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Updated: Aug 17, 2026
Monitoring Cell-to-cell Transmission of Prion-like Protein Aggregates in Drosophila Melanogaster
Published on: March 12, 2018
Evidence for sequestration of polyglutamine inclusions by Drosophila myeloid leukemia factor
Woo-Yang Kim1, Zahra Fayazi, Xiankun Bao
1Department of Pharmacology and Toxicology, Center for Neuroscience, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY 14214, USA.
Abstract:
Intracellular inclusions of abnormally long polyglutamine tracts and neurotoxicity are the hallmarks of several hereditary neurodegenerative disorders, including Huntington's disease (HD). In Drosophila melanogaster, dMLF, an ortholog of human myeloid leukemia factors, hMLF1 and hMLF2, suppressed polyglutamine toxicity and colocalized with the inclusions. In transfected primary rat neuronal cultures, dMLF and its orthologs reduced the morphological phenotypes and inclusions. Furthermore, dMLF reduced the recruitment of CBP and Hsp70 into the inclusions, both of which are among many essential proteins apparently trapped in the inclusions. These data suggest that a possible mechanism of suppression by dMLF is via the sequestration of polyglutamine oligomers or inclusions.
Insights
Myeloid leukemia factors (MLF) suppress polyglutamine toxicity in neurodegenerative diseases like Huntington's disease by binding to toxic protein inclusions. This finding offers a potential therapeutic strategy for these conditions.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Hereditary neurodegenerative disorders, such as Huntington's disease (HD), are characterized by neurotoxicity and intracellular inclusions containing long polyglutamine tracts.
- Identifying factors that mitigate polyglutamine toxicity is crucial for understanding disease mechanisms and developing treatments.
Purpose of the Study:
- To investigate the role of Drosophila melanogaster myeloid leukemia factor (dMLF), an ortholog of human MLF1 and MLF2, in suppressing polyglutamine toxicity.
- To elucidate the mechanism by which dMLF exerts its protective effects.
Main Methods:
- Utilized Drosophila melanogaster as a model organism to study polyglutamine toxicity.
- Employed transfected primary rat neuronal cultures to assess the effects of dMLF and its orthologs.
- Examined the colocalization of dMLF with polyglutamine inclusions and its impact on protein recruitment (CBP, Hsp70).
Main Results:
- dMLF suppressed polyglutamine toxicity and colocalized with inclusions in Drosophila.
- dMLF and its orthologs reduced morphological phenotypes and inclusions in rat neuronal cultures.
- dMLF decreased the recruitment of CBP and Hsp70 into polyglutamine inclusions.
Conclusions:
- dMLF and its orthologs show potential in mitigating polyglutamine-induced neurotoxicity.
- The suppression mechanism may involve the sequestration of polyglutamine oligomers or inclusions by dMLF.
