Inflammatory Response to Porphyromonas Gingivalis Partially Requires Interferon Regulatory Factor (IRF) 3

Overview

Journal Innate Immun

Publisher Sage Publications

Specialties Allergy & Immunology
Microbiology

Date 2013 Jun 28

PMID 23803413

Citations 12

Authors

Yazdani B Shaik-Dasthagirisaheb

Nasi Huang

Frank C Gibson 3rd

Affiliations

Soon will be listed here.

Abstract

Innate immune activation with expression of pro-inflammatory molecules such as TNF-α is a hallmark of the chronic inflammation associated with periodontal disease (PD). Porphyromonas gingivalis, a bacterium associated with PD, engages TLRs and activates MyD88-dependent and TIR-domain-containing adapter-inducing IFN-β (TRIF)-dependent signaling pathways. IFN regulatory factor (IRF) 3 is activated in a TRIF-dependent manner and participates in production of cytokines such as TNF-α; however, little is known regarding IRF3 and the host response to PD pathogens. We speculated that IRF3 participates in the host inflammatory response to P. gingivalis. Our results show that bone marrow macrophages (MØ) from WT mice respond to P. gingivalis with activation and nuclear translocation of IRF3. Compared with WT, MØ from IRF3(-/-), TRIF(-/-), and TLR4(-/-) mice responded with reduced levels of TNF-α on P. gingivalis challenge. In addition, full expression of IL-6 and RANTES by MØ to P. gingivalis was dependent on IRF3. Lastly, employing MØ from IRF3(-/-) and IRF7(-/-) mice we observed a significant role for IRF3 and a modest role for IRF7 in the P. gingivalis-elicited TNF-α response. These studies identify a role for IRF3 in the inflammatory response by MØ to the periodontal pathogen P. gingivalis.

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