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Abdelhafez M, Nasereddin A, Shamma OA, Abed R, Sinnokrot R, Marof O, Heif T, Erekat Z, Al-Jawabreh A, Ereqat S. Association of IFNAR2 rs2236757 and OAS3 rs10735079 Polymorphisms with Susceptibility to COVID-19 Infection and Severity in Palestine. Interdiscip Perspect Infect Dis 2023; 2023:9551163. [PMID: 37745867 PMCID: PMC10517872 DOI: 10.1155/2023/9551163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 08/04/2023] [Accepted: 09/08/2023] [Indexed: 09/26/2023] Open
Abstract
The clinical course and severity of COVID-19 vary among patients. This study aimed to investigate the potential correlation between the gene polymorphisms of the interferon receptor (IFNAR2) rs2236757 and oligoadenylate synthetase 3 (OAS3) rs10735079 with the risk of COVID-19 infection and its severity among Palestinian patients. The study was conducted between April and May 2021 on 154 participants who were divided into three groups: the control group (RT-PCR-negative, n = 52), the community cases group (RT-PCR-positive, n = 70), and the critically ill cases (ICU group; n = 32). The genotyping of the investigated polymorphisms was performed using amplicon-based next-generation sequencing. The genotypes distribution for the IFNAR2 rs2236757 was significantly different among the study groups (P = 0.001), while no statistically significant differences were found in the distribution of genotypes for the OAS3 rs10735079 (P = 0.091). Logistic regression analysis adjusted for possible confounding factors revealed a significant association between the risk allele rs2236757A and critical COVID-19 illness (P < 0.025). Among all patients, those who carried the rs2236757GA were more likely to have a sore throat (OR, 2.52 (95% CI 1.02-6.24); P = 0.011); the presence of the risk allele rs2236757A was associated with an increased risk to dyspnea (OR, 4.70 (95% CI 1.80-12.27); P < 0.001), while the rs10735079A carriers were less likely to develop muscle aches (OR, 0.34 (95% CI 0.13-0.88); P = 0.0248) and sore throat (OR, 0.17 (95% CI 0.05-0.55); P < 0.001). In conclusion, our results revealed that the rs2236757A variant was associated with critical COVID-19 illness and dyspnea, whereas the rs10735079A variant was protective for muscle aches and sore throat.
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Affiliation(s)
- Mohammad Abdelhafez
- Department of Internal Medicine, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
| | - Abedelmajeed Nasereddin
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
- Al-Quds Bard College, Al-Quds University, East Jerusalem, State of Palestine
| | - Omar Abu Shamma
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
| | - Rajaa Abed
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
| | - Raghida Sinnokrot
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
| | - Omar Marof
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
| | - Tariq Heif
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
| | - Zaid Erekat
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
| | - Amer Al-Jawabreh
- Department of Medical Laboratory Sciences, Faculty of Allied Health Sciences, Arab American University, Jenin, State of Palestine
| | - Suheir Ereqat
- Biochemistry and Molecular Biology Department, Faculty of Medicine, Al-Quds University, Abu Deis, East Jerusalem, State of Palestine
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Jakobi T, Groß J, Cyganek L, Doroudgar S. Transcriptional Effects of Candidate COVID-19 Treatments on Cardiac Myocytes. Front Cardiovasc Med 2022; 9:844441. [PMID: 35686037 PMCID: PMC9170897 DOI: 10.3389/fcvm.2022.844441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 03/03/2022] [Indexed: 11/13/2022] Open
Abstract
IntroductionSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) disease (COVID-19) has emerged as a major cause of morbidity and mortality worldwide, placing unprecedented pressure on healthcare. Cardiomyopathy is described in patients with severe COVID-19 and increasing evidence suggests that cardiovascular involvement portends a high mortality. To facilitate fast development of antiviral interventions, drugs initially developed to treat other diseases are currently being repurposed as COVID-19 treatments. While it has been shown that SARS-CoV-2 invades cells through the angiotensin-converting enzyme 2 receptor (ACE2), the effect of drugs currently repurposed to treat COVID-19 on the heart requires further investigation.MethodsHuman induced pluripotent stem cell-derived cardiac myocytes (hiPSC-CMs) were treated with five repurposed drugs (remdesivir, lopinavir/ritonavir, lopinavir/ritonavir/interferon beta (INF-β), hydroxychloroquine, and chloroquine) and compared with DMSO controls. Transcriptional profiling was performed to identify global changes in gene expression programs.ResultsRNA sequencing of hiPSC-CMs revealed significant changes in gene programs related to calcium handling and the endoplasmic reticulum stress response, most prominently for lopinavir/ritonavir and lopinavir/ritonavir/interferon-beta. The results of the differential gene expression analysis are available for interactive access at https://covid19drugs.jakobilab.org.ConclusionTranscriptional profiling in hiPSC-CMs treated with COVID-19 drugs identified unfavorable changes with lopinavir/ritonavir and lopinavir/ritonavir/INF-β in key cardiac gene programs that may negatively affect heart function.
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Affiliation(s)
- Tobias Jakobi
- Department of Internal Medicine and the Translational Cardiovascular Research Center, University of Arizona – College of Medicine – Phoenix, Phoenix, AZ, United States
- *Correspondence: Tobias Jakobi,
| | - Julia Groß
- Department of Cardiology, Angiology, and Pneumology, Heidelberg University Hospital, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
| | - Lukas Cyganek
- Stem Cell Unit, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Shirin Doroudgar
- Department of Internal Medicine and the Translational Cardiovascular Research Center, University of Arizona – College of Medicine – Phoenix, Phoenix, AZ, United States
- Shirin Doroudgar,
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Ohsugi T, Yamaguchi K, Zhu C, Ikenoue T, Takane K, Shinozaki M, Tsurita G, Yano H, Furukawa Y. Anti-apoptotic effect by the suppression of IRF1 as a downstream of Wnt/β-catenin signaling in colorectal cancer cells. Oncogene 2019; 38:6051-6064. [PMID: 31292489 DOI: 10.1038/s41388-019-0856-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Revised: 02/27/2019] [Accepted: 04/16/2019] [Indexed: 12/29/2022]
Abstract
Impaired Wnt signaling pathway plays a crucial role in the development of colorectal cancer through activation of the β-catenin/TCF7L2 complex. Although genes upregulated by Wnt/β-catenin signaling have been intensively studied, the roles of downregulated genes are poorly understood. Previously, we reported that interferon-induced proteins with tetratricopeptide repeats 2 (IFIT2) was downregulated by the Wnt/β-catenin signaling, and that the suppressed expression of IFIT2 conferred antiapoptotic property to colorectal cancer (CRC) cells. However, the mechanisms underlying how Wnt/β-catenin signaling regulates IFIT2 remain to be elucidated. In this study, we have uncovered that the expression of IFIT2 is induced by IRF1, which is negatively regulated by the Wnt/β-catenin signaling. In addition, we found that downregulation of IRF1 is mediated by its degradation through the ubiquitination-proteasome pathway, and that decreased activity of a deubiquitinase complex containing USP1 and UAF1 is involved in the degradation of IRF1 by Wnt/β-catenin signaling. These data should provide better understanding of the Wnt signaling pathway and human carcinogenesis.
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Affiliation(s)
- Tomoyuki Ohsugi
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan
| | - Kiyoshi Yamaguchi
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan
| | - Chi Zhu
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan
| | - Tsuneo Ikenoue
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan
| | - Kiyoko Takane
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan
| | - Masaru Shinozaki
- Department of Surgery, IMSUT Hospital, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan
| | - Giichiro Tsurita
- Department of Surgery, IMSUT Hospital, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan
| | - Hideaki Yano
- Department of Surgery, Center Hospital of the National Center for Global Health and Medicine, Tokyo, 162-8655, Japan
| | - Yoichi Furukawa
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, 108-8639, Japan.
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Dar AA, Pradhan TN, Kulkarni DP, Shah SU, Rao KV, Chaukar DA, D'Cruz AK, Chiplunkar SV. Extracellular 2'5'-oligoadenylate synthetase 2 mediates T-cell receptor CD3-ζ chain down-regulation via caspase-3 activation in oral cancer. Immunology 2015; 147:251-64. [PMID: 26595239 DOI: 10.1111/imm.12560] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 11/11/2015] [Accepted: 11/13/2015] [Indexed: 12/29/2022] Open
Abstract
Decreased expression of CD3-ζ chain, an adaptor protein associated with T-cell signalling, is well documented in patients with oral cancer, but the mechanistic justifications are fragmentary. Previous studies in patients with oral cancer have shown that decreased expression of CD3-ζ chain was associated with decreased responsiveness of T cells. Tumours are known to induce localized as well as systemic immune suppression. This study provides evidence that oral tumour-derived factors promote immune suppression by down-regulating CD3-ζ chain expression. 2'5'-Oligoadenylate synthetase 2 (OAS2) was identified by the proteomic approach and our results established a causative link between CD3-ζ chain down-regulation and OAS2 stimulation. The surrogate situation was established by over-expressing OAS2 in a HEK293 cell line and cell-free supernatant was collected. These supernatants when incubated with T cells resulted in down-regulation of CD3-ζ chain, which shows that the secreted OAS2 is capable of regulating CD3-ζ chain expression. Incubation of T cells with cell-free supernatants of oral tumours or recombinant human OAS2 (rh-OAS2) induced caspase-3 activation, which resulted in CD3-ζ chain down-regulation. Caspase-3 inhibition/down-regulation using pharmacological inhibitor or small interfering RNA restored down-regulated CD3-ζ chain expression in T cells induced by cell-free tumour supernatant or rh-OAS2. Collectively these results show that OAS2 leads to impairment in CD3-ζ chain expression, so offering an explanation that might be applicable to the CD3-ζ chain deficiency observed in cancer and diverse disease conditions.
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Affiliation(s)
- Asif A Dar
- Chiplunkar Laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Trupti N Pradhan
- Chiplunkar Laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Dakshayni P Kulkarni
- Chiplunkar Laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Sagar U Shah
- Chiplunkar Laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Kanury V Rao
- Immunology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | | | | | - Shubhada V Chiplunkar
- Chiplunkar Laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
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5
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Larsen S, Kawamoto S, Tanuma SI, Uchiumi F. The hematopoietic regulator, ELF-1, enhances the transcriptional response to Interferon-β of the OAS1 anti-viral gene. Sci Rep 2015; 5:17497. [PMID: 26643049 PMCID: PMC4672336 DOI: 10.1038/srep17497] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 10/30/2015] [Indexed: 12/11/2022] Open
Abstract
Interferon (IFN) therapy is effective in treating cancers, haematological and virus induced diseases. The classical Jak/Stat pathway of IFN signal transduction leading to changes in transcriptional activity is well established but alone does not explain the whole spectrum of cellular responses to IFN. Gene promoters contain cis-acting sequences that allow precise and contextual binding of transcription factors, which control gene expression. Using the transcriptional response to IFN as a starting point we report a high frequency of tandem GGAA motifs in the proximal promoters of Interferon stimulated genes, suggesting a key regulatory action. Utilizing the well-characterized anti-viral gene, OAS1, as an example Interferon stimulated gene promoter containing such a duplicated GGAA motif, we have demonstrated a regulatory role of this promoter in response to IFN by mutation analysis. Furthermore, we identified ELF-1 as a direct binding factor at this motif. Additionally, recruitment of RB1 and SP1 factors to the promoter following IFN stimulation is shown. ELF-1 overexpression enhanced and knockdown of ELF-1 inhibited full activation of OAS1 by IFN stimulation. Collectively, ELF-1 binds an important duplicated GGAA cis-acting element at the OAS1 promoter and in cooperation with RB1 and SP1 recruitment contributes to regulation in response to IFN stimulation.
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Affiliation(s)
- Steven Larsen
- Research Center for RNA Science, RIST, Tokyo University of Science, Noda, Chiba, Japan.,Department of Gene Regulation, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan
| | - Shota Kawamoto
- Department of Gene Regulation, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan
| | - Sei-ichi Tanuma
- Research Center for RNA Science, RIST, Tokyo University of Science, Noda, Chiba, Japan.,Department of Biochemistry, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan
| | - Fumiaki Uchiumi
- Research Center for RNA Science, RIST, Tokyo University of Science, Noda, Chiba, Japan.,Department of Gene Regulation, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan
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Ibsen MS, Gad HH, Andersen LL, Hornung V, Julkunen I, Sarkar SN, Hartmann R. Structural and functional analysis reveals that human OASL binds dsRNA to enhance RIG-I signaling. Nucleic Acids Res 2015; 43:5236-48. [PMID: 25925578 PMCID: PMC4446440 DOI: 10.1093/nar/gkv389] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 04/10/2015] [Accepted: 04/11/2015] [Indexed: 12/25/2022] Open
Abstract
The oligoadenylate synthetase (OAS) enzymes are cytoplasmic dsRNA sensors belonging to the antiviral innate immune system. Upon binding to viral dsRNA, the OAS enzymes synthesize 2'-5' linked oligoadenylates (2-5As) that initiate an RNA decay pathway to impair viral replication. The human OAS-like (OASL) protein, however, does not harbor the catalytic activity required for synthesizing 2-5As and differs from the other human OAS family members by having two C-terminal ubiquitin-like domains. In spite of its lack of enzymatic activity, human OASL possesses antiviral activity. It was recently demonstrated that the ubiquitin-like domains of OASL could substitute for K63-linked poly-ubiquitin and interact with the CARDs of RIG-I and thereby enhance RIG-I signaling. However, the role of the OAS-like domain of OASL remains unclear. Here we present the crystal structure of the OAS-like domain, which shows a striking similarity with activated OAS1. Furthermore, the structure of the OAS-like domain shows that OASL has a dsRNA binding groove. We demonstrate that the OAS-like domain can bind dsRNA and that mutating key residues in the dsRNA binding site is detrimental to the RIG-I signaling enhancement. Hence, binding to dsRNA is an important feature of OASL that is required for enhancing RIG-I signaling.
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Affiliation(s)
- Mikkel Søes Ibsen
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Hans Henrik Gad
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Line Lykke Andersen
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Veit Hornung
- Institute of Molecular Medicine, University Hospital, University of Bonn, Bonn 53127, Germany
| | - Ilkka Julkunen
- Department of Virology, University of Turku, 20520 Turku, Finland Viral Infections Unit, National Institute for Health and Welfare, 00300 Helsinki, Finland
| | - Saumendra N Sarkar
- Department of Microbiology and Molecular Genetics, University of Pittsburgh Cancer Institute, Pittsburgh, PA 15213, USA
| | - Rune Hartmann
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
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7
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Ibsen MS, Gad HH, Thavachelvam K, Boesen T, Desprès P, Hartmann R. The 2'-5'-oligoadenylate synthetase 3 enzyme potently synthesizes the 2'-5'-oligoadenylates required for RNase L activation. J Virol 2014; 88:14222-31. [PMID: 25275129 PMCID: PMC4249133 DOI: 10.1128/jvi.01763-14] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 09/23/2014] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED The members of the oligoadenylate synthetase (OAS) family of proteins are antiviral restriction factors that target a wide range of RNA and DNA viruses. They function as intracellular double-stranded RNA (dsRNA) sensors that, upon binding to dsRNA, undergo a conformational change and are activated to synthesize 2'-5'-linked oligoadenylates (2-5As). 2-5As of sufficient length act as second messengers to activate RNase L and thereby restrict viral replication. We expressed human OAS3 using the baculovirus system and purified it to homogeneity. We show that recombinant OAS3 is activated at a substantially lower concentration of dsRNA than OAS1, making it a potent in vivo sensor of dsRNA. Moreover, we find that OAS3 synthesizes considerably longer 2-5As than previously reported, and that OAS3 can activate RNase L intracellularly. The combined high affinity for dsRNA and the capability to produce 2-5As of sufficient length to activate RNase L suggests that OAS3 is a potent activator of RNase L. In addition, we provide experimental evidence to support one active site of OAS3 located in the C-terminal OAS domain and generate a low-resolution structure of OAS3 using SAXS. IMPORTANCE We are the first to purify the OAS3 enzyme to homogeneity, which allowed us to characterize the mechanism utilized by OAS3 and identify the active site. We provide compelling evidence that OAS3 can produce 2'-5'-oligoadenylates of sufficient length to activate RNase L. This is contrary to what is described in the current literature but agrees with recent in vivo data showing that OAS3 harbors an antiviral activity requiring RNase L. Thus, our work redefines our understanding of the biological role of OAS3. Furthermore, we used a combination of mutagenesis and small-angle X-ray scattering to describe the active site and low-resolution structure of OAS3.
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Affiliation(s)
- Mikkel Søes Ibsen
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Hans Henrik Gad
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Karthiga Thavachelvam
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Thomas Boesen
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Philippe Desprès
- Unité Interactions Moléculaires Flavivirus-Hôtes, Institut Pasteur, Paris, France
| | - Rune Hartmann
- Centre for Structural Biology, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
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Function and mechanism by which interferon regulatory factor-1 inhibits oncogenesis. Oncol Lett 2012; 5:417-423. [PMID: 23420765 PMCID: PMC3573131 DOI: 10.3892/ol.2012.1051] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 10/24/2012] [Indexed: 01/26/2023] Open
Abstract
The present review focuses on recent advances in the understanding of the molecular mechnisms by which interferon regulatory factor (IRF)-1 inhibits oncogenesis. IRF-1 is associated with regulation of interferon α and β transcription. In addition, numerous clinical studies have indicated that IRF-1 gene deletion or rearrangement correlates with development of specific forms of human cancer. IRF-1 has been revealed to exhibit marked functional diversity in the regulation of oncogenesis. IRF-1 activates a set of target genes associated with regulation of the cell cycle, apoptosis and the immune response. The role of IRF-1 in the regulation of various types of human tumor has important implications for understanding the susceptibility and progression of cancer. In addition, an improved understanding of the role of IRF-1 in the pathological processes that lead to human malignant diseases may aid development of novel therapeutic strategies.
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Extracellular 2'-5' oligoadenylate synthetase stimulates RNase L-independent antiviral activity: a novel mechanism of virus-induced innate immunity. J Virol 2010; 84:11898-904. [PMID: 20844035 DOI: 10.1128/jvi.01003-10] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The 2'-5' oligoadenylate synthetase (OAS) proteins are traditionally considered intracellular antiviral proteins. However, several studies demonstrate a correlation between the concentration of freely circulating OAS protein in sera from hepatitis C patients and their clinical prognosis. Here we demonstrate that extracellular OAS1 enters into cells and possesses a strong antiviral activity, both in vitro and in vivo, which is independent of RNase L. The OAS protein directly inhibits viral proliferation and does not require the activation of known antiviral signaling pathways. We propose that OAS produced by cells infected with viruses is released to the extracellular space, where it acts as a paracrine antiviral agent. Thus, the OAS protein represents the first direct antiviral compound released by virus-infected cells.
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10
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Rios JJ, Fleming JGW, Bryant UK, Carter CN, Huber JC, Long MT, Spencer TE, Adelson DL. OAS1 polymorphisms are associated with susceptibility to West Nile encephalitis in horses. PLoS One 2010; 5:e10537. [PMID: 20479874 PMCID: PMC2866329 DOI: 10.1371/journal.pone.0010537] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Accepted: 04/18/2010] [Indexed: 12/13/2022] Open
Abstract
West Nile virus, first identified within the United States in 1999, has since spread across the continental states and infected birds, humans and domestic animals, resulting in numerous deaths. Previous studies in mice identified the Oas1b gene, a member of the OAS/RNASEL innate immune system, as a determining factor for resistance to West Nile virus (WNV) infection. A recent case-control association study described mutations of human OAS1 associated with clinical susceptibility to WNV infection. Similar studies in horses, a particularly susceptible species, have been lacking, in part, because of the difficulty in collecting populations sufficiently homogenous in their infection and disease states. The equine OAS gene cluster most closely resembles the human cluster, with single copies of OAS1, OAS3 and OAS2 in the same orientation. With naturally occurring susceptible and resistant sub-populations to lethal West Nile encephalitis, we undertook a case-control association study to investigate whether, similar to humans (OAS1) and mice (Oas1b), equine OAS1 plays a role in resistance to severe WNV infection. We identified naturally occurring single nucleotide mutations in equine (Equus caballus) OAS1 and RNASEL genes and, using Fisher's Exact test, we provide evidence that mutations in equine OAS1 contribute to host susceptibility. Virtually all of the associated OAS1 polymorphisms were located within the interferon-inducible promoter, suggesting that differences in OAS1 gene expression may determine the host's ability to resist clinical manifestations associated with WNV infection.
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Affiliation(s)
- Jonathan J. Rios
- McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - JoAnn G. W. Fleming
- Department of Animal Science, Texas A&M University, College Station, Texas, United States of America
| | - Uneeda K. Bryant
- Livestock Disease Diagnostic Center, University of Kentucky, Lexington, Kentucky, United States of America
| | - Craig N. Carter
- Livestock Disease Diagnostic Center, University of Kentucky, Lexington, Kentucky, United States of America
| | - John C. Huber
- School of Rural Public Health, Texas A&M University, College Station, Texas, United States of America
| | - Maureen T. Long
- College of Veterinary Medicine, University of Florida, Gainesville, Florida, United States of America
| | - Thomas E. Spencer
- Department of Animal Science, Texas A&M University, College Station, Texas, United States of America
| | - David L. Adelson
- School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, South Australia, Australia
- * E-mail:
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Cheng BH, Liu Y, Xuei X, Liao CP, Lu D, Lasbury ME, Durant PJ, Lee CH. Microarray studies on effects of Pneumocystis carinii infection on global gene expression in alveolar macrophages. BMC Microbiol 2010; 10:103. [PMID: 20377877 PMCID: PMC2858032 DOI: 10.1186/1471-2180-10-103] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Accepted: 04/08/2010] [Indexed: 01/03/2023] Open
Abstract
Background Pneumocystis pneumonia is a common opportunistic disease in AIDS patients. The alveolar macrophage is an important effector cell in the clearance of Pneumocystis organisms by phagocytosis. However, both the number and phagocytic activity of alveolar macrophages are decreased in Pneumocystis infected hosts. To understand how Pneumocystis inactivates alveolar macrophages, Affymetrix GeneChip® RG-U34A DNA microarrays were used to study the difference in global gene expression in alveolar macrophages from uninfected and Pneumocystis carinii-infected Sprague-Dawley rats. Results Analyses of genes that were affected by Pneumocystis infection showed that many functions in the cells were affected. Antigen presentation, cell-mediated immune response, humoral immune response, and inflammatory response were most severely affected, followed by cellular movement, immune cell trafficking, immunological disease, cell-to-cell signaling and interaction, cell death, organ injury and abnormality, cell signaling, infectious disease, small molecular biochemistry, antimicrobial response, and free radical scavenging. Since rats must be immunosuppressed in order to develop Pneumocystis infection, alveolar macrophages from four rats of the same sex and age that were treated with dexamethasone for the entire eight weeks of the study period were also examined. With a filter of false-discovery rate less than 0.1 and fold change greater than 1.5, 200 genes were found to be up-regulated, and 144 genes were down-regulated by dexamethasone treatment. During Pneumocystis pneumonia, 115 genes were found to be up- and 137 were down-regulated with the same filtering criteria. The top ten genes up-regulated by Pneumocystis infection were Cxcl10, Spp1, S100A9, Rsad2, S100A8, Nos2, RT1-Bb, Lcn2, RT1-Db1, and Srgn with fold changes ranging between 12.33 and 5.34; and the top ten down-regulated ones were Lgals1, Psat1, Tbc1d23, Gsta1, Car5b, Xrcc5, Pdlim1, Alcam, Cidea, and Pkib with fold changes ranging between -4.24 and -2.25. Conclusions In order to survive in the host, Pneumocystis organisms change the expression profile of alveolar macrophages. Results of this study revealed that Pneumocystis infection affects many cellular functions leading to reduced number and activity of alveolar macrophages during Pneumocystis pneumonia.
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Affiliation(s)
- Bi-Hua Cheng
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
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12
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Kröger A, Dallügge A, Kirchhoff S, Hauser H. IRF-1 reverts the transformed phenotype of oncogenically transformed cells in vitro and in vivo. Oncogene 2003; 22:1045-56. [PMID: 12592391 DOI: 10.1038/sj.onc.1206260] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The expression of the transcriptional activator and tumor suppressor IRF-1 induces multiple effects that counteract the growth of tumor cells in vitro and in vivo. These include the inhibition of cell proliferation, the secretion of interferon-beta (IFN-beta), the induction of apoptosis specifically in certain cell types and the induction of a strong T-cell response. Here, we show that apart from its immune-activating properties, IRF-1 expression leads to a reversion of the tumorigenic phenotype of NIH3T3 cells transformed by different oncogenes. This was analysed in detail in a cell line in which the expression of c-Ha-ras and c-myc is under the control of a doxycycline-regulated promoter allowing to switch between the normal and oncogenic cell status. In the same cells, a beta-estradiol activatable IRF-1 fusion protein is expressed. After IRF-1 activation the oncogene-mediated acceleration of the cell cycle is reverted. Further, a complete IRF-1-mediated reversion of the oncogenic phenotype is observed in soft-agar growth assays. IRF-1 activation induces IFN-beta secretion; however, the observed effects are not mediated by IFN-beta. Inhibition of tumor growth is observed in nude mice as long as IRF-1 is active, indicating that neither B- nor T-cells must become activated for tumor growth suppression.
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MESH Headings
- 3T3 Cells/cytology
- 3T3 Cells/drug effects
- 3T3 Cells/metabolism
- 3T3 Cells/transplantation
- Animals
- Cell Cycle
- Cell Division
- Cell Transformation, Neoplastic/drug effects
- Cell Transformation, Neoplastic/genetics
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/physiology
- Doxycycline/pharmacology
- Estradiol/pharmacology
- Genes, erbB-1/drug effects
- Genes, erbB-2/drug effects
- Genes, myc/drug effects
- Genes, ras/drug effects
- Humans
- Interferon Regulatory Factor-1
- Interferon-beta/metabolism
- Male
- Mice
- Mice, Nude
- Neoplasms, Experimental/therapy
- Phenotype
- Phosphoproteins/genetics
- Phosphoproteins/physiology
- Promoter Regions, Genetic/drug effects
- Protein Structure, Tertiary
- Receptors, Estrogen/genetics
- Recombinant Fusion Proteins/biosynthesis
- Recombinant Fusion Proteins/physiology
- Transfection
- Tumor Stem Cell Assay
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Affiliation(s)
- Andrea Kröger
- Department of Gene Regulation and Differentiation, GBF - German Research Center for Biotechnology, Mascheroder Weg 1, D 38124 Braunschweig, Germany
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13
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Abstract
Tremendous progress has been made in understanding the molecular basis of the antiviral actions of interferons (IFNs), as well as strategies evolved by viruses to antagonize the actions of IFNs. Furthermore, advances made while elucidating the IFN system have contributed significantly to our understanding in multiple areas of virology and molecular cell biology, ranging from pathways of signal transduction to the biochemical mechanisms of transcriptional and translational control to the molecular basis of viral pathogenesis. IFNs are approved therapeutics and have moved from the basic research laboratory to the clinic. Among the IFN-induced proteins important in the antiviral actions of IFNs are the RNA-dependent protein kinase (PKR), the 2',5'-oligoadenylate synthetase (OAS) and RNase L, and the Mx protein GTPases. Double-stranded RNA plays a central role in modulating protein phosphorylation and RNA degradation catalyzed by the IFN-inducible PKR kinase and the 2'-5'-oligoadenylate-dependent RNase L, respectively, and also in RNA editing by the IFN-inducible RNA-specific adenosine deaminase (ADAR1). IFN also induces a form of inducible nitric oxide synthase (iNOS2) and the major histocompatibility complex class I and II proteins, all of which play important roles in immune response to infections. Several additional genes whose expression profiles are altered in response to IFN treatment and virus infection have been identified by microarray analyses. The availability of cDNA and genomic clones for many of the components of the IFN system, including IFN-alpha, IFN-beta, and IFN-gamma, their receptors, Jak and Stat and IRF signal transduction components, and proteins such as PKR, 2',5'-OAS, Mx, and ADAR, whose expression is regulated by IFNs, has permitted the generation of mutant proteins, cells that overexpress different forms of the proteins, and animals in which their expression has been disrupted by targeted gene disruption. The use of these IFN system reagents, both in cell culture and in whole animals, continues to provide important contributions to our understanding of the virus-host interaction and cellular antiviral response.
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Affiliation(s)
- C E Samuel
- Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, California 93106-9610, USA.
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14
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Naganuma A, Nozaki A, Tanaka T, Sugiyama K, Takagi H, Mori M, Shimotohno K, Kato N. Activation of the interferon-inducible 2'-5'-oligoadenylate synthetase gene by hepatitis C virus core protein. J Virol 2000; 74:8744-50. [PMID: 10954577 PMCID: PMC116387 DOI: 10.1128/jvi.74.18.8744-8750.2000] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The effects of hepatitis C virus (HCV) proteins on several signal transduction pathways in human nonneoplastic hepatocyte PH5CH8 cells were investigated using expression vectors encoding HCV proteins derived from HCV-infected human nonneoplastic cultured T-lymphocyte and hepatocyte cells (MT-2C and PH5CH7), which could support HCV replication. The amino acid sequences of HCV proteins obtained from HCV-infected human cells were identical or very close to the consensus sequences of the proteins derived from the original inoculum used for HCV infection. During the course of the study, we found that HCV core protein specifically activated the 40/46-kDa 2'-5'-oligoadenylate synthetase (2'-5'-OAS) gene promoter in a dose-dependent manner in different human hepatocyte cell lines (PH5CH8, HepG2, and PLC/PRF/5). We also found that the activation by core protein was further enhanced in the cells treated with alpha interferon. The expression of E1 or E2 envelope protein or nonstructural NS5A protein did not activate the 2'-5'-OAS gene promoter. We demonstrated that the activation by core protein in the hepatocyte cells was suppressed by antisense RNA complementary to core-encoding RNA. Deletion mutant analysis of core protein and deletion analysis of the 2'-5'-OAS gene promoter have been performed. Finally, we demonstrated that the activation of the 2'-5'-OAS gene occurred at the transcriptional level and furthermore demonstrated that the endogenous 2'-5'-OAS gene was also activated by core protein. This is the first report to show that a viral protein activated the 2'-5'-OAS gene.
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Affiliation(s)
- A Naganuma
- Virology and Glycobiology Division, National Cancer Center Research Institute, Chuo-ku, Tokyo 104-0045, Japan
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15
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Sancéau J, Hiscott J, Delattre O, Wietzerbin J. IFN-beta induces serine phosphorylation of Stat-1 in Ewing's sarcoma cells and mediates apoptosis via induction of IRF-1 and activation of caspase-7. Oncogene 2000; 19:3372-83. [PMID: 10918594 DOI: 10.1038/sj.onc.1203670] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Four human cell lines derived from Ewing's sarcoma, EW-7, EW-1, COH and ORS, were investigated to establish the effects of human recombinant interferon-alpha2a and human recombinant interferon-beta on cell proliferation and apoptosis. All four cell lines were much more sensitive to the antiproliferative effects of IFN-beta than of IFN-alpha. Analysis of the early signals triggered by IFN-alpha and IFN-beta demonstrated that the two IFNs were similarly effective in inducing tyrosine phosphorylation of the Jak-1 and Tyk-2 kinases and the transcription factors Stat-1 and Stat-2. Interestingly, an additional rapid phosphorylation of Stat-1 on serine was observed after IFN-beta treatment, with concomitant activation of p38 mitogen-activated protein kinase. In these cells, Stat-1 Ser727 phosphorylation in response to IFN-beta was found to be impaired by p38 MAPkinase inhibitor (SB203580). IFN-beta induced the formation of the Interferon Stimulated Gene Factor 3 complex more efficiently than IFN-alpha, as well as sustained induction of IRF-1, which may account for its greater induction of 2'5'oligo(A)synthetase and greater inhibition of cell proliferation. IFN-beta, but not IFN-alpha, induced apoptosis in wild-type p53 EW-7 and COH cell lines, but not in the mutated p53 EW-1 or ORS cell lines. The apoptosis induced by IFN-beta in EW-7 and COH cell lines appeared to be mediated by IRF-1 and involved the activation of caspase-7. Ectopic expression of IRF-1 induced apoptosis in all four cell lines which correlated with the activation of caspase-7 and with the downregulation of the Bcl-2 oncoprotein, as observed for IFN-beta-induced apoptosis in parental EW-7 and COH cell lines.
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Affiliation(s)
- J Sancéau
- INSERM U 365, Institut Curie, Paris, France
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16
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Kirchhoff S, Hauser H. Cooperative activity between HER oncogenes and the tumor suppressor IRF-1 results in apoptosis. Oncogene 1999; 18:3725-36. [PMID: 10391680 DOI: 10.1038/sj.onc.1202704] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The tumor suppressor transcription factor IRF-1 inhibits cell growth. In this report we show that IRF-1 also induces apoptosis of highly transformed and tumorigenic cell lines. This activity of IRF-1 is demonstrated with cell lines expressing HER oncogenes and an activatable IRF-1 fusion protein. Growth of cell lines expressing inactive HER1 is inhibited on IRF-1 activation. In contrast, the same cells are killed by apoptosis when HER1 and IRF-1 are activated simultaneously. We identified promoters stimulated synergistically by IRF-1 and by activated HER1. To determine the signals causing transcriptional synergism and/or apoptosis we tried to modulate these effects by various dominant negative acting proteins. Dominant negative STAT5alpha abolished both induction of apoptosis and transcriptional synergy of IRF-1 and HER. Thus, these results provide new insights into the mechanism of oncogene-dependent apoptosis induced by the activation of a tumor suppressor.
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Affiliation(s)
- S Kirchhoff
- Department of Gene Regulation and Differentiation, GBF-National Research Center for Biotechnology, Braunschweig, Germany
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17
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Coccia EM, Del Russo N, Stellacci E, Orsatti R, Benedetti E, Marziali G, Hiscott J, Battistini A. Activation and repression of the 2-5A synthetase and p21 gene promoters by IRF-1 and IRF-2. Oncogene 1999; 18:2129-37. [PMID: 10321737 DOI: 10.1038/sj.onc.1202536] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The Interferon Regulatory Factors-1 and -2 (IRF-1 and IRF-2) were originally identified as transcriptional regulators of the interferon (IFN) and IFN-stimulated genes. These factors also modulate immune response and play a role in cell growth regulation. In this study we analysed the effect of the ectopic expression of IRF-1 and IRF-2 on the regulation of two potential IRF target genes involved in cell growth regulation, 2-5A synthetase and p21 (WAF/CP1), both of which contain consensus binding sites for IRF family members within their promoters. Following ectopic expression, IRF-1 transactivated 2-5A synthetase and p21 genes, an effect that was counterbalanced by concomitant ectopic expression of IRF-2. These effects were mediated by direct binding of IRF to the gene promoters. A construct expressing an IRF-2 antisense (FRI-2) was able to revert the inhibitory effect of IRF-2 on the IRF-1 transactivation. IRF-1 also induced expression of its homologous repressor IRF-2 as indicated by EMSA analysis using an IRF-E probe from the IRF-2 promoter; and by cotransfection of IRF-1 together with an IRF-2 promoter CAT construct. Therefore, the induction of IRF-1 by IFNs or other stimuli acts as a transactivator of genes involved in cell growth regulation, as well as of its own repressor IRF-2, thus providing autoinhibitory regulation of IRF-1 activated genes.
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Affiliation(s)
- E M Coccia
- Laboratory of Virology, Istituto Superiore di Sanità, Rome, Italy
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18
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Yamagata T, Nishida J, Tanaka S, Sakai R, Mitani K, Yoshida M, Taniguchi T, Yazaki Y, Hirai H. A novel interferon regulatory factor family transcription factor, ICSAT/Pip/LSIRF, that negatively regulates the activity of interferon-regulated genes. Mol Cell Biol 1996; 16:1283-94. [PMID: 8657101 PMCID: PMC231112 DOI: 10.1128/mcb.16.4.1283] [Citation(s) in RCA: 167] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
We have isolated a novel cDNA clone encoding interferon (IFN) consensus sequence-binding protein in adult T-cell leukemia cell line or activated T cells (ICSAT); this protein is the human homolog of the recently cloned Pip/LSIRF. ICSAT is structurally most closely related to the previously cloned ICSBP, a member of the IFN regulatory factor (IRF) family of proteins that binds to interferon consensus sequences (ICSs) found in many promoters of the IFN-regulated genes. Among T-cell lines investigated, ICSAT was abundantly expressed in human T-cell leukemia virus type 1 (HTLV-1)-infected T cells. When the HTLV-1 tax gene was expressed or phorbol myristake acetate-A23187 stimulation was used, ICSAT expression was induced in Jurkat cells which otherwise do not express ICSAT. When the binding of ICSAT to four different ICSs was tested, the relative differences in binding affinities for those ICSs were determined. To study the functional role of ICSAT, we performed cotransfection experiments with the human embryonal carcinoma cell line N-Tera2. ICSAT was demonstrated to possess repressive function over the gene activation induced by IFN stimulation or by IRF-1 cotransfection. Such repressive function is similar to that seen in IRF-2 or ICSBP. However, we have found that ICSAT has a different repressive effect from that of IRF-2 or ICSBP in some IFN-responsive reporter constructs. These results suggest that a novel mechanism of gene regulation by "differential repression" is used by multiple members of repressor proteins with different repressive effects on the IFN-responsive genes.
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Affiliation(s)
- T Yamagata
- Third Department of Internal Medicine, Tokyo University, Japan
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19
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Harroch S, Gothelf Y, Revel M, Chebath J. 5' upstream sequences of MyD88, an IL-6 primary response gene in M1 cells: detection of functional IRF-1 and Stat factors binding sites. Nucleic Acids Res 1995; 23:3539-46. [PMID: 7567467 PMCID: PMC307235 DOI: 10.1093/nar/23.17.3539] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Transcription regulatory elements have been analyzed in upstream sequences of an Interleukin-6 (Il-6) primary response gene, MyD88. MyD88 2.3 kb mRNA is strongly and persistently induced in the course of myeloleukemic M1 cells differentiation with Il-6. MyD88 cDNA sequences were found in a region of 12 kb of mouse genomic DNA. Using Il-6 treated M1 cell RNAs, two transcription start sites have been localized, approximately 100 bp upstream from the 5' end of the cloned cDNA. We sequenced 1.4 kb of 5' genomic DNA including the first exon. In 5' of mRNA transcription start site, MyD88 nucleotidic sequence is 85% identical to 5' complementary sequences of the rat 3'-ketoacetyl CoA thiolase gene, over 1.2 kb. A DNA element conferring Il-6-inducible transcription to reporter genes, and localized 30 bp upstream of MyD88 first RNA start site, contains overlapping binding sites for cytokine activated transcription factors Stat and for the Interferon Regulatory Factor-1 and -2 (IRF-1 and IRF-2). In vitro binding assays showed that attachment of Stat factors to this element early in Il-6 treatment requires tyrosine kinase activation. IRF1, an activator of transcription, is also induced to bind to this sequence at later times. A model of persistent activation of MyD88 gene through these two types of factors is proposed.
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MESH Headings
- Adaptor Proteins, Signal Transducing
- Animals
- Antigens, Differentiation
- Base Sequence
- Cloning, Molecular
- DNA-Binding Proteins/metabolism
- Gene Expression Regulation/drug effects
- Genes
- Genes, Immediate-Early
- Humans
- Immediate-Early Proteins/genetics
- In Vitro Techniques
- Interferon Regulatory Factor-1
- Interferon Regulatory Factor-2
- Interleukin-6/pharmacology
- Mice
- Molecular Sequence Data
- Myeloid Differentiation Factor 88
- Phosphoproteins/metabolism
- Promoter Regions, Genetic
- Proteins/genetics
- RNA, Messenger/genetics
- Receptors, Immunologic
- Regulatory Sequences, Nucleic Acid
- Repressor Proteins
- STAT1 Transcription Factor
- STAT3 Transcription Factor
- Trans-Activators/metabolism
- Transcription Factors/metabolism
- Transcription, Genetic/drug effects
- Tumor Cells, Cultured
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Affiliation(s)
- S Harroch
- Department of Molecular Genetics and Virology, Weizmann Institute of Science, Rehovot, Israel
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20
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Recognition DNA sequences of interferon regulatory factor 1 (IRF-1) and IRF-2, regulators of cell growth and the interferon system. Mol Cell Biol 1993. [PMID: 7687740 DOI: 10.1128/mcb.13.8.4531] [Citation(s) in RCA: 274] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Interferon (IFN) regulatory factor 1 (IRF-1) and IRF-2 were originally identified as transcription factors involved in the regulation of the IFN system. IRF-1 functions as a transcriptional activator, while IRF-2 represses IRF-1 function. More recently, evidence has been provided that IRF-1 and IRF-2 manifest antioncogenic and oncogenic properties, respectively, and that loss of one or both of the IRF-1 alleles may be critical for the development of human hematopoietic neoplasms. Both factors show a high degree of structural similarity in their N-terminal DNA-binding domains, and previous studies suggested that IRF-1 and IRF-2 bind to similar or identical cis elements within type I IFN (IFN-alpha and -beta) and IFN-inducible genes. However, the exact recognition sequences of these two factors have not yet been determined; hence, the spectrum of the IRF-responsive genes remains unclear. In this study, we determined the DNA sequences recognized by IRF-1 and IRF-2, using a polymerase chain reaction-assisted DNA-binding site selection method. We report that sequences selected by this method and the affinities for each sequence were virtually indistinguishable between IRF-1 and IRF-2. We confirm the presence of two contiguous IRF recognition sequences within the promoter region of the IFN-beta gene and of at least one such sequence in all of the IFN-inducible genes examined. Furthermore, we report the presence of potential IRF sequences in the upstream region of several genes involved in cell growth control.
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21
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Tanaka N, Kawakami T, Taniguchi T. Recognition DNA sequences of interferon regulatory factor 1 (IRF-1) and IRF-2, regulators of cell growth and the interferon system. Mol Cell Biol 1993; 13:4531-8. [PMID: 7687740 PMCID: PMC360068 DOI: 10.1128/mcb.13.8.4531-4538.1993] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Interferon (IFN) regulatory factor 1 (IRF-1) and IRF-2 were originally identified as transcription factors involved in the regulation of the IFN system. IRF-1 functions as a transcriptional activator, while IRF-2 represses IRF-1 function. More recently, evidence has been provided that IRF-1 and IRF-2 manifest antioncogenic and oncogenic properties, respectively, and that loss of one or both of the IRF-1 alleles may be critical for the development of human hematopoietic neoplasms. Both factors show a high degree of structural similarity in their N-terminal DNA-binding domains, and previous studies suggested that IRF-1 and IRF-2 bind to similar or identical cis elements within type I IFN (IFN-alpha and -beta) and IFN-inducible genes. However, the exact recognition sequences of these two factors have not yet been determined; hence, the spectrum of the IRF-responsive genes remains unclear. In this study, we determined the DNA sequences recognized by IRF-1 and IRF-2, using a polymerase chain reaction-assisted DNA-binding site selection method. We report that sequences selected by this method and the affinities for each sequence were virtually indistinguishable between IRF-1 and IRF-2. We confirm the presence of two contiguous IRF recognition sequences within the promoter region of the IFN-beta gene and of at least one such sequence in all of the IFN-inducible genes examined. Furthermore, we report the presence of potential IRF sequences in the upstream region of several genes involved in cell growth control.
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Affiliation(s)
- N Tanaka
- Institute for Molecular and Cellular Biology, Osaka University, Japan
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22
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Two cis-DNA elements involved in myeloid-cell-specific expression and gamma interferon (IFN-gamma) activation of the human high-affinity Fc gamma receptor gene: a novel IFN regulatory mechanism. Mol Cell Biol 1993. [PMID: 8455606 DOI: 10.1128/mcb.13.4.2182] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The human high-affinity receptor for the constant region of immunoglobulin G (human Fc gamma R1) is encoded by two mRNAs induced selectively by gamma interferon (IFN-gamma) and expressed in cells of myeloid lineage. The cis-DNA element (GRR) previously found to confer IFN-gamma responsiveness to this gene acts as an inducible enhancer and is the target of an IFN-gamma-activated factor(s) (GIRE-BP) in cells of different origins. Although the GRR motif is not related to the DNA elements involved in the regulation of other IFN-stimulated genes, GIRE-BP binding depends on the IFN-gamma-dependent activation of the 91-kDa protein known to be one of the factors of a transcriptional complex activated by IFN-alpha. Deletions of the Fc gamma R1 promoter allowed us to identify a 25-bp element, downstream from the GRR motif, conferring cell-type-specific expression. This element, called MATE (myeloid activating transcription element), is the DNA target for constitutive factors forming two complexes, MATE-BP1 and MATE-BP2. In accordance with the functional analysis, MATE-BP binding activities were detected in extracts prepared from myeloid cell lines such as THP-1, HL-60, and U-937 but not in HeLa cell extracts. The MATE motif is present not only in the promoter of other Fc receptor genes but also in several promoters of genes whose expression is restricted to monocytic cells. Our results suggest that human Fc gamma R1 gene expression in myeloid cells is initiated by the interaction of IFN-gamma-activated factors with cell-type-specific factors through their binding to the GRR and MATE motifs.
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23
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Perez C, Wietzerbin J, Benech PD. Two cis-DNA elements involved in myeloid-cell-specific expression and gamma interferon (IFN-gamma) activation of the human high-affinity Fc gamma receptor gene: a novel IFN regulatory mechanism. Mol Cell Biol 1993; 13:2182-92. [PMID: 8455606 PMCID: PMC359539 DOI: 10.1128/mcb.13.4.2182-2192.1993] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The human high-affinity receptor for the constant region of immunoglobulin G (human Fc gamma R1) is encoded by two mRNAs induced selectively by gamma interferon (IFN-gamma) and expressed in cells of myeloid lineage. The cis-DNA element (GRR) previously found to confer IFN-gamma responsiveness to this gene acts as an inducible enhancer and is the target of an IFN-gamma-activated factor(s) (GIRE-BP) in cells of different origins. Although the GRR motif is not related to the DNA elements involved in the regulation of other IFN-stimulated genes, GIRE-BP binding depends on the IFN-gamma-dependent activation of the 91-kDa protein known to be one of the factors of a transcriptional complex activated by IFN-alpha. Deletions of the Fc gamma R1 promoter allowed us to identify a 25-bp element, downstream from the GRR motif, conferring cell-type-specific expression. This element, called MATE (myeloid activating transcription element), is the DNA target for constitutive factors forming two complexes, MATE-BP1 and MATE-BP2. In accordance with the functional analysis, MATE-BP binding activities were detected in extracts prepared from myeloid cell lines such as THP-1, HL-60, and U-937 but not in HeLa cell extracts. The MATE motif is present not only in the promoter of other Fc receptor genes but also in several promoters of genes whose expression is restricted to monocytic cells. Our results suggest that human Fc gamma R1 gene expression in myeloid cells is initiated by the interaction of IFN-gamma-activated factors with cell-type-specific factors through their binding to the GRR and MATE motifs.
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Affiliation(s)
- C Perez
- Unité 196 Institut National de la Santé et de la Recherche Médicale, Section Biologie, Institut Curie, Paris, France
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24
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Interferon consensus sequence-binding protein, a member of the interferon regulatory factor family, suppresses interferon-induced gene transcription. Mol Cell Biol 1993. [PMID: 7678054 DOI: 10.1128/mcb.13.1.588] [Citation(s) in RCA: 109] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We previously isolated a cDNA clone encoding interferon consensus sequence-binding protein (ICSBP), a member of the interferon regulatory factor (IRF) family, that binds to the interferon (IFN)-stimulated response element (ISRE) of many IFN-regulated genes. In this investigation, we studied the functional role of ICSBP by transient cotransfection of ICSBP cDNA with IFN-responsive reporter genes into the human embryonal carcinoma cell line N-Tera2. These cells were shown not to express ICSBP or IRF-2, thus allowing functional analysis of transfected cDNAs. Cotransfection of ICSBP into cells treated with retinoic acid or any of the IFNs (alpha, beta, or gamma) repressed expression of a chloramphenicol acetyltransferase reporter driven by the major histocompatibility complex class I gene promoter. Similarly, ICSBP repressed expression of chloramphenicol acetyltransferase reporters driven by the ISREs of the 2'-5' oligoadenylate synthetase, guanylate-binding protein, and ISG-15 genes in IFN-treated cells. The repression was dependent on the presence of the ISRE in the reporter. Deletion analysis showed that the putative N-terminal DNA binding domain of ICSBP by itself is capable of mediating the repression. Using the same cotransfection conditions as for ICSBP, a similar repression of these reporters was observed with IRF-2. Finally, ICSBP repressed the IRF-1-mediated induction of major histocompatibility complex class I and IFN-beta reporters in the absence of IFN or retinoic acid. Taken together, these results suggest that ICSBP is a negative regulatory factor capable of repressing transcription of target genes induced by IFN, retinoic acid, or IRF-1.
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25
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Nelson N, Marks MS, Driggers PH, Ozato K. Interferon consensus sequence-binding protein, a member of the interferon regulatory factor family, suppresses interferon-induced gene transcription. Mol Cell Biol 1993; 13:588-99. [PMID: 7678054 PMCID: PMC358938 DOI: 10.1128/mcb.13.1.588-599.1993] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We previously isolated a cDNA clone encoding interferon consensus sequence-binding protein (ICSBP), a member of the interferon regulatory factor (IRF) family, that binds to the interferon (IFN)-stimulated response element (ISRE) of many IFN-regulated genes. In this investigation, we studied the functional role of ICSBP by transient cotransfection of ICSBP cDNA with IFN-responsive reporter genes into the human embryonal carcinoma cell line N-Tera2. These cells were shown not to express ICSBP or IRF-2, thus allowing functional analysis of transfected cDNAs. Cotransfection of ICSBP into cells treated with retinoic acid or any of the IFNs (alpha, beta, or gamma) repressed expression of a chloramphenicol acetyltransferase reporter driven by the major histocompatibility complex class I gene promoter. Similarly, ICSBP repressed expression of chloramphenicol acetyltransferase reporters driven by the ISREs of the 2'-5' oligoadenylate synthetase, guanylate-binding protein, and ISG-15 genes in IFN-treated cells. The repression was dependent on the presence of the ISRE in the reporter. Deletion analysis showed that the putative N-terminal DNA binding domain of ICSBP by itself is capable of mediating the repression. Using the same cotransfection conditions as for ICSBP, a similar repression of these reporters was observed with IRF-2. Finally, ICSBP repressed the IRF-1-mediated induction of major histocompatibility complex class I and IFN-beta reporters in the absence of IFN or retinoic acid. Taken together, these results suggest that ICSBP is a negative regulatory factor capable of repressing transcription of target genes induced by IFN, retinoic acid, or IRF-1.
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Affiliation(s)
- N Nelson
- Laboratory of Molecular Growth Regulation, National Institute of Child Health and Human Development, Bethesda, Maryland 20892
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26
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Yan C, Tamm I. Molecular cloning and characterization of additional factors that bind to the interferon-alpha/beta response element B of the murine (2'-5')oligoadenylate synthetase ME-12 gene. Proc Natl Acad Sci U S A 1992; 89:8859-63. [PMID: 1409578 PMCID: PMC50023 DOI: 10.1073/pnas.89.19.8859] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The function of interferon (IFN) response elements (IREs) may be classified into two classes according to the location of the IRE in the polymerase II transcription promoter: located upstream of the core promoter, or located within the core promoter. Thus, the IRE-binding factors (IREBFs) can serve as sequence-specific transcription factors that activate IFN-inducible gene transcription and they can participate in preinitiation complex formation. In the murine and human (2'-5')oligoadenylate synthetase genes the IRE is located within the core promoter region. For this reason, it is important to isolate cDNAs encoding protein factors that can bind to this IRE and determine their functional roles in the regulation of expression of the IFN-inducible (2'-5')oligoadenylate synthetase gene. We have isolated three groups of cDNAs that encode IREBFs. Here we report on clone 38 cDNA, which contains an open reading frame encoding a protein of 277 amino acids that is designated IREBF-2. The C terminus of IREBF-2 is extremely proline-rich and contains a high percentage of short-armed amino acids. IREBF-2 shares marked similarity with some gene products of the herpes group of viruses. These gene products are potent transcription activators. IREBF-2 is constitutively expressed in BALB/c 3T3 cells.
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Affiliation(s)
- C Yan
- Rockefeller University, New York, NY 10021-6399
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27
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Benech PD, Sastry K, Iyer RR, Eichbaum QG, Raveh DP, Ezekowitz RA. Definition of interferon gamma-response elements in a novel human Fc gamma receptor gene (Fc gamma RIb) and characterization of the gene structure. J Exp Med 1992; 176:1115-23. [PMID: 1402657 PMCID: PMC2119393 DOI: 10.1084/jem.176.4.1115] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The human Fc gamma RI (CD64) is a high affinity receptor for the Fc portion of immunoglobulin (Ig), and its constitutively low expression on the cell surface of monocyte/macrophage and neutrophils is selectively upregulated by interferon gamma (IFN-gamma) treatment (Perussia, B., E. T. Dayton, R. Lazarus, V. Fanning, and G. Trinchieri. 1983. J. Exp. Med. 158:1092). Three distinct cDNAs have been cloned and code for proteins that predict three extracellular Ig-like domains (Allen, J.M., and B. Seed. 1989. Science [Wash. DC]. 243:378). Several differences in the coding region of these cDNAs suggest that in addition to polymorphic differences a second Fc gamma RI gene could possibly exist. This alternative Fc gamma RI gene (Fc gamma RIb) was defined by the lack of a genomic HindIII restriction site (van der Winkel, J. G. J., L. U. Ernst, C. L. Anderson, and I. M. Chiu. 1991. J. Biol. Chem. 266:13449). We describe the characterization a second gene (Fc gamma RIb) that has a termination codon in the third extracellular domain and therefore predicts a soluble form of a termination codon in the third extracellular domain and therefore predicts a soluble form of the receptor. We also define two distinct IFN-gamma-responsive regions in the 5' flanking sequence of Fc gamma RIb that resemble motifs that have been defined in the class II major histocompatibility complex promoter. The Fc gamma RIb promoter does not possess canonical TATA or CCAAT boxes, but does possess a palindromic motif that closely resembles the initiator sequence identified in the terminal deoxynucleotidyl transferase/human leukocyte IFN/adeno-associated virus type II P5 gene promoters (Smale, S. T., and D. Baltimore. 1989. Cell. 57:103; Seto, E., Y. Shi, and T. Shenk. 1991. Nature [Lond.]. 354:241; Roy, A. L., M. Meisterernst, P. Pognonec, and R. C. Roeder. 1991. Nature [Lond.]. 354:245) virus type II P5 gene promoters raising interesting questions as to its role in the basal and myeloid-specific transcription of this gene.
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Affiliation(s)
- P D Benech
- Division of Hematology/Oncology, Children's Hospital, Boston, Massachusetts
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28
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Chang KC, Hansen E, Jaenicke T, Goldspink G, Butterworth P. Transformation of a novel direct-repeat repressor element into a promoter and enhancer by multimerisation. Nucleic Acids Res 1992; 20:1669-74. [PMID: 1374558 PMCID: PMC312254 DOI: 10.1093/nar/20.7.1669] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Studies on the regulation of interferon (IFN) responsive genes have mainly been centred on the highly conserved IFN stimulated responsive elements (ISREs) which can mediate type I and II IFN inducibility. To date little is known about other functional cis-acting regulatory motifs in IFN responsive genes. We report here on the identification of a repressor element in the human MxA gene defined to a 19 base pair (bp) region which houses a 9 bp direct repeat. DNA-specific protein binding on this element is not affected by IFN treatment and is distinct from ISRE binding proteins. Remarkably, contrary to expectations, when the repressor element is multimerised and spliced, in either orientation, to a reporter gene it behaves like a functional, constitutive promoter. Positioning the multimerised element in front of the SV40 enhancerless promoter also led to enhanced expression. The same protein(s) seem to bind to both the single repressor element and its multimerised form. This discovery of phenotypic reversal on a repressor element via multimerisation may have important implications in vivo.
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Affiliation(s)
- K C Chang
- Unit of Veterinary Molecular and Cellular Biology, Royal Veterinary College, University of London, UK
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29
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Coccia EM, Vaiman D, Raber J, Marziali G, Fiorucci G, Orsatti R, Cohen B, Nissim N, Romeo G, Affabris E. Protein binding to the interferon response enhancer correlates with interferon induction of 2'-5'-oligoadenylate synthetase in normal and interferon-resistant Friend cells. J Virol 1991; 65:2081-7. [PMID: 1705997 PMCID: PMC240065 DOI: 10.1128/jvi.65.4.2081-2087.1991] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The induction of transcription of the 2'-5'-oligoadenylate (2-5A) synthetase gene by type I (alpha/beta) and type II (gamma) interferons (IFNs) has been studied in wild-type (w.t.) and IFN-resistant Friend leukemia cells (FLC). Following IFN treatment, new complexes are formed in vitro between the IFN-responsive sequence (IRS) of the 2-5A synthetase gene and cellular proteins. Within minutes after IFN-alpha/beta addition to w.t. FLC, an IRS-protein complex, designated F1, is detected, as already observed in several human cell lines. In response to IFN-gamma, a novel complex, designated Fg, is observed in w.t. FLC. The Fg complex appears within 3 h, while an F1-like complex is faintly visible 10 to 24 h later. In the IFN-alpha/beta-resistant FLC, IFN-gamma induces only the Fg complex and fails to induce F1. Fg formation is correlated with the IFN-gamma-induced transcription of the 2-5A synthetase gene and the appearance of the corresponding enzymatic activity in both w.t. and IFN-alpha/beta-resistant FLC. These findings suggest that F1 and Fg represent two distinct effector complexes by which type I and type II IFNs, respectively, induce 2-5A synthetase.
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Affiliation(s)
- E M Coccia
- Laboratorio di Virologia, Istituto Superiore di Sanità, Rome, Italy
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30
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Roy C, Lebleu B. DNA protein interactions at the interferon-responsive promoter elements: potential for an H-DNA conformation. Nucleic Acids Res 1991; 19:517-24. [PMID: 1707163 PMCID: PMC333642 DOI: 10.1093/nar/19.3.517] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The regions of several genes (IFI-56K, HLA-A3, HLA-DR and 6-16) containing the (putative) ISRE (Interferon Stimulatable Response Element) were tested for their ability to be recognized by HeLa cells nuclear extract proteins. In a band shift assay, all probes yielded two B1 and B2 DNA-protein complexes of similar mobilities. Unexpectedly the titration of the B1 complex with a synthetic ISRE core (OL1), promoted the formation of B2. Both the probe and OL1 were recovered in B2. For each probe, the possibility of the part of the sequence involved in B1 complex to form a H-DNA structure with the part of the sequence involved in B2 exists. Such a structure was favored by the colinearity of the pairing regions and requires ATP. Although probes seemed to have a secondary structure, the formal existence of a H-DNA structure has not been demonstrated. Such a model could be extended to other interferon inducible gene promoters and may account for their binding properties and differential inducibility after 5' deletion or point mutations.
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Affiliation(s)
- C Roy
- Laboratoire de Biochimie des Protéines, URA CNRS 1191, Université Montpellier II, France
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31
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Mills FC, Brooker JS, Camerini-Otero RD. Sequences of human immunoglobulin switch regions: implications for recombination and transcription. Nucleic Acids Res 1990; 18:7305-16. [PMID: 2124350 PMCID: PMC332867 DOI: 10.1093/nar/18.24.7305] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
We have sequenced the entire human S mu and S gamma 4 immunoglobulin heavy chain class switch regions, and have also completed the sequence of human S epsilon. S mu is composed predominantly of GAGCT and GGGCT pentameric repeats, with these units also being found in S epsilon at a much lower density. S mu-S gamma 4 matches are infrequent, but S gamma 4 contains a cluster of repeated sequences similar to units in mouse gamma switch sites and unrelated to the S mu repeats, suggesting that S mu-S gamma homology is not important in mu-gamma switching. We examined our epsilon and gamma 4 sequences for features that could regulate production of 'sterile' transcripts preceding switch recombination. There is an Evolutionarily Conserved Sequence (ECS) upstream from the human and mouse S epsilon regions that overlaps and extends 5' to the start sites for human and mouse epsilon sterile transcripts. Similarly, an ECS upstream from S gamma 4 is homologous to a mouse sequence that overlaps and extends 5' to the start sites for mouse gamma 2b sterile transcripts. The epsilon and gamma 4 conserved segments contain potential Interferon Stimulable Response Elements (ISRE's) that are identical between human epsilon and gamma 4.
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Affiliation(s)
- F C Mills
- Genetics and Biochemistry Branch, NIDDK, NIH, Bethesda, MD 20892
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32
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Seong DC, Sims S, Johnson E, Howard OM, Reiter B, Hester J, Talpaz M, Kantarjian H, Deisseroth A. A phosphatase activity present in peripheral blood myeloid cells of chronic myelogenous leukemia patients but not normal individuals alters nuclear protein binding to transcriptional enhancers of interferon-inducible genes. J Clin Invest 1990; 86:1664-70. [PMID: 2243138 PMCID: PMC296917 DOI: 10.1172/jci114889] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Cytoplasmic protein from peripheral blood myeloid cells of chronic myelogenous leukemia (CML) patients altered the electrophoretic mobility of complexes formed between nuclear proteins and interferon-inducible transcriptional enhancers. Immature myeloid marrow cells (blasts and promyelocytes) have a higher level of this activity than do mature myeloid marrow cells (bands and polys). This activity, which is not detectable in the peripheral blood cells of normal individuals, is at least 50-fold higher in CML marrow blasts and promyelocytes than that found in marrow blasts and promyelocytes of normal individuals. This activity was inhibited by in vivo incubation of immature myeloid cells with the phosphatase inhibitor, sodium orthovanadate (0.2 mM), and by adding orthovanadate (20 mM) directly to cytoplasmic proteins of myeloid cells. Interferon-alpha (1,000 U/ml) reduced the effects of the CML myeloid cell cytoplasmic protein on the electrophoretic mobility of nuclear protein-DNA complexes. These data suggest that a unique phosphatase may be involved in the abnormalities in CML which are modulated by interferon-alpha.
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MESH Headings
- Acid Phosphatase/blood
- Base Sequence
- Bone Marrow/pathology
- Electrophoresis
- Enhancer Elements, Genetic
- Gene Expression Regulation, Neoplastic
- Humans
- Interferon Type I/pharmacology
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/blood
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/enzymology
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Molecular Sequence Data
- Nuclear Proteins/metabolism
- Temperature
- Transcription, Genetic
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Affiliation(s)
- D C Seong
- Department of Hematology, University of Texas M.D. Anderson Cancer Center, Houston 77030
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33
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Roy C, Lebleu B. DNA-protein interactions at the interferon-responsive promoter: evidences for an involvement of phosphorylation. Nucleic Acids Res 1990; 18:2125-31. [PMID: 1692413 PMCID: PMC330692 DOI: 10.1093/nar/18.8.2125] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Several alpha beta and gamma interferons (IFN) induced genes are regulated transcriptionally via a 29 bp cis acting regulatory element (ICS, Interferon Consensus Sequence). The ICS binding capacity of HeLa cell nuclear extracts was strictly dependent on the presence of nucleoside triphosphate and Mg2+. It increased upon alpha beta or gamma IFN treatment of the cells. Three 50 mer synthetic oligonucleotides containing the ICS or putative ISRE (Interferon Stimulatable Response Element), representing portions of genes inducible by alpha beta IFN (HLA-A3 and IFI-56K) or by gamma (HLA-DR) were used as probes to titrate nuclear factors interacting with the ICS. All three probes were retarded in a mobility shift assay in two bands. Phosphorylation conditions were crucial for demonstrating their existence and/or their relative amounts. A factor whose activity and/or amount was modulated upon IFN treatment, appeared to be involved in phosphorylation dependent post-translational modification(s) of the ISRE binding proteins responsible for altered binding properties.
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Affiliation(s)
- C Roy
- UA CNRS 1191, Laboratoire de Biochimie des Protéines, Université de Montpellier II, France
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34
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Finn PW, Kara CJ, Douhan J, Van TT, Folsom V, Glimcher LH. Interferon gamma regulates binding of two nuclear protein complexes in a macrophage cell line. Proc Natl Acad Sci U S A 1990; 87:914-8. [PMID: 2105504 PMCID: PMC53379 DOI: 10.1073/pnas.87.3.914] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Interferon gamma (IFN-gamma) is a potent inducer of major histocompatibility complex (MHC) antigens during normal immune responses and in abnormal responses in autoimmune disease. In this report we identify two nuclear factors whose binding to the murine E beta class II MHC beta-chain gene is regulated by this cytokine. IFN-gamma stimulation of murine macrophages results in the appearance of increased binding of one protein complex, complex A, and decreased binding of a second, faster migrating protein complex, complex B. Although the contact residues for both of these proteins lie within the highly conserved Y-box transcriptional element, their binding specificity differs. The protein in complex B is a CCAAT-box-binding protein that may be similar or identical to NF-Y or YB1, previously identified class II Y-box-binding proteins. The DNA sequence requirements for the binding of the slower migrating complex, complex A, are not limited to CCAAT-box sequences but include sequences upstream of the Y box. These upstream sequences are required both for IFN-gamma-induced gene transcription and for IFN-gamma-induced modulation of binding activity. These data suggest a model in which upstream sequences contribute to formation of a lymphokine-regulated complex downstream. The IFN-gamma-induced binding protein described as complex A in this report differs from the IFN-gamma, -alpha, or -beta-induced nuclear factors previously identified.
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Affiliation(s)
- P W Finn
- Department of Cancer Biology, Harvard School of Public Health, Boston, MA 02115
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35
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Nonaka M, Gitlin JD, Colten HR. Regulation of human and murine complement: comparison of 5' structural and functional elements regulating human and murine complement factor B gene expression. Mol Cell Biochem 1989; 89:1-14. [PMID: 2506433 DOI: 10.1007/bf00228274] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The serine protease complement factor B (Bf), an acute phase plasma protein, is a component of the alternative pathway of complement activation. Previous studies revealed that several cytokines including IFN-gamma and IL-1 are involved in mediating acute phase Bf expression. To determine the molecular details of Bf expression we isolated, sequenced and characterized the 5' flanking regions of the human and murine Bf genes. In both species the Bf transcriptional start site in liver was located less than 400 bp 3' to the polyadenylation site of the upstream C2 gene. This upstream intergenic region contained greater than 65% nucleotide homology between species. Within this region, an IRS and three heat shock consensus elements were found in the murine sequence in an identical position to that of the human. To examine the functional details of Bf expression, a series of mouse and human Bf promoter-chloramphenicol acetyltransferase (CAT) chimeric gene constructs were transfected into mouse L or human HepG2 cells. Analysis of expression of these fusion gene constructs revealed that 1) cis-acting DNA sequences identified, at least in part, in the 3' untranslated region of the C2 gene (within the 400 bp upstream of the Bf cap site) mediate responsiveness to IL-1 and IFN-gamma, 2) the responsiveness to each mediator appears to be conferred by separate upstream regions similar in position and homologous in man and mouse, and 3) the IL-1 responsive region in both species appears to have the characteristics of an enhancer element. The results of this analysis suggest a selective pressure to conserve the intergenic sequence between C2 and Bf genes and that further studies of these sequences will be useful in elucidating mechanisms controlling the acute phase response.
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Affiliation(s)
- M Nonaka
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, Children's Hospital, St. Louis, MO 63110
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36
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Yan C, Sehgal PB, Tamm I. Signal transduction pathways in the induction of 2',5'-oligoadenylate synthetase gene expression by interferon alpha/beta. Proc Natl Acad Sci U S A 1989; 86:2243-7. [PMID: 2538838 PMCID: PMC286888 DOI: 10.1073/pnas.86.7.2243] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Treatment of quiescent BALB/c mouse 3T3 cells with murine interferon alpha/beta (IFN-alpha/beta) (1000 units/ml) leads to the appearance at 4 hr of 1.7-kilobase 2',5'-oligoadenylate (2',5'-OAS)mRNA as detected by Northern blot analysis. This mRNA accumulates for at least 18 hr. Two protein kinase C activators, 1,2-dioctanoyl glycerol and phorbol 12-myristate 13-acetate, suppress, whereas the calcium ionophore ionomycin enhances, the IFN-alpha/beta-induced expression of 2',5'-OAS mRNA. The 8-bromo and dibutyryl analogs of cAMP and the adenylate cyclase activator forskolin did not affect the induction of 2',5'-OAS mRNA by IFN-alpha/beta. In the absence of IFN-alpha/beta, the above agents used either singly or in combinations, did not induce 2',5'-OAS mRNA expression nor did platelet-derived growth factor (1-2 units/ml), fibroblast growth factor (6-100 ng/ml), or bovine serum (10-20%). Bovine serum also did not affect 2',5'-OAS mRNA induction by IFN-alpha/beta. The poly(ADP)-ribose synthetase inhibitor 3-aminobenzamide suppressed IFN-alpha/beta-induced 2',5'-OAS gene expression. These results suggest that in quiescent BALB/c 3T3 cells (i) the 2',5'-OAS gene is not responsive to the three major signal transduction pathways activated by diacylglycerol, Ca2+, and cAMP; (ii) induction of the 2',5'-OAS gene by IFN-alpha/beta is decreased by activation of the protein kinase C pathway but enhanced by elevation of intracellular [Ca2+].
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Affiliation(s)
- C Yan
- Rockefeller University, New York, NY 10021
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37
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Blanar MA, Baldwin AS, Flavell RA, Sharp PA. A gamma-interferon-induced factor that binds the interferon response sequence of the MHC class I gene, H-2Kb. EMBO J 1989; 8:1139-44. [PMID: 2501084 PMCID: PMC400925 DOI: 10.1002/j.1460-2075.1989.tb03484.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Transcription of class I genes of the major histocompatibility complex (MHC) can be induced by interferons. Treatment of HeLa cells with interferon-gamma induces a DNA-binding factor, IBP-1, specific for a site within the interferon response sequence (IRS) of the H-2Kb promoter. The mol. wt of IBP-1, as estimated by photoactivated protein-DNA crosslinking analysis, is approximately 59 kd. Point-mutation of this binding site abolishes IBP-1 interaction and the ability of the MHC promoter to respond to interferon. Induction of this binding activity is rapid and closely parallels the previously reported time course of transcriptional activation of endogenous MHC class I genes. Treatment of cells with cycloheximide, a protein synthesis inhibitor, blocked the induction of the DNA-binding activity. An oligonucleotide derived from the virus- and double-stranded RNA-inducible promoter of the interferon-beta 1 gene is able to bind IBP-1. Sequences similar to the IBP-1 binding site are found upstream of many interferon-responsive genes.
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Affiliation(s)
- M A Blanar
- Biogen Research Corporation, Cambridge, MA 02142
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38
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Cohen B, Vaiman D, Chebath J. Enhancer functions and in vitro protein binding of native and mutated interferon-responsive sequences. Nucleic Acids Res 1989; 17:1679-95. [PMID: 2922289 PMCID: PMC331828 DOI: 10.1093/nar/17.4.1679] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Mutants of the Interferon responsive sequence (IRS) of the mouse and human (2'-5') A synthetase (moE-IRS and hE-IRS) were tested for their Interferon (IFN)-inducible enhancer functions and for protein binding in vitro. Two complexes R1 and R3, were formed specifically with the hE-IRS. R3 migrated much faster and was about ten times more abundant than R1. R1 and R3 are increased about 2-fold in IFN-treated HeLa extracts relatively to extracts from non-treated cells. R1 and R3 seem to involve the same DNA sequence in the probe since they react identically to competitors. Two proteins of 69 and 46 kDa form the IRS specific complexes as revealed by UV cross-linking. Identical DNA probes bearing either the hE-IRS or moE-IRS form complexes of different characteristics with nuclear proteins, suggesting that the two IRS variants are the targets of binding of different proteins or of different protein complexes.
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Affiliation(s)
- B Cohen
- Department of Virology, Weizmann Institute of Science, Rehovot, Israel
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39
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Organization of the murine Mx gene and characterization of its interferon- and virus-inducible promoter. Mol Cell Biol 1989. [PMID: 2974922 DOI: 10.1128/mcb.8.8.3065] [Citation(s) in RCA: 129] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Specific resistance of Mx+ mice to influenza virus is due to the interferon (IFN)-induced protein Mx. The Mx gene consists of 14 exons that are spread over at least 55 kilobase pairs of DNA. Surprisingly, the Mx gene promoter is induced as efficiently by Newcastle disease virus as it is by IFN. The 5' boundary of the region required for maximal induction by both IFN and Newcastle disease virus is located about 140 base pairs upstream of the cap site. This region contains five elements of the type GAAANN, which occurs in all IFN- and virus-inducible promoters. The consensus sequence purine-GAAAN(N/-)GAAA(C/G)-pyrimidine is found in all IFN-inducible promoters.
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40
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Doppler W, Groner B, Ball RK. Prolactin and glucocorticoid hormones synergistically induce expression of transfected rat beta-casein gene promoter constructs in a mammary epithelial cell line. Proc Natl Acad Sci U S A 1989; 86:104-8. [PMID: 2643093 PMCID: PMC286412 DOI: 10.1073/pnas.86.1.104] [Citation(s) in RCA: 164] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We have detected hormone response elements in the promoter region of the rat beta-casein gene that confer the synergistic action of prolactin and glucocorticoid hormones upon transcription of chimeric gene constructs. A 2800-base-pair (bp) rat beta-casein gene fragment containing 2300 bp of 5' flanking sequence was placed in front of a chloramphenicol acetyltransferase (CAT) reporter gene and stably transfected into the mouse mammary epithelial cell line HC11. Addition of prolactin or dexamethasone alone was sufficient for a modest induction of the fusion gene. The simultaneous presence of both hormones produced a strongly synergistic effect, which did not require the presence of insulin. Induction of the beta-casein-CAT gene was only observed in stably transfected confluent cell cultures. Analysis of a 5' deletion series of the beta-casein-CAT gene construct revealed a stepwise loss of hormone inducibility; 285 bp of 5' flanking sequence was sufficient to mediate the synergistic action of lactogenic hormones on expression. The response was reduced by half when compared with the construct containing 2300 bp of the 5' flanking region. Synergistic inducibility further decreased in deletion mutants between -285 and -265 and was completely abolished between -180 and -170. Thus, the 5' flanking region between -285 and -170 contains cis-acting sequences, which are required for mediating the effect of prolactin and dexamethasone.
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Affiliation(s)
- W Doppler
- Ludwig Institute for Cancer Research, Bern, Switzerland
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41
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Gene induction by interferons and double-stranded RNA: selective inhibition by 2-aminopurine. Mol Cell Biol 1988. [PMID: 2460741 DOI: 10.1128/mcb.8.10.4289] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Transcription of several interferon-inducible human genes is also induced by double-stranded RNA. The nature and the mechanism of action of signals generated by interferons and by double-stranded RNA which mediate the induction of these genes are under investigation. Here we report that 2-aminopurine, a known inhibitor of protein kinases, could selectively block this induction process. Induction of mRNAs 561 and 6-16 in HeLaM cells by double-stranded RNA was completely inhibited by 10 mM 2-aminopurine, whereas cellular protein and RNA syntheses as well as the induction of metallothionein mRNA by CdCl2 were unaffected by this inhibitor. In addition, 2-aminopurine blocked the induction of the same two mRNAs and of mRNAs 2-5(A) synthetase, 2A, and 1-8 by alpha interferon and of mRNAs 2A and 1-8 by gamma interferon in HeLaM cells. The observed inhibition was at the level of transcription, and for establishing efficient inhibition, the 2-aminopurine treatment had to begin at early stages of interferon treatment. In GM2767 cells, 2-aminopurine inhibited induction of mRNAs 561 and 6-16 by double-stranded RNA but not by alpha interferon. These results suggest that double-stranded RNA-induced signal 2 is distinct from the interferon-alpha-induced signal 2 (R. K. Tiwari, J. Kusari, and G. C. Sen, EMBO J. 6:3373-3378, 1987) and that 2-aminopurine can block the former but not the latter. Moreover, it appeared that 2-aminopurine could block the production of signal 1 by interferons. This was confirmed by experiments in which we separately tested the effects of 2-aminopurine on signal 1 and signal 2 production by interferons in HeLaM cells. Although no direct experimental evidence is available as yet, our results are consistent with the hypothesis that the functioning of a protein kinase activity may be necessary for transcriptional induction of genes by double-stranded RNA and for gene induction by interferons in those cells in which signal 1 production is needed.
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Tiwari RK, Kusari J, Kumar R, Sen GC. Gene induction by interferons and double-stranded RNA: selective inhibition by 2-aminopurine. Mol Cell Biol 1988; 8:4289-94. [PMID: 2460741 PMCID: PMC365501 DOI: 10.1128/mcb.8.10.4289-4294.1988] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Transcription of several interferon-inducible human genes is also induced by double-stranded RNA. The nature and the mechanism of action of signals generated by interferons and by double-stranded RNA which mediate the induction of these genes are under investigation. Here we report that 2-aminopurine, a known inhibitor of protein kinases, could selectively block this induction process. Induction of mRNAs 561 and 6-16 in HeLaM cells by double-stranded RNA was completely inhibited by 10 mM 2-aminopurine, whereas cellular protein and RNA syntheses as well as the induction of metallothionein mRNA by CdCl2 were unaffected by this inhibitor. In addition, 2-aminopurine blocked the induction of the same two mRNAs and of mRNAs 2-5(A) synthetase, 2A, and 1-8 by alpha interferon and of mRNAs 2A and 1-8 by gamma interferon in HeLaM cells. The observed inhibition was at the level of transcription, and for establishing efficient inhibition, the 2-aminopurine treatment had to begin at early stages of interferon treatment. In GM2767 cells, 2-aminopurine inhibited induction of mRNAs 561 and 6-16 by double-stranded RNA but not by alpha interferon. These results suggest that double-stranded RNA-induced signal 2 is distinct from the interferon-alpha-induced signal 2 (R. K. Tiwari, J. Kusari, and G. C. Sen, EMBO J. 6:3373-3378, 1987) and that 2-aminopurine can block the former but not the latter. Moreover, it appeared that 2-aminopurine could block the production of signal 1 by interferons. This was confirmed by experiments in which we separately tested the effects of 2-aminopurine on signal 1 and signal 2 production by interferons in HeLaM cells. Although no direct experimental evidence is available as yet, our results are consistent with the hypothesis that the functioning of a protein kinase activity may be necessary for transcriptional induction of genes by double-stranded RNA and for gene induction by interferons in those cells in which signal 1 production is needed.
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Affiliation(s)
- R K Tiwari
- Molecular Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021
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Organization of the murine Mx gene and characterization of its interferon- and virus-inducible promoter. Mol Cell Biol 1988; 8:3065-79. [PMID: 2974922 PMCID: PMC363533 DOI: 10.1128/mcb.8.8.3065-3079.1988] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Specific resistance of Mx+ mice to influenza virus is due to the interferon (IFN)-induced protein Mx. The Mx gene consists of 14 exons that are spread over at least 55 kilobase pairs of DNA. Surprisingly, the Mx gene promoter is induced as efficiently by Newcastle disease virus as it is by IFN. The 5' boundary of the region required for maximal induction by both IFN and Newcastle disease virus is located about 140 base pairs upstream of the cap site. This region contains five elements of the type GAAANN, which occurs in all IFN- and virus-inducible promoters. The consensus sequence purine-GAAAN(N/-)GAAA(C/G)-pyrimidine is found in all IFN-inducible promoters.
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Shirayoshi Y, Burke PA, Appella E, Ozato K. Interferon-induced transcription of a major histocompatibility class I gene accompanies binding of inducible nuclear factors to the interferon consensus sequence. Proc Natl Acad Sci U S A 1988; 85:5884-8. [PMID: 2457903 PMCID: PMC281869 DOI: 10.1073/pnas.85.16.5884] [Citation(s) in RCA: 123] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Interferon (IFN) induces transcription of major histocompatibility class I genes by way of the conserved cis-acting regulatory element, termed the IFN consensus sequence (ICS). Binding of nuclear factors to the ICS was studied in gel mobility shift assays with the 5' upstream region of the murine H-2Ld gene. We found that the ICS binds a constitutive nuclear factor present in lymphocytes and fibroblasts regardless of IFN treatment. Within 1 hr after IFN treatment, new ICS binding activity was induced, which consisted of at least two binding activities distinguished by their requirement for de novo protein synthesis. Methylation interference and competition experiments showed that both constitutive and induced factors bind to the same approximately equal to 10-base-pair binding site within the ICS. Site-directed mutagenesis of H-2Ld-chloramphenicol acetyltransferase fusion genes showed that mutations in the binding site, but not in other regions of the ICS, abolish transcriptional activation of class I genes by IFN, providing evidence that specific binding of nuclear factors to the ICS is an essential requirement for transcriptional induction. Finally, we show that IFN-inducible genes of various species share a sequence motif that is capable of competing for the nuclear factors identified here. We propose that specific protein binding to the conserved motif represents a basic mechanism of IFN-mediated transcriptional induction of a number of genes.
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Affiliation(s)
- Y Shirayoshi
- Laboratory of Developmental and Molecular Immunity, National Institute of Child Health and Human Development, Bethesda, MD 20892
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Cohen B, Peretz D, Vaiman D, Benech P, Chebath J. Enhancer-like interferon responsive sequences of the human and murine (2'-5') oligoadenylate synthetase gene promoters. EMBO J 1988; 7:1411-9. [PMID: 2457496 PMCID: PMC458391 DOI: 10.1002/j.1460-2075.1988.tb02958.x] [Citation(s) in RCA: 121] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The human (2'-5') oligo(A) synthetase gene contains two independent cis-acting DNA elements, A and B, which act as transcriptional enhancers. Element A alone is not activated by IFN treatment. Element B alone confers IFN-inducibility to the herpes tk promoter. Two murine (2'-5') oligo(A) synthetase genes were isolated and their promoter sequences show high conservation of element A and B. A synthetic oligonucleotide, containing 16 bp of the human element B, or 14 bp of the homologue murine element B, was linked to a TK-CAT construct. These oligonucleotides were shown to be sufficient to activate the TK promoter in the presence of IFN. When multiple repeats of the interferon-responsive sequence (E-IRS) were cloned in 5' of the TK promoter, the activation ratio was increased. In vitro, specific binding of nuclear protein(s) is observed to the radiolabelled synthetic human E-IRS. This binding is competed by the addition of cold synthetic mouse E-IRS or fragments of genomic DNA containing the E-IRS.
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Affiliation(s)
- B Cohen
- Department of Virology, Weizmann Institute of Science, Rehovot, Israel
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