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Related Concept Videos

Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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...
Stress Response System01:21

Stress Response System

The stress response system, also known as the fight-or-flight response, is the body's automatic physiological reaction to perceived threats. Hans Selye introduced the concept of General Adaptation Syndrome (GAS) to describe the predictable pattern of changes that occur in response to stress. GAS consists of three sequential stages: alarm, resistance, and exhaustion. This model helps explain how chronic stress can contribute to health problems.
Alarm stage
In the alarm stage, the body's initial...

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Related Experiment Video

Updated: Jul 6, 2026

Measurements of Physiological Stress Responses in C. Elegans
10:36

Measurements of Physiological Stress Responses in C. Elegans

Published on: May 21, 2020

Heat shock response relieves ER stress.

Yu Liu1, Amy Chang

  • 1Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48104, USA.

The EMBO Journal
|March 8, 2008
PubMed
Summary

The heat shock response (HSR) can alleviate endoplasmic reticulum (ER) stress in cells lacking the unfolded protein response (UPR). HSR partially restores ER functions like translocation and ER-associated degradation (ERAD), aiding cell survival.

Area of Science:

  • Cellular Biology
  • Stress Response Pathways

Background:

  • Misfolded protein accumulation in the endoplasmic reticulum (ER) triggers cellular stress.
  • The unfolded protein response (UPR) is a key pathway to mitigate ER stress.
  • UPR-deficient cells exhibit sensitivity to ER stress and impaired ER functions.

Purpose of the Study:

  • To investigate if the heat shock response (HSR) can relieve ER stress.
  • To determine the impact of HSR on UPR-deficient cells and ER functions.

Main Methods:

  • Utilized a constitutively active Hsf1 transcription factor to induce HSR without heat shock.
  • Assessed the growth and ER functions (translocation, ER-associated degradation, ER-to-Golgi transport) of UPR-deficient cells under HSR.
  • Performed genomic analysis of HSR targets.

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Standardized Methods for Measuring Induction of the Heat Shock Response in Caenorhabditis elegans
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

Published on: December 18, 2013

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Last Updated: Jul 6, 2026

Measurements of Physiological Stress Responses in C. Elegans
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Published on: May 21, 2020

Standardized Methods for Measuring Induction of the Heat Shock Response in Caenorhabditis elegans
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Standardized Methods for Measuring Induction of the Heat Shock Response in Caenorhabditis elegans

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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
12:38

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

Published on: December 18, 2013

Main Results:

  • HSR rescued the growth of UPR-deficient cells challenged with ER stress.
  • HSR partially restored defects in translocation and ER-associated degradation.
  • HSR influenced ER-to-Golgi transport in a cargo-specific manner, linked to cargo receptor levels.
  • HSR is activated by ER stress in vivo and shares functional targets with UPR.

Conclusions:

  • HSR offers a compensatory mechanism to relieve ER stress, particularly in UPR-deficient cells.
  • HSR impacts multiple ER activities, including protein translocation, degradation, and transport.
  • The findings suggest a crosstalk between HSR and UPR pathways in managing cellular stress.