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Updated: Jun 26, 2026
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Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons
Published on: November 6, 2017
Alix and ALG-2 make a link between endosomes and neuronal death
Anne-Laure Mahul-Mellier1, Flavie Strappazzon, Christine Chatellard-Causse
1INSERM, U836, Equipe 2, Neurodégénérescence et Plasticité, Grenoble, F-38042, France.
Biochemical Society Transactions
|January 16, 2009
Summary
Alix (apoptosis-linked gene 2)-interacting protein X) binds ALG-2 and regulates neuronal death. This study suggests Alix couples endosomes to cell death machinery via interactions with caspases and TNFR1.
Area of Science:
- Cell Biology
- Molecular Biology
- Neuroscience
Background:
- Alix (apoptosis-linked gene 2)-interacting protein X) is an adaptor protein that binds ALG-2 (apoptosis-linked gene 2).
- Alix plays a role in neuronal death, interacting with ALG-2 and ESCRT proteins involved in endosomal trafficking.
- The precise function of Alix in endosomal trafficking remains unclear.
Purpose of the Study:
- To elucidate the function of Alix in the context of cell death.
- To investigate the molecular interactions of Alix, ALG-2, caspases, and TNFR1.
Main Methods:
- Biochemical assays to detect protein complex formation.
- Analysis of interactions between Alix, ALG-2, caspases, and tumor necrosis factor receptor 1 (TNFR1).
Main Results:
- Alix and ALG-2 form a calcium-dependent complex with apical caspases.
- This complex also includes the endocytosed death receptor TNFR1.
- These findings suggest a direct link between endosomal trafficking and the cell death pathway.
Conclusions:
- Alix acts as a molecular bridge connecting endosomes with the cell death machinery.
- The interaction involves calcium, ALG-2, caspases, and TNFR1, highlighting a novel mechanism in programmed cell death.
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