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Inhibition of astrocytic DRD2 suppresses CNS inflammation in an animal model of multiple sclerosis

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE205292 | GEO | 2022/07/15

REPOSITORIES: GEO

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Inhibition of astrocytic DRD2 suppresses CNS inflammation in an animal model of multiple sclerosis [astrocyte]

Project description:Astrocyte activation is associated with progressive inflammatory demyelination in multiple sclerosis (MS). The molecular mechanisms underlying astrocyte activation remain incompletely understood. Recent studies have suggested that classical neurotransmitter receptors are implicated in the modulation of brain innate immunity. We investigated the role of dopamine signaling in the process of astrocyte activation. Here, we show the upregulation of dopamine D2 receptor (DRD2) in reactive astrocytes in MS brain and non-canonical role of astrocytic DRD2 in MS pathogenesis. Mice deficient in astrocytic Drd2 exhibit a remarkable suppression of reactive astrocytes and inflammation which are highly correlated with the amelioration of experimental autoimmune encephalomyelitis (EAE). Mechanistically, DRD2 regulates the expression of 6-pyruvoyl-tetrahydropterin synthase which modulates NF-κB activity through protein kinase C-δ. Pharmacological blockade of astrocytic DRD2 with a DRD2 antagonist dehydrocorybulbine remarkably inhibits the inflammatory response in mice lacking Drd2 in neurons. Together, our findings reveal previously uncharted roles for a DRD2 in astrocyte activation during EAE-associated CNS inflammation. Its therapeutic inhibition may provide a potent lever to alleviate autoimmune diseases.

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Inhibition of astrocytic DRD2 suppresses CNS inflammation in an animal model of multiple sclerosis [spinal cord]

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Inhibition of astrocytic DRD2 suppresses CNS inflammation in an animal model of multiple sclerosis

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