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Infect Immun. 2003 May;71(5):2468-77.
Gamma interferon production by hepatic NK T cells during Escherichia coli infection is resistant to the inhibitory effects of oxidative stress.

Zhang G, Nichols RD, Taniguchi M, Nakayama T, Parmely MJ.

Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, KS 66160-7420, USA.

The reductive-oxidative status of tissues regulates the expression of many inflammatory genes that are induced during gram-negative bacterial infections. The cytokine gamma interferon (IFN-gamma) is a potent stimulus for host inflammatory gene expression, and oxidative stress has been shown to inhibit its production in mice challenged with Escherichia coli bacteria. The objective of the present study was to characterize the cells that produced IFN-gamma in a mouse bacterial peritonitis model and determine the effects of oxidative stress on their activation. The liver contained large numbers of IFN-gamma-expressing lymphocytes following challenge with viable E. coli bacteria. The surface phenotypes of IFN-gamma-expressing hepatic lymphocytes were those of natural killer (NK) cells (NK1.1(+) CD3(-)), conventional T cells (NK1.1(-) CD3(+)), and NK T cells (NK1.1(+) CD3(+)). Treating mice with diethyl maleate to deplete tissue thiols significantly impaired IFN-gamma production by NK cells, conventional T cells, and CD1d-restricted NK T cells in response to E. coli challenge. However, IFN-gamma expression by a subset of NK T cells, which did not bind alpha-galactosylceramide-CD1d tetramers, was resistant to the inhibitory effects of tissue oxidative stress. Stress-resistant IFN-gamma-expressing cells were also predominantly CD8(+) and bore gamma delta T-cell antigen receptors. The residual IFN-gamma response by NK T cells may explain previous reports of hepatic gene expression following gram-negative bacterial challenge in thiol-depleted mice. The finding also demonstrates that innate immune cells differ significantly in their responses to altered tissue redox status.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12704118&dopt=Abstract

FASEB J. 2001 Feb;15(2):383-92.
Regulation of monocyte chemoattractant protein (MCP)-1 transcription by interferon-gamma (IFN-gamma) in human astrocytoma cells: postinduction refractory state of the gene, governed by its upstream elements.

Zhou ZH, Han Y, Wei T, Aras S, Chaturvedi P, Tyler S, Rani MR, Ransohoff RM.

Department of Neurosciences, The Lerner Research Institute, and The Mellen Center for Multiple Sclerosis Treatment and Research, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.

Monocyte chemoattractant protein (MCP)-1 is expressed by astrocytes in diverse inflammatory states and is a key regulator of monocyte recruitment to the central nervous system (CNS). In the current study, we addressed mechanisms by which transcription of the human MCP-1 gene (hMCP-1) was terminated, after induction by interferon (IFN)-gamma. Our results demonstrated that IFN-gamma-induced transcription of hMCP-1 was followed by a refractory state, during which hMCP-1 was resistant to restimulation by either IFN-gamma or heterologous activators such as TNF-alpha. This refractory state affected the hMCP-1 gene selectively, as other IFN-gamma-inducible genes remained responsive to restimulation. The IFN-gamma-induced hMCP-1 refractory state was governed at the transcriptional level and was sensitive to protein synthesis inhibitors, suggesting a requirement for newly expressed components. A minimal 213 base pair hMCP-1 regulatory element directed both IFN-gamma-mediated transcription and the subsequent refractory state. We previously demonstrated that IFN-gamma treatment resulted in coordinate protein occupancy in vivo of two hMCP-1 promoter elements, a gamma-activated site (GAS) and a GC-rich element. During the refractory state, IFN-gamma treatment failed to induce protection of either the hMCP-1 GAS element or the GC box. These results furnish insight into the expression of hMCP-1 during CNS inflammation and provide the first delineation of an IFN-gamma-induced transcriptional refractory state.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11156954&dopt=Abstract

FASEB J. 2001 Feb;15(2):501-15.
Apoptosis is promoted by the dsRNA-activated factor (DRAF1) during viral infection independent of the action of interferon or p53.

Weaver BK, Ando O, Kumar KP, Reich NC.

Department of Pathology, State University of New York at Stony Brook, New York 11794, USA.

An apoptotic cellular defense mechanism is triggered in response to viral dsRNA generated during the course of infection by many DNA and RNA viruses. We demonstrate that apoptosis induced by dsRNA or a paramyxovirus is independent of the action of interferon as it can proceed in a variety of cell lines and primary cells deficient in an interferon response. Initiation of apoptosis appears to be triggered by activation of a cellular transcription factor, the dsRNA-activated factor (DRAF1). DRAF1 is composed of interferon regulatory factor 3 (IRF-3) and the transcriptional coactivators CREB binding protein (CBP) or p300. We find that activation of IRF-3 in the absence of viral infection stimulates apoptosis. In addition, a negative interfering mutant blocks both target gene induction and apoptosis, demonstrating a requirement for gene expression by IRF-3/DRAF1 to promote apoptosis. IRF-3/DRAF1 target gene expression is also induced in response to a distinct apoptotic stimulus, the DNA damaging agent etoposide. The activity of the p53 tumor suppressor does not appear to be required for IRF-3/DRAF1-mediated apoptosis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11156966&dopt=Abstract

FASEB J. 2001 Feb;15(2):535-44.
Delayed activation of PPARgamma by LPS and IFN-gamma attenuates the oxidative burst in macrophages.

Von Knethen A A, Brune B.

Department of Medicine IV-Experimental Division, University of Erlangen-Nurnberg, Faculty of Medicine, 91054 Erlangen, Germany.

Desensitization of macrophages is important during the development of sepsis. It was our intention to identify mechanisms that promote macrophage deactivation upon contact with endotoxin (LPS) and interferon-gamma (IFN-gamma) in vitro. Macrophage activation was achieved with 12-O-tetradecanoylphorbol 13-acetate (TPA), and the oxidative burst (i.e., oxygen radical formation) was followed by oxidation of the redox-sensitive dyes hydroethidine and dichlorodihydrofluorescein diacetate. Prestimulation of macrophages for 15 h with a combination of LPS/IFN-gamma attenuated oxygen radical formation in response to TPA. Taking the anti-inflammatory properties of the peroxisome proliferator-activating receptorgamma (PPARgamma) into consideration, we established activation of PPARgamma in response to LPS/IFN-gamma by an electrophoretic mobility shift, supershift, and a reporter gene assay. The reporter contains a triple PPAR-responsive element (PPRE) in front of a thymidine kinase minimal promoter driving the luciferase gene. We demonstrated that PPRE decoy oligonucleotides, supplied in front of LPS/IFN-gamma, allowed a full oxidative burst to recover upon TPA addition. Furthermore, we suppressed the oxidative burst by using the PPARgamma agonists 15-deoxy-Delta12,14-prostaglandin J2, BRL 49653, or ciglitazone. No effect was observed with WY 14643, a PPARalpha agonist. We conclude that activation of PPARs, most likely PPARgamma, promotes macrophage desensitization, thus attenuating the oxidative burst. This process appears important during development of sepsis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11156969&dopt=Abstract

J Clin Oncol. 2001 Feb 1;19(3):812-23.
Patient preferences for adjuvant interferon alfa-2b treatment.

Kilbridge KL, Weeks JC, Sober AJ, Haluska FG, Slingluff CL, Atkins MB, Sock DE, Kirkwood JM, Nease RF.

Department of Health Evaluation Sciences, University of Virginia Health System, Charlottesville, VA 22908-0821, USA. kk4irginia.edu

PURPOSE: Although trials of adjuvant interferon alfa-2b (IFN alpha-2b) in high-risk melanoma patients suggest improvement in disease-free survival, it is unclear whether treatment offers improvement in overall survival. Widespread use of adjuvant IFN alpha-2b has been tempered by its significant toxicity. To quantify the trade-offs between IFN alpha-2b toxicity and survival, we assessed patient utilities for health states associated with IFN therapy. Utilities are measures of preference for a particular health state on a scale of 0 (death) to 1 (perfect health). PATIENTS AND METHODS: We assessed utilities for health states associated with adjuvant IFN among 107 low-risk melanoma patients using the standard gamble technique. Health states described four IFN alpha-2b toxicity scenarios and the following three posttreatment outcomes: disease-free health and melanoma recurrence (with or without IFN alpha-2b) leading to cancer death. We also asked patients the improvement in 5-year disease-free survival they would require to tolerate IFN. RESULTS: Utilities for melanoma recurrence with or without IFN alpha-2b were significantly lower than utilities for all IFN alpha-2b toxicities but were not significantly different from each other. At least half of the patients were willing to tolerate mild-moderate and severe IFN alpha-2b toxicity for 4% and 10% improvements, respectively, in 5-year disease-free survival. CONCLUSION: On average, patients rate quality of life with melanoma recurrence much lower than even severe IFN alpha-2b toxicity. These results suggest that recurrence-free survival is highly valued by patients. The utilities measured in our study can be applied directly to quality-of-life determinations in clinical trials of adjuvant IFN alpha-2b to measure the net benefit of therapy.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157035&dopt=Abstract

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