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Mediators of Inflammation
Volume 6, Issue 3, Pages 211-215
http://dx.doi.org/10.1080/09629359791703

Sequential release of TNFα and phospholipase A2 in a rat model of LPS-induced pleurisy

1Department of Experimental Pharmacology, University of Naples ]Federico II' Via D. Montesano 49, Naples 80131, Italy
2Institute of Pharmacology and Pharmacognosy, University of Palermo, Via Forlanini 1, Palermo 90134, Italy

Copyright © 1997 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The levels of extracellular phospholipase A2 (sPLA2) and TNFα, and cell accumulation were measured in the pleural washings obtained at different times following the induction of Escherichia coli lipopolysaccharide (LPS, 100 μg/cavity) pleurisy in rats. TNFα peaked at 2 hours (3036 ± 160.3 units/ml) and decreased thereafter. Conversely, levels of sPLA2 peaked at 48 hours (1.97 ± 0.64 ng/ml) and were increased further (14.02 ± 4.16 ng/ml) by pretreatment with anti-TNFα antibody. Cell accumulation was not affected by antibody pretreatment. These data indicate that the sPLA2 enzyme is involved in LPS-induced pleurisy. The enzyme seems not to be stimulated by TNFα which may be involved in the downregulation of sPLA2 in this model of inflammation.