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Related Concept Videos

Physiological Foundation of Stress01:24

Physiological Foundation of Stress

85
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...
85
Stress Response System01:21

Stress Response System

113
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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Components of Stress01:23

Components of Stress

243
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...
243
Introduction to Stress and Lifestyle01:27

Introduction to Stress and Lifestyle

145
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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Applications of Stress01:04

Applications of Stress

367
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
367
Psychological Responses to Stress01:20

Psychological Responses to Stress

76
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...
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Related Experiment Video

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An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents
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Virtual stress plays tricks on cells.

Alexander Loewer1

  • 1Department of Biology, Technical University Darmstadt, Darmstadt, Germany.

Cell Systems
|July 20, 2023
PubMed
Summary
This summary is machine-generated.

Optogenetics allows virtual stress induction, separating stress signals from cell damage. This research offers new insights into the integrated stress response and cellular stress memory mechanisms.

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Last Updated: Jul 22, 2025

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • The integrated stress response (ISR) is crucial for cellular homeostasis.
  • Understanding the precise signaling pathways and consequences of stress is vital.
  • Distinguishing stress signaling from cellular damage has been challenging.

Purpose of the Study:

  • To investigate the dynamics of the integrated stress response using optogenetics.
  • To elucidate the mechanisms by which cells form memories of past stress events.
  • To separate stress signaling from direct cellular damage.

Main Methods:

  • Utilized optogenetics to induce virtual stress in cellular models.
  • Monitored stress signaling pathways independently of cellular damage.
  • Analyzed the formation and recall of cellular stress memories.

Main Results:

  • Optogenetics successfully induced virtual stress, decoupling signaling from damage.
  • New insights into the temporal dynamics of the integrated stress response were gained.
  • Mechanisms underlying cellular memory of stress were identified.

Conclusions:

  • Virtual stress induction via optogenetics is a powerful tool for studying stress responses.
  • Cellular stress memory plays a role in modulating responses to subsequent acute stress.
  • This approach advances our understanding of stress adaptation and resilience.