Project 3, "Airway Biology of Acute Environmental Asthma in Humans" will examine the effect of environmental endotoxin on acute exacerbation of asthma. Epidemiological studies have shown that environmental particulate matter (PM) and endotoxin (a component of PM) are associated with increased occurrences of asthma exacerbation and wheeze. Published reports from our group and others demonstrate that endotoxin induce an innate response in the airway characterized by changes in monocyte/macrophage biology and influx of airway neutrophils. We have also shown that these responses correlate well to expression of CD14 on airway macrophages. Low levels of endotoxin prime the airway such that response of allergic asthmatics to allergens is enhanced, and lead to the general hypothesis that priming of the airway by pollutants via innate immune mechanisms to respond to additional pollutants or allergens is a central process by which environmental asthma is initiated. Though it is clear that environmental endotoxin induces asthma exacerbation, there is a significant gap in knowledge regarding the mechanisms which modulate inflammation due to this environmental irritant. Recent preliminary data from our group suggest that IL-1 (3 is an important modulator of endotoxin induced events in the airway. The recently discovered members of the CATERPILLER family of immune regulatory proteins play an important role in regulating IL-1p induced inflammation and we hypothesize that CATERPILLER genes are important in regulating pollutant induced asthma. Signals from pathogen associated molecular patterns entities (such as endotoxin) activate cryopyrin and NALP1, and induce the loss of the negative regulator protein monarch-1. In addition to being activated by PAMPs, cryopyrin is activated by endogenous ligands such as ATP (which is released by inflamed/injured airway cells) after ligation to the P2X7 receptor. Projects 1 and 2 focus on the role that these molecules have in mediating airway responses to LPS, differences in these responses observed between allergen sensitized and naTve mice, and the priming effect of endotoxin on response to allergen.
This aims of this project will be to examine the effect of allergen and endotoxin-induced inflammation on expression of CATERPILLAR regulators, P2X7 receptors and other molecules which enhance innate and immune response by airway monocytes, granulocytes and epithelial cells in allergic asthmatics, the modification of response to LPS by allergic inflammation, and the effect of anti-inflammatory therapy on these processes.
|Hernandez, Michelle L; Mills, Katherine; Almond, Martha et al. (2015) IL-1 receptor antagonist reduces endotoxin-induced airway inflammation in healthy volunteers. J Allergy Clin Immunol 135:379-85|
|Fry, Rebecca C; Rager, Julia E; Bauer, Rebecca et al. (2014) Air toxics and epigenetic effects: ozone altered microRNAs in the sputum of human subjects. Am J Physiol Lung Cell Mol Physiol 306:L1129-37|
|McConnell, Rob; Wu, Weidong; Berhane, Kiros et al. (2013) Inflammatory cytokine response to ambient particles varies due to field collection procedures. Am J Respir Cell Mol Biol 48:497-502|
|Pothlichet, Julien; Meunier, Isabelle; Davis, Beckley K et al. (2013) Type I IFN triggers RIG-I/TLR3/NLRP3-dependent inflammasome activation in influenza A virus infected cells. PLoS Pathog 9:e1003256|
|Wen, Haitao; Miao, Edward A; Ting, Jenny P-Y (2013) Mechanisms of NOD-like receptor-associated inflammasome activation. Immunity 39:432-41|
|Allen, Irving C; McElvania-TeKippe, Erin; Wilson, Justin E et al. (2013) Characterization of NLRP12 during the in vivo host immune response to Klebsiella pneumoniae and Mycobacterium tuberculosis. PLoS One 8:e60842|
|Roberts, Reid A; Shen, Tammy; Allen, Irving C et al. (2013) Analysis of the murine immune response to pulmonary delivery of precisely fabricated nano- and microscale particles. PLoS One 8:e62115|
|Brickey, Willie June (2013) Expression profiling to identify candidate genes associated with allergic phenotypes. Methods Mol Biol 1032:287-95|
|Hernandez, Michelle L; Wagner, James G; Kala, Aline et al. (2013) Vitamin E, ýý-tocopherol, reduces airway neutrophil recruitment after inhaled endotoxin challenge in rats and in healthy volunteers. Free Radic Biol Med 60:56-62|
|Brickey, Willie J; Neuringer, Isabel P; Walton, William et al. (2012) MyD88 provides a protective role in long-term radiation-induced lung injury. Int J Radiat Biol 88:335-47|
Showing the most recent 10 out of 37 publications