1
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Interleukin-31 and soluble CD40L: new candidate serum biomarkers that predict therapeutic response in multiple sclerosis. Neurol Sci 2022; 43:6271-6278. [DOI: 10.1007/s10072-022-06276-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 07/11/2022] [Indexed: 11/25/2022]
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2
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Sharanek A, Burban A, Laaper M, Heckel E, Joyal JS, Soleimani VD, Jahani-Asl A. OSMR controls glioma stem cell respiration and confers resistance of glioblastoma to ionizing radiation. Nat Commun 2020; 11:4116. [PMID: 32807793 PMCID: PMC7431428 DOI: 10.1038/s41467-020-17885-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 07/22/2020] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma contains a rare population of self-renewing brain tumor stem cells (BTSCs) which are endowed with properties to proliferate, spur the growth of new tumors, and at the same time, evade ionizing radiation (IR) and chemotherapy. However, the drivers of BTSC resistance to therapy remain unknown. The cytokine receptor for oncostatin M (OSMR) regulates BTSC proliferation and glioblastoma tumorigenesis. Here, we report our discovery of a mitochondrial OSMR that confers resistance to IR via regulation of oxidative phosphorylation, independent of its role in cell proliferation. Mechanistically, OSMR is targeted to the mitochondrial matrix via the presequence translocase-associated motor complex components, mtHSP70 and TIM44. OSMR interacts with NADH ubiquinone oxidoreductase 1/2 (NDUFS1/2) of complex I and promotes mitochondrial respiration. Deletion of OSMR impairs spare respiratory capacity, increases reactive oxygen species, and sensitizes BTSCs to IR-induced cell death. Importantly, suppression of OSMR improves glioblastoma response to IR and prolongs lifespan. The suppression of the receptor for oncostatin M (OSMR) can prevent glioblastoma cell growth. Here, the authors demonstrate a role for OSMR in modulating glioma stem cell respiration and its impact on resistance to ionizing radiation.
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Affiliation(s)
- Ahmad Sharanek
- Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Chemin de la Côte-Sainte-Catherine, Montréal, QC, H3T 1E2, Canada
| | - Audrey Burban
- Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Chemin de la Côte-Sainte-Catherine, Montréal, QC, H3T 1E2, Canada
| | - Matthew Laaper
- Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Chemin de la Côte-Sainte-Catherine, Montréal, QC, H3T 1E2, Canada.,Integrated program in Neuroscience, Montreal Neurological Institute, 3801 University Street, Montréal, QC, H3A 2B4, Canada
| | - Emilie Heckel
- Departments of Pediatrics, Pharmacology and Ophthalmology, Université de Montréal, CHU Sainte-Justine, Montréal, QC, H3T 1C5, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, H3G 1Y6, Canada
| | - Jean-Sebastien Joyal
- Departments of Pediatrics, Pharmacology and Ophthalmology, Université de Montréal, CHU Sainte-Justine, Montréal, QC, H3T 1C5, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, H3G 1Y6, Canada
| | - Vahab D Soleimani
- Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Chemin de la Côte-Sainte-Catherine, Montréal, QC, H3T 1E2, Canada.,Department of Human Genetics, McGill University, 3640 Rue University, Montréal, QC, H3A OC7, Canada
| | - Arezu Jahani-Asl
- Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 Chemin de la Côte-Sainte-Catherine, Montréal, QC, H3T 1E2, Canada. .,Integrated program in Neuroscience, Montreal Neurological Institute, 3801 University Street, Montréal, QC, H3A 2B4, Canada. .,Gerald Bronfman Department of Oncology and Division of Experimental Medicine, McGill University, 5100 Maisonneuve Blvd West, Suite 720, H4A3T2, Montréal, QC, Canada.
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3
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Mohammadi C, Sameri S, Najafi R. Insight into adipokines to optimize therapeutic effects of stem cell for tissue regeneration. Cytokine 2020; 128:155003. [PMID: 32000014 DOI: 10.1016/j.cyto.2020.155003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 01/18/2020] [Accepted: 01/20/2020] [Indexed: 11/29/2022]
Abstract
Stem cell therapy is considered as a promising regenerative medicine for repairing and treating damaged tissues and/or preventing various diseases. But there are still some obstacles such as low cell migration, poor stem cell engraftment and decreased cell survival that need to be overcome before transplantation. Therefore, a large body of studies has focused on improving the efficiency of stem cell therapy. For instance, preconditioning of stem cells has emerged as an effective strategy to reinforce therapeutic efficacy. Adipokines are signaling molecules, secreted by adipose tissue, which regulate a variety of biological processes in adipose tissue and other organs including the brain, liver, and muscle. In this review article, we shed light on the biological effects of some adipokines including apelin, oncostatin M, omentin-1 and vaspin on stem cell therapy and the most recent preclinical advances in our understanding of how these functions ameliorate stem cell therapy outcome.
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Affiliation(s)
- Chiman Mohammadi
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Saba Sameri
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Rezvan Najafi
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran.
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4
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Leifheit-Nestler M, Haffner D. Paracrine Effects of FGF23 on the Heart. Front Endocrinol (Lausanne) 2018; 9:278. [PMID: 29892269 PMCID: PMC5985311 DOI: 10.3389/fendo.2018.00278] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 05/11/2018] [Indexed: 12/17/2022] Open
Abstract
Fibroblast growth factor (FGF) 23 is a phosphaturic hormone primarily secreted by osteocytes to maintain phosphate and mineral homeostasis. In patients with and without chronic kidney disease, enhanced circulating FGF23 levels associate with pathologic cardiac remodeling, i.e., left ventricular hypertrophy (LVH) and myocardial fibrosis and increased cardiovascular mortality. Experimental studies demonstrate that FGF23 promotes hypertrophic growth of cardiac myocytes via FGF receptor 4-dependent activation of phospholipase Cγ/calcineurin/nuclear factor of activated T cell signaling independent of its co-receptor klotho. Recent studies indicate that FGF23 is also expressed in the heart, and markedly enhanced in various clinical and experimental settings of cardiac remodeling and heart failure independent of preserved or reduced renal function. On a cellular level, FGF23 is expressed in cardiac myocytes and in other non-cardiac myocytes, including cardiac fibroblasts, vascular smooth muscle and endothelial cells in coronary arteries, and in inflammatory macrophages. Current data suggest that secreted by cardiac myocytes, FGF23 can stimulate pro-fibrotic factors in myocytes to induce fibrosis-related pathways in fibroblasts and consequently cardiac fibrosis in a paracrine manner. While acting on cardiac myocytes, FGF23 directly induces pro-hypertrophic genes and promotes the progression of LVH in an autocrine and paracrine fashion. Thus, enhanced FGF23 may promote cardiac injury in various clinical settings not only by endocrine but also via paracrine/autocrine mechanisms. In this review, we discuss recent clinical and experimental data regarding molecular mechanisms of FGF23's paracrine action on the heart with respect to pathological cardiac remodeling.
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5
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Moidunny S, Matos M, Wesseling E, Banerjee S, Volsky DJ, Cunha RA, Agostinho P, Boddeke HW, Roy S. Oncostatin M promotes excitotoxicity by inhibiting glutamate uptake in astrocytes: implications in HIV-associated neurotoxicity. J Neuroinflammation 2016; 13:144. [PMID: 27287400 PMCID: PMC4903004 DOI: 10.1186/s12974-016-0613-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 06/06/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Elevated levels of oncostatin M (OSM), an interleukin-6 cytokine family member, have been observed in HIV-1-associated neurocognitive disorders (HAND) and Alzheimer's disease. However, the function of OSM in these disease conditions is unclear. Since deficient glutamate uptake by astrocytes is instrumental in HAND-associated neurotoxicity, we hypothesized that OSM impairs glutamate uptake in astrocytes and thereby promotes neuronal excitotoxicity. METHODS Primary cultures of mouse cortical astrocytes, neurons, microglia, and BV2 cell line were used. The expression of glutamate transporters (GLAST/EAAT1 and GLT-1/EAAT2) was investigated using real-time PCR and Western blot, and their activity was assessed by measuring (3)H-D-aspartate uptake. Neuronal toxicity was measured using the colorimetric MTT (3-(4,5-dimethylthiazol-2-yl-) 2,5-diphenyltetrazolium bromide) assay and immunocytochemistry. A chimeric HIV-1 that infects murine cells (EcoHIV/NL4-3-GFP virus (EcoHIV)) was used to investigate whether the virus induces OSM, OSM receptor (OSMR)-β, glycoprotein 130 (gp130), GLT-1, GLAST (mRNA and protein), and OSM release (ELISA) in cultured BV2 cells, primary microglia, or astrocytes. Statistical analyses of the data were performed using one-way ANOVA (to allow multiple comparisons) and two-tailed Student's t test. RESULTS OSM treatment (10 ng/mL) time-dependently reduced GLAST and GLT-1 expression and inhibited (3)H-D-aspartate uptake in cultured astrocytes in a concentration-dependent manner, an effect prevented by the Janus kinase (JAK)/signal transducers and activators of transcription (STAT)3 inhibitor AG490. Down-regulation of astrocytic glutamate transport by OSM resulted in NMDA receptor-dependent excitotoxicity in cortical neurons. Infection with EcoHIV induced OSM gene expression and protein release in BV2 cells and microglia, but not in astrocytes. Conversely, EcoHIV caused a fivefold increase in OSMR-β mRNA (but not gp130) and protein in astrocytes, but not in microglia, which did not express OSMR-β protein. Finally, astrocytic expression of GLAST gene was unaffected by EcoHIV, whereas GLT-1 mRNA was increased by twofold. CONCLUSIONS We provide first evidence that activation of JAK/STAT3 signaling by OSM inhibits glutamate uptake in astrocytes, which results in neuronal excitotoxicity. Our findings with EcoHIV suggest that targeting OSMR-β signaling in astrocytes might alleviate HIV-1-associated excitotoxicity.
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Affiliation(s)
- Shamsudheen Moidunny
- Department of Surgery, Division of Basic and Translational Research, University of Minnesota, Minneapolis, MN, USA
| | - Marco Matos
- Center for Neuroscience of Coimbra, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Evelyn Wesseling
- Department of Neuroscience, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Santanu Banerjee
- Department of Surgery, Division of Basic and Translational Research, University of Minnesota, Minneapolis, MN, USA
| | - David J Volsky
- Molecular Virology Division, St. Luke's-Roosevelt Hospital Center, New York, USA
| | - Rodrigo A Cunha
- Center for Neuroscience of Coimbra, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Paula Agostinho
- Center for Neuroscience of Coimbra, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Hendrikus W Boddeke
- Department of Neuroscience, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Sabita Roy
- Department of Surgery, Division of Basic and Translational Research, University of Minnesota, Minneapolis, MN, USA. .,Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA.
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6
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Dey G, Radhakrishnan A, Syed N, Thomas JK, Nadig A, Srikumar K, Mathur PP, Pandey A, Lin SK, Raju R, Prasad TSK. Signaling network of Oncostatin M pathway. J Cell Commun Signal 2013; 7:103-8. [PMID: 23255051 PMCID: PMC3660694 DOI: 10.1007/s12079-012-0186-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 12/03/2012] [Indexed: 12/23/2022] Open
Affiliation(s)
- Gourav Dey
- />Institute of Bioinformatics, International Tech Park, Whitefield, Bangalore, 560 066 India
| | - Aneesha Radhakrishnan
- />Institute of Bioinformatics, International Tech Park, Whitefield, Bangalore, 560 066 India
- />Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, 605 014 India
| | - Nazia Syed
- />Institute of Bioinformatics, International Tech Park, Whitefield, Bangalore, 560 066 India
- />Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, 605 014 India
| | - Joji Kurian Thomas
- />Institute of Bioinformatics, International Tech Park, Whitefield, Bangalore, 560 066 India
- />School of Biotechnology, Amrita Vishwa Vidhyapeetam, Kollam, 690 525 India
| | - Arpitha Nadig
- />Department of Bioinformatics, Kuvempu University, Karnataka Shankaraghatta, 577 451 India
| | - Kotteazeth Srikumar
- />Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, 605 014 India
| | - Premendu Prakash Mathur
- />Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, 605 014 India
- />KIIT University, Bhubaneswar, 751 024 India
| | - Akhilesh Pandey
- />McKusick-Nathans Institute of Genetic Medicine and Departments of Biological Chemistry, Pathology and Oncology, Johns Hopkins University School of Medicine, Baltimore, MD 21205 USA
| | - Sze-Kwan Lin
- />School of Dentistry, College of Medicine, National Taiwan University, 1 Chang-Te Street, Taipei, 10016 Taiwan
| | - Rajesh Raju
- />Institute of Bioinformatics, International Tech Park, Whitefield, Bangalore, 560 066 India
| | - T. S. Keshava Prasad
- />Institute of Bioinformatics, International Tech Park, Whitefield, Bangalore, 560 066 India
- />School of Biotechnology, Amrita Vishwa Vidhyapeetam, Kollam, 690 525 India
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7
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Genomic profiling combined with gene expression profiling in primary central nervous system lymphoma. Blood 2010; 117:1291-300. [PMID: 21088137 DOI: 10.1182/blood-2010-07-297861] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Of the genetic changes in primary central nervous system lymphoma (PCNSL), little is known. To detect copy number alterations and differentially expressed genes in PCNSL, we analyzed a total of 12 PCNSL samples with high-resolution array-based comparative genomic hybridization and performed expression profiling in 7 of the 12 samples. The most frequent deletion found in 8 patients (66.7%) occurred in 9p21.3 containing CDKN2A. We compiled the top 96 genes (family-wise error rate, P < .05) showing the greatest differential expression between PCNSL and normal lymph node tissues. From these, we selected 8 candidate genes (NPFFR2, C4orf7, OSMR, EMCN, TPO, FNDC1, COL12A1, and MSC) in which expression changes were associated with copy number aberrations. All 8 genes showed both down-regulation in expression microarray and deletion in array-based comparative genomic hybridization analyses. These genes participate in cell signaling or cell adhesion. In addition, low mRNA expression of C4orf7 was significantly associated with poor survival (P = .0425). Using gene set enrichment analysis, we identified several signal transduction pathways, such as Janus kinase-signal transducers and activators of transcription pathway and adhesion-related pathways, which may be involved in pathogenesis of PCNSL. In conclusion, this study identified novel tumor suppressor genes that may serve as therapeutic targets of PCNSL.
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8
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Damiani CL, O'Callaghan JP. Recapitulation of cell signaling events associated with astrogliosis using the brain slice preparation. J Neurochem 2007; 100:720-6. [PMID: 17176261 DOI: 10.1111/j.1471-4159.2006.04321.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Astroglial activation constitutes a dominant response to all types of injuries of the CNS. Despite the ubiquitous nature of this cellular reaction to neural injury, a little is known concerning the signaling mechanisms that initiate it. Recently, we demonstrated that astrocytic hypertrophy and enhanced expression of glial fibrillary acidic protein resulting from toxicant-induced neurodegeneration are linked to activation of the janus kinase (JAK)-signal transducer and activator of transcription-3 (STAT3) pathway. These observations implicate ligands at the gp130 receptor as potential upstream effectors of astrogliosis. Here we used the brain slice preparation to examine potential activators of the JAK-STAT3 pathway. Following incubation of freshly cut striatal slices in phosphate-free oxygenated buffer for up to 75 min, we found that slicing the striatum itself was a sufficient stimulus to initiate a rapid activation of the JAK-STAT3 pathway as assessed with immunoblots of pSTAT3((tyr705)) using phospho-state specific antibodies. The mRNA for the gp130 cytokines, leukemia inhibitory factor, interleukin-6 and oncostatin M or the beta-chemokine, monocyte chemoattractive protein (CCl2) also were up-regulated in the slice. Moreover, we could enhance the activation of STAT3((tyr705)) by adding exogenous cytokines to the slice and we could inhibit phosphorylation of STAT3((tyr705)) by addition of tyrosine kinase inhibitors (Lav A and AG490) or neutralizing antibodies directed against leukemia inhibitory factor or oncostatin M. These data suggest that STAT3 activation is an early event in slice-induced glial activation and establishes the brain slice preparation method as a reliable model to examine the signaling mechanisms that underlie glial activation.
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Affiliation(s)
- Candice L Damiani
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health (CDC-NIOSH), Morgantown, WV 26505, USA
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9
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Proietti C, Salatino M, Rosemblit C, Carnevale R, Pecci A, Kornblihtt AR, Molinolo AA, Frahm I, Charreau EH, Schillaci R, Elizalde PV. Progestins induce transcriptional activation of signal transducer and activator of transcription 3 (Stat3) via a Jak- and Src-dependent mechanism in breast cancer cells. Mol Cell Biol 2005; 25:4826-40. [PMID: 15923602 PMCID: PMC1140598 DOI: 10.1128/mcb.25.12.4826-4840.2005] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Interactions between steroid hormone receptors and signal transducer and activator of transcription (Stat)-mediated signaling pathways have already been described. In the present study, we explored the capacity of progestins to modulate Stat3 transcriptional activation in an experimental model of hormonal carcinogenesis in which the synthetic progestin medroxyprogesterone acetate (MPA) induced mammary adenocarcinomas in BALB/c mice and in the human breast cancer cell line T47D. We found that C4HD epithelial cells, from the MPA-induced mammary tumor model, expressed Stat3 and that MPA treatment of C4HD cells up-regulated Stat3 protein expression. In addition, MPA induced rapid, nongenomic Stat3, Jak1, and Jak2 tyrosine phosphorylation in C4HD and T47D cells. MPA treatment of C4HD cells also resulted in rapid c-Src tyrosine phosphorylation. These effects were completely abolished by the progestin antagonist RU486. Abrogation of Jak1 and Jak2 activity by transient transfection of C4HD cells with dominant negative (DN) Jak1 or DN Jak2 vectors, or inhibition of Src activity by preincubation of cells with the Src family kinase inhibitor PP2, blocked the capacity of MPA to induce Stat3 phosphorylation. Treatment of C4HD cells with MPA induced Stat3 binding to DNA. In addition, MPA promoted strong Stat3 transcriptional activation in C4HD and T47D cells that was inhibited by RU486 and by blockage of Jak1, Jak2, and Src activities. To investigate the correlation between MPA-induced Stat3 activation and cell growth, C4HD cells were transiently transfected with a DN Stat3 expression vector, Stat3Y705-F, or with a constitutively activated Stat3 mutant, Stat3-C. While expression of Stat3Y705-F mutant had an inhibitory effect on MPA-induced growth of C4HD cells, transfection with the constitutively activated Stat3-C vector resulted in MPA-independent proliferation. Finally, we addressed the effect of targeting Stat3 in in vivo growth of C4HD breast tumors. Blockage of Stat3 activation by transfection of C4HD cells with the DN Stat3Y705-F expression vector significantly inhibited these cells' ability to form tumors in syngeneic mice. Our results have for the first time demonstrated that progestins are able to induce Stat3 transcriptional activation, which is in turn an obligatory requirement for progestin stimulation of both in vitro and in vivo breast cancer growth.
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Affiliation(s)
- Cecilia Proietti
- Instituto de Biología y Medicina Experimental (IBYME), CONICET, Buenos Aires 1428, Argentina
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10
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Chen SH, Benveniste EN. Oncostatin M: a pleiotropic cytokine in the central nervous system. Cytokine Growth Factor Rev 2005; 15:379-91. [PMID: 15450253 DOI: 10.1016/j.cytogfr.2004.06.002] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Oncostatin M (OSM), a member of the interleukin-6 (IL-6) cytokine family, has yet to be well studied, especially in the context of the central nervous system (CNS). The biological functions of OSM are complex and variable, depending on the cellular microenvironment. Inflammatory responses and tumor development are among two of the major events that OSM is involved in. Although OSM levels remain low in the normal CNS, elevated expression occurs in pathological conditions. Therefore, it is crucial to understand the regulation of OSM to control its expression and/or its effects. Accumulating data demonstrate that OSM binds to specific receptor complexes, then activates two major signaling pathways: Janus Kinase-Signal Transducers and Activators of Transcription (JAK-STAT) and Mitogen-Activated Protein Kinase (MAPK), to regulate downstream events. In this review, we focus on the biological functions of OSM, the signaling pathways of OSM in the CNS, and OSM involvement in CNS diseases.
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Affiliation(s)
- Shao-Hua Chen
- Department of Cell Biology, MCLM 386, University of Alabama at Birmingham, 1918 University Boulevard, Birmingham, AL 35294-0005, USA.
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11
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Sriram K, Benkovic SA, Hebert MA, Miller DB, O'Callaghan JP. Induction of gp130-related Cytokines and Activation of JAK2/STAT3 Pathway in Astrocytes Precedes Up-regulation of Glial Fibrillary Acidic Protein in the 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine Model of Neurodegeneration. J Biol Chem 2004; 279:19936-47. [PMID: 14996842 DOI: 10.1074/jbc.m309304200] [Citation(s) in RCA: 207] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Reactive gliosis is a hallmark of disease-, trauma-, and chemical-induced damage to the central nervous system. The signaling pathways associated with this response to neural injury remain to be elucidated, but recent evidence implicates the Janus kinase (JAK)-signal transducer and activator of transcription (STAT) pathway. Here, we used the known dopaminergic neurotoxicant, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), to selectively damage striatal dopaminergic nerve terminals and elicit a glial response. We then analyzed changes in gene expression and protein phosphorylation, in vivo, to identify ligands and mediators of the JAK-STAT pathway that accompany glial activation. Administration of MPTP caused rapid tyrosine (Tyr-705) phosphorylation and nuclear translocation of STAT3 in striatal astrocytes, prior to the induction of glial fibrillary acidic protein mRNA and protein. Pharmacological protection of dopaminergic nerve terminals with nomifensine abolished MPTP-mediated phosphorylation and translocation of STAT3 and prevented induction of astrogliosis. Among the Janus kinase family of tyrosine kinases, only JAK2 was associated with the phosphorylation of STAT3 after MPTP and, inhibition of JAK2 by AG490, in vivo, attenuated both the phosphorylation of STAT3 and induction of GFAP. The p44/42 mitogen-activated protein kinase (MAPK; ERK1/2) also was activated by MPTP, but was not associated with activation of STAT3, because serine (Ser-727) was not phosphorylated. The mRNA for ligands of the gp130-JAK/STAT3 signaling pathway, interleukin-6, leukemia inhibitory factor, and oncostatin M were elevated prior to activation of STAT3 and induction of astrogliosis; neuroprotection with nomifensine blocked these effects of MPTP. Taken together, our results suggest that the gp130-mediated activation of JAK2/STAT3 signaling pathway may play a key role in the induction of astrogliosis.
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MESH Headings
- 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine/pharmacology
- Active Transport, Cell Nucleus
- Animals
- Antigens, CD/biosynthesis
- Astrocytes/metabolism
- Astrocytes/physiology
- Chromatography, High Pressure Liquid
- Cytokine Receptor gp130
- DNA, Complementary/metabolism
- DNA-Binding Proteins/metabolism
- Dimerization
- Dopamine/metabolism
- Dopamine Agents/pharmacology
- Dopamine Uptake Inhibitors/pharmacology
- Enzyme Activation
- Enzyme-Linked Immunosorbent Assay
- Gene Expression Regulation
- Glial Fibrillary Acidic Protein/metabolism
- Immunoblotting
- Immunohistochemistry
- Interleukin-6/metabolism
- Janus Kinase 2
- Leukemia Inhibitory Factor
- Ligands
- MAP Kinase Signaling System
- Male
- Membrane Glycoproteins/biosynthesis
- Mice
- Mice, Inbred C57BL
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3
- Mitogen-Activated Protein Kinases/metabolism
- Models, Biological
- Nomifensine/pharmacology
- Oncostatin M
- Peptides/metabolism
- Phosphorylation
- Protein Transport
- Protein-Tyrosine Kinases/metabolism
- Proto-Oncogene Proteins
- RNA/metabolism
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- STAT3 Transcription Factor
- Signal Transduction
- Time Factors
- Tissue Distribution
- Trans-Activators/metabolism
- Tyrosine/metabolism
- Up-Regulation
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Affiliation(s)
- Krishnan Sriram
- HELD/TMBB, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505, USA
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12
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Repovic P, Fears CY, Gladson CL, Benveniste EN. Oncostatin-M induction of vascular endothelial growth factor expression in astroglioma cells. Oncogene 2003; 22:8117-24. [PMID: 14603252 DOI: 10.1038/sj.onc.1206922] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Oncostatin-M (OSM), a hematopoietic cytokine, and vascular endothelial growth factor (VEGF), a quintessential angiogenic signal, are coexpressed in development, cancer and inflammation. Here, we report that OSM treatment of human astroglioma cell lines increases VEGF levels by approximately threefold. Interleukin-1beta (IL-1beta), in combination with OSM, induces up to sevenfold higher VEGF expression, without significantly inducing VEGF on its own. Specifically examining the OSM contribution to VEGF expression, neutralizing antibodies to OSM receptor subunits gp130 and OSMRbeta, but not LIFRbeta, inhibited OSM induction of VEGF, indicating that the OSM-specific receptor OSMRbeta/gp130 transduces the OSM signal for VEGF synthesis. OSM induction of VEGF promoter activity maps to the (-1171, -786) region of the VEGF promoter, which contains a STAT-3-binding site. STAT-3 is indeed essential for this response, since overexpression of a dominant-negative STAT-3 blocks OSM induction of VEGF promoter activity, as well as endogenous VEGF expression. Finally, we demonstrate that OSM is expressed in glioblastoma multiforme tumor biopsies, a particularly malignant form of brain tumor. This novel mechanism of VEGF regulation in astroglioma cells may be active in pathophysiological states where both OSM and IL-1beta are present.
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Affiliation(s)
- Pavle Repovic
- Department of Cell Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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13
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Repovic P, Mi K, Benveniste EN. Oncostatin M enhances the expression of prostaglandin E2 and cyclooxygenase-2 in astrocytes: synergy with interleukin-1beta, tumor necrosis factor-alpha, and bacterial lipopolysaccharide. Glia 2003; 42:433-46. [PMID: 12730964 DOI: 10.1002/glia.10182] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Oncostatin M (OSM), a cytokine of the interleukin-6 family, is expressed in rheumatoid arthritis, multiple sclerosis, multiple myeloma, and other inflammatory and neoplastic conditions. Prostaglandin E(2) (PGE(2)), an eicosanoid also associated with inflammation and cancer, has recently been shown to induce OSM expression. We report here that OSM in turn induces PGE(2) production by astrocytes and astroglioma cells. More importantly, in combination with the inflammatory mediators IL-1beta, tumor necrosis factor-alpha, and lipopolysaccharide, OSM exhibits a striking synergy, resulting in up to 50-fold higher PGE(2) production by astrocytes, astroglioma, and neuroblastoma cell lines. Enhanced PGE(2) production by OSM and IL-1beta treatment is explained by their effect on cyclooxygenase-2 (COX-2), an enzyme that catalyzes the committed step in PGE(2) synthesis. Of the enzymes involved in PGE(2) biosynthesis, only COX-2 mRNA and protein levels are synergistically amplified by OSM and IL-1beta. Nuclear run-on assays demonstrate that OSM and IL-1beta synergistically upregulate transcription of the COX-2 gene, and the mRNA stability assay indicates that COX-2 mRNA is posttranscriptionally stabilized by OSM and IL-1beta. To effect synergy on the PGE(2) level, OSM signals in part through its gp130/OSMRbeta receptor, since neutralizing antibodies against gp130 and OSMRbeta, but not LIFRbeta, decrease PGE(2) production in response to OSM plus IL-1beta. SB202190 and U0126, inhibitors of p38 MAPK and ERK1/2 activation, respectively, inhibit IL-1beta and OSM upregulation of COX-2 and PGE(2), indicating that these MAPK cascades are utilized by both stimuli. This mechanism of PGE(2) amplification may be active in brain pathologies where both OSM and IL-1beta are present, such as glioblastomas and multiple sclerosis.
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Affiliation(s)
- Pavle Repovic
- Department of Cell Biology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
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Zhang F, Li C, Halfter H, Liu J. Delineating an oncostatin M-activated STAT3 signaling pathway that coordinates the expression of genes involved in cell cycle regulation and extracellular matrix deposition of MCF-7 cells. Oncogene 2003; 22:894-905. [PMID: 12584569 DOI: 10.1038/sj.onc.1206158] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A number of studies have demonstrated that the STAT pathway is an important signaling cascade utilized by the IL-6 cytokine family to regulate a variety of cell functions. However, the downstream target genes of STAT activation that mediate the cytokine-induced cellular responses are largely uncharacterized. The aims of the current study are to determine whether the STAT signaling pathway is critically involved in the oncostatin M (OM)-induced growth inhibition and morphological changes of MCF-7 cells and to identify STAT3-target genes that are utilized by OM to regulate cell growth and morphology. We show that expression of a dominant negative (DN) mutant of STAT3 in MCF-7 cells completely eliminated the antiproliferative activity of OM, whereas expression of DN STAT1 had no effect. The growth inhibition of breast cancer cells was achieved through a concerted action of OM on cell cycle components. We have identified four cell cycle regulators including c-myc, cyclin D1, c/EBPdelta, and p53 as downstream effectors of the OM-activated STAT3 signaling cascade. The expression of these genes is differentially regulated by OM in MCF-7 cells, but is unaffected by OM in MCF-7-dnStat3 stable clones. We also demonstrate that the OM-induced morphological changes are correlated with increased cell motility in a STAT3-dependent manner. Expression analysis of extracellular matrix (ECM) proteins leads to the identification of fibronectin as a novel OM-regulated ECM component. Our studies further reveal that STAT3 plays a key role in the robust induction of fibronectin expression by OM in MCF-7 and T47D cells. These new findings provide a molecular basis for the mechanistic understanding of the effects of OM on cell growth and migration.
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Affiliation(s)
- Fang Zhang
- Department of Veterans Affairs Palo Alto Health Care System, CA 94304, USA
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Schaefer LK, Ren Z, Fuller GN, Schaefer TS. Constitutive activation of Stat3alpha in brain tumors: localization to tumor endothelial cells and activation by the endothelial tyrosine kinase receptor (VEGFR-2). Oncogene 2002; 21:2058-65. [PMID: 11960378 DOI: 10.1038/sj.onc.1205263] [Citation(s) in RCA: 148] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2001] [Revised: 12/11/2001] [Accepted: 12/18/2001] [Indexed: 11/09/2022]
Abstract
Members of the normally latent family of transcription factors signal/inducers and activators of transcription (Stat) are activated in a number of human tumors and tumor-derived cell lines. In the case of Stat3, it is believed that this activation leads to the induction of survival signals as well as increased proliferation. In this study, we demonstrate that Stat3 is constitutively activated in glioma and medulloblastoma tumors and that the activated protein localizes predominantly to the tumor endothelial cells in the highly vascularized glioma tumors. Our efforts to elucidate potential mechanism(s) for this activated protein have shown that coexpression of Stat3alpha and the vascular endothelial growth factor receptor-2 (VEGFR-2) result in ligand-independent activation of Stat3alpha tyrosine phosphorylation and subsequent transcriptional activation in non-endothelial cells. We also show that activated Stat3alpha can increase transcription from the vascular endothelial growth factor (VEGF) gene. Taken together, these results suggest that the activated Stat3alpha found in brain tumors may be due to the endothelial tyrosine kinase VEGFR-2 and that Stat3alpha may play a central role in autocrine VEGF activation.
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Affiliation(s)
- Laura K Schaefer
- Department of Neurosurgery, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, TX 77030, USA.
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