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Kokolakis G, Sabat R, Krüger-Krasagakis S, Eberle J. Ambivalent Effects of Tumor Necrosis Factor Alpha on Apoptosis of Malignant and Normal Human Keratinocytes. Skin Pharmacol Physiol 2021; 34:94-102. [PMID: 33730739 DOI: 10.1159/000513725] [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: 09/06/2020] [Accepted: 12/07/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Tumor necrosis factor alpha (TNFα) is a pro-inflammatory cytokine that may paradoxically induce either apoptosis or cell survival. It mediates its activity through binding of TNF-receptor (TNFR) 1 or 2. TNFR1 is mainly responsible for transmitting apoptotic signals. The activation of apoptotic mechanisms can either be intrinsic (mitochondrial) or extrinsic (death receptors). Death ligands such as TNF-related apoptosis-inducing ligand (TRAIL) specifically induce extrinsic apoptosis, while cytostatic drugs such as 5-fluorouracil (5FU) induce intrinsic apoptosis. OBJECTIVES To investigate the effects of TNFα on apoptosis in malignant and normal human keratinocytes. METHODS Human cutaneous squamous cell carcinoma (SCC) cell line SCC-13 and immortalized human keratinocytes HaCaT as well as primary normal human keratinocytes (PNHK) were stimulated with TNFα and then treated either with TRAIL or 5FU. Cell viability and cell proliferation, DNA fragmentation, apoptosis, and cytotoxicity were determined by WST-1 proliferation assay, ELISA, flow cytometry, and colorimetric analysis of lactate dehydrogenase, respectively. In addition, Western blotting was performed for analysis of caspase-3. RESULTS TNFα affected viability of SCC-13 and HaCaT cells in combination with 5FU or TRAIL. In contrast, TNFα did not influence cell viability of PNHK. It enhanced the apoptotic effects of both extrinsic and intrinsic stimuli in SCC-13 and HaCaT. In clear contrast, TNFα protected PNHK against TRAIL- and 5FU-induced apoptosis. The effects were dose-dependent and TNFα-specific; furthermore, the apoptosis pathway was caspase-dependent. CONCLUSIONS In summary, opposing effects of TNFα in malignant versus normal human keratinocytes were observed with possibly relevant clinical implications, when patients are treated with TNFα inhibitors.
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Affiliation(s)
- Georgios Kokolakis
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany, .,Psoriasis Research and Treatment Centre, Charité - Universitätsmedizin Berlin, Berlin, Germany, .,Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Berlin, Germany,
| | - Robert Sabat
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Psoriasis Research and Treatment Centre, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Sabine Krüger-Krasagakis
- Department of Dermatology and Venereology, School of Medicine, University of Crete, Heraklion, Greece
| | - Jürgen Eberle
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Department of Dermatology, Venereology and Allergology, Skin Cancer Center Charité, Charité - Universitätsmedizin Berlin, Berlin, Germany
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Udommethaporn S, Tencomnao T, McGowan EM, Boonyaratanakornkit V. Assessment of Anti-TNF-α Activities in Keratinocytes Expressing Inducible TNF- α: A Novel Tool for Anti-TNF-α Drug Screening. PLoS One 2016; 11:e0159151. [PMID: 27415000 PMCID: PMC4945017 DOI: 10.1371/journal.pone.0159151] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 06/10/2016] [Indexed: 12/26/2022] Open
Abstract
Tumor necrosis factor alpha (TNF-α) is a pro-inflammatory cytokine important in normal and pathological biological processes. Newly synthesized pro-TNF-α is expressed on the plasma membrane and cleaved to release soluble TNF-α protein: both are biologically active. Secreted TNF-α signals through TNF receptors and the membrane-bound TNF-α acts by cell contact-dependent signaling. Anti-TNF-α antibodies have been used effectively for treatment of chronic inflammation, however with adverse side effects. Thus, there is a need for new anti-TNF-α small molecule compounds. Anti-TNF-α activity assays involve treatment of keratinocytes with exogenous TNF-α before or after anti-TNF-α incubation. However, this model fails to address the dual signaling of TNF-α. Here we describe a Doxycycline (Dox)-inducible TNF-α (HaCaT-TNF-α) expression system in keratinocytes. Using this in-vitro model, we show cell inhibition and induced expression of pro-inflammatory cytokines and markers, including IL-1β, IL-6, IL-8, NF-κB1, and KRT-16, similar to cells treated with exogenous TNF-α. Sufficient secreted TNF-α produced also activated IL-1β and IL-8 expression in wt HaCaT cells. Importantly, stimulated expression of IL-1β and IL-8 in HaCaT-TNF-α were blocked by Quercetin, a flavanol shown to possess anti-TNF-α activities. This novel in vitro cell model provides an efficient tool to investigate the dual signaling of TNF-α. Importantly, this model provides an effective, fast, and simple screening for compounds with anti-TNF-α activities for chronic inflammatory disease therapies.
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Affiliation(s)
- Sutthirat Udommethaporn
- Graduate Program in Clinical Biochemistry and Molecular Medicine, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Tewin Tencomnao
- Graduate Program in Clinical Biochemistry and Molecular Medicine, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand.,Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Eileen M McGowan
- Chronic Disease Solutions Team, School of Life Sciences, University of Technology Sydney, Ultimo, 2007, Sydney, Australia
| | - Viroj Boonyaratanakornkit
- Graduate Program in Clinical Biochemistry and Molecular Medicine, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand.,Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
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Role of Ceramide from Glycosphingolipids and Its Metabolites in Immunological and Inflammatory Responses in Humans. Mediators Inflamm 2015; 2015:120748. [PMID: 26609196 PMCID: PMC4644562 DOI: 10.1155/2015/120748] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 10/12/2015] [Accepted: 10/15/2015] [Indexed: 01/19/2023] Open
Abstract
Glycosphingolipids (GSLs) are composed of hydrophobic ceramide and hydrophilic sugar chains. GSLs cluster to form membrane microdomains (lipid rafts) on plasma membranes, along with several kinds of transducer molecules, including Src family kinases and small G proteins. However, GSL-mediated biological functions remain unclear. Lactosylceramide (LacCer, CDw17) is highly expressed on the plasma membranes of human phagocytes and mediates several immunological and inflammatory reactions, including phagocytosis, chemotaxis, and superoxide generation. LacCer forms membrane microdomains with the Src family tyrosine kinase Lyn and the Gαi subunit of heterotrimeric G proteins. The very long fatty acids C24:0 and C24:1 are the main ceramide components of LacCer in neutrophil plasma membranes and are directly connected with the fatty acids of Lyn and Gαi. These observations suggest that the very long fatty acid chains of ceramide are critical for GSL-mediated outside-in signaling. Sphingosine is another component of ceramide, with the hydrolysis of ceramide by ceramidase producing sphingosine and fatty acids. Sphingosine is phosphorylated by sphingosine kinase to sphingosine-1-phosphate, which is involved in a wide range of cellular functions, including growth, differentiation, survival, chemotaxis, angiogenesis, and embryogenesis, in various types of cells. This review describes the role of ceramide moiety of GSLs and its metabolites in immunological and inflammatory reactions in human.
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Said A, Bock S, Müller G, Weindl G. Inflammatory conditions distinctively alter immunological functions of Langerhans-like cells and dendritic cells in vitro. Immunology 2015; 144:218-30. [PMID: 25059418 PMCID: PMC4298416 DOI: 10.1111/imm.12363] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 07/16/2014] [Accepted: 07/18/2014] [Indexed: 12/26/2022] Open
Abstract
The specific function of human skin-resident dendritic cell (DC) subsets in the regulation of immunity or tolerance is still a matter of debate. Langerhans cells (LC) induce anti-viral immune responses but, conversely to dermal DC, maintain tolerance to bacteria. However, the definite function of epidermal LC and cutaneous DC appears even more complex under inflammatory conditions. Here we investigated the immune responses of human immature monocyte-derived DC (MoDC) and LC-like cells (MoLC) upon stimulation with different Toll-like receptor ligands in the presence or absence of pro-inflammatory cytokines tumour necrosis factor-α (TNF-α) and interleukin-1β (IL-1β). In MoDC, bacterial antigens selectively up-regulated CD83 and CD86 expression and induced the release of T helper type 1 (Th1) and Th17 cytokines and led to a higher CCR7-dependent migratory capacity compared with a low responsiveness of MoLC. Importantly, MoLC activation with lipopolysaccharide under inflammatory conditions strongly enhanced a phenotypically mature state, increased IL-12p70, IL-23 and IL-6 production and Th1 cytokine secretion by CD4(+) T cells. Treatment with poly(I:C) specifically up-regulated surface expression of co-stimulatory molecules and increased release of IL-12p70 in MoLC and co-stimulation with TNF-α and IL-1β further elevated Th1 and Th17 cytokine production. Poly(I:C)-induced up-regulation of type I interferon mRNA levels in MoLC and MoDC was Toll-like receptor 3-dependent but not, or only weakly, modulated by pro-inflammatory cytokines. Our results indicate that inflammatory conditions greatly facilitate recognition of bacteria by MoLC. Furthermore, we suggest a critical involvement of both subsets in innate defence against viruses, whereas inflammatory skin environments additionally favour MoLC as potent inducers of Th1 and Th17 cytokines.
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Affiliation(s)
- André Said
- Institute of Pharmacy (Pharmacology and Toxicology), Freie Universität BerlinBerlin, Germany
| | - Stephanie Bock
- Institute of Pharmacy (Pharmacology and Toxicology), Freie Universität BerlinBerlin, Germany
| | - Gerrit Müller
- Institute of Pharmacy (Pharmacology and Toxicology), Freie Universität BerlinBerlin, Germany
| | - Günther Weindl
- Institute of Pharmacy (Pharmacology and Toxicology), Freie Universität BerlinBerlin, Germany
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GAO MINGXIN, XIE BAODONG, GU CHENGXIONG, LI HAITAO, ZHANG FAN, YU YANG. Targeting the proinflammatory cytokine tumor necrosis factor-α to alleviate cardiopulmonary bypass-induced lung injury (Review). Mol Med Rep 2014; 11:2373-8. [DOI: 10.3892/mmr.2014.3050] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 11/12/2014] [Indexed: 11/05/2022] Open
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Lynde CW, Poulin Y, Vender R, Bourcier M, Khalil S. Interleukin 17A: toward a new understanding of psoriasis pathogenesis. J Am Acad Dermatol 2014; 71:141-50. [PMID: 24655820 DOI: 10.1016/j.jaad.2013.12.036] [Citation(s) in RCA: 221] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 12/18/2013] [Accepted: 12/20/2013] [Indexed: 12/14/2022]
Abstract
Molecular and cellular understanding of psoriasis pathogenesis has evolved considerably over the last 30 years beginning in the early 1980s when psoriasis was thought to be a skin disease driven by keratinocyte hyperproliferation. During the next 20 years, the role of the immune system and T-helper (Th) cells in psoriasis pathogenesis was recognized. The presence of the interleukin (IL)-12 cytokine in psoriatic lesions led to the postulate that psoriasis is mediated by Th1 cells. Recent evidence has revealed a role for Th17 cells, and other immune cells, as proximal regulators of psoriatic skin inflammation. IL-17A, the principal effector cytokine of Th17 cells, stimulates keratinocytes to produce chemokines, cytokines, and other proinflammatory mediators thereby enabling IL-17A to bridge the innate and adaptive immune systems to sustain chronic inflammation. This model underlies the rationale for inhibiting IL-17A signaling as a potential therapeutic approach to disrupt the psoriatic inflammatory loop. Several monoclonal antibodies that inhibit the IL-17 pathway are in clinical development. These agents exhibit promising clinical efficacy and tolerability profiles including immunohistochemical improvement in psoriatic plaques. Results from clinical trials with IL-17 pathway inhibitors are refining our understanding of psoriasis pathogenesis and may provide a new therapeutic approach for patients with moderate to severe psoriasis.
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Affiliation(s)
| | - Yves Poulin
- Centre de Recherche Dermatologique du Quebec Metropolitain, Quebec City, Quebec, Canada
| | | | | | - Sam Khalil
- Novartis Pharmaceuticals, Montreal, Quebec, Canada
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Oizumi A, Nakayama H, Okino N, Iwahara C, Kina K, Matsumoto R, Ogawa H, Takamori K, Ito M, Suga Y, Iwabuchi K. Pseudomonas-derived ceramidase induces production of inflammatory mediators from human keratinocytes via sphingosine-1-phosphate. PLoS One 2014; 9:e89402. [PMID: 24586752 PMCID: PMC3934885 DOI: 10.1371/journal.pone.0089402] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 01/21/2014] [Indexed: 01/01/2023] Open
Abstract
Ceramide is important for water retention and permeability barrier functions in the stratum corneum, and plays a key role in the pathogenesis of atopic dermatitis (AD). A Pseudomonas aeruginosa-derived neutral ceramidase (PaCDase) isolated from a patient with AD was shown to effectively degrade ceramide in the presence of Staphylococcus aureus-derived lipids or neutral detergents. However, the effect of ceramide metabolites on the functions of differentiating keratinocytes is poorly understood. We found that the ceramide metabolite sphingosine-1-phosphate (S1P) stimulated the production of inflammatory mediators such as TNF-α and IL-8 from three-dimensionally cultured human primary keratinocytes (termed "3D keratinocytes"), which form a stratum corneum. PaCDase alone did not affect TNF-α gene expression in 3D keratinocytes. In the presence of the detergent Triton X-100, which damages stratum corneum structure, PaCDase, but not heat-inactivated PaCDase or PaCDase-inactive mutant, induced the production of TNF-α, endothelin-1, and IL-8, indicating that this production was dependent on ceramidase activity. Among various ceramide metabolites, sphingosine and S1P enhanced the gene expression of TNF-α, endothelin-1, and IL-8. The PaCDase-enhanced expression of these genes was inhibited by a sphingosine kinase inhibitor and by an S1P receptor antagonist VPC 23019. The TNF-α-binding antibody infliximab suppressed the PaCDase-induced upregulation of IL-8, but not TNF-α, mRNA. PaCDase induced NF-κB p65 phosphorylation. The NF-κB inhibitor curcumin significantly inhibited PaCDase-induced expression of IL-8 and endothelin-1. VPC 23019 and infliximab inhibited PaCDase-induced NF-κB p65 phosphorylation and reduction in the protein level of the NF-κB inhibitor IκBα. Collectively, these findings suggest that (i) 3D keratinocytes produce S1P from sphingosine, which is produced through the hydrolysis of ceramide by PaCDase, (ii) S1P induces the production of TNF-α via S1P receptors, and (iii) released TNF-α stimulates the production of inflammatory mediators such as IL-8.
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Affiliation(s)
- Ami Oizumi
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan ; Department of Dermatology, Juntendo University Urayasu Hospital, Urayasu, Japan
| | - Hitoshi Nakayama
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan ; Laboratory of Biochemistry, Juntendo University School of Health Care and Nursing, Urayasu, Japan
| | - Nozomu Okino
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Chihiro Iwahara
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan
| | - Katsunari Kina
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan
| | - Ryo Matsumoto
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan
| | - Hideoki Ogawa
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan
| | - Kenji Takamori
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan ; Department of Dermatology, Juntendo University Urayasu Hospital, Urayasu, Japan
| | - Makoto Ito
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
| | - Yasushi Suga
- Department of Dermatology, Juntendo University Urayasu Hospital, Urayasu, Japan
| | - Kazuhisa Iwabuchi
- Institute for Environmental and Gender-specific Medicine, Juntendo University Graduate School of Medicine, Urayasu, Japan ; Laboratory of Biochemistry, Juntendo University School of Health Care and Nursing, Urayasu, Japan
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Pulmonary artery perfusion with anti-tumor necrosis factor alpha antibody reduces cardiopulmonary bypass-induced inflammatory lung injury in a rabbit model. PLoS One 2013; 8:e83236. [PMID: 24386164 PMCID: PMC3873915 DOI: 10.1371/journal.pone.0083236] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 10/31/2013] [Indexed: 11/19/2022] Open
Abstract
Inflammatory lung injury is one of the main complications associated with cardiopulmonary bypass (CPB). Tumor necrosis factor-α (TNF-α) is one of the key factors mediating the CPB-induced inflammatory reactions. Our previous studies have shown that endotracheal administration of anti-tumor necrosis factor-α antibody (TNF-α Ab) produces some beneficial effects on lung in a rabbit CPB model. In this study, we further examined the effects of pulmonary artery perfusion with TNF-α Ab (27 ng/kg) on lung tissue integrity and pulmonary inflammation during CPB and investigated the mechanism underlying the TNF-α Ab-mediated effects in a rabbit model of CPB. Our results from transmission electron microscopy showed that the perfusion with TNF-α Ab alleviated CPB-induced histopathological changes in lung tissue. The perfusion with TNF-α Ab also prevented CPB-induced pulmonary edema and improved oxygenation index. Parameters indicating pulmonary inflammation, including neutrophil count and plasma TNF-α and malondialdehyde (MDA) levels, were significantly reduced during CPB by pulmonary artery perfusion with TNF-α Ab, suggesting that the perfusion with TNF-α Ab reduces CPB-induced pulmonary inflammation. We further investigated the molecular mechanism underlying the protective effects of TNF-α Ab on lung. Our quantitative RT-PCR analysis revealed that pulmonary artery perfusion with TNF-α Ab significantly decreased TNF-α expression in lung tissue during CPB. The apoptotic index in lung tissue and the expression of proteins that play stimulatory roles in apoptosis pathways including the fas ligand (FasL) and Bax were markedly reduced during CPB by the perfusion with TNF-α Ab. In contrast, the expression of Bcl-2, which plays an inhibitory role in apoptosis pathways, was significantly increased during CPB by the perfusion with TNF-α Ab, indicating that the perfusion with TNF-α Ab significantly reduces CPB-induced apoptosis in lung. Thus, our study suggests that pulmonary artery perfusion with TNF-α Ab might be a promising approach for attenuating CPB-induced inflammatory lung injury.
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Pękalski J, Zuk PJ, Kochańczyk M, Junkin M, Kellogg R, Tay S, Lipniacki T. Spontaneous NF-κB activation by autocrine TNFα signaling: a computational analysis. PLoS One 2013; 8:e78887. [PMID: 24324544 PMCID: PMC3855823 DOI: 10.1371/journal.pone.0078887] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Accepted: 09/16/2013] [Indexed: 11/18/2022] Open
Abstract
NF-κB is a key transcription factor that regulates innate immune response. Its activity is tightly controlled by numerous feedback loops, including two negative loops mediated by NF-κB inducible inhibitors, IκBα and A20, which assure oscillatory responses, and by positive feedback loops arising due to the paracrine and autocrine regulation via TNFα, IL-1 and other cytokines. We study the NF-κB system of interlinked negative and positive feedback loops, combining bifurcation analysis of the deterministic approximation with stochastic numerical modeling. Positive feedback assures the existence of limit cycle oscillations in unstimulated wild-type cells and introduces bistability in A20-deficient cells. We demonstrated that cells of significant autocrine potential, i.e., cells characterized by high secretion of TNFα and its receptor TNFR1, may exhibit sustained cytoplasmic-nuclear NF-κB oscillations which start spontaneously due to stochastic fluctuations. In A20-deficient cells even a small TNFα expression rate qualitatively influences system kinetics, leading to long-lasting NF-κB activation in response to a short-pulsed TNFα stimulation. As a consequence, cells with impaired A20 expression or increased TNFα secretion rate are expected to have elevated NF-κB activity even in the absence of stimulation. This may lead to chronic inflammation and promote cancer due to the persistent activation of antiapoptotic genes induced by NF-κB. There is growing evidence that A20 mutations correlate with several types of lymphomas and elevated TNFα secretion is characteristic of many cancers. Interestingly, A20 loss or dysfunction also leaves the organism vulnerable to septic shock and massive apoptosis triggered by the uncontrolled TNFα secretion, which at high levels overcomes the antiapoptotic action of NF-κB. It is thus tempting to speculate that some cancers of deregulated NF-κB signaling may be prone to the pathogen-induced apoptosis.
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Affiliation(s)
- Jakub Pękalski
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland
- Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland
| | - Pawel J. Zuk
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland
- Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - Marek Kochańczyk
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland
| | - Michael Junkin
- Department of Biosystems Science and Engineering, ETH Zurich, Zurich, Switzerland
| | - Ryan Kellogg
- Department of Biosystems Science and Engineering, ETH Zurich, Zurich, Switzerland
| | - Savaş Tay
- Department of Biosystems Science and Engineering, ETH Zurich, Zurich, Switzerland
| | - Tomasz Lipniacki
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland
- Department of Statistics, Rice University, Houston, Texas, United States of America
- * E-mail:
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Hernandez-Alejandro R, Zhang X, Croome KP, Zheng X, Parfitt J, Chen D, Jevnikar A, Wall W, Min WP, Quan D. Reduction of Liver Ischemia Reperfusion Injury by Silencing of TNF-α Gene with shRNA. J Surg Res 2012; 176:614-20. [DOI: 10.1016/j.jss.2011.10.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2011] [Revised: 09/23/2011] [Accepted: 10/06/2011] [Indexed: 10/15/2022]
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Williams O, Houseman BT, Kunkel EJ, Aizenstein B, Hoffman R, Knight ZA, Shokat KM. Discovery of dual inhibitors of the immune cell PI3Ks p110delta and p110gamma: a prototype for new anti-inflammatory drugs. CHEMISTRY & BIOLOGY 2010; 17:123-34. [PMID: 20189103 PMCID: PMC2858875 DOI: 10.1016/j.chembiol.2010.01.010] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2009] [Revised: 12/19/2009] [Accepted: 01/04/2010] [Indexed: 01/10/2023]
Abstract
PI3Kdelta and PI3Kgamma regulate immune cell signaling, while the related PI3Kalpha and PI3Kbeta regulate cell survival and metabolism. Selective inhibitors of PI3Kdelta/gamma represent a potential class of anti-inflammatory agents lacking the antiproliferative effects associated with PI3Kalpha/beta inhibition. Here we report the discovery of PI3Kdelta/gamma inhibitors that display up to 1000-fold selectivity over PI3Kalpha/beta and evaluate these compounds in a high-content inflammation assay using mixtures of primary human cells. We find selective inhibition of only PI3Kdelta is weakly anti-inflammatory, but PI3Kdelta/gamma inhibitors show superior inflammatory marker suppression through suppression of lipopolysaccharide-induced TNFalpha production and T cell activation. Moreover, PI3Kdelta/gamma inhibition yields an anti-inflammatory signature distinct from pan-PI3K inhibition and known anti-inflammatory drugs, yet bears striking similarities to glucocorticoid receptor agonists. These results highlight the potential of selectively designing drugs that target kinases with shared biological function.
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Affiliation(s)
- Olusegun Williams
- Graduate Program in Chemistry and Chemical Biology, University of California, San Francisco, 600 16th Street, San Francisco, California 94158, USA
| | - Benjamin T. Houseman
- Howard Hughes Medical Institute and Department of Cellular and Molecular Pharmacology, University of California, San Francisco, 600 16 St., San Francisco, CA 94158
| | - Eric J. Kunkel
- BioSeek, Inc., 310 Utah Ave., Suite 100, South San Francisco, CA 94080
| | - Brian Aizenstein
- Invitrogen Corporation, 501 Charmany Drive, Madison, Wisconsin 53719, USA
| | - Randy Hoffman
- Invitrogen Corporation, 501 Charmany Drive, Madison, Wisconsin 53719, USA
| | - Zachary A. Knight
- Howard Hughes Medical Institute and Department of Cellular and Molecular Pharmacology, University of California, San Francisco, 600 16 St., San Francisco, CA 94158
| | - Kevan M. Shokat
- Howard Hughes Medical Institute and Department of Cellular and Molecular Pharmacology, University of California, San Francisco, 600 16 St., San Francisco, CA 94158
- Department of Chemistry, University of California, Berkeley, Berkeley, California, USA
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Garcin G, Le Gallic L, Stoebner PE, Guezennec A, Guesnet J, Lavabre-Bertrand T, Martinez J, Meunier L. Constitutive Expression of MC1R in HaCaT Keratinocytes Inhibits Basal and UVB-induced TNF-α Production. Photochem Photobiol 2009; 85:1440-50. [DOI: 10.1111/j.1751-1097.2009.00598.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Faurschou A, Gniadecki R. TNF-α stimulates Akt by a distinct aPKC-dependent pathway in premalignant keratinocytes. Exp Dermatol 2008; 17:992-7. [DOI: 10.1111/j.1600-0625.2008.00740.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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UVB and proinflammatory cytokines synergistically activate TNF-alpha production in keratinocytes through enhanced gene transcription. J Invest Dermatol 2008; 129:994-1001. [PMID: 19005488 DOI: 10.1038/jid.2008.332] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
UVB irradiation potently induces cytokines in the skin, including IL-1alpha and tumor necrosis factor-alpha (TNF-alpha). The mechanism for TNF-alpha induction in UVB-irradiated keratinocytes is not clear. In this study, we explored the effects of UVB and cytokines, alone or in combination in human keratinocytes. Keratinocytes were sham- or UVB-irradiated with 30 mJ cm(-2), and then incubated in the absence or presence of IFN-alpha2b, TNF-alpha, or IL-1alpha. UVB and IL-1alpha treatment synergistically enhanced TNF-alpha secretion and mRNA levels in human keratinocytes, similar to the findings reported previously in human fibroblasts. Exogenous recombinant TNF-alpha up-regulates its own mRNA level. However, addition of IFN-alpha2b did not show any additive effect on TNF-alpha mRNA induction. To understand the regulation of TNF-alpha mRNA by UVB, with or without IL-1alpha, we examined the transcription rate and half-life of TNF-alpha mRNA. Treatment of keratinocytes with IL-1alpha or UVB alone increased TNF-alpha gene transcription 4- to 5-fold over sham treatment, and TNF-alpha gene transcription increased 11-fold in cells treated with UVB plus IL-1alpha over sham. UVB with IL-1alpha did not enhance the half-life of TNF-alpha mRNA over that seen with UVB alone. In conclusion, TNF-alpha expression in primary keratinocytes is upregulated transcriptionally by UVB and IL-1alpha.
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Regulatory mechanism of TNFα autoregulation in HaCaT cells: The role of the transcription factor EGR-1. Biochem Biophys Res Commun 2008; 374:777-82. [DOI: 10.1016/j.bbrc.2008.07.117] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Accepted: 07/23/2008] [Indexed: 11/22/2022]
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Faurschou A, Gniadecki R, Wulf HC. Infliximab inhibits DNA repair in ultraviolet B-irradiated premalignant keratinocytes. Exp Dermatol 2008; 17:933-8. [PMID: 18557931 DOI: 10.1111/j.1600-0625.2008.00727.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Anti-tumor necrosis factor-alpha (TNFalpha) approaches are increasingly used in the therapy of autoimmune diseases. One of the safety concerns is the potential enhancement of skin carcinogenesis. The aim of this study was to investigate if the TNFalpha neutralizing antibody, infliximab, directly affects the cell cycle and DNA repair in premalignant human keratinocytes after ultraviolet-B (UVB) irradiation. We found that infliximab-treated cells exhibited an enhanced G2/M cell cycle arrest and increased apoptosis after 10-20 mJ/cm(2) UVB. In spite of this, the level of cyclobutane pyrimidine dimers (CPD) in infliximab-treated cells was significantly increased at both 24 and 48 h after irradiation with 10 mJ/cm(2) UVB. As we have recently shown that protein kinase B/Akt is involved in the TNFalpha signalling pathway and promotes cell survival and skin carcinogenesis, we measured activatory phosphorylations of Akt (Ser-473 and Thr-308) and the signalling via related pathways Erk 1/2, p38 and p70-S6K. Infliximab inhibited Akt and its downstream targets p70-S6K and Erk 1/2, and stimulated p38 both in sham-irradiated and UVB-irradiated cells. In conclusion, despite the fact that infliximab blocks Akt and stimulates the G2/M checkpoint and apoptosis in UVB-irradiated keratinocytes, the repair of CPD is impaired. It is conceivable that anti-TNFalpha treatments may contribute to the accumulation of mutagenic lesions in the epidermis and enhance the early stages of skin carcinogenesis.
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Affiliation(s)
- Annesofie Faurschou
- Department of Dermatology, University of Copenhagen, Bispebjerg Hospital, Copenhagen, Denmark.
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