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Infection and Immunity, March 2001, p. 1477-1482, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1477-1482.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Signaling by Toll-Like Receptor 2 and 4 Agonists Results in Differential Gene Expression in Murine Macrophages

Matthew Hirschfeld,1 Janis J. Weis,1 Vladimir Toshchakov,2 Cindy A. Salkowski,2 M. Joshua Cody,2 Dawn C. Ward,3 Nilofer Qureshi,4 Suzanne M. Michalek,3 and Stefanie N. Vogel2,*

Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah1; Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, Maryland2; Department of Microbiology, University of Alabama---Birmingham, Birmingham, Alabama3; and Department of Animal Health and Biomedical Sciences, University of Wisconsin at Madison, Madison, Wisconsin4

Received 14 November 2000/Accepted 7 December 2000

Lipopolysaccharide (LPS) derived from the periodontal pathogen Porphyromonas gingivalis has been reported to differ structurally and functionally from enterobacterial LPS. These studies demonstrate that in contrast to protein-free enterobacterial LPS, a similarly purified preparation of P. gingivalis LPS exhibited potent Toll-like receptor 2 (TLR2), rather than TLR4, agonist activity to elicit gene expression and cytokine secretion in murine macrophages and transfectants. More importantly, TLR2 stimulation by this P. gingivalis LPS preparation resulted in differential expression of a panel of genes that are normally induced in murine macrophages by Escherichia coli LPS. These data suggest that (i) P. gingivalis LPS does not signal through TLR4 and (ii) signaling through TLR2 and through TLR4 differs quantitatively and qualitatively. Our data support the hypothesis that the shared signaling pathways elicited by TLR2 and by TLR4 agonists must diverge in order to account for the distinct patterns of inflammatory gene expression.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, USUHS, 4301 Jones Bridge Road, Bethesda, MD 20814. Phone: (301) 295-3446. Fax: (301) 295-1545. E-mail: vogel{at}bob.usuhs.mil.

Infection and Immunity, March 2001, p. 1477-1482, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1477-1482.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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