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Updated: May 8, 2026

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents

Published on: December 2, 2015

Inflammation, heart disease, and depression.

Angelos Halaris¹

¹Department of Psychiatry & Behavioral Neuroscience, Loyola University Chicago Stritch School of Medicine, Maywood, IL 60153, USA. ahalaris@lumc.edu

Current Psychiatry Reports

|August 27, 2013

Summary

Cardiovascular disease and depression frequently co-occur, driven by shared pathways like inflammation and nervous system imbalance. Mental stress may initiate this link, impacting serotonin production and leading to neurotoxic metabolites.

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Area of Science:

Neuroscience
Cardiology
Psychiatry

Background:

Cardiovascular disease and depressive illness are globally prevalent and often co-morbid.
This co-morbidity is bidirectional, involving complex interactions between multiple physiological systems.

Purpose of the Study:

To elucidate the shared pathophysiological mechanisms underlying the co-morbidity of cardiovascular disease and depression.
To identify common instigators and pathways contributing to this dual health burden.

Main Methods:

Review of epidemiological studies and pathophysiological factors.
Analysis of the roles of the central and autonomic nervous systems, neuroendocrine, immune, vascular, and hematologic systems.
Examination of the impact of mental stress on inflammatory pathways and neurotransmitter metabolism.

Main Results:

Shared pathways include sympathetic/parasympathetic imbalance, HPA axis activation, immune dysregulation, and hypercoagulability.
Inflammation is a common factor in both cardiovascular pathology and depression, linked to endothelial dysfunction.
Mental stress may trigger sustained sympathetic overdrive and diminished vagal tone, promoting inflammation and altering tryptophan metabolism via the kynurenine pathway.

Conclusions:

Mental stress is a likely common instigator, leading to a pro-inflammatory state and altered neurotransmitter metabolism.
The kynurenine pathway is implicated in the neurotoxic consequences of stress and inflammation in this co-morbidity.
Understanding these shared mechanisms is crucial for developing integrated treatment strategies.