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Related Concept Videos

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,...
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...
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...
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...
The Unfolded Protein Response01:37

The Unfolded Protein Response

The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
The Proteasome01:13

The Proteasome

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.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...

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Related Experiment Video

Updated: May 11, 2026

Analyzing Starvation-Induced Autophagy in the Drosophila melanogaster Larval Fat Body
06:02

Analyzing Starvation-Induced Autophagy in the Drosophila melanogaster Larval Fat Body

Published on: August 4, 2022

Selective autophagy: talking with the UPS.

Caroline Park1, Ana Maria Cuervo

  • 1Department of Developmental and Molecular Biology, Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY, USA.

Cell Biochemistry and Biophysics
|May 28, 2013
PubMed
Summary
This summary is machine-generated.

Cellular protein degradation involves complex communication between the autophagic pathway and the ubiquitin/proteasome system. This cross-talk is crucial for cellular function and may offer therapeutic targets in disease.

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Assessing Autophagic Flux by Measuring LC3, p62, and LAMP1 Co-localization Using Multispectral Imaging Flow Cytometry
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Assessing Autophagic Flux by Measuring LC3, p62, and LAMP1 Co-localization Using Multispectral Imaging Flow Cytometry

Published on: July 21, 2017

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

Published on: January 31, 2025

Related Experiment Videos

Last Updated: May 11, 2026

Analyzing Starvation-Induced Autophagy in the Drosophila melanogaster Larval Fat Body
06:02

Analyzing Starvation-Induced Autophagy in the Drosophila melanogaster Larval Fat Body

Published on: August 4, 2022

Assessing Autophagic Flux by Measuring LC3, p62, and LAMP1 Co-localization Using Multispectral Imaging Flow Cytometry
11:39

Assessing Autophagic Flux by Measuring LC3, p62, and LAMP1 Co-localization Using Multispectral Imaging Flow Cytometry

Published on: July 21, 2017

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

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Proteolytic systems, including the ubiquitin/proteasome system and autophagy, degrade cellular proteins.
  • It is now understood that proteins can be degraded by multiple pathways, indicating pathway cross-talk.

Purpose of the Study:

  • To review the communication (cross-talk) between autophagic pathways and the ubiquitin/proteasome system.
  • To provide examples of compensatory mechanisms in pathological conditions.
  • To discuss therapeutic potential targeting cross-talk modulators.

Main Methods:

  • Literature review of studies on proteolytic systems.
  • Analysis of cross-talk mechanisms between autophagy and the ubiquitin/proteasome system.
  • Examination of pathological conditions involving proteolytic pathway dysregulation.

Main Results:

  • Proteolytic pathways exhibit significant cross-talk, with shared substrates and regulatory interactions.
  • Cells can compensate for the blockage of one pathway by upregulating others.
  • Effectors and regulators of one system can be degraded by another, creating regulatory loops.

Conclusions:

  • The interplay between autophagy and the ubiquitin/proteasome system is a fundamental aspect of cellular proteostasis.
  • Understanding this cross-talk is vital for comprehending cellular responses to stress and disease.
  • Targeting the modulators of this proteolytic communication presents a promising therapeutic avenue.