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• W147941307 abstract "Prior immunity to a related or unrelated pathogen greatly influences the host’s immune response to a subsequent infection and can cause a dramatic difference in disease course, a phenomenon known as heterologous immunity. Heterologous immunity can influence protective immunity, immunopathology and/or immune deviation of cytokine-producing T cell subsets. Examples of heterologous immunity have been well documented in mouse models, as well as during human infections. For example, prior immunity to lymphocytic choriomeningitis virus (LCMV) provides partial protection against vaccinia virus (VV), as LCMV-immune mice show reduced VV titers and increased survival upon lethal dose VV infection. Heterologous protection against VV challenge, as a result of LCMV immunity, is mediated by LCMV-specific CD4 and CD8 T cells, as transfer of LCMV-specific memory T cells can mediate this protective effect in naive mice. The recognition of a single TCR with more than one MHC-peptide complex is referred to as T cell cross-reactivity. A VV K b -restricted epitope a11r 198 was identified to be able to induce cross-reactive responses from LCMV-specific CD8 T cells. During VV infection, LCMV-specific memory T cells that are cross-reactive to VV epitopes produce IFN-γ early in VV infection. IFN-γ is essential for mediating the protection against VV in LCMV-immune mice, as this heterologous protection is absent in IFN-γR -/- and IFN-γ blocking antibody-treated LCMV-immune mice. In addition to protective immunity, cross-reactive LCMV-specific memory T cells and IFN-γ also induce an altered immunopathology during heterologous VV challenge. LCMV-immune mice show moderate to severe levels of inflammation of the fat tissue, known as panniculitis, in the visceral fat pads upon VV challenge. In humans, panniculitis is a painful condition, most commonly presenting as erythema nodosum. Erythema nodosum is a disease of unknown etiology with no known treatment. It may occur following intracellular bacterial and viral infections, and occasionally happens after vaccination with VV for smallpox. During infections there can be a delicate balance between the ability of immune responses to provide protective immunity, and the tendency to induce immunopathology. By using the mouse model of heterologous immunity between LCMV and VV, we tried to understand how the immunity to LCMV biased the balance between the protective immunity and immunopathology, and what effector molecules were responsible for the pathogenesis of panniculitis in this system. TNF is a pleiotropic cytokine, which is required for normal innate and adaptive immune responses. Its functions range from inducing proliferative responses including cell survival, to destructive responses such as promoting apoptosis and programmed necrosis. In response to inflammatory stimuli, activated macrophages/ monocytes produce large amounts of TNF, and upon activation, T cells, B cells and NK cells also produce TNF. In vitro and in vivo studies have shown that TNF in…" @default.
• W147941307 created "2016-06-24" @default.
• W147941307 creator A5034803009 @default.
• W147941307 date "2008-01-01" @default.
• W147941307 modified "2023-09-23" @default.
• W147941307 title "Role of TNF in Heterologous Immunity between Lymphocytic Choriomeningitis Virus and Vaccinia Virus: A Dissertation" @default.
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