TR-FRET-Based Duplex Immunoassay Reveals an Inverse Correlation of Soluble and Aggregated Mutant huntingtin in Huntington's Disease
2012
Summary
Huntington's disease(HD) is an inherited neurodegenerative disorder caused by the amplification of a polyglutamine stretch at the
N terminusof the
huntingtinprotein. N-terminal fragments of the mutant
huntingtin(mHtt) aggregate and form intracellular inclusions in brain and peripheral tissues. Aggregates are an important hallmark of the disease, translating into a high need to quantify them in vitro and in vivo. We developed a one-step TR-FRET-based immunoassay to quantify soluble and aggregated mHtt in cell and tissue homogenates. Strikingly, quantification revealed a decrease of soluble mHtt correlating with an increase of aggregated protein in primary neuronal cell cultures, transgenic R6/2, and Hdh Q150 knock-in HD mice. These results emphasize the assay's efficiency for highly sensitive and quantitative detection of soluble and aggregated mHtt and its application in
high-throughput screeningand characterization of HD models.
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