Modeling pathogenesis of Huntington's disease with inducible neuroprogenitor cells

Area of Science:

• Neuroscience
• Genetics
• Cell Biology

Background:

• Huntington's disease (HD) is a neurodegenerative disorder caused by CAG trinucleotide repeat expansion in the huntingtin (htt) gene.
• Current understanding of HD pathogenesis is limited by the lack of reliable disease models.

Purpose of the Study:

• To establish a novel neuronal cell model for Huntington's disease.
• To investigate the utility of this model for studying HD neuropathogenesis and therapeutic screening.

Main Methods:

• Utilized a tetracycline-regulated rat neuroprogenitor cell line (HC2S2).
• Introduced enhanced green fluorescence protein (EGFP)-tagged wild-type (28Q) and mutant (74Q) huntingtin exon 1.
• Assessed neuronal differentiation, cell death, neuritic degeneration, oxidative stress vulnerability, and protein aggregation.

Main Results:

• The HC2S2 cell lines expressing 28Q and 74Q htt showed normal neuronal differentiation.
• Mutant htt (74Q) expressing cells exhibited increased time-dependent cell death, neuritic degeneration, and oxidative stress sensitivity.
• Protein aggregation was observed in 74Q cells under neuronal aging or oxidative stress conditions.

Conclusions:

• The developed neuroprogenitor cell lines effectively recapitulate major neuropathological features of Huntington's disease.
• This model serves as a valuable tool for investigating HD neuropathogenesis.
• The model is suitable for high-throughput screening of therapeutic compounds for Huntington's disease.