Related Experiment Video
Updated: May 24, 2026
07:13
The Unpredictable Chronic Mild Stress Protocol for Inducing Anhedonia in Mice
Published on: October 24, 2018
Aging and stress: past hypotheses, present approaches and perspectives
1Department of Physiology, Faculty of Medicine, Universidad Complutense, 28040 Madrid, Spain.
Aging and Disease
|March 8, 2012
Summary
Excessive stress hormones can accelerate brain aging and impair cognitive functions. Positive environmental factors like exercise and learning can promote brain resilience and protect against stress-related damage.
Area of Science:
- Neuroscience
- Gerontology
- Endocrinology
Background:
- Brain aging is linked to excessive glucocorticoid secretion, damaging cognitive and emotional brain areas.
- The hypothalamic-pituitary adrenal (HPA) axis regulation is crucial in stress response and brain aging.
Purpose of the Study:
- To review hypotheses on the relationship between stress response dysregulation and brain aging.
- To explore molecular factors influencing aged brain vulnerability and resilience to stress.
Main Methods:
- Review of existing literature on stress, glucocorticoids, and brain aging.
- Focus on corticosterone, hippocampal, prefrontal cortex, and amygdala neurotransmission.
- Analysis of molecular mechanisms like heat shock proteins and epigenetic programming.
Main Results:
- Dysregulated stress response and excessive glucocorticoids contribute to unsuccessful brain aging.
- Genetic and early-life environmental factors (stress) increase vulnerability and reduce resilience.
- Molecular factors (e.g., corticosterone levels, downstream glucocorticoid receptor activation) influence brain vulnerability.
Conclusions:
- Positive environmental factors (cognitive tasks, exercise) enhance neuronal plasticity and protect the aging brain from stress.
- Environmental enrichment models and human studies suggest protective effects against stress-induced brain damage.
- Interventions promoting positive environments may mitigate unsuccessful brain aging.
Related Concept Videos
01:26Aging
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...
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...
01:20Psychological 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...
01:27Introduction 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...
01:23Stress Prevention and Stress Management Techniques II
Personality types, particularly Type A and Type B, significantly influence how individuals respond to stress. These personality distinctions are marked by varying levels of ambition, competitiveness, and coping styles, all of which shape an individual's resilience to stressors.
Type A Personality: Driven and Easily Stressed
Individuals with Type A personalities are often highly competitive and ambitious and operate with a strong sense of urgency. Commonly labeled as "workaholics," they...
Type A Personality: Driven and Easily Stressed
Individuals with Type A personalities are often highly competitive and ambitious and operate with a strong sense of urgency. Commonly labeled as "workaholics," they...
01:23Components of Stress
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 opposite to those on the...
Interestingly, the hidden cube faces also experience these stresses, equal and opposite to those on the...
01:04Applications of Stress
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...
The...