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Haider MS, Mahato AK, Kotliarova A, Forster S, Böttcher B, Stahlhut P, Sidorova Y, Luxenhofer R. Biological Activity In Vitro, Absorption, BBB Penetration, and Tolerability of Nanoformulation of BT44:RET Agonist with Disease-Modifying Potential for the Treatment of Neurodegeneration. Biomacromolecules 2023; 24:4348-4365. [PMID: 36219820 PMCID: PMC10565809 DOI: 10.1021/acs.biomac.2c00761] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 09/17/2022] [Indexed: 11/29/2022]
Abstract
BT44 is a novel, second-generation glial cell line-derived neurotropic factor mimetic with improved biological activity and is a lead compound for the treatment of neurodegenerative disorders. Like many other small molecules, it suffers from intrinsic poor aqueous solubility, posing significant hurdles at various levels for its preclinical development and clinical translation. Herein, we report a poly(2-oxazoline)s (POx)-based BT44 micellar nanoformulation with an ultrahigh drug-loading capacity of 47 wt %. The BT44 nanoformulation was comprehensively characterized by 1H NMR spectroscopy, differential scanning calorimetry (DSC), powder X-ray diffraction (XRD), dynamic light scattering (DLS), and cryo-transmission/scanning electron microscopy (cryo-TEM/SEM). The DSC, XRD, and redispersion studies collectively confirmed that the BT44 formulation can be stored as a lyophilized powder and can be redispersed upon need. The DLS suggested that the redispersed formulation is suitable for parenteral administration (Dh ≈ 70 nm). The cryo-TEM measurements showed the presence of wormlike structures in both the plain polymer and the BT44 formulation. The BT44 formulation retained biological activity in immortalized cells and in cultured dopamine neurons. The micellar nanoformulation of BT44 exhibited improved absorption (after subcutaneous injection) and blood-brain barrier (BBB) penetration, and no acute toxic effects in mice were observed. In conclusion, herein, we have developed an ultrahigh BT44-loaded aqueous injectable nanoformulation, which can be used to pave the way for its preclinical and clinical development for the management of neurodegenerative disorders.
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Affiliation(s)
- Malik Salman Haider
- Functional
Polymer Materials, Chair for Advanced Materials Synthesis, Institute
for Functional Materials and Biofabrication, Department of Chemistry
and Pharmacy, Julius-Maximilians-University
Würzburg, Röntgenring
11, 97070Würzburg, Germany
- University
Hospital of Würzburg, Department of Ophthalmology, Josef-Schneider-Street 11, D-97080Würzburg, Germany
| | - Arun Kumar Mahato
- Laboratory
of Molecular Neuroscience, Institute of Biotechnology, HiLIFE, University of Helsinki, 00014Helsinki, Finland
| | - Anastasiia Kotliarova
- Laboratory
of Molecular Neuroscience, Institute of Biotechnology, HiLIFE, University of Helsinki, 00014Helsinki, Finland
| | - Stefan Forster
- Functional
Polymer Materials, Chair for Advanced Materials Synthesis, Institute
for Functional Materials and Biofabrication, Department of Chemistry
and Pharmacy, Julius-Maximilians-University
Würzburg, Röntgenring
11, 97070Würzburg, Germany
| | - Bettina Böttcher
- Biocenter
and Rudolf Virchow Centre, Julius-Maximilians-University
Würzburg, Haus
D15, Josef-Schneider-Strasse 2, 97080Würzburg, Germany
| | - Philipp Stahlhut
- Department
of Functional Materials in Medicine and Dentistry, Institute of Functional
Materials and Biofabrication and Bavarian Polymer Institute, Julius-Maximilians-University Würzburg, Pleicherwall 2, 97070Würzburg, Germany
| | - Yulia Sidorova
- Laboratory
of Molecular Neuroscience, Institute of Biotechnology, HiLIFE, University of Helsinki, 00014Helsinki, Finland
| | - Robert Luxenhofer
- Functional
Polymer Materials, Chair for Advanced Materials Synthesis, Institute
for Functional Materials and Biofabrication, Department of Chemistry
and Pharmacy, Julius-Maximilians-University
Würzburg, Röntgenring
11, 97070Würzburg, Germany
- Soft
Matter Chemistry, Department of Chemistry, and Helsinki Institute
of Sustainability Science, Faculty of Science, University of Helsinki, PB 55-00014Helsinki, Finland
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2
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Forster S, Radpour R, Ochsenbein AF. Molecular and immunological mechanisms of clonal evolution in multiple myeloma. Front Immunol 2023; 14:1243997. [PMID: 37744361 PMCID: PMC10516567 DOI: 10.3389/fimmu.2023.1243997] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 08/21/2023] [Indexed: 09/26/2023] Open
Abstract
Multiple myeloma (MM) is a hematologic malignancy characterized by the proliferation of clonal plasma cells in the bone marrow (BM). It is known that early genetic mutations in post-germinal center B/plasma cells are the cause of myelomagenesis. The acquisition of additional chromosomal abnormalities and distinct mutations further promote the outgrowth of malignant plasma cell populations that are resistant to conventional treatments, finally resulting in relapsed and therapy-refractory terminal stages of MM. In addition, myeloma cells are supported by autocrine signaling pathways and the tumor microenvironment (TME), which consists of diverse cell types such as stromal cells, immune cells, and components of the extracellular matrix. The TME provides essential signals and stimuli that induce proliferation and/or prevent apoptosis. In particular, the molecular pathways by which MM cells interact with the TME are crucial for the development of MM. To generate successful therapies and prevent MM recurrence, a thorough understanding of the molecular mechanisms that drive MM progression and therapy resistance is essential. In this review, we summarize key mechanisms that promote myelomagenesis and drive the clonal expansion in the course of MM progression such as autocrine signaling cascades, as well as direct and indirect interactions between the TME and malignant plasma cells. In addition, we highlight drug-resistance mechanisms and emerging therapies that are currently tested in clinical trials to overcome therapy-refractory MM stages.
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Affiliation(s)
- Stefan Forster
- Tumor Immunology, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Ramin Radpour
- Tumor Immunology, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Adrian F. Ochsenbein
- Tumor Immunology, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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3
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Hahn L, Zorn T, Kehrein J, Kielholz T, Ziegler AL, Forster S, Sochor B, Lisitsyna ES, Durandin NA, Laaksonen T, Aseyev V, Sotriffer C, Saalwächter K, Windbergs M, Pöppler AC, Luxenhofer R. Unraveling an Alternative Mechanism in Polymer Self-Assemblies: An Order-Order Transition with Unusual Molecular Interactions between Hydrophilic and Hydrophobic Polymer Blocks. ACS Nano 2023; 17:6932-6942. [PMID: 36972400 PMCID: PMC10100562 DOI: 10.1021/acsnano.3c00722] [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] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 03/15/2023] [Indexed: 06/18/2023]
Abstract
Polymer self-assembly leading to cooling-induced hydrogel formation is relatively rare for synthetic polymers and typically relies on H-bonding between repeat units. Here, we describe a non-H-bonding mechanism for a cooling-induced reversible order-order (sphere-to-worm) transition and related thermogelation of solutions of polymer self-assemblies. A multitude of complementary analytical tools allowed us to reveal that a significant fraction of the hydrophobic and hydrophilic repeat units of the underlying block copolymer is in close proximity in the gel state. This unusual interaction between hydrophilic and hydrophobic blocks reduces the mobility of the hydrophilic block significantly by condensing the hydrophilic block onto the hydrophobic micelle core, thereby affecting the micelle packing parameter. This triggers the order-order transition from well-defined spherical micelles to long worm-like micelles, which ultimately results in the inverse thermogelation. Molecular dynamics modeling indicates that this unexpected condensation of the hydrophilic corona onto the hydrophobic core is due to particular interactions between amide groups in the hydrophilic repeat units and phenyl rings in the hydrophobic ones. Consequently, changes in the structure of the hydrophilic blocks affecting the strength of the interaction could be used to control macromolecular self-assembly, thus allowing for the tuning of gel characteristics such as strength, persistence, and gelation kinetics. We believe that this mechanism might be a relevant interaction pattern for other polymeric materials as well as their interaction in and with biological environments. For example, controlling the gel characteristics could be considered important for applications in drug delivery or biofabrication.
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Affiliation(s)
- Lukas Hahn
- Institute
for Functional Materials and Biofabrication, Department of Chemistry
and Pharmacy, Julius-Maximilians-University
Würzburg, Röntgenring 11, 97070 Würzburg, Germany
- Institute
of Pharmacy and Food Chemistry, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Theresa Zorn
- Center
for Nanosystems Chemistry & Institute of Organic Chemistry, Department
of Chemistry and Pharmacy, Julius-Maximilians-University
Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Josef Kehrein
- Institute
of Pharmacy and Food Chemistry, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Tobias Kielholz
- Institute
of Pharmaceutical Technology and Buchmann Institute for Molecular
Life Sciences, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany
| | - Anna-Lena Ziegler
- Institute
for Functional Materials and Biofabrication, Department of Chemistry
and Pharmacy, Julius-Maximilians-University
Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Stefan Forster
- Institute
for Functional Materials and Biofabrication, Department of Chemistry
and Pharmacy, Julius-Maximilians-University
Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Benedikt Sochor
- Chair for
X-Ray Microscopy, Julius-Maximilians-University
Würzburg, Josef-Martin-Weg
63, 97074 Würzburg, Germany
| | - Ekaterina S. Lisitsyna
- Faculty
of Engineering and Natural Science, Tampere
University, Korkeakoulunkatu 8, 33720 Tampere, Finland
| | - Nikita A. Durandin
- Faculty
of Engineering and Natural Science, Tampere
University, Korkeakoulunkatu 8, 33720 Tampere, Finland
| | - Timo Laaksonen
- Faculty
of Engineering and Natural Science, Tampere
University, Korkeakoulunkatu 8, 33720 Tampere, Finland
- Division
of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5 E, 00014 Helsinki, Finland
| | - Vladimir Aseyev
- Soft
Matter Chemistry, Department of Chemistry, Helsinki Institute of Sustainability
Science, Faculty of Science, University
of Helsinki, 00014 Helsinki, Finland
| | - Christoph Sotriffer
- Institute
of Pharmacy and Food Chemistry, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Kay Saalwächter
- Institute
of Physics-NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, 06120 Halle, Germany
| | - Maike Windbergs
- Institute
of Pharmaceutical Technology and Buchmann Institute for Molecular
Life Sciences, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany
| | - Ann-Christin Pöppler
- Center
for Nanosystems Chemistry & Institute of Organic Chemistry, Department
of Chemistry and Pharmacy, Julius-Maximilians-University
Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Robert Luxenhofer
- Institute
for Functional Materials and Biofabrication, Department of Chemistry
and Pharmacy, Julius-Maximilians-University
Würzburg, Röntgenring 11, 97070 Würzburg, Germany
- Soft
Matter Chemistry, Department of Chemistry, Helsinki Institute of Sustainability
Science, Faculty of Science, University
of Helsinki, 00014 Helsinki, Finland
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Ouillon N, Forster S, Timm S, Jarrett A, Otto S, Rehder G, Sokolova IM. Effects of different oxygen regimes on ecological performance and bioenergetics of a coastal marine bioturbator, the soft shell clam Mya arenaria. Sci Total Environ 2023; 860:160459. [PMID: 36435244 DOI: 10.1016/j.scitotenv.2022.160459] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 11/17/2022] [Accepted: 11/20/2022] [Indexed: 06/16/2023]
Abstract
Benthic species are exposed to oxygen fluctuations that can affect their performance and survival. Physiological effects and ecological consequences of fluctuating oxygen are not well understood in marine bioturbators such as the soft-shell clam Mya arenaria. We explored the effects of different oxygen regimes (21 days of exposure to constant hypoxia (~4.1 kPa PO2), cyclic hypoxia (~2.1-~10.4 kPa PO2) or normoxia (~21 kPa PO2)) on energy metabolism, oxidative stress and ecological behaviors (bioirrigation and bioturbation) of M. arenaria. Constant hypoxia and post-hypoxic recovery in cyclic hypoxia led to oxidative injury of proteins and lipids, respectively. Clams acclimated to constant hypoxia maintained aerobic capacity similar to the normoxic clams. In contrast, clams acclimated to cyclic hypoxia suppressed aerobic metabolism and activated anaerobiosis during hypoxia, and strongly upregulated aerobic metabolism during recovery. Constant hypoxia led to decreased lipid content, whereas in cyclic hypoxia proteins and glycogen accumulated during recovery and were broken down during the hypoxic phase. Digging of clams was impaired by constant and cyclic hypoxia, and bioirrigation was also suppressed under constant hypoxia. Overall, cyclic hypoxia appears less stressful for M. arenaria due to the metabolic flexibility that ensures recovery during reoxygenation and mitigates the negative effects of hypoxia, whereas constant hypoxia leads to depletion of energy reserves and impairs ecological functions of M. arenaria potentially leading to negative ecological consequences in benthic ecosystems.
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Affiliation(s)
- Natascha Ouillon
- Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany
| | - Stefan Forster
- Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany; Department of Maritime Systems, Interdisciplinary Faculty, University of Rostock, Rostock, Germany
| | - Stefan Timm
- Department of Plant Physiology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany
| | - Abigail Jarrett
- Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany
| | - Stefan Otto
- Department of Marine Chemistry, Leibniz Institute for Baltic Research, Rostock 18119, Germany
| | - Gregor Rehder
- Department of Marine Chemistry, Leibniz Institute for Baltic Research, Rostock 18119, Germany; Department of Maritime Systems, Interdisciplinary Faculty, University of Rostock, Rostock, Germany
| | - Inna M Sokolova
- Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock 18057, Germany; Department of Maritime Systems, Interdisciplinary Faculty, University of Rostock, Rostock, Germany.
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5
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Bräutigam K, Reinhard S, Wartenberg M, Forster S, Greif K, Granai M, Bösmüller H, Klingel K, Schürch CM. Comprehensive analysis of SARS-CoV-2 receptor proteins in human respiratory tissues identifies alveolar macrophages as potential virus entry site. Histopathology 2023; 82:846-859. [PMID: 36700825 DOI: 10.1111/his.14871] [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] [Received: 09/12/2022] [Revised: 01/15/2023] [Accepted: 01/23/2023] [Indexed: 01/27/2023]
Abstract
AIMS COVID-19 has had enormous consequences on global health-care and has resulted in millions of fatalities. The exact mechanism and site of SARS-CoV-2 entry into the body remains insufficiently understood. Recently, novel virus receptors were identified, and alveolar macrophages were suggested as a potential viral entry cell type and vector for intra-alveolar virus transmission. Here, we investigated the protein expression of 10 well-known and novel virus entry molecules along potential entry sites in humans using immunohistochemistry. METHODS AND RESULTS Samples of different anatomical sites from up to 93 patients were incorporated into tissue microarrays. Protein expression of ACE2, TMPRSS2, furin, CD147, C-type lectin receptors (CD169, CD209, CD299), neuropilin-1, ASGR1 and KREMEN1 were analysed. In lung tissues, at least one of the three receptors ACE2, ASGR1 or KREMEN1 was expressed in the majority of cases. Moreover, all the investigated molecules were found to be expressed in alveolar macrophages, and co-localisation with SARS-CoV-2 N-protein was demonstrated using dual immunohistochemistry in lung tissue from a COVID-19 autopsy. While CD169 and CD209 showed consistent protein expression in sinonasal, conjunctival and bronchiolar tissues, neuropilin-1 and ASGR1 were mostly absent, suggesting a minor relevance of these two molecules at these specific sites. CONCLUSION Our results extend recent discoveries indicating a role for these molecules in virus entry at different anatomical sites. Moreover, they support the notion of alveolar macrophages being a potential entry cell for SARS-CoV-2.
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Affiliation(s)
| | - Stefan Reinhard
- Institute of Pathology, University of Bern, Bern, Switzerland
| | | | - Stefan Forster
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Karen Greif
- Department of Pathology and Neuropathology, University Hospital and Comprehensive Cancer Center Tübingen, Tübingen, Germany
| | - Massimo Granai
- Department of Pathology and Neuropathology, University Hospital and Comprehensive Cancer Center Tübingen, Tübingen, Germany
| | - Hans Bösmüller
- Department of Pathology and Neuropathology, University Hospital and Comprehensive Cancer Center Tübingen, Tübingen, Germany
| | - Karin Klingel
- Department of Pathology and Neuropathology, University Hospital and Comprehensive Cancer Center Tübingen, Tübingen, Germany
| | - Christian M Schürch
- Department of Pathology and Neuropathology, University Hospital and Comprehensive Cancer Center Tübingen, Tübingen, Germany
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6
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Esposito R, Polidori T, Meise DF, Pulido-Quetglas C, Chouvardas P, Forster S, Schaerer P, Kobel A, Schlatter J, Kerkhof E, Roemmele M, Rice ES, Zhu L, Lanzós A, Guillen-Ramirez HA, Basile G, Carrozzo I, Vancura A, Ullrich S, Andrades A, Harvey D, Medina PP, Ma PC, Haefliger S, Wang X, Martinez I, Ochsenbein AF, Riether C, Johnson R. Multi-hallmark long noncoding RNA maps reveal non-small cell lung cancer vulnerabilities. Cell Genom 2022; 2:100171. [PMID: 36778670 PMCID: PMC9903773 DOI: 10.1016/j.xgen.2022.100171] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 06/15/2022] [Accepted: 08/01/2022] [Indexed: 12/24/2022]
Abstract
Long noncoding RNAs (lncRNAs) are widely dysregulated in cancer, yet their functional roles in cancer hallmarks remain unclear. We employ pooled CRISPR deletion to perturb 831 lncRNAs detected in KRAS-mutant non-small cell lung cancer (NSCLC) and measure their contribution to proliferation, chemoresistance, and migration across two cell backgrounds. Integrative analysis of these data outperforms conventional "dropout" screens in identifying cancer genes while prioritizing disease-relevant lncRNAs with pleiotropic and background-independent roles. Altogether, 80 high-confidence oncogenic lncRNAs are active in NSCLC, which tend to be amplified and overexpressed in tumors. A follow-up antisense oligonucleotide (ASO) screen shortlisted two candidates, Cancer Hallmarks in Lung LncRNA 1 (CHiLL1) and GCAWKR, whose knockdown consistently suppressed cancer hallmarks in two- and three-dimension tumor models. Molecular phenotyping reveals that CHiLL1 and GCAWKR control cellular-level phenotypes via distinct transcriptional networks. This work reveals a multi-dimensional functional lncRNA landscape underlying NSCLC that contains potential therapeutic vulnerabilities.
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Affiliation(s)
- Roberta Esposito
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland,Institute of Genetics and Biophysics “Adriano Buzzati-Traverso” CNR, Naples 80131, Italy
| | - Taisia Polidori
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland,Graduate School of Cellular and Biomedical Sciences, University of Bern, Bern 3012, Switzerland
| | - Dominik F. Meise
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Carlos Pulido-Quetglas
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland,Graduate School of Cellular and Biomedical Sciences, University of Bern, Bern 3012, Switzerland
| | - Panagiotis Chouvardas
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Stefan Forster
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Paulina Schaerer
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Andrea Kobel
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Juliette Schlatter
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Erik Kerkhof
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Michaela Roemmele
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Emily S. Rice
- Department of Microbiology, Immunology, and Cell Biology, Morgantown, WV, USA
| | - Lina Zhu
- Department of Surgery, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong,Tung Biomedical Sciences Centre, City University of Hong Kong, Hong Kong,Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China
| | - Andrés Lanzós
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland,Graduate School of Cellular and Biomedical Sciences, University of Bern, Bern 3012, Switzerland
| | - Hugo A. Guillen-Ramirez
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland,School of Biology and Environmental Science, University College Dublin, Dublin D04 V1W8, Ireland,Conway Institute for Biomolecular and Biomedical Research, University College Dublin, Dublin D04 V1W8, Ireland
| | - Giulia Basile
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Irene Carrozzo
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Adrienne Vancura
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Sebastian Ullrich
- Centre for Genomic Regulation (CRG), The Barcelona Institute for Science and Technology (BIST), Barcelona, Catalonia 08003, Spain
| | - Alvaro Andrades
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, Granada 18016, Spain,Instituto de Investigación Biosanitaria, Granada 18014, Spain,Department of Biochemistry and Molecular Biology I, University of Granada, Granada 18071, Spain
| | - Dylan Harvey
- School of Biology and Environmental Science, University College Dublin, Dublin D04 V1W8, Ireland
| | - Pedro P. Medina
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, Granada 18016, Spain,Instituto de Investigación Biosanitaria, Granada 18014, Spain,Department of Biochemistry and Molecular Biology I, University of Granada, Granada 18071, Spain
| | | | - Simon Haefliger
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Xin Wang
- Department of Surgery, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong
| | - Ivan Martinez
- Department of Microbiology, Immunology, and Cell Biology, Morgantown, WV, USA
| | - Adrian F. Ochsenbein
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Carsten Riether
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
| | - Rory Johnson
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3010 Switzerland,Department for BioMedical Research, University of Bern, Bern 3008, Switzerland,School of Biology and Environmental Science, University College Dublin, Dublin D04 V1W8, Ireland,Conway Institute for Biomolecular and Biomedical Research, University College Dublin, Dublin D04 V1W8, Ireland,Corresponding author
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7
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Gogina M, Renz JR, Forster S, Zettler ML. Benthic Macrofauna Community Bioirrigation Potential (BIPc): Regional Map and Utility Validation for the South-Western Baltic Sea. Biology 2022; 11:biology11071085. [PMID: 36101463 PMCID: PMC9312502 DOI: 10.3390/biology11071085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/18/2022] [Accepted: 07/18/2022] [Indexed: 11/20/2022]
Abstract
Simple Summary The sediments on the seafloor are inhabited by multiple macroscopic organisms such as shells and worms, which, among other things, influence the biogeochemical cycling by flushing the near-bottom water through their gangways. This is called bioirrigation, one of key processes in the functioning of marine sediments. The density of animals, in addition to the features (or traits) of each species, define their specific contributions to this process. Measuring the intensity of this rather dynamic process in nature is difficult and costly; therefore, the available direct observations are too scarce for large-scale assessments. However, such assessments are essential for broadening our understanding of ecosystem functioning, and of the role that biodiversity plays in it. To address this shortage of observational data, a traits-based index “BIPc” that expresses the bioirrigation potential, based on available data on sediment-dwelling animals, comes into play. In this paper, we focus on the performance of the BIPc index in the south-western Baltic Sea, and on how it changes in space and time. The results support the usefulness of this index, but also highlight its existing limitations. Modelled distribution map layers of the bioirrigation potential and scores for 120 key species required for index calculation are made available for reuse. Abstract Benthic community bioirrigation potential (BIPc), an index developed to quantify the anticipated capacity of macrofauna to influence the solute exchange at the sediment–water interface, was calculated for the south-western Baltic Sea. This index can be regarded as an effect trait that is useful for predicting ecosystem processes impacted by animal burrow ventilation. The special feature, and presumably an advantage, of BIPc, compared to alternative recently developed benthic macrofauna-based bioirrigation indices, lies in its ability to distinguish the taxa-specific score values between diffusion- and advection-dominated sediment systems. The usefulness of the BIPc index was compared against the estimates of the well-established community bioturbation potential index (BPc). The BIPc index displayed a moderately but significantly stronger correlation with estimates of irrigation rates derived from tracer experiments. Using a random forest machine learning approach and a number of available relevant environmental predictor layers, we have modelled and mapped the spatial differences in this ecosystem functioning expression. The key species contributing to bioirrigation potential in the study area were identified. The interannual variation in BIPc was assessed on a small exemplary dataset. The scores required to calculate the index, that were assigned to 120 taxa dominating abundance and biomass in the region, are provided for reuse. The utility, temporal variability and uncertainty of the distribution estimate are discussed.
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Affiliation(s)
- Mayya Gogina
- Leibniz Institute for Baltic Sea Research, Seestraße 15, 18119 Rostock, Germany;
- Correspondence: ; Tel.: +49-381-519-7393
| | - Judith Rahel Renz
- Marine Biology, Institute of Biological Sciences, University of Rostock, Albert-Einstein-Straße 3, 18059 Rostock, Germany; (J.R.R.); (S.F.)
| | - Stefan Forster
- Marine Biology, Institute of Biological Sciences, University of Rostock, Albert-Einstein-Straße 3, 18059 Rostock, Germany; (J.R.R.); (S.F.)
| | - Michael L. Zettler
- Leibniz Institute for Baltic Sea Research, Seestraße 15, 18119 Rostock, Germany;
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8
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Yang M, Haider MS, Forster S, Hu C, Luxenhofer R. Synthesis and Investigation of Chiral Poly(2,4-disubstituted-2-oxazoline)-Based Triblock Copolymers, Their Self-Assembly, and Formulation with Chiral and Achiral Drugs. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00229] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mengshi Yang
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Malik Salman Haider
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Stefan Forster
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Chen Hu
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Robert Luxenhofer
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
- Soft Matter Chemistry, Department of Chemistry and Helsinki Institute of Sustainability Science, Faculty of Science, University of Helsinki, P.O. Box 55, 00014 Helsinki, Finland
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9
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Forster S, Radpour R. Molecular Impact of the Tumor Microenvironment on Multiple Myeloma Dissemination and Extramedullary Disease. Front Oncol 2022; 12:941437. [PMID: 35847862 PMCID: PMC9284036 DOI: 10.3389/fonc.2022.941437] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 06/06/2022] [Indexed: 12/25/2022] Open
Abstract
Multiple myeloma (MM) is the most common malignant monoclonal disease of plasma cells. Aside from classical chemotherapy and glucocorticoids, proteasome inhibitors, immunomodulatory agents and monoclonal antibodies are used in the current treatment scheme of MM. The tumor microenvironment (TME) plays a fundamental role in the development and progression of numerous solid and non-solid cancer entities. In MM, the survival and expansion of malignant plasma cell clones heavily depends on various direct and indirect signaling pathways provided by the surrounding bone marrow (BM) niche. In a number of MM patients, single plasma cell clones lose their BM dependency and are capable to engraft at distant body sites or organs. The resulting condition is defined as an extramedullary myeloma (EMM). EMMs are highly aggressive disease stages linked to a dismal prognosis. Emerging literature demonstrates that the dynamic interactions between the TME and malignant plasma cells affect myeloma dissemination. In this review, we aim to summarize how the cellular and non-cellular BM compartments can promote plasma cells to exit their BM niche and metastasize to distant intra-or extramedullary locations. In addition, we list selected therapy concepts that directly target the TME with the potential to prevent myeloma spread.
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Affiliation(s)
- Stefan Forster
- Tumor Immunology, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Ramin Radpour
- Tumor Immunology, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
- *Correspondence: Ramin Radpour,
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10
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Hinterbrandner M, Rubino V, Stoll C, Forster S, Schnüriger N, Radpour R, Baerlocher GM, Ochsenbein AF, Riether C. Tnfrsf4-expressing regulatory T cells promote immune escape of chronic myeloid leukemia stem cells. JCI Insight 2021; 6:151797. [PMID: 34727093 PMCID: PMC8675189 DOI: 10.1172/jci.insight.151797] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [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: 05/26/2021] [Accepted: 10/27/2021] [Indexed: 11/17/2022] Open
Abstract
Leukemia stem cells (LSCs) promote the disease and seem resistant to therapy and immune control. Why LSCs are selectively resistant against elimination by CD8+ cytotoxic T cells (CTLs) is still unknown. In this study, we demonstrate that LSCs in chronic myeloid leukemia (CML) can be recognized and killed by CD8+ CTLs in vitro. However, Tregs, which preferentially localized close to CD8+ CTLs in CML BM, protected LSCs from MHC class I–dependent CD8+ CTL–mediated elimination in vivo. BM Tregs in CML were characterized by the selective expression of tumor necrosis factor receptor 4 (Tnfrsf4). Stimulation of Tnfrsf4 signaling did not deplete Tregs but reduced the capacity of Tregs to protect LSCs from CD8+ CTL–mediated killing. In the BM of newly diagnosed CML patients, TNFRSF4 mRNA levels were significantly increased and correlated with the expression of the Treg-restricted transcription factor FOXP3. Overall, these results identify Tregs as key regulators of immune escape of LSCs and TNFRSF4 as a potential target to reduce the function of Tregs and boost antileukemic immunity in CML.
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Affiliation(s)
| | - Viviana Rubino
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Carina Stoll
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Stefan Forster
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Noah Schnüriger
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - Ramin Radpour
- Department for BioMedical Research, University of Bern, Bern, Switzerland
| | | | | | - Carsten Riether
- Department for BioMedical Research, University of Bern, Bern, Switzerland
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11
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Hahn L, Keßler L, Polzin L, Fritze L, Forster S, Helten H, Luxenhofer R. ABA Type Amphiphiles with Poly(2‐benzhydryl‐2‐oxazine) Moieties: Synthesis, Characterization and Inverse Thermogelation. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202100114] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lukas Hahn
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilians‐University Würzburg Röntgenring 11 Würzburg 97070 Germany
| | - Larissa Keßler
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilians‐University Würzburg Röntgenring 11 Würzburg 97070 Germany
- Soft Matter Chemistry, Department of Chemistry and Helsinki Institute of Sustainability Science, Faculty of Science University of Helsinki P.O. Box 55 Helsinki 00014 Finland
| | - Lando Polzin
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilians‐University Würzburg Röntgenring 11 Würzburg 97070 Germany
| | - Lars Fritze
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB) Julius‐Maximilians‐University Würzburg Am Hubland Würzburg 97074 Germany
| | - Stefan Forster
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilians‐University Würzburg Röntgenring 11 Würzburg 97070 Germany
| | - Holger Helten
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB) Julius‐Maximilians‐University Würzburg Am Hubland Würzburg 97074 Germany
| | - Robert Luxenhofer
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilians‐University Würzburg Röntgenring 11 Würzburg 97070 Germany
- Soft Matter Chemistry, Department of Chemistry and Helsinki Institute of Sustainability Science, Faculty of Science University of Helsinki P.O. Box 55 Helsinki 00014 Finland
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12
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Hahn L, Karakaya E, Zorn T, Sochor B, Maier M, Stahlhut P, Forster S, Fischer K, Seiffert S, Pöppler AC, Detsch R, Luxenhofer R. An Inverse Thermogelling Bioink Based on an ABA-Type Poly(2-oxazoline) Amphiphile. Biomacromolecules 2021; 22:3017-3027. [PMID: 34100282 DOI: 10.1021/acs.biomac.1c00427] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Hydrogels are key components in several biomedical research areas such as drug delivery, tissue engineering, and biofabrication. Here, a novel ABA-type triblock copolymer comprising poly(2-methyl-2-oxazoline) as the hydrophilic A blocks and poly(2-phenethyl-2-oxazoline) as the aromatic and hydrophobic B block is introduced. Above the critical micelle concentration, the polymer self-assembles into small spherical polymer micelles with a hydrodynamic radius of approx 8-8.5 nm. Interestingly, this specific combination of hydrophilic and hydrophobic aromatic moieties leads to rapid thermoresponsive inverse gelation at polymer concentrations above a critical gelation concentration (20 wt %) into a macroporous hydrogel of densely packed micelles. This hydrogel exhibited pronounced viscoelastic solid-like properties, as well as extensive shear-thinning, rapid structure recovery, and good strain resistance properties. Excellent 3D-printability of the hydrogel at lower temperature opens a wide range of different applications, for example, in the field of biofabrication. In preliminary bioprinting experiments using NIH 3T3 cells, excellent cell viabilities of more than 95% were achieved. The particularly interesting feature of this novel material is that it can be used as a printing support in hybrid bioink systems and sacrificial bioink due to rapid dissolution at physiological conditions.
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Affiliation(s)
- Lukas Hahn
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, Würzburg 97070, Germany
| | - Emine Karakaya
- Institute of Biomaterials, Friedrich Alexander University of Erlangen-Nürnberg, Cauerstr. 6, Erlangen 91058, Germany
| | - Theresa Zorn
- Institute of Organic Chemistry, Julius-Maximilians-University Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Benedikt Sochor
- Chair for X-Ray Microscopy, Julius-Maximilians-University Würzburg, Josef-Martin-Weg 63, Würzburg 97074, Germany
| | - Matthias Maier
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, Würzburg 97070, Germany
| | - Philipp Stahlhut
- Department for Functional Materials in Medicine and Dentistry, Julius-Maximilians-University Würzburg, Pleicherwall 2, Würzburg 97070, Germany
| | - Stefan Forster
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, Würzburg 97070, Germany
| | - Karl Fischer
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, Mainz 55128, Germany
| | - Sebastian Seiffert
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, Mainz 55128, Germany
| | - Ann-Christin Pöppler
- Institute of Organic Chemistry, Julius-Maximilians-University Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Rainer Detsch
- Institute of Biomaterials, Friedrich Alexander University of Erlangen-Nürnberg, Cauerstr. 6, Erlangen 91058, Germany
| | - Robert Luxenhofer
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-University Würzburg, Röntgenring 11, Würzburg 97070, Germany.,Soft Matter Chemistry, Department of Chemistry and Helsinki Institute of Sustainability Science, Faculty of Science, University of Helsinki, Helsinki 00014, Finland
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13
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Forster S, Radpour R. Molecular Immunotherapy: Promising Approach to Treat Metastatic Colorectal Cancer by Targeting Resistant Cancer Cells or Cancer Stem Cells. Front Oncol 2020; 10:569017. [PMID: 33240813 PMCID: PMC7680905 DOI: 10.3389/fonc.2020.569017] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 06/19/2020] [Accepted: 10/08/2020] [Indexed: 12/17/2022] Open
Abstract
The immune system is able to recognize and eliminate tumor cells. Some tumors, including colorectal cancer (CRC), induce immune tolerance via different mechanisms of “immunoediting” and “immune evasion” and can thus escape immune surveillance. The impact of immunotherapy on cancer has been investigated for many years, but so far, the application was limited to few cancer types. Immuno-oncological therapeutic strategies against metastatic colorectal cancer (mCRC), the adaptive immune system activating approaches, offer a high potential for adaptation to the great heterogeneity of CRC. Moreover, novel treatment approaches are currently being tested that might specifically target the disease initiating and maintaining population of colorectal cancer stem cells (CSCs). In this review, we aim to summarize the current state of immune-oncology and tumor immunotherapy of patients with mCRC and discuss different therapeutic modalities that focus on the activation of tumor-specific T-cells and their perspectives such as tumor vaccination, checkpoint inhibition, and adoptive T-cell transfer or on the eradication of colorectal CSCs.
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Affiliation(s)
- Stefan Forster
- Tumor Immunology, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.,Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Ramin Radpour
- Tumor Immunology, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.,Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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14
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Haider MS, Lübtow MM, Endres S, Forster S, Flegler VJ, Böttcher B, Aseyev V, Pöppler AC, Luxenhofer R. Think Beyond the Core: Impact of the Hydrophilic Corona on Drug Solubilization Using Polymer Micelles. ACS Appl Mater Interfaces 2020; 12:24531-24543. [PMID: 32378873 DOI: 10.1021/acsami.9b22495] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Polymeric micelles are typically characterized as core-shell structures. The hydrophobic core is considered as a depot for hydrophobic molecules, and the corona-forming block acts as a stabilizing and solubilizing interface between the core and aqueous milieu. Tremendous efforts have been made to tune the hydrophobic block to increase the drug loading and stability of micelles, whereas the role of hydrophilic blocks is rarely investigated in this context, with poly(ethylene glycol) (PEG) being the gold standard of hydrophilic polymers. To better understand the role of the hydrophilic corona, a small library of structurally similar A-B-A-type amphiphiles based on poly(2-oxazoline)s and poly(2-oxazine)s is investigated by varying the hydrophilic block A utilizing poly(2-methyl-2-oxazoline) (pMeOx; A) or poly(2-ethyl-2-oxazoline) (pEtOx; A*). In terms of hydrophilicity, both polymers closely resemble PEG. The more hydrophobic block B bears either a poly(2-oxazoline) and poly(2-oxazine) backbone with C3 (propyl) and C4 (butyl) side chains. Surprisingly, major differences in loading capacities from A-B-A > A*-B-A > A*-B-A* is observed for the formulation with two poorly water-soluble compounds, curcumin and paclitaxel, highlighting the importance of the hydrophilic corona of polymer micelles used for drug formulation. The formulations are also characterized by various nuclear magnetic resonance spectroscopy methods, dynamic light scattering, cryogenic transmission electron microscopy, and (micro) differential scanning calorimetry. Our findings suggest that the interaction between the hydrophilic block and the guest molecule should be considered an important, but previously largely ignored, factor for the rational design of polymeric micelles.
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Affiliation(s)
- Malik Salman Haider
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis and Bavarian Polymer Institute, Faculty of Chemistry and Pharmacy, University of Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Michael M Lübtow
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis and Bavarian Polymer Institute, Faculty of Chemistry and Pharmacy, University of Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Sebastian Endres
- Institute of Organic Chemistry, Faculty of Chemistry and Pharmacy, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Stefan Forster
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis and Bavarian Polymer Institute, Faculty of Chemistry and Pharmacy, University of Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Vanessa J Flegler
- Biocenter and Rudolf Virchow Centre, University of Würzburg, Haus D15, Josef-Schneider-Str. 2, 97080 Würzburg, Germany
| | - Bettina Böttcher
- Biocenter and Rudolf Virchow Centre, University of Würzburg, Haus D15, Josef-Schneider-Str. 2, 97080 Würzburg, Germany
| | - Vladimir Aseyev
- Department of Chemistry, University of Helsinki, PB 55, Helsinki FIN-00014, Finland
| | - Ann-Christin Pöppler
- Institute of Organic Chemistry, Faculty of Chemistry and Pharmacy, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Robert Luxenhofer
- Functional Polymer Materials, Chair for Chemical Technology of Material Synthesis and Bavarian Polymer Institute, Faculty of Chemistry and Pharmacy, University of Würzburg, Röntgenring 11, 97070 Würzburg, Germany
- Department of Chemistry, University of Helsinki, PB 55, Helsinki FIN-00014, Finland
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15
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Hahn L, Maier M, Stahlhut P, Beudert M, Flegler V, Forster S, Altmann A, Töppke F, Fischer K, Seiffert S, Böttcher B, Lühmann T, Luxenhofer R. Inverse Thermogelation of Aqueous Triblock Copolymer Solutions into Macroporous Shear-Thinning 3D Printable Inks. ACS Appl Mater Interfaces 2020; 12:12445-12456. [PMID: 32142257 DOI: 10.1021/acsami.9b21282] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Amphiphilic block copolymers that undergo (reversible) physical gelation in aqueous media are of great interest in different areas including drug delivery, tissue engineering, regenerative medicine, and biofabrication. We investigated a small library of ABA-type triblock copolymers comprising poly(2-methyl-2-oxazoline) as the hydrophilic shell A and different aromatic poly(2-oxazoline)s and poly(2-oxazine)s cores B in an aqueous solution at different concentrations and temperatures. Interestingly, aqueous solutions of poly(2-methyl-2-oxazoline)-block-poly(2-phenyl-2-oxazine)-block-poly(2-methyl-2-oxazoline) (PMeOx-b-PPheOzi-b-PMeOx) undergo inverse thermogelation below a critical temperature by forming a reversible nanoscale wormlike network. The viscoelastic properties of the resulting gel can be conveniently tailored by the concentration and the polymer composition. Storage moduli of up to 110 kPa could be obtained while the material retains shear-thinning and rapid self-healing properties. We demonstrate three-dimensional (3D) printing of excellently defined and shape-persistent 24-layered scaffolds at different aqueous concentrations to highlight its application potential, e.g., in the research area of biofabrication. A macroporous microstructure, which is stable throughout the printing process, could be confirmed via cryo-scanning electron microscopy (SEM) analysis. The absence of cytotoxicity even at very high concentrations opens a wide range of different applications for this first-in-class material in the field of biomaterials.
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Affiliation(s)
- Lukas Hahn
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Department of Chemistry and Pharmacy and Bavarian Polymer Institute, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Matthias Maier
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Department of Chemistry and Pharmacy and Bavarian Polymer Institute, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Philipp Stahlhut
- Department for Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, 97070 Würzburg, Germany
| | - Matthias Beudert
- Institute of Pharmacy and Food Chemistry, Julius-Maximilians-University Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Vanessa Flegler
- Cryo-Electron Microscopy, Biocenter and Rudolf Virchow Center, Julius-Maximilians-University Würzburg, Josef-Schneider-Straße 2, 97080 Würzburg, Germany
| | - Stefan Forster
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Department of Chemistry and Pharmacy and Bavarian Polymer Institute, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Alexander Altmann
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Department of Chemistry and Pharmacy and Bavarian Polymer Institute, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Fabian Töppke
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Department of Chemistry and Pharmacy and Bavarian Polymer Institute, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Karl Fischer
- Physical Chemistry of Polymers, Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Sebastian Seiffert
- Physical Chemistry of Polymers, Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Bettina Böttcher
- Cryo-Electron Microscopy, Biocenter and Rudolf Virchow Center, Julius-Maximilians-University Würzburg, Josef-Schneider-Straße 2, 97080 Würzburg, Germany
| | - Tessa Lühmann
- Institute of Pharmacy and Food Chemistry, Julius-Maximilians-University Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Robert Luxenhofer
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Department of Chemistry and Pharmacy and Bavarian Polymer Institute, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
- Soft Matter Chemistry, Department of Chemistry, Helsinki University, 00014 Helsinki, Finland
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16
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Gregory S, Bunnik EM, Callado AB, Carrie I, De Boer C, Duffus J, Fauria K, Forster S, Gove D, Knezevic I, Laquidain A, Pennetier D, Saunders S, Sparks S, Rice J, Ritchie CW, Milne R. Involving research participants in a pan-European research initiative: the EPAD participant panel experience. Res Involv Engagem 2020; 6:62. [PMID: 33088590 PMCID: PMC7566117 DOI: 10.1186/s40900-020-00236-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 10/01/2020] [Indexed: 05/13/2023]
Abstract
BACKGROUND Including participants in patient and public involvement activities is increasingly acknowledged as a key pillar of successful research activity. Such activities can influence recruitment and retention, as well as researcher experience and contribute to decision making in research studies. However, there are few established methodologies of how to set up and manage participant involvement activities. Further, there is little discussion of how to do so when dealing with collaborative projects that run across countries and operate in multiple linguistic and regulatory contexts. METHODS In this paper we describe the set-up, running and experiences of the EPAD participant panel. The EPAD study was a pan-European cohort study with the aim to understand risks for developing Alzheimer's disease and build a readiness cohort for Phase 2 clinical trials. Due to the longitudinal nature of this study, combined with the enrolment of healthy volunteers and those with mild cognitive impairments, the EPAD team highlighted participant involvement as crucial to the success of this project. The EPAD project employed a nested model, with local panels meeting in England, France, Scotland, Spain and The Netherlands, and feeding into a central study panel. The local panels were governed by terms of reference which were adaptable to local needs. RESULTS The impact of the panels has been widespread, and varies from feedback on documentation, to supporting with design of media materials and representation of the project at national and international meetings. CONCLUSIONS The EPAD panels have contributed to the success of the project and the model established is easily transferable to other disease areas investigating healthy or at-risk populations.
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Affiliation(s)
- S. Gregory
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - E. M. Bunnik
- Department of Medical Ethics and Philosophy of Medicine, Erasmus MC, University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - A. B. Callado
- BarcelonaBeta Brain Research Center, Pasqual Maragall Fundation, Barcelona, Spain
| | - I. Carrie
- Centre de Recherche Clinique du Gérontopôle, Toulouse University Hospital, Toulouse, France
| | - C. De Boer
- VUmc Alzheimercentrum, Amsterdam, The Netherlands
| | - J. Duffus
- Participant panel member, Barcelona, Spain
| | - K. Fauria
- BarcelonaBeta Brain Research Center, Pasqual Maragall Fundation, Barcelona, Spain
| | - S. Forster
- Department of Psychiatry, University of Oxford, Oxford, UK
| | - D. Gove
- Alzheimer Europe, Luxembourg, Luxembourg
| | - I. Knezevic
- BarcelonaBeta Brain Research Center, Pasqual Maragall Fundation, Barcelona, Spain
| | | | - D. Pennetier
- Centre de Recherche Clinique du Gérontopôle, Toulouse University Hospital, Toulouse, France
| | - S. Saunders
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - S. Sparks
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - J. Rice
- Participant panel member, Barcelona, Spain
| | - C. W. Ritchie
- Edinburgh Dementia Prevention, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - R. Milne
- Institute of Public Health, University of Cambridge, Cambridge, UK
- Society and Ethics Research, Wellcome Genome Campus, Hinxton, UK
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17
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Schürch CM, Roelli MA, Forster S, Wasmer MH, Brühl F, Maire RS, Di Pancrazio S, Ruepp MD, Giger R, Perren A, Schmitt AM, Krebs P, Charles RP, Dettmer MS. Targeting CD47 in Anaplastic Thyroid Carcinoma Enhances Tumor Phagocytosis by Macrophages and Is a Promising Therapeutic Strategy. Thyroid 2019; 29:979-992. [PMID: 30938231 PMCID: PMC6648226 DOI: 10.1089/thy.2018.0555] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Background: Anaplastic thyroid carcinoma (ATC) is one of the most aggressive human cancers, with a median survival of only three to six months. Standard treatment options and even targeted therapies have so far failed to improve long-term overall survival. Thus, novel treatment modalities for ATC, such as immunotherapy, are urgently needed. CD47 is a "don't eat me" signal, which prevents cancer cells from phagocytosis by binding to signal regulatory protein alpha on macrophages. So far, the role of macrophages and the CD47-signal regulatory protein alpha signaling axis in ATC is not well understood. Methods: This study analyzed 19 primary human ATCs for macrophage markers, CD47 expression, and immune checkpoints by immunohistochemistry. ATC cell lines and a fresh ATC sample were assessed by flow cytometry for CD47 expression and macrophage infiltration, respectively. CD47 was blocked in phagocytosis assays of co-cultured macrophages and ATC cell lines. Anti-CD47 antibody treatment was administered to ATC cell line xenotransplanted immunocompromised mice, as well as to tamoxifen-induced ATC double-transgenic mice. Results: Human ATC samples were heavily infiltrated by CD68- and CD163-expressing tumor-associated macrophages (TAMs), and expressed CD47 and calreticulin, the dominant pro-phagocytic molecule. In addition, ATC tissues expressed the immune checkpoint molecules programmed cell death 1 and programmed death ligand 1. Blocking CD47 promoted the phagocytosis of ATC cell lines by macrophages in vitro. Anti-CD47 antibody treatment of ATC xenotransplanted mice increased the frequency of TAMs, enhanced the expression of macrophage activation markers, augmented tumor cell phagocytosis, and suppressed tumor growth. In double-transgenic ATC mice, CD47 was expressed on tumor cells, and blocking CD47 increased TAM frequencies. Conclusions: Targeting CD47 or CD47 in combination with programmed cell death 1 may potentially improve the outcomes of ATC patients and may represent a valuable addition to the current standard of care.
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Affiliation(s)
- Christian M. Schürch
- Institute of Pathology, University of Bern, Bern, Switzerland
- Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California
- Address correspondence to: Christian M. Schürch, MD, PhD, Baxter Laboratory for Stem Cell Biology, Stanford University School of Medicine, 269 Campus Drive, CCSR 3220, Stanford, CA 94305
| | - Matthias A. Roelli
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Stefan Forster
- Institute of Pathology, University of Bern, Bern, Switzerland
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
- Department of BioMedical Research, University of Bern, Bern, Switzerland
| | - Marie-Hélène Wasmer
- Institute of Pathology, University of Bern, Bern, Switzerland
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Frido Brühl
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Renaud S. Maire
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Sergio Di Pancrazio
- Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Marc-David Ruepp
- Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
- United Kingdom Dementia Research Institute Centre, Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King's College London, London, United Kingdom
| | - Roland Giger
- Department of Oto-Rhino-Laryngology, Head and Neck Surgery, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland
| | - Aurel Perren
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Anja M. Schmitt
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Philippe Krebs
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Roch-Philippe Charles
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
| | - Matthias S. Dettmer
- Institute of Pathology, University of Bern, Bern, Switzerland
- Matthias S. Dettmer, MD, Institute of Pathology, University of Bern, Murtenstrasse 31, 3008 Bern, Switzerland
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18
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Schürch C, Roelli M, Wasmer M, Brühl F, Forster S, Maire R, Di Pancrazio S, Ruepp M, Perren A, Schmitt A, Krebs P, Charles R, Dettmer M. PO-171 The "don’t eat me" signal CD47 - a therapeutic option in human anaplastic thyroid carcinoma? Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30337-8] [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: 11/26/2022]
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19
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Lunn J, Sjoblom A, Ward J, Soto-Faraco S, Forster S. Multisensory enhancement of attention depends on whether you are already paying attention. Cognition 2019; 187:38-49. [PMID: 30825813 DOI: 10.1016/j.cognition.2019.02.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 02/12/2019] [Accepted: 02/13/2019] [Indexed: 10/27/2022]
Abstract
Multisensory stimuli are argued to capture attention more effectively than unisensory stimuli due to their ability to elicit a super-additive neuronal response. However, behavioural evidence for enhanced multisensory attentional capture is mixed. Furthermore, the notion of multisensory enhancement of attention conflicts with findings suggesting that multisensory integration may itself be dependent upon top-down attention. The present research resolves this discrepancy by examining how both endogenous attentional settings and the availability of attentional capacity modulate capture by multisensory stimuli. Across a series of four studies, two measures of attentional capture were used which vary in their reliance on endogenous attention: facilitation and distraction. Perceptual load was additionally manipulated to determine whether multisensory stimuli are still able to capture attention when attention is occupied by a demanding primary task. Multisensory stimuli presented as search targets were consistently detected faster than unisensory stimuli regardless of perceptual load, although they are nevertheless subject to load modulation. In contrast, task irrelevant multisensory stimuli did not cause greater distraction than unisensory stimuli, suggesting that the enhanced attentional status of multisensory stimuli may be mediated by the availability of endogenous attention. Implications for multisensory alerts in practical settings such as driving and aviation are discussed, namely that these may be advantageous during demanding tasks, but may be less suitable to signaling unexpected events.
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20
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Richter B, Sulzgruber P, Koller L, Steininger M, El-Hamid F, Rothgerber DJ, Forster S, Goliasch G, Silbert BI, Meyer EL, Hengstenberg C, Wojta J, Niessner A. Blood urea nitrogen has additive value beyond estimated glomerular filtration rate for prediction of long-term mortality in patients with acute myocardial infarction. Eur J Intern Med 2019; 59:84-90. [PMID: 30072202 DOI: 10.1016/j.ejim.2018.07.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 06/28/2018] [Accepted: 07/22/2018] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Blood urea nitrogen (BUN) has been shown to independently predict short- and intermediate-term outcomes in patients with acute myocardial infarction (AMI). We aimed to assess the additive predictive value of BUN beyond estimated glomerular filtration rate (eGFR) in AMI patients with an 8.6-year follow-up. METHODS This retrospective, observational single-centre study included 1332 consecutive AMI patients (median age 64 years, 58.4% male). BUN, creatinine and eGFR were determined at hospital admission. RESULTS During a median follow-up of 8.6 years (interquartile range [IQR] 4.0-11.6), 408 patients (30.6%) experienced the study endpoint of cardiovascular mortality. BUN (median 17.0 mg/dL [IQR 13.5-22.7]) was a significant predictor of cardiovascular mortality in univariate Cox regression (hazard ratio (HR) per 1 standard deviation increase 2.10, 95% confidence interval [CI] 1.94-2.28, p < .001). This association remained significant after multivariable adjustment for demographics, clinical variables and eGFR (adjusted HR 1.52 [CI 1.16-2.00, p = .003]). The association between BUN and outcome was more pronounced in patients with eGFR >60 mL/min/1.73m2 (HR 2.81 [CI 2.20-3.58, p < .001]). The discriminatory abilities (Harrell's C-statistic) for BUN, eGFR and creatinine were 0.75, 0.76 and 0.67, respectively. The addition of BUN to eGFR significantly improved the C-statistic (0.78, p for comparison = 0.017), net reclassification (23.7%, p < .001) and integrated discrimination (2.9%, p < .001). CONCLUSIONS Circulating BUN on admission is an independent predictor of long-term cardiovascular mortality in AMI patients and adds predictive power beyond eGFR. BUN reflects not only kidney function, but also acute haemodynamic and neurohumoral alterations during AMI, and may help to identify high-risk patients.
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Affiliation(s)
- Bernhard Richter
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Patrick Sulzgruber
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Lorenz Koller
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Matthias Steininger
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Feras El-Hamid
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - David J Rothgerber
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Stefan Forster
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Georg Goliasch
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Benjamin I Silbert
- Department of Intensive Care Medicine, Fiona Stanley Hospital, Murdoch, Australia
| | - Elias L Meyer
- Section for Medical Statistics, Center for Medical Statistics, Informatics, and Intelligent Systems, Medical University of Vienna, Austria
| | - Christian Hengstenberg
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Johann Wojta
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria
| | - Alexander Niessner
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Austria.
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21
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Schade H, Arneth N, Powilleit M, Forster S. Sand gapers' breath: Respiration of Mya arenaria (L. 1758) and its contribution to total oxygen utilization in sediments. Mar Environ Res 2019; 143:101-110. [PMID: 30477876 DOI: 10.1016/j.marenvres.2018.11.010] [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] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/15/2018] [Accepted: 11/15/2018] [Indexed: 06/09/2023]
Abstract
To estimate the contribution of a Mya arenaria population to total oxygen utilization (TOU) at different temperatures, the respiration rate of M. arenaria was measured for a full size range at 5 and 15 °C. In this study we measured respiration rates in a closed system while the clams were burrowed in sandy sediment, resembling their natural habitat. Rates were measured over a sufficient time span (24 h) to average varying activity phases during the measurements. We calculated a size-dependent respiration rate for M. arenaria and its variation with temperature. Temperature strongly affects the total population respiration and the contribution of different size classes to respiration of the total M. arenaria population. M. arenaria was estimated to contribute up to 70% to the total oxygen utilization of benthic communities analyzed in this study very much depending on the size distribution of the bivalve population present. Given a specific size distribution, smaller individuals had a stronger influence on the total oxygen utilization at colder temperature, while the influence of larger individuals grew with warmer temperature. Even though sizes contribute differently, a significant relation between abundance and respiration could be drawn in most cases analyzed. However, this relation should not be used as a general rule, but when estimating a population's metabolism the size distribution within that population has to be regarded.
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Affiliation(s)
- Hanna Schade
- Rostock University, Institute for Biological Sciences, Marine Biology, Albert-Einstein-Str. 3, D-18059, Rostock, Germany.
| | - Nikolas Arneth
- Rostock University, Institute for Biological Sciences, Marine Biology, Albert-Einstein-Str. 3, D-18059, Rostock, Germany
| | - Martin Powilleit
- Rostock University, Institute for Biological Sciences, Marine Biology, Albert-Einstein-Str. 3, D-18059, Rostock, Germany
| | - Stefan Forster
- Rostock University, Institute for Biological Sciences, Marine Biology, Albert-Einstein-Str. 3, D-18059, Rostock, Germany
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22
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Steininger M, Winter MP, Reiberger T, Koller L, El-Hamid F, Forster S, Schnaubelt S, Hengstenberg C, Distelmaier K, Goliasch G, Wojta J, Toma A, Niessner A, Sulzgruber P. De-Ritis Ratio Improves Long-Term Risk Prediction after Acute Myocardial Infarction. J Clin Med 2018; 7:jcm7120474. [PMID: 30477196 PMCID: PMC6306912 DOI: 10.3390/jcm7120474] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [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: 09/26/2018] [Revised: 10/28/2018] [Accepted: 11/14/2018] [Indexed: 12/17/2022] Open
Abstract
Background: Recent evidence suggested levels of aspartate aminotransferase (AST), alanine transaminase (ALT), and AST/ALT ratio (De-Ritis ratio) were associated with a worse outcome after acute myocardial infarction (AMI). However, their value for predicting long-term prognosis remained unknown. Therefore, we investigated the prognostic potential of transaminases on patient outcome after AMI from a long-term perspective. Methods: Data of a large AMI registry including 1355 consecutive patients were analyzed. The Cox regression hazard analysis was used to assess the impact of transaminases and the De-Ritis ratio on long-term mortality. Results: The median De-Ritis ratio for the entire study population was 1.5 (interquartile range [IQR]: 1.0–2.6). After a median follow-up time of 8.6 years, we found that AST (crude hazard ratio (HR) of 1.19 per 1-SD [95% confidence interval (CI): 1.09–1.32; p < 0.001]) and De-Ritis ratio (crude HR of 1.31 per 1-SD [95% CI: 1.18–1.44; p < 0.001]), but not ALT (p = 0.827), were significantly associated with long-term mortality after AMI. After adjustment for confounders independently, the De-Ritis ratio remained a strong and independent predictor for long-term mortality in the multivariate model with an adjusted HR of 1.23 per 1-SD (95% CI: 1.07–1.42; p = 0.004). Moreover, the De-Ritis ratio added prognostic value beyond N-terminal pro-B-Type Natriuretic Peptide, Troponin T, and Creatine Kinase. Conclusion: The De-Ritis ratio is a strong and independent predictor for long-term mortality after AMI. As a readily available biomarker in clinical routine, it might be used to identify patients at risk for fatal cardiovascular events and help to optimize secondary prevention strategies after AMI.
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Affiliation(s)
- Matthias Steininger
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Max-Paul Winter
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Thomas Reiberger
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, 1090 Vienna, Austria.
- Vienna Hepatic Hemodynamic Laboratory, Medical University of Vienna, 1090 Vienna, Austria.
| | - Lorenz Koller
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Feras El-Hamid
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Stefan Forster
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Sebastian Schnaubelt
- Department of Emergency Medicine, Medical University of Vienna, 1090 Vienna, Austria.
| | - Christian Hengstenberg
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Klaus Distelmaier
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Georg Goliasch
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Johann Wojta
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Aurel Toma
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Alexander Niessner
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
| | - Patrick Sulzgruber
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria.
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23
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Gebhardt C, Forster S. Size-selective feeding of Arenicola marina promotes long-term burial of microplastic particles in marine sediments. Environ Pollut 2018; 242:1777-1786. [PMID: 30076054 DOI: 10.1016/j.envpol.2018.07.090] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 07/19/2018] [Accepted: 07/20/2018] [Indexed: 06/08/2023]
Abstract
Despite of their ubiquitous distribution in marine sediments, the role of benthic fauna in microplastic transport at the sea floor has received little attention yet. The present study investigated the influence of bioturbation activity of the polychaete Arenicola marina on microplastic transport and burial in marine sediments. Sediment ingestion was assessed in a long term mesocosm experiment with exposure times ranging from 106 to 240 days, using three particle tracers with different particle diameters (microplastic: 500 and 1000 μm, respectively; luminophores: 130 μm). Sediment grain size distributions were assessed after experiment termination in all feeding layers at 8-12 cm depth to determine the influence of size-selective feeding of A. marina on median grain size and microplastic retention. Burial of microplastic occurred in all mesocosms up to a depth of 20 cm and was strongly dependent on individual sediment feeding rates. For low bioturbation conditions, both microplastic and luminophore concentrations exhibited an exponential decrease with increasing sediment depth, indicating particle burial via feeding funnel transport. Particle concentrations remained high in the uppermost 4 cm of the sediment. At high bioturbation rates, no microplastic particles remained in near-surface sediment layers, but a distinct accumulation of microplastic was observed in the feeding layer, suggesting the discrimination of plastic particles during feeding. In contrast, luminophores displayed a similar accumulation, but additionally showed uniform distributions above feeding layers, indicating ingestion and defecation by polychaetes. In accordance with these findings, an overall coarsening of median grain sizes was observed in all feeding layers, indicating the retention of large microplastic due to size-selective feeding. These findings demonstrate the ability of the conveyor belt-feeding polychaete A. marina to promote unidirectional transports of microplastic ≥500 μm and the potential for the long-term retention of these particles in marine sediments.
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Affiliation(s)
- Christopher Gebhardt
- University of Rostock, Institute of Biological Sciences, Marine Biology, Albert-Einstein-Strasse 3, 18059, Rostock, Germany.
| | - Stefan Forster
- University of Rostock, Institute of Biological Sciences, Marine Biology, Albert-Einstein-Strasse 3, 18059, Rostock, Germany.
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24
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Renz JR, Powilleit M, Gogina M, Zettler ML, Morys C, Forster S. Community bioirrigation potential (BIP c), an index to quantify the potential for solute exchange at the sediment-water interface. Mar Environ Res 2018; 141:214-224. [PMID: 30224085 DOI: 10.1016/j.marenvres.2018.09.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 07/19/2018] [Accepted: 09/09/2018] [Indexed: 05/24/2023]
Abstract
BIOIRRIGATION: the animal-induced exchange of solutes between pore water and overlying water - is a key process in sediments with profound implications for biogeochemical processes such as nutrient cycling and organic matter regeneration at the sediment water interface. There is an urgent need to understand how a changing environment will affect the irrigation activity of macrofauna and vice versa. A shift in species composition (e.g. from deep burrowing species to smaller, more opportunistic and shallow burrowing species) will have large effects on bioirrigation and thus on ecosystem function (such as benthic pelagic coupling). Considering the difficulties to determine area-covering rates of bioirrigation (e.g. in terms tracer-based fluxes) and the complexity of interactions of multiple species in the community that prohibit a direct measure of bioirrigation attributable to each species, a mechanistically-based approach is needed to predict relative intensities of bioirrigation activity based on the fundamental functional traits. We propose a conceptual framework to develop an index of bioirrigation that takes into account the biological mechanisms of bioirrigation and provides a simplified, yet functionally based approach to quantify the bioirrigation potential of benthic communities. We developed the community bioirrigation potential (BIPc) that provides a biomass- and abundance-weighted scoring system considering functional traits related to pore water and solute exchange. It may be used as a supplement to established methods to assess the function of marine soft sediments related bioirrigation. In analogy to the particle-related community bioturbation potential of Solan et al. (2004), context dependent organismal traits that affect ventilation and bioirrigation (feeding type, morphology of burrows, and burrowing depth) are combined with the data on abundance and biomass of the respective species. These are subsequently summed up to a community bioirrigation potential (BIPc). This review considers ecological traits relevant for bioirrigation and their classification into a bioirrigation index. Furthermore the necessary simplifications in the index (e.g. limiting its applicability to interfacial nutrient fluxes) are discussed. We also provide a working example from the southwestern Baltic Sea to illustrate the practical application of the index and a compilation of key species related to this area containing their classification into the considered bioirrigation traits.
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Affiliation(s)
- J R Renz
- University of Rostock, Institute of Biological Sciences, Marine Biology, Albert-Einstein-Straße 3, D-18059, Rostock, Germany.
| | - M Powilleit
- University of Rostock, Institute of Biological Sciences, Marine Biology, Albert-Einstein-Straße 3, D-18059, Rostock, Germany
| | - M Gogina
- Leibniz Institute for Baltic Sea Research Warnemünde, Seestrasse 15, D-18119, Rostock, Germany
| | - M L Zettler
- Leibniz Institute for Baltic Sea Research Warnemünde, Seestrasse 15, D-18119, Rostock, Germany
| | - C Morys
- Royal Netherlands Institute for Sea Research (NIOZ), Department of Estuarine and Delta Systems, and Utrecht University, Korringaweg 7, 4401, NT, Yerseke, Netherlands
| | - S Forster
- University of Rostock, Institute of Biological Sciences, Marine Biology, Albert-Einstein-Straße 3, D-18059, Rostock, Germany
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25
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Sulzgruber P, Koller L, Steininger M, El-Hamid F, Rothgerber DJ, Forster S, Distelmaier K, Goliasch G, Hengstenberg C, Wojta J, Niessner A. P1496Long-term prognosis of patients developing de-novo atrial fibrillation after acute myocardial infraction. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1496] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- P Sulzgruber
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - L Koller
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - M Steininger
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - F El-Hamid
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - D J Rothgerber
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - S Forster
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - K Distelmaier
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - G Goliasch
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - C Hengstenberg
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - J Wojta
- Medical University of Vienna, Cardiology, Vienna, Austria
| | - A Niessner
- Medical University of Vienna, Cardiology, Vienna, Austria
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26
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Morris J, Yeomans M, Forster S. A novel approach to measuring attentional bias for food using load theory: A preliminary investigation. Appetite 2018. [DOI: 10.1016/j.appet.2017.11.068] [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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27
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Schürch CM, Forster S, Brühl F, Yang SH, Felley-Bosco E, Hewer E. The "don't eat me" signal CD47 is a novel diagnostic biomarker and potential therapeutic target for diffuse malignant mesothelioma. Oncoimmunology 2017; 7:e1373235. [PMID: 29296529 PMCID: PMC5739575 DOI: 10.1080/2162402x.2017.1373235] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [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: 07/12/2017] [Revised: 08/24/2017] [Accepted: 08/25/2017] [Indexed: 12/29/2022] Open
Abstract
Diffuse malignant mesothelioma (DMM) is one of the prognostically most discouraging cancers with median survivals of only 12–22 months. Due to its insidious onset and delayed detection, DMM is often at an advanced stage at diagnosis and is considered incurable. Combined chemo- and radiotherapy followed by surgery only marginally affect outcome at the cost of significant morbidity. Because of the long time period between exposure to asbestos and disease onset, the incidence of DMM is still rising and predicted to peak around 2020. Novel markers for the reliable diagnosis of DMM in body cavity effusion specimens as well as more effective, targeted therapies are urgently needed. Here, we show that the “don't eat me” signalling molecule CD47, which inhibits phagocytosis by binding to signal regulatory protein α on macrophages, is overexpressed in DMM cells. A two-marker panel of high CD47 expression and BRCA1-associated protein 1 (BAP-1) deficiency had a sensitivity of 78% and specificity of 100% in discriminating DMM tumour cells from reactive mesothelial cells in effusions, which is superior to the currently used four-marker combination of BAP-1, glucose transporter type 1, epithelial membrane antigen and desmin. In addition, blocking CD47 inhibited growth and promoted phagocytosis of DMM cell lines by macrophages in vitro. Furthermore, DMM tumours in surgical specimens from patients as well as in a mouse DMM model expressed high levels of CD47 and were heavily infiltrated by macrophages. Our study demonstrates that CD47 is an accurate novel diagnostic DMM biomarker and that blocking CD47 may represent a promising therapeutic strategy for DMM.
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Affiliation(s)
| | - Stefan Forster
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Frido Brühl
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Sara H Yang
- Institute of Pathology, University of Bern, Bern, Switzerland
| | | | - Ekkehard Hewer
- Institute of Pathology, University of Bern, Bern, Switzerland
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Ivanovska J, Zlobec I, Forster S, Karamitopoulou E, Dawson H, Koelzer VH, Agaimy A, Garreis F, Söder S, Laqua W, Lugli A, Hartmann A, Rau TT, Schneider-Stock R. Correction: DAPK loss in colon cancer tumor buds: implications for migration capacity of disseminating tumor cells. Oncotarget 2017; 8:18615-18616. [PMID: 28407700 PMCID: PMC5392353 DOI: 10.18632/oncotarget.16154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
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Ivanovska J, Zlobec I, Forster S, Karamitopoulou E, Dawson H, Koelzer VH, Agaimy A, Garreis F, Söder S, Laqua W, Lugli A, Hartmann A, Rau TT, Schneider-Stock R. DAPK loss in colon cancer tumor buds: implications for migration capacity of disseminating tumor cells. Oncotarget 2017; 6:36774-88. [PMID: 26405175 PMCID: PMC4742210 DOI: 10.18632/oncotarget.4908] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 05/27/2015] [Accepted: 08/11/2015] [Indexed: 12/15/2022] Open
Abstract
Defining new therapeutic strategies to overcome therapy resistance due to tumor heterogeneity in colon cancer is challenging. One option is to explore the molecular profile of aggressive disseminating tumor cells. The cytoskeleton-associated Death-associated protein kinase (DAPK) is involved in the cross talk between tumor and immune cells at the invasion front of colorectal cancer. Here dedifferentiated tumor cells histologically defined as tumor budding are associated with a high risk of metastasis and poor prognosis. Analyzing samples from 144 colorectal cancer patients we investigated immunhistochemical DAPK expression in different tumor regions such as center, invasion front, and buds. Functional consequences for tumor aggressiveness were studied in a panel of colon tumor cell lines using different migration, wound healing, and invasion assays. DAPK levels were experimentally modified by siRNA transfection and overexpression as well as inhibitor treatments. We found that DAPK expression was reduced towards the invasion front and was nearly absent in tumor buds. Applying the ECIS system with HCT116 and HCT116 stable lentiviral DAPK knock down cells (HCTshDAPK) we identified an important role for DAPK in decreasing the migratory capacity whereas proliferation was not affected. Furthermore, the migration pattern differed with HCTshDAPK cells showing a cluster-like migration of tumor cell groups. DAPK inhibitor treatment revealed that the migration rate was independent of DAPK's catalytic activity. Modulation of DAPK expression level in SW480 and DLD1 colorectal cancer cells significantly influenced wound closure rate. DAPK seems to be a major player that influences the migratory capability of disseminating tumor cells and possibly affects the dynamic interface between pro- and anti-survival factors at the invasion front of colorectal cancer. This interesting and new finding requires further evaluation.
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Affiliation(s)
- Jelena Ivanovska
- Experimental Tumor Pathology, Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Inti Zlobec
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Stefan Forster
- Experimental Tumor Pathology, Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
| | | | - Heather Dawson
- Institute of Pathology, University of Bern, Bern, Switzerland
| | | | - Abbas Agaimy
- Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Fabian Garreis
- Department of Anatomy, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Stephan Söder
- Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - William Laqua
- Experimental Tumor Pathology, Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
| | | | - Arndt Hartmann
- Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Tilman T Rau
- Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany.,Institute of Pathology, University of Bern, Bern, Switzerland
| | - Regine Schneider-Stock
- Experimental Tumor Pathology, Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany.,Institute of Pathology, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), Erlangen, Germany
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Sulzgruber P, El-Hamid F, Koller L, Forster S, Goliasch G, Wojta J, Niessner A. Long-term outcome and risk prediction in patients suffering acute myocardial infarction complicated by post-infarction cardiac rupture. Int J Cardiol 2017; 227:399-403. [DOI: 10.1016/j.ijcard.2016.11.037] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Revised: 08/12/2016] [Accepted: 11/05/2016] [Indexed: 12/12/2022]
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Forster S, Lowrey G, Smith S. P205 Improving long term oxygen prescribing at hospital discharge: a before and after study. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.348] [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: 11/03/2022]
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Forster S, Housley G, Hatton J, Shaw D. P194 Early warning scores, too imprecise a tool in patients with respiratory disease? Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.337] [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: 11/03/2022]
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Sulzgruber P, Koller L, Pavo N, El-Hamid F, Rothgerber DJ, Forster S, Maurer G, Goliasch G, Niessner A. Gender-related differences in elderly patients with myocardial infarction in a European Centre. Eur J Clin Invest 2016; 46:60-9. [PMID: 26575703 DOI: 10.1111/eci.12567] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 11/07/2015] [Indexed: 12/24/2022]
Abstract
BACKGROUND Weighing the benefit of revascularization procedures against the risk of adverse events is particularly challenging in elderly patients suffering acute myocardial infarction (AMI). Based on a general gender gap in coronary interventions, the restraint in invasive procedures may be particularly high in elderly women. We therefore investigated gender-related differences in the frequency of coronary interventions as well as gender- and age-specific outcomes after coronary interventions in patients with AMI. DESIGN We included 906 AMI patients in the final analysis. Among patients ≥ 80 years (n = 453), the intention to intervention (lysis and/or coronary angiography) for women was significantly lower compared to men (65·7% vs. 80·8%; P < 0·001), whereas in patients < 80 years (n = 453), the rate was similar between both genders (94·8% vs. 95·1%, P = 0·89). However, the assessment of potential risk factors for adverse events did not explain the gender gap. When assessing the benefit of any coronary intervention (stenting and/or lysis and/or coronary artery bypass graft), elderly women benefited at least as much with a hazard ratio (HR) for cardiovascular mortality of 0·56 (95% confidence interval [CI] 0·37-0·84, P = 0·005) compared to a HR of 0·96 (95% CI 0·76-1·23, P = 0·766) in elderly men. CONCLUSION We observed a lower intention to coronary intervention in elderly women compared with men. However, the distribution of risk factors in elderly women and men who did not undergo coronary intervention was similar and therefore seemed not to be causal for the gender gap although the benefit of any coronary interventions was even higher in elderly women.
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Affiliation(s)
- Patrick Sulzgruber
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Lorenz Koller
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Noemi Pavo
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Feras El-Hamid
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - David-Jonas Rothgerber
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Stefan Forster
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Gerald Maurer
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Georg Goliasch
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Alexander Niessner
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
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Bhunia S, Forster S, Vyas N, Schmitt HC, Ojha AK. Direct visual evidence of end-on adsorption geometry of pyridine on silver surface investigated by surface enhanced Raman scattering and density functional theory calculations. Spectrochim Acta A Mol Biomol Spectrosc 2015; 151:888-894. [PMID: 26184474 DOI: 10.1016/j.saa.2015.07.019] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 07/01/2015] [Accepted: 07/03/2015] [Indexed: 06/04/2023]
Abstract
Fourier transform Raman (FT-Raman) spectra of neat pyridine (Py) and surface enhanced Raman scattering (SERS) spectra of Py with silver nanoparticles (AgNPs) solution at different molar concentrations (X=1.5M, 1.0M, 0.50 M, 0.25 M, and 0.125 M) were recorded using 1064 nm excitation wavelength. The intensity of Raman bands at ∼1003 (ν11) and ∼1035 (ν21) cm(-1) of Py is enhanced in the SERS spectra. Two new Raman bands were observed at ∼1009 (ν12) and ∼1038 (ν22) cm(-1) in the SERS spectra. These bands correspond to the ring breathing vibrations of Py molecules adsorbed at the AgNPs surface. The value of intensity ratios (I12/I11) and (I21/I22) is increased with dilution and attains a maximum value at X=0.5M and upon further dilution (0.25 and 0.125 M) it drops gradually. The theoretically calculated Raman spectra were found to be in good agreement with experimentally observed Raman spectra. Both, experimental and theoretical investigations have confirmed that the Py interacts with AgNPs via the end-on geometry.
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Affiliation(s)
- Snehasis Bhunia
- Department of Physics, Motilal Nehru National Institute of Technology, Allahabad 211004, India
| | - Stefan Forster
- Institute of Physical and Theoretical Chemistry, University of Wuerzburg, Am Hubland, D-97074 Wuerzburg, Germany
| | - Nidhi Vyas
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Hans-Christian Schmitt
- Institute of Physical and Theoretical Chemistry, University of Wuerzburg, Am Hubland, D-97074 Wuerzburg, Germany
| | - Animesh K Ojha
- Department of Physics, Motilal Nehru National Institute of Technology, Allahabad 211004, India.
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Stolte A, Forster S, Gerdts G, Schubert H. Microplastic concentrations in beach sediments along the German Baltic coast. Marine Pollution Bulletin 2015; 99:216-229. [PMID: 26198261 DOI: 10.1016/j.marpolbul.2015.07.022] [Citation(s) in RCA: 229] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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Ossenkoppele R, Jansen WJ, Rabinovici GD, Knol DL, van der Flier WM, van Berckel BNM, Scheltens P, Visser PJ, Verfaillie SCJ, Zwan MD, Adriaanse SM, Lammertsma AA, Barkhof F, Jagust WJ, Miller BL, Rosen HJ, Landau SM, Villemagne VL, Rowe CC, Lee DY, Na DL, Seo SW, Sarazin M, Roe CM, Sabri O, Barthel H, Koglin N, Hodges J, Leyton CE, Vandenberghe R, van Laere K, Drzezga A, Forster S, Grimmer T, Sánchez-Juan P, Carril JM, Mok V, Camus V, Klunk WE, Cohen AD, Meyer PT, Hellwig S, Newberg A, Frederiksen KS, Fleisher AS, Mintun MA, Wolk DA, Nordberg A, Rinne JO, Chételat G, Lleo A, Blesa R, Fortea J, Madsen K, Rodrigue KM, Brooks DJ. Prevalence of amyloid PET positivity in dementia syndromes: a meta-analysis. JAMA 2015; 313:1939-49. [PMID: 25988463 PMCID: PMC4517678 DOI: 10.1001/jama.2015.4669] [Citation(s) in RCA: 428] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
IMPORTANCE Amyloid-β positron emission tomography (PET) imaging allows in vivo detection of fibrillar plaques, a core neuropathological feature of Alzheimer disease (AD). Its diagnostic utility is still unclear because amyloid plaques also occur in patients with non-AD dementia. OBJECTIVE To use individual participant data meta-analysis to estimate the prevalence of amyloid positivity on PET in a wide variety of dementia syndromes. DATA SOURCES The MEDLINE and Web of Science databases were searched from January 2004 to April 2015 for amyloid PET studies. STUDY SELECTION Case reports and studies on neurological or psychiatric diseases other than dementia were excluded. Corresponding authors of eligible cohorts were invited to provide individual participant data. DATA EXTRACTION AND SYNTHESIS Data were provided for 1359 participants with clinically diagnosed AD and 538 participants with non-AD dementia. The reference groups were 1849 healthy control participants (based on amyloid PET) and an independent sample of 1369 AD participants (based on autopsy). MAIN OUTCOMES AND MEASURES Estimated prevalence of positive amyloid PET scans according to diagnosis, age, and apolipoprotein E (APOE) ε4 status, using the generalized estimating equations method. RESULTS The likelihood of amyloid positivity was associated with age and APOE ε4 status. In AD dementia, the prevalence of amyloid positivity decreased from age 50 to 90 years in APOE ε4 noncarriers (86% [95% CI, 73%-94%] at 50 years to 68% [95% CI, 57%-77%] at 90 years; n = 377) and to a lesser degree in APOE ε4 carriers (97% [95% CI, 92%-99%] at 50 years to 90% [95% CI, 83%-94%] at 90 years; n = 593; P < .01). Similar associations of age and APOE ε4 with amyloid positivity were observed in participants with AD dementia at autopsy. In most non-AD dementias, amyloid positivity increased with both age (from 60 to 80 years) and APOE ε4 carriership (dementia with Lewy bodies: carriers [n = 16], 63% [95% CI, 48%-80%] at 60 years to 83% [95% CI, 67%-92%] at 80 years; noncarriers [n = 18], 29% [95% CI, 15%-50%] at 60 years to 54% [95% CI, 30%-77%] at 80 years; frontotemporal dementia: carriers [n = 48], 19% [95% CI, 12%-28%] at 60 years to 43% [95% CI, 35%-50%] at 80 years; noncarriers [n = 160], 5% [95% CI, 3%-8%] at 60 years to 14% [95% CI, 11%-18%] at 80 years; vascular dementia: carriers [n = 30], 25% [95% CI, 9%-52%] at 60 years to 64% [95% CI, 49%-77%] at 80 years; noncarriers [n = 77], 7% [95% CI, 3%-18%] at 60 years to 29% [95% CI, 17%-43%] at 80 years. CONCLUSIONS AND RELEVANCE Among participants with dementia, the prevalence of amyloid positivity was associated with clinical diagnosis, age, and APOE genotype. These findings indicate the potential clinical utility of amyloid imaging for differential diagnosis in early-onset dementia and to support the clinical diagnosis of participants with AD dementia and noncarrier APOE ε4 status who are older than 70 years.
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Affiliation(s)
- Rik Ossenkoppele
- Department of Neurology and Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands 2Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands 3Memory and Aging Center, University of Californ
| | - Willemijn J Jansen
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Alzheimer Center Limburg, Maastricht University, the Netherlands
| | - Gil D Rabinovici
- Memory and Aging Center, University of California, San Francisco4Helen Wills Neuroscience Institute, University of California, Berkeley
| | - Dirk L Knol
- Department of Epidemiology and Biostatistics, VU University Medical Center, Amsterdam, the Netherlands
| | - Wiesje M van der Flier
- Department of Neurology and Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands 6Department of Epidemiology and Biostatistics, VU University Medical Center, Amsterdam, the Netherlands
| | - Bart N M van Berckel
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - Philip Scheltens
- Department of Neurology and Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands
| | - Pieter Jelle Visser
- Department of Neurology and Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands 5Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Alzheimer Center Limburg, Maastricht University, the Netherlan
| | | | - Sander C J Verfaillie
- Department of Neurology and Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands 2Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - Marissa D Zwan
- Department of Neurology and Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands 2Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - Sofie M Adriaanse
- Department of Neurology and Alzheimer Center, VU University Medical Center, Amsterdam, the Netherlands 2Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - Adriaan A Lammertsma
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - Frederik Barkhof
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - William J Jagust
- Helen Wills Neuroscience Institute, University of California, Berkeley7Lawrence Berkeley National Laboratory, University of California, Berkeley
| | - Bruce L Miller
- Memory and Aging Center, University of California, San Francisco
| | - Howard J Rosen
- Memory and Aging Center, University of California, San Francisco
| | - Susan M Landau
- Helen Wills Neuroscience Institute, University of California, Berkeley7Lawrence Berkeley National Laboratory, University of California, Berkeley
| | - Victor L Villemagne
- Department of Nuclear Medicine and Centre for PET, Austin Health, Melbourne, Australia
| | - Christopher C Rowe
- Department of Nuclear Medicine and Centre for PET, Austin Health, Melbourne, Australia
| | - Dong Y Lee
- Department of Neuropsychiatry, College of Medicine, Seoul National University, South Korea
| | - Duk L Na
- Department of Neurology, Sungkyunkwan University, Seoul, South Korea
| | - Sang W Seo
- Department of Neurology, Sungkyunkwan University, Seoul, South Korea
| | - Marie Sarazin
- Neurologie de la Mémoire et du Langage, Sorbonne Paris Cité, INSERM UMR S894, Centre Hospitalier Sainte Anne, Université Paris Descartes, France
| | - Catherine M Roe
- Department of Neurology, Knight Alzheimer Disease Research Center, Washington University School of Medicine, St Louis, Missouri
| | - Osama Sabri
- Department of Nuclear Medicine, University of Leipzig, Germany
| | - Henryk Barthel
- Department of Nuclear Medicine, University of Leipzig, Germany
| | | | - John Hodges
- Neuroscience Research Australia, Sydney, Australia
| | | | - Rik Vandenberghe
- Laboratory for Cognitive Neurology and Alzheimer Research Center, Katholieke Universiteit Leuven, Catholic University Leuven, Belgium
| | - Koen van Laere
- Laboratory for Cognitive Neurology and Alzheimer Research Center, Katholieke Universiteit Leuven, Catholic University Leuven, Belgium
| | | | - Stefan Forster
- Department of Nuclear Medicine, Technische Universitaet Muenchen, Munich, Germany
| | - Timo Grimmer
- Department of Psychiatry and Psychotherapy, Klinikum rechts der Isar der Technische Universitaet Muenchen, Munich, Germany
| | - Pascual Sánchez-Juan
- IFIMAV and Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Marqués de Valdecilla University Hospital, Cantabria, Spain
| | - Jose M Carril
- Department of Nuclear Medicine, Marqués de Valdecilla University Hospital, University of Cantabria, Spain
| | - Vincent Mok
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Shatin, China
| | - Vincent Camus
- INSERM U930 and Université François Rabelais de Tours, Centre Hospitalier Régional Universitaire Hôpitaux de Tours, France
| | - William E Klunk
- Alzheimer's Disease Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Ann D Cohen
- Alzheimer's Disease Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Philipp T Meyer
- Department of Nuclear Medicine, University Hospital Freiburg, Germany
| | - Sabine Hellwig
- Centre for Geriatrics and Gerontology, University Hospital Freiburg, Germany
| | - Andrew Newberg
- Myrna Brind Center of Integrative Medicine, Thomas Jefferson University and Hospital, Philadelphia, Pennsylvania
| | - Kristian S Frederiksen
- Danish Dementia Research Center, Department of Neurology, Righospitalet, University of Copenhagen, Denmark
| | | | - Mark A Mintun
- Avid Radiopharmaceuticals, Philadelphia, Pennsylvania
| | - David A Wolk
- Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Agneta Nordberg
- Center for Alzheimer Research, Translational Alzheimer Neurobiology, Karolinska Institutet, Stockholm, Sweden
| | - Juha O Rinne
- Turku PET Centre and Division of Clinical Neuroscience, Turku University Hospital, University of Turku, Finland
| | - Gaël Chételat
- Institut National de la Santé et de la Recherche Medicale, Caen, France
| | - Alberto Lleo
- Department of Neurology, Universitat Autònoma de Barcelona, Spain
| | - Rafael Blesa
- Department of Neurology, Universitat Autònoma de Barcelona, Spain
| | - Juan Fortea
- Department of Neurology, Universitat Autònoma de Barcelona, Spain
| | - Karine Madsen
- Neurobiology Research Unit, Copenhagen University Hospital, Denmark, Germany
| | | | - David J Brooks
- University of Texas Southwestern Medical Center, Dallas39Division of Neuroscience and Medical Research Council Clinical Sciences Centre, Imperial College London, United Kingdom
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Sulzgruber P, Koller L, Reiberger T, El-Hamid F, Forster S, Rothgerber DJ, Goliasch G, Wojta J, Niessner A. Butyrylcholinesterase predicts cardiac mortality in young patients with acute coronary syndrome. PLoS One 2015; 10:e0123948. [PMID: 25933219 PMCID: PMC4416767 DOI: 10.1371/journal.pone.0123948] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Accepted: 03/09/2015] [Indexed: 12/31/2022] Open
Abstract
Background The incidence of acute coronary syndrome (ACS) in young people (≤65 years) is continuously rising. While prognostic factors in ACS are well-investigated less attention has been paid to their age-dependent prognostic value and their particular relevance in younger patients. The aim of our study was to assess the age-dependent prognostic impact of butyrylcholinesterase (BChE). Methods Retrospective cohort study including 624 patients with ACS. Patients were stratified by age into equal groups (n = 208) corresponding to “young patients” (45–64 years), "middle-aged patients” (65–84 years) and “old patients” (85–100 years). Cox regression hazard analysis was used to assess the influence of BChE on survival. Results After a mean follow-up time of 4.0 (interquartile range [IQR] 2.0–6.4) years, 154 patients (24.7%) died due to a cardiac cause. In the overall cohort, BChE was indirectly associated with cardiac mortality-free survival (adjusted hazard ratio (HR): 0.70 (95% confidence interval [CI] 0.53–0.93, p = 0.01). The primary-analysis of BChE by age strata showed the strongest effect in the age group 45–64 years with an adjusted HR per 1-SD of 0.28 (95% CI 0.12–0.64, p = 0.003), a weaker association with mortality in middle aged (65–84 years: adjusted HR per 1-SD 0.66 [95% CI: 0.41–1.06], p = 0.087), and no association in older patients (85–100 years: adjusted HR per 1-SD 0.89 [95% CI: 0.58–1.38], p = 0.613). Conclusion BChE is a strong predictor for cardiac mortality specifically in younger patients with ACS aged between 45 and 64 years. No significant association of BChE with cardiac-mortality was detected in other age classes.
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Affiliation(s)
- Patrick Sulzgruber
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Lorenz Koller
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Thomas Reiberger
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
- Edwin L. Steele Laboratory, Dept. of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Feras El-Hamid
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Stefan Forster
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - David-Jonas Rothgerber
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Georg Goliasch
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Johann Wojta
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
| | - Alexander Niessner
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
- * E-mail:
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Forster S, Iacono T. The nature of affect attunement used by disability support workers interacting with adults with profound intellectual and multiple disabilities. J Intellect Disabil Res 2014; 58:1105-1120. [PMID: 24266858 DOI: 10.1111/jir.12103] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [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: 11/01/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND The interactions experienced by adults with profound intellectual and multiple disabilities (PIMD) with their disability support workers (DSWs) may have a large impact on life quality. However, defining good-quality interaction has presented challenges for this group. It has been suggested that in typically developing infant-mother dyads, the presence of affect attunement may be an indicator of quality. Affect attunement refers to the recasting of one person's affect by another with emphasis. METHOD The presence and nature of affect attunement in interactions between 21 pairs of adults with PIMD and their DSWs were explored in this study. Natural interactions were videorecorded for 21 pairs of adults with PIMD and their DSWs. The recordings were analysed for the presence and nature of affect attunement incidents, and analysed using descriptive statistics. RESULTS Affect attunement incidents were observed in 16 of the pairs. The DSW's attunement behaviour was in response to subtle, short duration behaviours of participants with PIMD. CONCLUSION These brief moments of connection may be a basis of good-quality interaction.
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Affiliation(s)
- S Forster
- Centre for Developmental Disability Health Victoria, Monash University, Notting Hill, Vic., Australia
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Forster S, Lavie N. Establishing the Attention-Deficit Trait. J Vis 2014. [DOI: 10.1167/14.10.542] [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: 11/24/2022] Open
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Ojha AK, Forster S, Kumar S, Vats S, Negi S, Fischer I. Synthesis of well-dispersed silver nanorods of different aspect ratios and their antimicrobial properties against Gram positive and negative bacterial strains. J Nanobiotechnology 2013; 11:42. [PMID: 24358993 PMCID: PMC3879323 DOI: 10.1186/1477-3155-11-42] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [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: 10/08/2013] [Accepted: 11/18/2013] [Indexed: 12/16/2022] Open
Abstract
In the present contribution, we describe the synthesis of highly dispersed silver nanorods (NRs) of different aspect ratios using a chemical route. The shape and size of the synthesized NRs were characterized by Transmission Electron Microscopy (TEM) and UV-visible spectroscopy. Longitudinal and transverse absorptions bands confirm the rod type structure. The experimentally recorded UV-visible spectra of NRs solutions were fitted by using an expression of the extinction coefficient for rod like nano structures under the dipole approximation. Simulated and experimentally observed UV-visible spectra were compared to determine the aspect ratios (R) of NRs. The average values of R for NR1, NR2 and NR3 solutions are estimated to be 3.0 ± 0.1, 1.8 ± 0.1 and 1.2 ± 0.1, respectively. These values are in good agreement with those obtained by TEM micrographs. The silver NRs of known aspect ratios are used to study antimicrobial activities against B. subtilis (gram positive) and E. coli (gram negative) microbes. We observed that the NRs of intermediate aspect ratio (R = 1.8) have greater antimicrobial effect against both, B. subtilis (gram positive) and E. coli (gram negative). The NRs of aspect ratio, R = 3.0 has better antimicrobial activities against gram positive than on the gram negative.
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Affiliation(s)
- Animesh K Ojha
- Motilal Nehru National Institute of Technology Allahabad, Allahabd 211004, India.
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Klupp E, Grimmer T, Yousefi B, Wester H, Yakushev I, Förstl H, Drzezga A, Forster S. O3–08–04: Prefrontal hypometabolism in Alzheimer's disease is caused by longitudinal amyloid accumulation in remote, functionally connected brain regions. Alzheimers Dement 2013. [DOI: 10.1016/j.jalz.2013.04.282] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | - Hans Förstl
- Technische Universität Munich Munich Germany
| | | | - Stefan Forster
- Department of Nuclear Medicine Technische Universität Munich Munich Germany
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Goliasch G, Forster S, El-Hamid F, Sulzgruber P, Meyer N, Siostrzonek P, Maurer G, Niessner A. Platelet count predicts cardiovascular mortality in very elderly patients with myocardial infarction. Eur J Clin Invest 2013; 43:332-40. [PMID: 23398046 DOI: 10.1111/eci.12049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [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: 10/09/2012] [Accepted: 12/26/2012] [Indexed: 01/22/2023]
Abstract
BACKGROUND The prognosis of elderly patients with acute myocardial infarction (AMI) is poor, and information on specific risk factors remains scarce. The aim of our study was to assess the influence of platelet count on cardiovascular mortality in very elderly patients with acute myocardial infarction (≥ 85 years of age). METHODS We identified 208 elderly AMI patients and compared the platelet count with 208 matched young AMI patients (≤ 65 years) and 208 matched intermediate age AMI patients (66-84 years) who derived from the same cohort. RESULTS During a median follow-up of 4·7 years, 25% of patients (n = 156) died of cardiovascular causes (97 very elderly, 46 intermediate age and 13 young age patients). We detected a mean platelet count of 227G/l (SD ± 83) in very elderly AMI patients, of 236G/l (SD ± 78) in the intermediate AMI group and of 254G/l (SD ± 79) in 208 young AMI patients (ANOVA P = 0·002). We revealed a significant interaction between age and platelet count with regard to cardiovascular mortality (p for interaction = 0·014). Platelet count displayed a significant risk transformation from an independent risk factor for cardiovascular mortality in very elderly AMI patients (adj. hazard ratio (HR) per 1-SD increase 1·25;95%CI 1·02-1·54;P = 0·028), via displaying no association with mortality in the intermediate age group (P = 0·10), to a strong inverse association in young patients (adj. HR 0·36;95%CI 0·18-0·68;P = 0·002). CONCLUSION Our study demonstrates an independent association between elevated platelet count and long-term cardiovascular mortality in the growing and vulnerable group of very elderly AMI patients. Nevertheless, the pathophysiologic mechanisms underlying this age-dependent effect have to be further clarified.
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Affiliation(s)
- Georg Goliasch
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria
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Grimmer T, Wutz C, Drzezga A, Forster S, Forstl H, Ortner M, Perneczky R, Kurz A. The Usefulness of Amyloid Imaging in Predicting the Clinical Outcome After Two Years in Subjects with Mild Cognitive Impairment. Curr Alzheimer Res 2013. [DOI: 10.2174/156720513804871499] [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: 11/22/2022]
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Grimmer T, Wutz C, Drzezga A, Forster S, Forstl H, Ortner M, Perneczky R, Kurz A. The Usefulness of Amyloid Imaging in Predicting the Clinical Outcome After Two Years in Subjects with Mild Cognitive Impairment. Curr Alzheimer Res 2013. [DOI: 10.2174/1567205011310010011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Perrin AJ, Gunda M, Yu B, Yen K, Ito S, Forster S, Tissenbaum HA, Derry WB. Noncanonical control of C. elegans germline apoptosis by the insulin/IGF-1 and Ras/MAPK signaling pathways. Cell Death Differ 2012; 20:97-107. [PMID: 22935616 DOI: 10.1038/cdd.2012.101] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The insulin/IGF-1 pathway controls a number of physiological processes in the nematode worm Caenorhabditis elegans, including development, aging and stress response. We previously found that the Akt/PKB ortholog AKT-1 dampens the apoptotic response to genotoxic stress in the germline by negatively regulating the p53-like transcription factor CEP-1. Here, we report unexpected rearrangements to the insulin/IGF-1 pathway, whereby the insulin-like receptor DAF-2 and 3-phosphoinositide-dependent protein kinase PDK-1 oppose AKT-1 to promote DNA damage-induced apoptosis. While DNA damage does not affect phosphorylation at the PDK-1 site Thr350/Thr308 of AKT-1, it increased phosphorylation at Ser517/Ser473. Although ablation of daf-2 or pdk-1 completely suppressed akt-1-dependent apoptosis, the transcriptional activation of CEP-1 was unaffected, suggesting that daf-2 and pdk-1 act independently or downstream of cep-1 and akt-1. Ablation of the akt-1 paralog akt-2 or the downstream target of the insulin/IGF-1 pathway daf-16 (a FOXO transcription factor) restored sensitivity to damage-induced apoptosis in daf-2 and pdk-1 mutants. In addition, daf-2 and pdk-1 mutants have reduced levels of phospho-MPK-1/ERK in their germ cells, indicating that the insulin/IGF-1 pathway promotes Ras signaling in the germline. Ablation of the Ras effector gla-3, a negative regulator of mpk-1, restored sensitivity to apoptosis in daf-2 mutants, suggesting that gla-3 acts downstream of daf-2. In addition, the hypersensitivity of let-60/Ras gain-of-function mutants to damage-induced apoptosis was suppressed to wild-type levels by ablation of daf-2. Thus, insulin/IGF-1 signaling selectively engages AKT-2/DAF-16 to promote DNA damage-induced germ cell apoptosis downstream of CEP-1 through the Ras pathway.
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Affiliation(s)
- A J Perrin
- Developmental and Stem Cell Biology Program, The Hospital for Sick Children, Toronto, Ontario M5G 1L7, Canada
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Forster S, McArthur SL. Stable low-fouling plasma polymer coatings on polydimethylsiloxane. Biomicrofluidics 2012; 6:36504. [PMID: 24062864 PMCID: PMC3470602 DOI: 10.1063/1.4754600] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 09/10/2012] [Indexed: 05/15/2023]
Abstract
Polydimethylsiloxane (DMS) is a popular material for microfluidics, but it is hydrophobic and is prone to non-specific protein adsorption. In this study, we explore methods for producing stable, protein resistant, tetraglyme plasma polymer coatings on PDMS by combining extended baking processes with multiple plasma polymer coating steps. We demonstrate that by using this approach, it is possible to produce a plasma polymer coatings that resist protein adsorption (<10 ng/cm(2)) and are stable to storage over at least 100 days. This methodology can translate to any plasma polymer system, enabling the introduction of a wide range of surface functionalities on PDMS surfaces.
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Affiliation(s)
- S Forster
- Department of Engineering Materials, Kroto Research Institute, University of Sheffield, Sheffield Biotactical Engineering Group, IRIS, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn 3122, Australia
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Forster S, Gray KM, Taffe J, Einfeld SL, Tonge BJ. Behavioural and emotional problems in people with severe and profound intellectual disability. J Intellect Disabil Res 2011; 55:190-198. [PMID: 21199050 DOI: 10.1111/j.1365-2788.2010.01373.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND People with severe and profound levels of intellectual disability (ID) are frequently examined as a single group in research. However, these two groups may be significantly different, particularly in the area of emotional and behavioural difficulties. METHOD The Developmental Behaviour Checklist (DBC) was completed by parents and caregivers of 107 people with severe ID and 22 people with profound ID at four time periods across 12 years. Regression analyses were used to examine trends in sub-scale scores across time and groups. RESULTS Significant differences between the groups of people with severe and profound ID were found. People with profound ID had significantly lower scores across all sub-scales except Social Relating. This was usually related to fewer items being selected as present for people with profound ID, as opposed to the scores being attributable to lower item severity scores. CONCLUSIONS There are significant differences between groups of people with severe and profound ID in scores on the DBC, indicating differences in behavioural and emotional problems. Caution should be exercised by researchers treating these two disparate groups as a single group, and by practitioners translating such findings into practice.
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Affiliation(s)
- S Forster
- Centre for Developmental Psychiatry and Psychology, School of Psychology and Psychiatry, Monash University, Melbourne, Australia.
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Jaeger T, Forster S, Aufenanger J, Moore D, Rassweiler J, Alken P. Aktivität der Glutathion-Peroxidase beim humanen Harnblasenkarzinom. Aktuelle Urol 2008. [DOI: 10.1055/s-2008-1057866] [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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Maurer B, Forster S. [Killing of cattle via electrical stunning]. Dtsch Tierarztl Wochenschr 2007; 114:136-9. [PMID: 17484500] [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: 05/15/2023]
Abstract
For disease control in the case of epidemics killing of cattle via electrical stunning is a method of choice. The official veterinarian is responsible for monitoring the adhesion to animal welfare principles during electrical stunning and killing. This requires specialised knowledge and experience as the symptoms of effective stunning are quite variable in cattle. Signs of effective and ineffective stunning are described below. In addition to suitable technical equipment, restraint of the animals and correct use of the equipment, neurophysiological processes have to be considered. Calm handling of the animals avoiding stress is a prerequisite for ensuring animal welfare and minimising pain especially when killing cattle using electrical methods.
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Affiliation(s)
- B Maurer
- Bayer. Landesamt für Gesundheit und Lebensmittelsicherheit.
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Wurst FM, Wiesbeck G, Forster S, Bechtel G, Wolfersdorf M, Huber P, Alexson S, Gilg T, Jachau K, Varga A, Alling C, Skipper G, Pragst F, Auwìrter A, Weinmann W. Further significance for the diagnostic and therapeutic usefulness of the non oxidative direct ethanol metabolites ethyl glucuronide (EtG), fatty acid ethyl esters (FAEEs) and phosphatidyl ethanol (PEth) in comparison to traditional markers. Pharmacopsychiatry 2004. [DOI: 10.1055/s-2003-825569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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