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Related Concept Videos

Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
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Lysosomal Hydrolases

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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Published on: January 31, 2025

Sphingolipids in macroautophagy.

Grégory Lavieu1, Francesca Scarlatti, Giusy Sala

  • 1Department of Physiology and Cellular Biophysics, Columbia University, New York, NY. USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 22, 2008
PubMed
Summary
This summary is machine-generated.

The study reveals that sphingolipids, ceramide and sphingosine 1-phosphate (S1P), stimulate macroautophagy. This finding highlights the role of these lipid messengers in regulating cellular processes and survival.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Sphingolipids, including ceramide and sphingosine 1-phosphate (S1P), are crucial components of cell membranes.
  • Ceramide and S1P function as signaling molecules, regulating cell death, proliferation, and survival.
  • Macroautophagy is a key lysosomal degradation pathway influencing cellular lifespan.

Purpose of the Study:

  • To investigate the role of sphingolipid messengers (ceramide and S1P) in the regulation of macroautophagy.
  • To determine if ceramide and S1P influence the process of autophagy.

Main Methods:

  • Utilized chemical and genetic approaches to study sphingolipid effects.
  • Employed GFP-LC3 staining to monitor autophagic flux.
  • Assessed the degradation of long-lived proteins to quantify autophagy.

Main Results:

  • Both ceramide and S1P were found to stimulate macroautophagy.
  • Evidence from GFP-LC3 staining indicated increased autophagic activity.
  • Analysis of protein degradation confirmed enhanced lysosomal catabolism.

Conclusions:

  • Ceramide and S1P are potent stimulators of macroautophagy.
  • Sphingolipid signaling pathways are involved in the regulation of this essential cellular process.