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Antimicrobial Agents and Chemotherapy, January 2001, p. 44-47, Vol. 45, No. 1
0066-4804/01/$04.00+0 DOI: 10.1128/AAC.45.1.44-47.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Clarithromycin Inhibits NF-
B Activation in Human
Peripheral Blood Mononuclear Cells and Pulmonary Epithelial
Cells
Takashi
Ichiyama,*
Miki
Nishikawa,
Tomomi
Yoshitomi,
Shunji
Hasegawa,
Tomoyo
Matsubara,
Takashi
Hayashi, and
Susumu
Furukawa
Department of Pediatrics, Yamaguchi
University School of Medicine, Ube, Yamaguchi 755-8505, Japan
Received 7 June 2000/Returned for modification 11 August
2000/Accepted 2 October 2000
Macrolide antibiotics modulate the production of proinflammatory
cytokines in vivo and in vitro. Transcription of the genes for these
proinflammatory cytokines is regulated by nuclear factor
B
(NF-
B). We examined whether or not clarithromycin
inhibits the activation of NF-
B induced by tumor necrosis factor
alpha (TNF-
) or staphylococcal enterotoxin A (SEA) in human
monocytic U-937 cells, a T-cell line (Jurkat), a
pulmonary epithelial cell line (A549), and peripheral blood
mononuclear cells (PBMC). Flow cytometry revealed that clarithromycin
suppresses NF-
B activation induced by TNF-
in U-937 and Jurkat
cells in a concentration-related manner. Western blot analysis also
demonstrated that clarithromycin inhibits NF-
B activation induced by
TNF-
in U-937, Jurkat, and A549 cells and PBMC and by SEA in PBMC.
Western blot analysis of cytoplasmic extracts of A549 cells revealed
that this inhibition is not linked to preservation of expression of the
I
B
protein. The chloramphenicol acetyltransferase assay indicated
that NF-
B-dependent reporter gene expression is suppressed in U-937
cells pretreated with clarithromycin. These findings are
consistent with the idea that clarithromycin suppresses the production
of proinflammatory cytokines via inhibition of NF-
B activation.
*
Corresponding author. Mailing address: Department of
Pediatrics, Yamaguchi University School of Medicine, 1-1-1 Minamikogushi, Ube, Yamaguchi 755-8505, Japan. Phone: 81-836-22-2258. Fax: 81-836-22-2257. E-mail:
ichiyama{at}po.cc.yamaguchi-u.ac.jp.
Antimicrobial Agents and Chemotherapy, January 2001, p. 44-47, Vol. 45, No. 1
0066-4804/01/$04.00+0 DOI: 10.1128/AAC.45.1.44-47.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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