Hepatitis C virus (HCV) infection and HIV coinfection act synergistically to promote hepatic fibrosis and cirrhosis, but the underlying pathogenic mechanisms remain unclear due to a lack of appropriate animal models. The BalbC rag2/?C double knockout (DKO) mouse lacks T, B and NK cells and supports development of a functional human immune system in all lymphoid organs. To promote human liver cell co-engraftment, we introduced a liver-specific inducible suicidal transgene (AFC8) in the DKO mouse. Co-transplantation of human blood and liver progenitor cells in AFC8 mice leads to development of both human liver cells and immune cells in lymphoid/liver organs (AFC8-hu mice). These mice are permissive for HCV as well as HIV infection, support anti-viral human T cell responses, and develop human liver immunopathology (inflammation, hepatitis and fibrosis). I postulate that HIV co-infection may affect HCV-induced liver diseases by enhancing HCV replication;by elevating chronic hepatic inflammation;and by activating hepatic stellate cells to accelerate liver fibrosis. The AFC8-hu model is well suited for elucidating the mechanism underlying HCV/HIV synergy in human hepatic fibrosis in vivo. We propose the following aims: 1) The current AFC8-hu mouse will be improved to support higher human hepatocytes in the chimeric liver. In addition, HCV gt 1a and 2a clones will be tested to establish their infection and pathogenesis kinetics. 2) To study how HIV co-infection exacerbates HCV-induced liver fibrosis in AFC8-hu mice. We will define how HIV infection influences HCV infection, immunopathogenesis, stellate cell activation and liver fibrosis. In addition, the effectof HCV infection on HIV-1 replication and AIDS progression will also be monitored. 3) I propose that HIV coinfection dysregulates human inflammatory and immune responses to contribute to HCV-associated liver diseases. We will define the role of key HIV target cells pDC and Treg that promote HCV-induced liver stellate cell activation and fibrosis in vitro and in vivo. The novel AFC8-hu mouse is unique in providing a small animal model in which these important questions can be addressed. The answers to these questions will have a very significant impact on the field.

Public Health Relevance

The long-term goals of the project are to investigate the viral and immunologic mechanisms of HCV-mediated liver diseases enhanced by HIV coinfection and to model novel therapeutics in the novel AFC8-hu HSC/Hep model. The findings will establish the foundation for future study and shed light on novel therapeutic strategies. In this project, we will address the following specific questions related to HIV coinfection and HCV-induced liver fibrosis: (i) Does HIV enhance HCV replication to exacerbate liver fibrosis? (ii) How does HIV/HCV infection modulate human immune function in lymphoid/liver organs in vivo? (iii) What are the genomic and metabolomic signatures of human liver fibrosis induced by HCV, HIV, or both? (iv) What is the role of HIV target cells in such as human pDC and Treg cells in HCV-associated liver fibrosis? The novel AFC8-hu H/B mouse is unique in providing a small animal model in which these important questions can be addressed. The answers to these questions will have a very significant impact on the field.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI095097-03
Application #
8584278
Study Section
AIDS Immunology and Pathogenesis Study Section (AIP)
Program Officer
Sharma, Opendra K
Project Start
2011-12-01
Project End
2016-11-30
Budget Start
2013-12-01
Budget End
2014-11-30
Support Year
3
Fiscal Year
2014
Total Cost
$333,000
Indirect Cost
$108,000
Name
University of North Carolina Chapel Hill
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
608195277
City
Chapel Hill
State
NC
Country
United States
Zip Code
27599
Murphy, Christopher M; Xu, Yanping; Li, Feng et al. (2016) Hepatitis B Virus X Protein Promotes Degradation of SMC5/6 to Enhance HBV Replication. Cell Rep 16:2846-54
Zhu, Danming; Liu, Longchao; Yang, Dan et al. (2016) Clearing Persistent Extracellular Antigen of Hepatitis B Virus: An Immunomodulatory Strategy To Reverse Tolerance for an Effective Therapeutic Vaccination. J Immunol 196:3079-87
Zhang, Qianqian; Wang, Yang; Zhai, Naicui et al. (2016) HCV core protein inhibits polarization and activity of both M1 and M2 macrophages through the TLR2 signaling pathway. Sci Rep 6:36160
Li, Feng; Cheng, Liang; Murphy, Christopher M et al. (2016) Minicircle HBV cccDNA with a Gaussia luciferase reporter for investigating HBV cccDNA biology and developing cccDNA-targeting drugs. Sci Rep 6:36483
Reszka-Blanco, Natalia J; Sivaraman, Vijay; Zhang, Liguo et al. (2015) HIV-1 Env and Nef Cooperatively Contribute to Plasmacytoid Dendritic Cell Activation via CD4-Dependent Mechanisms. J Virol 89:7604-11
Guo, Hao; Zhang, Jialong; Zhang, Xuyuan et al. (2015) SCARB2/LIMP-2 Regulates IFN Production of Plasmacytoid Dendritic Cells by Mediating Endosomal Translocation of TLR9 and Nuclear Translocation of IRF7. J Immunol 194:4737-49
Cheng, Liang; Li, Feng; Bility, Moses T et al. (2015) Modeling hepatitis B virus infection, immunopathology and therapy in mice. Antiviral Res 121:1-8
Zhang, Zheng; Cheng, Liang; Zhao, Juanjuan et al. (2015) Plasmacytoid dendritic cells promote HIV-1-induced group 3 innate lymphoid cell depletion. J Clin Invest 125:3692-703
Wang, Yang; McGivern, David R; Cheng, Liang et al. (2015) Ribavirin Contributes to Hepatitis C Virus Suppression by Augmenting pDC Activation and Type 1 IFN Production. PLoS One 10:e0135232
Zhai, Naicui; Chi, Xiumei; Li, Tianyang et al. (2015) Hepatitis C virus core protein triggers expansion and activation of CD4(+)CD25(+) regulatory T cells in chronic hepatitis C patients. Cell Mol Immunol 12:743-9

Showing the most recent 10 out of 30 publications