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British Journal of Anaesthesia, Vol 80, Issue 5 649-654, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia

LABORATORY INVESTIGATIONS

Propofol and Intralipid interact with reactive oxygen species: a chemiluminescence study

A. T. Demiryurek, I. Cinel, S. Kahraman, M. Tecder-Unal, N. Gogus, U. Aypar and I. Kanzik
Department of Pharmacology, Faculty of Pharmacy, Gazi University, Ankara, Turkey; Department of Anaesthesiology and Reanimation, Numune Hospital, Ankara, Turkey; Department of Anaesthesiology and Reanimation, Medical School, Hacettepe University, Ankara, Turkey

We have studied the ability of propofol and Intralipid to inhibit reactive oxygen species generated either by stimulated human leucocytes or cell-free systems using luminol chemiluminescence. Human leucocytes were stimulated by a chemotactic peptide, FMLP 1 mumol litre-1, or by a phorbol ester, PMA (protein kinase C activator) 0.1 mumol litre-1. In cell-free experiments, superoxide-hydrogen peroxide, hypochlorous acid or hydroxyl radical-induced chemiluminescence responses were initiated by xanthine 0.1 mmol litre-1 with xanthine oxidase 10 mu. ml-1, NaOCl 70 mumol litre-1 and FeSO4 3 mumol litre-1, respectively. Propofol with Intralipid, and to a lesser degree Intralipid alone, produced a concentration-dependent reduction in chemiluminescence from stimulated leucocytes. Similar attenuations were also observed using propofol with Intralipid on xanthine with xanthine oxidase-, HOCl- and ferrous iron- induced chemiluminescence. However, Intralipid produced a reduction only at high concentrations. Intralipid produced marked decreases in ferrous iron-induced chemiluminescence. This study suggests that propofol had a direct scavenging activity against HOCl, superoxide- hydrogen peroxide and hydroxyl radical in the concentrations used. These direct scavenging effects may contribute to the effect of propofol on human leucocyte chemiluminescence.
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