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Infection and Immunity, April 2001, p. 2270-2276, Vol. 69, No. 4
0019-9567/01/$04.00+0 DOI: 10.1128/IAI.69.4.2270-2276.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Micrococci and Peptidoglycan Activate
TLR2
MyD88
IRAK
TRAF
NIK
IKK
NF-
B Signal
Transduction Pathway That Induces Transcription of
Interleukin-8
Qiuling
Wang,1,
Roman
Dziarski,1
Carsten J.
Kirschning,2
Marta
Muzio,3 and
Dipika
Gupta1,*
Northwest Center for Medical Education,
Indiana University School of Medicine, Gary, Indiana
464081; Institute for Medical
Microbiology, Immunology and Hygiene, Technical University of
Munich, Munich, Germany2; and
Department of Immunology and Cell Biology, Mario Negri
Institute, I-20157 Milan, Italy3
Received 11 September 2000/Returned for modification 22 November
2000/Accepted 25 January 2001
This study was done to elucidate the signal transduction pathway of
interleukin-8 (IL-8) induction by gram-positive bacteria. Bacteria (micrococci) and peptidoglycan (PGN) induced transcription of
IL-8 in HEK293 cells expressing Toll-like receptor 2 (TLR2) and CD14
but not in those expressing TLR1 or TLR4. A mutation within the NF-
B
site in the IL-8 promoter abrogated transcriptional induction of IL-8
by the two stimulants. Dominant negative myeloid differentiation
protein (MyD88), IL-1 receptor-associated kinase (IRAK),
NF
B-inducing kinase (NIK), and I
B kinase (IKK) mutant forms
completely inhibited micrococcus- and PGN-induced activation of NF-
B
and expression of the gene for IL-8. Induction of NF-
B was partially
inhibited by dominant negative tumor necrosis factor receptor-associated kinase 6 (TRAF6) but not TRAF2, whereas
induction of IL-8 gene was partially inhibited by both TRAF6 and TRAF2. These data indicate that micrococci and PGN induce TLR2-dependent activation of the gene for IL-8 and that this activation requires MyD88, IRAK, NIK, IKK, and NF-
B and may also utilize TRAF6 and, to a
lesser extent, TRAF2.
*
Corresponding author. Mailing address: Northwest
Center for Medical Education, Indiana University School of
Medicine, 3400 Broadway, Gary, IN 46408. Phone: (219) 980-6557. Fax: (219) 980-6566. E-mail:
dgupta{at}meded.iun.indiana.edu.

Present address: Washington University School of Medicine, St.
Louis, MO
63110.
Infection and Immunity, April 2001, p. 2270-2276, Vol. 69, No. 4
0019-9567/01/$04.00+0 DOI: 10.1128/IAI.69.4.2270-2276.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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