Related Experiment Videos
Huntingtin is required for normal hematopoiesis
M Metzler1, C D Helgason, I Dragatsis
1Center for Molecular Medicine and Therapeutics, University of British Columbia, Department of Medical Genetics, 950 West 28th Avenue, Vancouver, British Columbia, Canada.
Human Molecular Genetics
|February 3, 2000
Summary
Huntingtin protein is crucial for hematopoietic cell development and expansion. Reduced huntingtin levels in Huntington's disease (HD) models impair hematopoietic stem and progenitor cell proliferation and survival.
Area of Science:
- Neuroscience
- Developmental Biology
- Hematology
Background:
- Huntington's disease (HD) is a neurodegenerative disorder linked to polyglutamine expansion in the huntingtin protein.
- Huntingtin is essential for embryonic development, with gene-targeted mice dying post-gastrulation.
- The role of huntingtin in hematopoiesis, despite its expression in immune organs, remains unexamined.
Purpose of the Study:
- To investigate the function of huntingtin in hematopoietic development.
- To elucidate potential pathological mechanisms in Huntington's disease related to hematopoiesis.
- To analyze the impact of huntingtin deficiency on hematopoietic cell generation and expansion.
Main Methods:
- Assessed huntingtin expression in various hematopoietic cell types.
- Utilized Huntington's disease (HD) +/- and HD -/- embryonic stem (ES) cell lines for in vitro hematopoiesis studies.
- Analyzed hematopoietic progenitor numbers, differentiation markers, and cell proliferation/survival in embryoid bodies and suspension cultures.
Main Results:
- HD +/- and HD -/- ES cells showed reduced hematopoietic progenitor numbers during in vitro differentiation.
- Hematopoiesis occurred in the absence of huntingtin, but proliferation and/or survival were significantly impaired in a gene dosage-dependent manner.
- Impairment was intrinsic to hematopoietic cells, confirmed by enrichment of CD34+ cells.
Conclusions:
- Huntingtin expression is necessary for the proper generation and expansion of hematopoietic cells.
- Huntingtin deficiency impacts hematopoietic stem and progenitor cell function.
- These findings offer a novel system to study huntingtin function and its role in HD pathogenesis.