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Related Concept Videos

Autophagy01:27

Autophagy

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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.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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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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Autophagic Cell Death01:18

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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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Lysosomal Hydrolases01:22

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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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The Proteasome01:13

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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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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Related Experiment Video

Updated: Oct 22, 2025

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

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Autophagy in major human diseases.

Daniel J Klionsky1, Giulia Petroni2, Ravi K Amaravadi3,4

  • 1Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA.

The EMBO Journal
|August 30, 2021
PubMed
Summary

Autophagy is vital for cell health. Disrupting this process, through genetics or drugs, can worsen many diseases, including cancer and neurodegenerative conditions.

Keywords:
agingcancerinflammationmetabolic syndromesneurodegeneration

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Area of Science:

  • Cellular Biology
  • Molecular Medicine

Background:

  • Autophagy is a fundamental cellular process crucial for maintaining homeostasis.
  • Impaired autophagy is linked to disease development in various experimental models.
  • Genetic defects in autophagy-related pathways cause severe human diseases.

Purpose of the Study:

  • To review and discuss preclinical evidence connecting autophagy dysfunction to the pathogenesis of major human disorders.
  • To highlight the broad impact of autophagy in health and disease.

Main Methods:

  • Literature review of preclinical data.
  • Synthesis of research linking autophagy to various disease categories.

Main Results:

  • Autophagy dysfunction is implicated in the pathogenesis of numerous disorders.
  • Specific examples include cancer, cardiovascular, neurodegenerative, metabolic, pulmonary, renal, infectious, musculoskeletal, and ocular diseases.

Conclusions:

  • Autophagy plays a critical role in preventing and mitigating a wide spectrum of human diseases.
  • Understanding autophagy dysfunction is key for developing therapeutic strategies for complex disorders.