Endotoxemia-induced inflammation and the effect on the human brain


ven den Boogaard, Mark, Ramakers, Bart P., van Alfen, Nens, ven der Werf, Sieberen P., Fick, Wilhelmina F., Hoedemaekers, Cornelia W., Verbeek, Marcel M., Schoonhoven, Lisette, van der Hoeven, Johannes G. and Pickkers, Peter (2010) Endotoxemia-induced inflammation and the effect on the human brain. Critical Care, 14, (3), R81-[9pp]. (doi:10.1186/cc9001). (PMID:20444270).

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Description/Abstract

Introduction: Effects of systemic inflammation on cerebral function are not clear, as both inflammation-induced encephalopathy as well as stress-hormone mediated alertness have been described.

Methods: Experimental endotoxemia (2 ng/kg Escherichia coli lipopolysaccharide [LPS]) was induced in 15 subjects, whereas 10 served as controls. Cytokines (TNF-α, IL-6, IL1-RA and IL-10), cortisol, brain specific proteins (BSP), electroencephalography (EEG) and cognitive function tests (CFTs) were determined.

Results: Following LPS infusion, circulating pro- and anti inflammatory cytokines, and cortisol increased (P < 0.0001). BSP changes stayed within the normal range, in which neuron specific enolase (NSE) and S100-β changed significantly. Except in one subject with a mild encephalopathic episode, without cognitive dysfunction, endotoxemia induced no clinically relevant EEG changes. Quantitative EEG analysis showed a higher state of alertness detected by changes in the central region, and peak frequency in the occipital region. Improved CFTs during endotoxemia was found to be due to a practice effect as CFTs improved to the same extent in the reference group. Cortisol significantly correlated with a higher state of alertness detected on the EEG. Increased IL-10 and the decreased NSE both correlated with improvement of working memory and with psychomotor speed capacity. No other significant correlations between cytokines, cortisol, EEG, CFT and BSP were found.

Conclusions: Short-term systemic inflammation does not provoke or explain the occurrence of septic encephalopathy, but primarily results in an inflammation-mediated increase in cortisol and alertness.

Item Type: Article
ISSNs: 1364-8535 (print)
1875-7081 (electronic)
Subjects: Q Science > QR Microbiology
R Medicine > R Medicine (General)
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions: Faculty of Health Sciences
ePrint ID: 339218
Date Deposited: 25 May 2012 10:34
Last Modified: 27 Mar 2014 20:22
URI: http://eprints.soton.ac.uk/id/eprint/339218

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