We propose the overarching hypothesis that liver non-parenchymal, antigen-presenting cells (ARC) serve as key regulators of hepatic-based inflammatory/immune responses. The proposed Program Project will bring together the collective expertise of a highly-experienced and interactive, interdisciplinary group of investigators, established in the study of APC function, hepatic ischemia-reperfusion (I/R) injury, liver immunobiology, and transplantation. Complementary skills and expertise of the team will be melded to elucidate mechanisms and resolve apparent paradoxes underlying the distinctive role of specific liver APC populations in innate immunity and regulation of adaptive immunity. There is strong potential for development of novel therapeutic strategies to improve liver allograft outcome. The Program's goal is to understand, through collaborative interaction, mechanisms underlying the role of specific liver APC, that generally dampen systemic immune responses to gut-derived Ags, in regulation of liver injury and hepatic immunity relevant to transplant outcome. Project 1 will focus on mechanisms by which the hepatocyte-derived transcription factor interferon regulatory factor-1 (IRF-1) and hepatocyte injury overwhelm the natural tendency of the liver to suppress inflammatory/immune responses after liver I/R injury.
Aim I : will identify the signaling pathways and role of liver APC (DCs, Kupffer cells and stellate cells) in regulation of hepatic IRF-1 expression;
Aim II : will elucidate the mechanisms of hepatic IRF-1-mediated liver injury;
Aim III : will determine whether IRF-1 blockade can ameliorate liver transplant I/R injury. Project 2 will focus on mechanisms that regulate liver DC maturation and function and determine their role in the initiation and regulation of T cell function and liver transplant outcome.
Aim I : will elucidate the role of inducible regulators of Toll-like receptor (TLR) signaling in endotoxin tolerance in liver DC;
Aim II : will ascertain the contribution of specific pro- and anti-inflammatory cytokines, expressed in the steady-state and during I/R injury, to endotoxin tolerance in liver DC.
Aim III : will establish the contribution of donor DC, TLR4 and negative regulators of TLR signaling in liver DC to T cell responses following experimental liver transplantation;
Aim I V: will determine the maturation status of hepatic DC, including expression of negative regulators of maturation, in relation to human liver transplant outcome. Project 3 will define mechanisms by which hepatic stellate cells participate in I/R injury and regulate the function of DC and T lymphocytes in relation to liver transplant outcome.
Aim I : will ascertain the influence of hepatic stellate cells on IRF-1 and liver I/R injury;
Aim II : will determine mechanisms underlying the regulation of DC and T lymphocyte function by hepatic stellate cells;
Aim III : will ascertain the role of hepatic stellate cells in the regulation of liver allograft outcome. These three Projects will be supported by an Administrative Core (Core A), that will co-ordinate programatic functions, an Imaging and Tissue Pathology Core (Core B). and a small animal Transplantation Surgery Core (Core C).

Public Health Relevance

The ultimate shared goal of these highly-integrated and interdependent Projects and Cores is to discover mechanisms that regulate the outcome of innate and adaptive immune responses affecting the liver, and that may provide new targets for therapeutic intervention in transplantation.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program Projects (P01)
Project #
5P01AI081678-02
Application #
7924006
Study Section
Special Emphasis Panel (ZAI1-SV-I (J1))
Program Officer
Kehn, Patricia J
Project Start
2009-09-01
Project End
2012-08-31
Budget Start
2010-09-01
Budget End
2012-08-31
Support Year
2
Fiscal Year
2010
Total Cost
$1,407,713
Indirect Cost
Name
University of Pittsburgh
Department
Surgery
Type
Schools of Medicine
DUNS #
004514360
City
Pittsburgh
State
PA
Country
United States
Zip Code
15213
Kumar, Sudhir; Wang, Jiang; Thomson, Angus W et al. (2017) Hepatic stellate cells increase the immunosuppressive function of natural Foxp3+ regulatory T cells via IDO-induced AhR activation. J Leukoc Biol 101:429-438
Yokota, Shinichiro; Yoshida, Osamu; Ono, Yoshihiro et al. (2016) Liver transplantation in the mouse: Insights into liver immunobiology, tissue injury, and allograft tolerance. Liver Transpl 22:536-46
Kimura, Shoko; Ozaki, Kikumi S; Ueki, Shinya et al. (2016) Contribution of alloantigens to hepatic ischemia/reperfusion injury: Roles of natural killer cells and innate immune recognition of nonself. Liver Transpl 22:80-90
Yokota, Shinichiro; Ueki, Shinya; Ono, Yoshihiro et al. (2016) Orthotopic mouse liver transplantation to study liver biology and allograft tolerance. Nat Protoc 11:1163-74
Dangi, Anil; Huang, Chao; Tandon, Ashish et al. (2016) Endotoxin-stimulated Rat Hepatic Stellate Cells Induce Autophagy in Hepatocytes as a Survival Mechanism. J Cell Physiol 231:94-105
Yoshida, Osamu; Dou, Lei; Kimura, Shoko et al. (2015) CD39 deficiency in murine liver allografts promotes inflammatory injury and immune-mediated rejection. Transpl Immunol 32:76-83
Gandhi, Chandrashekhar R; Chaillet, J Richard; Nalesnik, Michael A et al. (2015) Liver-specific deletion of augmenter of liver regeneration accelerates development of steatohepatitis and hepatocellular carcinoma in mice. Gastroenterology 148:379-391.e4
Yokota, Shinichiro; Yoshida, Osamu; Dou, Lei et al. (2015) IRF-1 promotes liver transplant ischemia/reperfusion injury via hepatocyte IL-15/IL-15R? production. J Immunol 194:6045-56
Nayar, Ribhu; Schutten, Elizabeth; Jangalwe, Sonal et al. (2015) IRF4 Regulates the Ratio of T-Bet to Eomesodermin in CD8+ T Cells Responding to Persistent LCMV Infection. PLoS One 10:e0144826
Rosborough, Brian R; Raïch-Regué, Dàlia; Turnquist, Heth R et al. (2014) Regulatory myeloid cells in transplantation. Transplantation 97:367-79

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