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Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

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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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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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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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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Related Experiment Video

Updated: Apr 15, 2026

In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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Mitophagy and cancer.

Aparajita H Chourasia1, Michelle L Boland2, Kay F Macleod3

  • 1The Ben May Department for Cancer Research, The University of Chicago, 929 East 57th Street, Chicago, IL 60637 USA ; The Committee on Cancer Biology, The University of Chicago, 929 East 57th Street, Chicago, IL 60637 USA.

Cancer & Metabolism
|March 27, 2015
PubMed
Summary

Mitophagy selectively degrades damaged mitochondria, aiding cellular survival during stress. Its role in cancer is complex, presenting challenges and opportunities for new therapies.

Keywords:
AutophagosomesBNIP3Mitochondrial dysfunctionMitophagyNIXParkin

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Mitophagy is a selective autophagic process targeting mitochondria for degradation.
  • It maintains mitochondrial pool integrity by removing damaged organelles.
  • Mitophagy also reduces mitochondrial mass under stress, promoting survival.

Purpose of the Study:

  • To review the dual role of mitophagy in tumorigenesis.
  • To explore targeting mitophagy as a cancer therapeutic strategy.
  • To discuss challenges and opportunities in mitophagy-based cancer therapy.

Main Methods:

  • Literature review of mitophagy mechanisms and cancer relevance.
  • Analysis of mitophagy's role in cellular stress responses.
  • Evaluation of therapeutic potential and challenges.

Main Results:

  • Mitophagy's role in cancer is context-dependent, acting both positively and negatively.
  • Dysregulation of mitochondrial turnover is linked to oncogenesis.
  • Targeting mitophagy offers potential but requires further exploration.

Conclusions:

  • Mitophagy's complex role in cancer necessitates careful consideration for therapeutic strategies.
  • Further research is needed to harness mitophagy for cancer treatment.
  • Understanding mitophagy's specific pathways is key to developing targeted therapies.