Induction of antimicrobial pathways during early-phase immune response to Salmonella spp. in murine macrophages: gamma interferon (IFN-g) and upregulation of IFN-gamma receptor alpha expression are required for NADPH phagocytic oxidase gp91-stimulated oxidative burst and control of virulent Salmonella spp.
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- Dr Neil Foster
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| Author(s) | | Foster N; Hulme SD; Barrow PA |
| Publication type | | Article |
| Journal | | Infection and Immunity |
| Year | | 2003 |
| Volume | | 71 |
| Issue | | 8 |
| Pages | | 4733-4741 |
| ISSN (print) | | 0019-9567 |
| ISSN (electronic) | | 1098-5522 |
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| Full text for this publication is not currently held within this repository. Alternative links are provided below where available. |
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| The effect of gamma interferon (IFN-{gamma}) on elevation of reactive oxygen species and the viability of virulent wild-type and avirulent mutants of Salmonella enterica serovar Typhimurium and S. enterica serovar Infantis was studied in a murine macrophage cell line (J774.2 cells). S. enterica serovar Typhimurium 14028 phoP and a rough lipopolysaccharide mutant of S. enterica serovar Infantis 1326/28 ({phi}r) (avirulent mutants) induced NADPH phagocytic oxidase gp91 (gp91phox) activity and a significant (P < 0.05) elevation of reactive oxygen species within 12 h without coculture with IFN-{gamma}. This coincided with reduced survival of S. enterica serovar Typhimurium14028 phoP or stasis of S. enterica serovar Infantis {phi}r. Fluorometric studies indicated that expression of IFN-{gamma} on infected J774.2 cells was not significantly (P > 0.05) elevated. However, studies with the virulent S. enterica serovar Typhimurium strains showed that a comparable level of control of bacterial numbers could only be achieved by coculture with IFN-{gamma}. This coincided with significant upregulation of IFN-{gamma} receptor alpha expression on the surface of J774.2 cells and was completely abolished by N-acetyl-L-cysteine captopril (an inhibitor of reactive oxygen species). Delay in reactive oxygen species induction due to a requirement for IFN-{gamma} and upregulation of IFN-{gamma} receptor alpha in macrophages infected with virulent salmonellae may result in greater dissemination of virulent salmonellae in host tissue. |
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| Publisher | | American Society for Microbiology |
| URL | | http://dx.doi.org/10.1128/IAI.71.8.4733-4741.2003 |
| DOI | | 10.1128/IAI.71.8.4733-4741.2003 |
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