Astrocytic contributions to Huntington's disease pathophysiology

Area of Science:

• Neuroscience
• Genetics
• Cell Biology

Background:

• Huntington's disease (HD) is a fatal neurodegenerative disorder caused by a CAG expansion in the huntingtin (HTT) gene.
• Mutant huntingtin proteins (mHTT) affect various cells, with particular vulnerability in the striatum.
• Striatal astrocytes, abundant glial cells, accumulate mHTT in HD.

Purpose of the Study:

• To investigate the role of striatal astrocytes in Huntington's disease pathophysiology.
• To summarize astrocytic contributions to molecular pathology and disease phenotypes in HD models.
• To explore the potential of targeting astrocytes for therapeutic interventions in HD.

Main Methods:

• Review of studies on striatal astrocytes in HD mouse models.
• Analysis of astrocyte alterations in human HD cases.
• Examination of cellular morphology, ion/neurotransmitter homeostasis, and metabolic support in astrocytes.

Main Results:

• Striatal astrocytes exhibit dysfunction in morphology, homeostasis, and metabolic support during HD progression.
• These astrocytic dysfunctions are observed in transgenic mouse models, human cellular models, and chimeric models of HD.
• Astrocytes actively participate in and contribute to the molecular pathophysiology and phenotypes of HD.

Conclusions:

• Dysfunctional striatal astrocytes are integral to Huntington's disease pathogenesis.
• Targeting astrocyte-specific pathways holds therapeutic potential for restoring homeostasis in HD.
• Understanding glial pathology in HD can advance glial-directed therapeutics for neurodegenerative disorders.