Airway inflammation induced by various allergens, pollution, and infections is a major underlying cause of asthma, a disease with alarming increases in incidence and mortality in the western countries in the past two decades. We seek to understand the cellular and molecular basis for exacerbation of asthma. Our immediate goal is to investigate the mechanisms by which CD4+ T helper cells (Th) regulate differentiation of innate Th2-type effector cells. Both CD4+ Th 2 cells and Th2-type innate effector cells have been shown to play critical roles in causing allergic airway inflammation by producing interleukin (IL)-4, IL-5, IL-9, IL-13 and IL-25. However, the mechanisms by which CD4+ Th2 cells regulate innate Th2-type effector cells are unknown. We studied these mechanisms by using IL-4 reporter mice. We found that IL-4 plays an important role in the differentiation of Th2 cytokine-producing innate cells both in vivo and in vitro. Based on our preliminary findings, we hypothesize that IL-4 primes bone marrow progenitor cells into Th2-type innate effector cells via a GATAS-dependent mechanism, while IL-5 does so via TAT5/GATA1-dependent mechanisms. We propose three specific aims to test our hypothesis.
in Aim 1, we will determine whether CD4+Th2 effector cells coordinate with innate cells to generate Th2-type immunity through secretion of IL-4 and IL-5.
In Aim 2, we will determine whether IL-4 directs bone marrow progenitor cells to differentiate into innate Th2-type effector cells via a GATA3-dependent mechanism; and In Aim 3, we will determine whether IL-5 directs bone marrow progenitor cells to differentiate into Th2-type innate effector cells via a STAT5/GATA1-dependent mechanism. These studies will identify novel aspects of interaction between adaptive immunity and innate cells. For diseases such as allergic inflammation, asthma, parasitic infection, and other immune dysregulations, our findings could lead to more effective treatments.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI059170-04
Application #
7385057
Study Section
Special Emphasis Panel (ZRG1-IHD (01))
Program Officer
Sawyer, Richard T
Project Start
2005-07-01
Project End
2010-03-31
Budget Start
2008-04-01
Budget End
2009-03-31
Support Year
4
Fiscal Year
2008
Total Cost
$326,489
Indirect Cost
Name
National Jewish Health
Department
Type
DUNS #
076443019
City
Denver
State
CO
Country
United States
Zip Code
80206