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Delivery Pathways to the Lysosome01:36

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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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Autophagy01:27

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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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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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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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Selective autophagy: lysophagy.

Junya Hasegawa1, Ikuko Maejima2, Ryo Iwamoto3

  • 1Laboratory of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan; Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan.

Methods (San Diego, Calif.)
|December 28, 2014
PubMed
Summary

Lysophagy, the selective engulfment of damaged lysosomes via autophagy, is crucial for cellular health. New methods allow monitoring lysophagy in cells, aiding disease research and therapeutic target discovery.

Keywords:
AutophagyGalectinLysophagytfGalectin

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Disease Pathogenesis

Background:

  • Autophagy is a cellular degradation process, with selective forms like xenophagy and mitophagy implicated in diseases.
  • Lysosomes, vital organelles, can be damaged by toxins and crystals, potentially causing neurodegeneration.
  • Lysophagy, the selective autophagy of injured lysosomes, is an emerging area of research.

Purpose of the Study:

  • To provide an overview of methods for monitoring lysophagy in mammalian cultured cells.
  • To facilitate the evaluation of molecules involved in selective autophagy.
  • To aid in screening for novel proteins engaged in selective autophagy.

Main Methods:

  • Overview of established and emerging techniques for lysophagy detection.
  • Application of these methods in mammalian cell culture models.
  • Utilizing these methods for molecular and genetic screening approaches.

Main Results:

  • Established methods enable the monitoring of lysophagy in various cellular contexts.
  • These techniques are adaptable for assessing the role of specific proteins in lysophagy.
  • The described methods support the identification of new components of the selective autophagy pathway.

Conclusions:

  • Monitoring lysophagy is essential for understanding its role in cellular homeostasis and disease.
  • The presented methods offer valuable tools for lysophagy research.
  • Lysophagy represents a promising therapeutic target for diseases linked to lysosomal damage.