A phenotypic screening platform for identifying chemical modulators of astrocyte reactivity

BLL Clayton, JD Kristell, KC Allan, EF Cohn… - Nature …, 2024 - nature.com
BLL Clayton, JD Kristell, KC Allan, EF Cohn, M Karl, AD Jerome, E Garrison
Nature neuroscience, 2024nature.com
Disease, injury and aging induce pathological reactive astrocyte states that contribute to
neurodegeneration. Modulating reactive astrocytes therefore represent an attractive
therapeutic strategy. Here we describe the development of an astrocyte phenotypic
screening platform for identifying chemical modulators of astrocyte reactivity. Leveraging this
platform for chemical screening, we identify histone deacetylase 3 (HDAC3) inhibitors as
effective suppressors of pathological astrocyte reactivity. We demonstrate that HDAC3 …
Abstract
Disease, injury and aging induce pathological reactive astrocyte states that contribute to neurodegeneration. Modulating reactive astrocytes therefore represent an attractive therapeutic strategy. Here we describe the development of an astrocyte phenotypic screening platform for identifying chemical modulators of astrocyte reactivity. Leveraging this platform for chemical screening, we identify histone deacetylase 3 (HDAC3) inhibitors as effective suppressors of pathological astrocyte reactivity. We demonstrate that HDAC3 inhibition reduces molecular and functional characteristics of reactive astrocytes in vitro. Transcriptional and chromatin mapping studies show that HDAC3 inhibition disarms pathological astrocyte gene expression and function while promoting the expression of genes associated with beneficial astrocytes. Administration of RGFP966, a small molecule HDAC3 inhibitor, blocks reactive astrocyte formation and promotes neuroprotection in vivo in mice. Collectively, these results establish a platform for discovering modulators of reactive astrocyte states, inform the mechanisms that control astrocyte reactivity and demonstrate the therapeutic benefits of modulating astrocyte reactivity for neurodegenerative diseases.
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