A systematic review of tissue and single cell transcriptome/proteome studies of the brain in multiple sclerosis

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Abstract

Multiple sclerosis (MS) is an inflammatory demyelinating and degenerative disease of the central nervous system (CNS). Although inflammatory responses are efficiently treated, therapies for progression are scarce and suboptimal, and biomarkers to predict the disease course are insufficient. Cure or preventive measures for MS require knowledge of core pathological events at the site of the tissue damage. Novelties in systems biology have emerged and paved the way for a more fine-grained understanding of key pathological pathways within the CNS, but they have also raised questions still without answers. Here, we systemically review the power of tissue and single-cell/nucleus CNS omics and discuss major gaps of integration into the clinical practice. Systemic search identified 49 transcriptome and 11 proteome studies of the CNS from 1997 till October 2021. Pioneering molecular discoveries indicate that MS affects the whole brain and all resident cell types. Despite inconsistency of results, studies imply increase in transcripts/proteins of semaphorins, heat shock proteins, myelin proteins, apolipoproteins and HLAs. Different lesions are characterized by distinct astrocytic and microglial polarization, altered oligodendrogenesis, and changes in specific neuronal subtypes. In all white matter lesion types, CXCL12, SCD, CD163 are highly expressed, and STAT6- and TGFβ-signaling are increased. In the grey matter lesions, TNF-signaling seems to drive cell death, and especially CUX2-expressing neurons may be susceptible to neurodegeneration. The vast heterogeneity at both cellular and lesional levels may underlie the clinical heterogeneity of MS, and it may be more complex than the current disease phenotyping in the clinical practice. Systems biology has not solved the mystery of MS, but it has discovered multiple molecules and networks potentially contributing to the pathogenesis. However, these results are mostly descriptive; focused functional studies of the molecular changes may open up for a better interpretation. Guidelines for acceptable quality or awareness of results from low quality data, and standardized computational and biological pipelines may help to overcome limited tissue availability and the “snap shot” problem of omics. These may help in identifying core pathological events and point in directions for focus in clinical prevention.

OriginalsprogEngelsk
Artikelnummer761225
TidsskriftFrontiers in Immunology
Vol/bind13
ISSN1664-3224
DOI
StatusUdgivet - 2. mar. 2022

Bibliografisk note

Funding Information:
ME is thankful for the Postdoc Fellowship supported by Lundbeckfonden (R347-2020-2454). ZI is thankful for Scleroseforeningen (R399-A289099, R458-A31829, R431-A29926, R487-A33600, R521-A35417, R561-A38748, R588-A39895) and Independent Reseach Fund Denmark (9039-00370A) and Direktør Ejnar Jonasson kaldet Johnsen og Hustrus Mindelegat (A3458).

Funding Information:
ME is thankful for the Postdoc Fellowship supported by Lundbeckfonden (R347-2020-2454). ZI is thankful for Scleroseforeningen (R399-A289099, R458-A31829, R431-A29926, R487-A33600, R521-A35417, R561-A38748, R588-A39895) and Independent Reseach Fund Denmark (9039-00370A) and Direkt?r Ejnar Jonasson kaldet Johnsen og Hustrus Mindelegat (A3458).

Publisher Copyright:
Copyright © 2022 Elkjaer, Röttger, Baumbach and Illes.

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