The long-term objective of our work is to understand the in vivo regulation of natural killer (NK) cell proliferation and homeostasis during viral infections. NK cells are innate lymphocytes that participate in tumor surveillance and play a critical role in early anti-pathogen host defense. They are particularly important in host resistance to large DNA viruses, such as cytomegalovirus (CMV). Indeed, humans with selective NK cell deficiencies suffer from recurrent, often fatal, herpesvirus infections, includin CMV. NK cells are stimulated by cytokines elicited early during viral infections, as well as by direct recognition of infected cells through activation receptors. In C57BL/6 mice, the NK cell activation receptor that mediates resistance to murine cytomegalovirus (MCMV) is Ly49H. Ly49H recognition of its ligand on infected cells and subsequent signaling through its adaptor molecule DAP12 stimulates NK cell production of immunomodulatory cytokines and killing of infected cells. In addition to these effector functions, NK cells rapidly proliferate during viral infections. We have shown that the viral-induced proliferative response occurs in three distinct phases, including early nonspecific NK cell proliferation, preferential proliferation of NK cells tat are able to recognize infected cells, and cessation of proliferation with contraction of the expanded NK cell population. Furthermore, we have evidence that a and ?d T cells actively participate in the resolution of viral-induced NK cell proliferation. Although the basic regulationof progression through the cell cycle is well understood (e.g., the role of cell division cycle 25 [Cdc25] phosphatases in removing inhibitory phosphates from CDK/cyclin complexes), the mechanisms regulating NK cell proliferation and homeostasis remain poorly characterized. Building on observations made in the previous funding period, we propose to investigate the role of distinct Cdc25 phosphatases in facilitating non-specific and preferential NK cell proliferation during MCMV infection and to delineate the contributions of T cells and apoptosis to the resolution of viral-induced NK cell activation and proliferation. We contend that a clearer understanding of the in vivo regulation of NK cell proliferation during viral infections will have broad translational implications and may lead to novel therapeutic interventions to modulate NK cell responses to tumors and viruses.

Public Health Relevance

Our long-term objective is to understand the in vivo regulation of natural killer (NK) cell proliferation and homeostasis during viral infections. This proposal utilizes systemic infection with murine cytomegalovirus as a model system to investigate viral-induced NK cell proliferation. The findings from these studies will provide a more complete understanding of the regulation of NK cell proliferation with translational implications for interventions to modulate NK cell responses to tumors and viruses.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI078994-08
Application #
9263748
Study Section
Immunity and Host Defense (IHD)
Program Officer
Beisel, Christopher E
Project Start
2009-07-15
Project End
2020-04-30
Budget Start
2017-05-01
Budget End
2018-04-30
Support Year
8
Fiscal Year
2017
Total Cost
Indirect Cost
Name
Washington University
Department
Pediatrics
Type
Schools of Medicine
DUNS #
068552207
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
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Fotis, Lampros; Shaikh, Nurmohammad; Baszis, Kevin W et al. (2017) Serologic Evidence of Gut-driven Systemic Inflammation in Juvenile Idiopathic Arthritis. J Rheumatol 44:1624-1631
Mah, Annelise Y; Rashidi, Armin; Keppel, Molly P et al. (2017) Glycolytic requirement for NK cell cytotoxicity and cytomegalovirus control. JCI Insight 2:
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Sullivan, Ryan P; Fogel, Leslie A; Leong, Jeffrey W et al. (2013) MicroRNA-155 tunes both the threshold and extent of NK cell activation via targeting of multiple signaling pathways. J Immunol 191:5904-13
Sullivan, Ryan P; Leong, Jeffrey W; Schneider, Stephanie E et al. (2012) MicroRNA-deficient NK cells exhibit decreased survival but enhanced function. J Immunol 188:3019-30

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