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Huang M, Fang W, Farrel A, Li L, Chronopoulos A, Nasholm N, Cheng B, Zheng T, Yoda H, Barata MJ, Porras T, Miller ML, Zhen Q, Ghiglieri L, McHenry L, Wang L, Asgharzadeh S, Park J, Gustafson WC, Matthay KK, Maris JM, Weiss WA. ALK upregulates POSTN and WNT signaling to drive neuroblastoma. Cell Rep 2024; 43:113927. [PMID: 38451815 DOI: 10.1016/j.celrep.2024.113927] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 12/29/2023] [Accepted: 02/21/2024] [Indexed: 03/09/2024] Open
Abstract
Neuroblastoma is the most common extracranial solid tumor of childhood. While MYCN and mutant anaplastic lymphoma kinase (ALKF1174L) cooperate in tumorigenesis, how ALK contributes to tumor formation remains unclear. Here, we used a human stem cell-based model of neuroblastoma. Mis-expression of ALKF1174L and MYCN resulted in shorter latency compared to MYCN alone. MYCN tumors resembled adrenergic, while ALK/MYCN tumors resembled mesenchymal, neuroblastoma. Transcriptomic analysis revealed enrichment in focal adhesion signaling, particularly the extracellular matrix genes POSTN and FN1 in ALK/MYCN tumors. Patients with ALK-mutant tumors similarly demonstrated elevated levels of POSTN and FN1. Knockdown of POSTN, but not FN1, delayed adhesion and suppressed proliferation of ALK/MYCN tumors. Furthermore, loss of POSTN reduced ALK-dependent activation of WNT signaling. Reciprocally, inhibition of the WNT pathway reduced expression of POSTN and growth of ALK/MYCN tumor cells. Thus, ALK drives neuroblastoma in part through a feedforward loop between POSTN and WNT signaling.
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Affiliation(s)
- Miller Huang
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA; Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
| | - Wanqi Fang
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA; Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Alvin Farrel
- Division of Oncology and Center for Childhood Cancer Research, Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Biomedical and Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Linwei Li
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA
| | - Antonios Chronopoulos
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA
| | - Nicole Nasholm
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Bo Cheng
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA
| | - Tina Zheng
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Hiroyuki Yoda
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Megumi J Barata
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Tania Porras
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA
| | - Matthew L Miller
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Qiqi Zhen
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Lisa Ghiglieri
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Lauren McHenry
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Linyu Wang
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Shahab Asgharzadeh
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA; Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - JinSeok Park
- Children's Hospital Los Angeles, Cancer and Blood Disease Institutes, and The Saban Research Institute, Los Angeles, CA, USA; Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - W Clay Gustafson
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA; Departments of Pediatrics and Neurological Surgery, University of California, San Francisco, San Francisco, CA, USA
| | - Katherine K Matthay
- Departments of Pediatrics and Neurological Surgery, University of California, San Francisco, San Francisco, CA, USA
| | - John M Maris
- Division of Oncology and Center for Childhood Cancer Research, Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - William A Weiss
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA; Departments of Pediatrics and Neurological Surgery, University of California, San Francisco, San Francisco, CA, USA.
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Sas LK, Chronopoulos A, Boujan T, Krastel H, Hattenbach LO. [Neurovascular conflict as a rare cause of internal and external ophthalmoplegia]. Ophthalmologie 2024:10.1007/s00347-024-02017-5. [PMID: 38456996 DOI: 10.1007/s00347-024-02017-5] [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] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 02/07/2024] [Accepted: 02/14/2024] [Indexed: 03/09/2024]
Affiliation(s)
- L K Sas
- Klinik für Augenheilkunde, Klinikum Ludwigshafen, Ludwigshafen am Rhein, Deutschland
| | - A Chronopoulos
- Klinik für Augenheilkunde, Klinikum Ludwigshafen, Ludwigshafen am Rhein, Deutschland.
| | - T Boujan
- Zentralinstitut für Diagnostische und Interventionelle Radiologie, Klinikum Ludwigshafen, Ludwigshafen am Rhein, Deutschland
| | - H Krastel
- Universitäts-Augenklinik, Medizinische Fakultät Mannheim, Ruprecht-Karls-Universität Heidelberg, Mannheim, Deutschland
| | - L-O Hattenbach
- Klinik für Augenheilkunde, Klinikum Ludwigshafen, Ludwigshafen am Rhein, Deutschland
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Lascano D, Zobel MJ, Lee WG, Chen SY, Zamora A, Asuelime GE, Choi SY, Chronopoulos A, Asgharzadeh S, Marachelian A, Park J, Sheard MA, Kim ES. Anti-CCL2 antibody combined with etoposide prolongs survival in a minimal residual disease mouse model of neuroblastoma. Sci Rep 2023; 13:19915. [PMID: 37964011 PMCID: PMC10645976 DOI: 10.1038/s41598-023-46968-2] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 11/07/2023] [Indexed: 11/16/2023] Open
Abstract
C-C motif chemokine ligand 2 (CCL2) is a monocyte chemoattractant that promotes metastatic disease and portends a poor prognosis in many cancers. To determine the potential of anti-CCL2 inhibition as a therapy for recurrent metastatic disease in neuroblastoma, a mouse model of minimal residual disease was utilized in which residual disease was treated with anti-CCL2 monoclonal antibody with etoposide. The effect of anti-CCL2 antibody on neuroblastoma cells was determined in vitro with cell proliferation, transwell migration, and 2-dimensional chemotaxis migration assays. The in vivo efficacy of anti-CCL2 antibody and etoposide against neuroblastoma was assessed following resection of primary tumors formed by two cell lines or a patient-derived xenograft (PDX) in immunodeficient NOD-scid gamma mice. In vitro, anti-CCL2 antibody did not affect cell proliferation but significantly inhibited neuroblastoma cell and monocyte migration towards an increasing CCL2 concentration gradient. Treatment of mice with anti-CCL2 antibody combined with etoposide significantly increased survival of mice after resection of primary tumors, compared to untreated mice.
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Affiliation(s)
- Danny Lascano
- Division of Pediatric Surgery, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - Michael J Zobel
- Division of Pediatric Surgery, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - William G Lee
- Division of Pediatric Surgery, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - Stephanie Y Chen
- Division of Pediatric Surgery, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - Abigail Zamora
- Division of Pediatric Surgery, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - Grace E Asuelime
- Division of Pediatric Surgery, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - So Yung Choi
- Biostatistics and Bioinformatics Research Center, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Antonios Chronopoulos
- Division of Hematology, Oncology and Blood and Marrow Transplantation, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Shahab Asgharzadeh
- Division of Hematology, Oncology and Blood and Marrow Transplantation, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Araz Marachelian
- Division of Hematology, Oncology and Blood and Marrow Transplantation, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Jinseok Park
- Division of Hematology, Oncology and Blood and Marrow Transplantation, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Michael A Sheard
- The Saban Research Institute, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - Eugene S Kim
- Division of Pediatric Surgery, Children's Hospital Los Angeles, Los Angeles, CA, USA.
- Division of Hematology, Oncology and Blood and Marrow Transplantation, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
- Department of Surgery, Cedars-Sinai Medical Center, 116 N. Robertson Blvd, Suite PACT 700, Los Angeles, CA, 90048, USA.
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Schiemenz C, Lüken S, Klassen AM, Ranjbar M, Illerhaus G, Fend F, Heindl LM, Chronopoulos A, Grisanti S, Kakkassery V. [Clinical procedures for intraocular lymphomas]. Ophthalmologie 2022; 119:675-685. [PMID: 35925411 DOI: 10.1007/s00347-022-01651-1] [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] [Subscribe] [Scholar Register] [Accepted: 04/21/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND The classification of intraocular lymphomas is based on their anatomical location. They are divided into uveal lymphomas with involvement of the choroid, ciliary body or iris and vitreoretinal lymphomas with isolated or combined involvement of the vitreous body and/or retina. Over the last decades it has become increasingly possible to work out the clinical and pathobiological features of the various subtypes, thereby reducing the diagnostic hurdles and creating improved treatment options. OBJECTIVE A summary of the various types of intraocular lymphoma in terms of clinical features, diagnostics, treatment and prognosis is given as well as recommendations for follow-up care. METHODS A selective literature search was carried out on the subject of intraocular lymphomas using PubMed and Google Scholar. RESULTS Intraocular lymphomas affect different structures, so that the symptoms can also be very different. The diagnostic spectrum ranges from typical ocular examination methods to sample biopsies with subsequent cytological, histological and molecular pathological processing. The treatment pillars available are percutaneous irradiation and intravitreal drug administration as local treatment and systemic treatment or a combination of systemic and local treatment. The prognosis depends mainly on the subtype of the lymphoma and the extent of the infestation when the diagnosis is confirmed. Even though some effective treatment options are now available, it has not yet been possible to significantly reduce the mortality rate. CONCLUSION Many different options are available for the diagnostics and treatment of intraocular lymphomas, which require close interdisciplinary cooperation. The further developments in the field of molecular pathology allow a faster and more accurate diagnosis and could open up new treatment options in the future.
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Affiliation(s)
- C Schiemenz
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland.
| | - S Lüken
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - A M Klassen
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - M Ranjbar
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - G Illerhaus
- Klinik für Hämatologie, Onkologie, Stammzelltransplantation und Palliativmedizin, Klinikum der Landeshauptstadt Stuttgart gKAöR | Standort Mitte, Katharinenhospital, Stuttgart, Deutschland
- Stuttgart Cancer Center, Tumorzentrum Eva Mayr-Stihl, Stuttgart, Deutschland
| | - F Fend
- Institut für Pathologie und Neuropathologie, Universitätsklinikum Tübingen, Tübingen, Deutschland
- Comprehensive Cancer Center, Tübingen-Stuttgart, Deutschland
| | - L M Heindl
- Zentrum für Augenheilkunde, Medizinische Fakultät und Universitätsklinikum Köln, Universität zu Köln, Köln, Deutschland
- Centrum für Integrierte Onkologie (CIO) Aachen-Bonn-Köln-Düsseldorf, Köln, Deutschland
| | - A Chronopoulos
- Augenklinik, Klinikum Ludwigshafen, Ludwigshafen, Deutschland
| | - S Grisanti
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - V Kakkassery
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
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5
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McAndrews KM, Xiao F, Chronopoulos A, LeBleu VS, Kugeratski FG, Kalluri R. Exosome-mediated delivery of CRISPR/Cas9 for targeting of oncogenic Kras G12D in pancreatic cancer. Life Sci Alliance 2021; 4:4/9/e202000875. [PMID: 34282051 PMCID: PMC8321670 DOI: 10.26508/lsa.202000875] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 07/02/2021] [Accepted: 07/05/2021] [Indexed: 12/11/2022] Open
Abstract
This work identifies the use of exosomes to specifically deliver CRISPR/Cas9 to target oncogenic KrasG12D mutation in pancreatic cancer as a nonviral therapeutic strategy. CRISPR/Cas9 is a promising technology for gene editing. To date, intracellular delivery vehicles for CRISPR/Cas9 are limited by issues of immunogenicity, restricted packaging capacity, and low tolerance. Here, we report an alternative, nonviral delivery system for CRISPR/Cas9 based on engineered exosomes. We show that non-autologous exosomes can encapsulate CRISPR/Cas9 plasmid DNA via commonly available transfection reagents and can be delivered to recipient cancer cells to induce targeted gene deletion. As a proof-of-principle, we demonstrate that exosomes loaded with CRISPR/Cas9 can target the mutant KrasG12D oncogenic allele in pancreatic cancer cells to suppress proliferation and inhibit tumor growth in syngeneic subcutaneous and orthotopic models of pancreatic cancer. Exosomes may thus be a promising delivery platform for CRISPR/Cas9 gene editing for targeted therapies.
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Affiliation(s)
- Kathleen M McAndrews
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Fei Xiao
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Antonios Chronopoulos
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Valerie S LeBleu
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Fernanda G Kugeratski
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Raghu Kalluri
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA .,Department of Bioengineering, Rice University, Houston, TX, USA.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
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Hattenbach LO, Grisanti S, Priglinger SG, Chronopoulos A. [Proliferative vitreoretinopathy (PVR) minimal: same, same but different. Characteristics and surgical treatment of PVR-associated macular pucker]. Ophthalmologe 2021; 118:24-29. [PMID: 33336260 DOI: 10.1007/s00347-020-01292-2] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
BACKGROUND Epiretinal membrane formation resulting in a macular pucker is among the typical complications associated with proliferative vitreoretinopathy (PVR) in retinal detachment and has a major impact on the functional outcome after surgical treatment. METHODS A literature search was carried out in PubMed. RESULTS Approaches to the surgical treatment of PVR-associated macular pucker include complete membrane removal within the vascular arcades aimed at relieving retinal traction at the posterior pole and peeling of the internal limiting membrane (ILM). As a further option it has been suggested that primary ILM peeling in rhegmatogenous retinal detachment repair may reduce or even prevent postoperative epiretinal membrane formation. In addition, correct timing of surgery is a factor that may contribute to successful treatment. DISCUSSION Due to the particularly strong adhesion and the frequent occurrence of concurrent retinal detachment, the surgical approach to PVR-associated macular pucker is particularly challenging. As with idiopathic epiretinal membranes, surgical removal has the potential to improve functional outcomes; however, visual improvement depends largely on whether the macula was involved in the original retinal detachment.
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Affiliation(s)
- L-O Hattenbach
- Augenklinik des Klinikums Ludwigshafen, Bremserstr. 79, 67063, Ludwigshafen, Deutschland.
| | - S Grisanti
- Augenklinik, der Universitätsmedizin Lübeck, Lübeck, Deutschland
| | - S G Priglinger
- Universitäts-Augenklinik München, LMU, München, Deutschland
| | - A Chronopoulos
- Augenklinik des Klinikums Ludwigshafen, Bremserstr. 79, 67063, Ludwigshafen, Deutschland
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Abstract
Shedding of microbial extracellular vesicles constitutes a universal mechanism for inter-kingdom and intra-kingdom communication that is conserved among prokaryotic and eukaryotic microbes. In this review we delineate fundamental aspects of bacterial extracellular vesicles (BEVs) including their biogenesis, cargo composition, and interactions with host cells. We critically examine the evidence that BEVs from the host gut microbiome can enter the circulatory system to disseminate to distant organs and tissues. The potential involvement of BEVs in carcinogenesis is evaluated and future research ideas explored. We further discuss the potential of BEVs in microbiome-based liquid biopsies for cancer diagnostics and bioengineering strategies for cancer therapy.
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Affiliation(s)
- Antonios Chronopoulos
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Raghu Kalluri
- Department of Cancer Biology, Metastasis Research Center, University of Texas MD Anderson Cancer Center, Houston, TX, USA. .,Department of Bioengineering, Rice University, Houston, TX, USA. .,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA.
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Chronopoulos A, Thorpe SD, Cortes E, Lachowski D, Rice AJ, Mykuliak VV, Róg T, Lee DA, Hytönen VP, Del Río Hernández AE. Syndecan-4 tunes cell mechanics by activating the kindlin-integrin-RhoA pathway. Nat Mater 2020; 19:669-678. [PMID: 31907416 PMCID: PMC7260055 DOI: 10.1038/s41563-019-0567-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 11/19/2019] [Indexed: 05/24/2023]
Abstract
Extensive research over the past decades has identified integrins to be the primary transmembrane receptors that enable cells to respond to external mechanical cues. We reveal here a mechanism whereby syndecan-4 tunes cell mechanics in response to localized tension via a coordinated mechanochemical signalling response that involves activation of two other receptors: epidermal growth factor receptor and β1 integrin. Tension on syndecan-4 induces cell-wide activation of the kindlin-2/β1 integrin/RhoA axis in a PI3K-dependent manner. Furthermore, syndecan-4-mediated tension at the cell-extracellular matrix interface is required for yes-associated protein activation. Extracellular tension on syndecan-4 triggers a conformational change in the cytoplasmic domain, the variable region of which is indispensable for the mechanical adaptation to force, facilitating the assembly of a syndecan-4/α-actinin/F-actin molecular scaffold at the bead adhesion. This mechanotransduction pathway for syndecan-4 should have immediate implications for the broader field of mechanobiology.
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Affiliation(s)
- Antonios Chronopoulos
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Stephen D Thorpe
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London, UK.
| | - Ernesto Cortes
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Dariusz Lachowski
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Alistair J Rice
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Vasyl V Mykuliak
- Faculty of Medicine and Health Technology and BioMediTech, Tampere University, Tampere, Finland
- Fimlab Laboratories, Tampere, Finland
| | - Tomasz Róg
- Department of Physics, University of Helsinki, Helsinki, Finland
| | - David A Lee
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London, UK
| | - Vesa P Hytönen
- Faculty of Medicine and Health Technology and BioMediTech, Tampere University, Tampere, Finland.
- Fimlab Laboratories, Tampere, Finland.
| | - Armando E Del Río Hernández
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK.
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Perone Y, Farrugia AJ, Rodríguez-Meira A, Győrffy B, Ion C, Uggetti A, Chronopoulos A, Marrazzo P, Faronato M, Shousha S, Davies C, Steel JH, Patel N, Del Rio Hernandez A, Coombes C, Pruneri G, Lim A, Calvo F, Magnani L. Author Correction: SREBP1 drives keratin-80-dependent cytoskeletal changes and invasive behavior in endocrine-resistant ERα breast cancer. Nat Commun 2019; 10:3791. [PMID: 31427580 PMCID: PMC6700086 DOI: 10.1038/s41467-019-11801-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Ylenia Perone
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Aaron J Farrugia
- Division of Cancer Biology, Tumour Microenvironment Team, Institute of Cancer Research, London, UK
| | - Alba Rodríguez-Meira
- Department of Surgery and Cancer, Imperial College London, London, UK.,MRC Molecular Haematology Unit, Haematopoietic Stem Cell Biology Laboratory, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Balázs Győrffy
- MTA TTK Lendület Cancer Biomarker Research Group, Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary.,2nd Department of Pediatrics, Semmelweis University, Budapest, Hungary
| | - Charlotte Ion
- Department of Surgery and Cancer, Imperial College London, London, UK
| | | | - Antonios Chronopoulos
- Faculty of Engineering, Department of Bioengineering, Imperial College London, London, UK
| | - Pasquale Marrazzo
- Department for Life Quality Studies, Alma Mater Studiorum, University of Bologna, Rimini, Italy
| | - Monica Faronato
- Department of Chemistry, Imperial College London, London, UK
| | - Sami Shousha
- Histopathology Department, Imperial College London, Charing Cross Hospital NHS Trust, London, UK
| | - Claire Davies
- ECMC Imperial College. Department of Surgery and Cancer, Imperial College London, London, UK
| | - Jennifer H Steel
- ECMC Imperial College. Department of Surgery and Cancer, Imperial College London, London, UK
| | - Naina Patel
- ECMC Imperial College. Department of Surgery and Cancer, Imperial College London, London, UK
| | | | - Charles Coombes
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Giancarlo Pruneri
- Pathology Department, Fondazione IRCCS Istituto Nazionale Tumori and University of Milan, School of Medicine, Milan, Italy
| | - Adrian Lim
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Fernando Calvo
- Division of Cancer Biology, Tumour Microenvironment Team, Institute of Cancer Research, London, UK. .,Instituto de Biomedicina y Biotecnologia de Cantabria, Santander, Spain.
| | - Luca Magnani
- Department of Surgery and Cancer, Imperial College London, London, UK.
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10
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Chronopoulos A, Schwarz P, Fornoff L, Hattenbach LO. [Vitrectomy for endophthalmitis : Incubation time and prognosis following intravitreal injection vs. cataract surgery]. Ophthalmologe 2019; 116:746-752. [PMID: 30421147 DOI: 10.1007/s00347-018-0816-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Bacterial endophthalmitis is a rare but devastating complication following intraocular surgery. Guidelines on the diagnostics and treatment are based mainly on experience of endophthalmitis treatment following cataract surgery. OBJECTIVE In this study we analyzed infectious endophthalmitis cases following either intravitreal operative drug injection (IVOM) or cataract surgery for possible differences in the clinical course and prognosis. MATERIAL AND METHODS All cases of endophthalmitis from January 2013 through December 2017 retrieved from our electronic database were examined and analyzed according to the type of intervention, time elapsed until diagnosis, pathogen detection, postinterventional visual acuity and the presence of comorbidities. RESULTS A total of 29 cases were included, 11 secondary to IVOM and 18 secondary to cataract surgery. Symptoms for all cases presented at a mean of 6.8 days, with a significant difference between patients following IVOM (5.5 days) and patients following cataract surgery (4.1 days, p < 0.05). Patients with endophthalmitis following cataract surgery had a significantly better visual outcome 1 year after treatment compared to patients with endophthalmitis following IVOM (p < 0.05). The most commonly isolated pathogen was Staphylococcus epidermidis. CONCLUSION Knowledge of the typical clinical course in the development of endophthalmitis following IVOM or cataract surgery is a critical prerequisite for the timely diagnosis and initiation of adequate treatment measures. Our results point towards a significantly delayed clinical manifestation of endophthalmitis following IVOM, possibly also caused by the anatomical origin of the infection. In an era of increasing numbers of IVOM this clinical observation could be helpful for a careful follow-up control beyond the previous traditional timepoints.
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Affiliation(s)
- A Chronopoulos
- Klinik für Augenheilkunde, Akademisches Lehrkrankenhaus der Johannes Gutenberg-Universität Mainz und der Medizinischen Fakultät Mannheim der Universität Heidelberg, Klinikum Ludwigshafen am Rhein, Bremserstr. 79, 67063, Ludwigshafen am Rhein, Deutschland.
| | - P Schwarz
- Klinik für Augenheilkunde, Akademisches Lehrkrankenhaus der Johannes Gutenberg-Universität Mainz und der Medizinischen Fakultät Mannheim der Universität Heidelberg, Klinikum Ludwigshafen am Rhein, Bremserstr. 79, 67063, Ludwigshafen am Rhein, Deutschland
| | - L Fornoff
- Klinik für Augenheilkunde, Akademisches Lehrkrankenhaus der Johannes Gutenberg-Universität Mainz und der Medizinischen Fakultät Mannheim der Universität Heidelberg, Klinikum Ludwigshafen am Rhein, Bremserstr. 79, 67063, Ludwigshafen am Rhein, Deutschland
| | - L-O Hattenbach
- Klinik für Augenheilkunde, Akademisches Lehrkrankenhaus der Johannes Gutenberg-Universität Mainz und der Medizinischen Fakultät Mannheim der Universität Heidelberg, Klinikum Ludwigshafen am Rhein, Bremserstr. 79, 67063, Ludwigshafen am Rhein, Deutschland
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11
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Perone Y, Farrugia AJ, Rodríguez-Meira A, Győrffy B, Ion C, Uggetti A, Chronopoulos A, Marrazzo P, Faronato M, Shousha S, Davies C, Steel JH, Patel N, Del Rio Hernandez A, Coombes C, Pruneri G, Lim A, Calvo F, Magnani L. SREBP1 drives Keratin-80-dependent cytoskeletal changes and invasive behavior in endocrine-resistant ERα breast cancer. Nat Commun 2019; 10:2115. [PMID: 31073170 PMCID: PMC6509342 DOI: 10.1038/s41467-019-09676-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 03/22/2019] [Indexed: 01/03/2023] Open
Abstract
Approximately 30% of ERα breast cancer patients relapse with metastatic disease following adjuvant endocrine therapies. The connection between acquisition of drug resistance and invasive potential is poorly understood. In this study, we demonstrate that the type II keratin topological associating domain undergoes epigenetic reprogramming in aromatase inhibitors (AI)-resistant cells, leading to Keratin-80 (KRT80) upregulation. KRT80 expression is driven by de novo enhancer activation by sterol regulatory element-binding protein 1 (SREBP1). KRT80 upregulation directly promotes cytoskeletal rearrangements at the leading edge, increased focal adhesion and cellular stiffening, collectively promoting cancer cell invasion. Shearwave elasticity imaging performed on prospectively recruited patients confirms KRT80 levels correlate with stiffer tumors. Immunohistochemistry showed increased KRT80-positive cells at relapse and, using several clinical endpoints, KRT80 expression associates with poor survival. Collectively, our data uncover an unpredicted and potentially targetable direct link between epigenetic and cytoskeletal reprogramming promoting cell invasion in response to chronic AI treatment.
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MESH Headings
- Antineoplastic Agents, Hormonal/pharmacology
- Antineoplastic Agents, Hormonal/therapeutic use
- Aromatase Inhibitors/pharmacology
- Aromatase Inhibitors/therapeutic use
- Breast/pathology
- Breast Neoplasms/drug therapy
- Breast Neoplasms/genetics
- Breast Neoplasms/mortality
- Breast Neoplasms/pathology
- Cell Movement/drug effects
- Cell Movement/genetics
- Cytoskeleton/genetics
- Cytoskeleton/pathology
- Drug Resistance, Neoplasm/genetics
- Enhancer Elements, Genetic/genetics
- Epigenesis, Genetic
- Estrogen Receptor alpha/metabolism
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Keratins, Type II/genetics
- Keratins, Type II/metabolism
- MCF-7 Cells
- Neoplasm Invasiveness/genetics
- Neoplasm Invasiveness/pathology
- Neoplasm Recurrence, Local/drug therapy
- Neoplasm Recurrence, Local/genetics
- Neoplasm Recurrence, Local/mortality
- Neoplasm Recurrence, Local/pathology
- Prognosis
- Protein Domains/genetics
- Sterol Regulatory Element Binding Protein 1/metabolism
- Up-Regulation
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Affiliation(s)
- Ylenia Perone
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Aaron J Farrugia
- Division of Cancer Biology, Tumour Microenvironment Team, Institute of Cancer Research, London, UK
| | - Alba Rodríguez-Meira
- Department of Surgery and Cancer, Imperial College London, London, UK
- MRC Molecular Haematology Unit, Haematopoietic Stem Cell Biology Laboratory, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Balázs Győrffy
- MTA TTK Lendület Cancer Biomarker Research Group, Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary
- 2nd Department of Pediatrics, Semmelweis University, Budapest, Hungary
| | - Charlotte Ion
- Department of Surgery and Cancer, Imperial College London, London, UK
| | | | - Antonios Chronopoulos
- Faculty of Engineering, Department of Bioengineering, Imperial College London, London, UK
| | - Pasquale Marrazzo
- Department for Life Quality Studies, Alma Mater Studiorum, University of Bologna, Rimini, Italy
| | - Monica Faronato
- Department of Chemistry, Imperial College London, London, UK
| | - Sami Shousha
- Histopathology Department, Imperial College London, Charing Cross Hospital NHS Trust, London, UK
| | - Claire Davies
- ECMC Imperial College. Department of Surgery and Cancer, Imperial College London, London, UK
| | - Jennifer H Steel
- ECMC Imperial College. Department of Surgery and Cancer, Imperial College London, London, UK
| | - Naina Patel
- ECMC Imperial College. Department of Surgery and Cancer, Imperial College London, London, UK
| | | | - Charles Coombes
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Giancarlo Pruneri
- Pathology Department, Fondazione IRCCS Istituto Nazionale Tumori and University of Milan, School of Medicine, Milan, Italy
| | - Adrian Lim
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Fernando Calvo
- Division of Cancer Biology, Tumour Microenvironment Team, Institute of Cancer Research, London, UK.
- Instituto de Biomedicina y Biotecnologia de Cantabria, Santander, Spain.
| | - Luca Magnani
- Department of Surgery and Cancer, Imperial College London, London, UK.
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Cortes E, Lachowski D, Rice A, Chronopoulos A, Robinson B, Thorpe S, Lee DA, Possamai LA, Wang H, Pinato DJ, Del Río Hernández AE. Retinoic Acid Receptor-β Is Downregulated in Hepatocellular Carcinoma and Cirrhosis and Its Expression Inhibits Myosin-Driven Activation and Durotaxis in Hepatic Stellate Cells. Hepatology 2019; 69:785-802. [PMID: 30055117 DOI: 10.1002/hep.30193] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 07/25/2018] [Indexed: 01/17/2023]
Abstract
Hepatic stellate cells (HSCs) are essential perisinusoidal cells in both healthy and diseased liver. HSCs modulate extracellular matrix (ECM) homeostasis when quiescent, but in liver fibrosis, HSCs become activated and promote excess deposition of ECM molecules and tissue stiffening via force generation and mechanosensing. In hepatocellular carcinoma (HCC), activated HSCs infiltrate the stroma and migrate to the tumor core to facilitate paracrine signaling with cancer cells. Because the function of HSCs is known to be modulated by retinoids, we investigated the expression profile of retinoic acid receptor beta (RAR-β) in patients with cirrhosis and HCC, as well as the effects of RAR-β activation in HSCs. We found that RAR-β expression is significantly reduced in cirrhotic and HCC tissues. Using a comprehensive set of biophysical methods combined with cellular and molecular biology, we have elucidated the biomechanical mechanism by which all trans-retinoic acid promotes HSC deactivation via RAR-β-dependent transcriptional downregulation of myosin light chain 2 expression. Furthermore, this also abrogated mechanically driven migration toward stiffer substrates. Conclusion: Targeting mechanotransduction in HSCs at the transcriptional level may offer therapeutic options for a range of liver diseases.
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Affiliation(s)
- Ernesto Cortes
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Dariusz Lachowski
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Alistair Rice
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Antonios Chronopoulos
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Benjamin Robinson
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Stephen Thorpe
- School of Engineering and Materials Science, Queen Mary University of London, London, United Kingdom
| | - David A Lee
- School of Engineering and Materials Science, Queen Mary University of London, London, United Kingdom
| | - Lucia A Possamai
- Division of Integrative Systems Medicine and Digestive Disease, Imperial College London, London, United Kingdom
| | - Haiyun Wang
- School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - David J Pinato
- Department of Surgery and Cancer, Hammersmith Hospital Campus, Imperial College London, London, United Kingdom
| | - Armando E Del Río Hernández
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, United Kingdom
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Cortes E, Sarper M, Robinson B, Lachowski D, Chronopoulos A, Thorpe SD, Lee DA, Del Río Hernández AE. GPER is a mechanoregulator of pancreatic stellate cells and the tumor microenvironment. EMBO Rep 2019; 20:e46556. [PMID: 30538117 PMCID: PMC6322386 DOI: 10.15252/embr.201846556] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 10/12/2018] [Accepted: 10/23/2018] [Indexed: 01/08/2023] Open
Abstract
The mechanical properties of the tumor microenvironment are emerging as attractive targets for the development of therapies. Tamoxifen, an agonist of the G protein-coupled estrogen receptor (GPER), is widely used to treat estrogen-positive breast cancer. Here, we show that tamoxifen mechanically reprograms the tumor microenvironment through a newly identified GPER-mediated mechanism. Tamoxifen inhibits the myofibroblastic differentiation of pancreatic stellate cells (PSCs) in the tumor microenvironment of pancreatic cancer in an acto-myosin-dependent manner via RhoA-mediated contractility, YAP deactivation, and GPER signaling. This hampers the ability of PSCs to remodel the extracellular matrix and to promote cancer cell invasion. Tamoxifen also reduces the recruitment and polarization to the M2 phenotype of tumor-associated macrophages. Our results highlight GPER as a mechanical regulator of the tumor microenvironment that targets the three hallmarks of pancreatic cancer: desmoplasia, inflammation, and immune suppression. The well-established safety of tamoxifen in clinics may offer the possibility to redirect the singular focus of tamoxifen on the cancer cells to the greater tumor microenvironment and lead a new strategy of drug repurposing.
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Affiliation(s)
- Ernesto Cortes
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Muge Sarper
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Benjamin Robinson
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Dariusz Lachowski
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Antonios Chronopoulos
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
| | - Stephen D Thorpe
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London, UK
| | - David A Lee
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London, UK
| | - Armando E Del Río Hernández
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, UK
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Samandari M, Julia MG, Rice A, Chronopoulos A, Del Rio Hernandez AE. Liquid biopsies for management of pancreatic cancer. Transl Res 2018; 201:98-127. [PMID: 30118658 DOI: 10.1016/j.trsl.2018.07.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/17/2018] [Accepted: 07/17/2018] [Indexed: 02/07/2023]
Abstract
Pancreatic cancer is one of the main causes of cancer-related deaths worldwide. It is asymptomatic at an early stage, and most diagnosis occurs when the disease is already at a late stage, by which time the tumor is nonresectable. In order to increase the overall survival of patients with pancreatic cancer, as well as to decrease the cancer burden, it is necessary to perform early diagnosis, prognosis stratifications and cancer monitoring using accurate, minimally invasive, and cost-effective methods. Liquid biopsies seek to detect tumor-associated biomarkers in a variety of extractable body fluids and can help to monitor treatment response and disease progression, and even predict patient outcome. In patients with pancreatic cancer, tumor-derived materials, primarily circulating tumor DNA, circulating tumor cells and exosomes, are being studied for inclusion in the management of the disease. This review focuses on describing the biology of these biomarkers, methods for their enrichment and detection, as well as their potential for clinical application. Moreover, we discuss the future direction of liquid biopsies and introduce how they can be exploited toward point of care personalized medicine for the management of pancreatic cancer.
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Affiliation(s)
- Mohamadmahdi Samandari
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - María Gil Julia
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Alistair Rice
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Antonios Chronopoulos
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Armando E Del Rio Hernandez
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom.
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15
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Jacquier P, Massa H, Chronopoulos A, Thumann G, Souteyrand G. Hémorragie intra-vitréenne, persistance de la vascularisation fœtale et Incontinentia Pigmenti. J Fr Ophtalmol 2017; 40:e397-e399. [DOI: 10.1016/j.jfo.2016.07.031] [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] [Received: 02/25/2016] [Revised: 07/07/2016] [Accepted: 07/24/2016] [Indexed: 11/15/2022]
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Chronopoulos A, Hoogewoud F, Steffen H, Thumann G. Parainfektiöse Optikusneuritis mit makulärem Infiltrat bei Neisseria-meningitidis-B-Meningitis. Ophthalmologe 2017; 114:945-949. [DOI: 10.1007/s00347-016-0404-8] [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: 10/20/2022]
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17
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Lachowski D, Cortes E, Pink D, Chronopoulos A, Karim SA, P Morton J, Del Río Hernández AE. Substrate Rigidity Controls Activation and Durotaxis in Pancreatic Stellate Cells. Sci Rep 2017; 7:2506. [PMID: 28566691 PMCID: PMC5451433 DOI: 10.1038/s41598-017-02689-x] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/18/2017] [Indexed: 02/06/2023] Open
Abstract
Pancreatic Ductal Adenocarcinoma (PDAC) is an aggressive malignancy characterised by the presence of extensive desmoplasia, thought to be responsible for the poor response of patients to systemic therapies. Pancreatic stellate cells (PSCs) are key mediators in the production of this fibrotic stroma, upon activation transitioning to a myofibroblast-like, high matrix secreting phenotype. Given their importance in disease progression, characterisation of PSC activation has been extensive, however one aspect that has been overlooked is the mechano-sensing properties of the cell. Here, through the use of a physiomimetic system that recapitulates the mechanical microenvironment found within healthy and fibrotic pancreas, we demonstrate that matrix stiffness regulates activation and mechanotaxis in PSCs. We show the ability of PSCs to undergo phenotypic transition solely as a result of changes in extracellular matrix stiffness, whilst observing the ability of PSCs to durotactically respond to stiffness variations within their local environment. Our findings implicate the mechanical microenvironment as a potent contributor to PDAC progression and survival via induction of PSC activation and fibrosis, suggesting that direct mechanical reprogramming of PSCs may be a viable alternative in the treatment of this lethal disease.
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Affiliation(s)
- Dariusz Lachowski
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Ernesto Cortes
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Daniel Pink
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Antonios Chronopoulos
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Saadia A Karim
- Pancreatic Cancer Research Team, CRUK Beatson Institute, Glasgow, G61 1BD, United Kingdom
| | - Jennifer P Morton
- Pancreatic Cancer Research Team, CRUK Beatson Institute, Glasgow, G61 1BD, United Kingdom
| | - Armando E Del Río Hernández
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom.
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18
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Tobalem S, Thumann G, Chronopoulos A. Volumineux embole de l’artère centrale rétinienne non compliqué. J Fr Ophtalmol 2017; 40:345. [DOI: 10.1016/j.jfo.2016.11.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 11/26/2016] [Accepted: 11/30/2016] [Indexed: 11/30/2022]
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Roquelaure D, Harbarth S, Schutz JS, Thumann G, Chronopoulos A. Epstein-Barr-Virus-assoziierte akute retinale Nekrose. Ophthalmologe 2016; 113:864-866. [DOI: 10.1007/s00347-016-0229-5] [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: 11/28/2022]
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Chronopoulos A, Robinson B, Sarper M, Cortes E, Auernheimer V, Lachowski D, Attwood S, García R, Ghassemi S, Fabry B, Del Río Hernández A. ATRA mechanically reprograms pancreatic stellate cells to suppress matrix remodelling and inhibit cancer cell invasion. Nat Commun 2016; 7:12630. [PMID: 27600527 PMCID: PMC5023948 DOI: 10.1038/ncomms12630] [Citation(s) in RCA: 182] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 07/18/2016] [Indexed: 12/13/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a highly aggressive malignancy with a dismal survival rate. Persistent activation of pancreatic stellate cells (PSCs) can perturb the biomechanical homoeostasis of the tumour microenvironment to favour cancer cell invasion. Here we report that ATRA, an active metabolite of vitamin A, restores mechanical quiescence in PSCs via a mechanism involving a retinoic acid receptor beta (RAR-β)-dependent downregulation of actomyosin (MLC-2) contractility. We show that ATRA reduces the ability of PSCs to generate high traction forces and adapt to extracellular mechanical cues (mechanosensing), as well as suppresses force-mediated extracellular matrix remodelling to inhibit local cancer cell invasion in 3D organotypic models. Our findings implicate a RAR-β/MLC-2 pathway in peritumoural stromal remodelling and mechanosensory-driven activation of PSCs, and further suggest that mechanical reprogramming of PSCs with retinoic acid derivatives might be a viable alternative to stromal ablation strategies for the treatment of PDAC. Persistent activation of pancreatic stellate cells (PSCs) can perturb the biomechanical homeostasis of the tumour microenvironment. Here the authors show that all-trans retinoic acid reduces retinoic acid receptor beta dependent-actomyosin contractility and restores mechanical quiescence in PSCs.
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Affiliation(s)
- Antonios Chronopoulos
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Benjamin Robinson
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Muge Sarper
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Ernesto Cortes
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Vera Auernheimer
- Department of Physics, Biophysics Group, University of Erlangen-Nuremberg, Erlangen 91054, Germany
| | - Dariusz Lachowski
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Simon Attwood
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Rebeca García
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Saba Ghassemi
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA
| | - Ben Fabry
- Department of Physics, Biophysics Group, University of Erlangen-Nuremberg, Erlangen 91054, Germany
| | - Armando Del Río Hernández
- Cellular and Molecular Biomechanics Laboratory, Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
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Chronopoulos A, Varga Z, Steinfeld PA, Dahlmann R, Jukic T, Walter P, Thumann G. [Unusual IOL Calcification following Vitreoretinal Surgery with Silicone Oil Endotamponade]. Klin Monbl Augenheilkd 2014; 232:779-84. [PMID: 25393435 DOI: 10.1055/s-0034-1383230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
PURPOSE Calcification of intraocular lenses (IOL), although nowadays less frequent than in the past, is a well-documented complication that can still necessitate their explantation. Although mostly noted in hydrophilic materials it has been rarely reported in hydrophobic intraocular lenses. We wish to report on two unusual cases of intraocular lense (one hydrophobic and one hydrophilic with hydrophobic surface) calcification following vitrectomy and silicon oil endotamponade. METHODS In the course of treatment both patients underwent multiple ocular interventions due to re-detachment/persistent macular hole including local rt-PA or triamcinolone injection due to persistent postoperative anterior chamber inflammation/macular oedema. Finally and after thorough patient examination with characteristic visual complaints and difficulty in the retinal assessment the extraction of the calcified lenses was considered necessary. The configuration as well as the elemental analysis of the opacified surface of the IOLs was performed by means of high magnification microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy (EDX). Intraocular and systemic histories of both patients were summarised. RESULTS The scanning electron microscopy and EDX analysis demonstrated massive calcium-based deposits on the surface of the hydrophilic and a diffuse vacuolation and calcification consisting of oxygen (O), silicon (Si), magnesium (Mg), aluminium (Al), sulphur (S) and phosphorus (P) on the surface of the hydrophobic IOL. CONCLUSION The explantation of an IOL due to calcification represents an unusual event. The careful consideration of systemic and ocular factors that promote calcification processes can help reduce the incidence of calcification. Despite all efforts in material production and risk factor analysis, it is not always possible to define or even predict the exact cause of this phenomenon and in the presence of corresponding clinical symptoms IOL exchange remains as the sole option.
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Affiliation(s)
- A Chronopoulos
- Klinik für Augenheilkunde, Universitätsklinik Genf, Genf, Schweiz
| | - Z Varga
- Klinik für Augenheilkunde, Universitätsklinik Genf, Genf, Schweiz
| | - P A Steinfeld
- Klinik für Augenheilkunde, Universitätsklinik RWTH Aachen
| | - R Dahlmann
- Institut für Kunststoffverarbeitung in Industrie und Handwerk an der RWTH Aachen, RWTH Aachen
| | - T Jukic
- Department of Ophthalmology, University Hospital of Zagreb, Zagreb, Croatia
| | - P Walter
- Klinik für Augenheilkunde, Universitätsklinik RWTH Aachen
| | - G Thumann
- Klinik für Augenheilkunde, Universitätsklinik Genf, Genf, Schweiz
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Thieme C, Jonescu-Cuypers C, Chronopoulos A. Revision an gleicher Stelle – Ergebnisse bei Patienten mit Zustand nach Trabekulektomie mit Mitomycin C. Klin Monbl Augenheilkd 2013. [DOI: 10.1055/s-0033-1363372] [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: 10/25/2022]
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Chronopoulos A, Kilic E, Joussen AM, Lipski A. Biopsien bei unklaren Iristumoren: Erfahrungen mit der Essener Biopsiepinzette. Klin Monbl Augenheilkd 2013. [DOI: 10.1055/s-0033-1363383] [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: 10/25/2022]
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Chronopoulos A, Pleyer U, Mockenhaupt M. Okuläre Beteiligung bei Stevens-Johnson-Syndrom und Toxisch epidermaler Nekrolyse. Klin Monbl Augenheilkd 2012; 229:534-9. [DOI: 10.1055/s-0031-1299530] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- A. Chronopoulos
- Klinik für Augenheilkunde, Universitätsmedizin, Charité Berlin
| | - U. Pleyer
- Universitäts-Augenklinik, Charité Campus Virchow-Klinik
| | - M. Mockenhaupt
- Dokumentationszentrum schwerer Hautreaktionen (dZh), Universitäts-Hautklinik Freiburg
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Chronopoulos A. Der Effekt erhöhter Glukosekonzentration auf die Expression der Lysyl-Oxidase in retinalen Endothelzellen. Klin Monbl Augenheilkd 2010. [DOI: 10.1055/s-0030-1270046] [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: 10/18/2022]
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Roy S, Trudeau K, Roy S, Behl Y, Dhar S, Chronopoulos A. New Insights into Hyperglycemia-induced Molecular Changes in Microvascular Cells. J Dent Res 2009; 89:116-27. [DOI: 10.1177/0022034509355765] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Hyperglycemia is the most prevalent characteristic of diabetes and plays a central role in mediating adverse effects on vascular cells during the progression of diabetic vascular complications. In diabetic microangiopathy, hyperglycemia induces biochemical and molecular changes in microvascular cells that ultimately progress to retinal, renal, and neural complications and extends to other complications, including advanced periodontal disease. In this review, we describe changes involving basement membrane thickening, tissue remodeling, gap junctions, inflammation, cytokines, and transcription factors, and their effects on the pathogenesis of diabetic microvascular complications. The majority of the changes described relate to retinal microangiopathy, since ultrastructural, structural, and biochemical alterations have been well-characterized in this tissue.
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Affiliation(s)
- S. Roy
- Departments of Medicine and Ophthalmology, Boston University School of Medicine, and
- Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston University, 650 Albany Street, Boston, MA 02118, USA
| | - K. Trudeau
- Departments of Medicine and Ophthalmology, Boston University School of Medicine, and
- Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston University, 650 Albany Street, Boston, MA 02118, USA
| | - S. Roy
- Departments of Medicine and Ophthalmology, Boston University School of Medicine, and
- Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston University, 650 Albany Street, Boston, MA 02118, USA
| | - Y. Behl
- Departments of Medicine and Ophthalmology, Boston University School of Medicine, and
- Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston University, 650 Albany Street, Boston, MA 02118, USA
| | - S. Dhar
- Departments of Medicine and Ophthalmology, Boston University School of Medicine, and
- Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston University, 650 Albany Street, Boston, MA 02118, USA
| | - A. Chronopoulos
- Departments of Medicine and Ophthalmology, Boston University School of Medicine, and
- Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston University, 650 Albany Street, Boston, MA 02118, USA
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Chronopoulos A, Velhagen KH, Pleyer U. Epidemische Keratokonjunktivitis: Fortschritte in Diagnostik und Therapie. Klin Monbl Augenheilkd 2007. [DOI: 10.1055/s-2007-1004458] [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: 10/21/2022]
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30
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Pittaway JK, Ahuja KDK, Cehun M, Chronopoulos A, Robertson IK, Nestel PJ, Ball MJ. Dietary supplementation with chickpeas for at least 5 weeks results in small but significant reductions in serum total and low-density lipoprotein cholesterols in adult women and men. Ann Nutr Metab 2006; 50:512-8. [PMID: 17191025 DOI: 10.1159/000098143] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2005] [Accepted: 06/06/2006] [Indexed: 11/19/2022]
Abstract
AIM To compare the effects of a chickpea-supplemented diet and those of a wheat-supplemented diet on human serum lipids and lipoproteins. METHODS Forty-seven free-living adults participated in a randomized crossover weight maintenance dietary intervention involving two dietary periods, chickpea-supplemented and wheat-supplemented diets, each of at least 5 weeks duration. RESULTS The serum total cholesterol and low-density lipoprotein cholesterol levels were significantly lower (both p < 0.01) by 3.9 and 4.6%, respectively, after the chickpea-supplemented diet as compared with the wheat-supplemented diet. Protein (0.9% of energy, p = 0.01) and monounsaturated fat (3.3% of total fat, p < 0.001) intakes were slightly but significantly lower and the carbohydrate intake significantly higher (1.7% of energy, p < 0.001) on the chickpea-supplemented diet as compared with the wheat-supplemented diet. Multivariate analyses suggested that the differences in serum lipids were mainly due to small differences in polyunsaturated fatty acid and dietary fibre contents between the two intervention diets. CONCLUSIONS Inclusion of chickpeas in an intervention diet results in lower serum total and low-density lipoprotein cholesterol levels as compared with a wheat-supplemented diet.
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Affiliation(s)
- J K Pittaway
- School of Human Life Sciences, University of Tasmania, Launceston, Tas., Australia
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31
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Abstract
OBJECTIVE To determine whether the two major isoflavones in red clover differ in their effect on low-density lipoprotein cholesterol (LDL-C). DESIGN A randomised, placebo-controlled, double-blind trial; two parallel groups taking one of the two isoflavones within which treatment and placebo were administered in a crossover design. SETTING Free-living volunteers. SUBJECTS A total of 46 middle-aged men and 34 postmenopausal women. INTERVENTION Two mixtures of red clover isoflavones enriched in either biochanin (n=40) or formononetin (n=40) were compared. Placebo and active treatment (40 mg/day) were administered for 6 weeks each in a crossover design within the two parallel groups. MAIN OUTCOME MEASURES Plasma lipids were measured twice at the end of each period. RESULTS Baseline LDL-C concentrations did not differ significantly between men (n=46) and women (n=34), nor between those randomised to biochanin or formononetin. Interaction between time and treatments, biochanin, formononetin and corresponding placebos (two-way ANOVA) on LDL-C showed a significant effect of biochanin treatment alone. The biochanin effect was confined to men; median LDL-C was 3.61 (3.05-4.14) mmol/l with biochanin and 3.99 (3.16-4.29) mmol/l with the corresponding placebo (RM ANOVA with Dunnett's adjustment P<0.05). The difference between placebo and biochanin effects on LDL-C was 9.5%. No other lipid was affected and women failed to respond significantly to treatment. CONCLUSION Isolated isoflavones from red clover enriched in biochanin (genistein precursor) but not in formononetin (daidzein precursor), lowered LDL-C in men. This may partly explain the previous failure to demonstrate cholesterol-lowering effects with mixed isoflavones studied predominantly in women. SPONSORSHIP Novogen Ltd, North Ryde NSW, Australia, provided partial support including provision of tablets and outside monitoring.
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Affiliation(s)
- P Nestel
- Baker Medical Research Institute Wynn Domain, Monash University, Melbourne, Australia.
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32
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Georgopoulos SE, Arvanitis DP, Tekerlekis P, Chronopoulos A, Kostakopoulos A. Rupture of an aortic anastomotic aneurysm into a ureter. Urol Int 2003; 71:333-5. [PMID: 14512661 DOI: 10.1159/000072692] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2001] [Accepted: 03/22/2002] [Indexed: 11/19/2022]
Abstract
A case of rupture of a false aneurysm of the distal aorta into the left ureter is reported. The patient presented with purulent hydronephrosis and hematuria. A left aorto-femoral graft had been inserted 3 years earlier, which became infected and was then removed. After 2 years a false distal aortic aneurysm developed, and in the last 6 months recurrent episodes of hematuria have occurred. An aorto-ureteric fistula was confirmed at surgery, and a left nephrostomy was performed with proximal and distal ligation of the ureter and then aneurysmectomy followed by aorto-bifemoral bypass.
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Affiliation(s)
- S E Georgopoulos
- Department of Vascular Surgery, Sismanoglio Hospital, Athens, Greece.
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33
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Georgopoulos SE, Chronopoulos A, Dervisis KI, Arvanitis DP. Paradoxical embolism. An old but, paradoxically, under-estimated problem. J Cardiovasc Surg (Torino) 2001; 42:675-7. [PMID: 11562599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
The theoretical model of paradoxical embolism requires the presence of four parameters, namely, arterial embolism, venous thrombus, abnormal intracardiac communication and right-to-left shunt. Many aspects, however, of this well known entity are under consideration; diagnosis is often difficult to be established and the long term efficacy of preventive measures is undefined. We comment on a case report of recurrent paradoxical embolism with popliteal vein thrombosis and patent foramen ovale, and we briefly review the literature.
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Affiliation(s)
- S E Georgopoulos
- Department of Vascular Surgery, Sismanoglio Hospital, 12, Riga Fereou Street, 16674 Glyfada, Athens, Greece
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34
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Kennelly S, Dorfman W, Chronopoulos A, Burns W. The frequency of neuropsychological complaints and their relationship to the MMPIA clinical scales. Arch Clin Neuropsychol 1996. [DOI: 10.1093/arclin/11.5.406a] [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: 11/12/2022] Open
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Mikati MA, Holmes GL, Chronopoulos A, Hyde P, Thurber S, Gatt A, Liu Z, Werner S, Stafstrom CE. Phenobarbital modifies seizure-related brain injury in the developing brain. Ann Neurol 1994; 36:425-33. [PMID: 8080250 DOI: 10.1002/ana.410360314] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
To investigate the potential role of drug therapy in preventing or exacerbating seizure-related brain injury in the prepubescent brain, we administered kainic acid to rats at postnatal day 35. Therapy with daily phenobarbital was started directly before or 1 day after kainic acid was administered, and was continued through postnatal day 153. Rats receiving phenobarbital had therapeutic concentrations during most of the 24-hour dosing period, but also experienced supratherapeutic peak concentrations. The animals were subsequently tested using the water maze (a measure of visuospatial memory), open field (a measure of activity level), and handling tests (a measure of emotionality). The frequency of spontaneous recurrent seizures was monitored during and after phenobarbital therapy. Kainic acid resulted in status epilepticus on postnatal day 35 in all the rats that received it but those receiving phenobarbital first manifested a shorter and less severe status epilepticus as compared to the rats given kainic acid alone. Rats starting phenobarbital immediately before kainic acid was administered did not differ from control rats on behavioral testing and had no subsequent spontaneous recurrent seizures and no histological lesions. Rats receiving kainic acid alone performed significantly poorer than did control rats in the water maze, were more aggressive, had histological lesions, and manifested spontaneous recurrent seizures. As compared to the group treated only with kainic acid, rats receiving kainic acid followed by phenobarbital at postnatal days 36 to 153 manifested similar aggressiveness and histological lesions, similar frequency of spontaneous recurrent seizures after phenobarbital taper, and even greater disturbances in memory, learning, and activity level.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M A Mikati
- Department of Neurology, Harvard Medical School, Children's Hospital, Boston, MA
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36
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Holmes GL, Chronopoulos A, Stafstrom CE, Mikati MA, Thurber SJ, Hyde PA, Thompson JL. Effects of kindling on subsequent learning, memory, behavior, and seizure susceptibility. Brain Res Dev Brain Res 1993; 73:71-7. [PMID: 8513557 DOI: 10.1016/0165-3806(93)90047-e] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
To determine the long-term effects of seizures on the developing brain we kindled 20-, 40-, and 60-day-old rats to stage 5 seizures and then elicited an additional 15 seizures using the same kindling stimulation. At age 80 days, all animals that reached stage 5 kindling, and their respective age-matched controls, underwent behavioral testing using the Morris water maze, open field test, and handling test. Prior to euthanasia the animals had seizure threshold tested using flurothyl inhalation. No differences were noted in time to platform in the water maze or activity level in the open field test between the kindled rats and controls in any of the three age groups. Rats kindled at age 20 and 40 were more emotional than the controls in the handling test. In the flurothyl inhalation test, rats kindled at 40 and 60 days of age had a shorter latency to all seizures stages than the controls. These results demonstrate that while kindling results in no alteration of learning, memory, or activity level, it does result in altered emotionality and activity level in immature animals, as well as reduced seizure threshold in pubescent and mature rats. The animal model used appears to be an important variable in determining the long-term effects of seizures.
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Affiliation(s)
- G L Holmes
- Department of Neurology, Harvard Medical School, Children's Hospital, Boston, MA 02115
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37
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Abstract
The long-term behavioral and cognitive effects of seizures at different ages were studied using the kainic acid (KA) seizure model. Rats of postnatal (P) ages (in days) 5, 10, 20, 30, and 60 were administered KA intraperitoneally (i.p.), which induced status epilepticus for several hours, or an equivalent volume of saline. Occurrence of spontaneous recurrent seizures (SRS) was then monitored for 3 months by a closed-circuit videotaping system. Rats began behavioral testing on P80; a separate group of rats that received KA on P60 began testing on P120. Behavioral tests included the Morris water maze (visuospatial learning and memory), the open field test (response to a novel environment), and the handling test (emotionality). When tested on P80, KA-treated P5 and P10 rats had no demonstrable deficits on any test as compared with controls. KA-Treated P20 rats differed from controls only on the water maze spatial bias test. KA-Treated P30 rats had deficits in spatial bias, were more active in the open field, and were more aggressive when handled. KA-Treated P60 rats, whether tested on P80 or P120, had deficits in learning platform position and spatial bias in the water maze, were more active in the open field, and were more aggressive when handled. P60 rats with SRS performed poorer in water maze place learning and spatial bias testing, although the number of SRS did not correlate with overall task acquisition. Our findings suggest age-related behavioral and cognitive deficits after KA-induced seizures. Pubescents and adults had alterations in learning, memory, exploratory behavior, and response to handling, whereas younger animals had no obvious behavioral or cognitive deficits.
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Affiliation(s)
- C E Stafstrom
- Department of Neurology, Children's Hospital, Harvard Medical School, Boston, Massachusetts
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38
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Abstract
Felbamate (FBM), a newly developed antiepileptic drug (AED), was previously shown to offer some neuroprotective effects against hypoxic injury in both in vivo and in vitro studies. We administered FBM (100 or 300 mg/kg) to 30-day-old rats 1 h after they received a convulsant dosage of kainic acid (KA). Animals were then tested at age 80 days in the water maze, open field, and handling tests. Seizure latency was then tested by flurothyl inhalation. Animals that received 300 mg/kg FBM performed better in all three tests and had longer latencies to flurothyl-induced seizures than did animals that received vehicle. This study suggests that FBM may have some neuroprotective effects after KA-induced status epilepticus (SE).
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Affiliation(s)
- A Chronopoulos
- Department of Neurology, Harvard Medical School, Boston, Massachusetts
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39
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Thurber S, Chronopoulos A, Stafstrom CE, Holmes GL. Behavioral effects of continuous hippocampal stimulation in the developing rat. Brain Res Dev Brain Res 1992; 68:35-40. [PMID: 1521323 DOI: 10.1016/0165-3806(92)90245-r] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
There is controversy as to whether prolonged seizures are more detrimental to the immature than the mature brain. To evaluate this question continuous hippocampal stimulation was used to induce prolonged limbic seizures in 20-, 30- and 60-day-old rats. The long-term effects on learning and activity level were then studied at age 80 days using the Morris water maze, a test of spatial learning and memory, and the open field test, a test of an animal's reaction to a novel environment. Limbic status epilepticus in 60-day-old but not 20- and 30-day-old rats caused long-term impairment of learning in the Morris water maze. No differences were noted between the control and the experimental animals in the open field test. These results suggest that the age of seizure onset is an important determinant of long-term cognitive sequelae.
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Affiliation(s)
- S Thurber
- Department of Neurology, Harvard Medical School, Children's Hospital, Boston, MA 02115
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