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Infection and Immunity, February 2006, p. 1204-1214, Vol. 74, No. 2
0019-9567/06/$08.00+0     doi:10.1128/IAI.74.2.1204-1214.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Identification of Proteins Differentially Expressed in Human Monocytes Exposed to Porphyromonas gingivalis and Its Purified Components by High-Throughput Immunoblotting

Qingde Zhou{dagger} and Salomon Amar*

Department of Periodontology and Oral Biology, School of Dental Medicine, Boston University, Boston, Massachusetts 02118

Received 21 September 2005/ Returned for modification 21 October 2005/ Accepted 7 November 2005

To characterize the roles of Porphyromonas gingivalis and its components in disease processes, we investigated the cytokine profiles induced by live P. gingivalis, its lipopolysaccharide (LPS), and its major fimbrial protein, fimbrillin (FimA). A cytokine antibody array revealed that human monocyte-derived macrophages were induced to produce chemokines (e.g., monocyte chemoattractant protein 1, macrophage inflammatory protein 1ß [MIP-1ß], and MIP-3{alpha}) as early as 1 h after exposure to P. gingivalis, with production declining after 24 h of exposure. As expected, an extensive repertoire of inflammatory mediators increased subsequent to infection, most predominantly tumor necrosis factor alpha (TNF-{alpha}), interleukin 1ß (IL-1ß), IL-6, IL-10, and granulocyte-macrophage colony-stimulating factor. The induction of cytokines by P. gingivalis was not triggered simply by bacterial cell surface components, since purified P. gingivalis LPS and FimA induced similar patterns of cytokines, while the pattern of cytokines induced by live P. gingivalis was significantly different, indicating that the host defense system senses live bacteria differently than it does the cell surface components LPS and FimA. To further understand the mechanisms by which live P. gingivalis and its components exert their effects, we used a high-throughput immunoblot screening approach (Becton-Dickinson PowerBlot) to analyze intracellular proteins involved in P. gingivalis infection in human macrophages. Exposure of human macrophages to either live P. gingivalis, its LPS, or its FimA protein led to the up-regulation of 12, 8, and 10 proteins and the down-regulation of 15, 8, and 17 proteins, respectively. The expression of proteins involved in gene transcription (e.g., monocyte enhancer factor 2D [MEF2D], signal transducer and activator of transcription 1 [STAT1], STAT3, STAT6, and IL enhancer binding factors [ILF3]), of protein kinases (e.g., mitogen-activated protein kinase 3 [MAPK3], MAP3K8, double-stranded RNA-activated protein kinase [PRKR], and MAP2K4), and of proteins involved in immune responses (e.g., TNF super family member 6 [TNFSF6] and interferon-induced protein with tetratricopeptide repeat 4 [IFIT4]), apoptosis (e.g., genes associated with retinoid interferon-induced mortality 19 [GRIM19]), and other fundamental cellular processes (e.g., clathrin heavy-chain polypeptide, culreticulin, and Ras-associated protein RAB27A) was found to be modulated differentially by P. gingivalis, LPS, and FimA. These differential changes are interpreted as preferential signal pathway activation in host immune/inflammatory responses to P. gingivalis infection.

* Corresponding author. Mailing address: Department of Periodontology and Oral Biology, School of Dental Medicine, Boston University Medical Center, 700 Albany Street W-201E, Boston, MA 02118. Phone: (617) 638-4983. Fax: (617) 638-8549. E-mail: samar{at}bu.edu.

Editor: D. L. Burns

{dagger} Present address: The Pulmonary Center, School of Medicine, Boston University Medical Center, 15 Stoughton Street R-304, Boston, MA 02118.

Infection and Immunity, February 2006, p. 1204-1214, Vol. 74, No. 2
0019-9567/06/$08.00+0     doi:10.1128/IAI.74.2.1204-1214.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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