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Lipopolysaccharide Activates Caspase-1 (Interleukin-1-Converting Enzyme) in Cultured Monocytic and Endothelial Cells

Ralf R. Schumann, Claus Belka, Dirk Reuter, Norbert Lamping, Carsten J. Kirschning, Joerg R. Weber, and Dagmar Pfeil

From the Molecular Sepsis Research Laboratory, Max-Delbrück-Center for Molecular Medicine, the Institute of Microbiology and Hygiene, and the Department of Neurology, University Hospital Charité, Humboldt-University, Berlin, Germany; and the Department of Radiation Therapy, University of Tübingen, Tübingen, Germany.

Interleukin-1beta (IL-1beta ) is a pleiotropic proinflammatory cytokine. Mechanisms leading to its secretion include not only release of newly synthesized protein, but also cleavage of a preformed immature precursor protein into an active secretory form by the intracellular protease caspase-1 (formerly termed IL-1-converting enzyme [ICE]). Caspase-1 belongs to a rapidly growing family of cysteine proteases with substrate specificity for aspartate involved in cellular apoptosis. We have used an assay determining the caspase-1 activity based on cleavage of a fluorogenic peptide substrate to elucidate its role in lipopolysaccharide (LPS)-induced secretion of IL-1beta . We show that LPS induces moderate caspase-1 activity in the monocytic cell line THP-1, in freshly isolated peripheral blood monocytes, and in human umbilical vein endothelial cells (HUVECs) in a time- and dose-dependent fashion. Caspase-1 activation by LPS was associated with cleavage of the IL-1beta precursor protein that was followed by release of the mature IL-1beta protein in monocytic cells. In contrast, subsequent release of IL-1beta by HUVECs was not significant. LPS-induced caspase-1 activation appeared not to result from modulation of caspase-1 transcript accumulation and inhibition of caspase-1 activity was accomplished by two specific inhibitors, YVAD-CHO and YVAD-CMK, capable of alleviating the release of mature IL-1beta . Taken together, these results show that LPS moderately activates caspase-1 and that caspase-1 activation contributes to LPS induction of IL-1beta secretion.

Blood, Vol. 91 No. 2 (January 15), 1998: pp. 577-584
© 1998 by The American Society of Hematology.


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