The studies proposed in this grant are designed to provide new understanding of the role of both indoor allergen exposure and IgE antibodies specific for these proteins in relation to the prevalence and severity of asthma. Our recent investigation of a novel form of anaphylaxis identified IgE antibodies specific for the oligosaccharide galactose-?-1,3-galactose (alpha-gal) that are induced by tick bites. Those responses are common in the southeastern United States and are associated with delayed anaphylaxis following 3-4 hours after consumption of red meat. In keeping with that, the experiments proposed here take advantage of the fact that there are two allergens (alpha-gal and peanut) where sensitization appears to have become more common and which i) give rise to high titer IgE antibodies, ii) are thought to induce IgE antibodies by going through the skin, and iii) are not associated with asthma. Our central hypothesis is that IgE antibodies to protein antigens are an important contributor to asthma if they are chronically inhaled, and also that higher titers of these IgE antibodies increase that risk. The proposed experiments address several aspects of the problem from: I. Studies in developing or pre-hygiene regions, designed to understand why children in those countries do not have either high titer IgE antibodies to inhalant allergens or allergic asthma. These studies will include a comparison of home environments, allergic sensitization, clinical symptoms, and stool microbiome in Ecuador, Costa Rica, and Virginia. II. Studies within a Western post-hygiene environment focused on the evidence that different routes of exposure influence IgE antibody responses. These studies will investigate the effects of allergens on the skin in inducing Th2-related responses, with or without disruption of the skin barrier. The studies will also address the question whether changes in the skin due to excessive cleaning of infants could have contributed to the increase in IgE antibodies. III. We will use two different approaches to investigate the relevance of high titer IgE antibodies to understanding acute exacerbations of asthma. Those studies will first study children presenting with acute exacerbations to the hospital emergency room, and second, carry out RV challenges on adult subjects with asthma, using a new RV-16 pool. These studies will focus on the mechanisms by which Rhinovirus acts to cause exacerbation of allergic asthma. Taken together, the experiments proposed here have the potential to: i) explain the effects of high titer on prevalence and severity of asthma, ii) identify targets for treatment designed to reduce the severity of disease and the risk of exacerbations, and iii) provide information about why allergic diseases are continuing to increase in prevalence.

Public Health Relevance

Immediate hypersensitivity to common inhaled allergens is strongly associated with asthma in western countries. This form of sensitization can be quantified by measurement of serum IgE antibodies and recent evidence has shown that the risk of asthma is directly related to the titer of these antibodies. Identifying the factors that influence high titer IgE antibodies to different allergens with help, to identify children who are t risk, to explain how route of exposure influences IgE production, and to understand the mechanism by which high titers of IgE antibodies are related to acute exacerbations.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI020565-33
Application #
9245618
Study Section
Hypersensitivity, Autoimmune, and Immune-mediated Diseases Study Section (HAI)
Program Officer
Minnicozzi, Michael
Project Start
1984-07-01
Project End
2018-03-31
Budget Start
2017-04-01
Budget End
2018-03-31
Support Year
33
Fiscal Year
2017
Total Cost
$562,086
Indirect Cost
$205,346
Name
University of Virginia
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
065391526
City
Charlottesville
State
VA
Country
United States
Zip Code
22904
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Aalberse, Rob C; Platts-Mills, Thomas A; Rispens, Theo (2016) The Developmental History of IgE and IgG4 Antibodies in Relation to Atopy, Eosinophilic Esophagitis, and the Modified TH2 Response. Curr Allergy Asthma Rep 16:45
Platts-Mills, Thomas A E; Heymann, Peter W; Commins, Scott P et al. (2016) The discovery of IgE 50 years later. Ann Allergy Asthma Immunol 116:179-82
Erwin, Elizabeth A; Kruszewski, Patrice G; Russo, John M et al. (2016) IgE antibodies and response to cow's milk elimination diet in pediatric eosinophilic esophagitis. J Allergy Clin Immunol 138:625-628.e2

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