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Molecular and Cellular Biology, March 2000, p. 1692-1698, Vol. 20, No. 5
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Inhibition of I
B Kinase and I
B
Phosphorylation by 15-Deoxy-
12,14-Prostaglandin
J2 in Activated Murine Macrophages
Antonio
Castrillo,
María
J. M.
Díaz-Guerra,
Sonsoles
Hortelano,
Paloma
Martín-Sanz, and
Lisardo
Boscá*
Instituto de Bioquímica (Centro Mixto
CSIC-UCM), Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
Received 3 June 1999/Returned for modification 23 July
1999/Accepted 24 November 1999
Activation of the macrophage cell line RAW 264.7 with
lipopolysaccharide (LPS) and gamma interferon (IFN-
) induces the
expression of gene products involved in host defense, among them type 2 nitric oxide synthase. Treatment of cells with
15-deoxy-
12,14-prostaglandin J2
(15dPGJ2) inhibited the LPS- and IFN-
-dependent synthesis of NO, a process that was not antagonized by similar concentrations of prostaglandin J2, prostaglandin
E2, or rosiglitazone, a peroxisomal proliferator-activated
receptor
ligand. Incubation of activated macrophages with
15dPGJ2 inhibited the degradation of I
B
and I
B
and increased their levels in the nuclei. NF-
B activity, as well as
the transcription of NF-
B-dependent genes, such as those encoding
type 2 nitric oxide synthase and cyclooxygenase 2, was impaired under
these conditions. Analysis of the steps leading to I
B
phosphorylation showed an inhibition of I
B kinase by
15dPGJ2 in cells treated with LPS and IFN-
, resulting in
an impaired phosphorylation of I
B
, at least in the serine 32 residue required for targeting and degradation of this protein.
Incubation of partially purified activated I
B kinase with 2 µM
15dPGJ2 reduced by 83% the phosphorylation in serine 32 of
I
B
, suggesting that this prostaglandin exerts direct inhibitory
effects on the activity of the I
B kinase complex. These results show
rapid actions of 15dPGJ2, independent of peroxisomal
proliferator receptor
activation, in macrophages challenged with
low doses of LPS and IFN-
.
*
Corresponding author. Mailing address: Instituto de
Bioquímica, Facultad de Farmacia, 28040 Madrid, Spain. Fax:
3491 543 8649 or 3491 394 1782. E-mail:
boscal{at}eucmax.sim.ucm.es.
Molecular and Cellular Biology, March 2000, p. 1692-1698, Vol. 20, No. 5
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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