The cytokines interleukin-6 and interferon-α induce distinct microglia phenotypes.
Central nervous system
Cytokine
Interferon-alpha
Interleukin-6
Microglia
Neuroinflammation
Phenotype
Journal
Journal of neuroinflammation
ISSN: 1742-2094
Titre abrégé: J Neuroinflammation
Pays: England
ID NLM: 101222974
Informations de publication
Date de publication:
16 Apr 2022
16 Apr 2022
Historique:
received:
11
11
2021
accepted:
24
03
2022
entrez:
17
4
2022
pubmed:
18
4
2022
medline:
20
4
2022
Statut:
epublish
Résumé
Elevated production of the cytokines interleukin (IL)-6 or interferon (IFN)-α in the central nervous system (CNS) is implicated in the pathogenesis of neurological diseases such as neuromyelitis optica spectrum disorders or cerebral interferonopathies, respectively. Transgenic mice with CNS-targeted chronic production of IL-6 (GFAP-IL6) or IFN-α (GFAP-IFN) recapitulate important clinical and pathological features of these human diseases. The activation of microglia is a prominent manifestation found both in the human diseases and in the transgenic mice, yet little is known about how this contributes to disease pathology. Here, we used a combination of ex vivo and in situ techniques to characterize the molecular, cellular and transcriptomic phenotypes of microglia in GFAP-IL6 versus GFAP-IFN mice. In addition, a transcriptomic meta-analysis was performed to compare the microglia response from GFAP-IL6 and GFAP-IFN mice to the response of microglia in a range of neurodegenerative and neuroinflammatory disorders. We demonstrated that microglia show stimulus-specific responses to IL-6 versus IFN-α in the brain resulting in unique and extensive molecular and cellular adaptations. In GFAP-IL6 mice, microglia proliferated, had shortened, less branched processes and elicited transcriptomic and molecular changes associated with phagocytosis and lipid processing. In comparison, microglia in the brain of GFAP-IFN mice exhibited increased proliferation and apoptosis, had larger, hyper-ramified processes and showed transcriptomic and surface marker changes associated with antigen presentation and antiviral response. Further, a transcriptomic meta-analysis revealed that IL-6 and IFN-α both contribute to the formation of a core microglia response in animal models of neurodegenerative and neuroinflammatory disorders, such as Alzheimer's disease, tauopathy, multiple sclerosis and lipopolysaccharide-induced endotoxemia. Our findings demonstrate that microglia responses to IL-6 and IFN-α are highly stimulus-specific, wide-ranging and give rise to divergent phenotypes that modulate microglia responses in neuroinflammatory and neurodegenerative diseases.
Sections du résumé
BACKGROUND
BACKGROUND
Elevated production of the cytokines interleukin (IL)-6 or interferon (IFN)-α in the central nervous system (CNS) is implicated in the pathogenesis of neurological diseases such as neuromyelitis optica spectrum disorders or cerebral interferonopathies, respectively. Transgenic mice with CNS-targeted chronic production of IL-6 (GFAP-IL6) or IFN-α (GFAP-IFN) recapitulate important clinical and pathological features of these human diseases. The activation of microglia is a prominent manifestation found both in the human diseases and in the transgenic mice, yet little is known about how this contributes to disease pathology.
METHODS
METHODS
Here, we used a combination of ex vivo and in situ techniques to characterize the molecular, cellular and transcriptomic phenotypes of microglia in GFAP-IL6 versus GFAP-IFN mice. In addition, a transcriptomic meta-analysis was performed to compare the microglia response from GFAP-IL6 and GFAP-IFN mice to the response of microglia in a range of neurodegenerative and neuroinflammatory disorders.
RESULTS
RESULTS
We demonstrated that microglia show stimulus-specific responses to IL-6 versus IFN-α in the brain resulting in unique and extensive molecular and cellular adaptations. In GFAP-IL6 mice, microglia proliferated, had shortened, less branched processes and elicited transcriptomic and molecular changes associated with phagocytosis and lipid processing. In comparison, microglia in the brain of GFAP-IFN mice exhibited increased proliferation and apoptosis, had larger, hyper-ramified processes and showed transcriptomic and surface marker changes associated with antigen presentation and antiviral response. Further, a transcriptomic meta-analysis revealed that IL-6 and IFN-α both contribute to the formation of a core microglia response in animal models of neurodegenerative and neuroinflammatory disorders, such as Alzheimer's disease, tauopathy, multiple sclerosis and lipopolysaccharide-induced endotoxemia.
CONCLUSIONS
CONCLUSIONS
Our findings demonstrate that microglia responses to IL-6 and IFN-α are highly stimulus-specific, wide-ranging and give rise to divergent phenotypes that modulate microglia responses in neuroinflammatory and neurodegenerative diseases.
Identifiants
pubmed: 35429976
doi: 10.1186/s12974-022-02441-x
pii: 10.1186/s12974-022-02441-x
pmc: PMC9013466
doi:
Substances chimiques
Cytokines
0
Interferon-alpha
0
Interleukin-6
0
Types de publication
Journal Article
Meta-Analysis
Langues
eng
Sous-ensembles de citation
IM
Pagination
96Subventions
Organisme : Australian Government
ID : Research Training Program scholarship
Organisme : NINDS NIH HHS
ID : R01 NS088137
Pays : United States
Organisme : NIA NIH HHS
ID : R01 AG051812
Pays : United States
Organisme : NIA NIH HHS
ID : R01 AG054672
Pays : United States
Organisme : BrightFocus Foundation
ID : 2020A016806
Organisme : National Health and Medical Research Council Australia
ID : RG180378
Organisme : NEI NIH HHS
ID : R01 EY027921
Pays : United States
Informations de copyright
© 2022. The Author(s).
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