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Active HSF1 significantly suppresses polyglutamine aggregate formation in cellular and mouse models
Mitsuaki Fujimoto1, Eiichi Takaki, Tetsuya Hayashi
1Department of Biochemistry and Molecular Biology, Yamaguchi University School of Medicine, Ube 775-8505, Japan.
The Journal of Biological Chemistry
|July 30, 2005
Summary
Active heat shock transcription factor 1 (HSF1) significantly suppresses polyglutamine aggregates in neurodegenerative diseases. This approach improved disease progression and extended lifespan in mouse models, offering a novel therapeutic strategy.
Area of Science:
- Neurodegenerative diseases
- Molecular biology
- Genetics
Background:
- Polyglutamine diseases involve protein misfolding and aggregation.
- Heat shock proteins (Hsps) can suppress these aggregates.
Purpose of the Study:
- To investigate the impact of active heat shock transcription factor 1 (HSF1) on polyglutamine diseases.
- To assess HSF1's effectiveness compared to combined Hsp overexpression.
Main Methods:
- Utilized cell cultures and transgenic mouse models (R6/2 Huntington disease mice crossed with HSF1Tg mice).
- Analyzed polyglutamine inclusion formation, weight loss, and lifespan.
Main Results:
- Active HSF1 suppressed polyglutamine inclusion formation more effectively than combined Hsps in cell cultures.
- Transgenic mice (R6/2/HSF1Tg) showed reduced inclusion formation and weight loss.
- Unexpectedly, lifespan was significantly improved in R6/2/HSF1Tg mice, even without brain expression of active HSF1.
Conclusions:
- Active HSF1 demonstrates a potent inhibitory effect on polyglutamine aggregate formation both in vitro and in vivo.
- HSF1 may regulate unknown genes in addition to major Hsps, contributing to its efficacy.
- Targeting HSF1 presents a promising therapeutic avenue for polyglutamine diseases.