The pathogenic bacteria Chlamydophila pneumoniae and Porphyromanas gingivalis induce chronic inflammation. Epidemiological studies in humans and mouse models support a role for C. pneumoniae and P. gingivalis in chronic inflammatory plaque accumulation. IHowever, how these pathogens induce and maintain chronic inflammation is not well defined. Proinflammatory cytokines including IL-1B , TNF, and IL-6 play a critical role in chronic inflammation. It is known that human inflammatory vascular plaque is associated with polymorphisms in the IL-1 receptor antagonist gene and that IL-1 plays a role in bacterial induced inflammatory vascular plaque accumulation in mice. IL-1B polymorphisms are also associated with P. gingivalis mediated human inflammatory periodontal disease. In this project we will test the following hypotheses: 1) The induction of IL-1B occurs via a defined mechanism in endothelial cells which leads to stimulation of functional responses in platelets and macrophages;and 2) IL-1 plays a critical role in chronic oral inflammatory bone loss and inflammatory plaque formation that is associated with P. gingivalis chronic infection via cell specific mechanisms. To test these hypotheses we propose the following Aims:
Aim 1. To define the mechanism by which 1L1-B is induced in response to P. gingivalis in mouse endothelial cells and how IL-1 B modulates platelet and macrophage function.
Aim 2. To define the role of lL-1 and cell specificity in expression in P. gingivalis induced oral inflammatory bone loss in a mouse model.
Aim 3. To define the role of IL-1 and cell specificitv in expression in P. gingivalis induced chronic inflammation and plaque accumulation in a mouse model. Project 4 together with Projects 1- 3 will define the role of specific innate immune signaling molecules in P. gingivalis and C. pneumoniae induced inflammatory responses in cells relevant to chronic inflammatory processes, will characterize the roles of these innate immune pathways in inflammatory processes in vivo and define cell specificitv in these responses.

Public Health Relevance

The significance of this work is that it will define new mechanisms and signaling pathways in immune cells which functionally and collectively contribute to inflammatory pathways and will provide new mouse models for future studies. Enhanced understanding of the roles of innate immune signaling pathways and functional responses will ultimately provide a promising avenue for novel therapies for chronic inflammatory disorders.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program Projects (P01)
Project #
5P01AI078894-04
Application #
8527678
Study Section
Special Emphasis Panel (ZAI1-PRJ-I)
Project Start
Project End
Budget Start
2013-08-01
Budget End
2014-07-31
Support Year
4
Fiscal Year
2013
Total Cost
$163,038
Indirect Cost
$12,513
Name
Boston University
Department
Type
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02118
Papadopoulos, G; Shaik-Dasthagirisaheb, Y B; Huang, N et al. (2016) Immunologic environment influences macrophage response to Porphyromonas gingivalis. Mol Oral Microbiol :
Shaik-Dasthagirisaheb, Yazdani B; Mekasha, Samrawit; He, Xianbao et al. (2016) Signaling events in pathogen-induced macrophage foam cell formation. Pathog Dis 74:
He, Xianbao; Liang, Yanmei; LaValley, Michael P et al. (2015) Comparative analysis of the growth and biological activity of a respiratory and atheroma isolate of Chlamydia pneumoniae reveals strain-dependent differences in inflammatory activity and innate immune evasion. BMC Microbiol 15:228
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Koupenova, Milka; Mick, Eric; Mikhalev, Ekaterina et al. (2015) Sex differences in platelet toll-like receptors and their association with cardiovascular risk factors. Arterioscler Thromb Vasc Biol 35:1030-7
Huang, N; Shaik-Dasthagirisaheb, Y B; LaValley, M P et al. (2015) Liver X receptors contribute to periodontal pathogen-elicited inflammation and oral bone loss. Mol Oral Microbiol 30:438-50
Shaik-Dasthagirisaheb, Y B; Huang, N; Weinberg, E O et al. (2015) Aging and contribution of MyD88 and TRIF to expression of TLR pathway-associated genes following stimulation with Porphyromonas gingivalis. J Periodontal Res 50:89-102
Shaik-Dasthagirisaheb, Yazdani B; Huang, Nasi; Gibson 3rd, Frank C (2014) Inflammatory response to Porphyromonas gingivalis partially requires interferon regulatory factor (IRF) 3. Innate Immun 20:312-9
Koupenova, Milka; Vitseva, Olga; MacKay, Christopher R et al. (2014) Platelet-TLR7 mediates host survival and platelet count during viral infection in the absence of platelet-dependent thrombosis. Blood 124:791-802
Kramer, Carolyn D; Weinberg, Ellen O; Gower, Adam C et al. (2014) Distinct gene signatures in aortic tissue from ApoE-/- mice exposed to pathogens or Western diet. BMC Genomics 15:1176

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