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Related Concept Videos

Lysosomal Hydrolases01:22

Lysosomal Hydrolases

Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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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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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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Lysosomes01:31

Lysosomes

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Autophagic Cell Death

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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Autophagy in lysosomal storage disorders.

Andrew P Lieberman1, Rosa Puertollano, Nina Raben

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor, MI USA.

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Lysosomal storage disorders (LSDs) disrupt cellular clearance and impact autophagy. Research suggests LSDs may primarily be considered "autophagy disorders" due to impaired lysosome-autophagosome function.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Lysosomes are vital organelles regulating cellular clearance, cholesterol homeostasis, and immune response.
  • Lysosomal storage disorders (LSDs) result from lysosomal dysfunction, causing macromolecule accumulation and affecting multiple organ systems.
  • LSDs exhibit progressive phenotypes and diverse cellular abnormalities, including defects in signaling, lipid metabolism, and trafficking.

Purpose of the Study:

  • To review recent findings on the autophagic pathway in various LSDs.
  • To explore the interconnectedness of lysosomal function and autophagy.
  • To support the perspective of LSDs as primarily "autophagy disorders".

Main Methods:

  • Literature review of biochemical and cell biology studies on LSDs.
  • Analysis of the autophagic pathway in different LSD models.
  • Examination of cellular functions affected by lysosomal dysfunction.

Main Results:

  • Lysosomal storage in LSDs significantly impacts the autophagic pathway.
  • Defects in lysosomal function lead to impaired autophagosome clearance.
  • Abnormalities in cellular processes are linked to both lysosomal and autophagic dysfunction.

Conclusions:

  • LSDs demonstrate a profound impact on cellular autophagy.
  • The findings support viewing LSDs as disorders primarily affecting the autophagic process.
  • Further research into the interplay between lysosomes and autophagy is crucial for understanding and treating LSDs.