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Węglarz-Tomczak E, Talma M, Giurg M, Westerhoff HV, Janowski R, Mucha A. Neutral metalloaminopeptidases APN and MetAP2 as newly discovered anticancer molecular targets of actinomycin D and its simple analogs. Oncotarget 2018; 9:29365-29378. [PMID: 30034623 PMCID: PMC6047675 DOI: 10.18632/oncotarget.25532] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Accepted: 05/14/2018] [Indexed: 01/07/2023] Open
Abstract
The potent transcription inhibitor Actinomycin D is used with several cancers. Here, we report the discovery that this naturally occurring antibiotic inhibits two human neutral aminopeptidases, the cell-surface alanine aminopeptidase and intracellular methionine aminopeptidase type 2. These metallo-containing exopeptidases participate in tumor cell expansion and motility and are targets for anticancer therapies. We show that the peptide portions of Actinomycin D and Actinomycin X2 are not required for effective inhibition, but the loss of these regions changes the mechanism of interaction. Two structurally less complex Actinomycin D analogs containing the phenoxazone chromophores, Questiomycin A and Actinocin, appear to be competitive inhibitors of both aminopeptidases, with potencies similar to the non-competitive macrocyclic parent compound (Ki in the micromolar range). The mode of action for all four compounds and both enzymes was demonstrated by molecular modeling and docking in the corresponding active sites. This knowledge gives new perspectives to Actinomycin D's action on tumors and suggests new avenues and molecules for medical applications.
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Affiliation(s)
- Ewelina Węglarz-Tomczak
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland.,Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam, Amsterdam, The Netherlands
| | - Michał Talma
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland
| | - Mirosław Giurg
- Department of Organic Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland
| | - Hans V Westerhoff
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam, Amsterdam, The Netherlands
| | - Robert Janowski
- Institute of Structural Biology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany
| | - Artur Mucha
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland
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2
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Yu KKH, Taylor JT, Pathmanaban ON, Youshani AS, Beyit D, Dutko-Gwozdz J, Benson R, Griffiths G, Peers I, Cueppens P, Telfer BA, Williams KJ, McBain C, Kamaly-Asl ID, Bigger BW. High content screening of patient-derived cell lines highlights the potential of non-standard chemotherapeutic agents for the treatment of glioblastoma. PLoS One 2018; 13:e0193694. [PMID: 29499065 PMCID: PMC5834163 DOI: 10.1371/journal.pone.0193694] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 02/19/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Glioblastoma (GBM) is the most common primary brain malignancy in adults, yet survival outcomes remain poor. First line treatment is well established, however disease invariably recurs and improving prognosis is challenging. With the aim of personalizing therapy at recurrence, we have established a high content screening (HCS) platform to analyze the sensitivity profile of seven patient-derived cancer stem cell lines to 83 FDA-approved chemotherapy drugs, with and without irradiation. METHODS Seven cancer stem cell lines were derived from patients with GBM and, along with the established cell line U87-MG, each patient-derived line was cultured in tandem in serum-free conditions as adherent monolayers and three-dimensional neurospheres. Chemotherapeutics were screened at multiple concentrations and cells double-stained to observe their effect on both cell death and proliferation. Sensitivity was classified using high-throughput algorithmic image analysis. RESULTS Cell line specific drug responses were observed across the seven patient-derived cell lines. Few agents were seen to have radio-sensitizing effects, yet some drug classes showed a marked difference in efficacy between monolayers and neurospheres. In vivo validation of six drugs suggested that cell death readout in a three-dimensional culture scenario is a more physiologically relevant screening model and could be used effectively to assess the chemosensitivity of patient-derived GBM lines. CONCLUSION The study puts forward a number of non-standard chemotherapeutics that could be useful in the treatment of recurrent GBM, namely mitoxantrone, bortezomib and actinomycin D, whilst demonstrating the potential of HCS to be used for personalized treatment based on the chemosensitivity profile of patient tumor cells.
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Affiliation(s)
- Kenny Kwok-Hei Yu
- Brain Tumour Research Group, Stem Cell and Neurotherapies Laboratory, Division of Cell Matrix Biology & Regenerative Medicine, University of Manchester, Manchester, United Kingdom
| | - Jessica T. Taylor
- Brain Tumour Research Group, Stem Cell and Neurotherapies Laboratory, Division of Cell Matrix Biology & Regenerative Medicine, University of Manchester, Manchester, United Kingdom
| | - Omar N. Pathmanaban
- Manchester Centre for Clinical Neurosciences, Salford Royal Hospital, Manchester Academic Health Sciences Centre, Salford, United Kingdom
| | - Amir Saam Youshani
- Brain Tumour Research Group, Stem Cell and Neurotherapies Laboratory, Division of Cell Matrix Biology & Regenerative Medicine, University of Manchester, Manchester, United Kingdom
| | - Deniz Beyit
- Imagen Therapeutics, Manchester, United Kingdom
| | | | | | | | - Ian Peers
- Inferstats Consulting, Alderley Park, Biohub, Cheshire, United Kingdom
| | - Peter Cueppens
- Inferstats Consulting, Alderley Park, Biohub, Cheshire, United Kingdom
| | - Brian A. Telfer
- Division of Pharmacy & Optometry, School of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Kaye J. Williams
- Division of Pharmacy & Optometry, School of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Catherine McBain
- Department of Clinical Oncology, The Christie NHS FT, Manchester, United Kingdom
| | - Ian D. Kamaly-Asl
- Children’s Brain Tumour Research Network (CBTRN), Royal Manchester Children’s Hospital, Manchester, United Kingdom
- Department of Neurosurgery, Royal Manchester Children’s Hospital, Manchester Academic Health Sciences Centre, Manchester, United Kingdom
| | - Brian W. Bigger
- Brain Tumour Research Group, Stem Cell and Neurotherapies Laboratory, Division of Cell Matrix Biology & Regenerative Medicine, University of Manchester, Manchester, United Kingdom
- * E-mail:
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3
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Dong Z, Lei Q, Yang R, Zhu S, Ke XX, Yang L, Cui H, Yi L. Inhibition of neurotensin receptor 1 induces intrinsic apoptosis via let-7a-3p/Bcl-w axis in glioblastoma. Br J Cancer 2017; 116:1572-1584. [PMID: 28494471 PMCID: PMC5518855 DOI: 10.1038/bjc.2017.126] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 02/10/2017] [Accepted: 04/11/2017] [Indexed: 12/12/2022] Open
Abstract
Backgroud: Glioblastoma is a kind of highly malignant and aggressive tumours in the central nervous system. Previously, we found that neurotensin (NTS) and its high-affinity receptor 1 (NTSR1) had essential roles in cell proliferation and invasiveness of glioblastoma. Unexpectedly, cell death also appeared by inhibition of NTSR1 except for cell cycle arrest. However, the mechanisms were remained to be further explored. Methods: Cells treated with SR48692, a selective antagonist of NTSR1, or NTSR1 shRNA were stained with Annexin V-FITC/PI and the apoptosis was assessed by flow cytometry. Cytochrome c release was detected by using immunofluorescence. Mitochondrial membrane potential (MMP, ΔΨm) loss was stained by JC-1 and detected by immunofluorescence or flow cytometry. Apoptosis antibody array and microRNA microarray were performed to seek the potential regulators of NTSR1 inhibition-induced apoptosis. Interaction between let-7a-3p and Bcl-w 3′UTR was evaluated by using luciferase assay. Results: SR48692 induced massive apoptosis, which was related to mitochondrial cytochrome c release and MMP loss. Knockdown of NTSR1 induced slight apoptosis and significant MMP loss. In addition, NTSR1 inhibition sensitised glioblastoma cells to actinomycin D or doxorubicin-induced apoptosis. Consistently, NTSR1 inhibition-induced mitochondrial apoptosis was accompanied by downregulation of Bcl-w and Bcl-2. Restoration of Bcl-w partly rescued NTSR1 deficiency-induced apoptosis. In addition, NTSR1 deficiency promoted higher let-7a-3p expression and inhibition let-7a-3p partly rescued NTSR1 inhibition-induced apoptosis. In addition, let-7a-3p inhibition promoted 3′UTR activities of Bcl-w and the expression of c-Myc and LIN28, which were the upstream of let-7a-3p, decreased after NTSR1 inhibition. Conclusions: NTSR1 had an important role in protecting glioblastoma from intrinsic apoptosis via c-Myc/LIN28/let-7a-3p/Bcl-w axis.
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Affiliation(s)
- Zhen Dong
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Qian Lei
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Rui Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Shunqin Zhu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Xiao-Xue Ke
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Liqun Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Hongjuan Cui
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China
| | - Liang Yi
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.,Department of Neurosurgery, Daping Hospital, the Third Military Medical University, Chongqing 400042, China
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4
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dos Santos AF, Terra LF, Wailemann RAM, Oliveira TC, Gomes VDM, Mineiro MF, Meotti FC, Bruni-Cardoso A, Baptista MS, Labriola L. Methylene blue photodynamic therapy induces selective and massive cell death in human breast cancer cells. BMC Cancer 2017; 17:194. [PMID: 28298203 PMCID: PMC5353937 DOI: 10.1186/s12885-017-3179-7] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 03/08/2017] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Breast cancer is the main cause of mortality among women. The disease presents high recurrence mainly due to incomplete efficacy of primary treatment in killing all cancer cells. Photodynamic therapy (PDT), an approach that causes tissue destruction by visible light in the presence of a photosensitizer (Ps) and oxygen, appears as a promising alternative therapy that could be used adjunct to chemotherapy and surgery for curing cancer. However, the efficacy of PDT to treat breast tumours as well as the molecular mechanisms that lead to cell death remain unclear. METHODS In this study, we assessed the cell-killing potential of PDT using methylene blue (MB-PDT) in three breast epithelial cell lines that represent non-malignant conditions and different molecular subtypes of breast tumours. Cells were incubated in the absence or presence of MB and irradiated or not at 640 nm with 4.5 J/cm2. We used a combination of imaging and biochemistry approaches to assess the involvement of classical autophagic and apoptotic pathways in mediating the cell-deletion induced by MB-PDT. The role of these pathways was investigated using specific inhibitors, activators and gene silencing. RESULTS We observed that MB-PDT differentially induces massive cell death of tumour cells. Non-malignant cells were significantly more resistant to the therapy compared to malignant cells. Morphological and biochemical analysis of dying cells pointed to alternative mechanisms rather than classical apoptosis. MB-PDT-induced autophagy modulated cell viability depending on the cell model used. However, impairment of one of these pathways did not prevent the fatal destination of MB-PDT treated cells. Additionally, when using a physiological 3D culture model that recapitulates relevant features of normal and tumorous breast tissue morphology, we found that MB-PDT differential action in killing tumour cells was even higher than what was detected in 2D cultures. CONCLUSIONS Finally, our observations underscore the potential of MB-PDT as a highly efficient strategy which could use as a powerful adjunct therapy to surgery of breast tumours, and possibly other types of tumours, to safely increase the eradication rate of microscopic residual disease and thus minimizing the chance of both local and metastatic recurrence.
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Affiliation(s)
- Ancély F. dos Santos
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Letícia F. Terra
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Rosangela A. M. Wailemann
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Talita C. Oliveira
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Vinícius de Morais Gomes
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Marcela Franco Mineiro
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Flávia Carla Meotti
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Alexandre Bruni-Cardoso
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Maurício S. Baptista
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
| | - Leticia Labriola
- Biochemistry Department, Chemistry Institute, University of São Paulo, São Paulo, 05508-000 SP Brazil
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A [Lys49]phospholipase A2fromProtobothrops flavoviridisVenom Induces Caspase-Independent Apoptotic Cell Death Accompanied by Rapid Plasma-Membrane Rupture in Human Leukemia Cells. Biosci Biotechnol Biochem 2014; 75:864-70. [DOI: 10.1271/bbb.100783] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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6
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Chen Y, Liu J, Yuan B, Cao C, Qin S, Cao X, Bian G, Wang Z, Jiang J. Methylated actinomycin D, a novel actinomycin D analog induces apoptosis in HepG2 cells through Fas- and mitochondria-mediated pathways. Mol Carcinog 2012; 52:983-96. [DOI: 10.1002/mc.21943] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 05/11/2012] [Accepted: 06/26/2012] [Indexed: 01/15/2023]
Affiliation(s)
- Yongqiang Chen
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Jinjuan Liu
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Bo Yuan
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Chengliang Cao
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Sheng Qin
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Xiaoying Cao
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Guangkai Bian
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Zhe Wang
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
| | - Jihong Jiang
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province; Xuzhou Normal University; Xuzhou China
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7
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Jin C, Wu S, Lu X, Liu Q, Zhang L, Yang J, Xi Q, Cai Y. Conditioned medium from actinomycin D-treated apoptotic cells induces mitochondria-dependent apoptosis in bystander cells. Toxicol Lett 2012; 211:45-53. [PMID: 22421271 DOI: 10.1016/j.toxlet.2012.02.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 02/25/2012] [Accepted: 02/27/2012] [Indexed: 10/28/2022]
Abstract
Chemical-induced bystander effects have been known for several years, but the underlying mechanism is still seldom investigated. Previous researchers have found that mitomycin C and phleomycin induced micronuclei in bystander cells the same as in exposed cells. We previously demonstrated the ability of actinomycin D (ACTD) to induce bystander effects in normal Chinese hamster fibroblast V79 cells and found that conditioned medium (CM) obtained from ACTD-exposed apoptotic cells induced apoptosis in bystander cells. The present study further explores the probable mechanism of apoptosis in bystander cells. The main findings of this study are: (1) ACTD-treated CM induced apoptosis in bystander cells in a time-dependent manner, which was confirmed with morphological changes. (2) ACTD-treated CM increased the mRNA and protein levels of pro-apoptotic p53 and Bax, whereas it decreased those of anti-apoptotic Bcl-2 in bystander cells; these were all time-dependent effects. Reactive oxygen species (ROS) were also involved in apoptosis of bystander cells. (3) ACTD-treated CM reduced mitochondria membrane potential and induced cytochrome c release. (4) ACTD-treated CM induced G1 cell phase arrest, which may be another response in bystander cells when cultured with CM. These results suggest that chemical-treated CM induces p53-Bcl-2/Bax-cytochrome c signaling (i.e., mitochondria pathway)-dependent apoptosis in bystander cells, which is a kinetic response.
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Affiliation(s)
- Cuihong Jin
- Department of Toxicology, School of Public Health, China Medical University, Shenyang 110001, PR China
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8
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Abstract
Sensitivity of skeletal muscle to pro-apoptotic factors
In mononuclear cells, apoptosis leads to DNA fragmentation and cell destruction, regardless of the activated pathway. As regards multinuclear cells, e.g. skeletal muscle fibers, apoptosis rarely induces the death of the entire cell, and it generally affects single nuclei. This process, referred to as nuclear apoptosis, has a negative effect on the expression of genes in the myonuclear domain. Apoptosis may be initiated in muscle cells by external stimuli which activate cell membrane death receptors as well as by internal stimuli which stimulate the mitochondrial release of pro-apoptotic proteins. Reactive oxygen species also play an important role in the initiation of apoptosis. In muscle cells, ROS are produced in response to extracellular reactions or by cell mitochondria. It is, therefore, believed that mitochondria play a central role in apoptosis within skeletal muscle. Skeletal muscles have a well-developed system that protects them against oxidative damage. Myogenic stem cells are an integral part of multinucleated myofibers, and they are critically important for the maintenance of normal muscle mass, muscle growth, regeneration and hypertrophy. The latest research results indicate that myogenic cells are more sensitive to oxidative stress and pro-apoptotic factors than well-differentiated cells, such as myotubes. The complex structure and activity of skeletal muscle prompted research into the role of apoptosis and its intensity under various physiological and pathological conditions. This review summarizes the results of research investigating control mechanisms and the apoptosis process in skeletal muscle fibers, and indicates unresearched areas where further work is required.
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9
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Induction of the bystander effect in Chinese hamster V79 cells by actinomycin D. Toxicol Lett 2011; 202:178-85. [DOI: 10.1016/j.toxlet.2011.02.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Revised: 01/31/2011] [Accepted: 02/01/2011] [Indexed: 11/23/2022]
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10
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Sick E, Boukhari A, Deramaudt T, Rondé P, Bucher B, André P, Gies JP, Takeda K. Activation of CD47 receptors causes proliferation of human astrocytoma but not normal astrocytes via an Akt-dependent pathway. Glia 2011; 59:308-19. [PMID: 21125662 DOI: 10.1002/glia.21102] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
CD47 is a membrane receptor that plays pivotal roles in many pathophysiological processes, including infection, inflammation, cell spreading, proliferation, and apoptosis. We show that activation of CD47 increases proliferation of human U87 and U373 astrocytoma cells but not normal astrocytes. CD47 function-blocking antibodies inhibit proliferation of untreated U87 and U373 cells but not normal astrocytes, suggesting that CD47 may be constitutively activated in astrocytoma. CD47 expression levels were similar in our three cell types. CD47 couples to G-proteins in astrocytes and astrocytoma and especially to the Gβγ dimer. Downstream signaling following CD47 activation involves Gβγ dimer-dependent activation of the PI3K/Akt pathway in astrocytoma cells but not in normal astrocytes. This pathway is known to be deregulated in astrocytoma, leading to cell proliferation and enhanced survival signals. Putative PLIC-1 interaction with CD47 in astrocytoma cells but not astrocytes may contribute to the proliferative effect observed upon activation of CD47. Our data indicate that CD47 receptors have a stimulatory role in cell proliferation and demonstrate for the first time that CD47 signals via the PI3K/Akt pathway in cancerous cells but not normal cells.
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Affiliation(s)
- Emilie Sick
- Université de Strasbourg, CNRS UMR 7213-Pharmacologie, Faculté de Pharmacie, 74 rte du Rhin, Illkirch, France.
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11
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Shim D, Kang HY, Jeon BW, Kang SS, Chang SI, Kim HY. Protein kinase B inhibits apoptosis induced by actinomycin D in ECV304 cells through phosphorylation of caspase 8. Arch Biochem Biophys 2004; 425:214-20. [PMID: 15111130 DOI: 10.1016/j.abb.2004.03.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2004] [Revised: 03/17/2004] [Indexed: 10/26/2022]
Abstract
Actinomycin D (act-D) anchors itself into DNA-base pairs by intercalation and thereby inhibits mRNA synthesis. It has been well established that act-D elicits apoptosis in various cell types involving endothelial cells. However, the regulatory mechanisms of actinomycin D-induced apoptotic cell death still remain unclear. Here, we investigated apoptotic cell death and its underlying regulatory mechanisms elicited by actinomycin D in ECV304. Act-D induced typical apoptotic features including chromatin condensation and translocation of phosphatidylserine. Since the phosphoinositide 3-OH kinase (PI3K)/protein kinase B (PKB) signaling pathway has been shown to prevent apoptosis in various cell types, it was of interest to determine if this pathway could protect against apoptosis induced by act-D. Inhibition of PI3K/PKB significantly increased act-D-induced apoptosis. Moreover, act-D-induced cell death was physiologically linked to PKB-mediated cell survival through caspase-8. These results suggest that cross-talk between the PKB and caspase-8 pathways may regulate the balance between cell survival and cell death in ECV304.
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Affiliation(s)
- Donghwan Shim
- Division of Life Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea
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12
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Hegde M, Roscoe J, Cala P, Gorin F. Amiloride Kills Malignant Glioma Cells Independent of Its Inhibition of the Sodium-Hydrogen Exchanger. J Pharmacol Exp Ther 2004; 310:67-74. [PMID: 15010500 DOI: 10.1124/jpet.103.065029] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Previously, we demonstrated that malignant glioma cell lines have increased intracellular pH (pHi) as a result of increased activities of the type I sodium/hydrogen exchanger (NHE1). This alkalotic pHi of 7.2 to 7.4 is favorable for augmented glycolysis, DNA synthesis, and cell cycle progression. Conversely, reductions in pHi have been associated with reduced rates of proliferation in transformed cell types. The effects of reducing pHi directly and by NHE1 inhibition on human malignant glioma cells were systematically compared with those on primary rat astrocytes. Neither cariporide, nor direct acidification to pHi 6.9 altered the proliferative rates or viabilities of human U87 or U118 malignant glioma cell lines. However, amiloride significantly impaired glioma cell proliferation and viability while not affecting astrocytes at concentrations (500 microM) that exceeded its inhibition of NHE1 in glioma cells (IC50 = 17 microM). Preventing a reduction of pHi did not alter the drug's antiproliferative and cytotoxic effects on glioma cells. These findings indicated that amiloride's cytotoxic effects on glioma cells are independent of its ability to inhibit NHE1 or to reduce intracellular pHi. The amiloride derivative 2,4 dichlorobenzamil (DCB) inhibits the sodium-calcium exchanger (NCX) and was both antiproliferative and cytotoxic to glioma cells at low doses (20 microM). By contrast, KB-R7943 [(2-[2-[4-nitrobenzyloxy]phenyl]ethyl)-isothioureamethanesulfonate] preferentially blocks sodium-dependent calcium influx by NCX (reverse mode) and was nontoxic to glioma cells. It is proposed that DCB (20 microM) and amiloride (500 microM) impair calcium efflux by NCX, leading to elevations of intracellular calcium that initiate a morphologically necrotic, predominantly caspase-independent glioma cell death.
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Affiliation(s)
- Manu Hegde
- Department of Neurology, School of Medicine, University of California Davis, Davis, California 95616, USA
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13
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Abstract
AIM: To study the effect of staurosporine (ST) on the cell cycle of human gastric cancer cell lines MGC803 and SGC7901.
METHODS: Cell proliferation was evaluated by trypan blue dye exclusion method. Apoptotic morphology was observed under a transmission electron microscope. Changes of cell cycle and apoptotic peaks of cells were determined by flow cytometry. Expression of P21WAF1 gene was examined using immunohistochemistry and RT-PCR.
RESULTS: The growth of MGC803 and SGC7901 cells was inhibited by ST. The inhibitory concentrations against 50% cells (IC50) at 24 h and 48 h were 54 ng/ml and 23 ng/ml for MGC803, and 61 ng/ml and 37 ng/ml for SGC7901. Typical apoptotic bodies and apoptotic peaks were observed 24 h after cells were treated wth ST at a concentration of 200 ng/ml. The percentage of cells at G0/G1 phase was decreased and that of cells at G2/M was increased significantly in the group treated wth ST at the concentrations of 40 ng/ml, 60 ng/ml, 100 ng/ml for 24 h, compared with the control group (P < 0.01). The expression levels of P21WAF1 gene in both MGC803 and SGC7901 cells were markedly up-regulated after treatment with ST.
CONCLUSION: ST can cause arrest of gastric cancer cells at G2/M phase, which may be one of the mechanisms that inhibit cell proliferation and cause apoptosis in these cells. Effect of ST on cells at G2/M phase may be attributed to the up-regulattion of P21WAF1 gene.
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Affiliation(s)
- Min-Wen Ha
- Cancer Institute of the First Affiliated Hospital of China Medical University, 155 Northern Nanjing Street, Heping District, Shenyang 110001, Liaoning Province, China
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14
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Hostanska K, Reichling J, Bommer S, Weber M, Saller R. Hyperforin a constituent of St John's wort (Hypericum perforatum L.) extract induces apoptosis by triggering activation of caspases and with hypericin synergistically exerts cytotoxicity towards human malignant cell lines. Eur J Pharm Biopharm 2003; 56:121-32. [PMID: 12837490 DOI: 10.1016/s0939-6411(03)00046-8] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Hyperforin (HP) is an abundant component of St John's wort with antibiotic and antidepressive activity. We report here the ability of HP and that of polyphenolic procyanidin B2 (PB-2) to inhibit the growth of leukemia K562 and U937 cells, brain glioblastoma cells LN229 and normal human astrocytes. HP inhibited the growth of cells in vitro with GI(50) values between 14.9 and 19.9 microM. The growth inhibitory effect of PB-2 was more pronounced in leukemia cell lines K562 and U937, the GI(50) concentrations being about 12.5 microM established after 48 h incubation differed significantly (P<0.05) from those of LN229 and normal human astrocytes (103.1 and 96.7 microM), respectively. Further, HP and hypericin (HY) (a naphthodianthrone from St John's wort) acted synergistically in their inhibitory effect on leukemic (K562, U937) cell growth. Cell death occurred after 24 h treatment with HP and PB-2 by apoptosis. A dose-dependent loss of membrane phospholipid asymmetry associated with apoptosis was induced in all cell lines as evidenced by the externalization of phosphatidylserine (PS) and morphological changes in cell size and granulosity by scatter characteristics. In leukemia U937 cells, HP increased the activity of caspase-9 and caspase-3 and in K562 cells caspase-8 and caspase-3. In addition, the broad spectrum caspase inhibitor z-VAD-fmk inhibited both the appearance of PS exposure and the activation of caspases, illustrating the functional relevance of caspase activation during HP-induced apoptosis. Cytocidal effects of HP and its cooperation with HY on tumor growth inhibition in a synergistic manner make the St John's wort an interesting option in cancer warranting further in vitro and in vivo investigation.
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Affiliation(s)
- Katarina Hostanska
- Department of Internal Medicine, University Hospital Zurich, Zurich, Switzerland.
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15
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Guensberg P, Wacheck V, Lucas T, Monia B, Pehamberger H, Eichler HG, Jansen B. Bcl-xL antisense oligonucleotides chemosensitize human glioblastoma cells. Chemotherapy 2002; 48:189-95. [PMID: 12218266 DOI: 10.1159/000063873] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Resistance to chemotherapy in glioblastoma has been linked to the expression of antiapoptotic Bcl-2 family members including Bcl-xL. METHODS Bcl-xL expression was specifically reduced in M059K glioblastoma cells with antisense oligonucleotides (ISIS 16009, ISIS 16967) as assessed by Western blotting. Induction of apoptosis by treatment with antisense oligonucleotides in combination with paclitaxel in cell culture was monitored by WST-1 assays and flow cytometric analysis. RESULTS Antisense oligonucleotide-mediated reduction of Bcl-xL levels led to enhanced cytotoxicity in M059K cells when compared to the use of a mismatch control oligonucleotide (p < 0.001). A decreased threshold for the induction of apoptosis led to significantly enhanced cytotoxic responses to paclitaxel treatment in WST-1 assays (p < 0.001) and flow cytometric analyses. CONCLUSION Combination treatment using Bcl-xL antisense oligonucleotides and paclitaxel may qualify as a promising strategy to ultimately improve the clinical outcome of glioblastoma.
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Affiliation(s)
- Patrick Guensberg
- Department of Clinical Pharmacology, Section of Experimental Oncology/Molecular Pharmacology, University of Vienna, Vienna, Austria
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16
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Uemura T, Moritake K, Akiyama Y, Kimura Y, Shingu T, Yamasaki T. Experimental validation of deuterium oxide-mediated antitumoral activity as it relates to apoptosis in murine malignant astrocytoma cells. J Neurosurg 2002; 96:900-8. [PMID: 12005398 DOI: 10.3171/jns.2002.96.5.0900] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Deuterium oxide (D2O), or heavy water, affects a variety of biological activities different from those of water. The authors examined the antitumoral effect of D2O on brain neoplasms and demonstrated D2O-mediated cytotoxicity by using a Rous sarcoma virus-induced murine malignant astrocytoma cell line, RSVM. The mechanism of the observed cytotoxicity may involve D2O-induced apoptosis and cell-cycle modulation. METHODS The authors performed an assay with methylthiazol tetrazolium bromide and a trypan blue dye exclusion test to confirm in vitro D2O-mediated cytotoxicity for RSVM cells. At D2O concentrations of 10 to 50%, the cytotoxic effect was dose and time dependent. Flow cytometry analysis revealed programmed cell death (apoptosis) and the accumulation of RSVM cells during the G2/M phase. By applying the terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling method, fluorescein isothiocyanate-annexin V and propidium iodide double staining, and caspase-family protease activity analysis, the authors demonstrated both DNA fragmentation and enhancement of caspase activity after a 48-hour treatment with D2O, thus indicating that D2O induces apoptosis in RSVM cells. Apoptotic DNA fragmentation was completely abolished by the caspase inhibitor Z-VAD-FMK (benzyloxycarbonil-Val-Ala-Aps-fluoromethylketone). The findings indicate that the caspase activation pathway may be involved in D2Oinduced apoptosis. CONCLUSIONS The authors found that D2O is cytotoxic to malignant astrocytoma cells. The mechanism of D2O-mediated cytotoxicity involved the induction of apoptosis and cell accumulation during the G2/M phase. This D2O-induced apoptosis is modulated through the caspase activation pathway.
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Affiliation(s)
- Takeshi Uemura
- Department of Neurosurgery, Shimane Medical University, Izumo, Japan.
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17
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Hendrich C, Nöth U, Stahl U, Merklein F, Rader CP, Schütze N, Thull R, Tuan RS, Eulert J. Testing of skeletal implant surfaces with human fetal osteoblasts. Clin Orthop Relat Res 2002:278-89. [PMID: 11795745 DOI: 10.1097/00003086-200201000-00033] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The effect of standard orthopaedic implant materials on osteoblast proliferation and differentiation was investigated using a human osteoblast cell culture system. Human fetal osteoblasts 1.19 were cultured on stainless steel, cobalt-chrome-molybdenum, and commercially pure titanium for 12 days. Tissue culture polystyrene was used as a control. Cell proliferation was measured by electronic cell counting and by a colorimetric proliferation assay. To assess the degree of differentiation, levels of alkaline phosphatase activity, collagen Type I, and osteocalcin production were measured. Osteocalcin gene expression was measured by reverse transcriptase-polymerase chain reaction. Electronic cell counting and proliferation assays showed lower cell numbers and delayed proliferation on stainless steel and cobalt-chrome-molybdenum compared with titanium and polystyrene. Alkaline phosphatase and osteocalcin were measured higher on titanium than on stainless steel or cobalt-chrome-molybdenum. Differences in collagen Type I production were not found. Reverse transcriptase-polymerase chain reaction showed the highest osteocalcin gene expression on titanium. The human fetal osteoblast cell line 1.19 provides a rapidly proliferating and differentiating system for testing biomaterials in which differences in osteoblast proliferation and differentiation on orthopaedic implant materials could be revealed, suggesting that the chemistry of biomaterials has a dynamic effect on proliferation and differentiation of human osteoblasts.
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Affiliation(s)
- Christian Hendrich
- Department of Orthopaedic Surgery, Julius Maximilians University, Würzburg, Germany
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18
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Rabkin SW. Prevention of Staurosporine-Induced Cell Death in Embryonic Chick Cardiomyocyte Is More Dependent on Caspase-2 Than Caspase-3 Inhibition and Is Independent of Sphingomyelinase Activation and Ceramide Generation. Arch Biochem Biophys 2001; 390:119-27. [PMID: 11368523 DOI: 10.1006/abbi.2001.2350] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Apoptosis was induced in embryonic chick cardiomyocytes by staurosporine. Treatment of cardiomyocytes with the preferential caspase-2 inhibitor, z-VDVAD-fmk (100 microM), produced a significant (P < 0.05) although small reduction in the amount of cell death. Ac-DVED-cmk (100 microM), which preferentially inhibits caspase-3 but inhibits to a lesser extent caspase-6, -7, -8, and -10, produced a minimal decrease in cell death. The combination of the caspase-3 and -2 inhibitors produced an additive reduction in cell death after staurosporine (1 microM for 6 h) from 80.4 +/- 0.7 to 54.6 +/- 1.3%. The ability of staurosporine to activate caspase-3 was confirmed in these cardiomyocytes by measurement of caspase-3 activity. A role for ceramide formation, from sphingomyelin to induce caspase activation was unlikely, as there were no changes in cellular ceramide or sphingomyelin after staurosporine treatment of cardiomyocytes when sphingomyelin was labeled by [(3)H]palmitate for 24 h. Neither were there any changes in sphingomyelinase activity. While staurosporine effectively suppressed PKC activity, phorbol 12-myristate 13 acetate did not alter staurosporine-induced cell death or DNA fragmentation. These results demonstrate that, in this model of cardiac cell death, caspase-2 inhibition is of considerable importance, caspase-3 inhibition is of lesser significance but may produce additional effects in the combination with caspase-2 inhibition, and ceramide production from sphingomyelin is not operative in the pathway leading to caspase activation and cell death.
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Affiliation(s)
- S W Rabkin
- University of British Columbia, Vancouver, British Columbia, Canada.
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