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Toxoplasma gondii GRA7-Induced TRAF6 Activation Contributes to Host Protective Immunity

Title
Toxoplasma gondii GRA7-Induced TRAF6 Activation Contributes to Host Protective Immunity
Author
양철수
Keywords
DENSE GRANULE PROTEIN; TOLL-LIKE RECEPTORS; DENDRITIC CELLS; TROPHOBLAST APOPTOSIS; ACUTE VIRULENCE; MICE; GRA7; INFECTION; RESPONSES; MACROPHAGES
Issue Date
2016-01
Publisher
AMER SOC MICROBIOLOGY
Citation
INFECTION AND IMMUNITY, v. 84, NO 1, Page. 339-350
Abstract
The intracellular parasite Toxoplasma gondii has unique dense granule antigens (GRAs) that are crucial for host infection. Emerging evidence suggests that GRA7 of T. gondii is a promising serodiagnostic marker and an effective toxoplasmosis vaccine candidate; however, little is known about the intracellular regulatory mechanisms involved in the GRA7-induced host responses. Here we show that GRA7-induced MyD88 signaling through the activation of TRAF6 and production of reactive oxygen species (ROS) is required for the induction of NF-kappa B-mediated proinflammatory responses by macrophages. GRA7 stimulation resulted in the rapid activation of mitogen-activated protein kinases and an early burst of ROS in macrophages in a MyD88-dependent manner. GRA7 induced a physical association between GRA7 and TRAF6 via MyD88. Remarkably, the C terminus of GRA7 (GRA7-V) was sufficient for interaction with and ubiquitination of the RING domain of TRAF6, which is capable of inflammatory cytokine production. Interestingly, the generation of ROS and TRAF6 activation are mutually dependent on GRA7/MyD88-mediated signaling in macrophages. Furthermore, mice immunized with GRA7-V showed markedly increased Th1 immune responses and protective efficacy against T. gondii infection. Collectively, these results provide novel insight into the crucial role of GRA7-TRAF6 signaling in innate immune responses.
URI
http://iai.asm.org/content/84/1/339http://hdl.handle.net/20.500.11754/31718
ISSN
0019-9567; 1098-5522
DOI
10.1128/IAI.00734-15
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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