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Apoptosis signal-regulating kinase 1 activation by Nox1-derived oxidants is required for TNFα receptor endocytosis.
Choi H, Stark RJ, Raja BS, Dikalova A, Lamb FS
(2019) Am J Physiol Heart Circ Physiol 316: H1528-H1537
MeSH Terms: Animals, Aorta, Thoracic, Cells, Cultured, Endocytosis, MAP Kinase Kinase Kinase 5, Mice, Inbred C57BL, Muscle, Smooth, Vascular, Myocytes, Smooth Muscle, NADPH Oxidase 1, Receptors, Tumor Necrosis Factor, Type I, Signal Transduction, Superoxides, Tumor Necrosis Factor-alpha
Show Abstract · Added April 3, 2019
Tumor necrosis factor-α (TNFα) is a proinflammatory cytokine that is closely linked to the development of cardiovascular disease. TNFα activates NADPH oxidase 1 (Nox1) and reactive oxygen species (ROS), including superoxide (O), production extracellularly is required for subsequent signaling in vascular smooth muscle cells (VSMCs). Apoptosis signal-regulating kinase 1 (ASK1) is a mitogen-activated protein kinase kinase kinase that is activated by oxidation of associated thioredoxin. The role of ASK1 in Nox1-mediated signaling by TNFα is poorly defined. We hypothesized that ASK1 is required for TNFα receptor endocytosis and subsequent inflammatory TNFα signaling. We employed a knockdown strategy to explore the role of ASK1 in TNFα signaling in VSMCs. siRNA targeting ASK1 had no effect on TNFα-induced extracellular O production. However, siASK1 inhibited receptor endocytosis as well as phosphorylation of two endocytosis-related proteins, dynamin1 and caveolin1. Intracellular O production was subsequently reduced, as were other inflammatory signaling steps including NF-κB activation, IL-6 production, inducible nitric oxide synthase and VCAM expression, and VSMC proliferation. Prolonged exposure to TNFα (24 h) increased tumor necrosis factor receptor (TNFR) subtype 1 and 2 expression, and these effects were also attenuated by siASK1. ASK1 coimmunoprecipitated with both Nox1 and the leucine rich repeat containing 8A anion channel, two essential components of the TNFR1 signaling complex. Activation of ASK1 by autophosphorylation at Thr845 occurs following thioredoxin dissociation, and this requires the presence of Nox1. Thus, Nox1 is part of the multiprotein ASK1 signaling complex. In response to TNFα, ASK1 is activated by Nox1-derived oxidants, and this plays a critical role in translating these ROS into a physiologic response in VSMCs. Apoptosis signal-regulating kinase 1 (ASK1) drives dynamin1 and caveolin1 phosphorylation and TNFα receptor endocytosis. ASK1 modulates TNFα-induced NF-κB activation, survival, and proliferation. ASK1 and NADPH oxidase 1 (Nox1) physically associate in a multiprotein signaling complex. Nox1 is required for TNFα-induced ASK1 activation.
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13 MeSH Terms
CRISPR-Based Epigenome Editing of Cytokine Receptors for the Promotion of Cell Survival and Tissue Deposition in Inflammatory Environments.
Farhang N, Brunger JM, Stover JD, Thakore PI, Lawrence B, Guilak F, Gersbach CA, Setton LA, Bowles RD
(2017) Tissue Eng Part A 23: 738-749
MeSH Terms: Adipose Tissue, Cell Differentiation, Cell Survival, Chondrogenesis, Clustered Regularly Interspaced Short Palindromic Repeats, DNA, Epigenesis, Genetic, Extracellular Matrix, Gene Editing, Glycosaminoglycans, HEK293 Cells, Humans, Immunomodulation, Inflammation, Lentivirus, NF-kappa B, Receptors, Cytokine, Receptors, Tumor Necrosis Factor, Stem Cells, Tissue Engineering, Transduction, Genetic
Show Abstract · Added March 16, 2021
Musculoskeletal diseases have been associated with inflammatory cytokine action, particularly action by TNF-α and IL-1β. These inflammatory cytokines promote apoptosis and senescence of cells in diseased tissue and extracellular matrix breakdown. Stem cell-based therapies are being considered for the treatment of musculoskeletal diseases, but the presence of these inflammatory cytokines will have similar deleterious action on therapeutic cells delivered to these environments. Methods that prevent inflammatory-induced apoptosis and proinflammatory signaling, in cell and pathway-specific manners are needed. In this study we demonstrate the use of clustered regularly interspaced short palindromic repeats (CRISPR)-based epigenome editing to alter cell response to inflammatory environments by repressing inflammatory cytokine cell receptors, specifically TNFR1 and IL1R1. We targeted CRISPR/Cas9-based repressors to TNFR1 and IL1R1 gene regulatory elements in human adipose-derived stem cells (hADSCs) and investigated the functional outcomes of repression of these genes. Efficient signaling regulation was demonstrated in engineered hADSCs, as activity of the downstream transcription factor NF-κB was significantly reduced or maintained at baseline levels in the presence of TNF-α or IL-1β. Pellet culture of undifferentiated hADSCs demonstrated improved survival in engineered hADSCs treated with TNF-α or IL-1β, while having little effect on their immunomodulatory properties. Furthermore, engineered hADSCs demonstrated improved chondrogenic differentiation capacity in the presence of TNF-α or IL-1β, as shown by superior production of glycosaminglycans in this inflammatory environment. Overall this work demonstrates a novel method for modulating cell response to inflammatory signaling that has applications in engineering cells delivered to inflammatory environments, and as a direct gene therapy to protect endogenous cells exposed to chronic inflammation, as observed in a broad spectrum of degenerative musculoskeletal pathology.
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LRRC8A channels support TNFα-induced superoxide production by Nox1 which is required for receptor endocytosis.
Choi H, Ettinger N, Rohrbough J, Dikalova A, Nguyen HN, Lamb FS
(2016) Free Radic Biol Med 101: 413-423
MeSH Terms: Cell Line, Cyclopentanes, Endocytosis, Gene Expression Regulation, HEK293 Cells, Humans, Indans, JNK Mitogen-Activated Protein Kinases, Membrane Proteins, Myocytes, Smooth Muscle, NADPH Oxidase 1, NF-kappa B, Phosphorylation, Protein Subunits, RNA, Small Interfering, Receptors, Tumor Necrosis Factor, Type I, Signal Transduction, Superoxide Dismutase, Superoxides, Tumor Necrosis Factor-alpha, Vascular Cell Adhesion Molecule-1
Show Abstract · Added March 26, 2019
Leucine Rich Repeat Containing 8A (LRRC8A) is a required component of volume-regulated anion channels (VRACs). In vascular smooth muscle cells, tumor necrosis factor-α (TNFα) activates VRAC via type 1 TNFα receptors (TNFR1), and this requires superoxide (O) production by NADPH oxidase 1 (Nox1). VRAC inhibitors suppress the inflammatory response to TNFα by an unknown mechanism. We hypothesized that LRRC8A directly supports Nox1 activity, providing a link between VRAC current and inflammatory signaling. VRAC inhibition by 4-(2-butyl-6,7-dichlor-2-cyclopentylindan-1-on-5-yl) oxobutyric acid (DCPIB) impaired NF-κB activation by TNFα. LRRC8A siRNA reduced the magnitude of VRAC and inhibited TNFα-induced NF-κB activation, iNOS and VCAM expression, and proliferation of VSMCs. Signaling steps disrupted by both siLRRC8A and DCPIB included; extracellular O production by Nox1, c-Jun N-terminal kinase (JNK) phosphorylation and endocytosis of TNFR1. Extracellular superoxide dismutase, but not catalase, selectively inhibited TNFR1 endocytosis and JNK phosphorylation. Thus, O is the critical extracellular oxidant for TNFR signal transduction. Reducing JNK expression (siJNK) increased extracellular O suggesting that JNK provides important negative feedback regulation to Nox1 at the plasma membrane. LRRC8A co-localized by immunostaining, and co-immunoprecipitated with, both Nox1 and its p22phox subunit. LRRC8A is a component of the Nox1 signaling complex. It is required for extracellular O production, which is in turn essential for TNFR1 endocytosis. These data are the first to provide a molecular mechanism for the potent anti-proliferative and anti-inflammatory effects of VRAC inhibition.
Copyright © 2016 Elsevier Inc. All rights reserved.
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Staphylococcus aureus protein A enhances osteoclastogenesis via TNFR1 and EGFR signaling.
Mendoza Bertelli A, Delpino MV, Lattar S, Giai C, Llana MN, Sanjuan N, Cassat JE, Sordelli D, Gómez MI
(2016) Biochim Biophys Acta 1862: 1975-83
MeSH Terms: Animals, Cell Differentiation, ErbB Receptors, Humans, Mice, Mice, Inbred BALB C, Mice, Knockout, Osteoclasts, Osteomyelitis, RANK Ligand, Receptors, Tumor Necrosis Factor, Type I, Staphylococcal Infections, Staphylococcal Protein A, Staphylococcus aureus, Tumor Necrosis Factor-alpha
Added April 3, 2018
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15 MeSH Terms
Combining an Aurora Kinase Inhibitor and a Death Receptor Ligand/Agonist Antibody Triggers Apoptosis in Melanoma Cells and Prevents Tumor Growth in Preclinical Mouse Models.
Liu Y, Hawkins OE, Vilgelm AE, Pawlikowski JS, Ecsedy JA, Sosman JA, Kelley MC, Richmond A
(2015) Clin Cancer Res 21: 5338-48
MeSH Terms: Animals, Antibodies, Monoclonal, Antineoplastic Agents, Apoptosis, Aurora Kinases, Azepines, Caspases, Cell Line, Tumor, Cellular Senescence, Disease Models, Animal, Drug Evaluation, Preclinical, Female, Humans, Melanoma, Mice, Protein Kinase Inhibitors, Pyrimidines, Receptors, Death Domain, Receptors, TNF-Related Apoptosis-Inducing Ligand, Receptors, Tumor Necrosis Factor, Member 10c, Signal Transduction, TNF-Related Apoptosis-Inducing Ligand, Tumor Suppressor Protein p53, Xenograft Model Antitumor Assays
Show Abstract · Added August 21, 2015
PURPOSE - Preclinical studies show that inhibition of aurora kinases in melanoma tumors induces senescence and reduces tumor growth, but does not cause tumor regression. Additional preclinical models are needed to identify agents that will synergize with aurora kinase inhibitors to induce tumor regression.
EXPERIMENTAL DESIGN - We combined treatment with an aurora kinase A inhibitor, MLN8237, with agents that activate death receptors (Apo2L/TRAIL or death receptor 5 agonists) and monitored the ability of this treatment to induce tumor apoptosis and melanoma tumor regression using human cell lines and patient-derived xenograft (PDX) mouse models.
RESULTS - We found that this combined treatment led to apoptosis and markedly reduced cell viability. Mechanistic analysis showed that the induction of tumor cell senescence in response to the AURKA inhibitor resulted in a decreased display of Apo2L/TRAIL decoy receptors and increased display of one Apo2L/TRAIL receptor (death receptor 5), resulting in enhanced response to death receptor ligand/agonists. When death receptors were activated in senescent tumor cells, both intrinsic and extrinsic apoptotic pathways were induced independent of BRAF, NRAS, or p53 mutation status. Senescent tumor cells exhibited BID-mediated mitochondrial depolarization in response to Apo2L/TRAIL treatment. In addition, senescent tumor cells had a lower apoptotic threshold due to decreased XIAP and survivin expression. Melanoma tumor xenografts of one human cell line and one PDX displayed total blockage of tumor growth when treated with MLN8237 combined with DR5 agonist antibody.
CONCLUSIONS - These findings provide a strong rationale for combining senescence-inducing therapeutics with death receptor agonists for improved cancer treatment.
©2015 American Association for Cancer Research.
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24 MeSH Terms
Tumor Necrosis Factor Receptor 2 Restricts the Pathogenicity of CD8(+) T Cells in Mice With Colitis.
Punit S, Dubé PE, Liu CY, Girish N, Washington MK, Polk DB
(2015) Gastroenterology 149: 993-1005.e2
MeSH Terms: Adoptive Transfer, Animals, CD8-Positive T-Lymphocytes, Cell Proliferation, Colitis, Colon, DNA-Binding Proteins, Disease Models, Animal, Gene Expression Regulation, Immunity, Cellular, Interleukin-10, Lymphocyte Activation, Male, Mice, Inbred C57BL, Mice, Knockout, Receptors, Tumor Necrosis Factor, Type II, Signal Transduction, Time Factors
Show Abstract · Added April 12, 2016
BACKGROUND & AIMS - Tumor necrosis factor receptor 2 (TNFR2, Tnfrsf1b) regulates multiple aspects of immune function, but little is known about its role in the immunopathogenesis of inflammatory bowel disease (IBD). We investigated whether TNFR2 restricts the activity of specific immune cell subtypes to protect against the development of colitis in mice.
METHODS - Tnfr2(-/-) mice were crossed with interleukin (Il) 10(-/-) mice, which spontaneously develop colitis, to generate Il10(-/-)Tnfr2(-/-) mice. Colonic tissues were collected from Il10(-/-)Tnfr2(-/-) mice along with Il10(-/-) mice (controls) and analyzed by flow cytometry and histology. Bone marrow was transplanted into Il10(-/-) and Il10(-/-)Tnfr2(-/-) mice from Il10(-/-) or Il10(-/-)Tnfr2(-/-) donors by intravenous injection. CD8(+) T cells were neutralized in Il10(-/-)Tnfr2(-/-) mice by intraperitoneal injection of anti-CD8 or isotype control antibodies. Colitis was induced in Rag2(-/-) mice by intravenous injections of naïve CD8(+) T cells isolated from C57BL/6 or Tnfr2(-/-) mice.
RESULTS - Il10(-/-)Tnfr2(-/-) mice spontaneously developed more severe colitis compared with Il10(-/-) controls, characterized by selective expansion of colonic CD8(+) T cells. Transplantation of TNFR2-deficient bone marrow resulted in significantly increased incidence and severity of colitis. Transcriptome analyses showed that the expression of genes regulated by TNFR2 were specific to CD8(+) T cells and included genes associated with risk for IBD. Depletion of CD8(+) T cells from Il10(-/-)Tnfr2(-/-) mice prevented colonic inflammation. Adoptive transfer of TNFR2-null naïve CD8(+) T cells compared with CD8(+) T cells from control mice increased the severity of colitis that developed in Rag2(-/-) mice.
CONCLUSIONS - TNFR2 protects mice from colitis by inhibiting the expansion of colonic CD8(+) T cells. TNFR2 regulates expression of genes that regulate CD8(+) T cells and have been associated with susceptibility to IBD. Disruption in TNFR2 signaling might therefore be associated with pathogenesis. Strategies to increase levels or activity of TNFR2 and thereby reduce the activity of CD8(+) T cells might be developed to treat IBD patients with CD8(+) T cell dysfunction.
Copyright © 2015 AGA Institute. Published by Elsevier Inc. All rights reserved.
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18 MeSH Terms
c-Jun N-terminal kinase attenuates TNFα signaling by reducing Nox1-dependent endosomal ROS production in vascular smooth muscle cells.
Choi H, Dikalova A, Stark RJ, Lamb FS
(2015) Free Radic Biol Med 86: 219-27
MeSH Terms: Animals, Cells, Cultured, Endocytosis, Endosomes, JNK Mitogen-Activated Protein Kinases, Mice, Inbred C57BL, Mice, Knockout, Mitogen-Activated Protein Kinases, Muscle, Smooth, Vascular, Myocytes, Smooth Muscle, NADH, NADPH Oxidoreductases, NADPH Oxidase 1, NF-kappa B, Reactive Oxygen Species, Receptors, Tumor Necrosis Factor, Type I, Receptors, Tumor Necrosis Factor, Type II, Signal Transduction, Tumor Necrosis Factor-alpha
Show Abstract · Added July 28, 2015
Tumor necrosis factor-α (TNFα), a proinflammatory cytokine, causes vascular smooth muscle cell (VSMC) proliferation and migration and promotes inflammatory vascular lesions. Nuclear factor-kappa B (NF-κB) activation by TNFα requires endosomal superoxide production by Nox1. In endothelial cells, TNFα stimulates c-Jun N-terminal kinase (JNK), which inhibits NF-κB signaling. The mechanism by which JNK negatively regulates TNFα-induced NF-κB activation has not been defined. We hypothesized that JNK modulates NF-κB activation in VSMC, and does so via a Nox1-dependent mechanism. TNFα-induced NF-κB activation was TNFR1- and endocytosis-dependent. Inhibition of endocytosis with dominant-negative dynamin (DynK44A) potentiated TNFα-induced JNK activation, but decreased ERK activation, while p38 kinase phosphorylation was not altered. DynK44A attenuated intracellular, endosomal superoxide production in wild-type (WT) VSMC, but not in NADPH oxidase 1 (Nox1) knockout (KO) cells. siRNA targeting JNK1 or JNK2 potentiated, while a JNK activator (anisomycin) inhibited, TNFα-induced NF-κB activation in WT, but not in Nox1 KO cells. TNFα-stimulated superoxide generation was enhanced by JNK1 inhibition in WT, but not in Nox1 KO VSMC. These data suggest that JNK suppresses the inflammatory response to TNFα by reducing Nox1-dependent endosomal ROS production. JNK and endosomal superoxide may represent novel targets for pharmacologic modulation of TNFα signaling and vascular inflammation.
Copyright © 2015 Elsevier Inc. All rights reserved.
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DNA methyltransferase 3a and mitogen-activated protein kinase signaling regulate the expression of fibroblast growth factor-inducible 14 (Fn14) during denervation-induced skeletal muscle atrophy.
Tajrishi MM, Shin J, Hetman M, Kumar A
(2014) J Biol Chem 289: 19985-99
MeSH Terms: Animals, Base Sequence, Conserved Sequence, CpG Islands, DNA, DNA (Cytosine-5-)-Methyltransferases, DNA Methylation, Gene Expression, Gene Knockdown Techniques, MAP Kinase Signaling System, Mice, Mice, Inbred C57BL, Models, Biological, Molecular Sequence Data, Muscle Denervation, Muscle, Skeletal, Muscular Atrophy, Promoter Regions, Genetic, RNA, Small Interfering, Receptors, Tumor Necrosis Factor, Sequence Homology, Nucleic Acid, Sp1 Transcription Factor, TWEAK Receptor, Transcription Factor AP-1
Show Abstract · Added October 30, 2014
The TWEAK-fibroblast growth factor-inducible 14 (Fn14) system is a critical regulator of denervation-induced skeletal muscle atrophy. Although the expression of Fn14 is a rate-limiting step in muscle atrophy on denervation, mechanisms regulating gene expression of Fn14 remain unknown. Methylation of CpG sites within promoter region is an important epigenetic mechanism for gene silencing. Our study demonstrates that Fn14 promoter contains a CpG island close to transcription start site. Fn14 promoter also contains multiple consensus DNA sequence for transcription factors activator protein 1 (AP1) and specificity protein 1 (SP1). Denervation diminishes overall genomic DNA methylation and causes hypomethylation at specific CpG sites in Fn14 promoter leading to the increased gene expression of Fn14 in skeletal muscle. Abundance of DNA methyltransferase 3a (Dnmt3a) and its interaction with Fn14 promoter are repressed in denervated skeletal muscle of mice. Overexpression of Dnmt3a inhibits the gene expression of Fn14 and attenuates skeletal muscle atrophy upon denervation. Denervation also causes the activation of ERK1/2, JNK1/2, and ERK5 MAPKs and AP1 and SP1, which stimulate the expression of Fn14 in skeletal muscle. Collectively, our study provides novel evidence that Dnmt3a and MAPK signaling regulate the levels of Fn14 in skeletal muscle on denervation.
© 2014 by The American Society for Biochemistry and Molecular Biology, Inc.
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24 MeSH Terms
The effects of stress at work and at home on inflammation and endothelial dysfunction.
Non AL, Rimm EB, Kawachi I, Rewak MA, Kubzansky LD
(2014) PLoS One 9: e94474
MeSH Terms: Aged, Biomarkers, Endothelium, Vascular, Health Personnel, Humans, Inflammation, Intercellular Adhesion Molecule-1, Interleukin-6, Life Change Events, Male, Middle Aged, Receptors, Tumor Necrosis Factor, Stress, Psychological, Vascular Cell Adhesion Molecule-1, Workload
Show Abstract · Added January 20, 2015
This study examined whether stress at work and at home may be related to dysregulation of inflammation and endothelial function, two important contributors to the development of cardiovascular disease. In order to explore potential biological mechanisms linking stress with cardiovascular health, we investigated cross-sectional associations between stress at work and at home with an inflammation score (n's range from 406-433) and with two endothelial biomarkers (intercellular and vascular adhesion molecules, sICAM-1 and sVCAM-1; n's range from 205-235) in a cohort of healthy US male health professionals. No associations were found between stress at work or at home and inflammation. Men with high or medium levels of stress at work had significantly higher levels of sVCAM-1 (13% increase) and marginally higher levels of sICAM-1 (9% increase), relative to those reporting low stress at work, independent of health behaviors. Men with high levels of stress at home had marginally higher levels of both sVCAM-1 and sICAM-1 than those with low stress at home. While lack of findings related to inflammation are somewhat surprising, if replicated in future studies, these findings may suggest that endothelial dysfunction is an important biological mechanism linking stress at work with cardiovascular health outcomes in men.
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Loss of glutathione peroxidase 7 promotes TNF-α-induced NF-κB activation in Barrett's carcinogenesis.
Peng DF, Hu TL, Soutto M, Belkhiri A, El-Rifai W
(2014) Carcinogenesis 35: 1620-8
MeSH Terms: Adenocarcinoma, Barrett Esophagus, Blotting, Western, Cell Transformation, Neoplastic, Cells, Cultured, Esophageal Neoplasms, Fluorescent Antibody Technique, Humans, NF-kappa B, Peroxidases, RNA, Messenger, RNA, Small Interfering, Reactive Oxygen Species, Real-Time Polymerase Chain Reaction, Receptors, Tumor Necrosis Factor, Type I, Receptors, Tumor Necrosis Factor, Type II, Reverse Transcriptase Polymerase Chain Reaction, Signal Transduction, Tumor Necrosis Factor-alpha
Show Abstract · Added May 29, 2014
Esophageal adenocarcinoma (EAC) is a classic example of inflammation-associated cancer, which develops through GERD (gastroesophageal reflux disease)-Barrett's esophagus (BE)-dysplasia-adenocarcinoma sequence. The incidence of EAC has been rising rapidly in the USA and Western countries during the last few decades. The functions of glutathione peroxidase 7 (GPX7), an antioxidant enzyme frequently silenced during Barrett's tumorigenesis, remain largely uncharacterized. In this study, we investigated the potential role of GPX7 in regulating nuclear factor-kappaB (NF-κB) activity in esophageal cells. Western blot analysis, immunofluorescence and luciferase reporter assay data indicated that reconstitution of GPX7 expression in CP-A (non-dysplastic BE cells) and FLO-1 (EAC cells) abrogated tumor necrosis factor-α (TNF-α)-induced NF-κB transcriptional activity (P < 0.01) and nuclear translocation of NF-κB-p65 (P = 0.01). In addition, we detected a marked reduction in phosphorylation levels of components of NF-κB signaling pathway, p-p65 (S536), p-IκB-α (S32) and p-IKKα/β (S176/180), as well as significant suppression in induction of NF-κB target genes [TNF-α, interleukin (IL)-6, IL-8, IL-1β, CXCL-1 and CXCL-2] following treatment with TNF-α in GPX7-expressing FLO-1 cells as compared with control cells. We validated these effects by knockdown of GPX7 expression in HET1A (normal esophageal squamous cells). We found that GPX7-mediated suppression of NF-κB is independent of reactive oxygen species level and GPX7 antioxidant function. Further mechanistic investigations demonstrated that GPX7 promotes protein degradation of TNF-receptor 1 (TNFR1) and TNF receptor-associated factor 2 (TRAF2), suggesting that GPX7 modulates critical upstream regulators of NF-κB. We concluded that the loss of GPX7 expression is a critical step in promoting the TNF-α-induced activation of proinflammatory NF-κB signaling, a major player in GERD-associated Barrett's carcinogenesis.
© The Author 2014. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.
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