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Zhang Y, Liu S, Wang H, Yang W, Li F, Yang F, Yu D, Ramsey FV, Tuszyski GP, Hu W. Elevated NIBP/TRAPPC9 mediates tumorigenesis of cancer cells through NFκB signaling. Oncotarget 2016; 6:6160-78. [PMID: 25704885 PMCID: PMC4467429 DOI: 10.18632/oncotarget.3349] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 01/20/2015] [Indexed: 12/21/2022] Open
Abstract
Regulatory mechanisms underlying constitutive and inducible NFκB activation in cancer remain largely unknown. Here we investigated whether a novel NIK- and IKK2-binding protein (NIBP) is required for maintaining malignancy of cancer cells in an NFκB-dependent manner. Real-time polymerase chain reaction analysis of a human cancer survey tissue-scan cDNA array, immunostaining of a human frozen tumor tissue array and immunoblotting of a high-density reverse-phase cancer protein lysate array showed that NIBP is extensively expressed in most tumor tissues, particularly in breast and colon cancer. Lentivirus-mediated NIBP shRNA knockdown significantly inhibited the growth/proliferation, invasion/migration, colony formation and xenograft tumorigenesis of breast (MDA-MB-231) or colon (HCT116) cancer cells. NIBP overexpression in HCT116 cells promoted cell proliferation, migration and colony formation. Mechanistically, NIBP knockdown in cancer cells inhibited cytokine-induced activation of NFκB luciferase reporter, thus sensitizing the cells to TNFα-induced apoptosis. Endogenous NIBP bound specifically to the phosphorylated IKK2 in a TNFα-dependent manner. NIBP knockdown transiently attenuated TNFα-stimulated phosphorylation of IKK2/p65 and degradation of IκBα. In contrast, NIBP overexpression enhanced TNFα-induced NFκB activation, thus inhibiting constitutive and TNFα-induced apoptosis. Collectively, our data identified important roles of NIBP in promoting tumorigenesis via NFκΒ signaling, spotlighting NIBP as a promising target in cancer therapeutic intervention.
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Affiliation(s)
- Yonggang Zhang
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA, USA
| | - Shu Liu
- Department of Biotherapy, The Forth Affiliated Hospital, China Medical University, Shenyang, Liaoning, China
| | - Hong Wang
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA, USA
| | - Wensheng Yang
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA, USA
| | - Fang Li
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA, USA
| | - Fan Yang
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA, USA
| | - Daohai Yu
- Department of Clinical Sciences, Temple University School of Medicine, Philadelphia, PA, USA
| | - Frederick V Ramsey
- Department of Clinical Sciences, Temple University School of Medicine, Philadelphia, PA, USA
| | - George P Tuszyski
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA, USA
| | - Wenhui Hu
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA, USA
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Abstract
Both embryonic and adult neurogenesis involves the self-renewal/proliferation, survival, migration and lineage differentiation of neural stem/progenitor cells. Such dynamic process is tightly regulated by intrinsic and extrinsic factors and complex signaling pathways. Misregulated neurogenesis contributes much to a large range of neurodevelopmental defects and neurodegenerative diseases. The signaling of NFκB regulates many genes important in inflammation, immunity, cell survival and neural plasticity. During neurogenesis, NFκB signaling mediates the effect of numerous niche factors such as cytokines, chemokines, growth factors, extracellular matrix molecules, but also crosstalks with other signaling pathways such as Notch, Shh, Wnt/β-catenin. This review summarizes current progress on the NFκB signaling in all aspects of neurogenesis, focusing on the novel role of NFκB signaling in initiating early neural differentiation of neural stem cells and embryonic stem cells.
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Affiliation(s)
- Yonggang Zhang
- Department of Neuroscience, Temple University School of Medicine, Philadelphia, PA 19140, USA
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Palkowitsch L, Leidner J, Ghosh S, Marienfeld RB. Phosphorylation of Serine 68 in the IκB Kinase (IKK)-binding Domain of NEMO Interferes with the Structure of the IKK Complex and Tumor Necrosis Factor-α-induced NF-κB Activity. J Biol Chem 2008; 283:76-86. [DOI: 10.1074/jbc.m708856200] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Cappello C, Saugel B, Huth KC, Zwergal A, Krautkrämer M, Furman C, Rouis M, Wieser B, Schneider HW, Neumeier D, Brand K. Ozonized low density lipoprotein (ozLDL) inhibits NF-kappaB and IRAK-1-associated signaling. Arterioscler Thromb Vasc Biol 2006; 27:226-32. [PMID: 17053167 DOI: 10.1161/01.atv.0000250615.27795.85] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
OBJECTIVE Recent studies have provided strong evidence for the presence of ozone in atherosclerotic lesions. In addition, modification of LDL has been suggested to be involved in atherosclerosis. In the present study we wanted to investigate whether LDL exposed to ozone (ozLDL) is able to modulate the NF-kappaB system, as a paradigm for inflammatory signaling. METHODS AND RESULTS We showed that activation of NF-kappaB by lipopolysaccharide (LPS), a prototypic inducer of innate immunity, was reversibly inhibited by ozLDL in monocytic THP-1 cells in a dose-dependent manner, whereas tumor necrosis factor (TNF) signaling was not affected. This was not attributable to a direct ozone effect or solely the presence of lipoprotein, and neither required direct contact to LPS nor was accompanied by a change in LPS binding. Comparable inhibitory effects of ozLDL were observed in human monocyte/macrophages and endothelial cells. The presence of ozLDL led to a decrease in LPS-induced IkappaB alpha proteolysis and a reduction of kappaB-dependent transcription/target-gene expression. Furthermore, ozLDL markedly lowered stimulus-induced IkappaB kinase (IKK) activity and phosphorylation/proteolysis of interleukin (IL)-1 receptor-associated kinase-1 (IRAK-1). Finally, cholesterol ozonization products were identified as effective ozLDL inhibitory compounds. CONCLUSIONS Our study demonstrated that ozLDL inhibited NF-kappaB and IRAK-1-associated signaling which may impair immune function and promote apoptosis.
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Affiliation(s)
- Christian Cappello
- Institute of Clinical Chemistry and Pathobiochemistry, Technische Universität München, Klinikum rechts der Isar, Ismaninger Strasse 22, 81675 München, Germany
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Zwergal A, Quirling M, Saugel B, Huth KC, Sydlik C, Poli V, Neumeier D, Ziegler-Heitbrock HWL, Brand K. C/EBPβ Blocks p65 Phosphorylation and Thereby NF-κB-Mediated Transcription in TNF-Tolerant Cells. THE JOURNAL OF IMMUNOLOGY 2006; 177:665-72. [PMID: 16785565 DOI: 10.4049/jimmunol.177.1.665] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
TNF is a major mediator of inflammation, immunity, and apoptosis. Pre-exposure to TNF reduces sensitivity to restimulation, a phenomenon known as tolerance, considered as protective in sepsis, but also as a paradigm for immunoparalysis. Earlier experiments in TNF-tolerant cells display inhibition of NF-kappaB-dependent IL-8 gene expression at the transcriptional level with potential involvement of C/EBPbeta. In this study, we have shown that a kappaB motive was sufficient to mediate transcriptional inhibition under TNF tolerance conditions in monocytic cells. Furthermore, in tolerant cells, TNF-induced NF-kappaB p65 phosphorylation was markedly decreased, which was accompanied by the formation of C/EBPbeta-p65 complexes. Remarkably, in C/EBPbeta(-/-) cells incubated under the conditions of TNF tolerance, neither impairment of transcription nor inhibition of p65 phosphorylation was observed. Finally, we showed that C/EBPbeta overexpression reduced p65-mediated transactivation and that association of C/EBPbeta with p65 specifically prevented p65 phosphorylation. Our data demonstrate that C/EBPbeta is an essential signaling component for inhibition of NF-kappaB-mediated transcription in TNF-tolerant cells and suggest that this is caused by blockade of p65 phosphorylation. These results define a new molecular mechanism responsible for TNF tolerance in monocytic cells that may contribute to the unresponsiveness seen in patients with sepsis.
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Affiliation(s)
- Andreas Zwergal
- Institute of Clinical Chemistry and Pathobiochemistry, Klinikum Rechts der Isar, Technische Universität München, Ismaninger Strasse 22, D-81675 Munich, Germany
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Lakshmikanthan V, Kaddour-Djebbar I, Lewis RW, Kumar MV. SAHA-sensitized prostate cancer cells to TNFalpha-related apoptosis-inducing ligand (TRAIL): mechanisms leading to synergistic apoptosis. Int J Cancer 2006; 119:221-8. [PMID: 16450389 DOI: 10.1002/ijc.21824] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Treatment of cancer cells with histone deacetylase inhibitors (HDACi) such as suberolylanilide hydroxamic acid (SAHA) activates genes that promote apoptosis. To enhance proapoptotic efficiency, SAHA has been used in combination with radiation, kinase inhibitors and cytotoxic drugs. Although several prostate cells respond to TNFalpha-Related Apoptosis-Inducing Ligand (TRAIL), LNCaP are resistant. This model system was utilized to examine the advantages of combined treatment with SAHA and TRAIL. In LNCaP cells, TRAIL induced synergistic apoptosis when combined even with the lowest dose of SAHA. Treatment with caspase inhibitor confirmed that SAHA-induced apoptosis was mediated through caspases. In addition to induction of apoptosis, SAHA and TRAIL decreased the levels of proapoptotic proteins IKKalpha, IKKbeta and IKKgamma, suggesting that SAHA treatment may reduce the activity of NFkappaB. However, assay for NFkappaB luciferase reporter activity showed highly significant increase in SAHA-treated cells, supporting earlier suggestions that HDACi promotes NFkappaB transcriptional activity. Further analyses to determine the mechanisms by which the combination of SAHA and TRAIL led to synergistic apoptosis indicated that the apoptotic response of LNCaP is due to a complex regulation of death receptor pathway and alterations of NFkappaB activity at several regulatory steps.
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Shirley RB, Kaddour-Djebbar I, Patel DM, Lakshmikanthan V, Lewis RW, Kumar MV. Combination of proteasomal inhibitors lactacystin and MG132 induced synergistic apoptosis in prostate cancer cells. Neoplasia 2006; 7:1104-11. [PMID: 16354593 PMCID: PMC1501172 DOI: 10.1593/neo.05520] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2005] [Revised: 09/30/2005] [Accepted: 10/03/2005] [Indexed: 12/16/2022] Open
Abstract
The proteasome inhibitor Velcade (bortezomib/PS-341) has been shown to block the targeted proteolytic degradation of short-lived proteins that are involved in cell maintenance, growth, division, and death, advocating the use of proteasomal inhibitors as therapeutic agents. Although many studies focused on the use of one proteasomal inhibitor for therapy, we hypothesized that the combination of proteasome inhibitors Lactacystin (AG Scientific, Inc., San Diego CA) and MG132 (Biomol International, Plymouth Meeting, PA) may be more effective in inducing apoptosis. Additionally, this regimen would enable the use of sublethal doses of individual drugs, thus reducing adverse effects. Results indicate a significant increase in apoptosis when LNCaP prostate cancer cells were treated with increasing levels of Lactacystin, MG132, or a combination of sublethal doses of these two inhibitors. Furthermore, induction in apoptosis coincided with a significant loss of IKKalpha, IKKbeta, and IKKgamma proteins and NFkappaB activity. In addition to describing effective therapeutic agents, we provide a model system to facilitate the investigation of the mechanism of action of these drugs and their effects on the IKK-NFkappaB axis.
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Affiliation(s)
- Robert B Shirley
- Department of Urology, Medical College of Georgia, Augusta, GA 30912, USA
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Brenner D, Golks A, Kiefer F, Krammer PH, Arnold R. Activation or suppression of NFkappaB by HPK1 determines sensitivity to activation-induced cell death. EMBO J 2005; 24:4279-90. [PMID: 16341093 PMCID: PMC1356335 DOI: 10.1038/sj.emboj.7600894] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2005] [Accepted: 11/09/2005] [Indexed: 12/16/2022] Open
Abstract
Restimulation of the T-cell receptor (TCR) in activated T cells induces CD95 (Fas/Apo-1)-mediated activation-induced cell death (AICD). The TCR-proximal mechanisms leading to AICD are elusive. Here we characterize hematopoietic progenitor kinase 1 (HPK1) as a differentially regulated TCR-proximal signaling protein involved in AICD of primary T cells. We show that HPK1 is a functional component of the endogenous IkappaB kinase (IKK) complex and is crucial for TCR-mediated NFkappaB activation. While full-length HPK1 enhances IKKbeta phosphorylation, siRNA-mediated knockdown of HPK1 blunts TCR-mediated NFkappaB activation and increases cell death. We also demonstrate proteolytic processing of HPK1 into HPK1-C, specifically in AICD-sensitive primary T cells. The cleavage product HPK1-C sequesters the inactive IKK complex and suppresses NFkappaB upon TCR restimulation by binding to IKKalpha and IKKbeta. T cells of HPK1-C transgenic mice are sensitized towards TCR-mediated AICD. Consequently, preventing HPK1-C generation in primary T cells by siRNA-mediated knockdown results in decreased AICD. Thus, these results show a novel mechanism of sensitization of T lymphocytes towards AICD by suppression of NFkappaB, and propose that HPK1 is a life/death switch in T lymphocytes.
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Affiliation(s)
- Dirk Brenner
- Tumor Immunology Program, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Alexander Golks
- Tumor Immunology Program, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | | | - Peter H Krammer
- Tumor Immunology Program, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Rüdiger Arnold
- Tumor Immunology Program, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Tumor Immunology Program, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69112 Heidelberg, Germany. Tel.: +49 6221 423769; Fax: +49 6221 411715; E-mail:
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Ear T, Cloutier A, McDonald PP. Constitutive Nuclear Expression of the IκB Kinase Complex and Its Activation in Human Neutrophils. THE JOURNAL OF IMMUNOLOGY 2005; 175:1834-42. [PMID: 16034126 DOI: 10.4049/jimmunol.175.3.1834] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A singular feature of human neutrophils is that they constitutively express substantial amounts of NF-kappaB/Rel proteins and IkappaB-alpha in the nucleus. In this study, we show that in these cells, IkappaB kinase alpha (IKKalpha), IKKbeta, and IKKgamma also partially localize to the nucleus, whereas IKK-related kinases (IKKepsilon, TANK-binding kinase-1) are strictly cytoplasmic, and the NF-kappaB-inducing kinase is strictly nuclear. Following neutrophil activation, IKKbeta and IKKgamma become transiently phosphorylated in both the cytoplasm and nucleus, whereas IKKalpha transiently vanishes from both compartments in what appears to be an IKKbeta-dependent process. These responses are paralleled by the degradation of IkappaB-alpha, and by the phosphorylation of RelA on serine 536, in both compartments. Although both proteins can be IKK substrates, inhibition of IKK prevented IkappaB-alpha phosphorylation, while that of RelA was mostly unaffected. Finally, we provide evidence that the nuclear IKK isoforms (alpha, beta, gamma) associate with chromatin following neutrophil activation, which suggests a potential role in gene regulation. This is the first study to document IKK activation and the phosphorylation of NF-kappaB/Rel proteins in primary neutrophils. More importantly, our findings unveil a hitherto unsuspected mode of activation for the IKK/IkappaB signaling cascade within the cell nucleus.
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Affiliation(s)
- Thornin Ear
- Pulmonary Division, Faculty of Medicine, Université de Sherbrooke, Sherbrooke, Québec, Canada
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