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Handl V, Waldherr L, Arbring Sjöström T, Abrahamsson T, Seitanidou M, Erschen S, Gorischek A, Bernacka-Wojcik I, Saarela H, Tomin T, Honeder SE, Distl J, Huber W, Asslaber M, Birner-Grünberger R, Schäfer U, Berggren M, Schindl R, Patz S, Simon DT, Ghaffari-Tabrizi-Wizsy N. Continuous iontronic chemotherapy reduces brain tumor growth in embryonic avian in vivo models. J Control Release 2024; 369:668-683. [PMID: 38548064 DOI: 10.1016/j.jconrel.2024.03.044] [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: 11/15/2023] [Revised: 03/21/2024] [Accepted: 03/25/2024] [Indexed: 04/14/2024]
Abstract
Local and long-lasting administration of potent chemotherapeutics is a promising therapeutic intervention to increase the efficiency of chemotherapy of hard-to-treat tumors such as the most lethal brain tumors, glioblastomas (GBM). However, despite high toxicity for GBM cells, potent chemotherapeutics such as gemcitabine (Gem) cannot be widely implemented as they do not efficiently cross the blood brain barrier (BBB). As an alternative method for continuous administration of Gem, we here operate freestanding iontronic pumps - "GemIPs" - equipped with a custom-synthesized ion exchange membrane (IEM) to treat a GBM tumor in an avian embryonic in vivo system. We compare GemIP treatment effects with a topical metronomic treatment and observe that a remarkable growth inhibition was only achieved with steady dosing via GemIPs. Daily topical drug administration (at the maximum dosage that was not lethal for the embryonic host organism) did not decrease tumor sizes, while both treatment regimes caused S-phase cell cycle arrest and apoptosis. We hypothesize that the pharmacodynamic effects generate different intratumoral drug concentration profiles for each technique, which causes this difference in outcome. We created a digital model of the experiment, which proposes a fast decay in the local drug concentration for the topical daily treatment, but a long-lasting high local concentration of Gem close to the tumor area with GemIPs. Continuous chemotherapy with iontronic devices opens new possibilities in cancer treatment: the long-lasting and highly local dosing of clinically available, potent chemotherapeutics to greatly enhance treatment efficiency without systemic side-effects. SIGNIFICANCE STATEMENT: Iontronic pumps (GemIPs) provide continuous and localized administration of the chemotherapeutic gemcitabine (Gem) for treating glioblastoma in vivo. By generating high and constant drug concentrations near the vascularized growing tumor, GemIPs offer an efficient and less harmful alternative to systemic administration. Continuous GemIP dosing resulted in remarkable growth inhibition, superior to daily topical Gem application at higher doses. Our digital modelling shows the advantages of iontronic chemotherapy in overcoming limitations of burst release and transient concentration profiles, and providing precise control over dosing profiles and local distribution. This technology holds promise for future implants, could revolutionize treatment strategies, and offers a new platform for studying the influence of timing and dosing dependencies of already-established drugs in the fight against hard-to-treat tumors.
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Affiliation(s)
- Verena Handl
- Gottfried Schatz Research Center - Medical Physics and Biophysics, Medical University of Graz, 8010 Graz, Austria
| | - Linda Waldherr
- Gottfried Schatz Research Center - Medical Physics and Biophysics, Medical University of Graz, 8010 Graz, Austria; BioTechMed-Graz, Austria, Auenbruggerplatz 30, 8036 Graz, Austria
| | - Theresia Arbring Sjöström
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
| | - Tobias Abrahamsson
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
| | - Maria Seitanidou
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
| | - Sabine Erschen
- Gottfried Schatz Research Center - Medical Physics and Biophysics, Medical University of Graz, 8010 Graz, Austria
| | - Astrid Gorischek
- Gottfried Schatz Research Center - Medical Physics and Biophysics, Medical University of Graz, 8010 Graz, Austria
| | - Iwona Bernacka-Wojcik
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
| | - Helena Saarela
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
| | - Tamara Tomin
- Institute of Chemical Technologies and Analytics, Technische Universität Wien, 1060 Vienna, Austria
| | - Sophie Elisabeth Honeder
- Institute of Chemical Technologies and Analytics, Technische Universität Wien, 1060 Vienna, Austria; Diagnostic and Research Institute of Pathology, Medical University of Graz, 8010 Graz, Austria
| | - Joachim Distl
- Gottfried Schatz Research Center - Medical Physics and Biophysics, Medical University of Graz, 8010 Graz, Austria
| | - Waltraud Huber
- Otto Loewi Research Center, Division of Immunology, Research Unit CAM Lab, Medical University of Graz, 8010 Graz, Austria
| | - Martin Asslaber
- Diagnostic and Research Institute of Pathology, Medical University of Graz, 8010 Graz, Austria
| | - Ruth Birner-Grünberger
- Institute of Chemical Technologies and Analytics, Technische Universität Wien, 1060 Vienna, Austria; Diagnostic and Research Institute of Pathology, Medical University of Graz, 8010 Graz, Austria
| | - Ute Schäfer
- Research Unit for Experimental Neurotraumatology, Medical University of Graz, 8010 Graz, Austria
| | - Magnus Berggren
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
| | - Rainer Schindl
- Gottfried Schatz Research Center - Medical Physics and Biophysics, Medical University of Graz, 8010 Graz, Austria; BioTechMed-Graz, Austria, Auenbruggerplatz 30, 8036 Graz, Austria.
| | - Silke Patz
- Research Unit for Experimental Neurotraumatology, Medical University of Graz, 8010 Graz, Austria.
| | - Daniel T Simon
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden.
| | - Nassim Ghaffari-Tabrizi-Wizsy
- Otto Loewi Research Center, Division of Immunology, Research Unit CAM Lab, Medical University of Graz, 8010 Graz, Austria.
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Shrestha N, Zorn-Pauly K, Mesirca P, Koyani CN, Wölkart G, Di Biase V, Torre E, Lang P, Gorischek A, Schreibmayer W, Arnold R, Maechler H, Mayer B, von Lewinski D, Torrente AG, Mangoni ME, Pelzmann B, Scheruebel S. Lipopolysaccharide-induced sepsis impairs M2R-GIRK signaling in the mouse sinoatrial node. Proc Natl Acad Sci U S A 2023; 120:e2210152120. [PMID: 37406102 PMCID: PMC10334783 DOI: 10.1073/pnas.2210152120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 05/15/2023] [Indexed: 07/07/2023] Open
Abstract
Sepsis has emerged as a global health burden associated with multiple organ dysfunction and 20% mortality rate in patients. Numerous clinical studies over the past two decades have correlated the disease severity and mortality in septic patients with impaired heart rate variability (HRV), as a consequence of impaired chronotropic response of sinoatrial node (SAN) pacemaker activity to vagal/parasympathetic stimulation. However, the molecular mechanism(s) downstream to parasympathetic inputs have not been investigated yet in sepsis, particularly in the SAN. Based on electrocardiography, fluorescence Ca2+ imaging, electrophysiology, and protein assays from organ to subcellular level, we report that impaired muscarinic receptor subtype 2-G protein-activated inwardly-rectifying potassium channel (M2R-GIRK) signaling in a lipopolysaccharide-induced proxy septic mouse model plays a critical role in SAN pacemaking and HRV. The parasympathetic responses to a muscarinic agonist, namely IKACh activation in SAN cells, reduction in Ca2+ mobilization of SAN tissues, lowering of heart rate and increase in HRV, were profoundly attenuated upon lipopolysaccharide-induced sepsis. These functional alterations manifested as a direct consequence of reduced expression of key ion-channel components (GIRK1, GIRK4, and M2R) in the mouse SAN tissues and cells, which was further evident in the human right atrial appendages of septic patients and likely not mediated by the common proinflammatory cytokines elevated in sepsis.
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Affiliation(s)
- Niroj Shrestha
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
| | - Klaus Zorn-Pauly
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
| | - Pietro Mesirca
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, Inserm, 34094Montpellier, France
- Laboratory of Excellence in Ion Channels Science and Therapeutics, 34094Montpellier, France
| | - Chintan N. Koyani
- Division of Cardiology, Medical University of Graz, 8036Graz, Austria
| | - Gerald Wölkart
- Department of Pharmacology and Toxicology, University of Graz, 8010Graz, Austria
| | - Valentina Di Biase
- Institute of Pharmacology, Medical University of Innsbruck, 6020Innsbruck, Austria
| | - Eleonora Torre
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, Inserm, 34094Montpellier, France
- Laboratory of Excellence in Ion Channels Science and Therapeutics, 34094Montpellier, France
| | - Petra Lang
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
| | - Astrid Gorischek
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
| | - Wolfgang Schreibmayer
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
| | - Robert Arnold
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
| | - Heinrich Maechler
- Division of Cardiac Surgery, Medical University of Graz, 8036Graz, Austria
| | - Bernd Mayer
- Department of Pharmacology and Toxicology, University of Graz, 8010Graz, Austria
| | - Dirk von Lewinski
- Division of Cardiology, Medical University of Graz, 8036Graz, Austria
| | - Angelo G. Torrente
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, Inserm, 34094Montpellier, France
- Laboratory of Excellence in Ion Channels Science and Therapeutics, 34094Montpellier, France
| | - Matteo E. Mangoni
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, Inserm, 34094Montpellier, France
- Laboratory of Excellence in Ion Channels Science and Therapeutics, 34094Montpellier, France
| | - Brigitte Pelzmann
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
| | - Susanne Scheruebel
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical Physics and Biophysics, Medical University of Graz, 8010Graz, Austria
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Pelzmann B, Hatab A, Scheruebel S, Langthaler S, Rienmueller T, Sokolowski A, Gorischek A, Platzer D, Zorn-Pauly K, Jahn SW, Bauernhofer T, Schreibmayer W. Consequences of somatic mutations of GIRK1 detected in primary malign tumors on expression and function of G-protein activated, inwardly rectifying, K+ channels. Front Oncol 2022; 12:998907. [DOI: 10.3389/fonc.2022.998907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 10/05/2022] [Indexed: 11/13/2022] Open
Abstract
A search in the GDC Data Portal revealed 304 documented somatic mutations of the KCNJ3 gene in primary tumors (out of 10.202 cases). Most affected tumor types were carcinomas from uterus, skin and lung, while breast cancer exerted the lowest number of somatic mutations. We focused our research on 15 missense mutations within the region between TM1 and TM2, comprising the pore helix and ion selectivity signature. Expression was measured by confocal laser scan microscopy of eGFP tagged GIRK1 subunits, expressed with and without GIRK4 in oocytes of Xenopus laevis. GIRK ion currents were activated via coexpressed m2Rs and measured by the Two Electrode Voltage Clamp technique. Magnitude of the total GIRK current, as well as the fraction of current inducible by the agonist, were measured. Ion selectivity was gauged by assessment of the PNa+/PK+ ratio, calculated by the GIRK current reversal potential in extracellular media at different Na+ and K+ concentrations. None of the tested mutations was able to form functional GIRK1 homooligomeric ion channels. One of the mutations, G145A, which locates directly to the ion selectivity signature, exerted an increased PNa+/PK+ ratio. Generally, the missense mutations studied can be categorized into three groups: (i) normal/reduced expression accompanied by reduced/absent function (S132Y, F136L, E139K, G145A, R149Q, R149P, G178D, S185Y, Q186R), (ii) normal/increased expression as well as increased function (E140M, A142T, M184I) and (iii) miniscule expression but increased function relative to expression levels (I151N, G158S). We conclude, that gain of function mutations, identical or similar to categories (ii) and (iii), may potentially be involved in genesis and progression of malignancies in tissues that exert a high rate of occurrence of somatic mutations of KCNJ3.
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Schratter G, Scheruebel S, Langthaler S, Ester K, Pelzmann B, Ghaffari-Tabrizi-Wizsy N, Rezania S, Gorischek A, Platzer D, Zorn-Pauly K, Ahammer H, Prokesch A, Stanzer S, Devaney TTJ, Schmidt K, Jahn SW, Prassl R, Bauernhofer T, Schreibmayer W. GIRK1 triggers multiple cancer-related pathways in the benign mammary epithelial cell line MCF10A. Sci Rep 2019; 9:19277. [PMID: 31848385 PMCID: PMC6917815 DOI: 10.1038/s41598-019-55683-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 11/21/2019] [Indexed: 11/20/2022] Open
Abstract
Excessive expression of subunit 1 of GIRK1 in ER+ breast tumors is associated with reduced survival times and increased lymph node metastasis in patients. To investigate possible tumor-initiating properties, benign MCF10A and malign MCF7 mammary epithelial cells were engineered to overexpress GIRK1 neoplasia associated vital parameters and resting potentials were measured and compared to controls. The presence of GIRK1 resulted in resting potentials negative to the controls. Upon GIRK1 overexpression, several cellular pathways were regulated towards pro-tumorigenic action as revealed by comparison of transcriptomes of MCF10AGIRK1 with the control (MCF10AeGFP). According to transcriptome analysis, cellular migration was promoted while wound healing and extracellular matrix interactions were impaired. Vital parameters in MCF7 cells were affected akin the benign MCF10A lines, but to a lesser extent. Thus, GIRK1 regulated cellular pathways in mammary epithelial cells are likely to contribute to the development and progression of breast cancer.
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Affiliation(s)
- Gebhard Schratter
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Susanne Scheruebel
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Sonja Langthaler
- Institute for Health Care Engineering with European Testing Center of Medical Devices, Graz University of Technology, Graz, Austria
| | - Katja Ester
- Laboratory of Experimental Therapy, Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička 54, 10000, Zagreb, Croatia
| | - Brigitte Pelzmann
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | | | - Simin Rezania
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Astrid Gorischek
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Dieter Platzer
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Klaus Zorn-Pauly
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Helmut Ahammer
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
| | - Andreas Prokesch
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Cell Biology, Histology and Embryology, Medical University of Graz, Graz, Austria
- BioTechMed-Graz, 8010, Graz, Austria
| | - Stefanie Stanzer
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Trevor T J Devaney
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Kurt Schmidt
- Institute of Pharmaceutical Sciences, Karl Franzens University of Graz, Graz, Austria
| | - Stephan W Jahn
- Diagnostic & Research Institute of Pathology, Medical University of Graz, Graz, Austria
| | - Ruth Prassl
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Thomas Bauernhofer
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Wolfgang Schreibmayer
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria.
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria.
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Rezania S, Kammerer S, Li C, Steinecker-Frohnwieser B, Gorischek A, DeVaney TTJ, Verheyen S, Passegger CA, Tabrizi-Wizsy NG, Hackl H, Platzer D, Zarnani AH, Malle E, Jahn SW, Bauernhofer T, Schreibmayer W. Overexpression of KCNJ3 gene splice variants affects vital parameters of the malignant breast cancer cell line MCF-7 in an opposing manner. BMC Cancer 2016; 16:628. [PMID: 27519272 PMCID: PMC4983040 DOI: 10.1186/s12885-016-2664-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 08/03/2016] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Overexpression the KCNJ3, a gene that encodes subunit 1 of G-protein activated inwardly rectifying K(+) channel (GIRK1) in the primary tumor has been found to be associated with reduced survival times and increased lymph node metastasis in breast cancer patients. METHODS In order to survey possible tumorigenic properties of GIRK1 overexpression, a range of malignant mammary epithelial cells, based on the MCF-7 cell line that permanently overexpress different splice variants of the KCNJ3 gene (GIRK1a, GIRK1c, GIRK1d and as a control, eYFP) were produced. Subsequently, selected cardinal neoplasia associated cellular parameters were assessed and compared. RESULTS Adhesion to fibronectin coated surface as well as cell proliferation remained unaffected. Other vital parameters intimately linked to malignancy, i.e. wound healing, chemoinvasion, cellular velocities / motilities and angiogenesis were massively affected by GIRK1 overexpression. Overexpression of different GIRK1 splice variants exerted differential actions. While GIRK1a and GIRK1c overexpression reinforced the affected parameters towards malignancy, overexpression of GIRK1d resulted in the opposite. Single channel recording using the patch clamp technique revealed functional GIRK channels in the plasma membrane of MCF-7 cells albeit at very low frequency. DISCUSSION We conclude that GIRK1d acts as a dominant negative constituent of functional GIRK complexes present in the plasma membrane of MCF-7 cells, while overexpression of GIRK1a and GIRK1c augmented their activity. The core component responsible for the cancerogenic action of GIRK1 is apparently presented by a segment comprising aminoacids 235-402, that is present exclusively in GIRK1a and GIRK1c, but not GIRK1d (positions according to GIRK1a primary structure). CONCLUSIONS The current study provides insight into the cellular and molecular consequences of KCNJ3 overexpression in breast cancer cells and the mechanism upon clinical outcome in patients suffering from breast cancer.
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Affiliation(s)
- S. Rezania
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - S. Kammerer
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - C. Li
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - B. Steinecker-Frohnwieser
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
- Present address: Institute of Human Genetics, Medical University of Graz, Graz, Austria
| | - A. Gorischek
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - T. T. J. DeVaney
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - S. Verheyen
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
- Present address: Institute of Human Genetics, Medical University of Graz, Graz, Austria
| | - C. A. Passegger
- Institute of Pathophysiology and Immunology, SFL Chicken CAM Laboratory, Medical University of Graz, Graz, Austria
| | - N. Ghaffari Tabrizi-Wizsy
- Institute of Pathophysiology and Immunology, SFL Chicken CAM Laboratory, Medical University of Graz, Graz, Austria
| | - H. Hackl
- Division of Bioinformatics, Biocenter, Medical University of Innsbruck, Innsbruck, Austria
| | - D. Platzer
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
| | - A. H. Zarnani
- Nanobiotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - E. Malle
- Institute of Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria
| | - S. W. Jahn
- Institute of Pathology, Medical University of Graz, Graz, Austria
| | - T. Bauernhofer
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - W. Schreibmayer
- Institute of Biophysics, Molecular Physiology Group, Medical University of Graz, Harrachgasse 21/4, Graz, Austria
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
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Li C, Rezania S, Kammerer S, Sokolowski A, Devaney T, Gorischek A, Jahn S, Hackl H, Groschner K, Windpassinger C, Malle E, Bauernhofer T, Schreibmayer W. Piezo1 forms mechanosensitive ion channels in the human MCF-7 breast cancer cell line. Sci Rep 2015; 5:8364. [PMID: 25666479 PMCID: PMC4322926 DOI: 10.1038/srep08364] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [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: 09/10/2014] [Accepted: 12/23/2014] [Indexed: 01/30/2023] Open
Abstract
Mechanical interaction between cells - specifically distortion of tensional homeostasis-emerged as an important aspect of breast cancer genesis and progression. We investigated the biophysical characteristics of mechanosensitive ion channels (MSCs) in the malignant MCF-7 breast cancer cell line. MSCs turned out to be the most abundant ion channel species and could be activated by negative pressure at the outer side of the cell membrane in a saturable manner. Assessing single channel conductance (GΛ) for different monovalent cations revealed an increase in the succession: Li(+) < Na(+) < K(+) ≈Rb(+) ≈ Cs(+). Divalent cations permeated also with the order: Ca(2+) < Ba(2+). Comparison of biophysical properties enabled us to identify MSCs in MCF-7 as ion channels formed by the Piezo1 protein. Using patch clamp technique no functional MSCs were observed in the benign MCF-10A mammary epithelial cell line. Blocking of MSCs by GsMTx-4 resulted in decreased motility of MCF-7, but not of MCF-10A cells, underscoring a possible role of Piezo1 in invasion and metastatic propagation. The role of Piezo1 in biology and progression of breast cancer is further substantiated by markedly reduced overall survival in patients with increased Piezo1 mRNA levels in the primary tumor.
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Affiliation(s)
- Chouyang Li
- Department of Biophysics, Medical University of Graz, Graz, Austria
| | - Simin Rezania
- Department of Biophysics, Medical University of Graz, Graz, Austria
| | - Sarah Kammerer
- Department of Biophysics, Medical University of Graz, Graz, Austria
| | - Armin Sokolowski
- Department of Biophysics, Medical University of Graz, Graz, Austria
| | - Trevor Devaney
- Department of Biophysics, Medical University of Graz, Graz, Austria
| | - Astrid Gorischek
- Department of Biophysics, Medical University of Graz, Graz, Austria
| | - Stephan Jahn
- Department of Pathology, Medical University of Graz, Graz, Austria
| | - Hubert Hackl
- Division of Bioinformatics, Biocenter, Innsbruck Medical University, Innsbruck, Austria
| | - Klaus Groschner
- Department of Biophysics, Medical University of Graz, Graz, Austria
| | | | - Ernst Malle
- Institute of Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria
| | - Thomas Bauernhofer
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
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Li C, Rezania S, Kammerer S, Gorischek A, Bauernhofer T, Schreibmayer W. Mechano-Sensitive Ion Channels (MSCS) Provide Human Breast Cancer Cells with a Sensorium for Mechanical Stress. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.3061] [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: 10/23/2022] Open
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Rezania S, Li C, Kammerer S, Gorischek A, Devaney T, Zarnani AH, Bauernhofer T, Schreibmayer W. G-Protein Activated Inwardly Rectifying Potassium Channels Control Motility of Breast Cancer Cells. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.3026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Wagner V, Stadelmeyer E, Riederer M, Regitnig P, Gorischek A, Devaney T, Schmidt K, Tritthart HA, Hirschberg K, Bauernhofer T, Schreibmayer W. Cloning and characterisation of GIRK1 variants resulting from alternative RNA editing of the KCNJ3 gene transcript in a human breast cancer cell line. J Cell Biochem 2010; 110:598-608. [PMID: 20512921 DOI: 10.1002/jcb.22564] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The aim of this study was to investigate the impact of increased mRNA levels encoding GIRK1 in breast tumours on GIRK protein expression. mRNA levels encoding hGIRK1 and hGIRK4 in the MCF7, MCF10A and MDA-MB-453 breast cancer cell lines were assessed and the corresponding proteins detected using Western blots. cDNAs encoding for four hGIRK1 splice variants (hGIRK1a, 1c, 1d and 1e) were cloned from the MCF7 cell line. Subcellular localisation of fluorescence labelled hGIRK1a-e and hGIRK4 and of endogenous GIRK1 and GIRK4 subunits was monitored in the MCF7 cell line. All hGIRK1 splice variants and hGIRK4 were predominantly located within the endoplasmic reticulum. Heterologous expression in Xenopus laevis oocytes and two electrode voltage clamp experiments together with confocal microscopy were performed. Only the hGIRK1a subunit was able to form functional GIRK channels in connection with hGIRK4. The other splice variants are expressed, but exert a dominant negative effect on heterooligomeric channel function. Hence, alternative splicing of the KCNJ3 gene transcript in the MCF7 cell line leads to a family of mRNA's, encoding truncated versions of the hGIRK1 protein. The very high abundance of mRNA's encoding GIRK1 together with the presence of GIRK1 protein suggests a pathophysiological role in breast cancer.
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Affiliation(s)
- Valerie Wagner
- Institute for Biophysics, Center of Physiological Medicine, Medical University of Graz, Graz, Austria
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Poparic I, Gorischek A, Wagner V, Wagner K, Windpassinger C, Schreibmayer W. Four and a Half Lim Domains (FHL) Genes Reduce Conductivity of the KCNA5 Channel. Biophys J 2010. [DOI: 10.1016/j.bpj.2009.12.1713] [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: 11/16/2022] Open
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Müllner C, Steinecker B, Gorischek A, Schreibmayer W. Identification of the structural determinant responsible for the phosphorylation of G-protein activated potassium channel 1 by cAMP-dependent protein kinase. FEBS J 2009; 276:6218-26. [DOI: 10.1111/j.1742-4658.2009.07325.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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