Radiodetoxified Lipopolysaccharide Fails to Activate the Hypophyseal- Pituitary-Adrenal Axis in the Rat

Lipopolysaccharide (LPS) is known to raise the concentration of the circulating stress hormones such as ACTH, corticosterone and β-endorphin. This effect of endotoxin is mediated by different immune system-released hormone-like factors (e.g. interleukins, tumor necrosis factor etc.). Gamma-ray irrad...

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Bibliographic Details
Published in:Neuroimmunomodulation 2000-01, Vol.8 (3), p.128-131
Main Authors: Barna, I., Bertók, L., Koenig, J.I., Makara, G.B.
Format: Article
Language:English
Subjects:
Adrenocorticotropic Hormone - blood
Animals
beta-Endorphin - blood
Corticosterone - blood
Gamma Rays
Hypothalamo-Hypophyseal System - immunology
Lipopolysaccharides - immunology
Lipopolysaccharides - radiation effects
Male
Original Paper
Pituitary-Adrenal System - immunology
Rats
Rats, Wistar
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Summary:Lipopolysaccharide (LPS) is known to raise the concentration of the circulating stress hormones such as ACTH, corticosterone and β-endorphin. This effect of endotoxin is mediated by different immune system-released hormone-like factors (e.g. interleukins, tumor necrosis factor etc.). Gamma-ray irradiation of LPS alters its biological properties and results in a radiodetoxified LPS preparation with numerous beneficial effects and decreased toxicity. In this study we compared the neuroendocrine effects of a commercial LPS and our native and radiodetoxified LPS preparations in rats. Plasma ACTH, corticosterone and β-endorphin levels were measured by specific radioimmunoassays 120 min after intraperitoneal LPS administration. Control animals were injected with saline. Results show a dramatic increase in all hormones after administration of commercial and our native LPS preparation. Hormone levels in saline-injected controls and radiodetoxified LPS-treated rats did not rise significantly. These results suggest that radio-detoxification disintegrated that part of the LPS molecule complex which is responsible for toxicity including an enhanced production of cytokines, which trigger the hypothalamo-pituitary-adrenal axis.
ISSN:1021-7401
1423-0216
DOI:10.1159/000054272