Related Experiment Video

Updated: Aug 7, 2026

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
07:20

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

Autophagy promotes tumor cell survival and restricts necrosis, inflammation, and tumorigenesis

Kurt Degenhardt1, Robin Mathew, Brian Beaudoin

  • 1Center for Advanced Biotechnology and Medicine, 679 Hoes Lane, Piscataway, New Jersey 08854, USA.

Cancer Cell
|July 18, 2006
PubMed

Insights

Defective apoptosis makes cells tumorigenic. Inhibiting autophagy in these cells can restore cell death but may cause inflammation and faster tumor growth, suggesting autophagy

Area of Science:

  • Cell biology
  • Cancer research
  • Molecular oncology

Background:

  • Defective apoptosis (programmed cell death) is a hallmark of cancer, leading to uncontrolled cell proliferation.
  • The interplay between apoptosis, autophagy (cellular self-eating), and common cancer mutations remains incompletely understood.
  • Understanding these pathways is crucial for developing novel cancer therapies.

Purpose of the Study:

  • To investigate how common tumor mutations affect apoptosis-defective cells.
  • To explore the role of autophagy inhibition in sensitizing these cells to metabolic stress.
  • To determine the consequences of combined apoptosis and autophagy defects on cell death and tumor progression.

Main Methods:

  • Utilized immortalized epithelial cells with defective apoptosis.
  • Manipulated autophagy using AKT activation and beclin1 gene disruption.
  • Assessed cell death (apoptosis, necrosis) and tumor growth in vitro and in vivo under metabolic stress conditions.

Main Results:

  • Inhibition of autophagy in apoptosis-defective cells, via AKT activation or beclin1 disruption, induced sensitivity to metabolic stress.
  • Combined impairment of apoptosis and autophagy led to necrotic cell death.
  • Inhibiting autophagy in nutrient-limited, apoptosis-refractory tumors restored cell death but promoted inflammation and accelerated tumor growth.

Conclusions:

  • Autophagy inhibition can re-sensitize apoptosis-resistant tumors to cell death, but with detrimental side effects.
  • Autophagy may act as a tumor suppressor by managing metabolic stress and preventing necrosis.
  • Targeting autophagy in cancer therapy requires careful consideration of its dual role in cell survival and death.

More Related Videos

Cell-Based Drug Screening for Inhibitors of Autophagy Related 4B Cysteine Peptidase09:51

Cell-Based Drug Screening for Inhibitors of Autophagy Related 4B Cysteine Peptidase

Published on: June 30, 2023

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports07:44

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports

Published on: November 28, 2019

Related Concept Videos

Autophagic Cell Death01:18

Autophagic Cell Death

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.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
Autophagy01:27

Autophagy

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,...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
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.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...