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siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
Published on: October 28, 2019
VCP/p97 modulates PtdIns3P production and autophagy initiation.
Lidia Wrobel1,2, Sandra M Hill1,2,3, Avraham Ashkenazi1,2
1Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, UK.
Valosin-containing protein (VCP) is crucial for cellular quality control and neurodegenerative disease. VCP regulates autophagy by controlling phosphatidylinositol-3-phosphate (PtdIns3P) levels and promoting autophagosome biogenesis.
Area of Science:
- Cell Biology
- Molecular Biology
- Neuroscience
Background:
- Valosin-containing protein (VCP/p97) is vital for cellular quality control.
- VCP dysfunction is linked to neurodegenerative diseases.
- VCP regulates autophagy, a key cellular degradation pathway.
Purpose of the Study:
- To investigate the role of VCP in autophagy induction.
- To elucidate the molecular mechanisms by which VCP modulates autophagy.
- To understand VCP's impact on phosphatidylinositol-3-phosphate (PtdIns3P) levels.
Main Methods:
- Studied VCP's interaction with the BECN1-containing phosphatidylinositol 3-kinase (PtdIns3K) complex.
- Assessed the effect of VCP on ATXN3 (ataxin 3) deubiquitinase activity.
- Measured PtdIns3P production and recruitment of autophagy markers (WIPI2, ATG16L1) upon VCP inhibition.
Main Results:
- VCP stabilizes BECN1 protein levels by stimulating ATXN3 activity.
- VCP promotes the assembly and kinase activity of the PtdIns3K complex.
- VCP inhibition reduces PtdIns3P production and impairs autophagosome biogenesis.
Conclusions:
- VCP is essential for autophagy induction by regulating PtdIns3P levels.
- VCP promotes autophagosome biogenesis, expanding its known role in autophagy.
- VCP's role in autophagy highlights its significance in cellular homeostasis and neurodegeneration.
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