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Stress-induced alteration of polymorphonuclear leukocyte function in rats
M R Shurin1, A Kusnecov, E Hamill
1Department of Pathology, University of Pittsburgh School of Medicine, Pennsylvania 15213-2582.
Brain, Behavior, and Immunity
|June 1, 1994
Summary
Repeated footshock stress in rats altered immune cell function. While phagocytic activity of polymorphonuclear leukocytes (PMN) increased, their bacterial killing ability decreased after three days of stress exposure.
Area of Science:
- Immunology
- Neuroscience
- Stress Physiology
Background:
- Stress impacts immune system function.
- Polymorphonuclear leukocytes (PMN) are critical for innate immunity.
- Understanding stress effects on PMN is crucial for immune health.
Purpose of the Study:
- To investigate stressor-induced alterations in rat polymorphonuclear leukocyte (PMN) function.
- To examine the effects of acute and repeated footshock stress on PMN phagocytosis and bacterial killing.
Main Methods:
- A laboratory rat model of footshock stress was employed.
- Peripheral blood PMN function was assessed by measuring bacterial ingestion and killing capabilities.
- Both single and repeated (3 consecutive days) stress sessions were evaluated.
Main Results:
- A single footshock stress session did not alter PMN phagocytic or killing functions.
- Repeated footshock stress significantly enhanced PMN phagocytic activity.
- Repeated footshock stress suppressed the ability of PMN to kill bacteria.
Conclusions:
- Repeated exposure to stressors can modulate innate immune cell functions.
- Stress can differentially affect PMN phagocytosis and bactericidal activity.
- This model demonstrates that stress-related immune alterations are possible and dependent on stressor duration.
