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de Miguel D, Ramirez-Labrada A, Uranga I, Hidalgo S, Santiago L, Galvez EM, Arias M, Pardo J. Inflammatory cell death induced by cytotoxic lymphocytes: a dangerous but necessary liaison. FEBS J 2021; 289:4398-4415. [PMID: 34174027 DOI: 10.1111/febs.16093] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 05/09/2021] [Accepted: 06/25/2021] [Indexed: 01/20/2023]
Abstract
Cytotoxic lymphocytes (CLs), and more specifically Tc and NK cells, are the main executors of cell death in the immune system, playing a key role during both immunosurveillance and immunotherapy. These cells induce regulated cell death (RCD) by different mechanisms, being granular exocytosis and expression of death ligands the most prominent and best characterized ones. Apoptosis, a traditionally considered low-inflammatory type of cell death, has been accepted for years as the paradigm of RCD induced by CLs. However, several recent studies have demonstrated that NK cells and Tc cells can also induce more inflammatory forms of cell death, namely, necroptosis, pyroptosis, and ferroptosis. Activation of these highly inflammatory types of cell death appears to critically contribute to the activation of a successful antitumour immune response. Additionally, the role of specific cell death pathways in immunogenic cell death is still under intense debate, especially considering the interconnections with other inflammatory forms of cell death. These evidences, together with the advent of new cancer immunotherapies, highlight the necessity to deepen our understanding of the link between the cell death triggered by CLs and inflammation. This knowledge will be instrumental to maximize the antitumour potential of immunotherapies, minimizing deleterious effects associated with these treatments. In this review, we will briefly summarize the main features of apoptosis, necroptosis, pyroptosis and ferroptosis, to subsequently discuss the most recent evidences about the role of these RCD pathways during the elimination of cancer cells mediated by CLs and its modulation to increase the efficacy of cancer immunotherapy.
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Affiliation(s)
- Diego de Miguel
- Aragón Health Research Institute (IIS Aragón), Biomedical Research Centre of Aragón (CIBA), Zaragoza, Spain
| | - Ariel Ramirez-Labrada
- Unidad de Nanotoxicología e Inmunotoxicología (UNATI), Aragón Health Research Institute (IIS Aragón), Biomedical Research Centre of Aragón (CIBA), Zaragoza, Spain
| | - Iratxe Uranga
- Aragón Health Research Institute (IIS Aragón), Biomedical Research Centre of Aragón (CIBA), Zaragoza, Spain
| | - Sandra Hidalgo
- Aragón Health Research Institute (IIS Aragón), Biomedical Research Centre of Aragón (CIBA), Zaragoza, Spain
| | - Llipsy Santiago
- Aragón Health Research Institute (IIS Aragón), Biomedical Research Centre of Aragón (CIBA), Zaragoza, Spain
| | | | - Maykel Arias
- Instituto de Carboquímica ICB-CSIC, Zaragoza, Spain
| | - Julián Pardo
- Aragón Health Research Institute (IIS Aragón), Biomedical Research Centre of Aragón (CIBA), Zaragoza, Spain.,Department of Microbiology, Preventive Medicine and Public Health, University of Zaragoza, Spain.,Aragón I + D Foundation (ARAID), Government of Aragon, Zaragoza, Spain
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2
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ÖZTÜRK Ş, DURMAZ B, MEMMEDOV H, OKTAY LM, GÜNEL SN, OLUKMAN M, SÖZMEN EY. Ferulik asitin lipopolisakkaridaz ile induklenmiş insan lösemi monositik hücrelerinde sitokin salınımına etkisi. EGE TIP DERGISI 2021. [DOI: 10.19161/etd.887360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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3
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Testa C, DI Lorenzo A, Parlato A, D'Ambrosio G, Merolla A, Pacileo M, Iannuzzo G, Gentile M, Nugara C, Sarullo FM, DE Gregorio C, D'Andrea A, Vigorito C, Venturini E, Giallauria F. Exercise for slowing the progression of atherosclerotic process: effects on inflammatory markers. Panminerva Med 2021; 63:122-132. [PMID: 33565757 DOI: 10.23736/s0031-0808.21.04266-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Atherosclerosis is a dynamic process driven by all cardiovascular risk factors that can be briefly divided into an early and a late phase. Inflammation is one of the fundamental substrates that initiates the atherosclerotic process in the early stages and promotes and maintains it in the final stages. In the last decades, clinical and experimental data have shown that inflammation is supported by mediators that respond to physical activity. The present review aimed at investigating the effect of physical exercise on inflammatory mediators, both the positive ones that have a proinflammatory effect (interleukin 6, c-reactive protein and tumor necrosis factor α, interferon γ, high-mobility group box-1), and the negative ones which have an anti-inflammatory effect (interleukin 10). Pooled data support the evidence that physical exercise can directly modulate the activity of inflammatory cytokines slowing down or preventing the formation of the atherosclerotic stage.
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Affiliation(s)
- Crescenzo Testa
- Department of Translational Medical Sciences, Federico II University, Naples, Italy
| | - Anna DI Lorenzo
- Department of Translational Medical Sciences, Federico II University, Naples, Italy
| | - Alessandro Parlato
- Department of Translational Medical Sciences, Federico II University, Naples, Italy
| | - Giuseppe D'Ambrosio
- Department of Translational Medical Sciences, Federico II University, Naples, Italy
| | - Aurora Merolla
- Department of Translational Medical Sciences, Federico II University, Naples, Italy
| | - Mario Pacileo
- Unit of Cardiology and Intensive Care, "Umberto I" Hospital, Nocera Inferiore, Salerno, Italy
| | - Gabriella Iannuzzo
- Department of Clinical Medicine and Surgery, Federico II University, Naples, Italy
| | - Marco Gentile
- Department of Clinical Medicine and Surgery, Federico II University, Naples, Italy
| | - Cinzia Nugara
- Unit of Cardiovascular Rehabilitation, Buccheri La Ferla Fatebenefratelli Hospital, Palermo, Italy
| | - Filippo M Sarullo
- Unit of Cardiovascular Rehabilitation, Buccheri La Ferla Fatebenefratelli Hospital, Palermo, Italy
| | - Cesare DE Gregorio
- Unit of Cardiology, Department of Clinical and Experimental Medicine, University Hospital of Messina, Messina, Italy.,Post-graduate Residency School in Cardiovascular Diseases, Department of Clinical and Experimental Medicine, University Hospital of Messina, Messina, Italy
| | - Antonello D'Andrea
- Unit of Cardiology and Intensive Care, "Umberto I" Hospital, Nocera Inferiore, Salerno, Italy
| | - Carlo Vigorito
- Department of Translational Medical Sciences, Federico II University, Naples, Italy
| | - Elio Venturini
- Cardiac Rehabilitation Unit, AUSL Toscana Nord-Ovest, Cecina Civil Hospital, Cecina, Livorno, Italy
| | - Francesco Giallauria
- Department of Translational Medical Sciences, Federico II University, Naples, Italy - .,Faculty of Sciences and Technology, University of New England, Armidale, Australia
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4
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Moon SK, Woo JI, Lim DJ. Involvement of TNF-α and IFN-γ in Inflammation-Mediated Cochlear Injury. Ann Otol Rhinol Laryngol 2019; 128:8S-15S. [DOI: 10.1177/0003489419837689] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Objectives: Inflammation is crucial for the pathogenesis of acquired sensorineural hearing loss, but the precise mechanism involved remains elusive. Among a number of inflammatory mediators, tumor necrosis factor-alpha (TNF-α) plays a pivotal role in cisplatin ototoxicity. However, TNF-α alone is cytotoxic to cochlear sensory cells only at the extremely high concentrations, suggesting the involvement of other factors that may sensitize cells to TNF-α cytotoxicity. Since interferon gamma (IFN-γ) importantly contributes to the cochlear inflammatory processes, we aim to determine whether and how IFN-γ affects TNF-α cytotoxicity to cochlear sensory cells. Methods: TNF-α expression was determined with western blotting in RSL cells and immunolabeling of mouse temporal bone sections. HEI-OC1 cell viability was determined with MTT assays, cytotoxicity assays, and cytometric analysis with methylene blue staining. Cochlear sensory cell injury was determined in the organotypic culture of the mouse organ of Corti. Results: Spiral ligament fibrocytes were shown to upregulate TNF-α in response to pro-inflammatory stimulants. We demonstrated IFN-γ increases the susceptibility of HEI-OC1 cells to TNF-α cytotoxicity via JAK1/2-STAT1 signaling. TNFR1-mediated Caspase-1 activation was found to mediate the sensitization effect of IFN-γ on TNF-α cytotoxicity. The combination of IFN-γ and TNF-α appeared to augment cisplatin cytotoxicity to cochlear sensory cells ex vivo. Conclusions: Taken together, these findings suggest the involvement of IFN-γ in the sensitization of cochlear cells to TNF-α cytotoxicity, which would enable us to better understand the complex mechanisms underlying inflammation-mediated cochlear injury.
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Affiliation(s)
- Sung K. Moon
- Department of Head and Neck Surgery, David Geffen School of Medicine, UCLA, Los Angeles, California, USA
| | - Jeong-Im Woo
- Department of Head and Neck Surgery, David Geffen School of Medicine, UCLA, Los Angeles, California, USA
| | - David J. Lim
- Department of Head and Neck Surgery, David Geffen School of Medicine, UCLA, Los Angeles, California, USA
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Regulation of human formyl peptide receptor 1 synthesis: role of single nucleotide polymorphisms, transcription factors, and inflammatory mediators. PLoS One 2011; 6:e28712. [PMID: 22174875 PMCID: PMC3235167 DOI: 10.1371/journal.pone.0028712] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Accepted: 11/14/2011] [Indexed: 01/19/2023] Open
Abstract
The gene encoding the human formyl peptide receptor 1 (FPR1) is heterogeneous, containing numerous single nucleotide polymorphisms (SNPs). Here, we examine the effect of these SNPs on gene transcription and protein translation. We also identify gene promoter sequences and putative FPR1 transcription factors. To test the effect of codon bias and codon pair bias on FPR1 expression, four FPR1 genetic variants were expressed in human myeloid U937 cells fused to a reporter gene encoding firefly luciferase. No significant differences in luciferase activity were detected, suggesting that the translational regulation and protein stability of FPR1 are modulated by factors other than the SNP codon bias and the variant amino acid properties. Deletion and mutagenesis analysis of the FPR1 promoter showed that a CCAAT box is not required for gene transcription. A −88/41 promoter construct resulted in the strongest transcriptional activity, whereas a −72/41 construct showed large reduction in activity. The region between −88 and −72 contains a consensus binding site for the transcription factor PU.1. Mutagenesis of this site caused significant reduction in reporter gene expression. The PU.1 binding was confirmed in vivo by chromatin immunoprecipitation, and the binding to nucleotides −84 to −76 (TTCCTATTT) was confirmed in vitro by an electrophoretic mobility shift assay. Thus, similar to many other myeloid genes, FPR1 promoter activity requires PU.1. Two single nucleotide polymorphisms at −56 and −54 did not significantly affect FPR1 gene expression, despite differences in binding of transcription factor IRF1 in vitro. Inflammatory mediators such as interferon-γ, tumor necrosis factor-α, and lipopolysaccharide did not increase FPR1 promoter activity in myeloid cells, whereas differentiation induced by DMSO and retinoic acid enhanced the activity. This implies that the expression of FPR1 in myeloid cells is developmentally regulated, and that the differentiated cells are equipped for immediate response to microbial infections.
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Orbach A, Rachmilewitz J, Shani N, Isenberg Y, Parnas M, Huang JH, Tykocinski ML, Dranitzki-Elhalel M. CD40·FasL and CTLA-4·FasL fusion proteins induce apoptosis in malignant cell lines by dual signaling. THE AMERICAN JOURNAL OF PATHOLOGY 2010; 177:3159-68. [PMID: 21088216 DOI: 10.2353/ajpath.2010.100301] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Evolution of apoptosis resistance in both lymphoma and leukemia cells is well documented, and induction of apoptosis in malignant cells is a major goal of cancer therapy. Up-regulation of anti-apoptotic signals is one of the mechanisms whereby resistance to apoptosis emerges. We have previously described the fusion proteins CD40·FasL and CTLA-4·FasL, which are formed from two functional membrane proteins and induce apoptosis of activated T cells. The present study explores the potential use of CD40·FasL and CTLA-4·FasL for the killing of malignant cells of lymphatic origin. Using malignant B and T cell lines that differ in surface expression of costimulatory molecules, we found that CTLA-4·FasL induces effective apoptosis of cells expressing CD95 and activates caspases 3, 8, and 9. Only B7-expressing B cells responded to CTLA-4·FasL with rapid abrogation of cFLIP expression. CD40·FasL effectively killed only the T cells that express high levels of CD40L in addition to CD95. In these cells, CD40·FasL significantly diminished cFLIP expression. Importantly, each of the fusion proteins is more potent than its respective components parts, alone or in combination. Thus, the proteins with their two functional ends deliver a pro-apoptotic signal and, in parallel, inhibit an anti-apoptotic signal, thus optimizing the wanted, death-inducing effect. Therefore, these proteins emerge as promising agents to be used for targeted and specific tumor cell killing.
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Affiliation(s)
- Ariel Orbach
- Nephrology and Hypertension Services, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel
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7
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RasV12 induces Survivin/AuroraB pathway conferring tumor cell apoptosis resistance. Cell Signal 2010; 22:1214-21. [DOI: 10.1016/j.cellsig.2010.03.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Revised: 03/24/2010] [Accepted: 03/24/2010] [Indexed: 12/13/2022]
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8
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Coppola D, Parikh V, Boulware D, Blanck G. Substantially reduced expression of PIAS1 is associated with colon cancer development. J Cancer Res Clin Oncol 2009; 135:1287-91. [PMID: 19288270 DOI: 10.1007/s00432-009-0570-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Accepted: 02/23/2009] [Indexed: 01/04/2023]
Abstract
PURPOSE Protein inhibitors of activated STATs (PIAS) regulate the interferon-gamma (IFN-gamma) signaling pathway, which has numerous effects on tumor development and tumor cell biology. PIAS's also regulate STAT family members not directly involved in IFN-gamma signaling. This project was designed to assess PIAS1 expression in colon cancer. METHODS To determine whether PIAS1, one of the PIAS family members, or IFN-gamma signaling pathway components could be used to stratify colon tumors, we stained tissue microarrays for PIAS1, interferon regulatory factor-1 (IRF-1) and STAT1alpha. RESULTS PIAS1 staining of the colon cancer tissue microarrays indicated a strong correlation of normal colon cells, and adenomas, with high expression of both PIAS1 and IRF-1. CONCLUSION The PIAS1 results in particular may represent a basis for new approaches for efficiently distinguishing adenomas from colon cancer.
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Affiliation(s)
- Domenico Coppola
- Department of Anatomic Pathology, H Lee Moffitt Cancer Center and Research Institute, Tampa, USA.
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9
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Li NN, Liu P, Chen SJ, Lin QP, Zhou LF, Zhang SQ. Construction and expression of a novel bioactive IFN-alpha2b/CM4 fusion protein in Escherichia coli. Microbiol Res 2009; 165:116-21. [PMID: 19246180 DOI: 10.1016/j.micres.2009.01.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2008] [Revised: 12/27/2008] [Accepted: 01/10/2009] [Indexed: 01/31/2023]
Abstract
Human interferon alpha2b (IFN-alpha2b) is a pleiotropic cytokine used for the treatment of various cancers. Antibacterial peptide CM4 is a small peptide that can strongly inhibit many kinds of bacteria, fungi, and tumor cells, but it does no harm to normal cells. Here, we describe a protein expression system for the production of IFN-alpha2b/CM4 fusion protein in insoluble form in Escherichia coli, coupled to an efficient dialysis refolding and histidine-tag purification protocol. The expressed IFN-alpha2b/CM4 fusion protein not only displays significantly improved antitumor activity, but also retains the antibacterial-antifungal activity of CM4.
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Affiliation(s)
- Nan-Nan Li
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, Life Sciences College, Nanjing Normal University, Nanjing 210046, China
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10
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Kolinska J, Lisa V, Clark JA, Kozakova H, Zakostelecka M, Khailova L, Sinkora M, Kitanovicova A, Dvorak B. Constitutive expression of IL-18 and IL-18R in differentiated IEC-6 cells: effect of TNF-alpha and IFN-gamma treatment. J Interferon Cytokine Res 2008; 28:287-96. [PMID: 18547159 DOI: 10.1089/jir.2006.0130] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The multifunctional cytokine interleukin-18 (IL-18) is an important mediator in intestinal inflammatory processes. The aim of this study was to evaluate the constitutive expression of IL-18 and its receptors (IL-18Ralpha and IL-18Rbeta) in intestinal epithelial cells (IEC) stimulated by tumor necrosis factor-alpha (TNF-alpha) and interferon-gamma (IFN-gamma). In addition, cellular proliferation and evaluation of brush border enzymes as differentiation markers were studied. Nontransformed rat intestinal epithelial IEC-6 cells were grown on an extracellular matrix (ECM) in medium with or without TNF-alpha, IFN-gamma, or a combination of both. Gene expression of IL-18, its receptors and apoptotic markers was evaluated using real-time PCR. Expression of IL-18Ralpha protein was demonstrated by flow cytometry and Western blot. Enzymatic activities of brush border enzymes and caspase-1 were determined. The constitutive expression of IL-18, IL-18Ralpha and IL-18Rbeta mRNAs and proteins were detected in IEC-6 cells. The biologically active form of IL-18 was released in response to TNF-alpha and IFN-gamma treatment. Exogenous IL-18 had no effect on cellular proliferation, brush border enzyme activities, and gene expression of apoptotic markers. However, the addition of IL-18 stimulated production and release of the chemokine IL-8. These data suggest that IEC-6 cells may be not only a source of IL-18 but also a target for its action.
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Affiliation(s)
- Jirina Kolinska
- Institute of Physiology of the Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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McLaren JE, Ramji DP. Interferon gamma: a master regulator of atherosclerosis. Cytokine Growth Factor Rev 2008; 20:125-35. [PMID: 19041276 DOI: 10.1016/j.cytogfr.2008.11.003] [Citation(s) in RCA: 170] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Atherosclerosis is a chronic inflammatory disease that is characterized by the development of fibrotic plaques in the arterial wall. The disease exhibits a complex aetiology and its progression is influenced by a number of environmental and genetic risk factors. The cytokine interferon-gamma (IFN-gamma), a key regulator of immune function, is highly expressed in atherosclerotic lesions and has emerged as a significant factor in atherogenesis. Evidence from both mouse models of atherosclerosis and in vitro cell culture has suggested that the role of IFN-gamma is complex since both pro- and anti-atherogenic actions have been affiliated to it. This review will focus on evaluating the contribution of IFN-gamma to atherosclerosis and, in particular, how it regulates immune responses to the disease.
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Affiliation(s)
- James E McLaren
- Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK.
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12
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Pietrzak AT, Zalewska A, Chodorowska G, Krasowska D, Michalak-Stoma A, Nockowski P, Osemlak P, Paszkowski T, Roliński JM. Cytokines and anticytokines in psoriasis. Clin Chim Acta 2008; 394:7-21. [PMID: 18445484 DOI: 10.1016/j.cca.2008.04.005] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2007] [Revised: 03/31/2008] [Accepted: 04/04/2008] [Indexed: 12/13/2022]
Abstract
BACKGROUND Psoriasis is a chronic autoimmune hyperproliferative skin disease of varying severity affecting approximately 2-3% of the general population in the USA and Europe. Although the pathogenesis of psoriasis has not been fully elucidated, an immunologic-genetic relationship is likely. Cutaneous and systemic overexpression of various proinflammatory cytokines (TNF, interleukins, interferon-gamma) has been demonstrated in psoriatic patients. METHODS We reviewed the current database literature and summarized the involvement of cytokines and their receptors in the pathogenesis and treatment of psoriasis. RESULTS Although many cytokine/anti-cytokine therapies have been conducted, TNF antagonists in the treatment of both psoriasis arthropatica and vulgaris appear to be the most widely used clinically. Interestingly, the efficacy and tolerability of some cytokines (rhIL-11 or ABX-IL-8,) were found to be much lower than expected. CONCLUSIONS Preliminary results obtained with cytokine and anti-cytokine therapies appear promising and as such continued research is clearly indicated.
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Affiliation(s)
- Aldona T Pietrzak
- Chair and Department of Dermatology, Medical University of Lublin, Poland.
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Randall RE, Goodbourn S. Interferons and viruses: an interplay between induction, signalling, antiviral responses and virus countermeasures. J Gen Virol 2008; 89:1-47. [PMID: 18089727 DOI: 10.1099/vir.0.83391-0] [Citation(s) in RCA: 1203] [Impact Index Per Article: 75.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The interferon (IFN) system is an extremely powerful antiviral response that is capable of controlling most, if not all, virus infections in the absence of adaptive immunity. However, viruses can still replicate and cause disease in vivo, because they have some strategy for at least partially circumventing the IFN response. We reviewed this topic in 2000 [Goodbourn, S., Didcock, L. & Randall, R. E. (2000). J Gen Virol 81, 2341-2364] but, since then, a great deal has been discovered about the molecular mechanisms of the IFN response and how different viruses circumvent it. This information is of fundamental interest, but may also have practical application in the design and manufacture of attenuated virus vaccines and the development of novel antiviral drugs. In the first part of this review, we describe how viruses activate the IFN system, how IFNs induce transcription of their target genes and the mechanism of action of IFN-induced proteins with antiviral action. In the second part, we describe how viruses circumvent the IFN response. Here, we reflect upon possible consequences for both the virus and host of the different strategies that viruses have evolved and discuss whether certain viruses have exploited the IFN response to modulate their life cycle (e.g. to establish and maintain persistent/latent infections), whether perturbation of the IFN response by persistent infections can lead to chronic disease, and the importance of the IFN system as a species barrier to virus infections. Lastly, we briefly describe applied aspects that arise from an increase in our knowledge in this area, including vaccine design and manufacture, the development of novel antiviral drugs and the use of IFN-sensitive oncolytic viruses in the treatment of cancer.
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Affiliation(s)
- Richard E Randall
- School of Biology, University of St Andrews, The North Haugh, St Andrews KY16 9ST, UK
| | - Stephen Goodbourn
- Division of Basic Medical Sciences, St George's, University of London, London SW17 0RE, UK
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Lu J, Peng Y, Zheng Z, Pan J, Zhang Y, Bai Y. EGF-IL-18 fusion protein as a potential anti-tumor reagent by induction of immune response and apoptosis in cancer cells. Cancer Lett 2008; 260:187-97. [DOI: 10.1016/j.canlet.2007.10.042] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2007] [Revised: 10/21/2007] [Accepted: 10/30/2007] [Indexed: 01/21/2023]
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Abstract
Tumour necrosis factor-alpha (TNF-alpha) is a cytokine that is involved in many functions, including the inflammatory response, immunity and apoptosis. Some of the responses of TNF-alpha are mediated by caspase-1, which is involved in the production of the pro-inflammatory cytokines interleukin-1beta, interleukin-18 and interleukin-33. The molecular mechanisms involved in TNF-alpha-induced caspase-1 gene expression remain poorly defined, despite the fact that signaling by TNF-alpha has been well studied. The present study was undertaken to investigate the mechanisms involved in the induction of caspase-1 gene expression by TNF-alpha. Treatment of A549 cells with TNF-alpha resulted in an increase in caspase-1 mRNA and protein expression, which was preceded by an increase in interferon regulatory factor-1 and p73 protein levels. Caspase-1 promoter reporter was activated by the treatment of cells with TNF-alpha. Mutation of the interferon regulatory factor-1 binding site resulted in the almost complete loss of basal as well as of TNF-alpha-induced caspase-1 promoter activity. Mutation of the p53/p73 responsive site resulted in reduced TNF-alpha-induced promoter activity. Blocking of p73 function by a dominant negative mutant or by a p73-directed small hairpin RNA reduced basal as well as TNF-alpha-induced caspase-1 promoter activity. TNF-alpha-induced caspase-1 mRNA and protein levels were reduced when p73 mRNA was down-regulated by small hairpin RNA. Caspase-5 gene expression was induced by TNF-alpha, which was inhibited by the small hairpin RNA-mediated down-regulation of p73. Our results show that TNF-alpha induces p73 gene expression, which, together with interferon regulatory factor-1, plays an important role in mediating caspase-1 promoter activation by TNF-alpha.
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Affiliation(s)
- Nishant Jain
- Centre for Cellular and Molecular Biology, Hyderabad, India
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16
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Meister N, Shalaby T, von Bueren AO, Rivera P, Patti R, Oehler C, Pruschy M, Grotzer MA. Interferon-gamma mediated up-regulation of caspase-8 sensitizes medulloblastoma cells to radio- and chemotherapy. Eur J Cancer 2007; 43:1833-41. [PMID: 17627812 DOI: 10.1016/j.ejca.2007.05.028] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2006] [Revised: 04/12/2007] [Accepted: 05/29/2007] [Indexed: 11/24/2022]
Abstract
Loss of caspase-8 expression - which has been demonstrated in a subset of Medulloblastoma (MB) - might block important apoptotic signalling pathways and therefore contribute to treatment resistance. In this study, IFN-gamma mediated up-regulation of caspase-8 in human MB cells was found to result in chemosensitization to cisplatin, doxorubicin and etoposide, and sensitisation to radiation. These effects were more prominent in D425 and D341 MB cells (low basal caspase-8 expression) when compared to DAOY MB cells (high basal caspase-8 expression). IFN-gamma mediated chemosensitization and radiosensitization effects were reduced by treatment with the caspase-8 specific inhibitor z-IETD-fmk. Treatment of IFN-gamma resulted in activation of STAT1 in DAOY MB cells and to a lesser extent in D425, but not in D341, indicating that IFN-gamma acts in MB cells through STAT1-dependent and -independent signalling pathways. Taken together, our results demonstrate that IFN-gamma mediated restoration of caspase-8 in MB cells might enhance apoptotic pathways relevant to the response to chemo- and radiotherapy.
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Affiliation(s)
- N Meister
- Neuro-Oncology Program, University Children's Hospital of Zurich, Steinwiesstrasse 75, 8032 Zurich, Switzerland
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17
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López-Castejón G, Sepulcre MP, Mulero I, Pelegrín P, Meseguer J, Mulero V. Molecular and functional characterization of gilthead seabream Sparus aurata caspase-1: the first identification of an inflammatory caspase in fish. Mol Immunol 2007; 45:49-57. [PMID: 17610954 DOI: 10.1016/j.molimm.2007.05.015] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Revised: 05/14/2007] [Accepted: 05/15/2007] [Indexed: 10/23/2022]
Abstract
Caspases are a family of cysteine proteases that fulfil critical roles in mammalian apoptosis and in the proteolytic activation of cytokines. In humans, the caspase family includes 13 members whose functions seem to correlate with their phylogenetic relationship. They are classified into two main groups, the cell death (apoptotic) and the inflammatory caspases. Caspase-1 is the best characterized inflammatory caspase and is responsible for the processing of interleukin-1beta (IL-1beta), IL-18 and IL-33. Despite the importance of caspase-1 in inflammation, no information is available on the presence and activity of this enzyme in fish. In this study, we cloned a caspase-1-like gene from the bony fish gilthead seabream (Sparus aurata L.) which shows a conserved N-terminal caspase-recruitment domain (CARD) and a C-terminal caspase catalytic domain. The seabream caspase-1 gene was expressed in 1 day post-hatching larvae and its mRNA levels increased throughout development. In adult fish, caspase-1 was found to be constitutively expressed in all immune tissues analyzed and, unexpectedly, infection of fish and stimulation of professional phagocytes in vitro decreased its mRNA levels. It was also demonstrated that the recombinant seabream caspase-1 ectopically expressed in HEK293 cells was able to cleave a caspase-1 specific substrate, this activity being enhanced upon activation of the rat P2X7 receptor with BzATP. Finally, seabream fibroblast cell line SAF-1 and primary leukocytes showed endogenous caspase-1 activity, which was almost completely inhibited by a caspase-1 specific inhibitor.
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Affiliation(s)
- Gloria López-Castejón
- Department of Cell Biology, Faculty of Biology, University of Murcia, 30100 Murcia, Spain
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18
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Cuesta N, Nhu QM, Zudaire E, Polumuri S, Cuttitta F, Vogel SN. IFN Regulatory Factor-2 Regulates Macrophage Apoptosis through a STAT1/3- and Caspase-1-Dependent Mechanism. THE JOURNAL OF IMMUNOLOGY 2007; 178:3602-11. [PMID: 17339457 DOI: 10.4049/jimmunol.178.6.3602] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
IFN regulatory factor (IRF)-2(-/-) mice are significantly more resistant to LPS challenge than wild-type littermates, and this was correlated with increased numbers of apoptotic Kupffer cells. To assess the generality of this observation, and to understand the role of IRF-2 in apoptosis, responses of peritoneal macrophages from IRF-2(+/+) and IRF-2(-/-) mice to apoptotic stimuli, including the fungal metabolite, gliotoxin, were compared. IRF-2(-/-) macrophages exhibited a consistently higher incidence of apoptosis that failed to correlate with caspase-3/7 activity. Using microarray gene expression profiling of liver RNA samples derived from IRF-2(+/+) and IRF-2(-/-) mice treated with saline or LPS, we identified >40 genes that were significantly down-regulated in IRF-2(-/-) mice, including Stat3, which has been reported to regulate apoptosis. Compared with IRF-2(+/+) macrophages, STAT3alpha mRNA was up-regulated constitutively or after gliotoxin treatment of IRF-2(-/-) macrophages, whereas STAT3beta mRNA was down-regulated. Phospho-Y705-STAT3, phospho-S727-STAT1, and phospho-p38 protein levels were also significantly higher in IRF-2(-/-) than control macrophages. Activation of the STAT signaling pathway has been shown to elicit expression of CASP1 and apoptosis. IRF-2(-/-) macrophages exhibited increased basal and gliotoxin-induced caspase-1 mRNA expression and enhanced caspase-1 activity. Pharmacologic inhibition of STAT3 and caspase-1 abolished gliotoxin-induced apoptosis in IRF-2(-/-) macrophages. A novel IFN-stimulated response element, identified within the murine promoter of Casp1, was determined to be functional by EMSA and supershift analysis. Collectively, these data support the hypothesis that IRF-2 acts as a transcriptional repressor of Casp1, and that the absence of IRF-2 renders macrophages more sensitive to apoptotic stimuli in a caspase-1-dependent process.
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Affiliation(s)
- Natalia Cuesta
- Department of Microbiology and Immunology, University of Maryland School of Medicine, 600 West Baltimore Street, Baltimore, MD 21201, USA
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19
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Ersvaer E, Skavland J, Ulvestad E, Gjertsen BT, Bruserud Ø. Effects of interferon gamma on native human acute myelogenous leukaemia cells. Cancer Immunol Immunother 2007; 56:13-24. [PMID: 16612597 PMCID: PMC11030278 DOI: 10.1007/s00262-006-0159-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Accepted: 03/14/2006] [Indexed: 11/29/2022]
Abstract
T cell targeting immunotherapy is now considered a possible strategy in acute myelogenous leukaemia (AML), and IFNgamma release may then contribute to the antileukaemic effects. We investigated the effects of IFNgamma on native human AML cells. Normal T cells could be activated to release IFNgamma in the presence of AML cells. Furthermore, high levels of CD119 (IFNgamma receptor alpha chain) expression were observed for all 39 patients examined. Receptor expression was decreased after exposure to exogenous IFNgamma, and receptor ligation caused Stat1 phosphorylation but no phosphorylation of the alternative messengers Erk1/2. The effect of exogenous IFNgamma on AML blast proliferation was dependent on the local cytokine network and IFNgamma (1) inhibited proliferation in the presence of exogenous IL1beta, GM-CSF, G-CSF and SCF; (2) had divergent effects in the presence of IL3 and Flt3 (65 patients examined); (3) inhibited proliferation in the presence of endothelial cells but had divergent effects in the presence of fibroblasts, osteoblasts and normal stromal cells (65 patients examined). IFNgamma increased stress-induced (spontaneous) in vitro apoptosis as well as cytarabine-induced apoptosis only for a subset of patients. Furthermore, IFNgamma decreased the release of proangiogenic CXCL8 and increased the release of antiangiogenic CXCL9-11. We conclude that IFNgamma can be released in the presence of native human AML cells and affect AML cell proliferation, regulation of apoptosis and the balance between pro- and antiangiogenic chemokine release.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Apoptosis/drug effects
- Cell Proliferation
- Chemokine CXCL9
- Chemokines, CXC/metabolism
- Cytarabine/pharmacology
- Endothelium, Vascular/cytology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Female
- Fibroblasts/drug effects
- Fibroblasts/metabolism
- Flow Cytometry
- Granulocyte Colony-Stimulating Factor/metabolism
- Granulocyte-Macrophage Colony-Stimulating Factor/metabolism
- Humans
- Interferon-gamma/metabolism
- Interferon-gamma/pharmacology
- Interleukin-1beta/metabolism
- Interleukin-3/metabolism
- Interleukin-8/metabolism
- Leukemia, Lymphoid/drug therapy
- Leukemia, Lymphoid/metabolism
- Leukemia, Lymphoid/pathology
- Leukemia, Myeloid/drug therapy
- Leukemia, Myeloid/metabolism
- Leukemia, Myeloid/pathology
- Lymphocyte Activation/drug effects
- Male
- Middle Aged
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3/metabolism
- Osteoblasts/drug effects
- Osteoblasts/metabolism
- Phosphorylation
- Receptors, Interferon/metabolism
- STAT1 Transcription Factor/metabolism
- Signal Transduction
- Stromal Cells/drug effects
- Stromal Cells/metabolism
- T-Lymphocytes/metabolism
- Tumor Cells, Cultured
- fms-Like Tyrosine Kinase 3/metabolism
- Interferon gamma Receptor
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Affiliation(s)
- Elisabeth Ersvaer
- Institute of Medicine, Section for Hematology, The University of Bergen and Haukeland University Hospital, Bergen, Norway.
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20
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Conti L, Regis G, Longo A, Bernabei P, Chiarle R, Giovarelli M, Novelli F. In the absence of IGF-1 signaling, IFN-gamma suppresses human malignant T-cell growth. Blood 2006; 109:2496-504. [PMID: 17148586 DOI: 10.1182/blood-2006-07-034231] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Several approaches to target insulin-like growth factor-1 (IGF-1) signaling have resulted in the inhibition of the growth of a broad range of tumor cells. Malignant T cells are insensitive to the antiproliferative effects of the interferon-gamma (IFN-gamma)/signal transducer and activator of transcription 1 (STAT1) pathway because of the IGF-1-dependent internalization of the IFN-gammaR2 signaling chain. Here we show that human malignant T cells are also resistant to the growth inhibitory effect of both the IGF-1 receptor-specific inhibitor picropodophyllin (PPP) and retrovirus-mediated gene transfer of a dominant negative IGF-1 receptor. However, blockade of IGF-1 receptor perturbs IFN-gammaR2 internalization and induces its cell surface accumulation in malignant T cells. This allows the reinstatement of the IFN-gamma-induced STAT1 activation, a high expression of proapoptotic molecules, and the suppression of malignant T-cell growth both in vitro and in vivo in a severe combined immunodeficiency (SCID) mouse model. These data indicate that the inhibition of IGF-1 signaling combined with IFN-gamma administration could be a promising approach to suppress the growth of neoplastic T cells resistant to each treatment on its own.
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Affiliation(s)
- Laura Conti
- Center for Experimental Research and Medical Studies (CERMS), San Giovanni Battista Hospital, Turin, Italy
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21
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Watson GA, Queiroz de Oliveira PE, Stang MT, Armstrong MJ, Gooding WE, Kuan SF, Yim JH, Hughes SJ. Ad-IRF-1 induces apoptosis in esophageal adenocarcinoma. Neoplasia 2006; 8:31-7. [PMID: 16533423 PMCID: PMC1584287 DOI: 10.1593/neo.05559] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The nuclear transcription factor interferon regulatory factor-1 (IRF-1) is a putative tumor suppressor, but the expression and function of IRF-1 in esophageal adenocarcinoma (EA) remain unknown. We hypothesized that IRF-1 expression was reduced or lost in EA and that restoration of IRF-1 would result in the apoptosis of EA cells in vitro and the inhibition of tumor growth in vivo. Three EA cell lines were used to examine IRF-1 expression, IFN-gamma responsiveness, and the effects of IRF-1 overexpression using a recombinant adenoviral vector (Ad-IRF-1). All three EA cell lines produced IRF-1 protein following IFN-gamma stimulation, although IFN-gamma did not induce cell death. In contrast, Ad-IRF-1 infection resulted in high levels of IRF-1 protein and triggered apoptosis in all three EA cell lines. Potential mechanisms for the differential response to IFN-gamma versus Ad-IRF-1--such as modulation of c-Met or extracellular regulated kinase signaling, or altered expression of IRF-2, Fas, or survivin--were investigated, but none of these mechanisms can account for this observation. In vivo administration of IRF-1 in a murine model of EA modestly inhibited tumor growth, but did not lead to tumor regression. Strategies aimed at increasing or restoring IRF-1 expression may have therapeutic benefits in EA.
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Affiliation(s)
- Gregory A Watson
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA, USA
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22
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Sun QH, Peng JP, Xia HF. IFNγ pretreatment sensitizes human choriocarcinoma cells to etoposide-induced apoptosis. ACTA ACUST UNITED AC 2006; 12:99-105. [PMID: 16467399 DOI: 10.1093/molehr/gah250] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Choriocarcinoma is a malignant trophoblast-derived tumour, which can arise in any type of gestation. Cell proliferation assays showed that interferon gamma (IFNgamma) alone significantly inhibited proliferation of choriocarcinoma JAR and JEG-3 cells. TdT (terminal deoxynucleotidyl transferase)-mediated dUDP nick-end labelling (TUNEL) assays and Hoechst staining indicated that IFNgamma alone could not induce apoptosis of JAR and JEG-3 cells, but IFNgamma could enhance the sensitivity of JAR cells to etoposide-induced apoptosis. RT-PCR and western blotting were performed to detect expression of apoptosis-related molecules IFNgammaR, interferon regulatory factor-1 (IRF-1), p53 and pro-caspase 3. In JAR cells, etoposide increased expression of the proteins including IFNgammaR, p53 and pro-caspase 3 as well as IRF-1 mRNA and IFNgamma-pretreatment apparently promoted up-regulation of these molecules expression. In addition, the responses of IRF-1, p53 and pro-caspase 3 expression to IFNgamma pretreatment were dose dependent. IRF-1 knock down assays demonstrated that IRF-1 directly mediated IFNgamma pretreatment enhanced sensitivity of JAR cells to etoposide-induced apoptosis and that pro-caspase 3 was one of the target genes of IRF-1.
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Affiliation(s)
- Quan-Hong Sun
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
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23
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Jain N, Gupta S, Sudhakar C, Radha V, Swarup G. Role of p73 in Regulating Human Caspase-1 Gene Transcription Induced by Interferon-γ and Cisplatin. J Biol Chem 2005; 280:36664-73. [PMID: 16135520 DOI: 10.1074/jbc.m413261200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Caspase-1, a cysteine protease is primarily involved in proteolytic activation of proinflammatory cytokines such as interleukin-1beta. It is also involved in some forms of apoptosis. Here we have analyzed the role of p73, a homolog of tumor suppressor p53, in regulating human caspase-1 gene transcription. The caspase-1 promoter was strongly activated by p73alpha and p73beta primarily through a p53/p73 responsive site. Overexpression of p73 by transient transfection increased the caspase-1 mRNA level. Treatment of cells with cisplatin (which increases p73 protein level) resulted in increased caspase-1 promoter activity and its mRNA level. Blocking of p73 function by a dominant negative mutant reduced basal as well as cisplatin-induced caspase-1 promoter activity. Mutation of the p73 responsive site abolished cisplatin-induced activation of the promoter. Interferon-gamma induced caspase-1 promoter activity and this was reduced by p73-directed small hairpin RNA and also by a dominant negative mutant of p73. Abrogation of the p73 responsive site partially inhibited interferon-gamma-induced activation of the caspase-1 promoter. Treatment of HeLa cells with interferon-gamma resulted in an increase in p73 protein as well as its activity. Mutation of the IRF-1 binding site abolished interferon-gamma-induced caspase-1 promoter activity but p73-induced activation was only marginally reduced. IRF-1 cooperated with p73 and cisplatin cooperated with interferon-gamma in the activation of the caspase-1 promoter. Our results show that p73 is a regulator of caspase-1 gene transcription, and is required for optimal activation of the caspase-1 promoter by interferon-gamma.
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Affiliation(s)
- Nishant Jain
- Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India
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24
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Affiliation(s)
- Simrit Parmar
- Robert H Lurie Comprehensive Cancer Center, Division of Hematology-Onocology, Northwestern University Medical School, Chicago, IL, USA
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25
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Sun Y, Leaman DW. Involvement of Noxa in Cellular Apoptotic Responses to Interferon, Double-stranded RNA, and Virus Infection. J Biol Chem 2005; 280:15561-8. [PMID: 15705586 DOI: 10.1074/jbc.m412630200] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Double-stranded RNA (dsRNA) accumulates in virally infected cells, leading to induction of genes encoding proteins involved in signaling, apoptosis, protein synthesis/processing, and cell metabolism. Noxa is a BH3-containing mitochondrial protein that contributes to apoptosis by disrupting mitochondrial outer membrane integrity. Here we demonstrate potent induction of Noxa expression by exposure of cells to dsRNA, interferon (IFN), and virus. Noxa induction was confirmed by using reverse transcriptase-PCR and immunoblot analyses in multiple human tumor cell lines. Importantly, Noxa regulation by IFN and dsRNA was independent of p53, thereby identifying a novel mechanism of Noxa induction. Ectopic expression of Noxa in HT1080 fibrosarcoma cells enhanced cellular sensitivity to viral or dsRNA/actinomycin D-induced apoptosis, typified by enhanced cytochrome c release from the mitochondrial to the cytosolic fraction and increased cleavage of caspases 3 and 9. Point and deletion mutations of Noxa confirmed that both the BH3 domain and the mitochondrial-targeting domain were necessary for enhanced cellular apoptotic responses to dsRNA, IFN, or virus. Treatment of cells with dsRNA or virus, but not etoposide, induced interaction between Noxa and Bax that required an intact Noxa BH3 domain. Interestingly, the Noxa mitochondrial-targeting domain deletion mutant interacted with Bax in a dsRNA-dependent manner and redirected Bax away from the mitochondria, thus acting as a dominant-negative protein. Together, these data suggest that Noxa is an important component of the innate immune response of cells to viral infection, leading to enhanced cellular apoptosis that may play a role in limiting viral dissemination.
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Affiliation(s)
- Yaping Sun
- Department of Biological Sciences, University of Toledo, Toledo, Ohio 43606, USA
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26
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Ly LH, Smith R, Chapkin RS, McMurray DN. Dietary n-3 polyunsaturated fatty acids suppress splenic CD4(+) T cell function in interleukin (IL)-10(-/-) mice. Clin Exp Immunol 2005; 139:202-9. [PMID: 15654818 PMCID: PMC1809295 DOI: 10.1111/j.1365-2249.2004.02685.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/26/2004] [Indexed: 12/17/2022] Open
Abstract
Our laboratory has demonstrated that down-regulation of proliferation and cytokine synthesis by CD4(+) T cells in mice fed diets rich in n-3 polyunsaturated fatty acids (PUFA) is highly dependent on the involvement of the co-stimulatory molecule, CD28. It has been reported that the inhibitory cytokine interleukin (IL)-10 acts directly on T cells which up-regulate IL-10 receptor (IL-10R) expression following stimulation via CD28 by efficiently blocking proliferation and cytokine production. Thus, it was hypothesized that dietary n-3 PUFA would suppress T cell function through the effects of IL-10. The proliferation of purified splenic CD4(+) T cells activated in vitro with anti-CD3 and anti-CD28 (alphaCD3/CD28) from conventional mice (C57BL/6) fed either a control corn oil (CO)-enriched diet devoid of n-3 PUFA, docosahexaenoic acid (DHA; 22 : 6) or eicosapentaenoic acid (EPA; 20 : 5) for 14 days was suppressed by dietary DHA and EPA. Surprisingly, a similar trend was seen in IL-10 gene knock-out (IL-10(-/-)) mice fed dietary n-3 PUFA. IL-10R cell surface expression was also significantly down-regulated on CD4(+) T cells from both the C57BL/6 and IL-10(-/-) mice fed dietary n-3 PUFA after 72 h of in vitro stimulation with alphaCD3/CD28. Enzyme-linked immunosorbent assay (ELISA) measurements revealed that C57BL/6 mice fed DHA had significantly reduced interferon (IFN)-gamma and IL-10 levels 48 h post-activation. However, CD4(+) T cells from IL-10(-/-) mice fed dietary n-3 PUFA produced significantly greater levels of IFN-gamma than the CO-fed group. Our data suggest that in the absence of IL-10, CD4(+) T cells from n-3 PUFA-fed mice may up-regulate IFN-gamma. Suppressed CD4(+) T cells from n-3 PUFA-fed C57BL/6 mice may use mechanisms other than IL-10 to down-regulate T cell function.
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Affiliation(s)
- L H Ly
- Faculty of Nutrition, Texas A and M University, College Station, TX 77843, USA
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27
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Lamkanfi M, Denecker G, Kalai M, D'hondt K, Meeus A, Declercq W, Saelens X, Vandenabeele P. INCA, a novel human caspase recruitment domain protein that inhibits interleukin-1beta generation. J Biol Chem 2004; 279:51729-38. [PMID: 15383541 DOI: 10.1074/jbc.m407891200] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Using in silico methods for screening the human genome for new caspase recruitment domain (CARD) proteins, we have identified INCA (Inhibitory CARD) as a protein that shares 81% identity with the prodomain of caspase-1. The INCA gene is located on chromosome 11q22 between the genes of COP/Pseudo-ICE and ICEBERG, two other CARD proteins that arose from caspase-1 gene duplications. We show that INCA mRNA is expressed in many tissues. INCA is specifically upregulated by interferon-gamma in the monocytic cell lines THP-1 and U937. INCA physically interacts with procaspase-1 and blocks the release of mature IL-1beta from LPS-stimulated macrophages. Unlike COP/Pseudo-ICE and procaspase-1, INCA does not interact with RIP2 and does not induce NF-kappaB activation. Our data show that INCA is a novel intracellular regulator of procaspase-1 activation, involved in the regulation of pro-IL-1beta processing and its release during inflammation.
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Affiliation(s)
- Mohamed Lamkanfi
- Unit of Molecular Signalling and Cell Death, Department for Molecular Biomedical Research, VIB-Ghent University, Technologiepark 927, Zwijnaarde B-9052, Belgium
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28
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Bouker KB, Skaar TC, Fernandez DR, O'Brien KA, Riggins RB, Cao D, Clarke R. interferon regulatory factor-1 mediates the proapoptotic but not cell cycle arrest effects of the steroidal antiestrogen ICI 182,780 (faslodex, fulvestrant). Cancer Res 2004; 64:4030-9. [PMID: 15173018 DOI: 10.1158/0008-5472.can-03-3602] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Antiestrogens induce both cytostasis (cell cycle arrest) and apoptosis, but the relationship between these end points and the signaling that regulates their induction are unclear. We have previously implicated the transcription factor and putative tumor suppressor IFN regulatory factor-1 (IRF-1) in acquired antiestrogen resistance (Gu et al., Cancer Res, 62: 3428-3437, 2002). We now show the functional significance of IRF-1 in affecting antiestrogen responsiveness in estrogen receptor-positive antiestrogen-sensitive models (MCF-7, T47D, and ZR-75-1), a model of acquired antiestrogen resistance (MCF7/LCC9; estrogen receptor positive), and a model of de novo antiestrogen resistance (MDA-MB-231; estrogen receptor negative). Basal IRF-1 mRNA expression is lower in MCF7/LCC9 cells when compared with MCF-7, T47D, and ZR-75-1 cells. IRF-1 transcriptional activity in MCF-7/LCC9 cells is 18-fold lower than that seen in the parental cells (MCF-7/LCC1) and is comparable with that in MDA-MB-231 cells. Although IRF-1 mRNA expression is induced by ICI 182,780 in sensitive cells, this regulation is lost in MCF-7/LCC9 and is absent in MDA-MB-231 cells. Loss of IRF-1 regulation appears specific to antiestrogen resistance-resistant cells induce IRF-1 mRNA in response to the cytotoxic drug doxorubicin. A dominant-negative IRF-1 eliminates the ICI 182,780-induced apoptotic response (reduced >4-fold) and reduces MCF-7 and T47D cell sensitivity to the antiproliferative effects of ICI 182,780. This effect is not mediated by changes in cell cycle distribution; rather, dominant-negative IRF-1 reduces ICI 182,780-induced apoptosis. These data identify a novel mechanism of antiestrogen resistance and implicate IRF-1 as a key component in signaling some ER-mediated effects on apoptosis/cell survival.
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Affiliation(s)
- Kerrie B Bouker
- Department of Oncology and Lombardi Comprehensive Cancer Center, Georgetown University School of Medicine, Washington, District of Columbia 20007, USA
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29
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Höpfner M, Sutter AP, Huether A, Ahnert-Hilger G, Scherübl H. A novel approach in the treatment of neuroendocrine gastrointestinal tumors: additive antiproliferative effects of interferon-gamma and meta-iodobenzylguanidine. BMC Cancer 2004; 4:23. [PMID: 15154969 PMCID: PMC442128 DOI: 10.1186/1471-2407-4-23] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2003] [Accepted: 05/21/2004] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Therapeutic options to effectively inhibit growth and spread of neuroendocrine gastrointestinal tumors are still limited. As both meta-iodobenzylguanidine (MIBG) and interferon-gamma (IFNgamma) cause antineoplastic effects in neuroendocrine gastrointestinal tumor cells, we investigated the antiproliferative effects of the combination of IFNgamma and non-radiolabeled MIBG in neuroendocrine gut STC-1 and pancreatic carcinoid BON tumor cells. METHODS AND RESULTS IFNgamma receptors were expressed in both models. IFNgamma dose- and time-dependently inhibited the growth of both STC-1 and of BON tumor cells with IC50-values of 95 +/- 15 U/ml and 135 +/- 10 U/ml, respectively. Above 10 U/ml IFNgamma induced apoptosis-specific caspase-3 activity in a time-dependent manner in either cell line and caused a dose-dependent arrest in the S-phase of the cell cycle. Furthermore, IFNgamma induced cytotoxic effects in NE tumor cells. The NE tumor-targeted drug MIBG is selectively taken up via norepinephrine transporters, thereby specifically inhibiting growth in NE tumor cells. Intriguingly, IFNgamma treatment induced an upregulation of norepinephrine transporter expression in neuroendocrine tumors cells, as determined by semi-quantitative RT-PCR. Co-application of sub-IC50 concentrations of IFNgamma and MIBG led to additive growth inhibitory effects, which were mainly due to increased cytotoxicity and S-phase arrest of the cell cycle. CONCLUSION Our data show that IFNgamma exerts antiproliferative effects on neuroendocrine gastrointestinal tumor cells by inducing cell cycle arrest, apoptosis and cytotoxicity. The combination of IFNgamma with the NE tumor-targeted agent MIBG leads to effective growth control at reduced doses of either drug. Thus, the administration of IFNgamma alone and more so, in combination with MIBG, is a promising novel approach in the treatment of neuroendocrine gastrointestinal tumors.
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Affiliation(s)
- Michael Höpfner
- Charité – Universitätsmedizin Berlin, Campus Benjamin Franklin, Medical Clinic I, Hindenburgdamm 30, 12200 Berlin, Germany
| | - Andreas P Sutter
- Charité – Universitätsmedizin Berlin, Campus Benjamin Franklin, Medical Clinic I, Hindenburgdamm 30, 12200 Berlin, Germany
| | - Alexander Huether
- Charité – Universitätsmedizin Berlin, Campus Benjamin Franklin, Medical Clinic I, Hindenburgdamm 30, 12200 Berlin, Germany
| | - Gudrun Ahnert-Hilger
- Charité – Universitätsmedizin Berlin, Campus Mitte, Institut für Anatomie, Philippstrasse 12, 10115 Berlin, Germany
| | - Hans Scherübl
- Charité – Universitätsmedizin Berlin, Campus Mitte, Institut für Anatomie, Philippstrasse 12, 10115 Berlin, Germany
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30
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Buntinx M, Gielen E, Van Hummelen P, Raus J, Ameloot M, Steels P, Stinissen P. Cytokine-induced cell death in human oligodendroglial cell lines. II: Alterations in gene expression induced by interferon-? and tumor necrosis factor-? J Neurosci Res 2004; 76:846-61. [PMID: 15160396 DOI: 10.1002/jnr.20117] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Cytokines, such as interferon-gamma (IFN-gamma) and tumor necrosis factor-alpha (TNF-alpha), can initiate dual effects resulting in either cell growth or cell death. In this study, the human oligodendroglial cell lines HOG and MO3.13 were used as a model to study the molecular mechanisms of cytokine-induced cell death in human oligodendrocytes. We have previously shown that TNF-alpha and IFN-gamma induce apoptosis in both oligodendroglial cell lines within 72 hr. In the present study, the cell death pathways operating within these cells were further investigated at the gene expression level. Both cell lines express a broad repertoire of caspases and apoptosis-related genes. Some of these genes are specifically up-regulated by cytokine treatment; e.g., caspase-1 is up-regulated by IFN-gamma. In addition to direct cytotoxic effects, IFN-gamma and TNF-alpha also enhance the expression of Fas, TNFR1, and MHC class I molecules in both cell lines. This suggests that cytokines can make oligodendrocytes more vulnerable to different cell death pathways in an inflammatory environment. cDNA microarray analysis of the HOG cell line revealed that TNF-alpha induces genes that regulate apoptosis, survival, inflammation, cell metabolism, and cell signaling. The data suggest that oligodendroglial cells activate both death and survival pathways upon cytokine challenges. However, the survival pathways seem to be unable to compete with the death signal after more than 24 hr of cytokine treatment. These results may contribute to the development of therapeutic strategies aimed at interfering with cytokine-induced cell death of oligodendrocytes in patients with multiple sclerosis.
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Affiliation(s)
- Mieke Buntinx
- Biomedisch Onderzoeksinstituut, Limburgs Universitair Centrum and School of Life Sciences, Transnationale Universiteit Limburg, Universitaire Campus A, Diepenbeek, Belgium
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Abstract
Production of interferon-gamma (IFNgamma) in response to infection is a hallmark of innate and adaptive immunity. In addition to the pivotal role of IFNgamma in host defense, its excessive release has been associated with the pathogenesis of chronic inflammatory and autoimmune diseases. In fact, knockout models reveal that IFNgamma plays a key role in mediating a number of pathological processes related to chronic immune activation. On the other hand, evidence has been accumulated in recent years that supports the concept of a dual role of IFNgamma in inflammation. Here, we review anti-inflammatory aspects of IFNgamma in the regulatory network of cytokine biology. These include induction of anti-inflammatory molecules such as interleukin (IL)-1 receptor antagonist (IL-1Ra) and IL-18 binding protein (IL-18BP), modulation of pro-inflammatory cytokine production, activation of apoptosis, and interference with the signal transduction machinery by induction of suppressors of cytokine signaling (SOCS).
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Affiliation(s)
- Heiko Mühl
- Pharmazentrum Frankfurt, University Hospital Johann Wolfgang Goethe-Universität Frankfurt am Main, Theodor-Stern-Kai 7, D-60590, Frankfurt am Main, Germany.
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Kalai M, Lamkanfi M, Denecker G, Boogmans M, Lippens S, Meeus A, Declercq W, Vandenabeele P. Regulation of the expression and processing of caspase-12. J Cell Biol 2003; 162:457-67. [PMID: 12885762 PMCID: PMC2172698 DOI: 10.1083/jcb.200303157] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Phylogenetic analysis clusters caspase-12 with the inflammatory caspases 1 and 11. We analyzed the expression of caspase-12 in mouse embryos, adult organs, and different cell types and tested the effect of interferons (IFNs) and other proinflammatory stimuli. Constitutive expression of the caspase-12 protein was restricted to certain cell types, such as epithelial cells, primary fibroblasts, and L929 fibrosarcoma cells. In fibroblasts and B16/B16 melanoma cells, caspase-12 expression is stimulated by IFN-gamma but not by IFN-alpha or -beta. The effect is increased further when IFN-gamma is combined with TNF, lipopolysaccharide (LPS), or dsRNA. These stimuli also induce caspase-1 and -11 but inhibit the expression of caspase-3 and -9. In contrast to caspase-1 and -11, no caspase-12 protein was detected in macrophages in any of these treatments. Transient overexpression of full-length caspase-12 leads to proteolytic processing of the enzyme and apoptosis. Similar processing occurs in TNF-, LPS-, Fas ligand-, and thapsigargin (Tg)-induced apoptosis. However, B16/B16 melanoma cells die when treated with the ER stress-inducing agent Tg whether they express caspase-12 or not.
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Affiliation(s)
- Michael Kalai
- Department of Molecular Biomedical Research, Unit of Molecular Signalling and Cell Death, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium
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Tomita Y, Bilim V, Hara N, Kasahara T, Takahashi K. Role of IRF-1 and caspase-7 in IFN-gamma enhancement of Fas-mediated apoptosis in ACHN renal cell carcinoma cells. Int J Cancer 2003; 104:400-8. [PMID: 12584735 DOI: 10.1002/ijc.10956] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Caspases exist as zymogens, and are activated by various extracellular stimuli, leading to apoptosis. One such stimulus is Fas/CD95, a member of the tumor necrosis factor receptor family, providing one means of cytotoxic T lymphocyte (CTL)-mediated cell lysis. Clinical evidence has shown that administration of cytokine leads to regression in selected patients with renal cell carcinomas (RCCs). Interferon-gamma (IFN-gamma) indicates its contribution to anti-tumor activity of immune cells. IFN-gamma elicits its effect through the transcription factor signal transducer and activator of transcription-1 (STAT-1), and through interferon regulatory factor-1 (IRF-1), one of the target genes of STAT-1. Our previous study demonstrated an increase in the susceptibility of ACHN cells, established from RCC, to Fas-mediated apoptosis by IFN-gamma, and the inhibition of this effect by the caspase-3 and -7 inhibitor, DEVD-CHO. We demonstrated the following phenomena in IFN-gamma-treated ACHN cells: 1) enhanced transcription of caspase-1, 3 and 7 mRNAs without any change in cleavage of their substrates; 2) increased cleavage DEVD (specific for caspase-3 and 7), but not YVAD (for caspase-1) or DMQD (for caspase-3), after anti-Fas/CD95 MAb treatment; 3) activation of the STAT-1 and IRF-1 pathway; and 4) partial abrogation of the IFN-gamma-induced increase in Fas-mediated apoptosis by antisense IRF-1 oligodeoxynucleotide. These results suggest that IRF-1 plays a pivotal role in the IFN-gamma-mediated-enhancement of Fas/CD95-mediated apoptosis, through regulation of DEVD-CHO-sensitive caspases, most likely caspase-7.
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Affiliation(s)
- Yoshihiko Tomita
- Division of Molecular Oncology, Department of Signal Transduction Research, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
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Nguyen NP, Levinson B, Dutta S, Karlsson U, Alfieri A, Childress C, Sallah S. Concurrent interferon-alpha and radiation for head and neck melanoma. Melanoma Res 2003; 13:67-71. [PMID: 12569287 DOI: 10.1097/00008390-200302000-00011] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Melanoma cells are resistant to radiation in part due to their capacity to repair sublethal damage. A large fraction dose is therefore often utilized. However, if the tumour is located close to critical structures with modest tolerance, high fraction doses increase the risk for late complications compared with standard fractionation, but using the latter alone risks the desired outcome. Concurrent systemic biotherapy with standard radiation fractions may therefore represent an acceptable compromise. The outcome of concurrent systemic interferon-alpha (IFNalpha) and radiation in three patients with head and neck melanoma was evaluated. Standard radiation fractions were used because of the radiosensitizing properties of IFNalpha. Acute toxicity was significant and required treatment interruptions. However, all side effects subsided following treatment. All three patients achieved local control at follow-up periods of 24, 18 and 19 months, respectively. One patient developed widespread distant metastases. The combination of IFNalpha with radiation is considered feasible in terms of outcome and should be investigated with a larger cohort of patients. Toxicity is significant, and the addition of radioprotectors could be desirable.
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Affiliation(s)
- N P Nguyen
- Department of Radiation Oncology and Division of Hematology/Oncology, University of Texas Southwestern Medical Center, Dallas, Texas 75216, USA.
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Detjen KM, Murphy D, Welzel M, Farwig K, Wiedenmann B, Rosewicz S. Downregulation of p21(waf/cip-1) mediates apoptosis of human hepatocellular carcinoma cells in response to interferon-gamma. Exp Cell Res 2003; 282:78-89. [PMID: 12531694 DOI: 10.1016/s0014-4827(02)00011-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
There is no effective treatment for advanced hepatocellular carcinoma (HCC). We therefore explored the molecular mechanisms of interferon-gamma (IFN-gamma)-mediated growth regulation in human HCC cell lines. IFN-gamma receptor expression, signal transduction, and regulation of effectors were examined by RT-PCR, immunoprecipitation, immunoblotting, and reporter gene assays. Growth and apoptosis were determined based on cell numbers, cell cycle analyses, kinase assays, DNA fragmentation, and PARP cleavage. HCC cell lines express functionally intact IFN-gamma receptors and downstream effectors. IFN-gamma profoundly inhibited growth of HCC cells via two different mechanisms: inhibition of G1 cell cycle progression and induction of apoptosis. Analyses in SK-Hep-1 cells revealed a deficient cyclin D induction in IFN-gamma-treated cells, resulting in reduced activity of CDK4 and CDK2 kinases and pRB hypophosphorylation. In contrast, apoptosis prevailed in IFN-gamma-treated HepG2 cultures. A survey of apoptosis relevant IFN-gamma effectors including IRF-1, caspase-1, caspase-3, and p21(waf/cip-1) documented a dramatic transcriptional downregulation of p21(waf/cip-1) exclusively in apoptosis-susceptible HepG2 cells. Reconstitution of p21(waf/cip-1) rescued HepG2 cells from IFN-gamma-induced apoptosis, indicating that p21(waf/cip-1) reduction was required for apoptosis execution. Inversely, downregulation of p21(waf/cip-1) sensitized SK-Hep-1 cells to IFN-gamma-induced apoptosis. Thus, downregulation of p21(waf/cip-1) in HCC cells functions as a novel, critical determinant of alternative growth inhibitory pathways in response to IFN-gamma.
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Affiliation(s)
- Katharina M Detjen
- Medizinische Klinik mit Schwerpunkt Hepatologie und Gastroenterologie, Universitätsklinikum Charité, Campus Virchow-Klinikum, Humboldt Universität zu Berlin, Germany
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36
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Kim EJ, Lee JM, Namkoong SE, Um SJ, Park JS. Interferon regulatory factor-1 mediates interferon-gamma-induced apoptosis in ovarian carcinoma cells. J Cell Biochem 2002; 85:369-80. [PMID: 11948692 DOI: 10.1002/jcb.10142] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Interferon-gamma (IFN-gamma), as one of interferon family that regulates antiviral, antiproliferative, and immunomodulatory responses, has been implicated for the growth regulation of ovarian cancer cells. However, the molecular mechanisms are not yet fully defined. To analyze detailed mechanisms, the ovarian cancer cell lines (2774, PA-1, OVCAR-3, and SKOV-3) were treated with IFN-gamma. The growth of 2774 was most effectively suppressed than that of other cells in both time-course and dose-dependent experiments. The order of sensitivity in other cells was PA-1 >> OVCAR-3 > SKOV-3 (not responded at all). The DNA fragmentation and DAPI staining assays suggested that the IFN-gamma-mediated cytotoxicity could be triggered by apoptosis. The treatment induced IFN regulatory factor-1 (IRF-1) in two IFN-gamma-sensitive cells (2774, PA-1), whereas IRF-1 was not induced in two IFN-gamma-resistant cells (OVCAR-3, SKOV-3). The levels of p53 and p21WAF1 were not strikingly changed in all four cells. Interestingly, the expression of interleukin-converting enzyme (ICE, or caspase-1) was increased by the treatment in a kinetically consistent manner to the induction of IRF-1. However, CD95 (Fas/APO-1) was not changed. Apoptosis was greatly induced, when IRF-1 was transiently expressed in PA-1 without the treatment of IFN-gamma. However, it was repressed when IRF-1 together with IRF-2, an antagonist of IRF-1, were coexpressed. In addition, the effect of IFN-gamma was reduced in the 2774 and PA-1 cells stably expressing either IRF-1 antisense or IRF-2 sense, as shown by the cytotoxicity and FACS analysis. Furthermore, the IFN-gamma-induced apoptosis was greatly reduced, when inhibitors of ICE were treated into PA-1 cells. Taken together, these results suggest that IRF-1 directly mediates the IFN-gamma-induced apoptosis via the activation of caspase-1 gene expression in IFN-gamma-sensitive ovarian cancer cells.
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Affiliation(s)
- Eun-Joo Kim
- Department of Medical Bioscience, Graduate School, Catholic University, Seoul, Korea
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37
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Naldini A, Carney DH, Pucci A, Carraro F. Human alpha-thrombin stimulates proliferation of interferon-gamma differentiated, growth-arrested U937 cells, overcoming differentiation-related changes in expression of p21CIP1/WAF1 and cyclin D1. J Cell Physiol 2002; 191:290-7. [PMID: 12012324 DOI: 10.1002/jcp.10101] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In addition to its central role in blood coagulation and hemostasis, human alpha-thrombin is a growth factor for a variety of cell types. We recently demonstrated that interferon-gamma (IFNgamma)-differentiated U937 cells show increased expression of the proteolytically activated receptor for thrombin (PAR-1) relative to undifferentiated U937. In the present study we show that cell proliferation is inhibited in IFNgamma-differentiated cells relative to undifferentiated U937. Addition of thrombin to the differentiated cells, however, overcomes the inhibition and restores the cells to a highly proliferative state. Ribonuclease protection assays indicate that the IFNgamma-induced growth arrest is associated with an increased expression of the cyclin-dependent kinase inhibitor p21(CIP1/WAF1) and downregulation of cyclin D(1). Treatment of cells with thrombin downregulates p21(CIP1/WAF1) expression in these cells and upregulates cyclin D(1) mRNA expression, thus overcoming the differentiation-related effects in a coordinated manner. Treating differentiated cells with the PAR-1 activation peptide, SFLLRN, stimulates proliferation and has effects similar to those of thrombin on expression of p21(CIP1/WAF1). Thus, it appears that these thrombin stimulated proliferative effects are mediated through activation of PAR-1. These results may help explain how thrombin can overcome growth arrest in normal tissue to initiate tissue repair and why thrombin and thrombin-like enzymes may contribute to unrestricted proliferation observed in certain malignancies.
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38
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Savoldi-Barbosa M, Sakamoto-Hojo ET. Influence of interferon-gamma on radiation-induced apoptosis in normal and ataxia-telangiectasia fibroblast cell lines. TERATOGENESIS, CARCINOGENESIS, AND MUTAGENESIS 2002; 21:417-29. [PMID: 11746255 DOI: 10.1002/tcm.1029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Combination of interferon-gamma (IFN-gamma) with radiation, or chemotherapeutic agents, produces different kind of modulatory effects, depending on the cell types and experimental conditions. The objective of the present study was verify the influence of IFN-gamma on the induction of apoptosis by gamma-radiation. Experiments were carried out on human fibroblast cell lines: VH-25 (primary), MRC-5, and AT-5BIVA (SV40-transformed). Exponentially growing cells were irradiated and exposed to IFN-gamma (1,000, 2,000, and 3,000 UI/mL) until in situ cell staining performed at 6, 24, and 48 h. Induction of apoptosis by ionising radiation was not verified in primary VH-25 cells. A significant increase in the frequencies of apoptotic cells was observed in SV-40-transformed cells lines, MRC-5, and AT-5BIVA fibroblasts, which were irradiated with 1.0 Gy, but the frequencies of necrotic cells were similar to the control levels. In MRC-5 cells, combined treatments with radiation and IFN-gamma induced a statistically significant reduction in the frequencies of apoptotic cells detected at 24 and 48 h after cell irradiation, while for AT cells the interaction effect (reduction of apoptosis frequency) was significant even at earlier time collection (6 h) after gamma-irradiation, and higher when compared to MRC-5 cells. The present study demonstrated that IFN-gamma showed an anti-apoptotic activity in SV40-transformed fibroblasts, normal and AT cells, which were irradiated with gamma-rays, thus indicating a mechanism dependent on the cellular type.
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Affiliation(s)
- M Savoldi-Barbosa
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brazil
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39
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Lee TB, Min YD, Lim SC, Kim KJ, Jeon HJ, Choi SM, Choi CH. Fas (Apo-1/CD95) and Fas ligand interaction between gastric cancer cells and immune cells. J Gastroenterol Hepatol 2002; 17:32-8. [PMID: 11895550 DOI: 10.1046/j.1440-1746.2002.02657.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS It has been proposed that the expression of Fas ligand (Fas L) in tumors may play an important role in immune escape. This study was undertaken to test a 'counterattack' theory as a mechanism of immune escape in gastric carcinoma. METHODS Expression of Fas and Fas L was examined in the human gastric cancer cell lines using reverse transcription-polymerase chain reaction. Cytotoxicity was determined by the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide] assay. Apoptosis of target Jurkat cells was examined after coculture with the effector gastric cancer cells in vitro. Immunohistochemical staining was performed for the detection of Fas and FasL in tumor-infiltrating lymphocytes (TIL) and gastric cancer cells in vivo. Apoptosis was detected by terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick-end labeling (TUNEL) method in vitro and in vivo. RESULTS Fas and FasL mRNA were found to be differentially expressed in gastric cancer cell lines. The coculture experiment showed that apoptosis of Jurkat was induced by a FasL-overexpressing effector gastric cell SNU-484. In a Fas-expressing gastric cell SNU-638, Fas expression was upregulated by the treatment of gamma-interferon in a time- and concentration-dependent manner. SNU-638 treated with gamma-interferon was more sensitive to anti-Fas antibody-mediated cytotoxicity than was the control cell line, suggesting an increase of functional Fas in gastric cancer cells. The expression of FasL in gastric cancer cells and of Fas in apoptotic TIL was also detected in vivo. CONCLUSION The data indicate that the FasL expression of gastric cancer cells supports a 'counterattack theory' in gastric cancer cells and that the upregulation of Fas by IFN-gamma in SNU-638 may accelerate the apoptosis pathway through the Fas and FasL interaction between gastric cancer cells and immune cells. This result is supported by the expression of FasL in gastric cancer cells and apoptotic TIL in vivo. It is implicated that the different biological behaviors of gastric cancer cells could be at least in part explained by Fas and FasL interaction with immune cells.
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Affiliation(s)
- Tae-Bum Lee
- Department of Pharmacology, Chosun University Medical School, Gwangju, South Korea
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40
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Bernabei P, Coccia EM, Rigamonti L, Bosticardo M, Forni G, Pestka S, Krause CD, Battistini A, Novelli F. Interferon‐γ receptor 2 expression as the deciding factor in human T, B, and myeloid cell proliferation or death. J Leukoc Biol 2001. [DOI: 10.1189/jlb.70.6.950] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Paola Bernabei
- Department of Clinical and Biological Sciences, University of Turin, I‐10043 Orbassano,
- Centro Ricerche di Medicina Sperimentale, S. Giovanni Battista Hospital, I‐10126 Turin
| | - Eliana M. Coccia
- Immunology and Virology Laboratories, Istituto Superiore di Sanitá, I‐00161 Rome, Italy
| | - Laura Rigamonti
- Department of Clinical and Biological Sciences, University of Turin, I‐10043 Orbassano,
- Centro Ricerche di Medicina Sperimentale, S. Giovanni Battista Hospital, I‐10126 Turin
| | - Marita Bosticardo
- Department of Clinical and Biological Sciences, University of Turin, I‐10043 Orbassano,
- Centro Ricerche di Medicina Sperimentale, S. Giovanni Battista Hospital, I‐10126 Turin
| | - Guido Forni
- Department of Clinical and Biological Sciences, University of Turin, I‐10043 Orbassano,
- Centro Ricerche di Medicina Sperimentale, S. Giovanni Battista Hospital, I‐10126 Turin
| | - Sidney Pestka
- Department of Molecular Genetics and Microbiology, UMDNJ, Piscataway, New Jersey
| | | | - Angela Battistini
- Immunology and Virology Laboratories, Istituto Superiore di Sanitá, I‐00161 Rome, Italy
| | - Francesco Novelli
- Department of Clinical and Biological Sciences, University of Turin, I‐10043 Orbassano,
- Centro Ricerche di Medicina Sperimentale, S. Giovanni Battista Hospital, I‐10126 Turin
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Jiang MC, Lin TL, Lee TL, Huang HT, Lin CL, Liao CF. IRF-1-mediated CAS expression enhances interferon-gamma-induced apoptosis of HT-29 colon adenocarcinoma cells. MOLECULAR CELL BIOLOGY RESEARCH COMMUNICATIONS : MCBRC 2001; 4:353-8. [PMID: 11703094 DOI: 10.1006/mcbr.2001.0303] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The expression of CAS is reported to be upregulated in a variety of human tumor cells, and such expression correlates with the development of tumors. CAS also plays a role in apoptosis. We investigated whether CAS expression affects the susceptibility of tumor cells to IFN-gamma-induced apoptosis. Our data show that IFN-gamma treatment induces CAS expression in HT-29 tumor cells. IFN-gamma-induced gene expression is primarily mediated by the transcriptional factor, IRF-1. Our data show that IRF-1 mediates IFN-gamma-induced CAS expression. Transfection of HT-29 cells with CAS expression vector did not induce apoptosis of cells; nevertheless, CAS overexpression greatly enhanced IFN-gamma-induced apoptosis of cells. CPP32 is regarded as one of the central apoptosis executioner molecules. CAS overexpression enhances IFN-gamma-induced CPP32 expression. These results indicate that tumor cells highly expressing CAS may be more susceptible to apoptosis induced by reagents that are capable of inducing CAS expression. Thus, CAS may be a target for the elimination of tumors.
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Affiliation(s)
- M C Jiang
- Institute of Zoology, Academia Sinica, Taipei 11529, Taiwan, Republic of China
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42
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Tsutsumi H, Takeuchi R, Chiba S. Activation of cellular genes in the mucosal epithelium by respiratory syncytial virus: implications in disease and immunity. Pediatr Infect Dis J 2001; 20:997-1001. [PMID: 11642637 DOI: 10.1097/00006454-200110000-00016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- H Tsutsumi
- Department of Pediatrics, Sapporo Medical University School of Medicine, Japan.
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43
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Detjen KM, Farwig K, Welzel M, Wiedenmann B, Rosewicz S. Interferon gamma inhibits growth of human pancreatic carcinoma cells via caspase-1 dependent induction of apoptosis. Gut 2001; 49:251-62. [PMID: 11454803 PMCID: PMC1728385 DOI: 10.1136/gut.49.2.251] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND AIMS The poor prognosis of pancreatic cancer is partly due to resistance to a broad spectrum of apoptotic stimuli. To identify intact proapoptotic pathways of potential clinical relevance, we characterised the effects of interferon gamma (IFN-gamma) on growth and survival in human pancreatic cancer cells. METHODS IFN-gamma receptor expression and signal transduction were examined by reverse transcriptase-polymerase chain reaction (RT-PCR), immunoprecipitation, western blot analysis, and transactivation assays. Effects on cell growth and survival were evaluated in terms of cell numbers, colony formation, cell cycle analysis, DNA fragmentation, and poly(ADP ribose) polymerase (PARP) cleavage. RESULTS All four pancreatic cancer cell lines examined expressed functional IFN-gamma receptors and downstream effectors, including the putative tumour suppressor interferon regulatory factor 1 (IRF-1). IFN-gamma treatment profoundly inhibited anchorage dependent and independent growth of pancreatic cancer cells. Cell cycle analyses revealed subdiploid cells suggesting apoptosis, which was confirmed by demonstration of DNA fragmentation and PARP cleavage. Time and dose dependency of apoptosis induction and growth inhibition correlated closely, identifying apoptosis as the main, if not exclusive, mechanism responsible for growth inhibition. Apoptosis was preceded by upregulation of procaspase-1 and accompanied by proteolytic activation. Furthermore, the caspase inhibitor z-vad-fmk completely prevented IFN-gamma mediated apoptosis. CONCLUSIONS These results identify an intact proapoptotic pathway in pancreatic cancer cells and suggest that IRF-1 and/or procaspase-1 may represent potential therapeutic targets to be further explored.
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Affiliation(s)
- K M Detjen
- Medizinische Klinik mit Schwerpunkt Hepatologie und Gastroenterologie, Universitätsklinikum Charité, Campus Virchow Klinikum, Humboldt Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
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Shin EC, Ahn JM, Kim CH, Choi Y, Ahn YS, Kim H, Kim SJ, Park JH. IFN-gamma induces cell death in human hepatoma cells through a TRAIL/death receptor-mediated apoptotic pathway. Int J Cancer 2001; 93:262-8. [PMID: 11410875 DOI: 10.1002/ijc.1310] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We demonstrated the induction of cell death in a hepatoma cell line by IFN-gamma and its possible mechanism. Among the 2 hepatitis B virus (HBV)-associated hepatoma cell lines, SNU-354 and SNU-368, IFN-gamma induced cell death and increased caspase-3 activity in SNU-368 but not in SNU-354. IFN-gamma induced several changes in the mRNA expression level of apoptosis-regulating genes, e.g., increased expression of Fas, caspase-1 and TNF-related apoptosis-inducing ligand (TRAIL). In particular, IFN-gamma potently increased the mRNA expression of TRAIL in both cell lines. However, it did not change the mRNA expression level of death-mediating TRAIL receptors, e.g., DR4 and DR5, which were constitutively expressed in both cell lines. In contrast, the decoy receptor DcR1 was expressed in SNU-354 but not in SNU-368, and its expression level in SNU-354 was increased by IFN-gamma. Another decoy receptor, DcR2, was constitutively expressed in both cell lines; however, its expression level in SNU-368 was decreased by IFN-gamma. In addition, exogenous recombinant TRAIL reduced viability in SNU-368, but not in SNU-354, cells. From these findings, we speculated that TRAIL up-regulation and the subsequent TRAIL-mediated apoptosis serve as a mechanism of IFN-gamma-induced cell death in SNU-368. To confirm this hypothesis, we demonstrated that soluble DR4-Fc fusion protein, a TRAIL pathway inhibitor, inhibited IFN-gamma-induced cell death in SNU-368. Our results demonstrated that IFN-gamma acts as an inducer of cell death through TRAIL-mediated apoptosis.
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Affiliation(s)
- E C Shin
- Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Republic of Korea 120-752
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Abstract
Since its discovery as an interferon (IFN)-gamma-inducing factor, it has become evident that interleukin (IL)-18 plays a crucial role in the generation of protective immunity against microbial infections. Macrophages are the major source of biologically active IL-18, and they express constitutively IL-18 mRNA and proIL-18 protein. Microbial infections enhance the IL-18 gene expression in macrophages but post-translational processing of proIL-18, rather than transcriptional activation, is predominant in the regulation of IL-18 secretion. This review summarizes the current knowledge of proinflammatory and immunomodulatory properties of IL-18, and focuses on the role of caspases in the proteolytic activation of IL-18 in response to virus infection.
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Affiliation(s)
- J Pirhonen
- Department of Virology, National Public Health Institute, Helsinki, Finland.
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46
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Varela N, Munoz-Pinedo C, Ruiz-Ruiz C, Robledo G, Pedroso M, López-Rivas A. Interferon-gamma sensitizes human myeloid leukemia cells to death receptor-mediated apoptosis by a pleiotropic mechanism. J Biol Chem 2001; 276:17779-87. [PMID: 11279136 DOI: 10.1074/jbc.m100815200] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The role of interferon (IFN)-gamma as a sensitizing agent in apoptosis induced by ligation of death receptors has been evaluated in human myeloid leukemia cells. Incubation of U937 cells with IFN-gamma sensitized these cells to apoptosis induced by tumor necrosis factor-alpha, agonistic CD95 antibody, and tumor necrosis factor-related apoptosis-inducing ligand. Other human myeloid leukemic cells were also sensitized by IFN-gamma to death receptor-mediated apoptosis. Treatment of U937 cells with IFN-gamma up-regulated the expression of caspase-8 and potently synergized with death receptor ligation in the processing of caspase-8 and BID cleavage. Concomitantly, a marked down-regulation of BCL-2 protein was also observed in cells incubated with IFN-gamma. Furthermore, the caspase-dependent generation of a 23-kDa fragment of BCL-2 protein, the release of cytochrome c from mitochondria and the activation of caspase-9 were also enhanced upon death receptor ligation in IFN-gamma-treated cells. Ectopically expressed Bcl-2 protein inhibited IFN-gamma-induced sensitization to apoptosis. In summary, these results indicate that IFN-gamma sensitizes human myeloid leukemic cells to a death receptor-induced, mitochondria-mediated pathway of apoptosis.
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Affiliation(s)
- N Varela
- Instituto de Parasitologia y Biomedicina, Consejo Superior de Investigaciones Cientificas, calle Ventanilla 11, 18001 Granada, Spain
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47
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Nguyen NP, Sallah S, Childress C, Salehpour MR, Karlsson U. Interferon-alpha combined with radiotherapy in the treatment of unresectable melanoma. Cancer Invest 2001; 19:261-5. [PMID: 11338883 DOI: 10.1081/cnv-100102553] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A case of recurrent and twice resected sinonasal melanoma is presented. The large recurrent tumor was found to regress by a concurrent combination of 6660 cGy photon radiation and subcutaneous interferon-alpha injections given for a period of 8 weeks. Possible mechanisms of potentiation between interferon and radiation are discussed. The unexpected result in this case report raises interesting questions about this treatment combination.
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Affiliation(s)
- N P Nguyen
- Department of Radiation/Oncology, Southwestern University, Dallas, Texas, USA.
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48
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Pirhonen J, Sareneva T, Julkunen I, Matikainen S. Virus infection induces proteolytic processing of IL-18 in human macrophages via caspase-1 and caspase-3 activation. Eur J Immunol 2001; 31:726-33. [PMID: 11241276 DOI: 10.1002/1521-4141(200103)31:3<726::aid-immu726>3.0.co;2-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
There is increasing evidence that IL-18 is a key pro-inflammatory cytokine and an important mediator of Th1 immune response. The main source of IL-18 is macrophage-like cells. In the present study we have investigated IL-18 protein expression in primary human macrophages in response to influenza A and Sendai virus infections. Macrophages constitutively expressed proIL-18 but produced biologically active IL-18 only after virus infection. The IL-18 release was due to virus infection-induced proteolytic processing of 24-kDa proIL-18 into its mature 18-kDa form. ProIL-18 processing required active caspase-1 enzyme and the release of mature IL-18 was blocked with a caspase-1-specific inhibitor. Caspase-3 inhibitor also reduced IL-18 production in response to virus infection. Inactive proforms of caspase-1 and caspase-3 were basally expressed in macrophages, and virus infection induced the cleavage of procaspases into their mature forms. Besides increasing the expression of caspase proteins, virus infection enhanced caspase mRNA expression in macrophages. The enhancement of caspase gene expression was abrogated by anti-IFN-alpha antibody. Furthermore, IFN-alpha and IFN-gamma could induce caspase gene expression. These results imply that interferons are involved in virus-induced caspase activation that leads to proIL-18 processing and subsequent release of mature IL-18.
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Affiliation(s)
- J Pirhonen
- Department of Virology, National Public Health Institute, Helsinki, Finland.
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49
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Yu Y, Hagihara M, Ando K, Gansuvd B, Matsuzawa H, Tsuchiya T, Ueda Y, Inoue H, Hotta T, Kato S. Enhancement of human cord blood CD34+ cell-derived NK cell cytotoxicity by dendritic cells. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 166:1590-600. [PMID: 11160200 DOI: 10.4049/jimmunol.166.3.1590] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
NK cells and dendritic cells (DCs) are both important in the innate host defense. However, the role of DCs in NK cell-mediated cytotoxicity is unclear. In this study, we designed two culture systems in which human cord blood CD34(+) cells from the same donor were induced to generate NK cells and DCs, respectively. Coculture of the NK cells with DCs resulted in significant enhancement of NK cell cytotoxicity and IFN-gamma production. However, NK cell cytotoxicity and IFN-gamma production were not increased when NK cells and DCs were grown together separated by a transwell membrane. Functional studies demonstrated that 1) concanamycin A, a selective inhibitor of perforin/granzyme B-based cytolysis, blocked DC-stimulated NK cytotoxicity against K562 cells; and 2) neutralizing mAb against Fas ligand (FasL) significantly reduced DC-stimulated NK cytotoxicity against Fas-positive Jurkat cells. In addition, a marked increase of FasL mRNA and FasL protein expression was observed in DC-stimulated NK cells. The addition of neutralizing mAb against IL-18 and IL-12 significantly suppressed DC-stimulated NK cell cytotoxicity. Neutralizing IFN-gamma Ab almost completely inhibited NK cell cytotoxicity against Jurkat cells. These observations suggest that DCs enhance NK cell cytotoxicity by up-regulating both perforin/granzyme B- and FasL/Fas-based pathways. Direct interaction between DCs and NK cells is necessary for DC-mediated enhancement of NK cell cytotoxicity. Furthermore, DC-derived IL-18 and IL-12 were involved in the up-regulation of NK cell cytotoxicity, and endogenous IFN-gamma production plays an important role in Fas-mediated cytotoxicity.
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MESH Headings
- Anti-Bacterial Agents/pharmacology
- Antibodies, Monoclonal/pharmacology
- Antigens, CD34/biosynthesis
- CD40 Antigens/physiology
- Cells, Cultured
- Coculture Techniques
- Cytoplasm/immunology
- Cytoplasm/metabolism
- Cytotoxicity Tests, Immunologic
- Cytotoxicity, Immunologic/drug effects
- Cytotoxicity, Immunologic/immunology
- Dendritic Cells/cytology
- Dendritic Cells/drug effects
- Dendritic Cells/immunology
- Dendritic Cells/metabolism
- Drug Combinations
- Enzyme Inhibitors/pharmacology
- Fas Ligand Protein
- Fetal Blood/cytology
- Fetal Blood/immunology
- Granzymes
- Humans
- Immunophenotyping
- Interferon-gamma/antagonists & inhibitors
- Interferon-gamma/biosynthesis
- Interferon-gamma/immunology
- Interferon-gamma/physiology
- Interleukin-12/antagonists & inhibitors
- Interleukin-12/biosynthesis
- Interleukin-12/immunology
- Interleukin-12/physiology
- Interleukin-18/antagonists & inhibitors
- Interleukin-18/biosynthesis
- Interleukin-18/immunology
- Interleukin-18/physiology
- Jurkat Cells
- K562 Cells
- Killer Cells, Natural/cytology
- Killer Cells, Natural/drug effects
- Killer Cells, Natural/immunology
- Killer Cells, Natural/metabolism
- Ligands
- Lymphocyte Activation/drug effects
- Lymphocyte Activation/immunology
- Macrolides
- Membrane Glycoproteins/biosynthesis
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/immunology
- Perforin
- Pore Forming Cytotoxic Proteins
- RNA, Messenger/biosynthesis
- Serine Endopeptidases/biosynthesis
- Serine Endopeptidases/genetics
- fas Receptor/metabolism
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Affiliation(s)
- Y Yu
- Research Center for Cell Transplantation, Department of Pediatrics, Tokai University, School of Medicine, Kanagawa, Japan
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50
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O'Connell J, Bennett MW, Nally K, O'Sullivan GC, Collins JK, Shanahan F. Interferon-gamma sensitizes colonic epithelial cell lines to physiological and therapeutic inducers of colonocyte apoptosis. J Cell Physiol 2000; 185:331-8. [PMID: 11056003 DOI: 10.1002/1097-4652(200012)185:3<331::aid-jcp3>3.0.co;2-v] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Homeostasis in the colonic epithelium is achieved by a continuous cycle of proliferation and apoptosis, in which imbalances are associated with disease. Inflammatory bowel disease (IBD) and colon cancer are associated with either excessive or insufficient apoptosis of colonic epithelial cells, respectively. By using two colonic epithelial cell lines, HT29 and SW620, we investigated how the epithelial cell's sensitivity to apoptosis was regulated by the proinflammatory cytokine interferon-gamma (IFN-gamma). We found that IFN-gamma sensitized HT29 cells, and to a lesser extent SW620, to diverse inducers of apoptosis of physiologic or therapeutic relevance to the colon. These apoptosis inducers included Fas (CD95/APO-1) ligand (FasL), short-chain fatty acids, and chemotherapeutic drugs. The extent of IFN-gamma-mediated apoptosis sensitization in these two cell lines correlated well with the degree of IFN-gamma-mediated upregulation of the proapoptotic protease caspase-1. Although IFN-gamma alone effectively sensitized HT29 cells to apoptosis, inclusion of the protein synthesis inhibitor cyclohexamide (CHX) during apoptotic challenge was necessary for maximal sensitization of SW620. The requirement of CHX to sensitize SW620 cells to apoptosis implies a need to inhibit translation of antiapoptotic proteins absent from HT29. In particular, the antiapoptotic protein Bcl-2 was strongly expressed in SW620 cells but absent from HT29. Our results indicate that IFN-gamma increases the sensitivity of colonic epithelial cells to diverse apoptotic stimuli in concert, via upregulation of caspase-1. Our findings implicate caspase-1 and Bcl-2 as important central points of control determining the general sensitivity of colonic epithelial cells to apoptosis.
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Affiliation(s)
- J O'Connell
- Department of Medicine, Cork University Hospital, National University of Ireland, Cork, Ireland.
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