A systems-level analysis highlights microglial activation as a modifying factor in common epilepsies.
MRI
cortical thinning
gene expression
post mortem
Journal
Neuropathology and applied neurobiology
ISSN: 1365-2990
Titre abrégé: Neuropathol Appl Neurobiol
Pays: England
ID NLM: 7609829
Informations de publication
Date de publication:
02 2022
02 2022
Historique:
received:
31
03
2021
accepted:
15
07
2021
pubmed:
14
8
2021
medline:
8
4
2022
entrez:
13
8
2021
Statut:
ppublish
Résumé
The causes of distinct patterns of reduced cortical thickness in the common human epilepsies, detectable on neuroimaging and with important clinical consequences, are unknown. We investigated the underlying mechanisms of cortical thinning using a systems-level analysis. Imaging-based cortical structural maps from a large-scale epilepsy neuroimaging study were overlaid with highly spatially resolved human brain gene expression data from the Allen Human Brain Atlas. Cell-type deconvolution, differential expression analysis and cell-type enrichment analyses were used to identify differences in cell-type distribution. These differences were followed up in post-mortem brain tissue from humans with epilepsy using Iba1 immunolabelling. Furthermore, to investigate a causal effect in cortical thinning, cell-type-specific depletion was used in a murine model of acquired epilepsy. We identified elevated fractions of microglia and endothelial cells in regions of reduced cortical thickness. Differentially expressed genes showed enrichment for microglial markers and, in particular, activated microglial states. Analysis of post-mortem brain tissue from humans with epilepsy confirmed excess activated microglia. In the murine model, transient depletion of activated microglia during the early phase of the disease development prevented cortical thinning and neuronal cell loss in the temporal cortex. Although the development of chronic seizures was unaffected, the epileptic mice with early depletion of activated microglia did not develop deficits in a non-spatial memory test seen in epileptic mice not depleted of microglia. These convergent data strongly implicate activated microglia in cortical thinning, representing a new dimension for concern and disease modification in the epilepsies, potentially distinct from seizure control.
Identifiants
pubmed: 34388852
doi: 10.1111/nan.12758
pmc: PMC8983060
mid: NIHMS1790382
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e12758Subventions
Organisme : Medical Research Council Clinician Scientist Fellowship
ID : MR/N008324/1
Organisme : NINDS NIH HHS
ID : R21 NS107739
Pays : United States
Organisme : Medical Research Council
ID : MR/L016311/1
Pays : United Kingdom
Organisme : Medical Research Council
ID : MR/N008324/1
Pays : United Kingdom
Organisme : NIBIB NIH HHS
ID : U54 EB020403
Pays : United States
Organisme : NIH HHS
ID : R01 NS065838
Pays : United States
Organisme : NIH HHS
ID : S10 OD023696
Pays : United States
Organisme : NIBIB NIH HHS
ID : R01 EB015611
Pays : United States
Organisme : NIH HHS
ID : R01 NS097719
Pays : United States
Organisme : NINDS NIH HHS
ID : R01 NS122827
Pays : United States
Organisme : NINDS NIH HHS
ID : R01 NS065838
Pays : United States
Organisme : NINDS NIH HHS
ID : R01 NS097719
Pays : United States
Organisme : NIH HHS
ID : U54 EB020403
Pays : United States
Commentaires et corrections
Type : CommentIn
Informations de copyright
© 2021 The Authors. Neuropathology and Applied Neurobiology published by John Wiley & Sons Ltd on behalf of British Neuropathological Society.
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