Intermittent but not continuous inescapable footshock stress affects immune responses and immunocyte beta-endorphin concentrations in the rat

Title

Intermittent but not continuous inescapable footshock stress affects immune responses and immunocyte beta-endorphin concentrations in the rat

Creator

Sacerdote P; Manfredi B; Bianchi M; Panerai AE

Publisher

Brain, Behavior, And Immunity

Date

1994

Subject

Male; Time Factors; Animals; Acute Disease; Rats; Comparative Study; Receptors; beta-Endorphin/analysis; Corticosterone/blood; Corticotropin-Releasing Hormone/antagonists & inhibitors; Corticotropin-Releasing Hormone/blood/pharmacology/physiology; Electroshock/adverse effects; Foot; Helplessness; Killer Cells; Learned; Lymphocyte Activation; Lymphoid Tissue/chemistry; Natural/immunology; Neuroimmunomodulation/physiology; Peptide Fragments/pharmacology; Spleen/immunology; Sprague-Dawley; Stress/etiology/immunology

Description

It is well known that a variety of stressors influence immune responses. The opioid peptide-beta-endorphin (BE) is deeply involved in stress responses, is synthesized in cells of the immune system, and participates in the modulation of immune function. We analyzed the ability of two different stress paradigms to modulate the beta-endorphin concentrations in the immune cells and the immune response in the rat. Two and 24 h after the exposure to inescapable intermittent footshock (1.6 mA, 60 Hz, 1 s, every 5 s for 20 min) the concentrations of beta-endorphin in splenocytes, peripheral blood mononuclear cells and lymph node cells were significantly increased. In contrast, the exposure to a continuous footshock for 3 min did not affect the concentrations of the opioid peptide. Similarly, phytohemoagglutinin-induced proliferation of splenocytes and natural killer activity were significantly impaired only after the exposure to intermittent footshock stress. On the contrary, plasma corticosterone levels were similarly elevated after both paradigms of stress. The pretreatment with the corticotropin-releasing hormone (CRH) receptor antagonist prevented both the stress-induced increase of immunocyte BE and immunosuppression. In conclusion, our data suggest that intermittent and continuous footshock stressors activate different neuroendocrine responses and that CRH plays a central role in mediating the immune effects of the intermittent footshock stress. The possible relationship between the beta-endorphin changes and immunosuppression is discussed.
1994

Rights

Article information provided for research and reference use only. PedPalASCNET does not hold any rights over the resource listed here. All rights are retained by the journal listed under publisher and/or the creator(s).

Type

Journal Article

Citation List Month

Backlog

Pages

251-260

Issue

3

Volume

8

Citation

Sacerdote P; Manfredi B; Bianchi M; Panerai AE, “Intermittent but not continuous inescapable footshock stress affects immune responses and immunocyte beta-endorphin concentrations in the rat,” Pediatric Palliative Care Library, accessed September 17, 2021, https://pedpalascnetlibrary.omeka.net/items/show/12323.

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