the possibility that gray matter is somewhat related to the pathophysiology of MS. In this study, we aimed to clarify the role of gray matter Cx43 in a mouse model of MS (experimental autoimmune encephalomyelitis [EAE]). Methods: We developed Cx43F/F;Glutamate aspartate transporter (GLAST)-CreER(T2)KI/+ mice as gray matter specific Cx43 conditional knock-out (Cx43cKO) mice. We induced MOG-EAE 10 days after tamoxifen injection, and analyze its clinical course and pathology. We used Cx43F/F mice as controls. Results: EAE was significantly milder in gray matter astrocyte-specific Cx43cKO mice from acute phase to chronic phase, as compared with control mice. Pathology demonstrated less demyelinating lesions and infiltrating cells. Infiltrating immune cells did not express Cx43 in the active demyelinating lesions of the lumbar cord in both groups. The expression level of Cx43 was similar between these two groups in the spleen and the inguinal lymph nodes. Interpretation: Acute KO of gray matter specific Cx43 before induction of EAE reduce its aggressiveness. This finding may suggest the possibility that gray matter Cx43 modify the MS pathophysiology.
2021-04-20 | GSE148931 | GEO
Project description:Objective: We previously reported that white matter connexin43 (Cx43) may related to the severity of the multiple sclerosis (MS), whereas the role of gray matter Cx43 in demyelinating disease is unknown. It was considered MS lesions were only exist in white matter, but recent studies revealed that demyelinating lesions are also exist in the cerebral cortex. This fact suggest the possibility that gray matter is somewhat related to the pathophysiology of MS. In this study, we aimed to clarify the role of gray matter Cx43 in a mouse model of MS (experimental autoimmune encephalomyelitis [EAE]). Methods: We developed Cx43F/F;Glutamate aspartate transporter (GLAST)-CreER(T2)KI/+ mice as gray matter specific Cx43 conditional knock-out (Cx43cKO) mice. We induced MOG-EAE 10 days after tamoxifen injection, and analyze its clinical course and pathology. We used Cx43F/F mice as controls. Results: EAE was significantly milder in gray matter astrocyte-specific Cx43cKO mice from acute phase to chronic phase, as compared with control mice. Pathology demonstrated less demyelinating lesions and infiltrating cells. Infiltrating immune cells did not express Cx43 in the active demyelinating lesions of the lumbar cord in both groups. The expression level of Cx43 was similar between these two groups in the spleen and the inguinal lymph nodes. Interpretation: Acute KO of gray matter specific Cx43 before induction of EAE reduce its aggressiveness. This finding may suggest the possibility that gray matter Cx43 modify the MS pathophysiology.
2021-04-20 | GSE148929 | GEO
Project description:During the course of multiple sclerosis (MS), inflammatory insults drive neuro-axonal loss and disability progression. However, pathways that guide neurons toward survival or death during central nervous system (CNS) inflammation are largely unexplored. Here we show that somatic deposition of the presynaptic protein bassoon (Bsn) in inflamed neurons directly contributes to neurodegeneration in MS. By comparing neuron-specific RNA-seq of healthy mice to mice undergoing experimental autoimmune encephalomyelitis (EAE), the animal model of MS, we identified key components of neurodegenerative pathways, including reduced mitochondrial ATP synthesis and increased protein catabolism. These changes were accompanied by neuronal induction and deposition of the intrinsically disordered protein Bsn in both EAE and in patients with MS. Somatic Bsn also accumulated in Bsn-overexpressing Neuro-2a (N2a) cells and single cell RNA-seq revealed dose-dependent repression of energy metabolism and induction of the unfolded protein response, reminiscent of our in vivo findings. Furthermore, Bsn overexpression in N2a cells or in Drosophila melanogaster neurons led to decreased survival and shortened lifespan, respectively. Conversely, genetic disruption of Bsn in mice was neuroprotective, with reduced neuro-axonal injury and clinical disability during EAE, establishing a toxic gain-of-function of Bsn during CNS inflammation. Our study provides systemic insights into neuronal responses to inflammation and identifies protein accumulation as a generic pathomechanism uniting primary and inflammatory neurodegeneration. Moreover, it offers a new explanation and possible treatment strategy to halt disability progression in MS, irrespective of immunotherapies.
2019-04-03 | GSE104899 | GEO
Project description:During the course of multiple sclerosis (MS), inflammatory insults drive neuro-axonal loss and disability progression. However, pathways that guide neurons toward survival or death during central nervous system (CNS) inflammation are largely unexplored. Here we show that somatic deposition of the presynaptic protein bassoon (Bsn) in inflamed neurons directly contributes to neurodegeneration in MS. By comparing neuron-specific RNA-seq of healthy mice to mice undergoing experimental autoimmune encephalomyelitis (EAE), the animal model of MS, we identified key components of neurodegenerative pathways, including reduced mitochondrial ATP synthesis and increased protein catabolism. These changes were accompanied by neuronal induction and deposition of the intrinsically disordered protein Bsn in both EAE and in patients with MS. Somatic Bsn also accumulated in Bsn-overexpressing Neuro-2a (N2a) cells and single cell RNA-seq revealed dose-dependent repression of energy metabolism and induction of the unfolded protein response, reminiscent of our in vivo findings. Furthermore, Bsn overexpression in N2a cells or in Drosophila melanogaster neurons led to decreased survival and shortened lifespan, respectively. Conversely, genetic disruption of Bsn in mice was neuroprotective, with reduced neuro-axonal injury and clinical disability during EAE, establishing a toxic gain-of-function of Bsn during CNS inflammation. Our study provides systemic insights into neuronal responses to inflammation and identifies protein accumulation as a generic pathomechanism uniting primary and inflammatory neurodegeneration. Moreover, it offers a new explanation and possible treatment strategy to halt disability progression in MS, irrespective of immunotherapies.
2019-04-03 | GSE104898 | GEO
Project description:During the course of multiple sclerosis (MS), inflammatory insults drive neuro-axonal loss and disability progression. However, pathways that guide neurons toward survival or death during central nervous system (CNS) inflammation are largely unexplored. Here we show that somatic deposition of the presynaptic protein bassoon (Bsn) in inflamed neurons directly contributes to neurodegeneration in MS. By comparing neuron-specific RNA-seq of healthy mice to mice undergoing experimental autoimmune encephalomyelitis (EAE), the animal model of MS, we identified key components of neurodegenerative pathways, including reduced mitochondrial ATP synthesis and increased protein catabolism. These changes were accompanied by neuronal induction and deposition of the intrinsically disordered protein Bsn in both EAE and in patients with MS. Somatic Bsn also accumulated in Bsn-overexpressing Neuro-2a (N2a) cells and single cell RNA-seq revealed dose-dependent repression of energy metabolism and induction of the unfolded protein response, reminiscent of our in vivo findings. Furthermore, Bsn overexpression in N2a cells or in Drosophila melanogaster neurons led to decreased survival and shortened lifespan, respectively. Conversely, genetic disruption of Bsn in mice was neuroprotective, with reduced neuro-axonal injury and clinical disability during EAE, establishing a toxic gain-of-function of Bsn during CNS inflammation. Our study provides systemic insights into neuronal responses to inflammation and identifies protein accumulation as a generic pathomechanism uniting primary and inflammatory neurodegeneration. Moreover, it offers a new explanation and possible treatment strategy to halt disability progression in MS, irrespective of immunotherapies.
2019-04-03 | GSE104897 | GEO
Project description:Background: Prenatal exposure to air pollutants is associated with increased risk for neurodevelopmental and neurodegenerative disorders. However, few studies have identified transcriptional changes related to air pollutant exposure. Methods: RNA sequencing was used to examine transcriptomic changes in blood and cerebral cortex of three male and three female mouse neonates prenatally exposed to traffic-related nano-sized particulate matter (nPM) compared to three male and three female mouse neonates prenatally exposed to control filter air. Results: We identified 19 nPM-associated differentially expressed genes (nPM-DEGs) in blood and 124 nPM-DEGs in cerebral cortex. The cerebral cortex transcriptional responses to nPM suggested neuroinflammation involvement, including CREB1, BDNF, and IFN γ genes. Both blood and brain tissues showed nPM transcriptional changes related to DNA damage, oxidative stress, and immune responses. Three blood nPM-DEGs showed a canonical correlation of 0.98 with 14 nPM-DEGS in the cerebral cortex, suggesting a convergence of gene expression changes in blood and cerebral cortex. Exploratory sex-stratified analyses suggested a higher number of nPM-DEGs in female cerebral cortex than male cerebral cortex. The sex-stratified analyses identified 2 nPM-DEGs (Rgl2 and Gm37534) shared between blood and cerebral cortex in a sex-dependent manner. Conclusions: Our findings suggest that prenatal nPM exposure induces transcriptional changes in the cerebral cortex, some of which are also observed in blood. Further research is needed to replicate nPM-induced transcriptional changes with additional biologically relevant time points for brain development.
2021-08-25 | GSE142453 | GEO
Project description:ntracranial electroencephalography (EEG) is commonly used to study epileptogenesis and epilepsy in experimental models. Chronic gliosis and neurodegeneration at the injury site are known to be associated with surgically implanted electrodes in both humans and experimental models. Currently, however, there are no reports on the impact of intracerebral electrodes on proteins in the hippocampus and proinflammatory cytokines in the cerebral cortex and plasma in experimental models. We used an unbiased, label-free proteomics approach to identify the altered proteins in the hippocampus, and multiplex assay for cytokines in the cerebral cortex and plasma of C57BL/6J mice following bilateral surgical implantation of electrodes into the cerebral hemispheres.
2021-09-09 | PXD021554 | Pride