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Related Concept Videos

Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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...
Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
Physiological Foundation of Stress01:24

Physiological Foundation of Stress

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...
Psychological Responses to Stress01:20

Psychological Responses to Stress

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...
Introduction to Stress and Lifestyle01:27

Introduction to Stress and Lifestyle

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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Related Experiment Video

Updated: Jun 7, 2026

The Unpredictable Chronic Mild Stress Protocol for Inducing Anhedonia in Mice
07:13

The Unpredictable Chronic Mild Stress Protocol for Inducing Anhedonia in Mice

Published on: October 24, 2018

The aging stress response.

Marcia C Haigis1, Bruce A Yankner

  • 1Department of Pathology, Harvard Medical School, Boston, MA 02115, USA. marcia_haigis@hms.harvard.edu

Molecular Cell
|October 23, 2010
PubMed
Summary
This summary is machine-generated.

Aging results from a balance of damage and repair, influenced by declining stress response and repair pathways. Modulating conserved signaling pathways may extend lifespan and reduce age-related diseases.

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Area of Science:

  • Gerontology and cellular biology, focusing on molecular mechanisms of aging.

Background:

  • Aging involves a decline in cellular repair and stress response systems, including proteostasis, DNA repair, and mitochondrial function.
  • Conserved signaling pathways like insulin/IGF-1, TOR, and sirtuins regulate these critical cellular maintenance processes.
  • These pathways are crucial for maintaining homeostasis against internal and external stressors.

Purpose of the Study:

  • To explore the role of conserved signaling pathways in modulating cellular stress response and repair mechanisms during aging.
  • To investigate how interventions targeting these pathways can impact lifespan and age-related pathologies.

Main Methods:

  • Review and synthesis of existing research on aging, stress response, and signaling pathways in model organisms.
  • Systems biology approach to understand the coordinated action of insulin/IGF-1, TOR, and sirtuin pathways.

Main Results:

  • Declining stress response and repair pathways accelerate aging and age-related pathology.
  • Modulation of conserved signaling pathways shows potential to enhance these systems.
  • Studies in model organisms indicate increased lifespan and reduced pathology with pathway adjustments.

Conclusions:

  • The coordinated action of signaling pathways is vital for cellular and organismal homeostasis.
  • Targeting stress response signaling pathways offers a novel therapeutic strategy for age-related diseases.
  • Systems biology provides a framework for understanding and intervening in the aging process.