Mechanisms underlying the complex interrelationships of infection and graft survival during induction and maintenance of transplantation tolerance are not well understood. Our goal is to understand how infection blocks the induction of peripheral and central tolerance. We have developed several innovative technologies for identifying virus-immune T cells and determining their anti-viral and cross-reactive alloreactivity at the single cell level. We have also developed methods for 1) quantifying alloreactive T cells using a 'synchimera'model based on CD8+ TCR Tg mice, 2) identifying naive and effector alloreactive T cells by their rapid production of cytokines following alloantigen stimulation, and 3) quantifying in vivo CDS T cell effector function using an in vivo cytotoxicity assay. We will use these techniques with an exciting new technology for in vivo delivery of siRNA to block of CD40-CD154 interaction. These new technologies will allow us to test our overall hypothesis that induction of pro-inflammatory cytokines and IFNI is a fundamental mechanism by which innate immune activation modulates the induction of peripheral and central tolerance.
Specific Aim 1 is to determine mechanisms by which TLR ligation or virus infection modulates the induction of peripheral tolerance. We will test the hypothesis that innate immune activation by TLR agonists or virus infection abrogates the induction of peripheral tolerance through the production of pro-inflammatory cytokines and IFNI.
Specific Aim 2 is to determine mechanisms by which TLR ligation or virus infection modulates establishment of hematopoietic chimerism and central tolerance. We will test the hypothesis that the induction of peripheral and central tolerance involves multiple different but overlapping mechanisms. This project should reveal the mechanism(s) by which infection compromises the induction of peripheral and central transplantation tolerance. This Project will interact closely with Project 2 studying the maintenance of tolerance, and Project 3 studying how alloreactive CDS T cells die by apoptosis following costimulation blockade. These discoveries will be translated to human immune systems in Project 4 using both the Viral and Technology Core and Animal Core as critical resources for the accomplishment of our research goals

Public Health Relevance

As new drugs for prolonging graft survival in pafients are implemented in the clinic, the safety and efficacy of these new drugs in the face of environmental insults such as infections are not known. This work will identify how infection during transplantafion may affect the host immune system and ultimate fate of the graft.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program Projects (P01)
Project #
5P01AI046629-13
Application #
8473764
Study Section
Special Emphasis Panel (ZAI1-PTM-I)
Project Start
Project End
Budget Start
2013-06-01
Budget End
2014-05-31
Support Year
13
Fiscal Year
2013
Total Cost
$399,536
Indirect Cost
$141,564
Name
University of Massachusetts Medical School Worcester
Department
Type
DUNS #
603847393
City
Worcester
State
MA
Country
United States
Zip Code
01655
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