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Sheridan R, Brennan K, Bazou D, O’Gorman P, Matallanas D, Mc Gee MM. Multiple Myeloma Derived Extracellular Vesicle Uptake by Monocyte Cells Stimulates IL-6 and MMP-9 Secretion and Promotes Cancer Cell Migration and Proliferation. Cancers (Basel) 2024; 16:1011. [PMID: 38473370 PMCID: PMC10930391 DOI: 10.3390/cancers16051011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/14/2024] [Accepted: 02/16/2024] [Indexed: 03/14/2024] Open
Abstract
Multiple Myeloma (MM) is an incurable haematological malignancy caused by uncontrolled growth of plasma cells. MM pathogenesis is attributed to crosstalk between plasma cells and the bone marrow microenvironment, where extracellular vesicles (EVs) play a role. In this study, EVs secreted from a panel of MM cell lines were isolated from conditioned media by ultracentrifugation and fluorescently stained EVs were co-cultured with THP-1 monocyte cells. MM EVs from three cell lines displayed a differential yet dose-dependent uptake by THP-1 cells, with H929 EVs displaying the greatest EV uptake compared to MM.1s and U266 EVs suggesting that uptake efficiency is dependent on the cell line of origin. Furthermore, MM EVs increased the secretion of MMP-9 and IL-6 from monocytes, with H929 EVs inducing the greatest effect, consistent with the greatest uptake efficiency. Moreover, monocyte-conditioned media collected following H929 EV uptake significantly increased the migration and proliferation of MM cells. Finally, EV proteome analysis revealed differential cargo enrichment that correlates with disease progression including a significant enrichment of spliceosome-related proteins in H929 EVs compared to the U266 and MM.1s EVs. Overall, this study demonstrates that MM-derived EVs modulate monocyte function to promote tumour growth and metastasis and reveals possible molecular mechanisms involved.
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Affiliation(s)
- Rebecca Sheridan
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland (K.B.)
| | - Kieran Brennan
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland (K.B.)
| | - Despina Bazou
- Department of Haematology, Mater Misericordiae University Hospital, D07 R2WY Dublin, Ireland; (D.B.)
- School of Medicine, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland
| | - Peter O’Gorman
- Department of Haematology, Mater Misericordiae University Hospital, D07 R2WY Dublin, Ireland; (D.B.)
| | - David Matallanas
- Systems Biology Ireland, School of Medicine, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland;
| | - Margaret M. Mc Gee
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland (K.B.)
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland
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2
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García-Posadas L, Romero-Castillo I, Brennan K, Mc Gee MM, Blanco-Fernández A, Diebold Y. Isolation and Characterization of Human Conjunctival Mesenchymal Stromal Cells and Their Extracellular Vesicles. Invest Ophthalmol Vis Sci 2023; 64:38. [PMID: 37747402 PMCID: PMC10528583 DOI: 10.1167/iovs.64.12.38] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 09/01/2023] [Indexed: 09/26/2023] Open
Abstract
Purpose The purpose of this study was to isolate and culture human conjunctival mesenchymal stromal cells (Conj-MSCs) from cadaveric donor tissue, and to obtain and characterize their extracellular vesicles (EVs) and their effect on conjunctival epithelium. Methods Stromal cells isolated from cadaveric donor conjunctival tissues were cultured and analyzed to determine whether they could be defined as MSCs. Expression of MSC markers was analyzed by flow cytometry. Cells were cultured in adipogenic, osteogenic, and chondrocyte differentiation media, and stained with Oil Red, Von Kossa, and Toluidine Blue, respectively, to determine multipotent capacity. EVs were isolated from cultured Conj-MSCs by differential ultracentrifugation. EV morphology was evaluated by atomic force microscopy, size distribution analyzed by dynamic light scattering, and EVs were individually characterized by nanoflow cytometry. The effect of EVs on oxidative stress and viability was analyzed in in vitro models using the conjunctival epithelial cell line IM-HConEpiC. Results Cultured stromal cells fulfilled the criteria of MSCs: adherence to plastic; expression of CD90 (99.95 ± 0.03% positive cells), CD105 (99.04 ± 1.43%), CD73 (99.99 ± 0.19%), CD44 (99.93 ± 0.05%), and absence of CD34, CD11b, CD19, CD45 and HLA-DR (0.82 ± 0.91%); and in vitro differentiation into different lineages. Main Conj-MSC EV subpopulations were round, small EVs that expressed CD9, CD63, CD81, and CD147. Conj-MSC EVs significantly decreased the production of reactive oxygen species in IM-HConEpiCs exposed to H2O2 in similar levels than adipose tissue-MSC-derived EVs and ascorbic acid, used as controls. Conclusions It is possible to isolate human Conj-MSCs from cadaveric tissue, and to use these cells as a source of small EVs with antioxidant activity on conjunctival epithelial cells.
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Affiliation(s)
- Laura García-Posadas
- Ocular Surface Group, Instituto Universitario de Oftalmobiología Aplicada (IOBA), Universidad de Valladolid, Valladolid, Spain
| | - Ismael Romero-Castillo
- Ocular Surface Group, Instituto Universitario de Oftalmobiología Aplicada (IOBA), Universidad de Valladolid, Valladolid, Spain
| | - Kieran Brennan
- School of Biomolecular & Biomedical Science, Conway Institute of Biomolecular & Biomedical Research, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Margaret M. Mc Gee
- School of Biomolecular & Biomedical Science, Conway Institute of Biomolecular & Biomedical Research, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Alfonso Blanco-Fernández
- Flow Cytometry Core Technology, Conway Institute, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Yolanda Diebold
- Ocular Surface Group, Instituto Universitario de Oftalmobiología Aplicada (IOBA), Universidad de Valladolid, Valladolid, Spain
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Instituto de Salud Carlos III, Madrid, Spain
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3
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Gorry RL, Brennan K, Lavin PTM, Mazurski T, Mary C, Matallanas D, Guichou JF, Mc Gee MM. Cyclophilin A Isomerisation of Septin 2 Mediates Abscission during Cytokinesis. Int J Mol Sci 2023; 24:11084. [PMID: 37446263 DOI: 10.3390/ijms241311084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/21/2023] [Accepted: 06/24/2023] [Indexed: 07/15/2023] Open
Abstract
The isomerase activity of Cyclophilin A is important for midbody abscission during cell division, however, to date, midbody substrates remain unknown. In this study, we report that the GTP-binding protein Septin 2 interacts with Cyclophilin A. We highlight a dynamic series of Septin 2 phenotypes at the midbody, previously undescribed in human cells. Furthermore, Cyclophilin A depletion or loss of isomerase activity is sufficient to induce phenotypic Septin 2 defects at the midbody. Structural and molecular analysis reveals that Septin 2 proline 259 is important for interaction with Cyclophilin A. Moreover, an isomerisation-deficient EGFP-Septin 2 proline 259 mutant displays defective midbody localisation and undergoes impaired abscission, which is consistent with data from cells with loss of Cyclophilin A expression or activity. Collectively, these data reveal Septin 2 as a novel interacting partner and isomerase substrate of Cyclophilin A at the midbody that is required for abscission during cytokinesis in cancer cells.
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Affiliation(s)
- Rebecca L Gorry
- School of Biomolecular and Biomedical Science (SBBS), Conway Institute, University College Dublin, D04 V1W8 Dublin, Ireland
| | - Kieran Brennan
- School of Biomolecular and Biomedical Science (SBBS), Conway Institute, University College Dublin, D04 V1W8 Dublin, Ireland
| | - Paul T M Lavin
- School of Biomolecular and Biomedical Science (SBBS), Conway Institute, University College Dublin, D04 V1W8 Dublin, Ireland
| | - Tayler Mazurski
- School of Biomolecular and Biomedical Science (SBBS), Conway Institute, University College Dublin, D04 V1W8 Dublin, Ireland
| | - Charline Mary
- Centre de Biologie Structurale, CNRS, INSERM, University Montpellier, 34090 Montpellier, France
| | - David Matallanas
- Systems Biology Ireland (SBI), School of Medicine, University College Dublin, D04 V1W8 Dublin, Ireland
| | - Jean-François Guichou
- Centre de Biologie Structurale, CNRS, INSERM, University Montpellier, 34090 Montpellier, France
| | - Margaret M Mc Gee
- School of Biomolecular and Biomedical Science (SBBS), Conway Institute, University College Dublin, D04 V1W8 Dublin, Ireland
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4
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Gorry R, Brennan K, Lavin PTM, Sheridan R, Mc Gee MM. Phosphorylation of the prolyl isomerase Cyclophilin A regulates its localisation and release from the centrosome during mitosis. Cell Cycle 2023; 22:951-966. [PMID: 36691345 PMCID: PMC10054169 DOI: 10.1080/15384101.2023.2167430] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 11/30/2022] [Indexed: 01/25/2023] Open
Abstract
The centrosome acts as a protein platform from which proteins are deployed to function throughout the cell cycle. Previously, we have shown that the prolyl isomerase Cyclophilin A (CypA) localizes to the centrosome in interphase and re-localizes to the midbody during mitosis where it functions in cytokinesis. In this study, investigation of CypA by SDS-PAGE during the cell cycle reveals that it undergoes a mobility shift during mitosis, indicative of a post-translational modification, which may correlate with its subcellular re-localization. Due to the lack of a phospho-specific antibody, we used site-directed mutagenesis to demonstrate that the previously identified serine 77 phosphorylation site within CypA is important for control of CypA centrosome localization. Furthermore, CypA is shown to interact with the mitotic NIMA-related kinase 2 (Nek2) during interphase and mitosis, while also interacting with the Nek2-antagonist PP1 during interphase but not during mitosis, suggesting a potential role for the Nek2-PP1 complex in CypA phospho-regulation. In support of this, Nek2 is capable of phosphorylating CypA in vitro. Overall, this work reveals that phosphorylation of CypA at serine 77 is important for its release from the centrosome during mitosis and may be regulated by the activity of Nek2 and PP1 during the cell cycle.
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Affiliation(s)
- Rebecca Gorry
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Ireland
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Ireland
| | - Kieran Brennan
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Ireland
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Ireland
| | - Paul TM Lavin
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Ireland
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Ireland
| | - Rebecca Sheridan
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Ireland
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Ireland
| | - Margaret M Mc Gee
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Ireland
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Ireland
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5
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Brennan K, Iversen KF, Blanco-Fernández A, Lund T, Plesner T, Mc Gee MM. Extracellular Vesicles Isolated from Plasma of Multiple Myeloma Patients Treated with Daratumumab Express CD38, PD-L1, and the Complement Inhibitory Proteins CD55 and CD59. Cells 2022; 11:3365. [PMID: 36359760 PMCID: PMC9658084 DOI: 10.3390/cells11213365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 10/14/2022] [Accepted: 10/20/2022] [Indexed: 09/26/2023] Open
Abstract
Daratumumab (DARA) has improved the outcome of treatment of multiple myeloma (MM). DARA acts via complement-dependent and -independent mechanisms. Resistance to DARA may result from upregulation of the complement inhibitory proteins CD55 and CD59, downregulation of the DARA target CD38 on myeloma cells or altered expression of the checkpoint inhibitor ligand programmed death ligand-1 (PD-L1) or other mechanisms. In this study, EVs were isolated from peripheral blood (PB) and bone marrow (BM) from multiple myeloma (MM) patients treated with DARA and PB of healthy controls. EV size and number and the expression of CD38, CD55, CD59 and PD-L1 as well as the EV markers CD9, CD63, CD81, CD147 were determined by flow cytometry. Results reveal that all patient EV samples express CD38, PD-L1, CD55 and CD59. The level of CD55 and CD59 are elevated on MM PB EVs compared with healthy controls, and the level of PD-L1 on MM PB EVs is higher in patients responding to treatment with DARA. CD147, a marker of various aspects of malignant behaviour of cancer cells and a potential target for therapy, was significantly elevated on MM EVs compared with healthy controls. Furthermore, mass spectrometry data suggests that MM PB EVs bind DARA. This study reveals a MM PB and BM EV protein signature that may have diagnostic and prognostic value.
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Affiliation(s)
- Kieran Brennan
- School of Biomolecular & Biomedical Science, University College Dublin (UCD), Dublin 4, Ireland
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), Dublin 4, Ireland
| | - Katrine F. Iversen
- Institute of Regional Health Science, University of Southern Denmark, 7100 Vejle, Denmark
- Department of Internal Medicine, Section of Hematology, Lillebaelt Hospital, University Hospital of Southern Denmark, 7100 Vejle, Denmark
| | - Alfonso Blanco-Fernández
- Flow Cytometry Core Technology, UCD Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Thomas Lund
- Department of Hematology, Odense University Hospital, 5000 Odense, Denmark
| | - Torben Plesner
- Institute of Regional Health Science, University of Southern Denmark, 7100 Vejle, Denmark
- Department of Internal Medicine, Section of Hematology, Lillebaelt Hospital, University Hospital of Southern Denmark, 7100 Vejle, Denmark
| | - Margaret M. Mc Gee
- School of Biomolecular & Biomedical Science, University College Dublin (UCD), Dublin 4, Ireland
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), Dublin 4, Ireland
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6
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Wu Y, Brennan K, Fernández AB, Mc Gee MM. Cyclophilin A regulates secretion of tumour-derived extracellular vesicles. Transl Oncol 2021; 14:101112. [PMID: 33984826 PMCID: PMC8131927 DOI: 10.1016/j.tranon.2021.101112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 01/06/2023] Open
Abstract
Blood cancer EVs stimulate pro-inflammatory immune signals. Cyclophilin A is a core EV protein and is localised in high density blood cancer derived EVs. Cyclophilin A regulates biogenesis and/or release of EVs with a diameter of 100 to 200 nm.
Extracellular Vesicles (EVs) are a heterogenous population of particles that play an important role in cell-cell communication in physiological and pathophysiological situations. In this study we reveal that the peptidyl prolyl isomerase Cyclophilin A (CypA) is enriched in cancer-derived EVs from a range of haematopoietic malignancies. CypA-enriched blood cancer EVs were taken up by normal monocytes independent of EV surface trypsin-sensitive proteins and potently stimulated pro-inflammatory MMP9 and IL-6 secretion. Further characterisation revealed that CypA is intravesicular, however, it is not present in all EVs derived from the haematopoietic cells, instead, it is predominantly located in high density EVs with a range of 1.15–1.18 g/ml. Furthermore, loss of CypA expression in haematological cancer cells attenuates high density EV-induced pro-inflammatory MMP9 and IL-6 secretion from monocytes. Mechanistically, we reveal that homozygous loss or siRNA knockdown of CypA expression significantly reduced the secretion of EVs in the range of 100–200 nm from blood cancer cells under normal and hypoxic conditions. Overall, this work reveals a novel role for CypA in cancer cell EV biogenesis.
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Affiliation(s)
- Yunjie Wu
- UCD School of Biomolecular & Biomedical Science, Conway Institute, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Kieran Brennan
- UCD School of Biomolecular & Biomedical Science, Conway Institute, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Alfonso Blanco Fernández
- Flow Cytometry Core Technology, Conway Institute, University College Dublin (UCD), Belfield, Dublin 4, Ireland
| | - Margaret M Mc Gee
- UCD School of Biomolecular & Biomedical Science, Conway Institute, University College Dublin (UCD), Belfield, Dublin 4, Ireland.
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7
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Dhanda AS, Lulic KT, Vogl AW, Mc Gee MM, Chiu RH, Guttman JA. Listeria Membrane Protrusion Collapse: Requirement of Cyclophilin A for Listeria Cell-to-Cell Spreading. J Infect Dis 2018; 219:145-153. [DOI: 10.1093/infdis/jiy255] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 05/01/2018] [Indexed: 01/18/2023] Open
Affiliation(s)
- Aaron S Dhanda
- Department of Biological Sciences, Centre for Cell Biology, Development, and Disease, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Katarina T Lulic
- Department of Biological Sciences, Centre for Cell Biology, Development, and Disease, Simon Fraser University, Burnaby, British Columbia, Canada
| | - A Wayne Vogl
- Department of Cellular and Physiological Sciences, Faculty of Medicine, University of British Columbia, Vancouver, Canada
| | - Margaret M Mc Gee
- School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Ireland
| | - Robert H Chiu
- Dental and Craniofacial Research Institute and School of Dentistry, University of California, Los Angeles
- Surgical Oncology and Jonsson Comprehensive Cancer Center, University of California, Los Angeles
| | - Julian A Guttman
- Department of Biological Sciences, Centre for Cell Biology, Development, and Disease, Simon Fraser University, Burnaby, British Columbia, Canada
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8
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Abstract
Cyclophilins belong to a group of proteins that possess peptidyl prolyl isomerase activity and catalyse the cis-trans conversion of proline peptide bonds. Cyclophilin members play important roles in protein folding and as molecular chaperones, in addition to a well-established role as host factors required for completion of the virus life cycle. Members of the cyclophilin family are overexpressed in a range of human malignancies including hepatocellular cancer, pancreatic cancer, nonsmall cell lung cancer, gastric cancer, colorectal cancer and glioblastoma multiforme, however, their precise role in tumourigenesis remains unclear. In recent years, mounting evidence supports a role for prolyl isomerisation during mammalian cell division; a process with striking similarity to plasma membrane remodelling during virus replication. Here, we summarise our current understanding of the role of cyclophilins in cancer. We review the function of cyclophilins during mammalian cell division and during HIV-1 infection, and highlight common processes involving members of the ESCRT and Rab GTPase families.
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Affiliation(s)
| | - Margaret M Mc Gee
- UCD School of Biomolecular & Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.
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9
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Casey JP, Brennan K, Scheidel N, McGettigan P, Lavin PT, Carter S, Ennis S, Dorkins H, Ghali N, Blacque OE, Mc Gee MM, Murphy H, Lynch SA. Recessive NEK9 mutation causes a lethal skeletal dysplasia with evidence of cell cycle and ciliary defects. Hum Mol Genet 2016; 25:1824-35. [PMID: 26908619 DOI: 10.1093/hmg/ddw054] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 02/15/2016] [Indexed: 01/05/2023] Open
Abstract
Skeletal dysplasias are a clinically and genetically heterogeneous group of bone and cartilage disorders. Whilst >450 skeletal dysplasias have been reported, 30% are genetically uncharacterized. We report two Irish Traveller families with a previously undescribed lethal skeletal dysplasia characterized by fetal akinesia, shortening of all long bones, multiple contractures, rib anomalies, thoracic dysplasia, pulmonary hypoplasia and protruding abdomen. Single nucleotide polymorphism homozygosity mapping and whole exome sequencing identified a novel homozygous stop-gain mutation in NEK9 (c.1489C>T; p.Arg497*) as the cause of this disorder. NEK9 encodes a never in mitosis gene A-related kinase involved in regulating spindle organization, chromosome alignment, cytokinesis and cell cycle progression. This is the first disorder to be associated with NEK9 in humans. Analysis of NEK9 protein expression and localization in patient fibroblasts showed complete loss of full-length NEK9 (107 kDa). Functional characterization of patient fibroblasts showed a significant reduction in cell proliferation and a delay in cell cycle progression. We also provide evidence to support possible ciliary associations for NEK9. Firstly, patient fibroblasts displayed a significant reduction in cilia number and length. Secondly, we show that the NEK9 orthologue in Caenorhabditis elegans, nekl-1, is almost exclusively expressed in a subset of ciliated cells, a strong indicator of cilia-related functions. In summary, we report the clinical and molecular characterization of a lethal skeletal dysplasia caused by NEK9 mutation and suggest that this disorder may represent a novel ciliopathy.
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Affiliation(s)
- Jillian P Casey
- Clinical Genetics, Children's University Hospital, Temple Street, Dublin 1, Ireland, UCD Academic Centre on Rare Diseases, School of Medicine and Medical Sciences,
| | - Kieran Brennan
- UCD School of Biomolecular & Biomedical Science, Conway Institute
| | - Noemie Scheidel
- UCD School of Biomolecular & Biomedical Science, Conway Institute
| | - Paul McGettigan
- UCD Academic Centre on Rare Diseases, School of Medicine and Medical Sciences, UCD School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland
| | - Paul T Lavin
- UCD School of Biomolecular & Biomedical Science, Conway Institute
| | - Stephen Carter
- UCD School of Biomolecular & Biomedical Science, Conway Institute
| | - Sean Ennis
- UCD Academic Centre on Rare Diseases, School of Medicine and Medical Sciences
| | - Huw Dorkins
- North West Thames Regional Genetics Service, Northwick Park Hospital, London North West Healthcare NHS Trust, Watford Road, Harrow HA1 3UJ, UK, Leicestershire Genetics Service, Leicester Royal Infirmary, Leicester LE1 5WW, UK, St Peter's College, University of Oxford, Oxford OX1 2DL, UK and
| | - Neeti Ghali
- North West Thames Regional Genetics Service, Northwick Park Hospital, London North West Healthcare NHS Trust, Watford Road, Harrow HA1 3UJ, UK
| | - Oliver E Blacque
- UCD School of Biomolecular & Biomedical Science, Conway Institute
| | | | - Helen Murphy
- Manchester Academic Health Science Centre, Genetic Medicine-University of Manchester, St Mary's Hospital, Manchester, UK
| | - Sally Ann Lynch
- Clinical Genetics, Children's University Hospital, Temple Street, Dublin 1, Ireland, UCD Academic Centre on Rare Diseases, School of Medicine and Medical Sciences
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10
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Annibali D, Whitfield JR, Favuzzi E, Jauset T, Serrano E, Cuartas I, Redondo-Campos S, Folch G, Gonzàlez-Juncà A, Sodir NM, Massó-Vallés D, Beaulieu ME, Swigart LB, Mc Gee MM, Somma MP, Nasi S, Seoane J, Evan GI, Soucek L. Myc inhibition is effective against glioma and reveals a role for Myc in proficient mitosis. Nat Commun 2014; 5:4632. [PMID: 25130259 PMCID: PMC4143920 DOI: 10.1038/ncomms5632] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 07/09/2014] [Indexed: 12/21/2022] Open
Abstract
Gliomas are the most common primary tumours affecting the adult central nervous system and respond poorly to standard therapy. Myc is causally implicated in most human tumours and the majority of glioblastomas have elevated Myc levels. Using the Myc dominant negative Omomyc, we previously showed that Myc inhibition is a promising strategy for cancer therapy. Here, we preclinically validate Myc inhibition as a therapeutic strategy in mouse and human glioma, using a mouse model of spontaneous multifocal invasive astrocytoma and its derived neuroprogenitors, human glioblastoma cell lines, and patient-derived tumours both in vitro and in orthotopic xenografts. Across all these experimental models we find that Myc inhibition reduces proliferation, increases apoptosis and remarkably, elicits the formation of multinucleated cells that then arrest or die by mitotic catastrophe, revealing a new role for Myc in the proficient division of glioma cells. Myc has been implicated in the development of multiple types of cancer. Here, the authors explore the therapeutic potential and mechanism of action of Myc inhibition in mouse and human models of glioblastoma, an aggressive type of tumour that is often resistant to conventional therapy.
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Affiliation(s)
- Daniela Annibali
- 1] Department of Pathology, Helen Diller Family Comprehensive Cancer Center, University of California at San Francisco, San Francisco, California 94143, USA [2] Istituto di Biologia, Medicina Molecolare e NanoBiotecnologie, C.N.R., Dipartimento di Biologia e Biotecnologie, Università La Sapienza, 00185 Rome, Italy [3]
| | - Jonathan R Whitfield
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain [3]
| | - Emilia Favuzzi
- Istituto di Biologia, Medicina Molecolare e NanoBiotecnologie, C.N.R., Dipartimento di Biologia e Biotecnologie, Università La Sapienza, 00185 Rome, Italy
| | - Toni Jauset
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Erika Serrano
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Isabel Cuartas
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Sara Redondo-Campos
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Gerard Folch
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Alba Gonzàlez-Juncà
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Nicole M Sodir
- 1] Department of Pathology, Helen Diller Family Comprehensive Cancer Center, University of California at San Francisco, San Francisco, California 94143, USA [2] Department of Biochemistry, Sanger Building, University of Cambridge, Cambridge CB2 1QW, UK
| | - Daniel Massó-Vallés
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Marie-Eve Beaulieu
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
| | - Lamorna B Swigart
- Department of Pathology, Helen Diller Family Comprehensive Cancer Center, University of California at San Francisco, San Francisco, California 94143, USA
| | - Margaret M Mc Gee
- UCD School of Biomolecular &Biomedical Science, UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
| | - Maria Patrizia Somma
- Istituto di Biologia, Medicina Molecolare e NanoBiotecnologie, C.N.R., Dipartimento di Biologia e Biotecnologie, Università La Sapienza, 00185 Rome, Italy
| | - Sergio Nasi
- Istituto di Biologia, Medicina Molecolare e NanoBiotecnologie, C.N.R., Dipartimento di Biologia e Biotecnologie, Università La Sapienza, 00185 Rome, Italy
| | - Joan Seoane
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain [3] Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
| | - Gerard I Evan
- Department of Biochemistry, Sanger Building, University of Cambridge, Cambridge CB2 1QW, UK
| | - Laura Soucek
- 1] Vall d'Hebron Institute of Oncology (VHIO), Edifici Mediterrània, Hospital Vall d'Hebron, 08035 Barcelona, Spain [2] Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain
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11
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Bannon JH, O'Donovan DS, Kennelly SME, Mc Gee MM. The peptidyl prolyl isomerase cyclophilin A localizes at the centrosome and the midbody and is required for cytokinesis. Cell Cycle 2012; 11:1340-53. [PMID: 22421161 DOI: 10.4161/cc.19711] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Failed cytokinesis leads to tetraploidy, which is an important intermediate preceding aneuploidy and the onset of tumorigenesis. The centrosome is required for the completion of cytokinesis through the transport of important components to the midbody; however, the identity of molecular components and the mechanism involved remains poorly understood. In this study, we report that the peptidyl prolyl isomerase cyclophilin A (cypA) is a centrosome protein that undergoes cell cycle-dependent relocation to the midzone and midbody during cytokinesis in Jurkat cells implicating a role during division. Depletion of cypA does not disrupt mitotic spindle formation or progression through anaphase; however, it leads to cytokinesis defects through an inability to resolve intercellular bridges, culminating in delayed or failed cytokinesis. Defective cytokinesis is also evident by an increased prevalence of midbody-arrested cells. Expression of wild-type cypA reverses the cytokinesis defect in knockout cells, whereas an isomerase mutant does not, indicating that the isomerisation activity of cypA is required for cytokinesis. In contrast, wild-type cypA and the isomerase mutant localize to the centrosome and midbody, suggesting that localization to these structures is independent of isomerase activity. Depletion of cypA also generates tetraploid cells and supernumerary centrosomes. Finally, colony formation in soft agar is impaired in cypA-knockout cells, suggesting that cypA confers clonogenic advantage on tumor cells. Collectively, this data reveals a novel role for cypA isomerase activity in the completion of cytokinesis and the maintenance of genome stability.
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Affiliation(s)
- John H Bannon
- School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin, Ireland
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12
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Mac Fhearraigh S, Mc Gee MM. Cyclin B1 interacts with the BH3-only protein Bim and mediates its phosphorylation by Cdk1 during mitosis. Cell Cycle 2011; 10:3886-96. [PMID: 22071694 DOI: 10.4161/cc.10.22.18020] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Protracted mitotic arrest leads to cell death; however, the molecular signals that link these distinct processes remain poorly understood. Here we report that the pro-apoptotic BH3-only family member Bim undergoes phosphorylation in K562 cells following treatment with the microtubule targeting agents Taxol and Nocodazole. The phosphorylation of two Bim isoforms, BimEL and BimL, at the mitochondria correlates with mitotic arrest and precedes cell death induced by Taxol. It was also found that Bim undergoes transient phosphorylation during normal mitosis in K562 cells. In addition, siRNA silencing of Bim reduces sensitivity to Taxol-induced cell death. The transition of K562 cells from mitosis to G1 results in the loss of BimEL and BimL phosphorylation and correlates with the degradation of cyclin B1. The Cdk1 inhibitors, RO-3306 and Purvalanol A, block Bim phosphorylation in mitotically arrested cells. Importantly, it was found that cyclin B1 co-immunoprecipitates with endogenous Bim in mitotic extracts. Furthermore, active recombinant Cdk1/cyclin B1 phosphorylates BimEL and BimL in vitro and Serine 44 on BimL has been identified as a Cdk1 phosphorylation site. Collectively, these results suggest that Cdk1/cyclin B1-dependent hyper-phosphorylation of Bim during prolonged mitotic arrest is an important cell death signal.
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Affiliation(s)
- Seán Mac Fhearraigh
- School of Biomolecular and Biomedical Science, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, Ireland
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13
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O'Connor AE, Mc Gee MM, Likar Y, Ponomarev V, Callanan JJ, O'shea DF, Byrne AT, Gallagher WM. Mechanism of cell death mediated by a BF2-chelated tetraaryl-azadipyrromethene photodynamic therapeutic: dissection of the apoptotic pathway in vitro and in vivo. Int J Cancer 2011; 130:705-15. [PMID: 21413012 DOI: 10.1002/ijc.26073] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 03/02/2011] [Indexed: 11/07/2022]
Abstract
Photodynamic therapy (PDT) is an established treatment modality for cancer. ADPM06 is an emerging non-porphyrin PDT agent which has been specifically designed for therapeutic application. Recently, we have demonstrated that ADPM06-PDT is well tolerated in vivo and elicits impressive complete response rates in various models of cancer when a short drug-light interval is applied. Herein, the mechanism of action of ADPM06-PDT in vitro and in vivo is outlined. Using a drug and light combination that reduces the clonogenicity of MDA-MB-231 cells by >90%, we detected a well-orchestrated apoptotic response accompanied by the activation of various caspases in vitro. The generation of reactive oxygen species (ROS) upon photosensitizer irradiation was found to be the key instigator in the observed apoptotic response, with the endoplasmic reticulum (ER) found to be the intracellular site of initial PDT damage, as determined by induction of a rapid ER stress response post-PDT. PDT-induced apoptosis was also found to be independent of p53 tumor suppressor status. A robust therapeutic response in vivo was demonstrated, with a substantial reduction in tumor proliferation observed, as well as a rapid induction of apoptosis and initiation of ER stress, mirroring numerous aspects of the mechanism of action of ADPM06 in vitro. Finally, using a combination of (18) F-labeled 3'-deoxy-3'-fluorothymidine ((18) F-FLT) nuclear and optical imaging, a considerable decrease in tumor proliferation over 24-hr in two models of human cancer was observed. Taken together, this data clearly establishes ADPM06 as an exciting novel PDT agent with significant potential for further translational development.
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Affiliation(s)
- Aisling E O'Connor
- UCD School of Biomolecular and Biomedical Science, UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
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14
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Bane FT, Bannon JH, Pennington SR, Campiani G, Williams DC, Zisterer DM, Mc Gee MM. The Microtubule-Targeting Agents, PBOX-6 [Pyrrolobenzoxazepine 7-[(dimethylcarbamoyl)oxy]-6-(2-naphthyl)pyrrolo-[2,1-d] (1,5)-benzoxazepine] and Paclitaxel, Induce Nucleocytoplasmic Redistribution of the Peptidyl-Prolyl Isomerases, Cyclophilin A and Pin1, in Malignant Hematopoietic Cells. J Pharmacol Exp Ther 2009; 329:38-47. [DOI: 10.1124/jpet.108.148130] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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15
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Mulligan JM, Greene LM, Cloonan S, Mc Gee MM, Onnis V, Campiani G, Fattorusso C, Lawler M, Williams DC, Zisterer DM. Identification of tubulin as the molecular target of proapoptotic pyrrolo-1,5-benzoxazepines. Mol Pharmacol 2006; 70:60-70. [PMID: 16571652 DOI: 10.1124/mol.105.021204] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We have demonstrated previously that certain members of a series of novel pyrrolo-1,5-benzoxazepine (PBOX) compounds potently induce apoptosis in a variety of human chemotherapy-resistant cancer cell lines and in primary ex vivo material derived from cancer patients. A better understanding of the molecular mechanisms underlying the apoptotic effects of these PBOX compounds is essential to their development as antineoplastic therapeutic agents. This study sought to test the hypothesis that proapoptotic PBOX compounds target the microtubules. We show that a representative proapoptotic PBOX compound, PBOX-6, induces apoptosis in both the MCF-7 and K562 cell lines. An accumulation of cells in G2/M precedes apoptosis in response to PBOX-6. PBOX-6 induces prometaphase arrest and causes an accumulation of cyclin B1 levels and activation of cyclin B1/CDK1 kinase in a manner similar to that of two representative antimicrotubule agents, nocodazole and paclitaxel. Indirect immunofluorescence demonstrates that both PBOX-6 and another pro-apoptotic PBOX compound, PBOX-15, cause microtubule depolymerization in MCF-7 cells. They also inhibit the assembly of purified tubulin in vitro, whereas a nonapoptotic PBOX compound (PBOX-21) has no effect on either the cellular microtubule network or on the assembly of purified tubulin. This suggests that the molecular target of the pro-apoptotic PBOX compounds is tubulin. PBOX-6 does not bind to either the vinblastine or the colchicine binding site on tubulin, suggesting that it binds to an as-yet-uncharacterised novel site on tubulin. The ability of PBOX-6 to bind tubulin and cause microtubule depolymerization confirms it as a novel candidate for antineoplastic therapy.
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Affiliation(s)
- Jude M Mulligan
- School of Biochemistry and Immunology, Trinity College, Dublin 2, Ireland
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16
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Mc Gee MM, Gemma S, Butini S, Ramunno A, Zisterer DM, Fattorusso C, Catalanotti B, Kukreja G, Fiorini I, Pisano C, Cucco C, Novellino E, Nacci V, Williams DC, Campiani G. Pyrrolo[1,5]benzoxa(thia)zepines as a new class of potent apoptotic agents. Biological studies and identification of an intracellular location of their drug target. J Med Chem 2005; 48:4367-77. [PMID: 15974589 DOI: 10.1021/jm049402y] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have recently developed five novel pyrrolo-1,5-benzoxazepines as proapoptotic agents. Their JNK-dependent induction of apoptosis in tumor cells suggested their potential as novel anticancer agents. The core structure of the apoptotic agent 6 was investigated, and the SARs were expanded with the design and synthesis of several analogues. To define the apoptotic mechanism of the new compounds and the localization of their drug target, two analogues of 6 were designed and synthesized to delineate events leading to JNK activation. The cell-penetrating compound 16 induced apoptosis in tumor cells, while its nonpenetrating analogue, 17, was incapable of inducing apoptosis or activating JNK. Plasma membrane permeabilization of tumor cells resulted in 17-induced JNK activation, suggesting that the pyrrolo-1,5-benzoxazepine molecular target is intracellular. Interestingly, compound 6 displayed cytotoxic activity against a panel of human tumor cell lines but demonstrated negligible toxicity in vivo with no effect on the animals' hematology parameters.
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17
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Mc Gee MM, Greene LM, Ledwidge S, Campiani G, Nacci V, Lawler M, Williams DC, Zisterer DM. Selective induction of apoptosis by the pyrrolo-1,5-benzoxazepine 7-[[dimethylcarbamoyl]oxy]-6-(2-naphthyl)pyrrolo-[2,1-d] (1,5)-benzoxazepine (PBOX-6) in Leukemia cells occurs via the c-Jun NH2-terminal kinase-dependent phosphorylation and inactivation of Bcl-2 and Bcl-XL. J Pharmacol Exp Ther 2004; 310:1084-95. [PMID: 15143129 DOI: 10.1124/jpet.104.067561] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Overexpression of the Bcl-2 proto-oncogene in tumor cells confers resistance against chemotherapeutic drugs. In this study, we describe how the novel pyrrolo-1,5-benzoxazepine compound 7-[[dimethylcarbamoyl]oxy]-6-(2-naphthyl)pyrrolo-[2,1-d] (1,5)-benzoxazepine (PBOX-6) selectively induces apoptosis in Bcl-2-overexpressing cancer cells, whereas it shows no cytotoxic effect on normal peripheral blood mononuclear cells. PBOX-6 overcomes Bcl-2-mediated resistance to apoptosis in chronic myelogenous leukemia (CML) K562 cells by the time- and dose-dependent phosphorylation and inactivation of antiapoptotic Bcl-2 family members Bcl-2 and Bcl-XL. PBOX-6 also induces Bcl-2 phosphorylation and apoptosis in wild-type T leukemia CEM cells and cells overexpressing Bcl-2. This is in contrast to chemotherapeutic agents such as etoposide, actinomycin D, and ultraviolet irradiation, whereby overexpression of Bcl-2 confers resistance against apoptosis. In addition, PBOX-6 induces Bcl-2 phosphorylation and apoptosis in wild-type Jurkat acute lymphoblastic leukemia cells and cells overexpressing Bcl-2. However, Jurkat cells containing a Bcl-2 triple mutant, whereby the principal Bcl-2 phosphorylation sites are mutated to alanine, demonstrate resistance against Bcl-2 phosphorylation and apoptosis. PBOX-6 also induces the early and transient activation of c-Jun NH2-terminal kinase (JNK) in CEM cells. Inhibition of JNK activity prevents Bcl-2 phosphorylation and apoptosis, implicating JNK in the upstream signaling pathway leading to Bcl-2 phosphorylation. Collectively, these findings identify Bcl-2 phosphorylation and inactivation as a critical step in the apoptotic pathway induced by PBOX-6 and highlight its potential as an effective antileukemic agent.
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18
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Mc Gee MM, Campiani G, Ramunno A, Nacci V, Lawler M, Williams DC, Zisterer DM. Activation of the c-Jun N-terminal kinase (JNK) signaling pathway is essential during PBOX-6-induced apoptosis in chronic myelogenous leukemia (CML) cells. J Biol Chem 2002; 277:18383-9. [PMID: 11856743 DOI: 10.1074/jbc.m112058200] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The mitogen-activated protein (MAP) kinase family is activated in response to a wide variety of external stress signals such as UV irradiation, heat shock, and many chemotherapeutic drugs and leads to the induction of apoptosis. A novel series of pyrrolo-1,5-benzoxazepines have been shown to potently induce apoptosis in chronic myelogenous leukemia (CML) cells, which are resistant to many chemotherapeutic agents. In this study we have delineated part of the mechanism by which a representative compound known as PBOX-6 induces apoptosis. We have investigated whether PBOX-6 induces activation of MAP kinase signaling pathways in CML cells. Treatment of K562 cells with PBOX-6 resulted in the transient activation of two JNK isoforms, JNK1 and JNK2. In contrast, PBOX-6 did not activate the extracellular signal-regulated kinase (ERK) or p38. Apoptosis was found to occur independently of the small GTPases Ras, Rac, and Cdc42 but involved phosphorylation of the JNK substrates, c-Jun and ATF-2. Pretreatment of K562 cells with the JNK inhibitor, dicoumarol, abolished PBOX-6-induced phosphorylation of c-Jun and ATF-2 and inhibited the induced apoptosis, suggesting that JNK activation is an essential component of the apoptotic pathway induced by PBOX-6. Consistent with this finding, transfection of K562 cells with the JNK scaffold protein, JIP-1, inhibited JNK activity and apoptosis induced by PBOX-6. JIP-1 specifically scaffolds JNK, MKK7, and members of the mixed-lineage kinase (MLK) family, implicating these kinases upstream of JNK in the apoptotic pathway induced by PBOX-6 in K562 cells.
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Mc Gee MM, Hyland E, Campiani G, Ramunno A, Nacci V, Zisterer DM. Caspase-3 is not essential for DNA fragmentation in MCF-7 cells during apoptosis induced by the pyrrolo-1,5-benzoxazepine, PBOX-6. FEBS Lett 2002; 515:66-70. [PMID: 11943196 DOI: 10.1016/s0014-5793(02)02440-7] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Effector caspases-3, -6 and -7 are responsible for producing the morphological features associated with apoptosis, such as DNA fragmentation. The present study demonstrates that a member of a novel series of pyrrolo-1,5-benzoxazepines, PBOX-6, induces apoptosis in MCF-7 cells, which lack caspase-3. Apoptosis was accompanied by DNA fragmentation and the activation of caspase-7, but not caspases-3 and -6. Inhibition of caspase-7 activity reduced the extent of apoptosis induced, indicating that activation of caspase-7 is involved in the mechanism by which PBOX-6 induces apoptosis in MCF-7 cells. This study suggests that caspase-3 is not necessarily essential for DNA fragmentation and the morphological changes associated with apoptosis.
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Mc Gee MM, Campiani G, Ramunno A, Fattorusso C, Nacci V, Lawler M, Williams DC, Zisterer DM. Pyrrolo-1,5-Benzoxazepines Induce Apoptosis in Chronic Myeloid Leukemia (CML) Cells by Bypassing the Apoptotic Suppressor BCR-ABL. ScientificWorldJournal 2001; 1:109. [PMID: 30147592 PMCID: PMC6084525 DOI: 10.1100/tsw.2001.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- Margaret M Mc Gee
- Biochemistry of Department Trinity College, Dublin 2, Ireland.,Department of Biochemistry Trinity College, Dublin, Ireland
| | - Giuseppe Campiani
- Dipartimento Farmaco Chimico Tecnologico Universita' degli Studi di Siena, Siena, Italy
| | - Anna Ramunno
- Dipartimento di Scienze Farmaceutiche Universita' degli Studi di Salerno, Fisciano, Italy
| | - Caterina Fattorusso
- Dipartimento di Scienze Farmaceutiche Universita' degli Studi di Salerno, Fisciano, Italy
| | - Vito Nacci
- Dipartimento Farmaco Chimico Tecnologico Universita' degli Studi di Siena, Siena, Italy
| | - Mark Lawler
- Department of Haematology Sir Patrick Dun Research Labs. St. James's Hospital and Trinity College, Dublin, Ireland
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Mc Gee MM, Campiani G, Ramunno A, Fattorusso C, Nacci V, Lawler M, Williams DC, Zisterer DM. PYRROLO-1,5-BENZOXAZEPINES INDUCE APOPTOSIS IN CHRONIC MYELOID LEUKEMIA (CML) CELLS BY BYPASSING THE APOPTOTIC SUPPRESSOR BCR-ABL. ScientificWorldJournal 2001. [DOI: 10.1100/tsw.2001.23.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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