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PMID |
Sentence |
1 |
11694524
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Interferon regulatory factor-1 (IRF-1), the activation of which is induced by dsRNA, viral infection, and IFN-gamma, regulates the expression of many antiviral proteins, including PKR, type I IFN, and iNOS.
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2 |
11694524
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In this study, we show that IRF-1 is not required for dsRNA + IFN-gamma-stimulated iNOS expression and nitric oxide production by mouse islets.
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3 |
11694524
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In contrast to islets, dsRNA + IFN-gamma fails to induce iNOS expression or nitric oxide production by macrophages isolated from IRF-1(-/-) mice; however, dsRNA + IFN-gamma induces similar levels of IL-1 release by macrophages isolated from both IRF-1(-/-) and IRF-1(+/+) mice.
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4 |
11694524
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These results indicate that IRF-1 is required for dsRNA + IFN-gamma-induced iNOS expression and nitric oxide production by mouse peritoneal macrophages but not by mouse islets.
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5 |
11694524
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These findings suggest that dsRNA + IFN-gamma stimulates iNOS expression by two distinct PKR-independent mechanisms; one that is IRF-1-dependent in macrophages and another that is IRF-1-independent in islets.
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6 |
12947309
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Cytokine-treated WT islets demonstrated an increase in IRF-1 and iNOS gene expression, inhibition of GSIR, increased rates of apoptosis, and increased gene transcription and protein release for IP-10 and MCP-1.
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7 |
12947309
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Cytokine-treated IRF-1(-/-) islets demonstrated relatively less iNOS gene expression, preserved GSIR, reduced rates of apoptosis, and a more marked increase in transcription for IP-10 and MCP-1 and in IP-10 protein release.
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8 |
18481951
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We demonstrated that the absence of STAT-1 from beta-cells completely protects against IFNgamma+IL-1beta- and IFNgamma+dsRNA-mediated beta-cell death in vitro, whereas absence of IRF-1 does not prevent cytokine-induced beta-cell apoptosis.
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9 |
18481951
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Transcription factors drive this dual role, with STAT-1 driving beta-cell destruction and IRF-1 possibly playing a role in up-regulation of protective pathways induced by IFNgamma.
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10 |
20980260
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Thus, STAT1 promotes apoptosis and inflammation, whereas IRF-1 down-regulates inflammatory mediators.
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11 |
20980260
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STAT1, but not IRF-1, mediates the cytokine-induced loss of the differentiated ?-cell phenotype, as indicated by decreased insulin, Pdx1, MafA, and Glut2.
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12 |
9754830
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In these cells IFN-gamma potentiation is mostly mediated by GAS and ISRE, suggesting a role for the IFN-gamma-induced transcription factors Stat1alpha (which binds GAS) and IRF-1 (which binds ISRE), which may cooperate with NF-kappaB induced by IL-1beta for iNOS activation.
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