Abstract

In response to MCMV infection, NK cells undergo three distinct phases of proliferation: the non-specific phase mediated by pro-proliferative cytokines; the specific phase mediated by recognition of an MCMV-encoded protein by an NK cell activating receptor, Ly49H; and the resolution phase, whose mechanism is unknown. MCMV infection of RAG mice, which lack all adaptive immune cells, results in prolonged proliferation of NK cells despite similar viral titers compared to wildtype mice. Interestingly, there are different kinetics for Ly49H+ and Ly49H- NK cells. We have identified several additional markers that may distinguish NK cells that have been specifically activated through their receptor from those non-specifically activated by cytokines. Using mice that lack only one or two adaptive lymphocyte populations, we determined that and T cells have a redundant ability to resolve NK cell proliferation. An adoptive transfer system was developed to further probe the characteristics of T cells required for this process. Finally, we have observed a significant decrease in NK cell numbers coincident with the resolution of various NK cell effector functions (IFN production and proliferation), which suggests a role for apoptosis in the resolution of NK cell activation. The resolution of IFN production is associated with increased formation of active caspase 8, which appears to be dependent on signaling through TRAIL-R.

Committee Chair

Anthony R. French

Committee Members

Paul Allen, Marco Colonna, Todd Fehniger, John Russell,

Comments

Permanent URL: https://doi.org/10.7936/K7T72FQN

Degree

Doctor of Philosophy (PhD)

Author's Department

Biology & Biomedical Sciences (Immunology)

Author's School

Graduate School of Arts and Sciences

Document Type

Dissertation

Date of Award

Spring 5-15-2016

Language

English (en)

Author's ORCID

https://orcid.org/0000-0002-9447-3364

Download

Included in

Biology Commons

Share

COinS