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Assays for the Degradation of Misfolded Proteins in Cells
Published on: August 28, 2016
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SnapShot: Organelle degradation
1Department of Biochemistry and Molecular Biology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan.
Molecular Cell
|April 22, 2022
Summary
Cellular organelles undergo continuous turnover for homeostasis. Lysosomes degrade most organelles through various pathways, while some, like in lens cells, use cytosolic phospholipases.
Area of Science:
- Cell Biology
- Molecular Biology
Background:
- Cellular homeostasis relies on the continuous turnover of organelles.
- Lysosomes play a crucial role in degrading cellular components, including organelles.
Purpose of the Study:
- To summarize the diverse pathways involved in organelle degradation.
- To highlight the role of lysosomes and alternative mechanisms in organelle turnover.
Main Methods:
- Literature review of organelle degradation pathways.
- Analysis of lysosomal degradation routes (macroautophagy, microautophagy, etc.).
- Examination of non-lysosomal degradation in specific cell types (e.g., lens fiber cells).
Main Results:
- Most organelles, including the nucleus, are degraded via lysosomal pathways.
- Specific pathways include macroautophagy, microautophagy, organelle-derived vesicle degradation, and crinophagy.
- Cytosolic phospholipases mediate organelle degradation in certain cells, such as lens fiber cells.
Conclusions:
- Organelle turnover is essential for cellular function and adaptation.
- Lysosomes are the primary degradative machinery for organelles.
- Alternative degradation mechanisms exist for specific cellular contexts.
