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Al-Lamki RS, Tolkovsky AM, Alawwami M, Lu W, Field SF, Wang J, Pober JS, Bradley JR. Tumor Necrosis Factor Receptor-2 Signals Clear-Cell Renal Carcinoma Proliferation via Phosphorylated 4E Binding Protein-1 and Mitochondrial Gene Translation. THE AMERICAN JOURNAL OF PATHOLOGY 2024; 194:1374-1387. [PMID: 38537932 DOI: 10.1016/j.ajpath.2024.02.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 02/08/2024] [Accepted: 02/21/2024] [Indexed: 04/09/2024]
Abstract
Clear-cell renal cell carcinoma (ccRCC), a tubular epithelial malignancy, secretes tumor necrosis factor (TNF), which signals ccRCC cells in an autocrine manner via two cell surface receptors, TNFR1 and TNFR2, to activate shared and distinct signaling pathways. Selective ligation of TNFR2 drives cell cycle entry of malignant cells via a signaling pathway involving epithelial tyrosine kinase, vascular endothelial cell growth factor receptor type 2, phosphatidylinositol-3-kinase, Akt, pSer727-Stat3, and mammalian target of rapamycin. In this study, phosphorylated 4E binding protein-1 (4EBP1) serine 65 (pSer65-4EBP1) was identified as a downstream target of this TNFR2 signaling pathway. pSer65-4EBP1 expression was significantly elevated relative to total 4EBP1 in ccRCC tissue compared with that in normal kidneys, with signal intensity increasing with malignant grade. Selective ligation of TNFR2 with the TNFR2-specific mutein increased pSer65-4EBP1 expression in organ cultures that co-localized with internalized TNFR2 in mitochondria and increased expression of mitochondrially encoded COX (cytochrome c oxidase subunit) Cox1, as well as nuclear-encoded Cox4/5b subunits. Pharmacologic inhibition of mammalian target of rapamycin reduced both TNFR2-specific mutein-mediated phosphorylation of 4EBP1 and cell cycle activation in tumor cells while increasing cell death. These results signify the importance of pSer65-4EBP1 in mediating TNFR2-driven cell-cycle entry in tumor cells in ccRCC and implicate a novel relationship between the TNFR2/pSer65-4EBP1/COX axis and mitochondrial function.
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MESH Headings
- Humans
- Adaptor Proteins, Signal Transducing/metabolism
- Adaptor Proteins, Signal Transducing/genetics
- Carcinoma, Renal Cell/metabolism
- Carcinoma, Renal Cell/pathology
- Carcinoma, Renal Cell/genetics
- Cell Cycle Proteins/metabolism
- Cell Cycle Proteins/genetics
- Cell Line, Tumor
- Cell Proliferation
- Kidney Neoplasms/metabolism
- Kidney Neoplasms/pathology
- Kidney Neoplasms/genetics
- Mitochondria/metabolism
- Phosphoproteins/metabolism
- Phosphorylation
- Protein Biosynthesis
- Receptors, Tumor Necrosis Factor, Type II/metabolism
- Receptors, Tumor Necrosis Factor, Type II/genetics
- Signal Transduction
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Affiliation(s)
- Rafia S Al-Lamki
- Department of Medicine, National Institute of Health Research Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, United Kingdom.
| | - Aviva M Tolkovsky
- Department of Clinical Neurosciences, The Clifford Allbutt Building, University of Cambridge, Cambridge, United Kingdom
| | - Mohammad Alawwami
- Department of Medicine, National Institute of Health Research Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, United Kingdom
| | - WanHua Lu
- Department of Medicine, National Institute of Health Research Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, United Kingdom
| | - Sarah F Field
- Dementia Research Institute, Island Research Building, University of Cambridge, Cambridge, United Kingdom
| | - Jun Wang
- Department of Medicine, National Institute of Health Research Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, United Kingdom
| | - Jordan S Pober
- Department of Immunobiology, Yale University, New Haven, Connecticut
| | - John R Bradley
- Department of Medicine, National Institute of Health Research Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, United Kingdom
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2
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Wang Q, Han J, Liang Z, Geng X, Du Y, Zhou J, Yao W, Xu T. FSH Is Responsible for Androgen Deprivation Therapy-Associated Atherosclerosis in Mice by Exaggerating Endothelial Inflammation and Monocyte Adhesion. Arterioscler Thromb Vasc Biol 2024; 44:698-719. [PMID: 38205641 PMCID: PMC10880942 DOI: 10.1161/atvbaha.123.319426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 12/21/2023] [Indexed: 01/12/2024]
Abstract
BACKGROUND Androgen deprivation therapy (ADT) is the mainstay treatment for advanced prostate cancer. But ADTs with orchiectomy and gonadotropin-releasing hormone (GnRH) agonist are associated with increased risk of cardiovascular diseases, which appears less significant with GnRH antagonist. The difference of follicle-stimulating hormone (FSH) in ADT modalities is hypothesized to be responsible for ADT-associated cardiovascular diseases. METHODS We administered orchiectomy, GnRH agonist, or GnRH antagonist in male ApoE-/- mice fed with Western diet and manipulated FSH levels by testosterone and FSH supplementation or FSH antibody to investigate the role of FSH elevation on atherosclerosis. By combining lipidomics, in vitro study, and intraluminal FSHR (FSH receptor) inhibition, we delineated the effects of FSH on endothelium and monocytes and the underlying mechanisms. RESULTS Orchiectomy and GnRH agonist, but not GnRH antagonist, induced long- or short-term FSH elevation and significantly accelerated atherogenesis. In orchiectomized and testosterone-supplemented mice, FSH exposure increased atherosclerosis. In GnRH agonist-treated mice, blocking of short FSH surge by anti-FSHβ antibody greatly alleviated endothelial inflammation and delayed atherogenesis. In GnRH antagonist-treated mice, FSH supplementation aggravated atherogenesis. Mechanistically, FSH, synergizing with TNF-α (tumor necrosis factor alpha), exacerbated endothelial inflammation by elevating VCAM-1 (vascular cell adhesion protein 1) expression through the cAMP/PKA (protein kinase A)/CREB (cAMP response element-binding protein)/c-Jun and PI3K (phosphatidylinositol 3 kinase)/AKT (protein kinase B)/GSK-3β (glycogen synthase kinase 3 beta)/GATA-6 (GATA-binding protein 6) pathways. In monocytes, FSH upregulated CD29 (cluster of differentiation 29) expression via the PI3K/AKT/GSK-3β/SP1 (specificity protein 1) pathway and promoted monocyte-endothelial adhesion both in vitro and in vivo. Importantly, FSHR knockdown by shRNA in endothelium of carotid arteries markedly reduced GnRH agonist-induced endothelial inflammation and atherosclerosis in mice. CONCLUSIONS FSH is responsible for ADT-associated atherosclerosis by exaggerating endothelial inflammation and promoting monocyte-endothelial adhesion.
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Affiliation(s)
- Qiang Wang
- Department of Urology, Peking University People’s Hospital, Beijing, China (Q.W., J.H., Y.D., T.X.)
- Department of Urology, Sichuan Cancer Hospital, Sichuan Cancer Center, School of Medicine, University of Electronic Science and Technology of China, Chengdu (Q.W.)
| | - Jingli Han
- Department of Urology, Peking University People’s Hospital, Beijing, China (Q.W., J.H., Y.D., T.X.)
| | - Zhenhui Liang
- Department of Physiology and Pathophysiology, Hemorheology Center, School of Basic Medical Sciences, Peking University, Beijing, China (Z.L., X.G., J.Z., W.Y.)
- Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing, China (Z.L., X.G., J.Z., W.Y.)
| | - Xueyu Geng
- Department of Physiology and Pathophysiology, Hemorheology Center, School of Basic Medical Sciences, Peking University, Beijing, China (Z.L., X.G., J.Z., W.Y.)
- Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing, China (Z.L., X.G., J.Z., W.Y.)
| | - Yiqing Du
- Department of Urology, Peking University People’s Hospital, Beijing, China (Q.W., J.H., Y.D., T.X.)
| | - Jing Zhou
- Department of Physiology and Pathophysiology, Hemorheology Center, School of Basic Medical Sciences, Peking University, Beijing, China (Z.L., X.G., J.Z., W.Y.)
- Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing, China (Z.L., X.G., J.Z., W.Y.)
| | - Weijuan Yao
- Department of Physiology and Pathophysiology, Hemorheology Center, School of Basic Medical Sciences, Peking University, Beijing, China (Z.L., X.G., J.Z., W.Y.)
- Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing, China (Z.L., X.G., J.Z., W.Y.)
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, Peking University, Beijing, China (W.Y.)
| | - Tao Xu
- Department of Urology, Peking University People’s Hospital, Beijing, China (Q.W., J.H., Y.D., T.X.)
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3
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The Immunosuppressive Effect of TNFR2 Expression in the Colorectal Cancer Microenvironment. Biomedicines 2023; 11:biomedicines11010173. [PMID: 36672682 PMCID: PMC9856189 DOI: 10.3390/biomedicines11010173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 01/01/2023] [Accepted: 01/03/2023] [Indexed: 01/12/2023] Open
Abstract
Colorectal cancer (CRC) represents one of the most common causes of death among cancers worldwide. Its incidence has been increasing among the young population. Many risk factors contribute to the development and progression of CRC and about 70% of them are sporadic. The CRC microenvironment is highly heterogeneous and represents a very complex immunosuppressive platform. Many cytokines and their receptors are vital participants in this immunosuppressive microenvironment. Tumor necrosis factors (TNFs) and TNF receptor 2 (TNFR2) are critical players in the development of CRC. TNFR2 was observed to have increased the immunosuppressive activity of CRC cells via regulatory T cells (T regs) and myeloid-derived suppressor cells (MDSC) in the CRC microenvironment. However, the exact mechanism of TNFR2 in regulating the CRC prognosis remains elusive. Here, we discuss the role of TNFR2 in immune escape mechanism of CRC in the immunosuppressive cells, including Tregs and MDSCs, and the complex signaling pathways that facilitate the development of CRC. It is suggested that extensive studies on TNFR2 downstream signaling must be done, since TNFR2 has a high potential to be developed into a therapeutic agent and cancer biomarker in the future.
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Millar MW, Fazal F, Rahman A. Therapeutic Targeting of NF-κB in Acute Lung Injury: A Double-Edged Sword. Cells 2022; 11:3317. [PMID: 36291185 PMCID: PMC9601210 DOI: 10.3390/cells11203317] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 01/11/2023] Open
Abstract
Acute lung injury/acute respiratory distress syndrome (ALI/ARDS) is a devastating disease that can be caused by a variety of conditions including pneumonia, sepsis, trauma, and most recently, COVID-19. Although our understanding of the mechanisms of ALI/ARDS pathogenesis and resolution has considerably increased in recent years, the mortality rate remains unacceptably high (~40%), primarily due to the lack of effective therapies for ALI/ARDS. Dysregulated inflammation, as characterized by massive infiltration of polymorphonuclear leukocytes (PMNs) into the airspace and the associated damage of the capillary-alveolar barrier leading to pulmonary edema and hypoxemia, is a major hallmark of ALI/ARDS. Endothelial cells (ECs), the inner lining of blood vessels, are important cellular orchestrators of PMN infiltration in the lung. Nuclear factor-kappa B (NF-κB) plays an essential role in rendering the endothelium permissive for PMN adhesion and transmigration to reach the inflammatory site. Thus, targeting NF-κB in the endothelium provides an attractive approach to mitigate PMN-mediated vascular injury, not only in ALI/ARDS, but in other inflammatory diseases as well in which EC dysfunction is a major pathogenic mechanism. This review discusses the role and regulation of NF-κB in the context of EC inflammation and evaluates the potential and problems of targeting it as a therapy for ALI/ARDS.
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Affiliation(s)
| | | | - Arshad Rahman
- Department of Pediatrics (Neonatology), Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
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Sorrentino A, Menevse AN, Michels T, Volpin V, Durst FC, Sax J, Xydia M, Hussein A, Stamova S, Spoerl S, Heuschneider N, Muehlbauer J, Jeltsch KM, Rathinasamy A, Werner-Klein M, Breinig M, Mikietyn D, Kohler C, Poschke I, Purr S, Reidell O, Martins Freire C, Offringa R, Gebhard C, Spang R, Rehli M, Boutros M, Schmidl C, Khandelwal N, Beckhove P. Salt-inducible kinase 3 protects tumor cells from cytotoxic T-cell attack by promoting TNF-induced NF-κB activation. J Immunother Cancer 2022; 10:jitc-2021-004258. [PMID: 35606086 PMCID: PMC9174898 DOI: 10.1136/jitc-2021-004258] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/29/2022] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Cancer immunotherapeutic strategies showed unprecedented results in the clinic. However, many patients do not respond to immuno-oncological treatments due to the occurrence of a plethora of immunological obstacles, including tumor intrinsic mechanisms of resistance to cytotoxic T-cell (TC) attack. Thus, a deeper understanding of these mechanisms is needed to develop successful immunotherapies. METHODS To identify novel genes that protect tumor cells from effective TC-mediated cytotoxicity, we performed a genetic screening in pancreatic cancer cells challenged with tumor-infiltrating lymphocytes and antigen-specific TCs. RESULTS The screening revealed 108 potential genes that protected tumor cells from TC attack. Among them, salt-inducible kinase 3 (SIK3) was one of the strongest hits identified in the screening. Both genetic and pharmacological inhibitions of SIK3 in tumor cells dramatically increased TC-mediated cytotoxicity in several in vitro coculture models, using different sources of tumor and TCs. Consistently, adoptive TC transfer of TILs led to tumor growth inhibition of SIK3-depleted cancer cells in vivo. Mechanistic analysis revealed that SIK3 rendered tumor cells susceptible to tumor necrosis factor (TNF) secreted by tumor-activated TCs. SIK3 promoted nuclear factor kappa B (NF-κB) nuclear translocation and inhibited caspase-8 and caspase-9 after TNF stimulation. Chromatin accessibility and transcriptome analyses showed that SIK3 knockdown profoundly impaired the expression of prosurvival genes under the TNF-NF-κB axis. TNF stimulation led to SIK3-dependent phosphorylation of the NF-κB upstream regulators inhibitory-κB kinase and NF-kappa-B inhibitor alpha on the one side, and to inhibition of histone deacetylase 4 on the other side, thus sustaining NF-κB activation and nuclear stabilization. A SIK3-dependent gene signature of TNF-mediated NF-κB activation was found in a majority of pancreatic cancers where it correlated with increased cytotoxic TC activity and poor prognosis. CONCLUSION Our data reveal an abundant molecular mechanism that protects tumor cells from cytotoxic TC attack and demonstrate that pharmacological inhibition of this pathway is feasible.
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Affiliation(s)
- Antonio Sorrentino
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Translational Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Ayse Nur Menevse
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Tillmann Michels
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Translational Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Valentina Volpin
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Translational Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | | | - Julian Sax
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Maria Xydia
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Abir Hussein
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Slava Stamova
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Steffen Spoerl
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Department of Oral and Maxillofacial Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Nicole Heuschneider
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Jasmin Muehlbauer
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | | | - Anchana Rathinasamy
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Melanie Werner-Klein
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Experimental Medicine and Therapy Research, University of Regensburg, Regensburg, Germany
| | - Marco Breinig
- Signalling and Functional Genomics, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Helmholtz-University Group 'Cell Plasticity and Epigenetic Remodeling', German Cancer Research Center (DKFZ), Heidelberg, Germany
- Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Damian Mikietyn
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Christian Kohler
- Institute of Functional Genomics, University of Regensburg, Regensburg, Germany
| | - Isabel Poschke
- Molecular Oncology of Gastrointestinal Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
- DKTK CCU Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Immune Monitoring Unit, National Center for Tumor Diseases (NCT), Heidelberg, Germany
| | - Sabrina Purr
- Joint Immunotherapeutics Laboratory, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Olivia Reidell
- Research Department, iOmx Therapeutics, Munich/Martinsried, Germany
| | | | - Rienk Offringa
- Molecular Oncology of Gastrointestinal Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Claudia Gebhard
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Rainer Spang
- Functional Genomics, University of Regensburg, Regensburg, Germany
| | - Michael Rehli
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Michael Boutros
- Signalling and Functional Genomics, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Christian Schmidl
- Junior Group 'Epigenetic Immunooncology', Leibniz Institute for Immunotherapy, Regensburg, Germany
| | - Nisit Khandelwal
- Translational Immunology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Research Department, iOmx Therapeutics, Munich/Martinsried, Germany
| | - Philipp Beckhove
- Division of Interventional Immunology, Leibniz Institute for Immunotherapy, Regensburg, Germany
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
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6
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Li M, Zhang X, Bai X, Liang T. Targeting TNFR2: A Novel Breakthrough in the Treatment of Cancer. Front Oncol 2022; 12:862154. [PMID: 35494080 PMCID: PMC9048045 DOI: 10.3389/fonc.2022.862154] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/22/2022] [Indexed: 12/18/2022] Open
Abstract
Tumor necrosis factor (TNF) receptor type II (TNFR2) is expressed in various tumor cells and some immune cells, such as regulatory T cells and myeloid-derived suppressing cells. TNFR2 contributes a lot to the tumor microenvironment. For example, it directly promotes the occurrence and growth of some tumor cells, activates immunosuppressive cells, and supports immune escape. Existing studies have proved the importance of TNFR2 in cancer treatment. Here, we reviewed the activation mechanism of TNFR2 and its role in signal transduction in the tumor microenvironment. We summarized the expression and function of TNFR2 within different immune cells and the potential opportunities and challenges of targeting TNFR2 in immunotherapy. Finally, the advantages and limitations of TNFR2 to treat tumor-related diseases are discussed, and the problems that may be encountered in the clinical development and application of targeted anti-TNFR2 agonists and inhibitors are analyzed.
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Affiliation(s)
- Muchun Li
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Pancreatic Disease, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Innovation Center for the Study of Pancreatic Diseases, Hangzhou, China
- Zhejiang Provincial Clinical Research Center for the Study of Hepatobiliary & Pancreatic Diseases, Hangzhou, China
| | - Xiaozhen Zhang
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Pancreatic Disease, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Innovation Center for the Study of Pancreatic Diseases, Hangzhou, China
- Zhejiang Provincial Clinical Research Center for the Study of Hepatobiliary & Pancreatic Diseases, Hangzhou, China
| | - Xueli Bai
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Pancreatic Disease, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Innovation Center for the Study of Pancreatic Diseases, Hangzhou, China
- Zhejiang Provincial Clinical Research Center for the Study of Hepatobiliary & Pancreatic Diseases, Hangzhou, China
- *Correspondence: Tingbo Liang, ; Xueli Bai,
| | - Tingbo Liang
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Pancreatic Disease, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Zhejiang Provincial Innovation Center for the Study of Pancreatic Diseases, Hangzhou, China
- Zhejiang Provincial Clinical Research Center for the Study of Hepatobiliary & Pancreatic Diseases, Hangzhou, China
- Cancer Center, Zhejiang University, Hangzhou, China
- *Correspondence: Tingbo Liang, ; Xueli Bai,
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Cataldi S, Aprile M, Melillo D, Mucel I, Giorgetti-Peraldi S, Cormont M, Italiani P, Blüher M, Tanti JF, Ciccodicola A, Costa V. TNFα Mediates Inflammation-Induced Effects on PPARG Splicing in Adipose Tissue and Mesenchymal Precursor Cells. Cells 2021; 11:cells11010042. [PMID: 35011604 PMCID: PMC8750445 DOI: 10.3390/cells11010042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 12/16/2021] [Accepted: 12/20/2021] [Indexed: 01/18/2023] Open
Abstract
Low-grade chronic inflammation and reduced differentiation capacity are hallmarks of hypertrophic adipose tissue (AT) and key contributors of insulin resistance. We identified PPARGΔ5 as a dominant-negative splicing isoform overexpressed in the AT of obese/diabetic patients able to impair adipocyte differentiation and PPARγ activity in hypertrophic adipocytes. Herein, we investigate the impact of macrophage-secreted pro-inflammatory factors on PPARG splicing, focusing on PPARGΔ5. We report that the epididymal AT of LPS-treated mice displays increased PpargΔ5/cPparg ratio and reduced expression of Pparg-regulated genes. Interestingly, pro-inflammatory factors secreted from murine and human pro-inflammatory macrophages enhance the PPARGΔ5/cPPARG ratio in exposed adipogenic precursors. TNFα is identified herein as factor able to alter PPARG splicing—increasing PPARGΔ5/cPPARG ratio—through PI3K/Akt signaling and SRp40 splicing factor. In line with in vitro data, TNFA expression is higher in the SAT of obese (vs. lean) patients and positively correlates with PPARGΔ5 levels. In conclusion, our results indicate that inflammatory factors secreted by metabolically-activated macrophages are potent stimuli that modulate the expression and splicing of PPARG. The resulting imbalance between canonical and dominant negative isoforms may crucially contribute to impair PPARγ activity in hypertrophic AT, exacerbating the defective adipogenic capacity of precursor cells.
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Affiliation(s)
- Simona Cataldi
- Institute of Genetics and Biophysics ‘‘Adriano Buzzati-Traverso’’, CNR, Via P. Castellino 111, 80131 Naples, Italy; (S.C.); (M.A.); (A.C.)
| | - Marianna Aprile
- Institute of Genetics and Biophysics ‘‘Adriano Buzzati-Traverso’’, CNR, Via P. Castellino 111, 80131 Naples, Italy; (S.C.); (M.A.); (A.C.)
| | - Daniela Melillo
- Institute of Biochemistry and Cell Biology, CNR, Via P. Castellino 111, 80131 Naples, Italy; (D.M.); (P.I.)
| | - Inès Mucel
- Université Côte d’Azur, Inserm UMR1065, C3M, Team Cellular and Molecular Pathophysiology of Obesity, 06204 Nice, France; (I.M.); (S.G.-P.); (M.C.); (J.-F.T.)
| | - Sophie Giorgetti-Peraldi
- Université Côte d’Azur, Inserm UMR1065, C3M, Team Cellular and Molecular Pathophysiology of Obesity, 06204 Nice, France; (I.M.); (S.G.-P.); (M.C.); (J.-F.T.)
| | - Mireille Cormont
- Université Côte d’Azur, Inserm UMR1065, C3M, Team Cellular and Molecular Pathophysiology of Obesity, 06204 Nice, France; (I.M.); (S.G.-P.); (M.C.); (J.-F.T.)
| | - Paola Italiani
- Institute of Biochemistry and Cell Biology, CNR, Via P. Castellino 111, 80131 Naples, Italy; (D.M.); (P.I.)
| | - Matthias Blüher
- Medical Department III-Endocrinology, Nephrology and Rheumatology, University of Leipzig, 04103 Leipzig, Germany;
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, Philipp-Rosenthal-Str. 27, 04103 Leipzig, Germany
| | - Jean-François Tanti
- Université Côte d’Azur, Inserm UMR1065, C3M, Team Cellular and Molecular Pathophysiology of Obesity, 06204 Nice, France; (I.M.); (S.G.-P.); (M.C.); (J.-F.T.)
| | - Alfredo Ciccodicola
- Institute of Genetics and Biophysics ‘‘Adriano Buzzati-Traverso’’, CNR, Via P. Castellino 111, 80131 Naples, Italy; (S.C.); (M.A.); (A.C.)
- Department of Science and Technology, University of Naples ‘‘Parthenope’’, 80143 Naples, Italy
| | - Valerio Costa
- Institute of Genetics and Biophysics ‘‘Adriano Buzzati-Traverso’’, CNR, Via P. Castellino 111, 80131 Naples, Italy; (S.C.); (M.A.); (A.C.)
- Correspondence: ; Tel.: +39-0816132617
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8
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Ahmad S, Hatmal MM, Lambuk L, Al-Hatamleh MAI, Alshaer W, Mohamud R. The role of TNFR2 + Tregs in COVID-19: An overview and a potential therapeutic strategy. Life Sci 2021; 286:120063. [PMID: 34673116 PMCID: PMC8523334 DOI: 10.1016/j.lfs.2021.120063] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 10/12/2021] [Accepted: 10/13/2021] [Indexed: 02/08/2023]
Abstract
COVID-19 is a multi-faceted disease ranging from asymptomatic to severely ill condition that primarily affects the lungs and could advance to other organs as well. It's causing factor, SARS-CoV-2 is recognized to develop robust cell-mediated immunity that responsible to either control or exaggerate the infection. As an important cell subset that control immune responses and are significantly dysregulated in COVID-19, Tregs is proposed to be considered for COVID-19 management. Among its hallmark, TNFR2 is recently recognized to play important role in the function and survival of Tregs. This review gathers available TNFR2 agonists to directly target Tregs as a potential approach to overcome immune dysregulation that affect the severity in COVID-19. Furthermore, this review performs a rigid body docking of TNF-TNFR2 interaction and such interaction with TNFR2 agonist to predict the optimal targeting approach.
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Affiliation(s)
- Suhana Ahmad
- Department of Immunology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia
| | - Ma'mon M Hatmal
- Department of Medical Laboratory Sciences, Faculty of Applied Health Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Lidawani Lambuk
- Department of Immunology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia
| | - Mohammad A I Al-Hatamleh
- Department of Immunology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia
| | - Walhan Alshaer
- Cell Therapy Center (CTC), The University of Jordan, Amman 11942, Jordan
| | - Rohimah Mohamud
- Department of Immunology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia.
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9
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Gusev E, Sarapultsev A, Hu D, Chereshnev V. Problems of Pathogenesis and Pathogenetic Therapy of COVID-19 from the Perspective of the General Theory of Pathological Systems (General Pathological Processes). Int J Mol Sci 2021; 22:7582. [PMID: 34299201 PMCID: PMC8304657 DOI: 10.3390/ijms22147582] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/30/2021] [Accepted: 07/12/2021] [Indexed: 01/18/2023] Open
Abstract
The COVID-19 pandemic examines not only the state of actual health care but also the state of fundamental medicine in various countries. Pro-inflammatory processes extend far beyond the classical concepts of inflammation. They manifest themselves in a variety of ways, beginning with extreme physiology, then allostasis at low-grade inflammation, and finally the shockogenic phenomenon of "inflammatory systemic microcirculation". The pathogenetic core of critical situations, including COVID-19, is this phenomenon. Microcirculatory abnormalities, on the other hand, lie at the heart of a specific type of general pathological process known as systemic inflammation (SI). Systemic inflammatory response, cytokine release, cytokine storm, and thrombo-inflammatory syndrome are all terms that refer to different aspects of SI. As a result, the metabolic syndrome model does not adequately reflect the pathophysiology of persistent low-grade systemic inflammation (ChSLGI). Diseases associated with ChSLGI, on the other hand, are risk factors for a severe COVID-19 course. The review examines the role of hypoxia, metabolic dysfunction, scavenger receptors, and pattern-recognition receptors, as well as the processes of the hemophagocytic syndrome, in the systemic alteration and development of SI in COVID-19.
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Affiliation(s)
- Evgenii Gusev
- Institute of Immunology and Physiology, Ural Branch of the Russian Academy of Science, 620049 Ekaterinburg, Russia; (E.G.); (V.C.)
| | - Alexey Sarapultsev
- Institute of Immunology and Physiology, Ural Branch of the Russian Academy of Science, 620049 Ekaterinburg, Russia; (E.G.); (V.C.)
- School of Medical Biology, South Ural State University, 454080 Chelyabinsk, Russia
| | - Desheng Hu
- Department of Integrated Traditional Chinese and Western Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 200092, China;
| | - Valeriy Chereshnev
- Institute of Immunology and Physiology, Ural Branch of the Russian Academy of Science, 620049 Ekaterinburg, Russia; (E.G.); (V.C.)
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10
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Latifi-Navid H, Soheili ZS, Samiei S, Sadeghi M, Taghizadeh S, Pirmardan ER, Ahmadieh H. Network analysis and the impact of Aflibercept on specific mediators of angiogenesis in HUVEC cells. J Cell Mol Med 2021; 25:8285-8299. [PMID: 34250732 PMCID: PMC8419159 DOI: 10.1111/jcmm.16778] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/25/2021] [Accepted: 06/11/2021] [Indexed: 12/31/2022] Open
Abstract
Angiogenesis, inflammation and endothelial cells’ migration and proliferation exert fundamental roles in different diseases. However, more studies are needed to identify key proteins and pathways involved in these processes. Aflibercept has received the approval of the US Food and Drug Administration (FDA) for the treatment of wet AMD and colorectal cancer. Moreover, the effect of Aflibercept on VEGFR2 downstream signalling pathways has not been investigated yet. Here, we integrated text mining data, protein‐protein interaction networks and multi‐experiment microarray data to specify candidate genes that are involved in VEGFA/VEGFR2 signalling pathways. Network analysis of candidate genes determined the importance of the nominated genes via different centrality parameters. Thereupon, several genes—with the highest centrality indexes—were recruited to investigate the impact of Aflibercept on their expression pattern in HUVEC cells. Real‐time PCR was performed, and relative expression of the specific genes revealed that Aflibercept modulated angiogenic process by VEGF/PI3KA/AKT/mTOR axis, invasion by MMP14/MMP9 axis and inflammation‐related angiogenesis by IL‐6‐STAT3 axis. Data showed Aflibercept simultaneously affected these processes and determined the nominated axes that had been affected by the drug. Furthermore, integrating the results of Aflibercept on expression of candidate genes with the current network analysis suggested that resistance against the Aflibercept effect is a plausible process in HUVEC cells.
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Affiliation(s)
- Hamid Latifi-Navid
- Department of Molecular Medicine, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Zahra-Soheila Soheili
- Department of Molecular Medicine, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Shahram Samiei
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - Mehdi Sadeghi
- Department of Medical Genetics, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran.,School of Biological Sciences, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
| | - Sepideh Taghizadeh
- Department of Molecular Medicine, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Ehsan Ranaei Pirmardan
- Ocular Tissue Engineering Research Center, Molecular Biomarkers Nano-Imaging Laboratory, Brigham and Women's Hospital, Boston, Massachusetts, USA.,Department of Radiology, Harvard Medical School, Boston, Massachusetts, USA
| | - Hamid Ahmadieh
- Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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11
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Molecular Dambusters: What Is Behind Hyperpermeability in Bradykinin-Mediated Angioedema? Clin Rev Allergy Immunol 2021; 60:318-347. [PMID: 33725263 PMCID: PMC7962090 DOI: 10.1007/s12016-021-08851-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/07/2021] [Indexed: 02/08/2023]
Abstract
In the last few decades, a substantial body of evidence underlined the pivotal role of bradykinin in certain types of angioedema. The formation and breakdown of bradykinin has been studied thoroughly; however, numerous questions remained open regarding the triggering, course, and termination of angioedema attacks. Recently, it became clear that vascular endothelial cells have an integrative role in the regulation of vessel permeability. Apart from bradykinin, a great number of factors of different origin, structure, and mechanism of action are capable of modifying the integrity of vascular endothelium, and thus, may participate in the regulation of angioedema formation. Our aim in this review is to describe the most important permeability factors and the molecular mechanisms how they act on endothelial cells. Based on endothelial cell function, we also attempt to explain some of the challenging findings regarding bradykinin-mediated angioedema, where the function of bradykinin itself cannot account for the pathophysiology. By deciphering the complex scenario of vascular permeability regulation and edema formation, we may gain better scientific tools to be able to predict and treat not only bradykinin-mediated but other types of angioedema as well.
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12
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TNF-TNFR2 Signal Plays a Decisive Role in the Activation of CD4 +Foxp3 + Regulatory T Cells: Implications in the Treatment of Autoimmune Diseases and Cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1278:257-272. [PMID: 33523452 DOI: 10.1007/978-981-15-6407-9_13] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The puzzling biphasic or dual roles of tumor necrosis factor α (TNF) in the inflammatory and immune responses are likely to be mediated by distinct signaling pathways transduced by one of its two receptors, e.g., TNF receptor type I (TNFR1) and TNF receptor type II (TNFR2). Unlike TNFR1 that is ubiquitously expressed on almost all types of cells, the expression of TNFR2 is rather restricted to certain types of cells, such as T lymphocytes. There is now compelling evidence that TNFR2 is preferentially expressed by CD4+Foxp3+ regulatory T cells (Tregs), and TNFR2 plays a decisive role in the activation, expansion, in vivo function, and phenotypical stability of Tregs. In this chapter, the current understanding of the molecular basis and signaling pathway of TNF-TNFRs signal is introduced. Latest studies that have further supported and substantiated the pivotal role of TNF-TNFR2 interaction in Tregs biology and its molecular basis are discussed. The research progress regarding TNFR2-targeting treatment for autoimmune diseases and cancer is analyzed. Future study should focus on the further understanding of molecular mechanism underlying Treg-stimulatory effect of TNFR2 signal, as well as on the translation of research findings into therapeutic benefits of human patients with autoimmune diseases, allergy, allograft rejection, and cancer.
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13
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Nitric Oxide/Cyclic GMP-Dependent Calcium Signalling Mediates IL-6- and TNF-α-Induced Expression of Glial Fibrillary Acid Protein. J Mol Neurosci 2020; 71:854-866. [PMID: 32964397 PMCID: PMC7969574 DOI: 10.1007/s12031-020-01708-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 09/07/2020] [Indexed: 12/24/2022]
Abstract
Astrocyte activation is characterized by hypertrophy with increased glial fibrillary acidic protein (GFAP), whose expression may involve pro-inflammatory cytokines. In this study, the effects of pro-inflammatory IL-6 and TNF-α and anti-inflammatory cytokines IL-4 and IL-10 on nitric oxide (NO)/cyclic guanosine monophosphate (cGMP) signalling, intracellular calcium concentration ([Ca2+]i) and GFAP expression were investigated. In human glioblastoma astrocytoma U-373 MG cells, IL-6 and TNF-α, but not IL-4 or IL-10, increased iNOS, cGMP, [Ca2+]i and GFAP expression. The inhibitors of iNOS (1400 W), soluble guanylyl cyclase (ODQ) and IP3 receptors (ryanodine and 2-APB) reversed the increase in cGMP or [Ca2+]i, respectively, and prevented GFAP expression. In rat striatal slices, IL-6 and TNF-α, at variance with IL-4 and IL-10, promoted a concentration-dependent increase in Ca2+ efflux, an effect prevented by 1400 W, ODQ and RY/2APB. These data were confirmed by in vivo studies, where IL-6, TNF-α or the NO donor DETA/NO injected in the striatum of anaesthetised rats increased cGMP levels and increased GFAP expression. The present findings point to NO/cGMP-dependent calcium signalling as part of the mechanism mediating IL-6- and TNF-α-induced GFAP expression. As this process plays a fundamental role in driving neurotoxicity, targeting NO/cGMP-dependent calcium signalling may constitute a new approach for therapeutic interventions in neurological disorders.
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14
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Tarasiuk E, Bonda TA, Dziemidowicz M, Winnicka MM, Bernaczyk P, Kamiński KA. The effect of interleukin 6 deficiency on myocardial signal transduction pathways activation induced by bacterial lipopolysaccharide in young and old mice. Adv Med Sci 2020; 65:386-393. [PMID: 32693349 DOI: 10.1016/j.advms.2020.06.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 05/13/2020] [Accepted: 06/20/2020] [Indexed: 11/19/2022]
Abstract
PURPOSE Exaggerated release of proinflammatory mediators during sepsis contributes to inadequate vasodilatation and depressed myocardial contractility, which lead to development of shock and circulatory collapse. The aim of the study was to evaluate the effect of IL-6 and aging on activation of intracellular signaling pathways in the myocardium induced by bacterial lipopolysaccharide (LPS) administration. MATERIAL/METHODS LPS was injected intraperitoneally to male 3- and 24-month old mice with systemic IL-6 gene knock-out (IL-6KO) and the reference strain (WT). LPS was given intraperitoneally in single low (0.1 mg/kg) or high (10 mg/kg) dose, or in two doses (0.1 + 10 mg/kg) with 24-h delay. The expression and phosphorylation of STAT3, ERK1/2, Akt1/2/3 proteins in the left ventricular myocardium was evaluated after 24 h using Western blotting. RESULTS Low LPS dose induced higher STAT3 phosphorylation only in old IL-6KO mice, not affecting ERK1/2 and Akt1/2/3 phosphorylation in any group. High LPS dose upregulated STAT3 phosphorylation similarly in all groups, reduced ERK1/2 expression in young WT mice and upregulated Akt1/2/3 expression and phosphorylation in young IL-6KO mice. Pretreatment with low LPS dose attenuated phosphorylation of STAT3 in both old groups and phosphorylation of Akt1/2/3 in young IL-6KO group. Two-dose approach also significantly potentiated ERK1/2 phosphorylation in both old groups. CONCLUSIONS Obtained results show that IL-6 deficiency alters the activity of intracellular signaling pathways: JAK/STAT in old and Akt in young LPS-treated mice. This may indicate that lack of IL-6 attenuates Akt-related cytoprotective effect of pretreatment with low LPS dose in young but not in aged animals.
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Affiliation(s)
- Ewa Tarasiuk
- Department of Cardiology, Medical University of Bialystok, Bialystok, Poland
| | - Tomasz A Bonda
- Department of General and Experimental Pathology, Medical University of Bialystok, Bialystok, Poland
| | - Magdalena Dziemidowicz
- Department of General and Experimental Pathology, Medical University of Bialystok, Bialystok, Poland
| | - Maria M Winnicka
- Department of General and Experimental Pathology, Medical University of Bialystok, Bialystok, Poland
| | - Piotr Bernaczyk
- Department of Medical Pathomorphology, Medical University of Bialystok, Bialystok, Poland
| | - Karol A Kamiński
- Department of Cardiology, Medical University of Bialystok, Bialystok, Poland; Department of Population Medicine and Civilization Diseases Prevention, Medical University of Bialystok, Bialystok, Poland.
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15
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Mahdavi Sharif P, Jabbari P, Razi S, Keshavarz-Fathi M, Rezaei N. Importance of TNF-alpha and its alterations in the development of cancers. Cytokine 2020; 130:155066. [PMID: 32208336 DOI: 10.1016/j.cyto.2020.155066] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
TNF-alpha is involved in many physiologic and pathologic cellular pathways, including cellular proliferation, differentiation, and death, regulation of immunologic reactions to different cells and molecules, local and vascular invasion of neoplasms, and destruction of tumor vasculature. It is obvious that because of integrated functions of TNF-alpha inside different physiologic systems, it cannot be used as a single-agent therapy for neoplasms; however, long-term investigation of its different cellular pathways has led to recognition of a variety of subsequent molecules with more specific interactions, and therefore, might be suitable as prognostic and therapeutic factors for neoplasms. Here, we will review different aspects of the TNF-alpha as a cytokine involved in both physiologic functions of cells and pathologic abnormalities, most importantly, cancers.
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Affiliation(s)
- Pouya Mahdavi Sharif
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran; School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Parnian Jabbari
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Sepideh Razi
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran; Student Research Committee, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mahsa Keshavarz-Fathi
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran; School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Nima Rezaei
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Sheffield, UK.
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16
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Jung HS, Shimizu-Albergine M, Shen X, Kramer F, Shao D, Vivekanandan-Giri A, Pennathur S, Tian R, Kanter JE, Bornfeldt KE. TNF-α induces acyl-CoA synthetase 3 to promote lipid droplet formation in human endothelial cells. J Lipid Res 2020; 61:33-44. [PMID: 31722970 PMCID: PMC6939593 DOI: 10.1194/jlr.ra119000256] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/22/2019] [Indexed: 01/20/2023] Open
Abstract
Chronic inflammation contributes to cardiovascular disease. Increased levels of the inflammatory cytokine, TNF-α, are often present in conditions associated with cardiovascular disease risk, and TNF-α induces a number of pro-atherogenic effects in macrovascular endothelial cells, including expression of adhesion molecules and chemokines, and lipoprotein uptake and transcytosis to the subendothelial tissue. However, little is known about the roles of acyl-CoA synthetases (ACSLs), enzymes that esterify free fatty acids into their acyl-CoA derivatives, or about the effects of TNF-α on ACSLs in endothelial cells. Therefore, we investigated the effects of TNF-α on ACSLs and downstream lipids in cultured human coronary artery endothelial cells and human umbilical vein endothelial cells. We demonstrated that TNF-α induces ACSL1, ACSL3, and ACSL5, but not ACSL4, in both cell types. TNF-α also increased oleoyl-CoA levels, consistent with the increased ACSL3 expression. RNA-sequencing demonstrated that knockdown of ACSL3 had no marked effects on the TNF-α transcriptome. Instead, ACSL3 was required for TNF-α-induced lipid droplet formation in cells exposed to oleic acid. These results demonstrate that increased acyl-CoA synthesis as a result of ACSL3 induction is part of the TNF-α response in human macrovascular endothelial cells.
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Affiliation(s)
- Hye Seung Jung
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Masami Shimizu-Albergine
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Xia Shen
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Farah Kramer
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Dan Shao
- Departments of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA 98109
| | | | | | - Rong Tian
- Departments of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA 98109
| | - Jenny E Kanter
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Karin E Bornfeldt
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109; Pathology, University of Washington, Seattle, WA 98109.
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17
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Endothelial injury is closely related to osteopontin and TNF receptor-mediated inflammation in end-stage renal disease. Cytokine 2019; 121:154729. [DOI: 10.1016/j.cyto.2019.05.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/27/2019] [Accepted: 05/19/2019] [Indexed: 12/19/2022]
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18
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Chen LS, Singh SP, Müller G, Bornstein SR, Kanczkowski W. Transcriptional Analysis of Sepsis-Induced Activation and Damage of the Adrenal Endothelial Microvascular Cells. Front Endocrinol (Lausanne) 2019; 10:944. [PMID: 32038494 PMCID: PMC6987315 DOI: 10.3389/fendo.2019.00944] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 12/31/2019] [Indexed: 11/23/2022] Open
Abstract
Bacterial sepsis is a serious threat to the body homeostasis and is often associated with high mortality in non-coronary intensive stations. In order to survive sepsis, rapid activation of the hypothalamus-pituitary-adrenal gland axis and sympathomedullary system is necessary. In many patients with sepsis, the function of those two arms of the stress system is dysregulated with underlying mechanisms remaining unknown. In our previous experimental studies, we have demonstrated that LPS-induced systemic inflammation and CLP-induced peritonitis can result in adrenal gland damage. Histological and transcriptomic analysis revealed a potential involvement of the adrenal microvascular endothelium in this process. However, our knowledge about the function of adrenal microvascular cells during sepsis is scarce. In the present study, we have characterized transcriptomic alterations in isolated mouse adrenal microvascular endothelial cells induced by systemic administration of bacterial LPS. Our results revealed that LPS induced a distinct transcriptomic profile in the adrenal microvascular cells, including multiple genes regulating inflammation, activation of the coagulation cascade and vascular permeability. Activation of those genes may be potentially involved in the damage to the microvascular endothelium and altogether contribute to the sepsis-mediated adrenal dysregulation.
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Affiliation(s)
- Lan-Sun Chen
- Institute of Medical Microbiology and Hygiene, Technische Universität Dresden, Dresden, Germany
- Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany
| | | | - Gregor Müller
- Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany
| | - Stefan R. Bornstein
- Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany
| | - Waldemar Kanczkowski
- Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany
- *Correspondence: Waldemar Kanczkowski
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19
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Effects of Vaspin on Insulin Resistance in Rats and Underlying Mechanisms. Sci Rep 2018; 8:13542. [PMID: 30202052 PMCID: PMC6131547 DOI: 10.1038/s41598-018-31923-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 08/29/2018] [Indexed: 12/16/2022] Open
Abstract
Insulin resistance (IR) is the main pathogenesis of metabolic syndrome and a shared pathophysiological change in conditions such as diabetes mellitus, adiposity, hypertension, and atherosclerosis. Visceral adipose tissue-derived serpin (Vaspin) is a newly discovered adipocytokine with insulin-sensitizing and anti-inflammatory effects. To examine if vaspin can improve insulin resistance in rats fed a high-fat diet via the insulin receptor substrate/phosphatidylinositol 3 kinase/protein kinase B/glucose transport (IRS/PI3K/Akt/Glut) and inhibitory κB alpha/nuclear factor-kappa B (IκBα/NF-κB) signalling pathways, thirty male Sprague-Dawley (SD) rats were randomly divided into three groups: the normal control group (NC group, n = 10), high-fat diet group (HFD group, n = 10) and vaspin intervention group (HFD + vaspin group, n = 10). Results showed that intervention with vaspin significantly decreased fasting blood glucose (FBG) and fasting insulin (FINS) concentrations in HFD − fed rats without significantly affecting body weight or triglyceride (TG) or total cholesterol (TC) levels. The areas under the intraperitoneal glucose tolerance test (IPGTT) and the insulin tolerance test (ITT) curves were significantly decreased in HFD + vaspin group compared with the HFD group, and the glucose infusion rate (GIR) showed the same trends. Western blot, real-time polymerase chain reaction (RT-PCR) and immunofluorescence staining showed that vaspin could improve insulin resistance in liver, skeletal muscle and adipose tissue by activating the IRS/PI3K/Akt/Glut signalling pathway and inhibiting the IκBα/NF-κB signalling pathway.
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20
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21
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Yang S, Wang J, Brand DD, Zheng SG. Role of TNF-TNF Receptor 2 Signal in Regulatory T Cells and Its Therapeutic Implications. Front Immunol 2018; 9:784. [PMID: 29725328 PMCID: PMC5916970 DOI: 10.3389/fimmu.2018.00784] [Citation(s) in RCA: 235] [Impact Index Per Article: 39.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Accepted: 03/28/2018] [Indexed: 12/24/2022] Open
Abstract
Tumor necrosis factor α (TNFα) is a pleiotropic cytokine which signals through TNF receptor 1 (TNFR1) and TNF receptor 2 (TNFR2). Emerging evidence has demonstrated that TNFR1 is ubiquitously expressed on almost all cells, while TNFR2 exhibits a limited expression, predominantly on regulatory T cells (Tregs). In addition, the signaling pathway by sTNF via TNFR1 mainly triggers pro-inflammatory pathways, and mTNF binding to TNFR2 usually initiates immune modulation and tissue regeneration. TNFα plays a critical role in upregulation or downregulation of Treg activity. Deficiency in TNFR2 signaling is significant in various autoimmune diseases. An ideal therapeutic strategy for autoimmune diseases would be to selectively block the sTNF/TNFR1 signal through the administration of sTNF inhibitors, or using TNFR1 antagonists while keeping the TNFR2 signaling pathway intact. Another promising strategy would be to rely on TNFR2 agonists which could drive the expansion of Tregs and promote tissue regeneration. Design of these therapeutic strategies targeting the TNFR1 or TNFR2 signaling pathways holds promise for the treatment of diverse inflammatory and degenerative diseases.
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Affiliation(s)
- Sujuan Yang
- Department of Clinical Immunology, Third Hospital at Sun Yat-sen University, Guangzhou, China.,Division of Rheumatology, Milton S. Hershey Medical Center at Penn State University, Hershey, PA, United States
| | - Julie Wang
- Division of Rheumatology, Milton S. Hershey Medical Center at Penn State University, Hershey, PA, United States
| | | | - Song Guo Zheng
- Division of Rheumatology, Milton S. Hershey Medical Center at Penn State University, Hershey, PA, United States
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22
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Fortini F, Vieceli Dalla Sega F, Caliceti C, Aquila G, Pannella M, Pannuti A, Miele L, Ferrari R, Rizzo P. Estrogen receptor β-dependent Notch1 activation protects vascular endothelium against tumor necrosis factor α (TNFα)-induced apoptosis. J Biol Chem 2017; 292:18178-18191. [PMID: 28893903 DOI: 10.1074/jbc.m117.790121] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Revised: 09/05/2017] [Indexed: 12/17/2022] Open
Abstract
Unlike age-matched men, premenopausal women benefit from cardiovascular protection. Estrogens protect against apoptosis of endothelial cells (ECs), one of the hallmarks of endothelial dysfunction leading to cardiovascular disorders, but the underlying molecular mechanisms remain poorly understood. The inflammatory cytokine TNFα causes EC apoptosis while dysregulating the Notch pathway, a major contributor to EC survival. We have previously reported that 17β-estradiol (E2) treatment activates Notch signaling in ECs. Here, we sought to assess whether in TNFα-induced inflammation Notch is involved in E2-mediated protection of the endothelium. We treated human umbilical vein endothelial cells (HUVECs) with E2, TNFα, or both and found that E2 counteracts TNFα-induced apoptosis. When Notch1 was inhibited, this E2-mediated protection was not observed, whereas ectopic overexpression of Notch1 diminished TNFα-induced apoptosis. Moreover, TNFα reduced the levels of active Notch1 protein, which were partially restored by E2 treatment. Moreover, siRNA-mediated knockdown of estrogen receptor β (ERβ), but not ERα, abolished the effect of E2 on apoptosis. Additionally, the E2-mediated regulation of the levels of active Notch1 was abrogated after silencing ERβ. In summary, our results indicate that E2 requires active Notch1 through a mechanism involving ERβ to protect the endothelium in TNFα-induced inflammation. These findings could be relevant for assessing the efficacy and applicability of menopausal hormone treatment, because they may indicate that in women with impaired Notch signaling, hormone therapy might not effectively protect the endothelium.
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Affiliation(s)
| | | | - Cristiana Caliceti
- the Department of Chemistry "G. Ciamician" and Interdepartmental Centre for Industrial Research in Energy and Environment (CIRI EA), University of Bologna, 40126 Bologna, Italy.,the National Institute of Biostructures and Biosystems (INBB), 00136 Rome, Italy
| | | | - Micaela Pannella
- the Interdepartmental Center for Industrial Research and Life Sciences (CIRI-SDV), Foundation IRET, University of Bologna, 40064 Ozzano Emilia (BO), Italy
| | - Antonio Pannuti
- the Stanley Scott Cancer Center, Louisiana State University Health Sciences Center and Louisiana Cancer Research Consortium, New Orleans, Louisiana 70112
| | - Lucio Miele
- the Stanley Scott Cancer Center, Louisiana State University Health Sciences Center and Louisiana Cancer Research Consortium, New Orleans, Louisiana 70112
| | - Roberto Ferrari
- From the Departments of Medical Sciences and.,the Maria Cecilia Hospital, GVM Care and Research, E.S. Health Science Foundation, 48033 Cotignola, Italy, and.,the Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Paola Rizzo
- the Maria Cecilia Hospital, GVM Care and Research, E.S. Health Science Foundation, 48033 Cotignola, Italy, and .,the Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy.,Morphology, Surgery and Experimental Medicine, University of Ferrara, 44121 Ferrara, Italy
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The Role of Endoplasmic Reticulum Stress in Cardiovascular Disease and Exercise. Int J Vasc Med 2017; 2017:2049217. [PMID: 28875043 PMCID: PMC5569752 DOI: 10.1155/2017/2049217] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 07/06/2017] [Indexed: 12/18/2022] Open
Abstract
Endoplasmic reticulum (ER) stress, which is highly associated with cardiovascular disease, is triggered by a disturbance in ER function because of protein misfolding or an increase in protein secretion. Prolonged disruption of ER causes ER stress and activation of the unfolded protein response (UPR) and leads to various diseases. Eukaryotic cells respond to ER stress via three major sensors that are bound to the ER membrane: activating transcription factor 6 (ATF6), inositol-requiring protein 1α (IRE1α), and protein kinase RNA-like ER kinase (PERK). Chronic activation of ER stress causes damage in endothelial cells (EC) via apoptosis, inflammation, and oxidative stress signaling pathways. The alleviation of ER stress has recently been accepted as a potential therapeutic target to treat cardiovascular diseases such as heart failure, hypertension, and atherosclerosis. Exercise training is an effective nonpharmacological approach for preventing and alleviating cardiovascular disease. We here review the recent viewing of ER stress-mediated apoptosis and inflammation signaling pathways in cardiovascular disease and the role of exercise in ER stress-associated diseases.
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TLR4 knockout attenuated high fat diet-induced cardiac dysfunction via NF-κB/JNK-dependent activation of autophagy. Biochim Biophys Acta Mol Basis Dis 2017; 1863:2001-2011. [PMID: 28108421 DOI: 10.1016/j.bbadis.2017.01.010] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 01/09/2017] [Accepted: 01/12/2017] [Indexed: 12/19/2022]
Abstract
Obesity is commonly associated with a low grade systemic inflammation, which may contribute to the onset and development of myocardial remodeling and contractile dysfunction. Toll-like receptor 4 (TLR4) plays an important role in innate immunity and inflammation although its role in high fat diet-induced obesity cardiac dysfunction remains elusive. This study was designed to examine the effect of TLR4 ablation on high fat diet intake-induced cardiac anomalies, if any, and underlying mechanism(s) involved. Wild-type (WT) and TLR4 knockout mice were fed normal or high fat (60% calorie from fat) diet for 12weeks prior to assessment of mechanical and intracellular Ca2+ properties. The inflammatory signaling proteins (TLR4, NF-κB, and JNK) and autophagic markers (Atg5, Atg12, LC3B and p62) were evaluated. Our results revealed that high fat diet intake promoted obesity, marked decrease in fractional shortening, and cardiomyocyte contractile capacity with dampened intracellular Ca2+ release and clearance, elevated ROS generation and oxidative stress as measured by aconitase activity, the effects of which were significantly attenuated by TLR4 knockout. In addition, high fat intake downregulated levels of Atg5, Atg12 and LC3B, while increasing p62 accumulation. TLR4 knockout itself did not affect Atg5, Atg12, LC3B and p62 levels while it reconciled high fat diet intake-induced changes in autophagy. In addition, TLR4 knockout alleviated high fat diet-induced phosphorylation of IKKβ, JNK and mTOR. In vitro study revealed that palmitic acid suppressed cardiomyocyte contractile function, the effect of which was inhibited the TLR4 inhibitor CLI-095, the JNK inhibitor AS601245 or the NF-κB inhibitor Celastrol. Taken together, these data showed that TLR4 knockout ameliorated high fat diet-induced cardiac contractile and intracellular Ca2+ anomalies through inhibition of inflammation and ROS, possibly through a NF-κB/JNK-dependent activation of autophagy. This article is part of a Special Issue entitled: Genetic and epigenetic control of heart failure - edited by Jun Ren & Megan Yingmei Zhang.
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Zielińska KA, Van Moortel L, Opdenakker G, De Bosscher K, Van den Steen PE. Endothelial Response to Glucocorticoids in Inflammatory Diseases. Front Immunol 2016; 7:592. [PMID: 28018358 PMCID: PMC5155119 DOI: 10.3389/fimmu.2016.00592] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 11/29/2016] [Indexed: 12/16/2022] Open
Abstract
The endothelium plays a crucial role in inflammation. A balanced control of inflammation requires the action of glucocorticoids (GCs), steroidal hormones with potent cell-specific anti-inflammatory properties. Besides the classic anti-inflammatory effects of GCs on leukocytes, recent studies confirm that endothelial cells also represent an important target for GCs. GCs regulate different aspects of endothelial physiology including expression of adhesion molecules, production of pro-inflammatory cytokines and chemokines, and maintenance of endothelial barrier integrity. However, the regulation of endothelial GC sensitivity remains incompletely understood. In this review, we specifically examine the endothelial response to GCs in various inflammatory diseases ranging from multiple sclerosis, stroke, sepsis, and vasculitis to atherosclerosis. Shedding more light on the cross talk between GCs and endothelium will help to improve existing therapeutic strategies and develop new therapies better tailored to the needs of patients.
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Affiliation(s)
- Karolina A. Zielińska
- Laboratory of Immunobiology, Rega Institute for Medical Research, KU Leuven, Leuven, Belgium
| | - Laura Van Moortel
- Receptor Research Laboratories, Nuclear Receptor Lab, VIB-UGent, VIB Medical Biotechnology Center, Ghent, Belgium
| | - Ghislain Opdenakker
- Laboratory of Immunobiology, Rega Institute for Medical Research, KU Leuven, Leuven, Belgium
| | - Karolien De Bosscher
- Receptor Research Laboratories, Nuclear Receptor Lab, VIB-UGent, VIB Medical Biotechnology Center, Ghent, Belgium
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Long R, You Y, Li W, Jin N, Huang S, Li T, Liu K, Wang Z. Sodium tanshinone IIA sulfonate ameliorates experimental coronary no-reflow phenomenon through down-regulation of FGL2. Life Sci 2015; 142:8-18. [PMID: 26482204 DOI: 10.1016/j.lfs.2015.10.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 10/03/2015] [Accepted: 10/15/2015] [Indexed: 02/06/2023]
Abstract
AIMS The effects of sodium tanshinone IIA sulfonate (STS) on coronary no-reflow (CNR) relevant to microvascular obstruction (MVO) remain unknown. Studies had shown that fibrinogen-like protein 2 (FGL2) expressed in microvascular endothelial cells (MECs) is a key mediator in MVO. Thus, we aimed to elucidate the roles of STS in CNR and relations between STS and FGL2. MAIN METHODS Myocardial ischemia/reperfusion was selected to represent CNR model. The no-reflow zone and infarct area were assessed using Thioflavin S and TTC staining, and cardiac functional parameters were detected using echocardiography. Western blot was used to detected FGL2 level, fibrin level, protease-activated receptor-1 (PAR-1) activation and inflammation cells infiltration. FGL2 and inflammation cells were also identified by IHC. Microthrombus was detected by Carstairs' and MSB staining. We also detected the roles of STS on FGL2 expression, thrombin generation, phospho-Akt and NF-κB levels in MECs. KEY FINDINGS Upon treatment with STS in CNR model, the no-reflow and infarct areas decreased significantly and cardiac function improved. The FGL2 expression was inhibited by STS in vivo as well as in vitro with thrombin generation inhibition. In addition, STS up-regulates Akt phosphorylation and suppressed NF-κB expression in activated MECs. Furthermore, fibrin deposition, PAR-1 activation and inflammatory response were inhibited with STS administration in CNR model. SIGNIFICANCE Our results displayed a novel pharmacological action of STS on CNR. STS is able to ameliorate CNR through inhibition of FGL2 expression mediated by Akt and NF-κB pathways as well as prevention of MVO by suppressing fibrin deposition and inflammation.
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Affiliation(s)
- Rui Long
- Department of Geriatrics, Institute of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ya You
- Department of Geriatrics, Institute of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wenzhu Li
- Department of Geriatrics, Institute of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Nan Jin
- Department of Geriatrics, Institute of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shiyuan Huang
- Department of Geriatrics, Institute of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ting Li
- Department of Geriatrics, Institute of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kun Liu
- Department of Cardiology, Institute of Cardiovascular Disease, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Zhaohui Wang
- Department of Geriatrics, Institute of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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Jiang Y, Li Y, Ding Y, Dai X, Ma X, Bao L, Zhang Z, Li Y. Grape seed proanthocyanidin extracts prevent high glucose-induced endothelia dysfunction via PKC and NF-κB inhibition. Biosci Biotechnol Biochem 2015; 79:1493-503. [DOI: 10.1080/09168451.2014.991679] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Abstract
In our study, it has been detected in vivo and in vitro that GSPE reversed high glucose-induced the increase of ICAM-1 and VCAM-1. It is shown that by western blotting detection, GSPE significantly inhibited the activation of NF-κB induced by high glucose while there was significant decrease of the expression of PKC with GSPE intervention. By adding the NF-κB blocker PDTC and the PKC inhibitor peptide 19–31(10−6 M), no significant difference was found in the levels of VCAM-1 and ICAM-1 among GSPE group, the PKC inhibitor peptide 19–31-added GSPE group and the PDTC-added GSPE group. So the conclusion could be drawn that PKC inhibition must be involved in GSPE decreasing the level of ICAM-1 and VCAM-1.We proved for the first time that GSPE prevented high glucose-induced the increase of ICAM-1 and VCAM-1 by PKC and NF-κB inhibition. These findings show a novel mechanism of the action GSPE preventing endothelial dysfunction, which may have clinical application values.
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Affiliation(s)
- Yanfei Jiang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, China
| | - Yujie Li
- Center for Hygienic Assessment and Research, Institute of Disease Control and Prevention of PLA, Beijing, China
| | - Ye Ding
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, China
| | - Xiaoqian Dai
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, China
| | - Xiaotao Ma
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, China
| | - Lei Bao
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, China
| | - Zhaofeng Zhang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, China
| | - Yong Li
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, China
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Yang JB, Quan JH, Kim YE, Rhee YE, Kang BH, Choi IW, Cha GH, Yuk JM, Lee YH. Involvement of PI3K/AKT and MAPK Pathways for TNF-α Production in SiHa Cervical Mucosal Epithelial Cells Infected with Trichomonas vaginalis. THE KOREAN JOURNAL OF PARASITOLOGY 2015; 53:371-7. [PMID: 26323834 PMCID: PMC4566516 DOI: 10.3347/kjp.2015.53.4.371] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 07/29/2015] [Accepted: 07/30/2015] [Indexed: 12/31/2022]
Abstract
Trichomonas vaginalis; induces proinflammation in cervicovaginal mucosal epithelium. To investigate the signaling pathways in TNF-α production in cervical mucosal epithelium after T. vaginalis infection, the phosphorylation of PI3K/AKT and MAPK pathways were evaluated in T. vaginalis-infected SiHa cells in the presence and absence of specific inhibitors. T. vaginalis increased TNF-α production in SiHa cells, in a parasite burden-dependent and incubation time-dependent manner. In T. vaginalis-infected SiHa cells, AKT, ERK1/2, p38 MAPK, and JNK were phosphorylated from 1 hr after infection; however, the phosphorylation patterns were different from each other. After pretreatment with inhibitors of the PI3K/AKT and MAPK pathways, TNF-α production was significantly decreased compared to the control; however, TNF-α reduction patterns were different depending on the type of PI3K/MAPK inhibitors. TNF-α production was reduced in a dose-dependent manner by treatment with wortmannin and PD98059, whereas it was increased by SP600125. These data suggested that PI3K/AKT and MAPK signaling pathways are important in regulation of TNF-α production in cervical mucosal epithelial SiHa cells. However, activation patterns of each pathway were different from the types of PI3K/MAPK pathways.
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Affiliation(s)
- Jung-Bo Yang
- Department of Obstetrics and Gynecology, Chungnam National University School of Medicine, Daejeon 301-131, Korea
| | - Juan-Hua Quan
- Department of Gastroenterology, The Affiliated Hospital of Guangdong Medical College, Zhanjiang 524-001, Guangdong, China
| | - Ye-Eun Kim
- Department of Biomedical Science, Chungnam National University School of Medicine, Daejeon 301-131, Korea
| | - Yun-Ee Rhee
- Department of Obstetrics and Gynecology, Chungnam National University School of Medicine, Daejeon 301-131, Korea
| | - Byung-Hyun Kang
- Department of Obstetrics and Gynecology, Chungnam National University School of Medicine, Daejeon 301-131, Korea
| | - In-Wook Choi
- Department of Infection Biology, Chungnam National University School of Medicine, Daejeon 301-131, Korea
| | - Guang-Ho Cha
- Department of Infection Biology, Chungnam National University School of Medicine, Daejeon 301-131, Korea
| | - Jae-Min Yuk
- Department of Infection Biology, Chungnam National University School of Medicine, Daejeon 301-131, Korea
| | - Young-Ha Lee
- Department of Infection Biology, Chungnam National University School of Medicine, Daejeon 301-131, Korea
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Carbone F, Montecucco F. Inflammation in arterial diseases. IUBMB Life 2015; 67:18-28. [PMID: 25631520 DOI: 10.1002/iub.1344] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 12/28/2014] [Indexed: 12/26/2022]
Affiliation(s)
- Federico Carbone
- First Clinic of Internal Medicine; Department of Internal Medicine; University of Genoa School of Medicine, IRCCS Azienda Ospedaliera Universitaria San Martino-IST Istituto Nazionale per la Ricerca sul Cancro; Genoa Italy
- Division of Cardiology; Foundation for Medical Researches; Department of Medical Specialties; University of Geneva; Geneva Switzerland
| | - Fabrizio Montecucco
- First Clinic of Internal Medicine; Department of Internal Medicine; University of Genoa School of Medicine, IRCCS Azienda Ospedaliera Universitaria San Martino-IST Istituto Nazionale per la Ricerca sul Cancro; Genoa Italy
- Division of Cardiology; Foundation for Medical Researches; Department of Medical Specialties; University of Geneva; Geneva Switzerland
- Division of Laboratory Medicine; Department of Genetics and Laboratory Medicine; Geneva University Hospitals; Geneva Switzerland
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Elevated levels of plasma TNF-α are associated with microvascular endothelial dysfunction in patients with sepsis through activating the NF-κB and p38 mitogen-activated protein kinase in endothelial cells. Shock 2014; 41:275-81. [PMID: 24430552 DOI: 10.1097/shk.0000000000000116] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Inflammatory responses can induce microvascular and endothelial dysfunction, which is associated with the development of sepsis. This study is aimed at examining the concentrations of plasma tissue factor (TF), von Willebrand factor (vWF), and tumor necrosis factor-α (TNF-α) in patients with sepsis and at determining how septic plasma (SP) regulates TF and vWF expression and p38 mitogen activated protein kinase (p38 MAPK)/nuclear factor-κB (NF-κB) pathways in human endothelial cells. The concentrations of plasma TF, vWF, and TNF-α in 22 septic patients and eight healthy controls (HCs) were examined by enzyme-linked immunosorbent assay, and their potential association with disease severity was analyzed. Human umbilical vein endothelial cells (HUVECs) were treated with SP from patients or normal plasma (NP) from the HCs, and the levels of TF and vWF were measured. The SP-induced ERK, p38 MAPK, and NF-κB activation was characterized by Western blot and immunofluorescent assays. The SP-induced HUVEC apoptosis was detected by flow cytometry. The concentrations of plasma TF, vWF, and TNF-α in the patients were significantly higher than that in the HCs and were positively correlated with the Acute Physiology and Chronic Health Evaluation II scores in the patients. Furthermore, treatment with SP, but not NP, induced TF and vWF production in HUVECs in a dose- and time-dependent manner, which was associated with sequential activation of the p38 MAPK and NF-κB pathways. Septic plasma induced HUVEC apoptosis, which was inhibited by activating the NF-κB pathway. The sepsis-related inflammatory factors promoted endothelial cell activation, dysfunction, and apoptosis through activation of the p38 MAPK pathway that was regulated by NF-κB signaling.
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Zhang J, Patel MB, Griffiths R, Mao A, Song YS, Karlovich NS, Sparks MA, Jin H, Wu M, Lin EE, Crowley SD. Tumor necrosis factor-α produced in the kidney contributes to angiotensin II-dependent hypertension. Hypertension 2014; 64:1275-81. [PMID: 25185128 DOI: 10.1161/hypertensionaha.114.03863] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Immune system activation contributes to the pathogenesis of hypertension and the resulting progression of chronic kidney disease. In this regard, we recently identified a role for proinflammatory Th1 T-lymphocyte responses in hypertensive kidney injury. Because Th1 cells generate interferon-γ and tumor necrosis factor-α (TNF-α), we hypothesized that interferon-γ and TNF-α propagate renal damage during hypertension induced by activation of the renin-angiotensin system. Therefore, after confirming that mice genetically deficient of Th1 immunity were protected from kidney glomerular injury despite a preserved hypertensive response, we subjected mice lacking interferon-γ or TNF-α to our model of hypertensive chronic kidney disease. Interferon deficiency had no impact on blood pressure elevation or urinary albumin excretion during chronic angiotensin II infusion. By contrast, TNF-deficient (knockout) mice had blunted hypertensive responses and reduced end-organ damage in our model. As angiotensin II-infused TNF knockout mice had exaggerated endothelial nitric oxide synthase expression in the kidney and enhanced nitric oxide bioavailability, we examined the actions of TNF-α generated from renal parenchymal cells in hypertension by transplanting wild-type or TNF knockout kidneys into wild-type recipients before the induction of hypertension. Transplant recipients lacking TNF solely in the kidney had blunted hypertensive responses to angiotensin II and augmented renal endothelial nitric oxide synthase expression, confirming a role for kidney-derived TNF-α to promote angiotensin II-induced blood pressure elevation by limiting renal nitric oxide generation.
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Affiliation(s)
- Jiandong Zhang
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Mehul B Patel
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Robert Griffiths
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Alice Mao
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Young-soo Song
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Norah S Karlovich
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Matthew A Sparks
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Huixia Jin
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Min Wu
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Eugene E Lin
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.)
| | - Steven D Crowley
- From the Division of Nephrology, Department of Medicine, Duke University and Durham VA Medical Centers, NC (J.Z., M.B.P., R.G., A.M., Y.-s.S., N.S.K., M.S., H.J., S.D.C.); Department of Biology, University of Virginia, Charlottesville (E.E.L.); and Department of Medicine, Southeast University, Nanjing, China (M.W.).
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Jia P, Wang J, Wang L, Chen X, Chen Y, Li WZ, Long R, Chen J, Shu YW, Liu K, Wang ZH. TNF-α upregulates Fgl2 expression in rat myocardial ischemia/reperfusion injury. Microcirculation 2014; 20:524-33. [PMID: 23432784 DOI: 10.1111/micc.12050] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Accepted: 02/18/2013] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Proinflammatory cytokine TNF-α during MI/R injury has been studied extensively. However, how TNF-α induces microvascular dysfunction in MI/R is still unclear. This study investigates whether TNF-α regulates fibrinogen-like protein 2 (fgl2) expression, a procoagulant resulting in the formation of fibrin-rich microthrombus in MI/R injury. METHODS AND RESULTS Microthrombosis, TNF-α and fgl2 expression were assessed in rats with MI/R injury. The effect of TNF-α on fgl2 expression and fgl2 prothrombinase activity was investigated in CMECs, then CMECs were pretreated with selective inhibitors of NF-κB and p38 MAPK pathways. TNF-α and fgl2 expression were both upregulated in MI/R group. When neutralization of TNF-α, fgl2 expression was decreased in vivo. Fgl2 expression was upregulated in CMECs exposed to TNF-α. Accordingly, the ability of thrombin generation was increased in CMECs. Besides, TNF-α-induced fgl2 expression in the cells was suppressed by NF-κB inhibitor PDTC and/or p38 MAPK inhibitor SB203580. CONCLUSION TNF-α upregulates fgl2 expression via activation of NF-kB and p38 MAPK in CMECs. TNF-α-induced flg2 in CMECs mediates the formation of fibrin-rich microthrombus, which may be one of the mechanisms of microvascular dysfunction or obstruction due to MI/R injury.
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Affiliation(s)
- Peng Jia
- Department of Cardiology, Institute of Cardiovascular Disease, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Zelová H, Hošek J. TNF-α signalling and inflammation: interactions between old acquaintances. Inflamm Res 2013; 62:641-51. [PMID: 23685857 DOI: 10.1007/s00011-013-0633-0] [Citation(s) in RCA: 512] [Impact Index Per Article: 46.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 03/03/2013] [Accepted: 05/06/2013] [Indexed: 12/14/2022] Open
Abstract
INTRODUCTION Inflammation is a very important part of innate immunity and is regulated in many steps. One such regulating step is the cytokine network, where tumor necrosis factor α (TNF-α) plays one of the most important roles. METHODS A PubMed and Web of Science databases search was performed for studies providing evidences on the role of TNF-α in inflammation, apoptosis, and cancer. RESULTS AND CONCLUSION This review concisely summarizes the role of this pro-inflammatory cytokine during inflammation. It is focused mainly on TNF-α intracellular signaling and its influence on the typical inflammatory features in the organism. Being one of the most important pro-inflammatory cytokines, TNF-α participates in vasodilatation and edema formation, and leukocyte adhesion to epithelium through expression of adhesion molecules; it regulates blood coagulation, contributes to oxidative stress in sites of inflammation, and indirectly induces fever. The connection between TNF-α and cancer is mentioned as well.
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Affiliation(s)
- Hana Zelová
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackého tř. 1/3, 612 42 Brno, Czech Republic
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Dong M, Hu N, Hua Y, Xu X, Kandadi MR, Guo R, Jiang S, Nair S, Hu D, Ren J. Chronic Akt activation attenuated lipopolysaccharide-induced cardiac dysfunction via Akt/GSK3β-dependent inhibition of apoptosis and ER stress. Biochim Biophys Acta Mol Basis Dis 2013; 1832:848-63. [PMID: 23474308 DOI: 10.1016/j.bbadis.2013.02.023] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 02/26/2013] [Accepted: 02/27/2013] [Indexed: 02/03/2023]
Abstract
Sepsis is characterized by systematic inflammation and contributes to cardiac dysfunction. This study was designed to examine the effect of protein kinase B (Akt) activation on lipopolysaccharide-induced cardiac anomalies and underlying mechanism(s) involved. Mechanical and intracellular Ca²⁺ properties were examined in myocardium from wild-type and transgenic mice with cardiac-specific chronic Akt overexpression following LPS (4 mg/kg, i.p.) challenge. Akt signaling cascade (Akt, phosphatase and tensin homologue deleted on chromosome ten, glycogen synthase kinase 3 beta), stress signal (extracellular-signal-regulated kinases, c-Jun N-terminal kinases, p38), apoptotic markers (Bcl-2 associated X protein, caspase-3/-9), endoplasmic reticulum (ER) stress markers (glucose-regulated protein 78, growth arrest and DNA damage induced gene-153, eukaryotic initiation factor 2α), inflammatory markers (tumor necrosis factor α, interleukin-1β, interleukin-6) and autophagic markers (Beclin-1, light chain 3B, autophagy-related gene 7 and sequestosome 1) were evaluated. Our results revealed that LPS induced marked decrease in ejection fraction, fractional shortening, cardiomyocyte contractile capacity with dampened intracellular Ca²⁺ release and clearance, elevated reactive oxygen species (ROS) generation and decreased glutathione and glutathione disulfide (GSH/GSSG) ratio, increased ERK, JNK, p38, GRP78, Gadd153, eIF2α, BAX, caspase-3 and -9, downregulated B cell lymphoma 2 (Bcl-2), the effects of which were significantly attenuated or obliterated by Akt activation. Akt activation itself did not affect cardiac contractile and intracellular Ca²⁺ properties, ROS production, oxidative stress, apoptosis and ER stress. In addition, LPS upregulated levels of Beclin-1, LC3B and Atg7, while suppressing p62 accumulation. Akt activation did not affect Beclin-1, LC3B, Atg7 and p62 in the presence or absence of LPS. Akt overexpression promoted phosphorylation of Akt and GSK3β. In vitro study using the GSK3β inhibitor SB216763 mimicked the response elicited by chronic Akt activation. Taken together, these data showed that Akt activation ameliorated LPS-induced cardiac contractile and intracellular Ca²⁺ anomalies through inhibition of apoptosis and ER stress, possibly involving an Akt/GSK3β-dependent mechanism.
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Affiliation(s)
- Maolong Dong
- Department of Burn and Cutaneous Surgery, Xijing Hospital, the Fourth Military Medical University, Xi'an 710032, PR China
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4F, apolipoprotein AI mimetic peptide, attenuates acute lung injury and improves survival in endotoxemic rats. J Trauma Acute Care Surg 2012; 72:1576-83. [PMID: 22695425 DOI: 10.1097/ta.0b013e3182493ab4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND 4F, apolipoprotein AI mimetic peptide, mimics anti-inflammatory properties of high-density lipoprotein (HDL). The aim of this study was to investigate whether 4F attenuates acute lung injury and improves survival in endotoxemic rats and to determine whether the therapeutic benefits of 4F are associated with the stimulation of sphingosine-1-phosphate receptor 1 (S1P1), the activation of Akt, the down-regulation of the nuclear factor-κB (NF-κB) pathway, and the suppression of cell adhesion molecules. METHODS To induce endotoxemia in rats, lipopolysaccharide (LPS, 10 mg/kg) was injected into a tail vein and 10 minutes later, vehicle or 4F (10 mg/kg) was administered intraperitoneally, respectively. We observed the survival of subjects for 72 hours. At 6-hour post-LPS, we killed animals and measured S1P1 expression, phosphorylated Akt/Akt ratio, cytoplasmic phosphorylated inhibitor κB-α/inhibitor κB-α ratio, nuclear NF-κB p65 expression and DNA-binding activity, endothelial leukocyte adhesion molecule-1 (E-selectin) and intercellular adhesion molecule-1 expression, myeloperoxidase activity, and histologic damages in lung tissues. We also measured serum HDL cholesterol level. RESULTS 4F improved survival in endotoxemic rats. 4F restored LPS-induced diminution of serum HDL cholesterol level and increased lung S1P1 expression and phosphorylated Akt/Akt ratio in LPS-treated rats. Furthermore, 4F suppressed inhibitor κB-α degradation, NF-κB activation, E-selectin and intercellular adhesion molecule-1 expression, and myeloperoxidase activity, and attenuated histologic damages in lung tissues. CONCLUSIONS 4F attenuated acute lung injury and improved survival in endotoxemic rats. The therapeutic benefits of 4F were found to be associated with the stimulation of S1P1, the activation of Akt, the down-regulation of the NF-κB pathway, and the suppression of cell adhesion molecules.
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ROS-induced ZNF580 expression: a key role for H2O2/NF-κB signaling pathway in vascular endothelial inflammation. Mol Cell Biochem 2011; 359:183-91. [PMID: 21830064 DOI: 10.1007/s11010-011-1013-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 07/27/2011] [Indexed: 01/14/2023]
Abstract
ZNF580, a newly found C2H2 zinc finger transcription factor, was first described by Zhang (GenBank ID: AF184939). Emerging evidence has suggested that reactive oxygen species (ROS) play an important role in redox-sensitive signal transduction, and the vascular endothelium plays a critical role in the vascular inflammatory response. In this communication, we present evidence for the potential role of ZNF580 in hydrogen peroxide (H2O2)-regulated inflammation-related signaling pathways. In a human endothelial cell hybridoma line (EA.hy926), ZNF580 levels were markedly upregulated with H2O2 stimulation in different concentrations (0-400 μM) and at different time-points (0-6 h). H2O2 promoted the rapid translocation of p65 from the cytoplasm into the nucleus according to immunocytochemistry staining. In subsequent research, inhibition of NF-κB by pyrrolidine dithiocarbamate (PDTC, a selective chemical inhibitor of NF-κB) was shown to block the upregulated expression of ZNF580 that was induced by H2O2. Furthermore, transient transfection of ZNF580 resulted in an increase of the pro-inflammatory cytokine interleukin-8 (IL-8) 3.01±0.05 folds according to real-time RT-PCR and ELISA assays, which also showed significantly enhanced motility of human acute monocytic leukemia cells (THP-1). These results suggest that H2O2 upregulates the expression of ZNF580 via the NF-κB signaling pathway, and overexpression of ZNF580 plays a critical role in augmenting the release of pro-inflammatory cytokine IL-8.
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Koh G, Lee DY. Mathematical modeling and sensitivity analysis of the integrated TNFα-mediated apoptotic pathway for identifying key regulators. Comput Biol Med 2011; 41:512-28. [PMID: 21632045 DOI: 10.1016/j.compbiomed.2011.04.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Revised: 03/30/2011] [Accepted: 04/28/2011] [Indexed: 12/20/2022]
Abstract
TNFα-mediated apoptosis is one of the complex and tightly regulated cellular processes as it involves the activation of both pro- and anti-apoptotic signaling pathways. Thus, it is important to elucidate the molecular players of this process and their dynamics in order to gain an in-depth understanding of the mechanisms underlying apoptosis. To this end, we proposed an integrated model of TNFα-mediated apoptosis pathway in Type I cells, formulated based on the principles of mass action kinetics. The model includes major apoptotic modules-the extrinsic and intrinsic pathways, the NFκB survival signaling and various regulatory mechanisms. We performed simulations and sensitivity analyses to study the role of NFκB pathway in regulating apoptosis, and identified IAP as one of the more potent regulators of apoptosis.
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Affiliation(s)
- Geoffrey Koh
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01, Centros, Singapore 138668, Singapore.
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Abstract
Phosphoinositide-3 kinases (PI3Ks) are critical regulatory proteins in the immunologic defense system against sepsis. The PI3K mechanism helps modulate cellular survival, innate and adaptive immunities, inflammation, nuclear factor-κB transcription, and may, in turn, play a protective role in sepsis. Animal studies confirm its role in the prevention of organ dysfunction and improvement of survival outcomes. Further advances in the understanding of this key immunomodulatory pathway may provide valuable insights into the manipulation of cellular function for therapeutic treatment of sepsis and other inflammatory diseases.
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Wang H, Zhang M, Wang X, Mao H, Ying X, Zhu W, Sun C, Jiang C. Improvement of cytokine response and survival time by bioartificial kidney therapy in acute uremic pigs with multi-organ dysfunction. Int J Artif Organs 2011; 33:526-34. [PMID: 20872347 DOI: 10.1177/039139881003300803] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/20/2010] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To explore whether bioartificial kidney (BAK) ameliorates cytokine response and biochemical indices, and prolongs the survival time in acute uremic pigs with multiple organ dysfunction syndrome (MODS). METHODS Hybridized pigs suffering from MODS and acute renal failure (ARF) were treated with BAK (Group A, n=6) or sham-BAK containing no cells (Group B, n=6), or received no treatment (Group C, n=5). Data on blood pressure, hepatic and renal function, IL-10, TNF-α, arterial blood gas, and survival time of all the pigs was recorded. RESULTS Mean arterial pressure (MAP, mmHg) responded more rapidly and reached higher values in Group A (91.82 ± 5.73) compared with Groups B and C at 24 hours (p<0.01). The peak level of serum IL-10 (pg/mL) in Group A (249.57 ± 43.51) was significantly higher than in Groups B and C (132.06 ± 17.53, 104.25 ± 13.42, p<0.01). Serum TNF-α level (pg/mL) in Group A dropped gradually to 402.91 ± 32.47 at 24 hours, and showed a significant discrepancy compared with those before treatment (537.16 ± 38.45) and Group B (512.94 ± 19.5, p<0.05). There was no difference in plasma endotoxin and serum IL-6 between pre-treatment and post-treatment in Groups A and B. BAK treatment, however, resulted in a significant decline in IL-6/IL-10 ratios. The average survival time (hours) in Group A (113.01 ± 14.32) was significantly longer, prolonged by 35.93% and 63.90% compared to Groups B and C (p<0.01), respectively. CONCLUSIONS The addition of renal tubule cell therapy to hemofiltration in an acutely uremic animal model with MODS altered systemic cytokine balance, ameliorated MAP, and prolonged survival time.
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Affiliation(s)
- Hengjin Wang
- Department of Nephrology, Drum Tower Hospital, Nanjing University School of Medicine, Nanjing, China
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Xu S, Zhao Y, Yu L, Shen X, Ding F, Fu G. Rosiglitazone Attenuates Endothelial Progenitor Cell Apoptosis Induced by TNF-α via ERK/MAPK and NF-κB Signal Pathways. J Pharmacol Sci 2011; 117:265-74. [DOI: 10.1254/jphs.11149fp] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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KSR1 is a functional protein kinase capable of serine autophosphorylation and direct phosphorylation of MEK1. Exp Cell Res 2010; 317:452-63. [PMID: 21144847 DOI: 10.1016/j.yexcr.2010.11.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 11/29/2010] [Accepted: 11/29/2010] [Indexed: 11/20/2022]
Abstract
The extracellular signal-regulated kinase/mitogen-activated protein kinase (ERK/MAPK) pathway is a highly conserved signaling pathway that regulates diverse cellular processes including differentiation, proliferation, and survival. Kinase suppressor of Ras-1 (KSR1) binds each of the three ERK cascade components to facilitate pathway activation. Even though KSR1 contains a C-terminal kinase domain, evidence supporting the catalytic function of KSR1 remains controversial. In this study, we produced recombinant wild-type or kinase-inactive (D683A/D700A) KSR1 proteins in Escherichia coli to test the hypothesis that KSR1 is a functional protein kinase. Recombinant wild-type KSR1, but not recombinant kinase-inactive KSR1, underwent autophosphorylation on serine residue(s), phosphorylated myelin basic protein (MBP) as a generic substrate, and phosphorylated recombinant kinase-inactive MAPK/ERK kinase-1 (MEK1). Furthermore, FLAG immunoprecipitates from KSR1(-/-) colon epithelial cells stably expressing FLAG-tagged wild-type KSR1 (+KSR1), but not vector (+vector) or FLAG-tagged kinase-inactive KSR1 (+D683A/D700A), were able to phosphorylate kinase-inactive MEK1. Since TNF activates the ERK pathway in colon epithelial cells, we tested the biological effects of KSR1 in the survival response downstream of TNF. We found that +vector and +D683A/D700A cells underwent apoptosis when treated with TNF, whereas +KSR1 cells were resistant. However, +KSR1 cells were sensitized to TNF-induced cell loss in the absence of MEK kinase activity. These data provide clear evidence that KSR1 is a functional protein kinase, MEK1 is an in vitro substrate of KSR1, and the catalytic activities of both proteins are required for eliciting cell survival responses downstream of TNF.
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Oxidative stress and inflammatory mediators contribute to endothelial dysfunction in high-fat diet-induced obesity in mice. J Hypertens 2010; 28:2111-9. [DOI: 10.1097/hjh.0b013e32833ca68c] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Chang HN, Pang JHS, Yang SH, Hung CF, Chiang CH, Lin TY, Lin YK. Inhibitory effect of indigo naturalis on tumor necrosis factor-α-induced vascular cell adhesion molecule-1 expression in human umbilical vein endothelial cells. Molecules 2010; 15:6423-35. [PMID: 20877233 PMCID: PMC6257747 DOI: 10.3390/molecules15096423] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 09/08/2010] [Accepted: 09/09/2010] [Indexed: 01/21/2023] Open
Abstract
The use of indigo naturalis to treat psoriasis has proved effective in our previous clinical studies. The present study was designed to examine the anti-inflammatory effect of indigo naturalis in primary cultured human umbilical vein endothelial cells (HUVECs). Pretreatment of cells with indigo naturalis extract attenuated TNF-α-induced increase in Jurkat T cell adhesion to HUVECs as well as decreased the protein and messenger (m)RNA expression levels of vascular cell adhesion molecule-1 (VCAM-1) on HUVECs. Indigo naturalis extract also inhibited the protein expression of activator protein-1 (AP-1)/c-Jun, a critical transcription factor for the activation of VCAM-1 gene expression. Since the reduction of lymphocyte adhesion to vascular cells by indigo naturalis extract could subsequently reduce the inflammatory reactions caused by lymphocyte infiltration in the epidermal layer and help to improve psoriasis, this study provides a potential mechanism for the anti-inflammatory therapeutic effect of indigo naturalis extract in psoriasis.
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Affiliation(s)
- Hsin-Ning Chang
- Department of Traditional Chinese Medicine, Chang Gung Memorial Hospital, 222 Mai Chin Road, Keelung 204, Taiwan; E-Mail: (H.N.C.); dryang@ adm.cgmh.org.tw (S.H.Y.); (T.Y.L.)
- College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kweishan, Taoyuan 333, Taiwan; E-Mail: (J.H.S.P.)
| | - Jong-Hwei Su Pang
- College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kweishan, Taoyuan 333, Taiwan; E-Mail: (J.H.S.P.)
| | - Sien-Hung Yang
- Department of Traditional Chinese Medicine, Chang Gung Memorial Hospital, 222 Mai Chin Road, Keelung 204, Taiwan; E-Mail: (H.N.C.); dryang@ adm.cgmh.org.tw (S.H.Y.); (T.Y.L.)
- College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kweishan, Taoyuan 333, Taiwan; E-Mail: (J.H.S.P.)
| | - Chi-Feng Hung
- School of Medicine, Fu Jen Catholic University; Taipei County 242, Taiwan; E-Mail:
| | - Chi-Hsin Chiang
- College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kweishan, Taoyuan 333, Taiwan; E-Mail: (J.H.S.P.)
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Keelung, 204, Taiwan; E-Mail:
| | - Tung-Yi Lin
- Department of Traditional Chinese Medicine, Chang Gung Memorial Hospital, 222 Mai Chin Road, Keelung 204, Taiwan; E-Mail: (H.N.C.); dryang@ adm.cgmh.org.tw (S.H.Y.); (T.Y.L.)
- College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kweishan, Taoyuan 333, Taiwan; E-Mail: (J.H.S.P.)
| | - Yin-Ku Lin
- Department of Traditional Chinese Medicine, Chang Gung Memorial Hospital, 222 Mai Chin Road, Keelung 204, Taiwan; E-Mail: (H.N.C.); dryang@ adm.cgmh.org.tw (S.H.Y.); (T.Y.L.)
- College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kweishan, Taoyuan 333, Taiwan; E-Mail: (J.H.S.P.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +886-2-243-13-131 ext. 2777; Fax: 886-2-254-62-083
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5′-Nitro-indirubinoxime inhibits inflammatory response in TNF-α stimulated human umbilical vein endothelial cells. Atherosclerosis 2010; 211:77-83. [DOI: 10.1016/j.atherosclerosis.2010.01.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2008] [Revised: 01/21/2010] [Accepted: 01/27/2010] [Indexed: 01/28/2023]
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Liu J, Agarwal S. Mechanical signals activate vascular endothelial growth factor receptor-2 to upregulate endothelial cell proliferation during inflammation. THE JOURNAL OF IMMUNOLOGY 2010; 185:1215-21. [PMID: 20548028 DOI: 10.4049/jimmunol.0903660] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Signals generated by the dynamic mechanical strain critically regulate endothelial cell proliferation and angiogenesis; however, the molecular basis remains unclear. We investigated the mechanisms by which human dermal microvascular endothelial cells (HDMECs) perceive mechanical signals and relay them intracellularly to regulate gene expression and endothelial cell proliferation. HDMECs were exposed to low/physiologic levels of dynamic strain and probed for the differential activation/inhibition of kinases in the mechanosignaling cascade associated with endothelial cell gene activation. Because angiogenesis is important at inflammatory sites, we also assessed the mechanisms of mechanosignaling in the presence of an proinflammatory cytokine IL-1beta. In this article, we demonstrate that the mechanosignaling cascade is initiated by vascular endothelial growth receptor-2 (VEGFR2) activation. Mechanoactivation of VEGFR2 results in its nuclear translocation and elevation of PI3K-dependent Ser473-Akt phosphorylation. Subsequently, activated Akt inactivates the kinase activity of the serine/threonine kinase, glycogen synthase kinase-3beta (GSK3beta), via its Ser9 phosphorylation. Thus, inactive GSK3beta fails to phosphorylate cyclin D1 and prevents its proteosomal degradation and, consequently, promotes endothelial cell survival and proliferation. In the presence of IL-1beta, cyclin D1 is phosphorylated and degraded, leading to inhibition of cell proliferation. However, mechanical signals repress cyclin D1 phosphorylation and upregulate cell proliferation, despite the presence of IL-1beta. The data indicate that the VEGFR2/Akt/GSK3beta signaling cascade plays a critical role in sensing and phospho-relaying mechanical stimuli in endothelial cells. Furthermore, mechanical forces control highly interconnected networks of proinflammatory and Akt signaling cascades to upregulate endothelial cell proliferation.
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Affiliation(s)
- Jie Liu
- Biomechanics and Tissue Engineering Laboratory, Division of Oral Biology, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
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Fu BD, Yamawaki H, Okada M, Hara Y. Vaspin can not inhibit TNF-alpha-induced inflammation of human umbilical vein endothelial cells. J Vet Med Sci 2009; 71:1201-7. [PMID: 19801900 DOI: 10.1292/jvms.71.1201] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Visceral adipose tissue-derived serine protease inhibitor (vaspin) has been recently identified as an adipocytokine in a rat model of type 2 diabetes. Adipocytokines may directly influence the function of endothelial cells (ECs) and modulate inflammatory states. We therefore assessed the effects of vaspin on basal and TNF-alpha-stimulated human umbilical vein ECs. Vaspin (10-100 ng/ml, 24 hr) had no effects on both basal ECs morphology and TNF-alpha-induced (10 ng/ml, 24 hr) morphological damages. Vaspin did not inhibit the TNF-alpha (20 min) activation of JNK, p38 and NF-kappaB, but only slightly inhibited Akt. Furthermore, vaspin did not decrease the TNF-alpha (24 hr) induction of vascular cell adhesion molecule-1, intercellular adhesion molecule-1, endothelial selectin, and cyclooxygenase-2 protein expression as well as monocyte chemotactic protein-1, tissue factor, and plasmogen activator inhibitor-1 mRNA expression. The present results indicate that vaspin has no effects on normal ECs, and can not prevent TNF-alpha-induced inflammatory injury.
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Affiliation(s)
- Ben-Dong Fu
- Department of Veterinary Pharmacology, School of Veterinary Medicine, Kitasato University, Aomori, Japan
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Abstract
The use of statins is widespread and many patients presenting for surgery are regularly taking them. There is evidence that statins have beneficial effects beyond those of lipid lowering, including reducing the perioperative risk of cardiac complications and sepsis. This review addresses the cellular mechanisms by which statins may produce these effects. Statins appear to have actions on vascular nitric oxide through the balance of inducible and endothelial nitric oxide synthase. The clinical evidence for these benefits is also briefly reviewed with the objective of clarifying the current status of statin use in the perioperative period. There is reasonably strong evidence that patients already taking statins should continue on them perioperatively. However, the evidence for the prophylactic use of statins perioperatively is weak and lacks prospective controlled studies.
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Affiliation(s)
- Z L S Brookes
- Microcirculation Research Group, School of Medicine and Biomedical Sciences, Royal Hallamshire Hospital, University of Sheffield, K Floor, Beech Hill Road, Sheffield, UK
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Zhang Y, Herbert BS, Rajashekhar G, Ingram DA, Yoder MC, Clauss M, Rehman J. Premature senescence of highly proliferative endothelial progenitor cells is induced by tumor necrosis factor-alpha via the p38 mitogen-activated protein kinase pathway. FASEB J 2009; 23:1358-65. [PMID: 19124561 PMCID: PMC2669419 DOI: 10.1096/fj.08-110296] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Accepted: 12/04/2008] [Indexed: 01/13/2023]
Abstract
Senescence of endothelial cells increases with systemic aging and is thought to contribute to the development of atherosclerosis. Cell therapy with highly proliferative endothelial progenitor cells (EPCs) is an emerging therapeutic option to promote endothelial regeneration, but little is known about their senescence and their vulnerability to inflammatory stressors. We therefore studied the senescence of proliferative human EPCs and investigated the effects of the proinflammatory cytokine tumor necrosis factor-alpha (TNF-alpha) on their senescence. Human EPCs had a significantly lower rate of senescence at baseline, compared with that of mature endothelial cells. However, EPCs up-regulated the expression of the senescence-associated cell cycle arrest protein p16(INK4a) and markedly increased measured senescence levels when exposed to chronic TNF-alpha treatment. Analysis of telomere length showed that the increases in senescence were not related to changes in telomere length. Inhibition of the p38 mitogen-activated protein kinase pathway blocked the induction of p16(INK4a) and cellular senescence. In conclusion, highly proliferative EPCs have a low rate of intrinsic senescence but are vulnerable to premature senescence induction by chronic proinflammatory stimulation. These findings will lead to a better understanding of physiological endothelial regeneration as well as to targeted therapies with the aim of promoting endothelial regeneration through endothelial progenitor cells.
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Affiliation(s)
- Yanmin Zhang
- Section of Cardiology, University of Chicago, Pritzker School of Medicine, 5841 S. Maryland Ave., Mail-Code 6080, Chicago, IL 60637, USA
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Curran CR, Miller N. The impact of corporate culture on nurse retention. J Transl Med 1990; 9:176. [PMID: 21999347 PMCID: PMC3223503 DOI: 10.1186/1479-5876-9-176] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Accepted: 10/14/2011] [Indexed: 01/11/2023] Open
Abstract
Background Fenofibrate, a PPAR alpha agonist, has been widely used in clinics as lipid-regulating agent. PPAR alpha is known to be expressed in many organs including pancreatic beta cells and regulate genes involved in fatty acid metabolism. Some reports based on cell lines or animals have provided evidences that PPAR alpha agonists may affect (increased or suppressed) beta cell insulin secretion, and several studies are producing interesting but still debated results. Methods In this research, we investigated the long term effects of fenofibrate on beta cell function in a metabolic syndrome animal model, monosodium glutamate (MSG) induced obese rats. Obese MSG rats were administered by gavage with fenofibrate at a dose of 100 mg/kg for 12 weeks. Oral glucose tolerance and insulin tolerance tests were performed to evaluate glucose metabolism and insulin sensitivity. We have used the hyperglycemic clamp technique to evaluate the capacity of beta cell insulin secretion. This technique provides an unbiased approach to understand the beta cell function in vivo. The changes of gene and protein expression in the pancreas and islets were also analyzed by Real-Time-PCR, Western blot and immunostaining. Results Fenofibrate reduced the plasma lipid levels within a few days, and showed no beneficial effects on glucose homeostasis or insulin sensitivity in obese MSG rats. But the animals treated with fenofibrate exhibited significantly decreased fasting plasma insulin and impaired insulin secretory response to glucose stimulation. Further studies confirmed that fenofibrate increased MDA level and decreased total ATPase activity in pancreatic mitochondrion, accompanied by the upregulation of iNOS and NF-kappa B and TNF alpha expression in pancreatic islets of obese MSG rats. Conclusions Long-term fenofibrate treatment disrupted beta cell function, and impaired glucose-stimulated insulin secretion in obese MSG rats, perhaps to some extent associated with the activated inflammatory pathway and increased formation of oxidative products, especially the up-regulation of NF-kappa B and iNOS expression in islets.
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