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J Biol Chem, Vol. 273, Issue 28, 17846-17851, July 10, 1998
From Novartis Pharma, CH-4002 Basel, Switzerland
Perregaux and Gabel (Perregaux, D., and Gabel,
C. A. (1994) J. Biol. Chem. 269, 15195-15203)
reported that potassium depletion of lipopolysaccharide-stimulated
mouse macrophages induced by the potassium ionophore, nigericin, leads
to the rapid release of mature interleukin-1
Increased Mature Interleukin-1
(IL-1
) Secretion from
THP-1 Cells Induced by Nigericin Is a Result of Activation of
p45 IL-1
-converting Enzyme Processing
(IL-1
). We have now
shown a similar phenomenon in lipopolysaccharide-stimulated human
monocytic leukemia THP-1 cells. Rapid secretion of mature, 17-kDa
IL-1
occurred, in the presence of nigericin (4-16
µM). No effects on the release of tumor necrosis
factor-
, IL-6, or proIL-1
were seen. Addition of the irreversible
interleukin-1
-converting enzyme (ICE) inhibitor, Z-Val-Ala-Asp-dichlorobenzoate, or a radicicol analog, inhibited nigericin-induced mature IL-1
release and activation of p45 ICE precursor. The radicicol analog itself did not inhibit ICE, but markedly, and very rapidly depleted intracellular levels of 31-kDa proIL-1
. By contrast, dexamethasone, cycloheximide, and the
Na+/H+ antiporter inhibitor,
5-(N-ethyl-N-isopropyl)amiloride, had no effect on nigericin-induced release of IL-1
. We have therefore shown
conclusively, for the first time, that nigericin-induced release of
IL-1
is dependent upon activation of p45 ICE processing. So far, the
mechanism by which reduced intracellular potassium ion concentration
triggers p45 ICE processing is not known, but further investigation in
this area could lead to the discovery of novel molecular targets
whereby control of IL-1
production might be effected.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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