During the initial funding period for this proposal, we made substantial progress in developing novel model systems to identify the specific aspects of T cell homeostasis that are influenced by IFN-gamma. Strikingly, these studies reveal that IFN-gamma produced after infection is able to regulate the initial expansion of antigen-specific CD8 T cells, the contraction phase and the rate at which T cells acquire memory characteristics. These data underlie and support our overall hypothesis for the current proposal, that that IFN-gamma is a major regulator of T cell homeostasis after infection. In this proposal, we will employ the model systems we developed in the preceding funding period to address the cellular and molecular basis for IFN-gamma regulation of T cell contraction. In addition, we will extend our studies to address the cross- talk between IFN-alpha-beta receptor and IFN-gamma receptor signaling in regulating the expansion of CDS T cells after infection. Our long-term goal is to understand how IFN-gamma and other signaling molecules regulate specific aspects of T cell homeostasis, such that this information can be used to enhance the T cell response to vaccination. Improvements in vaccination will allow the most cost effectiveand widespread defense against infectious disease. We will address our long-term goal through the following specific aims:
Specific Aim 1. Determine the timing, source, quantity and cellular targets of IFN-gamma required to regulate CDST cell contraction.
Specific Aim 2. Determine if IFN-gamma regulates T cell contraction through p53 and/or IL-18 signaling.
Specific Aim 3. Determine the requirements for IFN-alpha-beta and IFN-gamma signaling in regulating CDS T cell expansion.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI050073-07
Application #
7334768
Study Section
Immunity and Host Defense Study Section (IHD)
Program Officer
Lapham, Cheryl K
Project Start
2001-07-01
Project End
2011-12-31
Budget Start
2008-01-01
Budget End
2008-12-31
Support Year
7
Fiscal Year
2008
Total Cost
$361,744
Indirect Cost
Name
University of Iowa
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
062761671
City
Iowa City
State
IA
Country
United States
Zip Code
52242
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Wirth, Thomas C; Harty, John T; Badovinac, Vladimir P (2010) Modulating numbers and phenotype of CD8+ T cells in secondary immune responses. Eur J Immunol 40:1916-26

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