Lung-associated antigen presenting cells (APCs) detect innumerable toxins that enter the distal airspaces with each breath. Whether they quell or incite inflammation upon acute sensing of pollutants could be of important consequence. Specifically ineffective APC function results in immune tolerance, chronic infections, or cancer, whereas aberrant processing of antigen can induce autoimmunity. We have demonstrated that a subtype of smokers who develop emphysema harbor autoimmune inflammation, characterized by the presence of elastin- specific T helper type 1 (Th1) and Th17 cells. Antigen specific T cells induce matrix metalloproteinase (MMP) 12 secretion in the lung that inhibits alpha 1 anti-trypsin (A1AT), thereby unleashing the activity of neutrophil elastase that cleaves elastin and weakens lung parenchyma. However, the immune events leading to the activation of Th1 and Th17 cells and emphysema through cigarette smoke remain obscure. Further, even among smokers, there exists large phenotypic variability suggesting that modifier genes and environmental exposures together exert a combined effect. We have found that lung APCs isolated from mice with emphysema can induce inflammatory cytokines, and cause emphysema when transferred to na?ve mice. Gene microarray analysis of lung APCs and our additional preliminary data suggest the presence of a regulatory relationship between the aryl hydrocarbon receptor (AhR), osteopontin (SPP1), and peroxisome proliferator- activated receptor gamma (PPAR-?), an anti-inflammatory transcription factor. Therefore, we hypothesize that tobacco smoke induces Th1 and Th17 cells through unique innate and adaptive immune mechanisms operative in lung APCs. We propose using a preclinical model of emphysema to i) Determine the sentinel role of the aryl hydrocarbon receptor in APC-induced pathogenic T cell activation in emphysema, and to ii) Determine the role of PPAR-?-osteopontin in cigarette smoke-dependent APC maturation and pathogenic Th1 and Th17 cell differentiation. This application captures some of the critical initiation events in smoke-induced inflammation and applies this knowledge to explore new therapeutic options in emphysema.

Public Health Relevance

In this grant application we propose to test new hypotheses that are based on our recent findings to elucidate the upstream molecular pathways that are activated in lung APCs, and could induce a vicious cycle of chronic unrelenting inflammation found in the lungs of smokers with emphysema. Further, we will provide preclinical evidence for the effectiveness of a few selected anti-inflammatory molecules in prevention and/or treatment of emphysema.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL117181-02
Application #
8701133
Study Section
Lung Cellular, Molecular, and Immunobiology Study Section (LCMI)
Program Officer
Punturieri, Antonello
Project Start
2013-08-01
Project End
2017-06-30
Budget Start
2014-07-01
Budget End
2015-06-30
Support Year
2
Fiscal Year
2014
Total Cost
Indirect Cost
Name
Baylor College of Medicine
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
City
Houston
State
TX
Country
United States
Zip Code
77030
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