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Kholodenko IV, Gisina AM, Manukyan GV, Majouga AG, Svirshchevskaya EV, Kholodenko RV, Yarygin KN. Resistance of Human Liver Mesenchymal Stem Cells to FAS-Induced Cell Death. Curr Issues Mol Biol 2022; 44:3428-3443. [PMID: 36005132 PMCID: PMC9406952 DOI: 10.3390/cimb44080236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/26/2022] [Accepted: 07/28/2022] [Indexed: 11/05/2022] Open
Abstract
Mesenchymal stem cells (MSCs) have a pronounced therapeutic potential in various pathological conditions. Though therapeutic effects of MSC transplantation have been studied for a long time, the underlying mechanisms are still not clear. It has been shown that transplanted MSCs are rapidly eliminated, presumably by apoptosis. As the mechanisms of MSC apoptosis are not fully understood, in the present work we analyzed MSC sensitivity to Fas-induced apoptosis using MSCs isolated from the biopsies of liver fibrosis patients (L-MSCs). The level of cell death was analyzed by flow cytometry in the propidium iodide test. The luminescent ATP assay was used to measure cellular ATP levels; and the mitochondrial membrane potential was assessed using the potential-dependent dye JC-1. We found that human L-MSCs were resistant to Fas-induced cell death over a wide range of FasL and anti-Fas mAb concentrations. At the same time, intrinsic death signal inducers CoCl2 and staurosporine caused apoptosis of L-MSCs in a dose-dependent manner. Despite the absence of Fas-induced cell death treatment of L-MSCs with low concentrations of FasL or anti-Fas mAb resulted in a cellular ATP level decrease, while high concentrations of the inducers caused a decline of the mitochondrial membrane potential. Pre-incubation of L-MSCs with the pro-inflammatory cytokine TNF-α did not promote L-MSC cell death. Our data indicate that human L-MSCs have increased resistance to receptor-mediated cell death even under inflammatory conditions.
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Affiliation(s)
- Irina V. Kholodenko
- Orekhovich Institute of Biomedical Chemistry, 119121 Moscow, Russia; (A.M.G.); (K.N.Y.)
- Correspondence: ; Tel.: +7-(905)7765062; Fax: +7-(499)2450857
| | - Alisa M. Gisina
- Orekhovich Institute of Biomedical Chemistry, 119121 Moscow, Russia; (A.M.G.); (K.N.Y.)
| | - Garik V. Manukyan
- Petrovsky Russian Research Center of Surgery, 119991 Moscow, Russia;
| | - Alexander G. Majouga
- Faculty of Chemical and Pharmaceutical Technologies and Biomedical Products, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia;
| | - Elena V. Svirshchevskaya
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia; (E.V.S.); (R.V.K.)
| | - Roman V. Kholodenko
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia; (E.V.S.); (R.V.K.)
| | - Konstantin N. Yarygin
- Orekhovich Institute of Biomedical Chemistry, 119121 Moscow, Russia; (A.M.G.); (K.N.Y.)
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2
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Analyzing the Systems Biology Effects of COVID-19 mRNA Vaccines to Assess Their Safety and Putative Side Effects. Pathogens 2022; 11:pathogens11070743. [PMID: 35889989 PMCID: PMC9320269 DOI: 10.3390/pathogens11070743] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/11/2022] [Accepted: 06/25/2022] [Indexed: 01/25/2023] Open
Abstract
COVID-19 vaccines have been instrumental tools in reducing the impact of SARS-CoV-2 infections around the world by preventing 80% to 90% of hospitalizations and deaths from reinfection, in addition to preventing 40% to 65% of symptomatic illnesses. However, the simultaneous large-scale vaccination of the global population will indubitably unveil heterogeneity in immune responses as well as in the propensity to developing post-vaccine adverse events, especially in vulnerable individuals. Herein, we applied a systems biology workflow, integrating vaccine transcriptional signatures with chemogenomics, to study the pharmacological effects of mRNA vaccines. First, we derived transcriptional signatures and predicted their biological effects using pathway enrichment and network approaches. Second, we queried the Connectivity Map (CMap) to prioritize adverse events hypotheses. Finally, we accepted higher-confidence hypotheses that have been predicted by independent approaches. Our results reveal that the mRNA-based BNT162b2 vaccine affects immune response pathways related to interferon and cytokine signaling, which should lead to vaccine success, but may also result in some adverse events. Our results emphasize the effects of BNT162b2 on calcium homeostasis, which could be contributing to some frequently encountered adverse events related to mRNA vaccines. Notably, cardiac side effects were signaled in the CMap query results. In summary, our approach has identified mechanisms underlying both the expected protective effects of vaccination as well as possible post-vaccine adverse effects. Our study illustrates the power of systems biology approaches in improving our understanding of the comprehensive biological response to vaccination against COVID-19.
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3
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Liu X, Ma H, Fei L, Jiang M, Xia M, Bai L, Pi X, Chen S, Yu L. HPV-mediated down-regulation of NOD1 inhibits apoptosis in cervical cancer. Infect Agent Cancer 2020; 15:6. [PMID: 32021648 PMCID: PMC6993450 DOI: 10.1186/s13027-020-0272-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Accepted: 01/12/2020] [Indexed: 12/12/2022] Open
Abstract
Cervical cancer is the fourth most common malignant tumor in women worldwide. The persistent infection of high-risk Human Papillomavirus (hrHPV) is considered to be the primary cause of this disease. As an innate immune receptor, the nucleotide-binding oligomerization domain protein-1 (NOD1) recognizes the pathogen-associated molecular pattern (PAMP), subsequently initiating immune responses. NOD1 is also involved in the apoptotic signaling pathway and mutates in many cancer cells. In the study, we revealed that NOD1 expression decreased during the progression of cervical intraepithelial neoplasia to cervical cancer and that HPV16 E6/E7 oncoproteins induced down-regulation of NOD1. Moreover, the activation of NOD1 promoted the apoptosis of HPV16-positive cervical cancer cells. The data indicated that the dysregulation of NOD1-mediated inflammation and apoptosis may contribute to cervical intraepithelial neoplasia progression and cervical cancer.
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Affiliation(s)
- Xubin Liu
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Hanyu Ma
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Lingyan Fei
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Mengjie Jiang
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Meng Xia
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Lihong Bai
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Xufang Pi
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Shangwu Chen
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Li Yu
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
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4
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Ginting TE, Christian S, Larasati YO, Suryatenggara J, Suriapranata IM, Mathew G. Antiviral interferons induced by Newcastle disease virus (NDV) drive a tumor-selective apoptosis. Sci Rep 2019; 9:15160. [PMID: 31641164 PMCID: PMC6806003 DOI: 10.1038/s41598-019-51465-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 10/01/2019] [Indexed: 01/06/2023] Open
Abstract
Newcastle disease virus (NDV) strongly induces both type I and III antiviral interferons (IFNs-α/-β and IFN-λ, respectively) in tumor cells while it induces mainly type III IFN in normal cells. Impairment of antiviral type I IFN signaling in tumor cells is thought to be the reason for effective oncolysis. However, there is lack of clarity why lentogenic strain NDV can also induce oncolysis. NDV infection caused apoptosis in normal and tumor cells as demonstrated with the caspase-3 enzyme activation and annexin-V detection. The apoptosis response was inhibited by B18R protein (a type I IFN inhibitor) in tumor cells i.e. A549 and U87MG, and not in normal cells i.e. NB1RGB and HEK293. Similarly, UV-inactivated medium from NDV infection was shown to induce apoptosis in corresponding cells and the response was inhibited in A549 and U87MG cells with the addition of B18R protein. Treatment with combination of IFNs-α/-β/-λ or IFNs-α/-β or IFN-λ in NB1RGB, HEK293, A549 and U87MG showed that caspase activity in IFNs-α/-β/-λ group was the highest, followed with IFN-α/-β group and IFN-λ group. This suggests that tumor-selectivity of NDV is mainly because of the cumulative effect of type I and III in tumor cells that lead to higher apoptotic effect.
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Affiliation(s)
- Teridah Ernala Ginting
- Division of Immunology, Mochtar Riady Institute for Nanotechnology and Medical Science Group, University of Pelita Harapan, Jalan Boulevard Jenderal Sudirman 1688, Lippo Karawaci, Tangerang, Banten, 15811, Indonesia.
| | - Salomo Christian
- Division of Immunology, Mochtar Riady Institute for Nanotechnology and Medical Science Group, University of Pelita Harapan, Jalan Boulevard Jenderal Sudirman 1688, Lippo Karawaci, Tangerang, Banten, 15811, Indonesia
| | - Young Othiwi Larasati
- Division of Immunology, Mochtar Riady Institute for Nanotechnology and Medical Science Group, University of Pelita Harapan, Jalan Boulevard Jenderal Sudirman 1688, Lippo Karawaci, Tangerang, Banten, 15811, Indonesia
| | - Jeremiah Suryatenggara
- Division of Immunology, Mochtar Riady Institute for Nanotechnology and Medical Science Group, University of Pelita Harapan, Jalan Boulevard Jenderal Sudirman 1688, Lippo Karawaci, Tangerang, Banten, 15811, Indonesia
| | - Ivet Marita Suriapranata
- Division of Immunology, Mochtar Riady Institute for Nanotechnology and Medical Science Group, University of Pelita Harapan, Jalan Boulevard Jenderal Sudirman 1688, Lippo Karawaci, Tangerang, Banten, 15811, Indonesia
| | - George Mathew
- Division of Immunology, Mochtar Riady Institute for Nanotechnology and Medical Science Group, University of Pelita Harapan, Jalan Boulevard Jenderal Sudirman 1688, Lippo Karawaci, Tangerang, Banten, 15811, Indonesia
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5
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van Caam A, Vonk M, van den Hoogen F, van Lent P, van der Kraan P. Unraveling SSc Pathophysiology; The Myofibroblast. Front Immunol 2018; 9:2452. [PMID: 30483246 PMCID: PMC6242950 DOI: 10.3389/fimmu.2018.02452] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 10/04/2018] [Indexed: 12/31/2022] Open
Abstract
Systemic sclerosis (SSc) is a severe auto-immune disease, characterized by vasculopathy and fibrosis of connective tissues. SSc has a high morbidity and mortality and unfortunately no disease modifying therapy is currently available. A key cell in the pathophysiology of SSc is the myofibroblast. Myofibroblasts are fibroblasts with contractile properties that produce a large amount of pro-fibrotic extracellular matrix molecules such as collagen type I. In this narrative review we will discuss the presence, formation, and role of myofibroblasts in SSc, and how these processes are stimulated and mediated by cells of the (innate) immune system such as mast cells and T helper 2 lymphocytes. Furthermore, current novel therapeutic approaches to target myofibroblasts will be highlighted for future perspective.
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Affiliation(s)
- Arjan van Caam
- Experimental Rheumatology, Radboudumc, Nijmegen, Netherlands
| | - Madelon Vonk
- Department of Rheumatology, Radboudumc, Nijmegen, Netherlands
| | | | - Peter van Lent
- Experimental Rheumatology, Radboudumc, Nijmegen, Netherlands
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6
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Predescu SA, Zhang J, Bardita C, Patel M, Godbole V, Predescu DN. Mouse Lung Fibroblast Resistance to Fas-Mediated Apoptosis Is Dependent on the Baculoviral Inhibitor of Apoptosis Protein 4 and the Cellular FLICE-Inhibitory Protein. Front Physiol 2017; 8:128. [PMID: 28352235 PMCID: PMC5348516 DOI: 10.3389/fphys.2017.00128] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 02/17/2017] [Indexed: 01/01/2023] Open
Abstract
A characteristic feature of idiopathic pulmonary fibrosis (IPF) is accumulation of apoptotic resistant fibroblasts/myofibroblasts in the fibroblastic foci. As caveolin (Cav)-null mice develop pulmonary fibrosis (PF), we hypothesized that the participating fibroblasts display an apoptosis-resistant phenotype. To test this hypothesis and identify the molecular mechanisms involved we isolated lung fibroblasts from Cav-null mice and examined the expression of several inhibitors of apoptosis (IAPs), of c-FLIP, of Bcl-2 proteins and of the death receptor CD95/Fas. We found significant increase in XIAP and c-FLIP constitutive protein expression with no alteration of Bcl-2 and lower levels of CD95/Fas. The isolated fibroblasts were then treated with the CD95/Fas ligand (FasL) to induce apoptosis. While the morphological and biochemical alterations induced by FasL were similar in wild-type (wt) and Cav-null mouse lung fibroblasts, the time course and the extent of the alterations were greater in the Cav-null fibroblasts. Several salient features of Cav-null fibroblasts response such as loss of membrane potential, fragmentation of the mitochondrial continuum concurrent with caspase-8 activation, and subsequent Bid cleavage, prior to caspase-3 activation were detected. Furthermore, M30 antigen formation, phosphatidylserine expression and DNA fragmentation were caspase-3 dependent. SiRNA-mediated silencing of XIAP and c-FLIP, individually or combined, enhanced the sensitivity of lung fibroblasts to FasL-induced apoptosis. Pharmacological inhibition of Bcl-2 had no effect. Together our findings support a mechanism in which CD95/Fas engagement activates caspase-8, inducing mitochondrial apoptosis through Bid cleavage. XIAP and c-FLIP fine tune this process in a cell-type specific manner.
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Affiliation(s)
- Sanda A Predescu
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Jian Zhang
- Department of Biological Sciences, Columbia University New York, NY, USA
| | - Cristina Bardita
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Monal Patel
- Northwestern University Feinberg School of Medicine Chicago, IL, USA
| | - Varun Godbole
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Dan N Predescu
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
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7
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Park EY, Kim JI, Leem DG, Shin JS, Kim KT, Choi SY, Lee MH, Choi JH, Lee YS, Lee KT. Resveratrol analogue (E)-8-acetoxy-2-[2-(3,4-diacetoxyphenyl)ethenyl]-quinazoline induces apoptosis via Fas-mediated pathway in HL-60 human leukemia cells. Oncol Rep 2016; 36:3577-3587. [PMID: 27748905 DOI: 10.3892/or.2016.5168] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 10/03/2016] [Indexed: 11/05/2022] Open
Abstract
Previously, we reported that (E)-8-acetoxy-2-[2-(3,4-diacetoxyphenyl)ethenyl]-quinazoline (8-ADEQ), a synthetic analogue of resveratrol had anti-inflammatory and G2/M cell cycle arrest activities, but the underlying molecular mechanism of cytotoxic effects of this compound was not determined. In this study, 8-ADEQ displayed potent cytotoxicity and triggered apoptosis in HL-60 cells as evidenced by DNA fragmentation, DNA ladder formation, and the externalization of Annexin V-targeted phosphatidylserine residues in HL-60 cells. In addition, 8-ADEQ triggered activation of caspases-8, -9, -6 and -3 and cleavage of their substrates such as poly(ADP-ribose) polymerase (PARP). Moreover, 8-ADEQ induced loss of mitochondrial membrane potential (MMP) and release of cytochrome c to the cytosol. Caspase-3 inhibitor (z-DEVD-fmk), caspase-8 inhibitor (z-IETD-fmk), caspase-9 inhibitor (z-LEHD), and broad caspase inhibitor (z-VAD‑fmk) significantly suppressed the 8-ADEQ-induced DNA fragmentation. Interestingly, pretreatment with z-IETD-fmk, a caspase-8 inhibitor, completely abolished 8-ADEQ-induced caspase-3 and -9 activation, and subsequent DNA fragmentation. 8-ADEQ also increased the expression of Fas, Fas-associated death domain (FADD) and FasL, and formation of death-inducing signaling complex (DISC). Further analysis revealed that 8-ADEQ-induced apoptosis was mediated by upregulation of reactive oxidative species (ROS) generation. Taken together, our data indicated that 8-ADEQ-stimulated apoptosis in HL-60 leukemia cells is due to a Fas-mediated caspase-8-dependent pathway via ROS generation, but also, to a lesser extent cytochrome c release and caspase-9 activation.
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Affiliation(s)
- Eun Young Park
- Department of Pharmaceutical Biochemistry, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Joo-Il Kim
- Department of Pharmaceutical Biochemistry, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Dong-Gyu Leem
- Department of Pharmaceutical Biochemistry, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Ji-Sun Shin
- Department of Pharmaceutical Biochemistry, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Kyung-Tack Kim
- Traditional Food Research Center, Korea Food Research Institute, Seongnam 13539, Republic of Korea
| | - Sang Yoon Choi
- Traditional Food Research Center, Korea Food Research Institute, Seongnam 13539, Republic of Korea
| | - Myung-Hee Lee
- Traditional Food Research Center, Korea Food Research Institute, Seongnam 13539, Republic of Korea
| | - Jung-Hye Choi
- Department of Life and Nanopharmaceutical Science, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Yong Sup Lee
- Department of Life and Nanopharmaceutical Science, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Kyung-Tae Lee
- Department of Pharmaceutical Biochemistry, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
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8
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Cai Z, Zhao B, Deng Y, Shangguan S, Zhou F, Zhou W, Li X, Li Y, Chen G. Notch signaling in cerebrovascular diseases (Review). Mol Med Rep 2016; 14:2883-98. [PMID: 27574001 PMCID: PMC5042775 DOI: 10.3892/mmr.2016.5641] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Accepted: 07/22/2016] [Indexed: 12/30/2022] Open
Abstract
The Notch signaling pathway is a crucial regulator of numerous fundamental cellular processes. Increasing evidence suggests that Notch signaling is involved in inflammation and oxidative stress, and thus in the progress of cerebrovascular diseases. In addition, Notch signaling in cerebrovascular diseases is associated with apoptosis, angiogenesis and the function of blood-brain barrier. Despite the contradictory results obtained to date as to whether Notch signaling is harmful or beneficial, the regulation of Notch signaling may provide a novel strategy for the treatment of cerebrovascular diseases.
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Affiliation(s)
- Zhiyou Cai
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Bin Zhao
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Yanqing Deng
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Shouqin Shangguan
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Faming Zhou
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Wenqing Zhou
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Xiaoli Li
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Yanfeng Li
- Department of Neurology, Peking Union Medical College Hospital, Beijing 100730, P.R. China
| | - Guanghui Chen
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
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9
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BOLKENT Ş, ÖZTAY F, GEZGİNCİ OKTAYOĞLU S, SANCAR BAŞ S, KARATUĞ A. A matter of regeneration and repair: caspases as the key molecules. Turk J Biol 2016. [DOI: 10.3906/biy-1507-18] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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10
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Seol JY, Mihich E, Berleth ES. TNF Apoptosis Protection Fraction (TAPF) prevents apoptosis induced by TNF, but not by Fas or TRAIL, via NF-κB-induced increase in cFLIP. Cytokine 2015. [PMID: 26198031 DOI: 10.1016/j.cyto.2015.05.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Tumor Necrosis Factor α (TNFα) induces both the apoptotic pathway and anti-apoptotic factors. Incubation of human dermal fibroblasts with TAPF (TNF Apoptosis Protection Fraction) protects them from apoptosis induced by the subsequent addition of TNF and cycloheximide (CHX). TAPF does not protect against apoptosis induced by CHX in combination with either TRAIL (TNF related apoptosis inducing ligand) or an agonistic Fas antibody, or against apoptosis induced by the chemotherapeutic agent doxorubicin. Incubation with TAPF does not affect the quantity of TNF that binds to the cell. TAPF prevents TNF-induced cleavage of caspases 8, 9, 3 and 7 and the apoptotic substrate PARP (poly-ADP ribose polymerase), but has no effect when these molecules are induced by an agonistic Fas antibody. TAPF induces rapid phosphorylation of the NF-κB/p65 (nuclear factor-κB) transcription factor at serine 536 which is indicative of its activation. TAPF increases the expression of cFLIP (cellular FLICE-inhibitory protein) which is a potent inhibitor of apoptosis that acts by preventing the cleavage of caspase 8. This increase in cFLIP is coincident with protection from TNF-induced apoptosis. Decreasing cFLIP levels using shRNA (short hairpin RNA) decreases protection by TAPF. TAPF also induced the anti-apoptotic A20 protein. These data indicate that TAPF protects human dermal fibroblasts from TNF-induced apoptosis by induction of cFLIP and subsequent inhibition of caspase 8 cleavage.
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Affiliation(s)
- Ji-Yeon Seol
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263, USA.
| | - Enrico Mihich
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263, USA.
| | - Erica S Berleth
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263, USA.
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11
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Irimie AI, Braicu C, Zanoaga O, Pileczki V, Gherman C, Berindan-Neagoe I, Campian RS. Epigallocatechin-3-gallate suppresses cell proliferation and promotes apoptosis and autophagy in oral cancer SSC-4 cells. Onco Targets Ther 2015; 8:461-70. [PMID: 25759589 PMCID: PMC4346003 DOI: 10.2147/ott.s78358] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Epigallocatechin-3-gallate (EGCG) is the major bioactive component of green tea. Our experimental data indicated that EGCG treatment suppresses cell proliferation of SSC-4 human oral squamous cell carcinoma (OSCC), the effect being dose- and time-dependent. In parallel was observed the activation of apoptosis and autophagy, in response to EGCG exposure in SSC-4 cells. Treatment with EGCG activates the expression of the BAD, BAK, FAS, IGF1R, WNT11, and ZEB1 genes and inhibits CASP8, MYC, and TP53. All of these results suggest that EGCG has an excellent potential to become a therapeutic compound for patients with OSCC, by inducing tumor cell death via apoptosis and autophagy.
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Affiliation(s)
- Alexandra Iulia Irimie
- Department of Prosthodontics and Dental Materials, Faculty of Dental Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Cornelia Braicu
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Oana Zanoaga
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Valentina Pileczki
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania ; Department of Analytical Chemistry, Faculty of Pharmacy, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Claudia Gherman
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania ; Department of Functional Genomics and Experimental Pathology, The Oncology Institute "Prof Dr. Ion Chiricuta", Cluj-Napoca, Romania
| | - Ioana Berindan-Neagoe
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania ; Department of Functional Genomics and Experimental Pathology, The Oncology Institute "Prof Dr. Ion Chiricuta", Cluj-Napoca, Romania ; Department of Immunology, Faculty of Medicine, University of Medicine and Pharmacy, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania ; Department of Experimental Therapeutics MD Anderson Cancer Center Houston, TX, USA
| | - Radu Septimiu Campian
- Department of Oral Rehabilitation, Faculty of Dental Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
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12
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García-Ruiz I, Solís-Muñoz P, Fernández-Moreira D, Grau M, Colina F, Muñoz-Yagüe T, Solís-Herruzo JA. High-fat diet decreases activity of the oxidative phosphorylation complexes and causes nonalcoholic steatohepatitis in mice. Dis Model Mech 2014; 7:1287-96. [PMID: 25261569 PMCID: PMC4213732 DOI: 10.1242/dmm.016766] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is the most frequent histological finding in individuals with abnormal liver-function tests in the Western countries. In previous studies, we have shown that oxidative phosphorylation (OXPHOS) is decreased in individuals with NAFLD, but the cause of this mitochondrial dysfunction remains uncertain. The aims of this study were to determine whether feeding mice a high-fat diet (HFD) induces any change in the activity of OXPHOS, and to investigate the mechanisms involved in the pathogenesis of this defect. To that end, 30 mice were distributed between five groups: control mice fed a standard diet, and mice on a HFD and treated with saline solution, melatonin (an antioxidant), MnTBAP (a superoxide dismutase analog) or uric acid (a scavenger of peroxynitrite) for 28 weeks intraperitoneously. In the liver of these mice, we studied histology, activity and assembly of OXPHOS complexes, levels of subunits of these complexes, gene expression of these subunits, oxidative and nitrosative stress, and oxidative DNA damage. In HFD-fed mice, we found nonalcoholic steatohepatitis, increased gene expression of TNFα, IFNγ, MCP-1, caspase-3, TGFβ1 and collagen α1(I), and increased levels of 3-tyrosine nitrated proteins. The activity and assembly of all OXPHOS complexes was decreased to about 50–60%. The amount of all studied OXPHOS subunits was markedly decreased, particularly the mitochondrial-DNA-encoded subunits. Gene expression of mitochondrial-DNA-encoded subunits was decreased to about 60% of control. There was oxidative damage to mitochondrial DNA but not to genomic DNA. Treatment of HFD-fed mice with melatonin, MnTBAP or uric acid prevented all changes observed in untreated HFD-fed mice. We conclude that a HFD decreased OXPHOS enzymatic activity owing to a decreased amount of fully assembled complexes caused by a reduced synthesis of their subunits. Antioxidants and antiperoxynitrites prevented all of these changes, suggesting that nitro-oxidative stress played a key role in the pathogenesis of these alterations. Treatment with these agents might prevent the development of NAFLD in humans.
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Affiliation(s)
- Inmaculada García-Ruiz
- Research Center, Laboratory of Gastroenterology and Hepatology, University Hospital '12 de Octubre', Complutense University, 28041-Madrid, Spain.
| | - Pablo Solís-Muñoz
- Institute of Liver Studies, King's College Hospital, London, SE5 9RS, UK
| | - Daniel Fernández-Moreira
- Department of Bromatology and Food Hygiene, Military Center of Veterinary of Defense, 28024-Madrid, Spain
| | - Montserrat Grau
- Research Center, Laboratory of Gastroenterology and Hepatology, University Hospital '12 de Octubre', Complutense University, 28041-Madrid, Spain
| | - Francisco Colina
- Department of Pathology, University Hospital '12 de Octubre', Complutense University, 28041-Madrid, Spain
| | - Teresa Muñoz-Yagüe
- Research Center, Laboratory of Gastroenterology and Hepatology, University Hospital '12 de Octubre', Complutense University, 28041-Madrid, Spain
| | - José A Solís-Herruzo
- Research Center, Laboratory of Gastroenterology and Hepatology, University Hospital '12 de Octubre', Complutense University, 28041-Madrid, Spain
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Wang XY, Crowston JG, White AJR, Zoellner H, Healey PR. Interferon-alpha and interferon-gamma modulate Fas-mediated apoptosis in mitomycin-C-resistant human Tenon's fibroblasts. Clin Exp Ophthalmol 2013; 42:529-38. [PMID: 24224571 DOI: 10.1111/ceo.12268] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Accepted: 10/28/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND The aim of the study was to investigate, using a native mitomycin-C-resistant human Tenon's fibroblast cell line, the possibility that interferon-alpha and gamma could be used with Fas agonists as an alternative anti-fibrotic strategy to mitomycin-C in trabeculectomy. METHODS A clinically resistant and in vitro verified mitomycin-C-resistant human Tenon's fibroblast cell line was pretreated with interferon-alpha and interferon-gamma for 48 h before stimulation with an agonistic Fas antibody (CH11) for 2 days to induce cell death. Cell death assays were undertaken. Changes in apoptosis-related proteins were determined by flow cytometry and Western blot. RESULTS Pretreatment with interferon-alpha or interferon-gamma for 48 h increased Fas, Fas-associated protein with death domain and caspase-8 expression. Protein expression was further increased by combined exposure to interferon-alpha and gamma. Pretreatment with cytokines had no effect on Fas-L and Bcl-2. Interferon-alpha alone did not change the rate of induced cell death. A combination of interferon-alpha and gamma synergistically increased the sensitivity of mitomycin-C-resistant human Tenon's fibroblast cell line to induced cell death. An antagonistic anti-Fas antibody (ZB4) completely blocked induced cell death. Broad caspase inhibitors specific for caspases-8 and -3 reduced induced deaths in interferon pretreated mitomycin-C-resistant human Tenon's fibroblast cell line in a dose-dependent manner. CONCLUSIONS Interferon-alpha and interferon-gamma render mitomycin-C-resistant human Tenon's fibroblast cell line sensitive to Fas-mediated apoptosis. The mechanism involves increased death-inducing signalling complex formation by upregulation of Fas, Fas-associated protein with death domain and caspase-8 expression.
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Affiliation(s)
- Xiao Yang Wang
- Centre for Vision Research, Westmead Millennium Institute, The University of Sydney, Sydney, New South Wales, Australia
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14
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Bhatia A, Kumar Y. Cellular and molecular mechanisms in cancer immune escape: a comprehensive review. Expert Rev Clin Immunol 2013; 10:41-62. [PMID: 24325346 DOI: 10.1586/1744666x.2014.865519] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Immune escape is the final phase of cancer immunoediting process wherein cancer modulates our immune system to escape from being destroyed by it. Many cellular and molecular events govern the cancer's evasion of host immune response. The tumor undergoes continuous remodeling at the genetic, epigenetic and metabolic level to acquire resistance to apoptosis. At the same time, it effectively modifies all the components of the host's immunome so as to escape from its antitumor effects. Moreover, it induces accumulation of suppressive cells like Treg and myeloid derived suppressor cells and factors which also enable it to elude the immune system. Recent research in this area helps in defining the role of newer players like miRNAs and exosomes in immune escape. The immunotherapeutic approaches developed to target the escape phase appear quite promising; however, the quest for a perfect therapeutic agent that can achieve maximum cure with minimal toxicity continues.
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Affiliation(s)
- Alka Bhatia
- Department of Experimental Medicine & Biotechnology, PGIMER, Chandigarh-160012, India
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Zhao M, Zhang R, Xu X, Liu Y, Zhang H, Zhai X, Hu X. IL-10 reduces levels of apoptosis in Toxoplasma gondii-infected trophoblasts. PLoS One 2013; 8:e56455. [PMID: 23418570 PMCID: PMC3572055 DOI: 10.1371/journal.pone.0056455] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Accepted: 01/09/2013] [Indexed: 11/19/2022] Open
Abstract
Background To analyze the effects of IL-10 on the HLA-G expression and the apoptosis of trophoblasts infected with Toxoplasma gondii. Methods T. gondii-infected or uninfected human trophoblasts and immortalized human placental BeWo cells were cultured with or without human IL-10. Uninfected and infected cells without IL-10 cells served as controls. HLA-G expression was measured by real-time PCR and flow cytometry, respectively. Cells apoptosis were analyzed by flow cytometry. Apoptosis associated moleculars were measured by real-time PCR and Western bolt. Results HLA-G expression was increased in the infected trophoblasts and BeWo cells compared to uninfected cells. Treatment of infected cells with IL-10 decreased HLA-G expression compared to infected cells while no change in treatment of uninfected cells compared with uninfected cells. Levels of apoptosis and apoptosis associated caspase-3 and caspase-8 decreased and c-FLIP levels increased in treated infected cells with IL-10 compared to infected cells and no difference in IL-10 treated uninfected cells compared to uninfected cells. Conclusions IL-10 regulates HLA-G expression in T. gondii-infected trophoblasts. IL-10 treatment of infected trophoblasts reduced levels of apoptosis. This may contribute to the improvement in pregnancy outcomes when women infected with T. gondii treated with IL-10.
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Affiliation(s)
- Mingdong Zhao
- Department of Radiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, People's Republic of China
| | - Ruijin Zhang
- Department of Immunology, Binzhou Medical University, Yantai, People's Republic of China
| | - Xiaoyan Xu
- Department of Immunology, Binzhou Medical University, Yantai, People's Republic of China
| | - Yang Liu
- Department of Immunology, Binzhou Medical University, Yantai, People's Republic of China
| | - Haixia Zhang
- Department of Immunology, Binzhou Medical University, Yantai, People's Republic of China
| | - Xiaoyu Zhai
- Department of Immunology, Binzhou Medical University, Yantai, People's Republic of China
| | - Xuemei Hu
- Department of Immunology, Binzhou Medical University, Yantai, People's Republic of China
- * E-mail:
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Seidelin JB, Coskun M, Vainer B, Riis L, Soendergaard C, Nielsen OH. ERK controls epithelial cell death receptor signalling and cellular FLICE-like inhibitory protein (c-FLIP) in ulcerative colitis. J Mol Med (Berl) 2013; 91:839-49. [DOI: 10.1007/s00109-013-1003-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 12/18/2012] [Accepted: 01/17/2013] [Indexed: 12/24/2022]
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17
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Keswani T, Bhattacharyya A. Splenocyte apoptosis inPlasmodium berghei ANKAinfection: possible role of TNF-α and TGF-β. Parasite Immunol 2013; 35:73-90. [DOI: 10.1111/pim.12005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 08/23/2012] [Indexed: 12/25/2022]
Affiliation(s)
- T. Keswani
- Immunology Lab; Department of Zoology; University of Calcutta; Kolkata; India
| | - A. Bhattacharyya
- Immunology Lab; Department of Zoology; University of Calcutta; Kolkata; India
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Usategui A, del Rey MJ, Pablos JL. Fibroblast abnormalities in the pathogenesis of systemic sclerosis. Expert Rev Clin Immunol 2011; 7:491-8. [PMID: 21790292 DOI: 10.1586/eci.11.39] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Systemic sclerosis (SSc) is a chronic systemic disease characterized by autoimmunity, vascular lesions and progressive fibrosis. The fibrotic component is dominant in SSc compared with other vascular or autoimmune diseases and determines its prognosis and therapeutic refractoriness. Fibroblasts are responsible for abnormal extracellular matrix accumulation. Studies in cultured SSc skin fibroblasts have facilitated the identification of potential pathways involved in their profibrotic phenotype. Profibrotic fibroblasts characterized by abnormal growth and extracellular matrix synthesis may differentiate or expand from normal resident fibroblasts. Recruitment of bone marrow-derived progenitors and transdifferentiation of different cell lineages might also be involved. Multiple factors and signaling pathways appear to be involved in the development or persistence of the SSc fibroblast phenotype. Although their relative relevance and interplay are unclear, aberrant TGF-β signaling seems pivotal and constitutes the best characterized therapeutic target.
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Affiliation(s)
- Alicia Usategui
- Instituto de Investigación Hospital 12 de Octubre, Madrid, Spain
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Abstract
During wound healing, contractile fibroblasts called myofibroblasts regulate the formation and contraction of granulation tissue; however, pathological and persistent myofibroblast activation, which occurs in hypertrophic scars or tissue fibrosis, results in a loss of function. Many reviews outline the cellular and molecular features of myofibroblasts and their roles in a variety of diseases. This review focuses on the origins of myofibroblasts and the factors that control their differentiation and prolonged survival in fibrotic tissues. Pulmonary fibrosis is used to illustrate many key points, but examples from other tissues and models are also included. Myofibroblasts originate mostly from tissue-resident fibroblasts, and also from epithelial and endothelial cells or other mesenchymal precursors. Their differentiation is influenced by cytokines, growth factors, extracellular matrix composition and stiffness, and cell surface molecules such as proteoglycans and THY1, among other factors. Many of these effects are modulated by cell contraction. Myofibroblasts resist programmed cell death, which promotes their accumulation in fibrotic tissues. The cause of resistance to apoptosis in myofibroblasts is under ongoing investigation, but many of the same stimuli that regulate their differentiation are involved. The contributions of oxidative stress, the WNT-β-catenin pathway and PPARγ to myofibroblast differentiation and survival are increasingly appreciated.
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20
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Solís-Muñoz P, Solís-Herruzo JA, Fernández-Moreira D, Gómez-Izquierdo E, García-Consuegra I, Muñoz-Yagüe T, García Ruiz I. Melatonin improves mitochondrial respiratory chain activity and liver morphology in ob/ob mice. J Pineal Res 2011; 51:113-23. [PMID: 21355880 DOI: 10.1111/j.1600-079x.2011.00868.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In previous studies, we have shown that mitochondrial respiratory chain (MRC) activity is decreased in patients with nonalcoholic steatohepatitis and in ob/ob mice and that peroxynitrite plays a pathogenic role. The present study examined whether melatonin, a peroxynitrite scavenger, prevents: (i) the in vitro effects of peroxynitrite on normal mitochondrial proteins and (ii) the development of nonalcoholic liver disease, MRC dysfunction and proteomic changes found in the mitochondrial complexes from ob/ob mice. We studied MRC activity, assembly of mitochondrial complexes and its subunits in normal mitochondrial proteins exposed to peroxynitrite in the absence and presence of melatonin. The same studies were done in mitochondrial proteins from ob/ob mice untreated and treated with melatonin. Preincubation of mitochondrial proteins from wild-type mice with melatonin prevented 3-tyrosine nitration of these proteins, eliminated the reduction in the MRC activity, the defect in the assembly of mitochondrial complexes and degradation of their subunits induced by peroxynitrite in vitro. Moreover, treatment of ob/ob mice with 10 mg/kg/day melatonin for 12 wk reduced oxidative and nitrosative stress, prevented the loss of MRC activity, protected their complexes and subunits from degradation, and favored assembling of mitochondrial complexes. In addition, this treatment improved fatty liver, decreased hepatic triglyceride concentration and increased apolipoprotein B100 in liver tissue. In conclusion, melatonin prevents the effects of peroxynitrite on mitochondrial proteins in vitro and administration of melatonin to ob/ob mice normalizes liver morphology, mitochondrial dysfunction and assembly of MRC complexes.
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Affiliation(s)
- Pablo Solís-Muñoz
- Research Center, Hospital Universitario 12 de Octubre, Universidad Complutense, School of Medicine, Madrid, Spain
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21
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Hayashi S, Nishiyama T, Miura Y, Fujishiro T, Kanzaki N, Hashimoto S, Matsumoto T, Kurosaka M, Kuroda R. DcR3 induces cell proliferation through MAPK signaling in chondrocytes of osteoarthritis. Osteoarthritis Cartilage 2011; 19:903-10. [PMID: 21420502 DOI: 10.1016/j.joca.2011.03.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 03/01/2011] [Accepted: 03/11/2011] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Decoy receptor 3 (DcR3), a soluble receptor belonging to the tumor necrosis factor (TNF) receptor superfamily, competitively binds and inhibits the TNF family including Fas-ligand (Fas-L), lymphotoxin-like inducible protein that competes with glycoprotein D for binding herpesvirus entry mediator on T-cells (LIGHT) and TNF-like ligand 1A (TL1A). In this study, we investigated the functions of DcR3 on osteoarthritis (OA) chondrocytes. METHODS Expressions of DcR3 in chondrocytes were measured by realtime Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR). Expression of DcR3 in sera and joint fluids was measured by enzyme-linked immunosorbent assay (ELISA). Chondrocytes were incubated with DcR3-Fc chimera protein (DcR3-Fc) before induction of apoptosis by Fas-L and apoptosis was detected with terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labelling labeling (TUNEL) staining and Western blotting of caspase 8 and poly (ADP-ribose) polymerase (PARP). Chondrocytes were incubated with DcR3-Fc and the proliferation was analyzed by 4-[3-(4-iodophenyl)-2-(4-nitrophenyl)-2H-5-tetrazolio]-1,3-benzene disulfonate (WST) assay. Phosphorylation of Extracellular Signal-Regulated Kinase (ERK), P38 mitogen-activated protein kinase (MAPK) and Jun N-terminal Kinase (JNK) in chondrocytes was measured by Western blotting after incubation with DcR3-Fc, Mitogen-activated protein kinase kinase (MEK1/2) inhibitor, or P38 MAPK inhibitor. Chondrocytes were treated with DcR3-Fc after pre-incubation with blocking antibody of Fas-L, LIGHT and TL1A, and proliferation or phosphorylation of ERK was analyzed. RESULTS DcR3 was expressed in OA and normal chondrocytes. DcR3-Fc protects chondrocytes from Fas-induced apoptosis. DcR3-Fc increased chondrocytes proliferation and induced the phosphorylation of ERK specifically. DcR3-induced chondrocytes proliferation was inhibited by pre-incubation of PD098059 or blocking Fas-L antibody. DcR3 increased chondrocytes proliferation in OA chondrocytes, but did not in normal. CONCLUSION DcR3 regulates the proliferation of OA chondrocytes via ERK signaling and Fas-induced apoptosis.
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Affiliation(s)
- S Hayashi
- Department of Orthopaedic Surgery, Kobe University, Graduate School of Medicine, Kobe, Japan
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22
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Etiopathology of chronic tubular, glomerular and renovascular nephropathies: clinical implications. J Transl Med 2011; 9:13. [PMID: 21251296 PMCID: PMC3034700 DOI: 10.1186/1479-5876-9-13] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Accepted: 01/20/2011] [Indexed: 02/06/2023] Open
Abstract
Chronic kidney disease (CKD) comprises a group of pathologies in which the renal excretory function is chronically compromised. Most, but not all, forms of CKD are progressive and irreversible, pathological syndromes that start silently (i.e. no functional alterations are evident), continue through renal dysfunction and ends up in renal failure. At this point, kidney transplant or dialysis (renal replacement therapy, RRT) becomes necessary to prevent death derived from the inability of the kidneys to cleanse the blood and achieve hydroelectrolytic balance. Worldwide, nearly 1.5 million people need RRT, and the incidence of CKD has increased significantly over the last decades. Diabetes and hypertension are among the leading causes of end stage renal disease, although autoimmunity, renal atherosclerosis, certain infections, drugs and toxins, obstruction of the urinary tract, genetic alterations, and other insults may initiate the disease by damaging the glomerular, tubular, vascular or interstitial compartments of the kidneys. In all cases, CKD eventually compromises all these structures and gives rise to a similar phenotype regardless of etiology. This review describes with an integrative approach the pathophysiological process of tubulointerstitial, glomerular and renovascular diseases, and makes emphasis on the key cellular and molecular events involved. It further analyses the key mechanisms leading to a merging phenotype and pathophysiological scenario as etiologically distinct diseases progress. Finally clinical implications and future experimental and therapeutic perspectives are discussed.
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Finch CE, Morgan TE, Longo VD, de Magalhaes JP. Cell resilience in species life spans: a link to inflammation? Aging Cell 2010; 9:519-26. [PMID: 20415721 DOI: 10.1111/j.1474-9726.2010.00578.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Species differences in life span have been attributed to cellular survival during various stressors, designated here as 'cell resilience'. In primary fibroblast cultures, cell resilience during exposure to free radicals, hypoglycemia, hyperthermia, and various toxins has shown generally consistent correlations with the species characteristic life spans of birds and mammals. However, the mechanistic links of cell resilience in fibroblast cultures to different species life spans are poorly understood. We propose that certain experimental stressors are relevant to somatic damage in vivo during inflammatory responses of innate immunity, particularly, resistance to reactive oxygen species (ROS), low glucose, and hyperthermia. According to this hypothesis, somatic cell resilience determines species differences in longevity during repeated infections and traumatic injuries in the natural environment. Infections and injury expose local fibroblasts and other cells to ROS generated by macrophages and to local temperature elevations. Systemically, acute phase immune reactions cause hypoglycemia and hyperthermia. We propose that cell resilience to somatic stressors incurred in inflammation is important in the evolution of longevity and that longer-lived species are specifically more resistant to immune-related stressors. This hypothesis further specifies Kirkwood's disposable soma theory. We suggest expanding the battery of stressors and markers used for comparative studies to additional cell types and additional parameters relevant to host defense and to their ecological specificities.
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Affiliation(s)
- Caleb E Finch
- University of Southern California, Los Angeles, CA 90089-0191, USA.
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Jung SN, Park IJ, Kim MJ, Kang I, Choe W, Kim SS, Ha J. Down-regulation of AMP-activated protein kinase sensitizes DU145 carcinoma to Fas-induced apoptosis via c-FLIP degradation. Exp Cell Res 2009; 315:2433-41. [DOI: 10.1016/j.yexcr.2009.05.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2008] [Revised: 05/14/2009] [Accepted: 05/19/2009] [Indexed: 11/29/2022]
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Fas-mediated apoptosis is regulated by the extracellular matrix protein CCN1 (CYR61) in vitro and in vivo. Mol Cell Biol 2009; 29:3266-79. [PMID: 19364818 DOI: 10.1128/mcb.00064-09] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Although Fas ligand (FasL) is primarily expressed by lymphoid cells, its receptor Fas (CD95/Apo-1) is broadly expressed in numerous nonlymphoid tissues and can mediate apoptosis of parenchymal cells upon injury and infiltration of inflammatory cells. Here we show that CCN1 (CYR61) and CCN2 (CTGF), matricellular proteins upregulated at sites of inflammation and wound repair, synergize with FasL to induce apoptosis by elevating cellular levels of reactive oxygen species (ROS). CCN1 acts through engagement of integrin alpha(6)beta(1) and cell surface heparan sulfate proteoglycans, leading to ROS-dependent hyperactivation of p38 mitogen-activated protein kinase in the presence of FasL to enhance mitochondrial cytochrome c release. We show that CCN1 activates neutral sphingomyelinase, which functions as a key source of CCN1-induced ROS critical for synergism with FasL. Furthermore, Fas-dependent hepatic apoptosis induced by an agonistic monoclonal anti-Fas antibody or intragastric administration of alcohol is severely blunted in knock-in mice expressing an apoptosis-defective Ccn1 allele. These results demonstrate that CCN1 is a physiologic regulator of Fas-mediated apoptosis and that the extracellular matrix microenvironment can modulate Fas-dependent apoptosis through CCN1 expression.
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Luo A, Wang W, Sima N, Lu Y, Zhou J, Xu G, Yu H, Wang S, Ma D. Short hairpin RNA targeting c-FLIP sensitizes human cervical adenocarcinoma Hela cells to chemotherapy and radiotherapy. Cancer Lett 2008; 271:323-32. [PMID: 18675507 DOI: 10.1016/j.canlet.2008.06.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2008] [Revised: 04/04/2008] [Accepted: 06/23/2008] [Indexed: 12/13/2022]
Abstract
c-FLIP inhibits caspase-8 activation and cell apoptosis mediated by death receptors. The present study aims at determining the effects of c-FLIP targeted vector-based short hairpin RNA (shRNA) on cell growth and evaluating its modulation of responsiveness to drugs and radiotherapy in cervical adenocarcinoma Hela cells. cFLIP expression of the cells transfected with shRNA against c-FLIP was significantly down-regulated after 72 h. c-FLIP silencing markedly suppressed cell proliferation and increased cell apoptosis. The activation of caspase-8 and caspase-3 was induced with shRNA targeting cFLIP with the passage of time after transfection. Furthermore, Vector-based shRNA against c-FLIP subsequently increased the sensitivity to cisplatin, iritican and Co60 radiotherapy by about 4- to 6-folds in Hela cells. Our data suggest that vector-based shRNA effectively inhibited c-FLIP expression, enhanced the expression level of caspase-8 and caspase-3 to induce cell apoptosis, probably with the higher efficacy in combination therapies with conventional chemotherapy and radiotherapy in cervical adenocarcinoma.
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Affiliation(s)
- Aiyue Luo
- Cancer Biology Research Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China
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MATSUDA F, INOUE N, GOTO Y, MAEDA A, CHENG Y, SAKAMAKI K, MANABE N. cFLIP Regulates Death Receptor-mediated Apoptosis in an Ovarian Granulosa Cell Line by Inhibiting Procaspase-8 Cleavage. J Reprod Dev 2008; 54:314-20. [DOI: 10.1262/jrd.20051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Fuko MATSUDA
- Research Unit for Animal Life Sciences, Animal Resource Science Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo
| | - Naoko INOUE
- Laboratory of Animal Morphology and Function, Graduate School of Bioagricultural Sciences, Nagoya University
| | - Yasufumi GOTO
- Research Unit for Animal Life Sciences, Animal Resource Science Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo
| | - Akihisa MAEDA
- Research Unit for Animal Life Sciences, Animal Resource Science Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo
| | - Yuan CHENG
- Research Unit for Animal Life Sciences, Animal Resource Science Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo
| | - Kazuhiro SAKAMAKI
- Laboratory of Tumor Cell Biology, Department of Life Sciences, Kyoto University
| | - Noboru MANABE
- Research Unit for Animal Life Sciences, Animal Resource Science Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo
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Zeldich E, Koren R, Dard M, Nemcovsky C, Weinreb M. Enamel matrix derivative protects human gingival fibroblasts from TNF-induced apoptosis by inhibiting caspase activation. J Cell Physiol 2007; 213:750-8. [PMID: 17607712 DOI: 10.1002/jcp.21142] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Emdogain, a formulation of enamel matrix derivative (EMD), is used clinically for regeneration of the periodontium (tooth supporting tissues), but the molecular mechanisms of its action have not been elucidated. Several clinical studies suggested that EMD may also improve gingival healing after periodontal surgery and thus affect the fate of gingival fibroblasts (GFs). Since these cells are targets for local inflammatory mediators such as TNF, a pro-apoptotic cytokine, during the course of periodontal disease, we tested whether EMD protects human GFs (hGFs) from TNF-induced cytotoxicity. Quiescent primary hGFs were challenged with TNF (10-100 ng/ml) with or without EMD (100 microg/ml) pretreatment. Cell viability was assessed by neutral red staining, cell death by LDH release and apoptosis by caspase activity. Signaling pathways were evaluated by Western blotting and pharmacological inhibitors. TNF induced classical signs of apoptosis in hGFs, including typical cellular morphology and increased caspase activity. TNF-induced cytotoxicity was entirely caspase-dependent. Pretreatment (4-24 h) with EMD dramatically inhibited the activation of initiator and executioner caspases and enhanced hGF survival. Although TNF induced the activation of p38 MAPK, JNK, ERK and PI-3K signaling, these pathways were not crucial for EMD protection of hGFs. However, EMD increased the levels of c-FLIP(L), an anti-apoptotic protein located upstream of caspase activation. These data demonstrate, for the first time, that EMD protects hGFs from inflammatory cytokines and, together with our recent reports that EMD stimulates rat and human GF proliferation, could help explain the mechanisms whereby in vivo use of EMD promotes gingival healing.
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Affiliation(s)
- E Zeldich
- Department of Oral Biology, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel-Aviv University, Tel-Aviv, Israel
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Bojič L, Petelin A, Stoka V, Reinheckel T, Peters C, Turk V, Turk B. Cysteine cathepsins are not involved in Fas/CD95 signalling in primary skin fibroblasts. FEBS Lett 2007; 581:5185-90. [DOI: 10.1016/j.febslet.2007.10.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 10/02/2007] [Accepted: 10/02/2007] [Indexed: 10/22/2022]
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Wilson TR, McLaughlin KM, McEwan M, Sakai H, Rogers KMA, Redmond KM, Johnston PG, Longley DB. c-FLIP: a key regulator of colorectal cancer cell death. Cancer Res 2007; 67:5754-62. [PMID: 17575142 DOI: 10.1158/0008-5472.can-06-3585] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
c-FLIP is an inhibitor of apoptosis mediated by the death receptors Fas, DR4, and DR5 and is expressed as long (c-FLIP(L)) and short (c-FLIP(S)) splice forms. We found that small interfering RNA (siRNA)-mediated silencing of c-FLIP induced spontaneous apoptosis in a panel of p53 wild-type, mutant, and null colorectal cancer cell lines and that this apoptosis was mediated by caspase-8 and Fas-associated death domain. Further analyses indicated the involvement of DR5 and/or Fas (but not DR4) in regulating apoptosis induced by c-FLIP siRNA. Interestingly, these effects were not dependent on activation of DR5 or Fas by their ligands tumor necrosis factor-related apoptosis-inducing ligand and FasL. Overexpression of c-FLIP(L), but not c-FLIP(S), significantly decreased spontaneous and chemotherapy-induced apoptosis in HCT116 cells. Further analyses with splice form-specific siRNAs indicated that c-FLIP(L) was the more important splice form in regulating apoptosis in HCT116, H630, and LoVo cells, although specific knockdown of c-FLIP(S) induced more apoptosis in the HT29 cell line. Importantly, intratumoral delivery of c-FLIP-targeted siRNA duplexes induced apoptosis and inhibited the growth of HCT116 xenografts in BALB/c severe combined immunodeficient mice. In addition, the growth of c-FLIP(L)-overexpressing colorectal cancer xenografts was more rapid than control xenografts, an effect that was significantly enhanced in the presence of chemotherapy. These results indicate that c-FLIP inhibits spontaneous death ligand-independent, death receptor-mediated apoptosis in colorectal cancer cells and that targeting c-FLIP may have therapeutic potential for the treatment of colorectal cancer.
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Affiliation(s)
- Timothy R Wilson
- Drug Resistance Group, Centre for Cancer Research and Cell Biology, Queen's University Belfast, Belfast, Northern Ireland
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García-Ruiz I, Rodríguez-Juan C, Díaz-Sanjuán T, Martínez MA, Muñoz-Yagüe T, Solís-Herruzo JA. Effects of rosiglitazone on the liver histology and mitochondrial function in ob/ob mice. Hepatology 2007; 46:414-23. [PMID: 17654601 DOI: 10.1002/hep.21687] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
UNLABELLED Insulin resistance is present in almost all patients with nonalcoholic steatohepatitis (NAFLD), and mitochondrial dysfunction likely plays a critical role in the progression of fatty liver into nonalcoholic steatohepatitis. Rosiglitazone, a selective ligand of peroxisome proliferator-activated receptor gamma (PPARgamma), is an insulin sensitizer drug that has been used in a number of insulin-resistant conditions, including NAFLD. The aim of this study was to analyze the effects of rosiglitazone on the liver histology and mitochondrial function in a model of NAFLD. All studies were carried out in wild-type and leptin-deficient (ob/ob) C57BL/6J mice. Ob/ob mice were treated with 1 mg/kg/day, and activity of mitochondrial respiratory chain (MRC), beta-oxidation, lipid peroxidation, glutathione content in mitochondria, and 3-tyrosine-nitrated proteins in mitochondria were measured. In addition, histological and ultrastructural changes induced by rosiglitazone were also noted. Rosiglitazone treatment increased liver steatosis, particularly microvesicular steatosis. In these animals, mitochondria were markedly swollen with cristae peripherally placed. In ob/ob mice, this drug increased PPARgamma protein expression and lipid peroxide content in liver tissue and decreased glutathione concentration in mitochondria. Rosiglitazone suppressed the activity of complex I of the MRC in ob/ob mice, but did not affect beta-oxidation. 3-Tyrosine nitrated mitochondrial proteins, significantly increased in ob/ob mice, were not modified by rosiglitazone treatment. CONCLUSION Treatment of ob/ob mice with rosiglitazone did not reverse histological lesions of NAFLD or improve MRC activity. On the contrary, rosiglitazone reduced activity of complex I and increased oxidative stress and liver steatosis.
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Hoben GM, Hu JC, James RA, Athanasiou KA. Self-assembly of fibrochondrocytes and chondrocytes for tissue engineering of the knee meniscus. ACTA ACUST UNITED AC 2007; 13:939-46. [PMID: 17484700 DOI: 10.1089/ten.2006.0116] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Chondrocyte self-assembly in high-density scaffoldless culture has shown success in producing articular cartilage constructs, and a similar process could be applied to fibrocartilage tissue engineering. Three cell combinations were compared in self-assembly culture-100% chondrocytes, 100% meniscal fibrochondrocytes, and 50:50 co-cultures of fibrochondrocytes and chondrocytes with the goal of creating a proteoglycan, collagen I, and collagen II matrix similar to native meniscus. Two culture surfaces were also compared for self-assembly: agarose-coated wells and tissue culture plastic. After 4 weeks, the resulting self-assembled chondrocyte constructs were 10.24+/-0.63 mm in diameter and 0.96+/-0.14 mm thick, weighing 84.5+/-7.2 mg. Co-culture constructs were smaller and weighed 22.5+/-1.0 mg. In contrast, the fibrochondrocyte constructs contracted into spheres weighing 1.3+/-0.3 mg. Immunostaining showed collagen II in the chondrocyte constructs, both collagen I and collagen II in the co-cultures, and only collagen I in the fibrochondrocyte constructs. Collagen densities for chondrocyte, co-culture, and fibrochondrocyte constructs were 41+/-3, 38+/-3, and 20+/-2 microg/mg dry weight, and glycosaminoglycan densities were 230+/-2, 80+/-6, and 10+/-1 microg/mg dry weight, respectively. Self-assembled co-cultures, with their mixed collagen I and II matrix and robust gross characteristics, appear promising for tissue engineering of the knee meniscus.
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Affiliation(s)
- Gwendolyn M Hoben
- Department of Bioengineering, Rice University, Houston, Texas 77005, USA
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Chung MJ, Liu T, Ullenbruch M, Phan SH. Antiapoptotic effect of found in inflammatory zone (FIZZ)1 on mouse lung fibroblasts. J Pathol 2007; 212:180-7. [PMID: 17492827 DOI: 10.1002/path.2161] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Myofibroblasts play an essential role in the abnormal deposition of extracellular matrix in pulmonary fibrosis. The presence or prolonged survival of these cells may be a key factor in the pathogenesis of progressive pulmonary fibrosis. Found in inflammatory zone (FIZZ)1 can induce myofibroblast differentiation and has an antiapoptotic effect on embryonic lung explant cultures. In this study, we investigated whether FIZZ1 also has an antiapoptotic effect on mouse lung fibroblasts (MLFs). Cells were treated with FIZZ1 for 24 h and then apoptosis was induced by TNFalpha in the presence of cycloheximide (CHX). FIZZ1 exhibited an antiapoptotic effect in MLFs, as assessed by flow cytometric analysis and TUNEL staining. Moreover, the cell number was higher in the FIZZ1-treated group relative to the non-treated control group after treatment with TNFalpha and CHX. FIZZ1 treatment also inhibited the apoptotic agent-induced activities of caspase-3 and caspase-8. Examination of potential signalling pathways revealed that FIZZ1 induced rapid phosphorylation of ERK-1/2, while PD98059, a MEK/ERK inhibitor, markedly induced activation of caspase-3. This anti-apoptotic effect of FIZZ1 was associated with induction of myofibroblast differentiation in response to FIZZ1 stimulation. Taken together, these findings suggest that FIZZ1 is involved in pulmonary fibrosis through both induction of myofibroblast differentiation and increased or prolonged survival of myofibroblasts. This effect of FIZZ1 was mediated by inhibition of caspase-3 and -8, with involvement of the ERK pathway.
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Affiliation(s)
- M J Chung
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109-2200, USA
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Hayashi S, Miura Y, Nishiyama T, Mitani M, Tateishi K, Sakai Y, Hashiramoto A, Kurosaka M, Shiozawa S, Doita M. Decoy receptor 3 expressed in rheumatoid synovial fibroblasts protects the cells against Fas-induced apoptosis. ACTA ACUST UNITED AC 2007; 56:1067-75. [PMID: 17393415 DOI: 10.1002/art.22494] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Decoy receptor 3 (DcR3), a newly identified member of the tumor necrosis factor receptor (TNFR) superfamily, is a soluble receptor that binds to members of the TNF family, including FasL, LIGHT, and TNF-like molecule 1A. DcR3 is mostly expressed in tumor cells, and it competitively inhibits binding of TNF to TNFRs. The present study was undertaken to investigate DcR3 expression in fibroblast-like synoviocytes (FLS) from patients with rheumatoid arthritis (RA) and osteoarthritis (OA), and to analyze the effects of DcR3 on Fas-induced apoptosis in RA FLS. METHODS Expression of DcR3 in FLS was measured by reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blotting. FLS were incubated with DcR3-Fc chimera protein or transfected with DcR3 small interfering RNA (siRNA) using the lipofection method, before induction of apoptosis. Apoptosis induced by Fas in FLS was detected with TUNEL staining and Western blotting of caspase 8 and poly(ADP-ribose) polymerase. Finally, FLS were incubated with TNFalpha prior to Fas-induced apoptosis, expression of DcR3 was analyzed by quantitative RT-PCR, and apoptosis was measured. RESULTS DcR3 was expressed in both RA FLS and OA FLS. DcR3-Fc protein inhibited Fas-induced apoptosis in FLS. Down-regulation of DcR3 in FLS by siRNA increased Fas-induced apoptosis. TNFalpha increased DcR3 expression and inhibited Fas-induced apoptosis in RA FLS, but not in OA FLS. CONCLUSION DcR3 expressed in RA FLS is increased by TNFalpha and protects the cells against Fas-induced apoptosis. These findings indicate that DcR3 may be a possible therapeutic target in RA.
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MESH Headings
- Apoptosis/drug effects
- Arthritis, Rheumatoid/pathology
- Cell Survival/drug effects
- Cells, Cultured
- Down-Regulation
- Fas Ligand Protein/pharmacology
- Fibroblasts/drug effects
- Fibroblasts/metabolism
- Fibroblasts/pathology
- Gene Expression
- Humans
- Immunoglobulin Fc Fragments/genetics
- Immunoglobulin Fc Fragments/metabolism
- Immunotoxins/pharmacology
- In Situ Nick-End Labeling
- Osteoarthritis, Knee/pathology
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Receptors, Tumor Necrosis Factor, Member 6b/genetics
- Receptors, Tumor Necrosis Factor, Member 6b/metabolism
- Receptors, Tumor Necrosis Factor, Member 6b/pharmacology
- Recombinant Fusion Proteins/pharmacology
- Reverse Transcriptase Polymerase Chain Reaction
- Synovial Membrane/drug effects
- Synovial Membrane/metabolism
- Synovial Membrane/pathology
- Transfection
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Affiliation(s)
- Shinya Hayashi
- Division of Orthopedic Sciences, Faculty of Health Sciences, Kobe University School of Medicine, Kobe, Japan
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Fujiwara M, Suemoto H, Muragaki Y, Ooshima A. Fas-mediated upregulation of vascular endothelial growth factor and monocyte chemoattractant protein-1 expression in cultured dermal fibroblasts: Role in the inflammatory response. J Dermatol 2007; 34:99-109. [PMID: 17239146 DOI: 10.1111/j.1346-8138.2006.00226.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The Fas-Fas ligand interaction is the most important pathway in starting apoptosis. In addition, several recent reports have emerged documenting non-apoptotic roles for Fas. However, a non-apoptotic role of Fas in dermal fibroblasts remains unknown. The present study investigated whether Fas stimulation not only promotes apoptosis but also stimulates elements of the inflammatory response such as angiogenesis and macrophage infiltration. Fas stimulation was performed by treating cultured human dermal fibroblasts with an agonistic anti-Fas monoclonal antibody (mAb). Anti-Fas mAb-treated fibroblasts showed a significantly greater increase of caspase-3 and caspase-8 activity compared with control fibroblasts. Addition of the anti-Fas mAb induced DNA fragmentation, as confirmed by the DNA ladder assay. Terminal deoxynucleotidyl transferase-mediated 2'-deoxyuridine 5'-triphosphate nick end labeling (TUNEL) staining showed that treatment with the anti-Fas mAb induced an increase of apoptotic fibroblasts in a time-dependent manner. At both mRNA and protein levels, anti-Fas mAb-treated fibroblasts showed significantly higher expression of vascular endothelial growth factor (VEGF) and monocyte chemoattractant protein (MCP)-1 compared with control fibroblasts. A pan-caspase inhibitor (Z-VAD-FMK) significantly inhibited VEGF and MCP-1 expression. After transplantation of fibroblasts into mice with severe combined immunodeficiency, the nodules derived from anti-Fas mAb-treated fibroblasts showed more abundant neovascularization, increased macrophage infiltration, and more apoptotic cells in comparison with nodules derived from control fibroblasts. The results of both in vitro and in vivo studies confirmed significantly higher angiogenic activity and macrophage chemotactic activity of anti-Fas mAb-treated fibroblasts compared with control fibroblasts.
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Affiliation(s)
- Masao Fujiwara
- Department of Plastic and Reconstructive Surgery, Shimane Prefectural Central Hospital, Izumo, Japan.
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da Silva Correia J, Miranda Y, Leonard N, Hsu J, Ulevitch RJ. Regulation of Nod1-mediated signaling pathways. Cell Death Differ 2006; 14:830-9. [PMID: 17186025 DOI: 10.1038/sj.cdd.4402070] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Nod1 is a member of the NLR/Nod/CATERPILLER family. It acts as a sensor for intracellular bacteria by recognizing specific glycopeptides derived from peptidoglycan. Nod1 activation mediates distinct cellular responses including activation of MAP kinases, IL-8 release, apoptosis and suppression of several estrogen-dependent responses in MCF-7 cells. Here we have extended these studies by identifying key regulatory steps in Nod1-dependent signaling pathways. We provide multiple lines of data showing that Nod1-dependent apoptosis is a caspase 8-mediated event and that apoptosis requires RIP2. In contrast, several lines of evidence show that Nod1-dependent JNK activation and IL-8 production did not require the presence of caspase 8 but required activation of TAK1 as well as RIP2. Thus, we have identified several key control points that lie downstream of Nod1. This work provides the basis for further studies of the biological significance and regulation of the Nod1 pathway.
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Affiliation(s)
- J da Silva Correia
- Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037, USA
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37
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Bharhani MS, Borojevic R, Basak S, Ho E, Zhou P, Croitoru K. IL-10 protects mouse intestinal epithelial cells from Fas-induced apoptosis via modulating Fas expression and altering caspase-8 and FLIP expression. Am J Physiol Gastrointest Liver Physiol 2006; 291:G820-9. [PMID: 17030898 DOI: 10.1152/ajpgi.00438.2005] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We have previously shown that the absence of Fas/Fas ligand significantly reduced tissue damage and intestinal epithelial cell (IEC) apoptosis in an in vivo model of T cell-mediated enteropathy. This enteropathy was more severe in IL-10-deficient mice, and this was associated with increased serum levels of IFN-gamma and TNF-alpha and an increase in Fas expression on IECs. In this study, we investigated the potential of IL-10 to directly influence Fas expression and Fas-induced IEC apoptosis. Mouse intestinal epithelial cell lines MODE-K and IEC4.1 were cultured with IFN-gamma, TNF-alpha, or anti-Fas monoclonal antibody (mAb) in the presence or absence of IL-10. Fas expression and apoptosis were determined by FACScan analysis of phycoerythrin-anti-Fas mAb staining and annexin V staining, respectively. Treatment with a combination of IFN-gamma and TNF-alpha induced significant apoptosis. Anti-Fas mAb alone did not induce much apoptosis unless cells were pretreated with IFN-gamma and TNF-alpha. These IECs constitutively expressed low levels of Fas, which significantly increased by preincubation of the cells with IFN-gamma and TNF-alpha. Treatment with cytokine or cytokine plus anti-Fas mAb increased apoptosis, which correlated with a decreased Fas-associated death domain IL-1-converting enzyme-like inhibitory protein (FLIP) level, increased caspase-8 activity, and subsequently increased caspase-3 activity. IL-10 diminished both cytokine- and anti-Fas mAb-induced apoptosis, and this was correlated with decreased cytokine-induced Fas expression, increased FLIP, and decreased caspase-8 and caspase-3 activity. In conclusion, IL-10 modulated cytokine induction of Fas expression on IEC cell lines and regulated IEC susceptibility to TNF-alpha, IFN-gamma, and Fas-mediated apoptosis. These findings suggest that IL-10 directly modulates IEC responses to T cell-mediated apoptotic signals.
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Affiliation(s)
- Mantej S Bharhani
- Intestinal Disease Research, Department of Medicine, McMaster University, Hamilton, ON, Canada
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38
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Lee MS, Yoo SA, Cho CS, Suh PG, Kim WU, Ryu SH. Serum Amyloid A Binding to Formyl Peptide Receptor-Like 1 Induces Synovial Hyperplasia and Angiogenesis. THE JOURNAL OF IMMUNOLOGY 2006; 177:5585-94. [PMID: 17015746 DOI: 10.4049/jimmunol.177.8.5585] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Serum amyloid A (SAA) is a major acute-phase reactant, and has been demonstrated to mediate proinflammatory cellular responses. Although SAA has been used as an indicator for a variety of inflammatory diseases, the role of SAA in synovial hyperplasia and proliferation of endothelial cells, a pathological hallmark of rheumatoid arthritis (RA), has yet to be elucidated. In this study, we have demonstrated that SAA promotes the proliferation of human fibroblast-like synoviocytes (FLS). In addition, SAA protects RA FLS against the apoptotic death induced by serum starvation, anti-Fas IgM, and sodium nitroprusside. The activity of SAA appears to be mediated by the formyl peptide receptor-like 1 (FPRL1) receptor, as it was mimicked by the WKYMVm peptide, a specific ligand for FPRL1, but completely abrogated by down-regulating the FPRL1 transcripts with short interfering RNA. The effect of SAA on FLS hyperplasia was shown to be caused by an increase in the levels of intracellular calcium, as well as the activation of ERK and Akt, which resulted in an elevation in the expression of cyclin D1 and Bcl-2. Moreover, SAA stimulated the proliferation, migration, and tube formation of endothelial cells in vitro, and enhanced the sprouting activity of endothelial cells ex vivo and neovascularization in vivo. These observations indicate that the binding of SAA to FPRL1 may contribute to the destruction of bone and cartilage via the promotion of synoviocyte hyperplasia and angiogenesis, thus providing a potential target for the control of RA.
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Affiliation(s)
- Mi-Sook Lee
- Division of Molecular Life Sciences, Pohang University of Science and Technology, Pohang, Korea
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García-Ruiz I, Rodríguez-Juan C, Díaz-Sanjuan T, del Hoyo P, Colina F, Muñoz-Yagüe T, Solís-Herruzo JA. Uric acid and anti-TNF antibody improve mitochondrial dysfunction in ob/ob mice. Hepatology 2006; 44:581-91. [PMID: 16941682 DOI: 10.1002/hep.21313] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The mechanisms responsible for low mitochondrial respiratory chain (MRC) activity in the liver of patients with nonalcoholic steatohepatitis are unknown. In this study, we examined the cause of this dysfunction in ob/ob mice. Forty-six mice were distributed in six groups: group I: C57BL/6J mice; group II: C57BL/6J Lep(-/-) mice (ob/ob); group III, ob/ob mice treated with manganese [III] tetrakis (5,10,15,20 benzoic acid) porphyrin (MnTBAP); group IV, ob/ob mice treated with IgG1 immunoglobulin; group V, ob/ob mice treated with anti-TNF antibody; group VI: ob/ob mice treated with uric acid. In liver tissue, we measured MRC activity, fatty acid beta-oxidation, tumor necrosis factor (TNF), inducible nitric oxide synthase (iNOS), 3-tyrosine-nitrated proteins, 3-tyrosine-nitrated mitochondrial proteins, including cytochrome c and ND4 subunit of complex I. MRC activity was decreased in ob/ob mice. TNF levels, iNOS protein expression, and tyrosine nitrated proteins were markedly increased in the liver of ob/ob mice. In these animals, mitochondrial proteins were markedly tyrosine nitrated, particularly the ND4 subunit of complex I and cytochrome c. Treatment of these animals with uric acid, a peroxynitrite scavenger, anti-TNF antibody, or MnTBAP decreased tyrosine nitrated proteins, improved the activity of MRC complexes, and led to a marked regression of hepatic steatosis and inflammation. In conclusion, MRC dysfunction and liver lesions found in ob/ob mice are likely to reflect the tyrosine nitration of mitochondrial proteins by peroxynitrite or a peroxynitrite-derivate radical. Increased hepatic TNF and iNOS expression might enhance peroxynitrite formation and inhibition of MRC complexes.
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Affiliation(s)
- Inmaculada García-Ruiz
- Research Center, Department of Gastroenterology, Hospital Universitario 12 de Octubre, Avd. Córdoba, Madrid, Spain
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40
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Kim R, Emi M, Tanabe K, Arihiro K. Tumor-driven evolution of immunosuppressive networks during malignant progression. Cancer Res 2006; 66:5527-36. [PMID: 16740684 DOI: 10.1158/0008-5472.can-05-4128] [Citation(s) in RCA: 324] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Tumors evolve mechanisms to escape immune control by a process called immune editing, which provides a selective pressure in the tumor microenvironment that could lead to malignant progression. A variety of tumor-derived factors contribute to the emergence of complex local and regional immunosuppressive networks, including vascular endothelial growth factor, interleukin-10, transforming growth factor-beta, prostaglandin E(2), and soluble phosphatidylserine, soluble Fas, soluble Fas ligand, and soluble MHC class I-related chain A proteins. Although deposited at the primary tumor site, these secreted factors could extend immunosuppressive effects into the local lymph nodes and the spleen, promoting invasion and metastasis. Vascular endothelial growth factors play a key role in recruiting immature myeloid cells from the bone marrow to enrich the microenvironment as tumor-associated immature dendritic cells and tumor-associated macrophages. The understanding of the immunosuppressive networks that evolve is incomplete, but several features are emerging. Accumulation of tumor-associated immature dendritic cells may cause roving dendritic cells and T cells to become suppressed by the activation of indoleamine 2,3-dioxygenase and arginase I by tumor-derived growth factors. Soluble phosphatidylserines support tumor-associated macrophages by stimulating the release of anti-inflammatory mediators that block antitumor immune responses. Soluble Fas, soluble FasL, and soluble MHC class I-related chain A proteins may help tumor cells escape cytolysis by cytotoxic T cells and natural killer cells, possibly by counterattacking immune cells and causing their death. In summary, tumor-derived factors drive the evolution of an immunosuppressive network which ultimately extends immune evasion from the primary tumor site to peripheral sites in patients with cancer.
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Affiliation(s)
- Ryungsa Kim
- International Radiation Information Center, Research Institute for Radiation Biology and Medicine, Hiroshima University, Japan.
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41
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da Silva Correia J, Miranda Y, Austin-Brown N, Hsu J, Mathison J, Xiang R, Zhou H, Li Q, Han J, Ulevitch RJ. Nod1-dependent control of tumor growth. Proc Natl Acad Sci U S A 2006; 103:1840-5. [PMID: 16446438 PMCID: PMC1413646 DOI: 10.1073/pnas.0509228103] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Nod1, a cytosolic protein that senses meso-diaminopimelic acid-containing ligands derived from peptidoglycan, plays a role in host responses to invasive bacteria. Here we describe a function for Nod1, whereby it controls tumor formation. Cell lines derived from the human breast cancer epithelial cell line MCF-7 were used in a severe combined immune deficiency (SCID) mouse xenograft model to characterize a pathway linking Nod1 to the growth of estrogen-sensitive tumors. In MCF-7 cells, the absence of Nod1 correlates with tumor growth, an increased sensitivity to estrogen-induced cell proliferation, and a failure to undergo Nod1-dependent apoptosis. Conversely, overexpression of Nod1 in MCF-7 cells results in inhibition of estrogen-dependent tumor growth and reduction of estrogen-induced proliferative responses in vitro.
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Affiliation(s)
- Jean da Silva Correia
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
| | - Yvonne Miranda
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
| | - Nikki Austin-Brown
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
| | - Jenny Hsu
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
| | - John Mathison
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
| | - Rong Xiang
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
| | - Huamin Zhou
- School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China
| | - Qinxi Li
- School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China
| | - Jiahuai Han
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
| | - Richard J. Ulevitch
- *Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037; and
- To whom correspondence should be addressed. E-mail:
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Frankel SK, Cosgrove GP, Cha SI, Cool CD, Wynes MW, Edelman BL, Brown KK, Riches DWH. TNF-alpha sensitizes normal and fibrotic human lung fibroblasts to Fas-induced apoptosis. Am J Respir Cell Mol Biol 2005; 34:293-304. [PMID: 16272460 PMCID: PMC2644194 DOI: 10.1165/rcmb.2005-0155oc] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Pulmonary accumulation of fibroblasts and myofibroblasts in idiopathic pulmonary fibrosis/usual interstitial pneumonia (IFP/UIP) has been linked to (1) increased migration of a circulating pool of fibrocytes, (2) cell proliferation, and (3) resistance to apoptosis. The mechanism of physiologic apoptosis of lung fibroblasts is poorly understood. Using normal and fibrotic human lung fibroblasts and the human lung fibroblast cell line, MRC-5, we examined the regulation of Fas-induced apoptosis by the proinflammatory cytokines TNF-alpha and IFN-gamma. Herein, we show that the basal resistance of lung fibroblasts and myofibroblasts to Fas-induced apoptosis is overcome by sensitization with TNF-alpha. IFN-gamma did not sensitize cells to Fas-induced apoptosis, but exhibited synergistic activity with TNF-alpha. Sensitization by TNF-alpha was observed in MRC-5 cells and in fibroblasts and myofibroblasts from normal and fibrotic human lung, suggesting that this represents a conserved mechanism to engage Fas-induced apoptosis. The mechanism of sensitization was localized at the level of recruitment of the adapter protein, FADD, to the cytoplasmic domain of Fas. Collectively, these findings suggest that fibroblast apoptosis involves two steps, sensitization and induction, and that inadequate pulmonary inflammation in IPF/UIP may favor fibroblast accumulation by reducing sensitization to apoptosis.
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Affiliation(s)
- Stephen K Frankel
- Program in Cell Biology, Department of Pediatrics, National Jewish Medical and Research Center, Denver, CO 80206, USA
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Longley DB, Wilson TR, McEwan M, Allen WL, McDermott U, Galligan L, Johnston PG. c-FLIP inhibits chemotherapy-induced colorectal cancer cell death. Oncogene 2005; 25:838-48. [PMID: 16247474 DOI: 10.1038/sj.onc.1209122] [Citation(s) in RCA: 147] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
c-FLIP inhibits caspase 8 activation and apoptosis mediated by death receptors such as Fas and DR5. We studied the effect of c-FLIP on the apoptotic response to chemotherapies used in colorectal cancer (CRC) (5-fluorouracil, oxaliplatin and irinotecan). Simultaneous downregulation of both c-FLIP splice forms c-FLIP(L) and c-FLIP(S) with siRNA synergistically enhanced chemotherapy-induced apoptosis in p53 wild-type (HCT116p53(+/+), RKO), null (HCT116p53(-/-)) and mutant (H630) CRC cell lines. Furthermore, overexpression of c-FLIP(L), but not c-FLIP(S), potently inhibited apoptosis induced by chemotherapy in HCT116p53(+/+) cells, suggesting that c-FLIP(L) was the more important splice form in mediating chemoresistance. In support of this, siRNA specifically targeted against c-FLIP(L) synergistically enhanced chemotherapy-induced apoptosis in a manner similar to the siRNA targeted against both splice forms. Inhibition of caspase 8 blocked the enhanced apoptosis induced by c-FLIP-targeted (FT) siRNA and chemotherapy. Furthermore, we found that downregulating cell surface DR5, but not Fas, also inhibited apoptosis induced by FT siRNA and chemotherapy. Interestingly, these effects were not dependent on activation of DR5 by its ligand TRAIL. These results indicate that c-FLIP inhibits TRAIL-independent, DR5- and caspase 8-dependent apoptosis in response to chemotherapy in CRC cells. Moreover, targeting c-FLIP in combination with existing chemotherapies may have therapeutic potential for the treatment of CRC.
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Affiliation(s)
- D B Longley
- Drug Resistance Group, Centre for Cancer Research and Cell Biology, Queen's University Belfast, University Floor, Belfast City Hospital, Lisburn Road, Belfast BT9 7AB, UK.
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Park SM, Kim S, Choi JS, Hur DY, Lee WJ, Lee MS, Choe J, Lee TH. TGF-beta inhibits Fas-mediated apoptosis of a follicular dendritic cell line by down-regulating the expression of Fas and caspase-8: counteracting role of TGF-beta on TNF sensitization of Fas-mediated apoptosis. THE JOURNAL OF IMMUNOLOGY 2005; 174:6169-75. [PMID: 15879113 DOI: 10.4049/jimmunol.174.10.6169] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Follicular dendritic cells (FDC) constitute the framework of germinal center (GC) in secondary lymphoid follicles, and the integrity of FDC networks is critically affected by cytokines present in the GC. We have previously shown that TNF promotes Fas-mediated apoptosis of HK cells, an established FDC-like cell line, by up-regulating Fas expression. However, in the developing GC, FDC death is not a hallmark of GC despite the presence of TNF and FasL. In this study, we report that TGF-beta inhibits Fas-mediated apoptosis of HK cells by down-regulating the expression of surface Fas and caspase-8. The inhibitory effect of TGF-beta can be observed when HK cells were simultaneously treated with TNF and TGF-beta, indicating that TGF-beta counteracts the effect of TNF in sensitizing cells to Fas-mediated apoptosis. Furthermore, the deprivation of TGF-beta by injecting neutralizing TGF-beta Abs to the SRBC-immunized mice resulted in the sporadic appearance of FDC undergoing apoptosis in the lymphoid follicles, suggesting that TGF-beta functions as a naturally occurring inhibitor that rescues FDCs which are predisposed to apoptosis. Our study documents a novel function of TGF-beta in the maintenance of FDC networks.
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Affiliation(s)
- Sun-Mi Park
- Department of Biology and Protein Network Research Center, Yonsei University, Seoul, Korea
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Brooks AD, Sayers TJ. Reduction of the antiapoptotic protein cFLIP enhances the susceptibility of human renal cancer cells to TRAIL apoptosis. Cancer Immunol Immunother 2005; 54:499-505. [PMID: 15614529 PMCID: PMC11034198 DOI: 10.1007/s00262-004-0595-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2004] [Accepted: 07/06/2004] [Indexed: 11/30/2022]
Abstract
Human renal carcinoma cells (RCCs) were sensitized to the apoptotic effects of tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL), by treatment with cycloheximide (CHX). In contrast to a previous study, a rapid and dramatic decrease in levels of cellular FLICE (Fas-associated death domain-like IL-1beta-converting enzyme) inhibitory protein (cFLIP) following cycloheximide treatment was observed in all RCCs studied. The unambiguous detection of this decrease in cFLIP was dependent on the quality of the particular antibody preparation used to detect cFLIP. Cycloheximide treatment caused no major change in levels of pro-caspase-8 or cell surface expression of TRAIL receptors. Therefore, cycloheximide treatment resulted in an increase in the pro-caspase-8 to cFLIP ratio, which correlated with sensitization to TRAIL-mediated apoptosis. Furthermore, treatment of human RCCs with small interfering oligoribonucleotides (siRNA) for cFLIP caused a reduction of cFLIP protein and sensitized cells to TRAIL-mediated apoptosis. We concluded that in the presence of an intact TRAIL signaling pathway, a significant reduction of cFLIP alone is sufficient to sensitize human RCCs to TRAIL apoptosis.
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Affiliation(s)
- Alan D. Brooks
- SAIC-Frederick, National Cancer Institute at Frederick, Bldg. 560, Rm. 31-67, Frederick, MD 21702-1201 USA
| | - Thomas J. Sayers
- SAIC-Frederick, National Cancer Institute at Frederick, Bldg. 560, Rm. 31-67, Frederick, MD 21702-1201 USA
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Palao G, Santiago B, Galindo M, Payá M, Ramirez JC, Pablos JL. Down-regulation of FLIP sensitizes rheumatoid synovial fibroblasts to Fas-mediated apoptosis. ACTA ACUST UNITED AC 2004; 50:2803-10. [PMID: 15457448 DOI: 10.1002/art.20453] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Hyperplasia of fibroblast-like synoviocytes (FLS) contributes to chronic inflammation and joint destruction in rheumatoid arthritis (RA). FLICE-inhibitory protein (FLIP) is an antiapoptotic protein that might prevent apoptotic elimination of FLS in response to death ligands such as tumor necrosis factor alpha (TNFalpha) or Fas ligand, which are present in RA synovium. Previous studies on FLIP expression by osteoarthritis (OA) and RA FLS have shown variable results, and the specific role of FLIP as an apoptosis inhibitor in these cells remains unclear. We undertook this study to investigate the expression and antiapoptotic function of FLIP in FLS. METHODS We studied the expression of FLIP by immunohistochemistry and immunoblotting in synovial tissues or cultured FLS from RA and OA patients. FLS apoptosis was induced by an agonistic anti-Fas monoclonal antibody and FLS were then quantified. We studied the effects of cycloheximide (CHX), TNFalpha, and FLIP antisense oligonucleotide on FLIP expression and FLS apoptotic susceptibility. RESULTS FLIP(L) was the isoform mainly expressed in lining synoviocytes and cultured FLS. Synovial tissues and cultured FLS from OA and RA tissues displayed similar patterns and levels of expression of FLIP. Fas-induced apoptosis was variable in different FLS lines, but differences between OA and RA groups were not detected. TNFalpha induced increases in FLIP(L) and FLIP(S) expression and protected RA FLS from apoptosis, while CHX induced the opposite effects. Down-regulation of FLIP by antisense oligonucleotide strongly sensitized RA FLS to Fas-mediated apoptosis. CONCLUSION Apoptosis susceptibility and FLIP expression are similar in OA and RA FLS. Down-regulation of FLIP sensitizes RA FLS to Fas-mediated apoptosis and may be a valuable tool for targeting RA FLS hyperplasia.
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De Falco M, Fedele V, Cobellis L, Mastrogiacomo A, Leone S, Giraldi D, De Luca B, Laforgia V, De Luca A. Immunohistochemical distribution of proteins belonging to the receptor-mediated and the mitochondrial apoptotic pathways in human placenta during gestation. Cell Tissue Res 2004; 318:599-608. [PMID: 15578274 DOI: 10.1007/s00441-004-0969-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2004] [Accepted: 07/06/2004] [Indexed: 11/29/2022]
Abstract
The balance between cell death and cell proliferation and its regulation are essential features of many physiological processes and are particularly important in fetal morphogenesis and adult tissue homeostasis. Apoptosis is a type of cell suicide that is activated in two main ways: through a receptor-mediated pathway or through a mitochondrial pathway. We have investigated the immunohistochemical distribution of proteins belonging to these two pathways in human placenta during gestation by comparing their expression levels between the first and third trimester of gestation. In the first trimester, the receptor-mediated pathway prevails over the mitochondrial pathway with a moderate/intense expression of its three components, viz., Fas ligand (FasL), Fas, and caspase-8, and weak positivity of anti-apoptotic FLIP, these proteins being mainly localized in the cytotrophoblast compartment. In the third trimester of gestation, there is an increased expression of mitochondrial pathway proteins, viz., Apaf-1 and caspase-9. We have also investigated the expression level of caspase-3, the primary effector caspase of both pathways, and have observed that it is moderately expressed during gestation, being mainly localized in the cytotrophoblast during the first trimester and in both placental compartments during the third trimester of gestation. Thus, both pathways actively function in human placenta to execute cell death. By means of immunoelectron microscopy, we have further shown that, in human placenta, the two proteins of the mitochondrial pathway together with caspase-3 are localized both in the cytoplasm and in the nucleus. In particular, Apaf-1 and caspase-9 are distributed near to the nuclear envelope suggesting an important role for these two proteins in disrupting the nuclear-cytoplasmic barrier.
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Affiliation(s)
- M De Falco
- Department of Evolutive and Comparative Biology, University of Naples "Federico II", Naples, Italy
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Abstract
A better understanding of the mechanisms that contribute to the resistance of synovial macrophages and fibroblasts to apoptosis will not only provide better insights into the mechanisms contributing to the perpetuation of rheumatoid arthritis (RA) but will also help identify targets for the development of novel, more effective, and long-lasting therapies for the treatment of patients with RA. To avoid toxicity, such as the induction of apoptosis of critical organs, the mechanisms by which these molecules are targeted and therapy delivered must be carefully selected, using the insights obtained from studies characterizing the mechanisms that promote chronic inflammation.
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Affiliation(s)
- Hongtao Liu
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, 303 East Chicago Avenue, Chicago, IL 60611, USA
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