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Restraint stress is associated with changes in glucocorticoid immunoregulation.
M E Bauer1, P Perks, S L Lightman
1Department of Microbiology, Laboratory of Immunology, Pontifícia Universidade Católica do Rio Grande do Sul, Caixa Postal 1429, RS 90619-900, Porto Alegre, Brazil. mebauer@pucrs.br
Physiology & Behavior
|August 10, 2001
Summary
Acute stress impacts immune cells differently in the blood versus spleen. Chronic stress habituates these responses and increases spleen cell sensitivity to stress hormones.
Area of Science:
- Immunology
- Neuroendocrinology
- Stress Physiology
Background:
- Psychological stress activates the hypothalamic-pituitary-adrenal (HPA) axis and can impair cell-mediated immune (CMI) responses.
- Chronic intermittent stress may alter CMI responses differently across various immune compartments, but underlying mechanisms are unclear.
Purpose of the Study:
- Investigate acute and chronic restraint stress effects on rat peripheral blood lymphocyte (PBL) and splenocyte proliferation.
- Determine if stress-induced differential immune compartment effects relate to altered lymphocyte sensitivity to glucocorticoids.
Main Methods:
- Exposed Sprague-Dawley rats to acute or chronic intermittent restraint stress.
- Measured plasma corticosterone levels.
- Assessed phytohemagglutinin (PHA)-induced lymphocyte proliferation in PBL and splenocytes.
- Evaluated in vitro lymphocyte sensitivity to dexamethasone and corticosterone.
Main Results:
- Acute stress elevated corticosterone and increased splenocyte PHA response while suppressing PBL proliferation.
- Chronic stress attenuated the acute corticosterone rise and showed no significant changes in lymphocyte proliferation.
- Stressor re-exposure rapidly increased splenocyte sensitivity to glucocorticoids in chronically stressed rats.
Conclusions:
- Acute stress induces compartment-specific changes in CMI function.
- Chronic stress leads to habituated endocrine and immune responses.
- Stressor exposure rapidly modifies splenocyte sensitivity to glucocorticoids, potentially explaining differential immune effects.