Author: Mack, Ethan A.; Kallal, Lara E.; Demers, Delia A.; Biron, Christine A.
Title: Type 1 Interferon Induction of Natural Killer Cell Gamma Interferon Production for Defense during Lymphocytic Choriomeningitis Virus Infection Document date: 2011_8_9
ID: qkwo747o_13
Snippet: The peritoneal IFN-⥠response promotes resistance to LCMV infection. After i.p. infection, LCMV was difficult to detect in lavage fluids at 20 and 24 h, but titers rapidly increased by 30 h and subsequently decreased (Fig. 6A) . To determine the physiologic relevance of the peritoneal IFN-⥠response, viral burdens were measured in samples collected from WT mice and mice rendered unresponsive to IFN-⥠as a result of genetic mutation of the I.....
Document: The peritoneal IFN-⥠response promotes resistance to LCMV infection. After i.p. infection, LCMV was difficult to detect in lavage fluids at 20 and 24 h, but titers rapidly increased by 30 h and subsequently decreased (Fig. 6A) . To determine the physiologic relevance of the peritoneal IFN-⥠response, viral burdens were measured in samples collected from WT mice and mice rendered unresponsive to IFN-⥠as a result of genetic mutation of the IFN-⥠receptor (IFN-â¥R Ϫ/Ϫ ) (25) . The IFN-â¥R-deficient mice had significant increases in LCMV titers of approximately 1 log at 30 h after infection (Fig. 6A) . Experiments evaluating the require- ment for NK cells demonstrated that in comparison to control antibody treatments, antibodies to NK1.1 depleted the following: (i) the NK cells from the PECs isolated from uninfected and infected mice (Fig. 6B) , (ii) the major population expressing intracellular IFN-⥠after infection (Fig. 6B) , and (iii) the levels of detectable IFN-⥠in lavage fluids collected at 30 h following challenge (Fig. 6C) . The effects were accompanied by proportional increases in viral titers (Fig. 6C ). Taken together, these studies demonstrate that the IFN-⥠responses have an impact on controlling the viral burden in the peritoneal cavity during LCMV infection and that NK cells are required for the optimal IFN-⥠response, and its effects.
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