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Virology. 2001 Feb 15;280(2):273-82.
Analysis of functional domains of interferon regulatory factor 7 and its association with IRF-3.

Au WC, Yeow WS, Pitha PM.

Oncology Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA.

IRF-7 plays an essential role in virus-activated transcription of IFNA genes. To analyze functional domains of IRF-7 we have constructed an amino-terminal deletion mutant of IRF-7 (237-514) which exerted a dominant negative (DN) effect on virus-induced expression of the endogenous Type I IFN genes. Focusing on the molecular mechanism underlying the dominant negative effect of IRF-7 DN, we found that virus-activated transcription of endogenous IFNA genes requires full-length IRF-7 and that Serine 483 and 484 play an essential role. While IRF-7 DN had no effect on virus-stimulated nuclear translocation of IRF-3 and IRF-7, the binding of IRF-7 DN to IRF-3 and IRF-7 was detected by GST pull-down assay as well as by immunoprecipitation in infected cells, indicating that IRF-7 DN targets both IRF-7 and IRF-3. The region by which IRF-7 interacts with IRF-3 was mapped between amino acid 418 and 473. Overexpression of IRF-7 DN in virus-infected 2FTGH cells resulted in an inhibition of IFN synthesis and in a significant reduction of binding of both IRF-3 and IRF-7 to the IFNA1 promoter. Interestingly, the IRF-7 DN-mediated suppression of IFNA gene expression can be negated by overexpression of IRF-3. Altogether these results suggest that the IRF-3/IRF-7 complexes are biologically active and are involved in virus-activated transcription of endogenous IFNA genes. 2001 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11162841&dopt=Abstract

Lung Cancer. 2001 Jan;31(1):25-30.
An analysis of cytokine status in the serum and effusions of patients with tuberculous and lung cancer.

Chen YM, Yang WK, Whang-Peng J, Tsai CM, Perng RP.

Chest Department, Veterans General Hospital-Taipei, Shih-pai Road, Taipei 112, Taiwan, ROC. ymcheghtpe.gov.tw

The present study was designed to ascertain whether or not the pleural effusion and serum cytokine levels (granulocyte-macrophage colony-stimulating factor [GM-CSF], interleukin-10 [IL-10], and interferon-gamma [IFN gamma]) in lung cancer patients differ from tuberculous (TB) pleural effusion, in which a strong cellular immune reaction is found; and, whether cytokine levels are a prognostic factor in lung cancer patients with malignant effusion. A total of 202 lung cancer patients with malignant pleural effusion and 26 patients with TB pleural effusion were studied consecutively between 1995 and 1998. Serum and effusion cytokine levels were analyzed with ELISA assays. The results showed that pleural effusion GM-CSF and IL-10 levels were significantly higher than serum levels in both cancer and TB patients. Pleural effusion IFN gamma levels were significantly higher than serum levels in TB patients. IFN gamma levels in both pleural effusion and serum were significantly higher in TB patients than in those with cancer. No significant difference was found, between TB and cancer patients, in the serum or pleural effusion levels of either IL-10 or GM-CSF. The ratio of pleural effusion IFN gamma to serum IFN gamma, effusion IFN gamma to effusion IL-10, and effusion IL-10 to serum IL-10, were all significantly higher in TB than in cancer patients, suggesting a higher cellular activity and T-helper 1 (Th1) reaction in TB pleural effusion than in malignant effusions, which were predominantly Th2 type. Survival analysis showed no significant difference in lung cancer patients with different levels of these cytokines. It was concluded that lung cancer patients with malignant pleural effusion had poorer immune profiles than those with TB pleurisy, both locally and systemically; and the cytokine profiles were not prognostic factors for lung cancer patients with malignant pleural effusion.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11162863&dopt=Abstract

Infect Immun. 2003 May;71(5):2766-74.
Inhibition of gamma interferon decreases bacterial load in peritonitis by accelerating peritoneal fibrin deposition and tissue repair.

Qiu G, Gribbin E, Harrison K, Sinha N, Yin K.

Department of Cell Biology, University of Medicine and Dentistry, New Jersey-School of Osteopathic Medicine, Stratford, New Jersey 08084, USA.

Bowel perforation can lead to significant bacterial spillage, which may then cause septic peritonitis, characterized by a systemic inflammatory response and organ dysfunction. There are several reports that have shown that the development of peritoneal adhesions is dependent on inflammatory cytokine levels and that these adhesions can reduce bacterial spread, possibly by sealing off the cecum in the cecal ligation and puncture (CLP) model of septic peritonitis. There have not, however, been any studies that have utilized a strategy to accelerate tissue repair in order to seal off the injured cecum and reduce bacterial spread as well as ameliorate systemic inflammation. In the present study, we demonstrate that the administration of anti-gamma interferon (IFN-gamma) antibody (1.2 mg/kg of body weight, intravenously) accelerated tissue repair via increased fibrin deposition 12 and 24 h after CLP in rats. This increase in fibrin deposition was associated with peritoneal adhesion 24 h after CLP and a reduction in bacterial load compared to the bacterial load of rats given irrelevant antibody. Plasma fibrin levels, however, were not altered after IFN-gamma antibody administration, suggesting that the inhibition of IFN-gamma activity specifically increased fibrin deposition to the site of injury. Furthermore, plasma interleukin-6, used as a marker of systemic inflammatory response, was reduced in CLP rats given IFN-gamma antibody compared to that found in those given irrelevant antibody. These results suggest that the early inhibition of IFN-gamma activity in the CLP model is beneficial by accelerating fibrin deposition in cecal tissue to prevent bacterial spread and reduce the systemic inflammatory response. Importantly, increased fibrin deposition in the ceca was not associated with increased plasma fibrin whereas the latter may have detrimental effects associated with coagulation disorders.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12704151&dopt=Abstract

Jpn J Ophthalmol. 2001 Jan-Feb;45(1):13-21.
Differential effects of protein tyrosine kinase inhibitors on interferon-gamma-induction of major histocompatibility complex class II and intercellular adhesion molecule-1 expression in human corneal epithelial cells.

Iwata M, Suzuki Y, Imai Y, Ono Y, Sawa M.

Department of Ophthalmology, Nihon University School of Medicine, Tokyo, Japan.

PURPOSE: Interferon (IFN)-gamma induces major histocompatibility complex (MHC) class II and intercellular adhesion molecule-1 (ICAM-1) expression on human corneal epithelial (HCE) cells. So far, it has not been clarified whether both inductions by IFN-gamma use the same signal transduction pathway. Therefore, in the present study, we tried to determine the significance of the protein tyrosine kinase (PTK)-dependent signaling pathway in the induction of both MHC class II and ICAM-1 expression by IFN-gamma in cultured HCE cells. METHODS: Cultured HCE cells were treated with human recombinant IFN-gamma. The induction of protein tyrosine phosphorylation of proteins including PTKs, janus kinase (JAK)1, and JAK2, was examined by Western blotting and immunoprecipitation. The effects of treatment of HCE cells with specific PTK inhibitors on IFN-gamma-induction of MHC class II and ICAM-1 expression were examined by flow cytometry. RESULTS: IFN 1 (Interferon) induced tyrosine phosphorylation of multiple substrates, particularly that of 75,000; 90,000; 130,000; and 160,000 molecular weight proteins including JAK1 and JAK2 in cultured HCE cells. The PTK inhibitors, herbimycin A and genistein, inhibited tyrosine phosphorylation of those proteins. Also, these PTK inhibitors prevented IFN-gamma-induction of MHC class II synthesis and surface expression. However, neither herbimycin A nor genistein had any effect on IFN-gamma-induction of ICAM-1 expression. CONCLUSIONS: Tyrosine phosphorylation of proteins including JAK1 and JAK2 is essential for IFN-gamma-induction of MHC class II expression, but not critical for that of ICAM-1 expression in cultured HCE cells. In addition, it is suggested that the IFN-gamma-induction of MHC class II requires PTK activities not only in the primary JAK-signal transducers and activators of transcription (STAT) pathway but also in the subsequent pathway mediated by IFN-gamma-induced intermediate proteins.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11163041&dopt=Abstract

Jpn J Ophthalmol. 2001 Jan-Feb;45(1):46-52.
Suppression of experimental autoimmune uveoretinitis by dietary calorie restriction.

Abe T, Nakajima A, Satoh N, Ohkoshi M, Sakuragi S, Koizumi A.

Department of Ophthalmology, Akita University School of Medicine, Akita, Japan.

To investigate the inhibitory effect of dietary calorie restriction on experimental autoimmune uveoretinitis (EAU) in rats, and its mechanism.Lewis rats were maintained on a 50% calorie-restricted diet for 2 months or 6 months. The control group was maintained on a 90% ad libitum intake for the same length of time. Experimental autoimmune uveoretinitis was elicited in both groups by immunization with an inter-photoreceptor retinoid-binding protein or its peptide. Rats in both groups were examined clinically, histopathologically, and immunologically.The severity of EAU was milder in the restricted diet group than in the control group. In EAU rats, production of interferon-gamma (IFN-gamma) in eyes and of IFN-gamma and tumor necrosis factor-alpha in draining lymph node cells was significantly lower in the restricted diet group than in the control group.Our results indicate that a calorie-restricted diet suppresses the development of EAU. The suppressed Th1-dependent immunological response is one of the reasons for the mildness of EAU in the calorie-restricted diet group of rats.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11163045&dopt=Abstract

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