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Related Concept Videos

Stress Response System01:21

Stress Response System

1.1K
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...
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Physiological Foundation of Stress01:24

Physiological Foundation of Stress

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Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...
893
Components of Stress01:23

Components of Stress

609
Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
609
Psychological Responses to Stress01:20

Psychological Responses to Stress

831
Psychological responses to stress encompass the various cognitive and emotional reactions individuals experience when faced with challenging or threatening situations, such as a job loss. Prolonged exposure to stressors can disturb emotional balance, increasing negative emotions (e.g., anxiety and sadness) and diminishing positive emotions (e.g., joy and satisfaction). These persistent emotional shifts are associated with an increased risk of both physical illness and mental health issues, such...
831
Introduction to Stress and Lifestyle01:27

Introduction to Stress and Lifestyle

757
Stress is a multifaceted response to events perceived as challenging or threatening, highlighting physical, emotional, cognitive, and behavioral reactions. Physically, stress can lead to fatigue, sleep disruptions, and various health issues such as frequent colds, chest pains, and nausea. Emotionally, it can manifest as anxiety, depression, irritability, and anger triggered by both minor and major life events. Cognitively, it may result in difficulty in concentration, memory, and...
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Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

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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...
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Related Experiment Video

Updated: Mar 15, 2026

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

Measurements of Physiological Stress Responses in C. Elegans

Published on: May 21, 2020

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The integrated stress response.

Karolina Pakos-Zebrucka1, Izabela Koryga1, Katarzyna Mnich1

  • 1Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland School of Natural Sciences, National University of Ireland Galway, Galway, Ireland.

EMBO Reports
|September 16, 2016
PubMed
Summary
This summary is machine-generated.

Cells activate the integrated stress response (ISR) to survive stress by regulating protein synthesis and gene expression. This adaptive pathway, involving eIF2α phosphorylation, can promote survival or cell death depending on stress severity.

Keywords:
activating transcription factor 4eIF2α kinaseeukaryotic translation initiation factor 2 alphaintegrated stress response

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Stress Response

Background:

  • Eukaryotic cells employ the integrated stress response (ISR) to maintain homeostasis under various stress conditions.
  • The ISR involves the phosphorylation of eukaryotic translation initiation factor 2 alpha (eIF2α) by specific kinases.
  • This leads to reduced global protein synthesis and increased expression of genes like ATF4, crucial for cellular recovery.

Purpose of the Study:

  • To review the signaling mechanisms of the ISR.
  • To elucidate how ISR signaling regulates cell fate decisions under stress.

Main Methods:

  • Literature review of ISR signaling pathways.
  • Analysis of how ISR components mediate cellular responses to stress.

Main Results:

  • The ISR is a conserved adaptive pathway crucial for cellular homeostasis.
  • eIF2α phosphorylation is a central event, modulating protein synthesis and gene expression.
  • The ISR's outcome (survival vs. cell death) is context-dependent on stress type, intensity, and cellular environment.

Conclusions:

  • The ISR is a critical regulator of cell fate under stress.
  • Understanding ISR signaling provides insights into cellular adaptation and potential therapeutic targets.