Urban Environmental Factors and Childhood Asthma
The purpose of this study is to determine the way environmental factors (like the components of inner-city household dust) affect immune system development and symptoms of asthma in inner city children. The study is divided into three periods, as the subjects age from birth to 10 years old. Each age bracket will explore different objectives and endpoints.
Subjects age 0 to 3 years old:
- Environmental factors in the inner city adversely influence the development of the immune system to promote cytokine dysregulation, allergy, and recurrent wheezing by age 3.
- Children who have had a viral lower respiratory infection and have developed cytokine dysregulation by age 3 are at increased risk for the development of asthma by age 6.
Subjects age 4 to 7 years old:
- There is a unique pattern of immune development that is driven by specific urban exposures in early life, and this pattern of immune development is characterized by: 1) impairment of antiviral responses and 2) accentuation of Th2-like responses (e.g. cockroach-specific IL-13). The clinical effects of these changes in immune development are frequent virus-induced wheezing and allergic sensitization by 3-4 years of age, and these characteristics synergistically increase the risk of asthma at age 7 years.
Subjects age 7 to 10 years old:
- There are unique combinations of environmental exposures (cockroach allergens, indoor pollutants [ETS and NO2], lack of microbial exposure), and family characteristics (stress, genetic factors related to innate immunity) that synergistically promote asthma onset, persistence, and morbidity in urban neighborhoods. These exposures and characteristics influence immune expression and lung development during critical periods of growth, resulting in specific asthma phenotypes.
|Study Design:||Observational Model: Case Control
Time Perspective: Prospective
|Official Title:||Urban Environment and Childhood Asthma (URECA)|
- Development of wheezing [ Time Frame: 0 to 3 years of age ] [ Designated as safety issue: No ]Establish in inner city children the immunologic causes for the development of recurrent wheezing.
- Correlation of Immunologic Factors and Development of Asthma [ Time Frame: by 7 years of age ] [ Designated as safety issue: No ]Establish, in this cohort of inner-city children, the immunologic causes for the development of asthma at age 7
- Correlation of Risk Factors to Rapidly Evolving Asthma Phenotypes [ Time Frame: up to 10 years of age ] [ Designated as safety issue: No ]Fully define the rapidly evolving asthma phenotypes and further delineate the role of risk factors related to environmental exposure (e.g.; house dust levels found through home inspection), immune development, lung growth on the natural history of asthma and allergic diseases in urban minority children
Biospecimen Retention: Samples With DNA
- Sample of umbilical cord blood (mother)
- Maternal blood sample
- Blood and nasal mucus collection (infant through age 10 years)
- DNA sample of mother and child
- Urine sample
- Saliva sample
- Induced sputum sample
- Nasal epithelial cells sample
|Study Start Date:||January 2005|
|Estimated Study Completion Date:||March 2017|
|Estimated Primary Completion Date:||March 2017 (Final data collection date for primary outcome measure)|
Inner-city children with asthma
Children at high risk for developing allergic diseases and asthma, on the basis of a parental history of asthma, allergic rhinitis or atopic dermatitis, and residence in the inner city
|United States, Maryland|
|Johns Hopkins University|
|Baltimore, Maryland, United States, 21287|
|United States, Massachusetts|
|Boston University School of Medicine|
|Boston, Massachusetts, United States, 02118|
|United States, Missouri|
|Saint Louis Children's Hospital|
|Saint Louis, Missouri, United States, 63110|
|United States, New York|
|New York, New York, United States, 10029|
|United States, Wisconsin|
|University of Wisconsin- an administrative site|
|Madison, Wisconsin, United States, 53706|
|Principal Investigator:||Robert Wood, MD||Johns Hopkins University|
|Principal Investigator:||George T. O'Connor, MD, MS||Boston University|
|Principal Investigator:||Meyer Kattan, MD, CM||Columbia University School of Medicine|
|Principal Investigator:||Gordon Bloomberg, MD||Washington University School of Medicine|
|Principal Investigator:||James Gern, MD||University of Wisconsin, Madison|
|Principal Investigator:||Herman Mitchell, PhD||Rho Federal System Division, Inc.|