Persistent asthma is often accompanied by airway remodeling that accounts for a disproportionate fraction of asthma morbidity and mortality. The epithelium is thought to play an integral role in airway remodeling linked to rhinovirus-induced asthma exacerbations and glucocorticoid resistance. Glucocorticoid-induced leucine zipper (GILZ) is a pluripotent endogenous anti-inflammatory protein that inhibits NF-KB, AP-1 and MAPK signaling and that is reduced in asthmatic epithelial cells. The overall hypothesis is that the extent of asthmatic remodeling is strongly influenced by the expression of GILZ in airway epithelial cells, and that therapeutic strategies to increase GILZ may prevent remodeling even in asthmatic patients with glucocorticoid resistance.
Three aims are proposed:
Aim #1 will address whether decreased expression of GILZ contribute to more severe asthma exacerbations and airway remodeling;
Aim #2 will address whether glucocorticoid resistance involves a failure of glucocorticoids to trans-activate GILZ mRNA expression;
and Aim #3 will address whether therapeutic strategies to increase GILZ via a non-glucocorticoid mechanism decrease airway inflammation and protect patients from asthma exacerbations and airway remodeling. The proposed work will heavily utilize human asthmatic subjects from the Asthma Clinical Core. The approach will start with the analysis of primary bronchial epithelial cells from either asthmatic (or normal) subjects who are challenged with relevant allergen or rhinovirus or asthmatic subjects who are glucocorticoid resistant (or sensitive), then seek mechanistic extensions using normal human airway epithelial cells and finally a unique mouse strain in which GILZ has been genetically deleted from airway epithelial cells. GILZ is an anti-inflammatory protein, and the data from these experiments will complement the pro-inflammatory data from the same samples in the other two projects in this program project. By the end of these studies, the importance of GILZ as rheostat for allergic airway inflammation will be defined, and its role in glucocorticoid resistance defined. The therapeutic potential of non-glucocorticoid based approaches to increase GILZ in airway epithelial cells will be assessed and provides the most important long-term goal of the project.

Public Health Relevance

Asthma exacerbations and glucocorticoid resistance have been linked to increased airway remodeling and also define severe asthma, which is responsible for an overwhelming percentage of both asthma costs and asthma morbidity. GILZ is likely to play an important role in both asthma exacerbations and glucocorticoid resistance. The studies to increase GILZ expression through novel interventions could provide an entirely new therapeutic direction to meet the challenges of severe asthma and airway remodeling.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program--Cooperative Agreements (U19)
Project #
5U19AI070535-10
Application #
8897958
Study Section
Special Emphasis Panel (ZAI1)
Project Start
Project End
Budget Start
2015-09-01
Budget End
2016-08-31
Support Year
10
Fiscal Year
2015
Total Cost
Indirect Cost
Name
University of California San Diego
Department
Type
DUNS #
804355790
City
La Jolla
State
CA
Country
United States
Zip Code
92093
Karta, Maya R; Rosenthal, Peter S; Beppu, Andrew et al. (2018) ?2 integrins rather than ?1 integrins mediate Alternaria-induced group 2 innate lymphoid cell trafficking to the lung. J Allergy Clin Immunol 141:329-338.e12
Mehta, A K; Doherty, T; Broide, D et al. (2018) Tumor necrosis factor family member LIGHT acts with IL-1? and TGF-? to promote airway remodeling during rhinovirus infection. Allergy 73:1415-1424
Doherty, Taylor A; Broide, David H (2018) Lipid regulation of group 2 innate lymphoid cell function: Moving beyond epithelial cytokines. J Allergy Clin Immunol 141:1587-1589
da Silva Antunes, Ricardo; Mehta, Amit K; Madge, Lisa et al. (2018) TNFSF14 (LIGHT) Exhibits Inflammatory Activities in Lung Fibroblasts Complementary to IL-13 and TGF-?. Front Immunol 9:576
Unno, Hirotoshi; Miller, Marina; Rosenthal, Peter et al. (2018) Activating transcription factor 6? (ATF6?) regulates airway hyperreactivity, smooth muscle proliferation, and contractility. J Allergy Clin Immunol 141:439-442.e4
Miller, Marina; Vuong, Christine; Garcia, Meghan Farrell et al. (2018) Does reduced zona pellucida binding protein 2 (ZPBP2) expression on chromosome 17q21 protect against asthma? J Allergy Clin Immunol 142:706-709.e4
Ordovas-Montanes, Jose; Dwyer, Daniel F; Nyquist, Sarah K et al. (2018) Allergic inflammatory memory in human respiratory epithelial progenitor cells. Nature 560:649-654
Herro, Rana; Shui, Jr-Wen; Zahner, Sonja et al. (2018) LIGHT-HVEM signaling in keratinocytes controls development of dermatitis. J Exp Med 215:415-422
Chen, Jun; Miller, Marina; Unno, Hirotoshi et al. (2018) Orosomucoid-like 3 (ORMDL3) upregulates airway smooth muscle proliferation, contraction, and Ca2+ oscillations in asthma. J Allergy Clin Immunol 142:207-218.e6
White, Andrew A; Doherty, Taylor A (2018) Role of group 2 innate lymphocytes in aspirin-exacerbated respiratory disease pathogenesis. Am J Rhinol Allergy 32:7-11

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