Tumor necrosis factor (TNF)-related cytokines are critical for antiviral defense, and are important for maintaining immune homeostasis during chronic infection. Cytomegalovirus (CMV, a ?-herpesvirus) infection is normally subclinical despite inducing a robust immune response and establishing lifelong persistence/latency, causing acute disease only if host defenses are immature or compromised. CMV accomplishes this by employing many tactics that modulate host immunity, several which target the TNF-family. We have recently identified specific proteins in both human and mouse CMV (MCMV) that inhibit the TNF-related apoptosis inducing ligand (TRAIL) death receptors (UL141 and m166, respectively). A MCMV mutant lacking m166 (MCMV?m166) shows reduced early replication, suggesting TRAIL-mediated innate defenses are normally neutralized by m166 in vivo. In stark contrast, persistent replication of MCMV?m166 is enhanced, indicating that viral inhibition of TRAIL DR signaling may promote adaptive immune control of chronic infection. This hypothesis is supported by our results showing that TRAIL-R2-/- mice control MCMV persistence better than wild- type mice. Our identification of specific CMV proteins that inhibit TRAIL DR has revealed new roles for this TNF-related signaling pathway in regulating the early and later phases of a herpesvirus infection. In this proposal we will determine the mechanism(s) by which TRAIL DR signaling, and m166 inhibition of this pathway, function to regulate innate and adaptive immune control of MCMV infection. The fact that both mouse and human CMV encode specific proteins that restrict expression of the TRAIL DR strongly suggests this TNF-related cytokine system regulates CMV infection in humans, and consequently these studies will provide heuristic value.
Cytomegalovirus (CMV) is a herpesvirus that establishes a lifelong infection in the majority of humans, causing serious disease if the immune system is immature or out of balance. CMV inhibits many immune pathways, and we have identified viral proteins that block signaling by TRAIL, an important host molecule for fighting infection. The impact that CMV inhibition of TRAIL has on viral fitness, and how TRAIL regulates the immune response during CMV infection, are the focus of this proposal.
|Seelige, Ruth; Saddawi-Konefka, Robert; Adams, Nicholas M et al. (2018) Interleukin-17D and Nrf2 mediate initial innate immune cell recruitment and restrict MCMV infection. Sci Rep 8:13670|
|Picarda, Gaëlle; Benedict, Chris A (2018) Cytomegalovirus: Shape-Shifting the Immune System. J Immunol 200:3881-3889|
|Delpoux, Arnaud; Michelini, Rodrigo Hess; Verma, Shilpi et al. (2018) Continuous activity of Foxo1 is required to prevent anergy and maintain the memory state of CD8+ T cells. J Exp Med 215:575-594|
|Swanson, Karen V; Junkins, Robert D; Kurkjian, Cathryn J et al. (2017) A noncanonical function of cGAMP in inflammasome priming and activation. J Exp Med 214:3611-3626|
|Dufour, Florent; Rattier, Thibault; Shirley, Sarah et al. (2017) N-glycosylation of mouse TRAIL-R and human TRAIL-R1 enhances TRAIL-induced death. Cell Death Differ 24:500-510|
|Jackson, Sarah E; Redeker, Anke; Arens, Ramon et al. (2017) CMV immune evasion and manipulation of the immune system with aging. Geroscience 39:273-291|
|Lio, Chan-Wang J; McDonald, Bryan; Takahashi, Mariko et al. (2016) cGAS-STING Signaling Regulates Initial Innate Control of Cytomegalovirus Infection. J Virol 90:7789-97|
|Verma, Shilpi; Weiskopf, Daniela; Gupta, Ankan et al. (2016) Cytomegalovirus-Specific CD4 T Cells Are Cytolytic and Mediate Vaccine Protection. J Virol 90:650-8|
|Haynes, LaTeira D; Verma, Shilpi; McDonald, Bryan et al. (2015) Cardif (MAVS) Regulates the Maturation of NK Cells. J Immunol 195:2157-67|
|Stacey, Maria A; Marsden, Morgan; Pham N, Tu Anh et al. (2014) Neutrophils recruited by IL-22 in peripheral tissues function as TRAIL-dependent antiviral effectors against MCMV. Cell Host Microbe 15:471-83|
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