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Interferon-induced immunoproteasomes disturb neuronal metabolism and drive neurodegeneration in multiple sclerosis [RNS_Seq3_Nuclei]

ABSTRACT: Interferon-induced immunoproteasomes disturb neuronal metabolism and drive neurodegeneration in multiple sclerosis [RNS_Seq3_Nuclei]

PROVIDER: PRJNA1174119 | ENA |

REPOSITORIES: ENA

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Interferon-induced immunoproteasomes disturb neuronal metabolism and drive neurodegeneration in multiple sclerosis [RNA_Seq2_IFNG]

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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.

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Project description:The purpose of this study was to characterize the transcriptional effects induced by intramuscular IFN-beta-1a treatment (Avonex, 30 Âµg once weekly) in patients with relapsing-remitting form of multiple sclerosis (MS). By using Affymetrix DNA microarrays, we obtained genome-wide expression profiles of peripheral blood mononuclear cells from 24 MS patients within the first four weeks of IFN-beta administration. Keywords: Multiple sclerosis, Interferon, Pharmacogenomics, Affymetrix EDTA blood samples were taken from all patients immediately before first, second and fifth IFN-beta injection. Total RNA of Ficoll-isolated peripheral blood mononuclear cells from each sample was extracted, labelled and hybridized to Affymetrix Human Genome U133 A and B arrays to quantify the mRNA levels.

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