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Soluble 4R0N Tau Abrogates Endocytic Vesicular Dynamics
Tharun Selvam Mahendran1, S N Suresh2, Lakshmi Garimella1
1Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India.
Soluble tau disrupts endolysosomal and autophagic pathways, impacting amyloid precursor protein (APP) trafficking. This suggests a novel mechanism by which soluble tau may contribute to Alzheimer's disease pathogenesis.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Aggregated tau is a key feature in neurodegenerative diseases, but its pathogenic role is debated.
- Soluble tau's specific contribution to molecular pathogenesis, particularly in Alzheimer's disease (AD) endolysosomal and autophagic dysfunction, remains unclear.
Purpose of the Study:
- To investigate the impact of soluble 4R0N tau overexpression on endolysosomal and autophagic pathways.
- To determine how soluble tau affects the trafficking and localization of amyloid precursor protein (APP).
Main Methods:
- Overexpression of soluble 4R0N tau in cellular models.
- Analysis of endolysosomal and autophagic marker expression.
- Live-cell imaging to assess vesicular dynamics.
- Tracking of APP localization within the endocytic pathway.
Main Results:
- Soluble 4R0N tau overexpression altered expression of endolysosomal and autophagic markers.
- Live-cell imaging revealed impaired early endosome dynamics and maturation.
- APP was found to preferentially localize to endocytic compartments involved in amyloidogenic processing.
Conclusions:
- Soluble 4R0N tau disrupts endolysosomal system dynamics and autophagy.
- Altered APP trafficking suggests a potential modulation of amyloid-beta (Aβ) generation.
- These findings highlight soluble tau's role in early AD pathogenesis.
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