Astrocyte molecular signatures in Huntington’s disease.

Astrocyte molecular signatures in Huntington’s disease.

Publication date: Oct 16, 2019

Astrocytes are implicated in neurodegenerative disorders and may contribute to striatal neuron loss or dysfunction in Huntington’s disease (HD). Here, we assessed striatal astrocyte gene and protein signatures in two HD mouse models at three stages and compared our results to human HD data at four clinical grades and to mice exhibiting polyglutamine length-dependent pathology. We found disease-model and stage-specific alterations and discovered a core disease-associated astrocyte molecular signature comprising 62 genes that were conserved between mice and humans. Our results show little evidence of neurotoxic A1 astrocytes that have been proposed to be causal for neuronal death in neurodegenerative disorders such as HD. Furthermore, 61 of the 62-core gene expression changes within astrocytes were reversed in a HD mouse model by lowering astrocyte mutant huntingtin protein (mHTT) expression using zinc finger protein (ZFP) transcriptional repressors. Our findings indicate that HD astrocytes progressively lose essential normal functions, some of which can be remedied by lowering mHTT. The data have implications for neurodegenerative disease rescue and repair strategies as well as specific therapeutic relevance for mHTT reduction and contribute to a better understanding of fundamental astrocyte biology and its contributions to disease.

Diaz-Castro, B., Gangwani, Yu, X., Coppola, G., and Khakh, B.S. Astrocyte molecular signatures in Huntington’s disease. 06728. 2019 Sci Transl Med (11):514.

Concepts Keywords
Astrocyte Core disease
Astrocytes Neurodegenerative disorders
Huntingtin Branches of biology
Huntington Glial cells
Mutant Organ systems
Neurodegenerative Nervous system
Neurodegenerative Disorders Neurodegeneration
Neuron Neuroscience
Neurotoxic Senescence
Pathology Astrocyte
Repressors Huntingtin
Sci Astrogliosis
Striatal
Zinc Finger

Semantics

Type Source Name
drug DRUGBANK Tropicamide
disease DOID neurodegenerative disease
drug DRUGBANK Zinc
gene UNIPROT HTT
pathway BSID Gene Expression
disease MESH death
disease MESH neurodegenerative disorders

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