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Mizejewski GJ. The Role of Ion Channels and Chemokines in Cancer Growth and Metastasis: A Proposed Mode of Action Using Peptides in Cancer Therapy. Cancers (Basel) 2024; 16:1531. [PMID: 38672613 PMCID: PMC11048196 DOI: 10.3390/cancers16081531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 04/12/2024] [Accepted: 04/12/2024] [Indexed: 04/28/2024] Open
Abstract
Metastasis (Met) largely contributes to the major cause of cancer deaths throughout the world, rather than the growth of the tumor mass itself. The present report brings together several of the pertinent contributors to cancer growth and metastatic processes from an activity standpoint. Such biological activities include the following: (1) cell adherence and detachment; (2) cell-to-cell contact; (3) contact inhibition; (4) the cell interfacing with the extracellular matrix (ECM); (5) tumor cell-to-stroma communication networks; (6) chemotaxis; and (7) cell membrane potential. Moreover, additional biochemical factors that contribute to cancer growth and metastasis have been shown to comprise the following: (a) calcium levels in the extracellular matrix and in intracellular compartments; (b) cation voltage and ATP-regulated potassium channels; (c) selective and non-selective cation channels; and (d) chemokines (cytokines) and their receptors, such as CXCL12 (SDF-1) and its receptor/binding partner, CXCR4. These latter molecular components represent a promising group of an interacting and synchronized set of candidates ideal for peptide therapeutic targeting for cancer growth and metastasis. Such peptides can be obtained from naturally occurring proteins such as alpha-fetoprotein (AFP), an onco-fetal protein and clinical biomarker.
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Affiliation(s)
- Gerald J. Mizejewski
- Division of Translational Medicine, Molecular Diagnostics Laboratory, Albany, NY 12201, USA; ; Tel.: +518-486-5900; Fax: +518-402-5002
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201, USA
- Biggs Laboratory, Empire State Plaza, Albany, NY 12237, USA
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2
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Rodríguez SG, Crosby P, Hansen LL, Grünewald E, Beale AD, Spangler RK, Rabbitts BM, Partch CL, Stangherlin A, O’Neill JS, van Ooijen G. Potassium rhythms couple the circadian clock to the cell cycle. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.02.587153. [PMID: 38617352 PMCID: PMC11014554 DOI: 10.1101/2024.04.02.587153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
Circadian (~24 h) rhythms are a fundamental feature of life, and their disruption increases the risk of infectious diseases, metabolic disorders, and cancer1-6. Circadian rhythms couple to the cell cycle across eukaryotes7,8 but the underlying mechanism is unknown. We previously identified an evolutionarily conserved circadian oscillation in intracellular potassium concentration, [K+]i9,10. As critical events in the cell cycle are regulated by intracellular potassium11,12, an enticing hypothesis is that circadian rhythms in [K+]i form the basis of this coupling. We used a minimal model cell, the alga Ostreococcus tauri, to uncover the role of potassium in linking these two cycles. We found direct reciprocal feedback between [K+]i and circadian gene expression. Inhibition of proliferation by manipulating potassium rhythms was dependent on the phase of the circadian cycle. Furthermore, we observed a total inhibition of cell proliferation when circadian gene expression is inhibited. Strikingly, under these conditions a sudden enforced gradient of extracellular potassium was sufficient to induce a round of cell division. Finally, we provide evidence that interactions between potassium and circadian rhythms also influence proliferation in mammalian cells. These results establish circadian regulation of intracellular potassium levels as a primary factor coupling the cell- and circadian cycles across diverse organisms.
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Affiliation(s)
- Sergio Gil Rodríguez
- School of Biological Sciences, University of Edinburgh, Max Born Crescent EH9 3BF Edinburgh, United Kingdom
| | - Priya Crosby
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Louise L. Hansen
- School of Biological Sciences, University of Edinburgh, Max Born Crescent EH9 3BF Edinburgh, United Kingdom
| | - Ellen Grünewald
- School of Biological Sciences, University of Edinburgh, Max Born Crescent EH9 3BF Edinburgh, United Kingdom
| | - Andrew D. Beale
- UKRI MRC Laboratory of Molecular Biology, Francis Crick Ave, Cambridge, CB2 0QH, United Kingdom
| | - Rebecca K. Spangler
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Beverley M. Rabbitts
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Carrie L. Partch
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Alessandra Stangherlin
- Faculty of Medicine and University Hospital Cologne, Cluster of Excellence Cellular Stress Responses in Aging-associated Diseases (CECAD), Institute for Mitochondrial Diseases and Ageing, University of Cologne, Joseph-Stelzmann-Str, 50931, Cologne, Germany
| | - John S. O’Neill
- UKRI MRC Laboratory of Molecular Biology, Francis Crick Ave, Cambridge, CB2 0QH, United Kingdom
| | - Gerben van Ooijen
- School of Biological Sciences, University of Edinburgh, Max Born Crescent EH9 3BF Edinburgh, United Kingdom
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Khokhar D, Marella S, Idelman G, Chang JW, Chehade M, Hogan SP. Eosinophilic esophagitis: Immune mechanisms and therapeutic targets. Clin Exp Allergy 2022; 52:1142-1156. [PMID: 35778876 PMCID: PMC9547832 DOI: 10.1111/cea.14196] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 06/08/2022] [Accepted: 06/20/2022] [Indexed: 01/26/2023]
Abstract
Eosinophilic esophagitis (EoE) is an emerging chronic inflammatory disease of the oesophagus and is clinically characterized by upper gastrointestinal (GI) symptoms including dysphagia and esophageal food impaction. Histopathologic manifestations, which include intraepithelial eosinophilic inflammation and alterations of the esophageal squamous epithelium, such as basal zone hyperplasia (BZH) and dilated intercellular spaces (DIS), are thought to contribute to esophageal dysfunction and disease symptoms. Corroborative clinical and discovery science-based studies have established that EoE is characterized by an underlying allergic inflammatory response, in part, related to the IL-13/CCL26/eosinophil axis driving dysregulation of several key epithelial barrier and proliferative regulatory genes including kallikrein (KLK) serine proteases, calpain 14 (CAPN14) and anoctamin 1 (ANO1). The contribution of these inflammatory and proliferative processes to the clinical and histological manifestations of disease are not fully elucidated. Herein, we discuss the immune molecules and cells that are thought to underlie the clinical and pathologic manifestations of EoE and the emerging therapeutics targeting these processes for the treatment of EoE.
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Affiliation(s)
- Dilawar Khokhar
- Division of Allergy and ImmunologyUniversity of MichiganAnn ArborMichiganUSA
- Mary H Weiser Food Allergy CenterUniversity of MichiganAnn ArborMichiganUSA
| | - Sahiti Marella
- Mary H Weiser Food Allergy CenterUniversity of MichiganAnn ArborMichiganUSA
- Department of PathologyUniversity of MichiganAnn ArborMichiganUSA
| | - Gila Idelman
- Mary H Weiser Food Allergy CenterUniversity of MichiganAnn ArborMichiganUSA
| | - Joy W. Chang
- Division of Gastroenterology, Department of Internal MedicineUniversity of MichiganAnn ArborMichiganUSA
| | - Mirna Chehade
- Mount Sinai Center for Eosinophilic DisordersIcahn School of Medicine at Mount SinaiNew YorkNew YorkUSA
| | - Simon P. Hogan
- Mary H Weiser Food Allergy CenterUniversity of MichiganAnn ArborMichiganUSA
- Department of PathologyUniversity of MichiganAnn ArborMichiganUSA
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4
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Gong H, Dai Q, Peng P. Cell-Membrane-Anchored DNA Logic-Gated Nanoassemblies for In Situ Extracellular Bioimaging. ACS APPLIED MATERIALS & INTERFACES 2022; 14:43026-43034. [PMID: 36053489 DOI: 10.1021/acsami.2c13735] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Extracellular K+ and adenosine triphosphate (ATP) levels are significantly elevated in the tumor microenvironment (TME) and can be used as biomarkers for early cancer detection and tumor localization. Most reported TME sensors only respond to single abnormal factors, resulting in a lack of accuracy and specificity for the detection of complex environments. Thus, precisely locating the TME remains challenging. In this work, we aimed to develop an intelligent DNA nanoassembly controlled by a "YES-AND" logic circuit using a bimolecular G-quadruplex (G4) and ATP aptamer as logical control units. As a proof of concept, in the presence of K+ (input 1) and ATP (input 2), the YES-AND Boolean operator returned a true value and the output was the fluorescence resonance energy transfer (FRET) signal, indicating high sensitivity and selectivity. After being anchored to living cell surfaces, this logic nanosensor imaged extracellular K+ and ATP present at abnormal levels in situ. Owing to diverse disease markers in the TME, this novel logic sensor might hold great promise for the targeted delivery of intelligent anticancer drugs and Boolean logic-controlled treatment.
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Affiliation(s)
- Hangsheng Gong
- School of Life Sciences, Anhui Medical University, Hefei, Anhui 230032, China
| | - Qian Dai
- School of Life Sciences, Anhui Medical University, Hefei, Anhui 230032, China
| | - Pai Peng
- School of Life Sciences, Anhui Medical University, Hefei, Anhui 230032, China
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5
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The role of potassium channels in the proliferation and migration of endometrial adenocarcinoma HEC1-A cells. Mol Biol Rep 2022; 49:7447-7454. [PMID: 35553332 DOI: 10.1007/s11033-022-07546-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/29/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Endometrial cancer is the most common gynecological cancer in developed countries. Potassium channels, which have many types, are suggested to play a major role in cancer progression. However, their role in endometrial cancer has not been fully investigated. We aimed to demonstrate whether the ATP-sensitive potassium channel blocker glibenclamide, voltage-sensitive potassium channel blocker 4-aminopyridine, non-selective (voltage-sensitive and calcium-activated) potassium channels blocker tetraethylammonium and potassium chloride (KCl) have any effect on the proliferation and migration of HEC1-A cells. METHODS AND RESULTS Proliferation and migration were evaluated by real-time cell analysis (xCELLigence system) and wound healing assays, respectively. Proliferation was reduced by glibenclamide (0.1 and 0.2 mM, P < 0.05 and P < 0.01, respectively), 4-aminopyridine (10 and 20 mM, P < 0.001) and tetraethylammonium (10 and 20 mM, P < 0.01 and P < 0.001, respectively). However, KCl did not change the proliferation. Migration was reduced by glibenclamide (0.01, 0.1 and 0.2 mM, P < 0.001, P < 0.001 and P < 0.01, respectively) and 4-aminopyridine (10 and 20 mM, P < 0.05 and P < 0.01, respectively). Tetraethylammonium did not change migration. However, KCl reduced it (10, 25 and 50 mM, P < 0.05, P < 0.01 and P < 0.01, respectively). Both proliferation and migration were reduced by glibenclamide and 4-aminopyridine. However, tetraethylammonium only reduced proliferation and KCl only reduced migration. CONCLUSIONS Potassium channels have an important role in HEC1-A cell proliferation and migration and potassium channel blockers needs to be further investigated for their therapeutic effect in endometrial cancer.
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6
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Langthaler S, Rienmüller T, Scheruebel S, Pelzmann B, Shrestha N, Zorn-Pauly K, Schreibmayer W, Koff A, Baumgartner C. A549 in-silico 1.0: A first computational model to simulate cell cycle dependent ion current modulation in the human lung adenocarcinoma. PLoS Comput Biol 2021; 17:e1009091. [PMID: 34157016 PMCID: PMC8219159 DOI: 10.1371/journal.pcbi.1009091] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 05/18/2021] [Indexed: 11/18/2022] Open
Abstract
Lung cancer is still a leading cause of death worldwide. In recent years, knowledge has been obtained of the mechanisms modulating ion channel kinetics and thus of cell bioelectric properties, which is promising for oncological biomarkers and targets. The complex interplay of channel expression and its consequences on malignant processes, however, is still insufficiently understood. We here introduce the first approach of an in-silico whole-cell ion current model of a cancer cell, in particular of the A549 human lung adenocarcinoma, including the main functionally expressed ion channels in the plasma membrane as so far known. This hidden Markov-based model represents the electrophysiology behind proliferation of the A549 cell, describing its rhythmic oscillation of the membrane potential able to trigger the transition between cell cycle phases, and it predicts membrane potential changes over the cell cycle provoked by targeted ion channel modulation. This first A549 in-silico cell model opens up a deeper insight and understanding of possible ion channel interactions in tumor development and progression, and is a valuable tool for simulating altered ion channel function in lung cancer electrophysiology.
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Affiliation(s)
- Sonja Langthaler
- Institute of Health Care Engineering with European Testing Center for Medical Devices, Graz University of Technology, Graz, Austria
| | - Theresa Rienmüller
- Institute of Health Care Engineering with European Testing Center for Medical Devices, Graz University of Technology, Graz, Austria
| | - Susanne Scheruebel
- Research Unit on Ion Channels and Cancer Biology, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
| | - Brigitte Pelzmann
- Research Unit on Ion Channels and Cancer Biology, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
| | - Niroj Shrestha
- Research Unit on Ion Channels and Cancer Biology, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
| | - Klaus Zorn-Pauly
- Research Unit on Ion Channels and Cancer Biology, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
| | - Wolfgang Schreibmayer
- Research Unit on Ion Channels and Cancer Biology, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
| | - Andrew Koff
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York City, New York, United States of America
| | - Christian Baumgartner
- Institute of Health Care Engineering with European Testing Center for Medical Devices, Graz University of Technology, Graz, Austria
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7
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Szymczak-Pajor I, Fleszar K, Kasznicki J, Gralewska P, Śliwińska A. A potential role of calpains in sulfonylureas (SUs) -mediated death of human pancreatic cancer cells (1.2B4). Toxicol In Vitro 2021; 73:105128. [PMID: 33652124 DOI: 10.1016/j.tiv.2021.105128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 02/01/2021] [Accepted: 02/25/2021] [Indexed: 12/25/2022]
Abstract
Sulfonylureas (SUs) are suggested to accelerate the pancreatic β-cells mass loss via apoptosis. However, little is known whether calpains mediate this process. The aim of the present study is to evaluate the involvement of calpains in SUs-induced death of human pancreatic cancer (PC) cell line 1.2B4. The cells were exposed to: glibenclamide, glimepiride and gliclazide for 72 h. The expression analysis of caspase-3 (CASP-3), TP53, calpain 1 (CAPN-1), calpain 2 (CAPN-2) and calpain 10 (CAPN-10) was detected using RT-PCR method. Intracellular Ca2+ concentrations, CASP-3 activity and total calpain activity were also evaluated. Our results have shown that glibenclamide and glimepiride decrease 1.2B4 cells viability with accompanied increase in intracellular Ca2+ concentration and increased expression of apoptosis-related CASP-3 and TP53. Gliclazide did not affect 1.2B4 cell viability and Ca2+ concentration, however, it downregulated CASP-3 and upregulated TP53. Interestingly, 50 μM glimepiride increased expression of CAPN-1, CAPN-2 and CAPN-10 whereas 50 μM glibenclamide solely upregulated CAPN-2 expression. We have shown that 10 μM and 50 μM glibenclamide and glimepiride increased the activity of CASP-3, but decreased total calpain activity. Our results suggest that calpains may be involved in glibenclamide- and glimepiride-induced death of PC cells. However, further investigation is required to confirm the engagement of calpains in SUs-mediated death of PC cells, especially studies on protein level of particular isoforms of calpains should be conducted.
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Affiliation(s)
- Izabela Szymczak-Pajor
- Department of Nucleic Acid Biochemistry, Medical University of Lodz, 251 Pomorska, 92-213 Lodz, Poland.
| | - Krzysztof Fleszar
- Student Scientific Society of Civilization Diseases, Medical University of Lodz, 251 Pomorska, 92-213 Lodz, Poland.
| | - Jacek Kasznicki
- Department of Internal Diseases, Diabetology and Clinical Pharmacology, Medical University of Lodz, 251 Pomorska, 92-213 Lodz, Poland.
| | - Patrycja Gralewska
- Department of Medical Biophysics, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska 141/143, 90-236 Lodz, Poland.
| | - Agnieszka Śliwińska
- Department of Nucleic Acid Biochemistry, Medical University of Lodz, 251 Pomorska, 92-213 Lodz, Poland.
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8
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Martins TJ, Negri LB, Pernomian L, Faial KDCF, Xue C, Akhimie RN, Hamblin MR, Turro C, da Silva RS. The Influence of Some Axial Ligands on Ruthenium-Phthalocyanine Complexes: Chemical, Photochemical, and Photobiological Properties. Front Mol Biosci 2021; 7:595830. [PMID: 33511155 PMCID: PMC7835839 DOI: 10.3389/fmolb.2020.595830] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 11/17/2020] [Indexed: 11/26/2022] Open
Abstract
This work presents a new procedure to synthesize ruthenium–phthalocyanine complexes and uses diverse spectroscopic techniques to characterize trans-[RuCl(Pc)DMSO] (I) (Pc = phthalocyanine) and trans-[Ru(Pc)(4-ampy)2] (II) (4-ampy = 4-aminopyridine). The triplet excited-state lifetimes of (I) measured by nanosecond transient absorption showed that two processes occurred, one around 15 ns and the other around 3.8 μs. Axial ligands seemed to affect the singlet oxygen quantum yield. Yields of 0.62 and 0.14 were achieved for (I) and (II), respectively. The lower value obtained for (II) probably resulted from secondary reactions of singlet oxygen in the presence of the ruthenium complex. We also investigate how axial ligands in the ruthenium–phthalocyanine complexes affect their photo-bioactivity in B16F10 murine melanoma cells. In the case of (I) at 1 μmol/L, photosensitization with 5.95 J/cm2 provided B16F10 cell viability of 6%, showing that (I) was more active than (II) at the same concentration. Furthermore, (II) was detected intracellularly in B16F10 cell extracts. The behavior of the evaluated ruthenium–phthalocyanine complexes point to the potential use of (I) as a metal-based drug in clinical therapy. Changes in axial ligands can modulate the photosensitizer activity of the ruthenium phthalocyanine complexes.
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Affiliation(s)
- Tássia Joi Martins
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto University of São Paulo, Ribeirão Preto, Brazil.,Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, United States
| | - Laisa Bonafim Negri
- Department of Physics and Chemistry, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, United States.,Department of Dermatology, Harvard Medical School, Boston, MA, United States
| | - Laena Pernomian
- Department of Physics and Chemistry, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.,Department of Pharmacology of the School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | | | - Congcong Xue
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, United States
| | - Regina N Akhimie
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, United States
| | - Michael R Hamblin
- Laser Research Center, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa
| | - Claudia Turro
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, United States
| | - Roberto S da Silva
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto University of São Paulo, Ribeirão Preto, Brazil.,Department of Physics and Chemistry, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, United States.,Department of Dermatology, Harvard Medical School, Boston, MA, United States
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9
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Rosendo-Pineda MJ, Moreno CM, Vaca L. Role of ion channels during cell division. Cell Calcium 2020; 91:102258. [PMID: 32736154 DOI: 10.1016/j.ceca.2020.102258] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/20/2020] [Accepted: 07/20/2020] [Indexed: 02/06/2023]
Abstract
Ion channels are transmembrane proteins whose canonical function is the transport of ions across the plasma membrane to regulate cell membrane potential and play an essential role in neural communication, nerve conduction, and muscle contraction. However, over the last few years, non-canonical functions have been identified for many channels, having active roles in phagocytosis, invasiveness, proliferation, among others. The participation of some channels in cell proliferation has raised the question of whether they may play an active role in mitosis. There are several reports showing the participation of channels during interphase, however, the direct participation of ion channels in mitosis has received less attention. In this article, we summarize the current evidence on the participation of ion channels in mitosis. We also summarize some tools that would allow the study of ion channels and cell cycle regulatory molecules in individual cells during mitosis.
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Affiliation(s)
| | - Claudia M Moreno
- Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, WA, 98195, USA
| | - Luis Vaca
- Instituto de Fisiología Celular. Universidad Nacional Autónoma de México. Ciudad Universitaria, Coyoacán, DF, 04510, Mexico; Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, WA, 98195, USA.
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10
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Barbirou M, Sghaier I, Bedoui S, Ben Abderrazek R, Kraiem H, Farah A, Hassiki R, Mokrani A, Mezlini A, Almawi WY, Loueslati-Yacoubi B, Bouhaouala-Zahar B. KCNB1 gene polymorphisms and related indel as predictor biomarkers of treatment response for colorectal cancer - toward a personalized medicine. Tumour Biol 2020; 42:1010428320925237. [PMID: 32484056 DOI: 10.1177/1010428320925237] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The KCNB1 gene variants were differentially associated with cancers. However, their association with colorectal cancer has not yet been explored. We investigated the contribution of the KCNB1 gene variants rs3331, rs1051295, and indel (insertion/deletion) rs11468831 Polymorphism as predictors of the treatment response in colorectal cancer patients. A retrospective study, which involved 291 Tunisian colorectal cancer patients (aged 60.0 ± 13.1 years), who were stratified into responder and non-responder groups, according to TNM stages and their responsiveness to chemotherapy based on fluorouracil. KCNB1 genotyping was performed with amplification-refractory mutation system-polymerase chain reaction, and was confirmed by Sanger sequencing. Sex-specific response was found and colorectal cancer females are less likely to achieve a positive response during the chemotherapy strategy, compared to males. Weight and body mass index, tumor size, and tumor localization are considered as predictive factors to treatment responsiveness. Carriage of rs11468831 Ins allele was significantly associated with successful therapy achievement (p adjusted < 0.001). Stratification of colorectal cancer patients' response according to tumor localization and TNM stages reveals negative association of rs3331 Major allele to treatment response among the patients with advanced cancer stages (subgroup G2). The presence of rs3331 (homozygous minor) C/C genotype was positively associated with decline in carcino-embryonic antigen (p = 0.043) and CA19-9 (p = 0.014) serum levels. On the other hand, the presence of rs1051295 (homozygous minor) A/A genotype was correlated with marked decline in CA19-9 serum levels. KCNB1 haplotype did not reveal any association between haplotypes and treatment response. The results obtained suggest that gender-specific strategies for screening treatment and prevention protocols as well as KCNB1 variants may constitute an effective model for ongoing personalization medicine.
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Affiliation(s)
- Mouadh Barbirou
- Laboratory of Venoms and Therapeutic Molecules, Pasteur Institute of Tunis, Tunis Belvédère- University of Tunis El Manar, Tunis, Tunisia.,Department of Health Management and Informatics, Center for Biomedical Informatics, School of Medicine, University of Missouri, Columbia, MO, USA
| | - Ikram Sghaier
- Department of Health Management and Informatics, Center for Biomedical Informatics, School of Medicine, University of Missouri, Columbia, MO, USA.,Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Sinda Bedoui
- Laboratory of Mycology, Pathologies and Biomarkers, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Rahma Ben Abderrazek
- Laboratory of Venoms and Therapeutic Molecules, Pasteur Institute of Tunis, Tunis Belvédère- University of Tunis El Manar, Tunis, Tunisia
| | - Hazar Kraiem
- Laboratory of Venoms and Therapeutic Molecules, Pasteur Institute of Tunis, Tunis Belvédère- University of Tunis El Manar, Tunis, Tunisia
| | - Azer Farah
- Laboratory of Venoms and Therapeutic Molecules, Pasteur Institute of Tunis, Tunis Belvédère- University of Tunis El Manar, Tunis, Tunisia
| | - Rym Hassiki
- Laboratory of Venoms and Therapeutic Molecules, Pasteur Institute of Tunis, Tunis Belvédère- University of Tunis El Manar, Tunis, Tunisia
| | | | | | - Wassim Y Almawi
- Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia.,School of Medicine, Nazarbayev University, Nur-Sultan, Kazakhstan
| | - Besma Loueslati-Yacoubi
- Laboratory of Mycology, Pathologies and Biomarkers, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Balkiss Bouhaouala-Zahar
- Laboratory of Venoms and Therapeutic Molecules, Pasteur Institute of Tunis, Tunis Belvédère- University of Tunis El Manar, Tunis, Tunisia.,Medicine School of Tunis, University of Tunis El Manar, Tunis, Tunisia
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11
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Scorpion Toxins and Ion Channels: Potential Applications in Cancer Therapy. Toxins (Basel) 2020; 12:toxins12050326. [PMID: 32429050 PMCID: PMC7290751 DOI: 10.3390/toxins12050326] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 04/14/2020] [Accepted: 04/15/2020] [Indexed: 12/24/2022] Open
Abstract
Apoptosis, a genetically directed process of cell death, has been studied for many years, and the biochemical mechanisms that surround it are well known and described. There are at least three pathways by which apoptosis occurs, and each pathway depends on extra or intracellular processes for activation. Apoptosis is a vital process, but disturbances in proliferation and cell death rates can lead to the development of diseases like cancer. Several compounds, isolated from scorpion venoms, exhibit inhibitory effects on different cancer cells. Indeed, some of these compounds can differentiate between healthy and cancer cells within the same tissue. During the carcinogenic process, morphological, biochemical, and biological changes occur that enable these compounds to modulate cancer but not healthy cells. This review highlights cancer cell features that enable modulation by scorpion neurotoxins. The properties of the isolated scorpion neurotoxins in cancer cells and the potential uses of these compounds as alternative treatments for cancer are discussed.
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12
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Vanoni S, Zeng C, Marella S, Uddin J, Wu D, Arora K, Ptaschinski C, Que J, Noah T, Waggoner L, Barski A, Kartashov A, Rochman M, Wen T, Martin L, Spence J, Collins M, Mukkada V, Putnam P, Naren A, Chehade M, Rothenberg ME, Hogan SP. Identification of anoctamin 1 (ANO1) as a key driver of esophageal epithelial proliferation in eosinophilic esophagitis. J Allergy Clin Immunol 2020; 145:239-254.e2. [PMID: 31647967 PMCID: PMC7366251 DOI: 10.1016/j.jaci.2019.07.049] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 07/13/2019] [Accepted: 07/29/2019] [Indexed: 12/24/2022]
Abstract
BACKGROUND The pathology of eosinophilic esophagitis (EoE) is characterized by eosinophil-rich inflammation, basal zone hyperplasia (BZH), and dilated intercellular spaces, and the underlying processes that drive the pathologic manifestations of the disease remain largely unexplored. OBJECTIVE We sought to investigate the involvement of the calcium-activated chloride channel anoctamin 1 (ANO1) in esophageal proliferation and the histopathologic features of EoE. METHODS We examined mRNA and protein expression of ANO1 in esophageal biopsy samples from patients with EoE and in mice with EoE. We performed molecular and cellular analyses and ion transport assays on an in vitro esophageal epithelial 3-dimensional model system (EPC2-ALI) and murine models of EoE to define the relationship between expression and function of ANO1 and esophageal epithelial proliferation in patients with EoE. RESULTS We observed increased ANO1 expression in esophageal biopsy samples from patients with EoE and in mice with EoE. ANO1 was expressed within the esophageal basal zone, and expression correlated positively with disease severity (eosinophils/high-power field) and BZH. Using an in vitro esophageal epithelial 3-dimensional model system revealed that ANO1 undergoes chromatin modification and rapid upregulation of expression after IL-13 stimulation, that ANO1 is the primary apical IL-13-induced Cl- transport mechanism within the esophageal epithelium, and that loss of ANO1-dependent Cl- transport abrogated esophageal epithelial proliferation. Mechanistically, ANO1-dependent regulation of basal cell proliferation was associated with modulation of TP63 expression and phosphorylated cyclin-dependent kinase 2 levels. CONCLUSIONS These data identify a functional role for ANO1 in esophageal cell proliferation and BZH in patients with EoE and provide a rationale for pharmacologic intervention of ANO1 function in patients with EoE.
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Affiliation(s)
- Simone Vanoni
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; PharmGenetix Gmbh, Niederalm-Anif, Austria
| | - Chang Zeng
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Sahiti Marella
- Mary H Weiser Food Allergy Center and Department of Pathology, Ann Arbor, Mich
| | - Jazib Uddin
- Mary H Weiser Food Allergy Center and Department of Pathology, Ann Arbor, Mich
| | - David Wu
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Kavisha Arora
- Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | | | - Jianwen Que
- Department of Medicine, Columbia University Medical Center, New York, NY
| | - Taeko Noah
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Mary H Weiser Food Allergy Center and Department of Pathology, Ann Arbor, Mich
| | - Lisa Waggoner
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Artem Barski
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Andrey Kartashov
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Mark Rochman
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Ting Wen
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Lisa Martin
- Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Jason Spence
- Departments of Biomedical Engineering, Internal Medicine and Cell and Developmental Biology, University of Michigan, Ann Arbor, Mich
| | - Margaret Collins
- Division of Pathology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Vincent Mukkada
- Division of Gastroenterology, Nutrition and Hepatology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Phillip Putnam
- Division of Gastroenterology, Nutrition and Hepatology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Anjaparavanda Naren
- Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Mirna Chehade
- Mount Sinai Center for Eosinophilic Disorders, Jaffe Food Allergy Institute, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Marc E Rothenberg
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Simon P Hogan
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Mary H Weiser Food Allergy Center and Department of Pathology, Ann Arbor, Mich.
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Abstract
As the leading cause of death in cancer, there is an urgent need to develop treatments to target the dissemination of primary tumor cells to secondary organs, known as metastasis. Bioelectric signaling has emerged in the last century as an important controller of cell growth, and with the development of current molecular tools we are now beginning to identify its role in driving cell migration and metastasis in a variety of cancer types. This review summarizes the currently available research for bioelectric signaling in solid tumor metastasis. We review the steps of metastasis and discuss how these can be controlled by bioelectric cues at the level of a cell, a population of cells, and the tissue. The role of ion channel, pump, and exchanger activity and ion flux is discussed, along with the importance of the membrane potential and the relationship between ion flux and membrane potential. We also provide an overview of the evidence for control of metastasis by external electric fields (EFs) and draw from examples in embryogenesis and regeneration to discuss the implications for endogenous EFs. By increasing our understanding of the dynamic properties of bioelectric signaling, we can develop new strategies that target metastasis to be translated into the clinic.
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Affiliation(s)
- Samantha L. Payne
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts
| | - Michael Levin
- Allen Discovery Center, Tufts University, Medford, Massachusetts
| | - Madeleine J. Oudin
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts
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14
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Hendriks AM, Schrijnders D, Kleefstra N, de Vries EGE, Bilo HJG, Jalving M, Landman GWD. Sulfonylurea derivatives and cancer, friend or foe? Eur J Pharmacol 2019; 861:172598. [PMID: 31408647 DOI: 10.1016/j.ejphar.2019.172598] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 08/07/2019] [Accepted: 08/08/2019] [Indexed: 02/07/2023]
Abstract
Type 2 diabetes mellitus (T2DM) is associated with a higher risk of cancer and cancer-related mortality. Increased blood glucose and insulin levels in T2DM patients may be, at least in part, responsible for this effect. Indeed, lowering glucose and/or insulin levels pharmacologically appears to reduce cancer risk and progression, as has been demonstrated for the biguanide metformin in observational studies. Studies investigating the influence of sulfonylurea derivatives (SUs) on cancer risk have provided conflicting results, partly due to comparisons with metformin. Furthermore, little attention has been paid to within-class differences in systemic and off-target effects of the SUs. The aim of this systematic review is to discuss the available preclinical and clinical evidence on how the different SUs influence cancer development and risk. Databases including PubMed, Cochrane, Database of Abstracts on Reviews and Effectiveness, and trial registries were systematically searched for available clinical and preclinical evidence on within-class differences of SUs and cancer risk. The overall preclinical and clinical evidence suggest that the influence of SUs on cancer risk in T2DM patients differs between the various SUs. Potential mechanisms include differing affinities for the sulfonylurea receptors and thus differential systemic insulin exposure and off-target anti-cancer effects mediated for example through potassium transporters and drug export pumps. Preclinical evidence supports potential anti-cancer effects of SUs, which are of interest for further studies and potentially repurposing of SUs. At this time, the evidence on differences in cancer risk between SUs is not strong enough to guide clinical decision making.
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Affiliation(s)
- Anne M Hendriks
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Dennis Schrijnders
- Langerhans Medical Research Group, Zwolle, the Netherlands; Diabetes Center, Isala Hospital, Zwolle, the Netherlands
| | | | - Elisabeth G E de Vries
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Henk J G Bilo
- Diabetes Center, Isala Hospital, Zwolle, the Netherlands; Department of Internal Medicine, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Mathilde Jalving
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.
| | - Gijs W D Landman
- Langerhans Medical Research Group, Zwolle, the Netherlands; Department of Internal Medicine, Gelre Hospital, Apeldoorn, the Netherlands
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15
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Sharma J, Deb B, George IA, Kapil S, Coral K, Kakkar N, Pattanaik S, Mandal AK, Mavuduru RS, Kumar P. Somatic Mutations Profile of a Young Patient With Metastatic Urothelial Carcinoma Reveals Mutations in Genes Involved in Ion Channels. Front Oncol 2019; 9:435. [PMID: 31192134 PMCID: PMC6549525 DOI: 10.3389/fonc.2019.00435] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/07/2019] [Indexed: 11/15/2022] Open
Abstract
Background: Urothelial carcinoma is the most common malignancy of the bladder and is primarily considered as a disease of the elderly. Studies that address bladder tumor occurrence in young age groups are rare. Case Presentation: A 19-year-old male presented with a gross total painless hematuria. A histology after biopsy revealed a high-grade transitional cell carcinoma with lymph node metastasis. The patient succumbed to the disease on day 72 of the treatment. Here, we used whole-exome sequencing of a paired tumor-normal sample to identify the somatic mutations and the possible targets of treatment. Result: We predicted eight potential driver mutations (TP53 p.V157L, RB1 c.1498+1G>T, MED23 p.L1127P, CTNND1 p.S713C, NSD1 p.P2212A, MED17 p.G556V, DPYD p.Q814K, and SPEN p.S1078*). In addition, we predicted deleterious mutations in genes involved in the ion channels (CACNA1S p.E1581K, CACNG1 p.P71T, CACNG8 p.G404W, GRIN2B p.A1096T, KCNC1 p.G16V, KCNH4 p.E874K, KCNK9 p.R131S, P2RX7 p.A296D, and SCN8A p.R558H). Conclusions: Most likely, mutations in genes involved in ion channels may be responsible for the aggressive behavior of a tumor. Ion channels are the second largest class of drug targets, and may thus serve as a putative potential therapeutic target in advanced stage urothelial carcinoma.
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Affiliation(s)
- Jyoti Sharma
- Institute of Bioinformatics, International Technology Park, Bangalore, India.,Manipal Academy of Higher Education (MAHE), Manipal, India
| | - Barnali Deb
- Institute of Bioinformatics, International Technology Park, Bangalore, India.,Manipal Academy of Higher Education (MAHE), Manipal, India
| | - Irene A George
- Institute of Bioinformatics, International Technology Park, Bangalore, India
| | | | | | - Nandita Kakkar
- Department of Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Smita Pattanaik
- Department of Pharmacology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Arup Kumar Mandal
- Department of Urology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Ravimohan S Mavuduru
- Department of Urology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Prashant Kumar
- Institute of Bioinformatics, International Technology Park, Bangalore, India.,Manipal Academy of Higher Education (MAHE), Manipal, India
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16
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Li AQ, Sun ZP, Liu X, Yang JS, Jin F, Zhu L, Jia WH, De Vos S, Van Stappen G, Bossier P, Yang WJ. The chloride channel cystic fibrosis transmembrane conductance regulator (CFTR) controls cellular quiescence by hyperpolarizing the cell membrane during diapause in the crustacean Artemia. J Biol Chem 2019; 294:6598-6611. [PMID: 30765604 DOI: 10.1074/jbc.ra118.005900] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 02/10/2019] [Indexed: 01/10/2023] Open
Abstract
Cellular quiescence, a reversible state in which growth, proliferation, and other cellular activities are arrested, is important for self-renewal, differentiation, development, regeneration, and stress resistance. However, the physiological mechanisms underlying cellular quiescence remain largely unknown. In the present study, we used embryos of the crustacean Artemia in the diapause stage, in which these embryos remain quiescent for prolonged periods, as a model to explore the relationship between cell-membrane potential (V mem) and quiescence. We found that V mem is hyperpolarized and that the intracellular chloride concentration is high in diapause embryos, whereas V mem is depolarized and intracellular chloride concentration is reduced in postdiapause embryos and during further embryonic development. We identified and characterized the chloride ion channel protein cystic fibrosis transmembrane conductance regulator (CFTR) of Artemia (Ar-CFTR) and found that its expression is silenced in quiescent cells of Artemia diapause embryos but remains constant in all other embryonic stages. Ar-CFTR knockdown and GlyH-101-mediated chemical inhibition of Ar-CFTR produced diapause embryos having a high V mem and intracellular chloride concentration, whereas control Artemia embryos released free-swimming nauplius larvae. Transcriptome analysis of embryos at different developmental stages revealed that proliferation, differentiation, and metabolism are suppressed in diapause embryos and restored in postdiapause embryos. Combined with RNA sequencing (RNA-Seq) of GlyH-101-treated MCF-7 breast cancer cells, these analyses revealed that CFTR inhibition down-regulates the Wnt and Aurora Kinase A (AURKA) signaling pathways and up-regulates the p53 signaling pathway. Our findings provide insight into CFTR-mediated regulation of cellular quiescence and V mem in the Artemia model.
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Affiliation(s)
- An-Qi Li
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Zhan-Peng Sun
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Xu Liu
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jin-Shu Yang
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Feng Jin
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Lin Zhu
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Wen-Huan Jia
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Stephanie De Vos
- the Laboratory of Aquaculture and Artemia Reference Center, Department of Animal Production, Ghent University, B-9000 Ghent, Belgium, and
| | - Gilbert Van Stappen
- the Laboratory of Aquaculture and Artemia Reference Center, Department of Animal Production, Ghent University, B-9000 Ghent, Belgium, and
| | - Peter Bossier
- the Laboratory of Aquaculture and Artemia Reference Center, Department of Animal Production, Ghent University, B-9000 Ghent, Belgium, and
| | - Wei-Jun Yang
- From the College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China, .,the Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China
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17
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Abstract
Modern stem cell research has mainly focused on protein expression and transcriptional networks. However, transmembrane voltage gradients generated by ion channels and transporters have demonstrated to be powerful regulators of cellular processes. These physiological cues exert influence on cell behaviors ranging from differentiation and proliferation to migration and polarity. Bioelectric signaling is a fundamental element of living systems and an untapped reservoir for new discoveries. Dissecting these mechanisms will allow for novel methods of controlling cell fate and open up new opportunities in biomedicine. This review focuses on the role of ion channels and the resting membrane potential in the proliferation and differentiation of skeletal muscle progenitor cells. In addition, findings relevant to this topic are presented and potential implications for tissue engineering and regenerative medicine are discussed.
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Affiliation(s)
- Colin Fennelly
- Department of Neuroscience, Novartis Institutes for BioMedical Research, Inc., Cambridge, Massachusetts
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, North Carolina
- Wake Forest School of Medicine, Winston-Salem, North Carolina
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18
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Cancer-Associated Intermediate Conductance Ca 2+-Activated K⁺ Channel K Ca3.1. Cancers (Basel) 2019; 11:cancers11010109. [PMID: 30658505 PMCID: PMC6357066 DOI: 10.3390/cancers11010109] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 01/10/2019] [Accepted: 01/13/2019] [Indexed: 12/14/2022] Open
Abstract
Several tumor entities have been reported to overexpress KCa3.1 potassium channels due to epigenetic, transcriptional, or post-translational modifications. By modulating membrane potential, cell volume, or Ca2+ signaling, KCa3.1 has been proposed to exert pivotal oncogenic functions in tumorigenesis, malignant progression, metastasis, and therapy resistance. Moreover, KCa3.1 is expressed by tumor-promoting stroma cells such as fibroblasts and the tumor vasculature suggesting a role of KCa3.1 in the adaptation of the tumor microenvironment. Combined, this features KCa3.1 as a candidate target for innovative anti-cancer therapy. However, immune cells also express KCa3.1 thereby contributing to T cell activation. Thus, any strategy targeting KCa3.1 in anti-cancer therapy may also modulate anti-tumor immune activity and/or immunosuppression. The present review article highlights the potential of KCa3.1 as an anti-tumor target providing an overview of the current knowledge on its function in tumor pathogenesis with emphasis on vasculo- and angiogenesis as well as anti-cancer immune responses.
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19
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Öner Ç, Çolak E, Coşan DT. Potassium channel inhibitors induce oxidative stress in breast cancer cells. ASIAN BIOMED 2018. [DOI: 10.1515/abm-2018-0004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Abstract
Background
Antioxidant levels increase to protect cell homeostasis when oxidant generation is increased by drug or inhibitor treatment. If the oxidant–antioxidant equilibrium is disrupted, oxidative stress will occur.
Objectives
To determine the effects of various potassium channel inhibitors in the disruption of oxidant–antioxidant equilibrium in breast cancer cell lines with various phenotypes.
Methods
MCF-7 or MDA-MB-231 breast cancer cells were treated with tetraethylammonium chloride (5 mM; TEA), 4-aminopyridine (5 mM; 4-AP), margatoxin (25 nM; MgTX), or astemizole (200 nM; AST). After treatment, total antioxidant, oxidant, and oxidative stress levels were determined.
Results
Incubation with TEA, 4-AP, MgTX, and AST increased oxidative stress in both MCF-7 and MDA-MB-231 cells (P < 0.001). Specific inhibitors of calcium-activated potassium channels and ether á go-go 1-related potassium channels produce greater oxidative stress than other inhibitors in MCF-7 breast cancer cells, whereas in MDA-MB-231 cells, the nonselective channel inhibitor 4-AP produces the greatest oxidative stress.
Conclusions
Potassium channel inhibitors used in our study disrupted the antioxidant–oxidant equilibrium and increased oxidative stress in the cancer cell lines. Although all of the channel inhibitors increased oxidative stress in cells, TEA and AST were the most effective inhibitors in MCF-7 cells. 4-AP was the most effective inhibitor in MDA-MB-231 cells. Voltage-gated potassium channels are attractive targets for anticancer therapy, and their inhibitors may enhance the effects of anticancer drugs.
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Affiliation(s)
- Çağri Öner
- Department of Medical Biology, Medical Faculty , Eskişehir Osmangazi University , Eskişehir , 26480 , Turkey
| | - Ertuğrul Çolak
- Department of Biostatics and Bioinformatics, Medical Faculty , Eskişehir Osmangazi University , Eskişehir 26480 , Turkey
| | - Didem Turgut Coşan
- Department of Medical Biology, Medical Faculty , Eskişehir Osmangazi University , Eskişehir , 26480 , Turkey
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20
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Potassium as a pluripotency-associated element identified through inorganic element profiling in human pluripotent stem cells. Sci Rep 2017; 7:5005. [PMID: 28694442 PMCID: PMC5504050 DOI: 10.1038/s41598-017-05117-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 05/24/2017] [Indexed: 12/20/2022] Open
Abstract
Despite their well-known function in maintaining normal cell physiology, how inorganic elements are relevant to cellular pluripotency and differentiation in human pluripotent stem cells (hPSCs) has yet to be systematically explored. Using total reflection X-ray fluorescence (TXRF) spectrometry and inductively coupled plasma mass spectrometry (ICP-MS), we analyzed the inorganic components of human cells with isogenic backgrounds in distinct states of cellular pluripotency. The elemental profiles revealed that the potassium content of human cells significantly differs when their cellular pluripotency changes. Pharmacological treatment that alters cell membrane permeability to potassium affected the maintenance and establishment of cellular pluripotency via multiple mechanisms in bona fide hPSCs and reprogrammed cells. Collectively, we report that potassium is a pluripotency-associated inorganic element in human cells and provide novel insights into the manipulation of cellular pluripotency in hPSCs by regulating intracellular potassium.
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21
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Gao R, Yang T, Xu W. Enemies or weapons in hands: investigational anti-diabetic drug glibenclamide and cancer risk. Expert Opin Investig Drugs 2017; 26:853-864. [PMID: 28541801 DOI: 10.1080/13543784.2017.1333104] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Epidemiological evidence suggests that diabetes is associated with elevated cancer risk through the actions of hyperglycemia, hyperinsulinemia and chronic inflammation. Metformin, a first-line medication for type 2 diabetes mellitus, arouses growing concerns on its anti-cancer effect. However, data regarding the effect of glibenclamide on tumor growth and cancer risk are less consistent, which may be a potential anti-cancer drug. Areas covered: In this review, we clarified probable underlying mechanisms in preclinical studies and reviewed epidemiological evidence on glibenclamide's cancer risk in clinical studies. Glibenclamide inhibited carcinogenesis through ATP-binding cassette protein super-family and ATP-sensitive potassium channels, while majority of clinical researches reported an increased or non-significant elevated cancer risk of glibenclamide users compared with metformin users. Other sulfonylureas and diarylsulfonylureas were also briefly introduced. Expert opinion: The inconsistency between the results of studies was probably ascribed to undiscovered mechanisms, confounding factors, inconsistent comparators and publication bias. Existing clinical trials were prone to be afflicted by time-related bias including immortal time bias, time-window bias, and time-lag bias. Glibenclimiade could be a promising and well-tolerated anti-neoplastic drug targeting ATP-binding cassette protein super-family and KATP channels, but its efficacy still needs to be proven in well-designed long-term randomized controlled clinical trials.
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Affiliation(s)
- Rui Gao
- a Department of Endocrinology , The First Affiliated Hospital of Nanjing Medical University, Jiangsu Province Hospital , Nanjing , China
- b Department of Hematology , The First Affiliated Hospital of Nanjing Medical University, Jiangsu Province Hospital , Nanjing , China
| | - Tao Yang
- a Department of Endocrinology , The First Affiliated Hospital of Nanjing Medical University, Jiangsu Province Hospital , Nanjing , China
| | - Wei Xu
- b Department of Hematology , The First Affiliated Hospital of Nanjing Medical University, Jiangsu Province Hospital , Nanjing , China
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22
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Kobayashi D, Kakinouchi K, Nagae T, Nagai T, Shimura K, Hazama A. Cesium reversibly suppresses HeLa cell proliferation by inhibiting cellular metabolism. FEBS Lett 2017; 591:718-727. [DOI: 10.1002/1873-3468.12579] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 01/23/2017] [Accepted: 01/24/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Daisuke Kobayashi
- Department of Cellular and Integrative Physiology School of Medicine Fukushima Medical University Japan
| | - Kei Kakinouchi
- Department of Cellular and Integrative Physiology School of Medicine Fukushima Medical University Japan
| | - Tomoki Nagae
- Department of Cellular and Integrative Physiology School of Medicine Fukushima Medical University Japan
| | - Toshihiko Nagai
- Department of Natural Sciences School of Medicine Fukushima Medical University Japan
| | - Kiyohito Shimura
- Department of Natural Sciences School of Medicine Fukushima Medical University Japan
| | - Akihiro Hazama
- Department of Cellular and Integrative Physiology School of Medicine Fukushima Medical University Japan
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23
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Durusu İZ, Hüsnügil HH, Ataş H, Biber A, Gerekçi S, Güleç EA, Özen C. Anti-cancer effect of clofazimine as a single agent and in combination with cisplatin on U266 multiple myeloma cell line. Leuk Res 2017; 55:33-40. [PMID: 28122281 DOI: 10.1016/j.leukres.2017.01.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 01/09/2017] [Indexed: 01/31/2023]
Abstract
Multiple Myeloma (MM) is a malignant neoplasm of bone marrow plasma B cells with high morbidity. Clofazimine (CLF) is an FDA-approved leprostatic, anti-tuberculosis, and anti-inflammatory drug that was previously shown to have growth suppression effect on various cancer types such as hepatocellular, lung, cervix, esophageal, colon, and breast cancer as well as melanoma, neuroblastoma, and leukemia. The objective of this study was to evaluate the anticancer effect and mechanism of CLF on U266 MM cell line. CLF (10μM, 24h) treatment resulted up to 72% growth suppression on a panel of hematological cell lines. Dose-response study conducted on U266 MM cell line revealed an IC50 value of 9.8±0.7μM. CLF also showed a synergistic inhibition effect in combination with cisplatin. In mechanistic assays, CLF treatment caused mitochondrial membrane depolarization, change in cell membrane asymmetry and increase in caspase-3 activity; indicating to an intrinsic apoptosis mechanism. This study provides new evidence for the anticancer effect of CLF on U266 cell line. Further in vivo and clinical studies are warranted to evaluate its therapeutic potential for MM treatment.
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Affiliation(s)
- İpek Z Durusu
- Middle East Technical University, Biotechnology Graduate Program, Üniversiteler Mahallesi Dumlupınar Bulvarı No:1, 06800 Çankaya Ankara, Turkey.
| | - Hazal H Hüsnügil
- Middle East Technical University, Biochemistry Graduate Program, Üniversiteler Mahallesi, Dumlupınar Bulvarı No:1, 06800 Çankaya Ankara, Turkey.
| | - Heval Ataş
- Middle East Technical University, Biotechnology Graduate Program, Üniversiteler Mahallesi Dumlupınar Bulvarı No:1, 06800 Çankaya Ankara, Turkey.
| | - Ayşenur Biber
- Middle East Technical University, Biotechnology Graduate Program, Üniversiteler Mahallesi Dumlupınar Bulvarı No:1, 06800 Çankaya Ankara, Turkey.
| | - Selin Gerekçi
- Middle East Technical University, Biochemistry Graduate Program, Üniversiteler Mahallesi, Dumlupınar Bulvarı No:1, 06800 Çankaya Ankara, Turkey.
| | - Ezgi A Güleç
- Middle East Technical University, Biochemistry Graduate Program, Üniversiteler Mahallesi, Dumlupınar Bulvarı No:1, 06800 Çankaya Ankara, Turkey.
| | - Can Özen
- Middle East Technical University, Biotechnology Department and Center of Excellence in Biomaterials and Tissue Engineering and Central Laboratory, Üniversiteler Mahallesi, Dumlupınar Bulvarı No:1, 06800 Çankaya Ankara, Turkey.
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24
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Abstract
Significant progress has been made in identifying physiologically important growth fac tors, receptors, and signal transduction pathways involved in the control of normal and malignant cell proliferation. More recent studies suggest that changes in the proliferative state of a cell are coupled to specific changes in membrane properties, which suggests that there are links between ion channel activity and cell proliferation in both neuronal and non-neuronal cells. Changes in ion channel expression may be necessary to permit cell cycle progression and, ultimately, cell proliferation. The potential mechanisms in volved in the translation of ion channel activity into changes in gene expression are discussed. NEUROSCIENTIST 5:70-73, 1999
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Zhang GM, Wan FN, Qin XJ, Cao DL, Zhang HL, Zhu Y, Dai B, Shi GH, Ye DW. Prognostic significance of the TREK-1 K2P potassium channels in prostate cancer. Oncotarget 2016; 6:18460-8. [PMID: 25962960 PMCID: PMC4621903 DOI: 10.18632/oncotarget.3782] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 04/13/2015] [Indexed: 01/09/2023] Open
Abstract
Background TREK-1 channels belong to the two-pore domain potassium channel superfamily and play an important role in central nervous system diseases. However, few studies have examined their role in carcinogenesis. Methods In this study, we assessed the expression of TREK-1 in 100 prostate cancer (PCa) tissues using immunohistochemistry and further analyzed its clinicopathological significance. Next, cell proliferation and cell cycle analysis were carried out on human PCa PC-3 cell lines where TREK-1 was stably knockdown. Results We found that compared with normal prostate tissues, PCa tissues showed overexpressed TREK-1 levels and TREK-1 levels were positively associated with Gleason score and T staging. High level of TREK-1 expression was related to shorter castration resistance free survival (CRFS). Furthermore, knockdown of TREK-1 significantly inhibited PCa cell proliferation in vitro and in vivo, and induced a G1/S cell cycle arrest. Conclusion Our results suggest that TREK-1 might be a biomarker in CRFS judgment of PCa, as well as a potential therapeutic target.
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Affiliation(s)
- Gui-Ming Zhang
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Fang-Ning Wan
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Xiao-Jian Qin
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Da-Long Cao
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Hai-Liang Zhang
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Yao Zhu
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Bo Dai
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Guo-Hai Shi
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Ding-Wei Ye
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China
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Lee JH, Park JW, Byun JK, Kim HK, Ryu PD, Lee SY, Kim DY. Silencing of voltage-gated potassium channel KV9.3 inhibits proliferation in human colon and lung carcinoma cells. Oncotarget 2016; 6:8132-43. [PMID: 25924237 PMCID: PMC4480740 DOI: 10.18632/oncotarget.3517] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 02/03/2015] [Indexed: 01/12/2023] Open
Abstract
Voltage-gated potassium (Kv) channels are known to be involved in cancer development and cancer cell proliferation. KV9.3, an electronically silent subunit, forms heterotetramers with KV2.1 in excitable cells and modulates its electrophysiological properties. However, the role of KV9.3 alone in non-excitable cancer cells has not been studied. Here, we evaluated the effect of silencing KV9.3 on cancer cell proliferation in HCT15 colon carcinoma cells and A549 lung adenocarcinoma cells. We confirmed the expression of KV9.3 mRNA in HCT15 and A549 cells and showed that silencing KV9.3 using small interfering RNA caused G0/G1 cell cycle arrest and alterations in cell cycle regulatory proteins in both HCT15 and A549 cells without affecting apoptosis. Also, stable knockdown of KV9.3 expression using short-hairpin RNA inhibited tumor growth in SCID mouse xenograft model. Using a bioinformatics approach, we identified Sp1 binding sites in the promoter region of the gene encoding KV9.3. We further found that Sp1 bound to this region and showed that the Sp1 inhibitor, mithramycin A, induced a concentration-dependent decrease in KV9.3 expression. Taken together, these data suggest that knockdown of KV9.3 inhibits proliferation in colon carcinoma and lung adenocarcinoma cell lines and may be regulated by Sp1.
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Affiliation(s)
- Jeong-Ha Lee
- Laboratory of Veterinary Pathology, Seoul National University, Seoul, Korea
| | - Jun-Won Park
- Biomolecular Function Research Branch, National Cancer Center, Goyang, Gyeonggi, Korea
| | - Jun Kyu Byun
- Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea
| | - Hark Kyun Kim
- Biomolecular Function Research Branch, National Cancer Center, Goyang, Gyeonggi, Korea
| | - Pan Dong Ryu
- Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea
| | - So Yeong Lee
- Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea
| | - Dae-Yong Kim
- Laboratory of Veterinary Pathology, Seoul National University, Seoul, Korea
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Cookson VJ, Waite SL, Heath PR, Hurd PJ, Gandhi SV, Chapman NR. Binding loci of RelA-containing nuclear factor-kappaB dimers in promoter regions of PHM1-31 myometrial smooth muscle cells. Mol Hum Reprod 2015; 21:865-83. [DOI: 10.1093/molehr/gav051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 09/03/2015] [Indexed: 12/15/2022] Open
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Abstract
This review compares the biological and physiological function of Sigma receptors [σRs] and their potential therapeutic roles. Sigma receptors are widespread in the central nervous system and across multiple peripheral tissues. σRs consist of sigma receptor one (σ1R) and sigma receptor two (σ2R) and are expressed in numerous regions of the brain. The sigma receptor was originally proposed as a subtype of opioid receptors and was suggested to contribute to the delusions and psychoses induced by benzomorphans such as SKF-10047 and pentazocine. Later studies confirmed that σRs are non-opioid receptors (not an µ opioid receptor) and play a more diverse role in intracellular signaling, apoptosis and metabolic regulation. σ1Rs are intracellular receptors acting as chaperone proteins that modulate Ca2+ signaling through the IP3 receptor. They dynamically translocate inside cells, hence are transmembrane proteins. The σ1R receptor, at the mitochondrial-associated endoplasmic reticulum membrane, is responsible for mitochondrial metabolic regulation and promotes mitochondrial energy depletion and apoptosis. Studies have demonstrated that they play a role as a modulator of ion channels (K+ channels; N-methyl-d-aspartate receptors [NMDAR]; inositol 1,3,5 triphosphate receptors) and regulate lipid transport and metabolism, neuritogenesis, cellular differentiation and myelination in the brain. σ1R modulation of Ca2+ release, modulation of cardiac myocyte contractility and may have links to G-proteins. It has been proposed that σ1Rs are intracellular signal transduction amplifiers. This review of the literature examines the mechanism of action of the σRs, their interaction with neurotransmitters, pharmacology, location and adverse effects mediated through them.
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Affiliation(s)
- Colin G Rousseaux
- a Department of Pathology and Laboratory Medicine , University of Ottawa , Ottawa , ON , Canada and
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Rao VR, Perez-Neut M, Kaja S, Gentile S. Voltage-gated ion channels in cancer cell proliferation. Cancers (Basel) 2015; 7:849-75. [PMID: 26010603 PMCID: PMC4491688 DOI: 10.3390/cancers7020813] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 05/12/2015] [Indexed: 12/22/2022] Open
Abstract
Changes of the electrical charges across the surface cell membrane are absolutely necessary to maintain cellular homeostasis in physiological as well as in pathological conditions. The opening of ion channels alter the charge distribution across the surface membrane as they allow the diffusion of ions such as K+, Ca++, Cl.
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Affiliation(s)
- Vidhya R Rao
- Department of Molecular Pharmacology and Therapeutics, Loyola University Chicago 2160 S. 1s tAve, Maywood, IL 60153, USA.
| | - Mathew Perez-Neut
- Department of Molecular Pharmacology and Therapeutics, Loyola University Chicago 2160 S. 1s tAve, Maywood, IL 60153, USA.
| | - Simon Kaja
- Department of Ophthalmology and Vision Research Center, School of Medicine, University of Missouri-Kansas City, 2411 Holmes St., Kansas City, MO 64108, USA.
| | - Saverio Gentile
- Department of Molecular Pharmacology and Therapeutics, Loyola University Chicago 2160 S. 1s tAve, Maywood, IL 60153, USA.
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Kale VP, Amin SG, Pandey MK. Targeting ion channels for cancer therapy by repurposing the approved drugs. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2747-55. [PMID: 25843679 DOI: 10.1016/j.bbamem.2015.03.034] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 03/18/2015] [Accepted: 03/27/2015] [Indexed: 12/21/2022]
Abstract
Ion channels have been shown to be involved in oncogenesis and efforts are being poured in to target the ion channels. There are many clinically approved drugs with ion channels as "off" targets. The question is, can these drugs be repurposed to inhibit ion channels for cancer treatment? Repurposing of drugs will not only save investors' money but also result in safer drugs for cancer patients. Advanced bioinformatics techniques and availability of a plethora of open access data on FDA approved drugs for various indications and omics data of large number of cancer types give a ray of hope to look for possibility of repurposing those drugs for cancer treatment. This article is part of a Special Issue entitled: Membrane channels and transporters in cancers.
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Affiliation(s)
- Vijay Pralhad Kale
- Department of Pharmacology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Shantu G Amin
- Department of Pharmacology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Manoj K Pandey
- Department of Pharmacology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA.
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Sun T, Song ZG, Jiang DQ, Nie HG, Han DY. Docetaxel Modulates the Delayed Rectifier Potassium Current (I K) and ATP-Sensitive Potassium Current (I KATP) in Human Breast Cancer Cells. J Membr Biol 2014; 248:197-204. [DOI: 10.1007/s00232-014-9757-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Accepted: 07/25/2014] [Indexed: 10/24/2022]
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Venglovecz V, Rakonczay Z, Gray MA, Hegyi P. Potassium channels in pancreatic duct epithelial cells: their role, function and pathophysiological relevance. Pflugers Arch 2014; 467:625-40. [PMID: 25074489 DOI: 10.1007/s00424-014-1585-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 07/09/2014] [Accepted: 07/18/2014] [Indexed: 12/14/2022]
Abstract
Pancreatic ductal epithelial cells play a fundamental role in HCO3 (-) secretion, a process which is essential for maintaining the integrity of the pancreas. Although several studies have implicated impaired HCO3 (-) and fluid secretion as a triggering factor in the development of pancreatitis, the mechanism and regulation of HCO3 (-) secretion is still not completely understood. To date, most studies on the ion transporters that orchestrate ductal HCO3 (-) secretion have focussed on the role of Cl(-)/HCO3 (-) exchangers and Cl(-) channels, whereas much less is known about the role of K(+) channels. However, there is growing evidence that many types of K(+) channels are present in ductal cells where they have an essential role in establishing and maintaining the electrochemical driving force for anion secretion. For this reason, strategies that increase K(+) channel function may help to restore impaired HCO3 (-) and fluid secretion, such as in pancreatitis, and therefore provide novel directions for future pancreatic therapy. In this review, our aims are to summarize the types of K(+) channels found in pancreatic ductal cells and to discuss their individual roles in ductal HCO3 (-) secretion. We will also describe how K(+) channels are involved in pathophysiological conditions and discuss how they could act as new molecular targets for the development of therapeutic approaches to treat pancreatic diseases.
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Affiliation(s)
- Viktória Venglovecz
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged, Hungary,
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Effects of voltage-gated K+ channel on cell proliferation in multiple myeloma. ScientificWorldJournal 2014; 2014:785140. [PMID: 24995361 PMCID: PMC4068034 DOI: 10.1155/2014/785140] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 05/12/2014] [Accepted: 05/12/2014] [Indexed: 12/21/2022] Open
Abstract
Objective. To study the effects and underlying mechanisms of voltage-gated K+ channels on the proliferation of multiple myeloma cells. Methods. RPMI-8226 MM cell line was used for the experiments. Voltage-gated K+ currents and the resting potential were recorded by whole-cell patch-clamp technique. RT-PCR detected Kv channel mRNA expression. Cell viability was analyzed with MTT assay. Cell counting system was employed to monitor cell proliferation. DNA contents and cell volume were analyzed by flow cytometry. Results. Currents recorded in RPMI-8226 cells were confirmed to be voltage-gated K+ channels. A high level of Kv1.3 mRNA was detected but no Kv3.1 mRNA was detected in RPMI-8226 cells. Voltage-gated K+ channel blocker 4-aminopyridine (4-AP) (2 mM) depolarized the resting potential from −42 ± 1.7 mV to −31.8 ± 2.8 mV (P < 0.01). The results of MTT assay showed that there was no significant cytotoxicity to RPMI-8226 cells when the 4-AP concentration was lower than 4 mM. 4-AP arrested cell cycle in G0/G1 phase. Cells were synchronized at the G1/S boundary by treatment of aphidicolin and released from the blockage by replacing the medium with normal culture medium or with culture medium containing 2 mM 4-AP. 4-AP produced no significant inhibitory effect on cell cycle compared with control cells (P > 0.05). Conclusions. In RPMI-8226, voltage-gated K+ channels are involved in proliferation and cell cycle progression its influence on the resting potential and cell volume may be responsible for this process; the inhibitory effect of the voltage-gated K+ channel blocker on RPMI-8226 cell proliferation is a phase-specific event.
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Girault A, Privé A, Trinh NTN, Bardou O, Ferraro P, Joubert P, Bertrand R, Brochiero E. Identification of KvLQT1 K+ channels as new regulators of non-small cell lung cancer cell proliferation and migration. Int J Oncol 2013; 44:838-48. [PMID: 24366043 DOI: 10.3892/ijo.2013.2228] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Accepted: 11/25/2013] [Indexed: 11/05/2022] Open
Abstract
K+ channels, which are overexpressed in several cancers, have been identified as regulators of cell proliferation and migration, key processes in cancer development/propagation. Their role in lung cancer has not been studied extensively; but we showed previously that KvLQT1 channels are involved in cell migration, proliferation and repair of normal lung epithelial cells. We now investigated the role of these channels in lung cancer cell lines and their expression levels in human lung adenocarcinoma (AD) tissues. First, we observed that the wound-healing rates of A549 lung adenocarcinoma cell monolayers were reduced by clofilium and chromanol or after silencing with KvLQT1-specific siRNA. Dose-dependent decrease of A549 cell growth and cell accumulation in G0/G1 phase were seen after KvLQT1 inhibition. Clofilium also affected 2D and 3D migration of A549 cells. Similarly, H460 cell growth, migration and wound healing were diminished by this drug. Because K+ channel overexpression has been encountered in some cancers, we assessed KvLQT1 expression levels in tumor tissues from patients with lung AD. KvLQT1 protein expression in tumor samples was increased by 1.5- to 7-fold, compared to paired non-neoplastic tissues, in 17 of 26 patients. In summary, our data reveal that KvLQT1 channel blockade efficiently reduces A549 and H460 cell proliferation and migration. Moreover, KvLQT1 overexpression in AD samples suggests that it could be a potential therapeutic target in lung cancer.
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Affiliation(s)
- Alban Girault
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
| | - Anik Privé
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
| | - Nguyen Thu Ngan Trinh
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
| | - Olivier Bardou
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
| | - Pasquale Ferraro
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
| | | | - Richard Bertrand
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
| | - Emmanuelle Brochiero
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec H2X 0A9, Canada
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Park KS, Han MH, Jang HK, Kim KA, Cha EJ, Kim WJ, Choi YH, Kim Y. The TREK2 Channel Is Involved in the Proliferation of 253J Cell, a Human Bladder Carcinoma Cell. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2013; 17:511-6. [PMID: 24381500 PMCID: PMC3874438 DOI: 10.4196/kjpp.2013.17.6.511] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 11/11/2013] [Accepted: 11/19/2013] [Indexed: 11/17/2022]
Abstract
Bladder cancer is the seventh most common cancer in men that smoke, and the incidence of disease increases with age. The mechanism of occurrence has not yet been established. Potassium channels have been linked with cell proliferation. Some two-pore domain K+ channels (K2P), such as TASK3 and TREK1, have recently been shown to be overexpressed in cancer cells. Here we focused on the relationship between cell growth and the mechanosensitive K2P channel, TREK2, in the human bladder cancer cell line, 253J. We confirmed that TREK2 was expressed in bladder cancer cell lines by Western blot and quantitative real-time PCR. Using the patch-clamp technique, the mechanosensitive TREK2 channel was recorded in the presence of symmetrical 150 mM KCl solutions. In 253J cells, the TREK2 channel was activated by polyunsaturated fatty acids, intracellular acidosis at -60 mV and mechanical stretch at -40 mV or 40 mV. Furthermore, small interfering RNA (siRNA)-mediated TREK2 knockdown resulted in a slight depolarization from -19.9 mV±0.8 (n=116) to -8.5 mV±1.4 (n=74) and decreased proliferation of 253J cells, compared to negative control siRNA. 253J cells treated with TREK2 siRNA showed a significant increase in the expression of cell cycle boundary proteins p21 and p53 and also a remarkable decrease in protein expression of cyclins D1 and D3. Taken together, the TREK2 channel is present in bladder cancer cell lines and may, at least in part, contribute to cell cycle-dependent growth.
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Affiliation(s)
- Kyung-Sun Park
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Min Ho Han
- Department of Biochemistry, Dongeui University College of Oriental Medicine, Busan 614-714, Korea. ; Personalized Tumor Engineering Research Center, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
| | - Hee Kyung Jang
- Department of Physiology, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea. ; Personalized Tumor Engineering Research Center, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
| | - Kyung-A Kim
- Department of Biomedical Engineering, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea. ; Personalized Tumor Engineering Research Center, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
| | - Eun-Jong Cha
- Department of Urology, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea. ; Personalized Tumor Engineering Research Center, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
| | - Wun-Jae Kim
- Department of Urology, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea. ; Personalized Tumor Engineering Research Center, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
| | - Yung Hyun Choi
- Department of Biochemistry, Dongeui University College of Oriental Medicine, Busan 614-714, Korea. ; Personalized Tumor Engineering Research Center, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
| | - Yangmi Kim
- Department of Physiology, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea. ; Personalized Tumor Engineering Research Center, College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
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Pasello G, Urso L, Conte P, Favaretto A. Effects of sulfonylureas on tumor growth: a review of the literature. Oncologist 2013; 18:1118-25. [PMID: 24043597 DOI: 10.1634/theoncologist.2013-0177] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Type 2 diabetes mellitus patients are at higher cancer risk, probably because of hyperinsulinemia and insulin growth factor 1 pathway activation. The effects of antidiabetic drugs on cancer risk have been described and discussed in several studies suggesting opposite effects of the biguanide metformin and sulfonylureas on cancer incidence and mortality. The anticancer mechanisms of metformin have been clarified, and some clinical studies, particularly in breast cancer patients, have been published or are currently ongoing; however, data about the effects of sulfonylureas on cancer growth are less consistent. The aims of this work are to review preclinical evidence of second-generation sulfonylureas effects on tumor growth, to clarify the potential mechanisms of action, and to identify possible metabolic targets for patient selection. Most evidence is on the adenosine triphosphate-sensitive potassium channels inhibitor glibenclamide, which interacts with reactive oxygen species production thus inducing cancer cell death. Among diarylsulfonylureas, next-generation DW2282 derivatives are particularly promising because of the proapoptotic activity in multidrug-resistant cells.
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Affiliation(s)
- Giulia Pasello
- Second Medical Oncology Unit, Istituto Oncologico Veneto, Padua, Italy
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Yang M, Brackenbury WJ. Membrane potential and cancer progression. Front Physiol 2013; 4:185. [PMID: 23882223 PMCID: PMC3713347 DOI: 10.3389/fphys.2013.00185] [Citation(s) in RCA: 362] [Impact Index Per Article: 32.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 06/28/2013] [Indexed: 12/27/2022] Open
Abstract
Membrane potential (Vm), the voltage across the plasma membrane, arises because of the presence of different ion channels/transporters with specific ion selectivity and permeability. Vm is a key biophysical signal in non-excitable cells, modulating important cellular activities, such as proliferation and differentiation. Therefore, the multiplicities of various ion channels/transporters expressed on different cells are finely tuned in order to regulate the Vm. It is well-established that cancer cells possess distinct bioelectrical properties. Notably, electrophysiological analyses in many cancer cell types have revealed a depolarized Vm that favors cell proliferation. Ion channels/transporters control cell volume and migration, and emerging data also suggest that the level of Vm has functional roles in cancer cell migration. In addition, hyperpolarization is necessary for stem cell differentiation. For example, both osteogenesis and adipogenesis are hindered in human mesenchymal stem cells (hMSCs) under depolarizing conditions. Therefore, in the context of cancer, membrane depolarization might be important for the emergence and maintenance of cancer stem cells (CSCs), giving rise to sustained tumor growth. This review aims to provide a broad understanding of the Vm as a bioelectrical signal in cancer cells by examining several key types of ion channels that contribute to its regulation. The mechanisms by which Vm regulates cancer cell proliferation, migration, and differentiation will be discussed. In the long term, Vm might be a valuable clinical marker for tumor detection with prognostic value, and could even be artificially modified in order to inhibit tumor growth and metastasis.
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Affiliation(s)
- Ming Yang
- Department of Biology, University of York York, UK
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Khanfar MA, AbuKhader MM, Alqtaishat S, Taha MO. Pharmacophore modeling, homology modeling, and in silico screening reveal mammalian target of rapamycin inhibitory activities for sotalol, glyburide, metipranolol, sulfamethizole, glipizide, and pioglitazone. J Mol Graph Model 2013; 42:39-49. [PMID: 23545333 DOI: 10.1016/j.jmgm.2013.02.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 02/21/2013] [Accepted: 02/24/2013] [Indexed: 12/18/2022]
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Expression and effects of modulation of the K2P potassium channels TREK-1 (KCNK2) and TREK-2 (KCNK10) in the normal human ovary and epithelial ovarian cancer. Clin Transl Oncol 2013; 15:910-8. [DOI: 10.1007/s12094-013-1022-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Accepted: 02/12/2013] [Indexed: 01/20/2023]
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Núñez M, Medina V, Cricco G, Croci M, Cocca C, Rivera E, Bergoc R, Martín G. Glibenclamide inhibits cell growth by inducing G0/G1 arrest in the human breast cancer cell line MDA-MB-231. BMC Pharmacol Toxicol 2013; 14:6. [PMID: 23311706 PMCID: PMC3558386 DOI: 10.1186/2050-6511-14-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2012] [Accepted: 01/07/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Glibenclamide (Gli) binds to the sulphonylurea receptor (SUR) that is a regulatory subunit of ATP-sensitive potassium channels (KATP channels). Binding of Gli to SUR produces the closure of KATP channels and the inhibition of their activity. This drug is widely used for treatment of type 2-diabetes and it has been signaled as antiproliferative in several tumor cell lines. In previous experiments we demonstrated the antitumoral effect of Gli in mammary tumors induced in rats. The aim of the present work was to investigate the effect of Gli on MDA-MB-231 breast cancer cell proliferation and to examine the possible pathways involved in this action. RESULTS The mRNA expression of the different subunits that compose the KATP channels was evaluated in MDA-MB-231 cells by reverse transcriptase-polymerase chain reaction. Results showed the expression of mRNA for both pore-forming isoforms Kir6.1 and Kir6.2 and for the regulatory isoform SUR2B in this cell line. Gli inhibited cell proliferation assessed by a clonogenic method in a dose dependent manner, with an increment in the population doubling time. The KATP channel opener minoxidil increased clonogenic proliferation, effect that was counteracted by Gli. When cell cycle analysis was performed by flow cytometry, Gli induced a significant cell-cycle arrest in G0/G1 phase, together with an up-regulation of p27 levels and a diminution in cyclin E expression, both evaluated by immunoblot. However, neither differentiation evaluated by neutral lipid accumulation nor apoptosis assessed by different methodologies were detected. The cytostatic, non toxic effect on cell proliferation was confirmed by removal of the drug.Combination treatment of Gli with tamoxifen or doxorubicin showed an increment in the antiproliferative effect only for doxorubicin. CONCLUSIONS Our data clearly demonstrated a cytostatic effect of Gli in MDA-MB-231 cells that may be mediated through KATP channels, associated to the inhibition of the G1-S phase progression. In addition, an interesting observation about the effect of the combination of Gli with doxorubicin leads to future research for a potential novel role for Gli as an adjuvant in breast cancer treatment.
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Affiliation(s)
- Mariel Núñez
- Radioisotopes Laboratory, School of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina
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Rodríguez-Gómez JA, Levitsky KL, López-Barneo J. T-type Ca2+ channels in mouse embryonic stem cells: modulation during cell cycle and contribution to self-renewal. Am J Physiol Cell Physiol 2011; 302:C494-504. [PMID: 22049210 DOI: 10.1152/ajpcell.00267.2011] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Ion channels participate in cell homeostasis and are involved in the regulation of proliferation and differentiation in several cell types; however, their presence and function in embryonic stem (ES) cells are poorly studied. We have investigated the existence of voltage-dependent inward currents in mouse ES cells and their ability to modulate proliferation and self-renewal. Patch-clamped ES cells had inactivating tetrodotoxin (TTX)-sensitive Na(+) currents as well as transient Ca(2+) currents abolished by the external application of Ni(2+). Biophysical and pharmacological data indicated that the Ca(2+) current is predominantly mediated by T-type (Ca(v)3.2) channels. The number of cells expressing T-type channels and Ca(v)3.2 mRNA levels increased at the G1/S transition of the cell cycle. TTX had no effect on ES cell proliferation. However, blockade of T-type Ca(2+) currents with Ni(2+) induced a decrease in proliferation and alkaline phosphatase positive colonies as well as reduced expression of Oct3/4 and Nanog, all indicative of loss in self-renewal capacity. Decreased alkaline phosphatase and Oct3/4 expression were also observed in cells subjected to small interfering RNA-induced knockdown for T-type (Ca(v)3.2) Ca(2+) channels, thus partially recapitulating the pharmacological effects on self-renewal. These results indicate that Ca(v)3.2 channel expression in ES cells is modulated along the cell cycle being induced at late G1 phase. They also suggest that these channels are involved in the maintenance of the undifferentiated state of mouse ES cells. We propose that Ca(2+) entry mediated by Ca(v)3.2 channels might be one of the intracellular signals that participate in the complex network responsible for ES cell self-renewal.
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Affiliation(s)
- José A Rodríguez-Gómez
- Instituto de Biomedicina de Sevilla, Campus Hospital Universitario Virgen del Rocío, Seville, Spain
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42
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Abstract
Ion channels are involved in a variety of tumors. In particular, potassium channels are expressed abnormally in many cancer types, where their pharmacologic manipulation impairs tumor progression. Since this group of molecules has been successfully targeted for decades in other therapeutic areas, there is a significant body of knowledge on the pharmacology of potassium channels. Several groups of potassium channels with defined molecular identities have been proposed as candidates for therapeutic intervention. The strategies put forward range from classical small molecule blockade to gene therapy approaches, and include the use of potassium channels as targets for adjuvant therapy. We will discuss the reasons for these proposals and explore possible future developments.
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43
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Bittner S, Budde T, Wiendl H, Meuth SG. From the background to the spotlight: TASK channels in pathological conditions. Brain Pathol 2010; 20:999-1009. [PMID: 20529081 PMCID: PMC8094868 DOI: 10.1111/j.1750-3639.2010.00407.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Accepted: 04/13/2010] [Indexed: 01/10/2023] Open
Abstract
TWIK-related acid-sensitive potassium channels (TASK1-3) belong to the family of two-pore domain (K(2P) ) potassium channels. Emerging knowledge about an involvement of TASK channels in cancer development, inflammation, ischemia and epilepsy puts the spotlight on a leading role of TASK channels under these conditions. TASK3 has been especially linked to cancer development. The pro-oncogenic potential of TASK3 could be shown in cell lines and in various tumor entities. Pathophysiological hallmarks in solid tumors (e.g. low pH and oxygen deprivation) regulate TASK3 channels. These conditions can also be found in (autoimmune) inflammation. Inhibition of TASK1,2,3 leads to a reduction of T cell effector function. It could be demonstrated that TASK1(-/-) mice are protected from experimental autoimmune inflammation while the same animals display increased infarct volumes after cerebral ischemia. Furthermore, TASK channels have both an anti-epileptic as well as a pro-epileptic potential. The relative contribution of these opposing influences depends on their cell type-specific expression and the conditions of the cellular environment. This indicates that TASK channels are per se neither protective nor detrimental but their functional impact depends on the "pathophysiological" scenario. Based on these findings TASK channels have evolved from "mere background" channels to key modulators in pathophysiological conditions.
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Affiliation(s)
- Stefan Bittner
- Department of Neurology, University of Wuerzburg, Wuerzburg, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfaelische Wilhelms‐University Muenster, Muenster, Germany
| | - Heinz Wiendl
- Department of Neurology—Inflammatory disorders of the nervous system and neurooncology, University of Muenster, Muenster, Germany
| | - Sven G. Meuth
- Department of Neurology, University of Wuerzburg, Wuerzburg, Germany
- Department of Neurology—Inflammatory disorders of the nervous system and neurooncology, University of Muenster, Muenster, Germany
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44
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Mathie A, Rees KA, El Hachmane MF, Veale EL. Trafficking of neuronal two pore domain potassium channels. Curr Neuropharmacol 2010; 8:276-86. [PMID: 21358977 PMCID: PMC3001220 DOI: 10.2174/157015910792246146] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Revised: 01/18/2010] [Accepted: 01/18/2010] [Indexed: 01/05/2023] Open
Abstract
The activity of two pore domain potassium (K2P) channels regulates neuronal excitability and cell firing. Post-translational regulation of K2P channel trafficking to the membrane controls the number of functional channels at the neuronal membrane affecting the functional properties of neurons. In this review, we describe the general features of K channel trafficking from the endoplasmic reticulum (ER) to the plasma membrane via the Golgi apparatus then focus on established regulatory mechanisms for K2P channel trafficking. We describe the regulation of trafficking of TASK channels from the ER or their retention within the ER and consider the competing hypotheses for the roles of the chaperone proteins 14-3-3, COP1 and p11 in these processes and where these proteins bind to TASK channels. We also describe the localisation of TREK channels to particular regions of the neuronal membrane and the involvement of the TREK channel binding partners AKAP150 and Mtap2 in this localisation. We describe the roles of other K2P channel binding partners including Arf6, EFA6 and SUMO for TWIK1 channels and Vpu for TASK1 channels. Finally, we consider the potential importance of K2P channel trafficking in a number of disease states such as neuropathic pain and cancer and the protection of neurons from ischemic damage. We suggest that a better understanding of the mechanisms and regulations that underpin the trafficking of K2P channels to the plasma membrane and to localised regions therein may considerably enhance the probability of future therapeutic advances in these areas.
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Affiliation(s)
- Alistair Mathie
- Medway School of Pharmacy, Universities of Kent and Greenwich at Medway, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK
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45
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Calcium-activated potassium channels BK and IK1 are functionally expressed in human gliomas but do not regulate cell proliferation. PLoS One 2010; 5:e12304. [PMID: 20808839 PMCID: PMC2924897 DOI: 10.1371/journal.pone.0012304] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Accepted: 07/25/2010] [Indexed: 01/15/2023] Open
Abstract
Gliomas are morbid brain tumors that are extremely resistant to available chemotherapy and radiology treatments. Some studies have suggested that calcium-activated potassium channels contribute to the high proliferative potential of tumor cells, including gliomas. However, other publications demonstrated no role for these channels or even assigned them antitumorogenic properties. In this work we characterized the expression and functional contribution to proliferation of Ca2+-activated K+ channels in human glioblastoma cells. Quantitative RT-PCR detected transcripts for the big conductance (BK), intermediate conductance (IK1), and small conductance (SK2) K+ channels in two glioblastoma-derived cell lines and a surgical sample of glioblastoma multiforme. Functional expression of BK and IK1 in U251 and U87 glioma cell lines and primary glioma cultures was verified using whole-cell electrophysiological recordings. Inhibitors of BK (paxilline and penitrem A) and IK1 channels (clotrimazole and TRAM-34) reduced U251 and U87 proliferation in an additive fashion, while the selective blocker of SK channels UCL1848 had no effect. However, the antiproliferative properties of BK and IK1 inhibitors were seen at concentrations that were higher than those necessary to inhibit channel activity. To verify specificity of pharmacological agents, we downregulated BK and IK1 channels in U251 cells using gene-specific siRNAs. Although siRNA knockdowns caused strong reductions in the BK and IK1 current densities, neither single nor double gene silencing significantly affected rates of proliferation. Taken together, these results suggest that Ca2+-activated K+ channels do not play a critical role in proliferation of glioma cells and that the effects of pharmacological inhibitors occur through their off-target actions.
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Blackiston DJ, McLaughlin KA, Levin M. Bioelectric controls of cell proliferation: ion channels, membrane voltage and the cell cycle. Cell Cycle 2009; 8:3527-36. [PMID: 19823012 DOI: 10.4161/cc.8.21.9888] [Citation(s) in RCA: 299] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
All cells possess long-term, steady-state voltage gradients across the plasma membrane. These transmembrane potentials arise from the combined activity of numerous ion channels, pumps and gap junction complexes. Increasing data from molecular physiology now reveal that the role of changes in membrane voltage controls, and is in turn controlled by, progression through the cell cycle. We review recent functional data on the regulation of mitosis by bioelectric signals, and the function of membrane voltage and specific potassium, sodium and chloride ion channels in the proliferation of embryonic, somatic and neoplastic cells. Its unique properties place this powerful, well-conserved, but still poorly-understood signaling system at the center of the coordinated cellular interactions required for complex pattern formation. Moreover, disregulation of ion channel expression and function is increasingly observed to be not only a useful marker but likely a functional element in oncogenesis. New advances in genomics and the development of in vivo biophysical techniques suggest exciting opportunities for molecular medicine, bioengineering and regenerative approaches to human health.
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Affiliation(s)
- Douglas J Blackiston
- Biology Department, and Center for Regenerative and Developmental Biology, Tufts University, Medford, MA, USA
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47
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Solomon VR, Lee H. Chloroquine and its analogs: a new promise of an old drug for effective and safe cancer therapies. Eur J Pharmacol 2009; 625:220-33. [PMID: 19836374 DOI: 10.1016/j.ejphar.2009.06.063] [Citation(s) in RCA: 383] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2009] [Revised: 06/12/2009] [Accepted: 06/22/2009] [Indexed: 02/03/2023]
Abstract
Chloroquine (CQ), N'-(7-chloroquinolin-4-yl)-N,N-diethyl-pentane-1,4-diamine, is widely used as an effective and safe anti-malarial and anti-rheumatoid agent. CQ was discovered 1934 as "Resochin" by Andersag and co-workers at the Bayer laboratories. Ironically, CQ was initially ignored for a decade because it was considered too toxic to use in humans. CQ was "re-discovered" during World War II in the United States in the course of anti-malarial drug development. The US government-sponsored clinical trials during this period showed unequivocally that CQ has a significant therapeutic value as an anti-malarial drug. Consequently, CQ was introduced into clinical practice in 1947 for the prophylaxis treatment of malaria (Plasmodium vivax, ovale and malariae). CQ still remains the drug of choice for malaria chemotherapy because it is highly effective and well tolerated by humans. In addition, CQ is widely used as an anti-inflammatory agent for the treatment of rheumatoid arthritis, lupus erythematosus and amoebic hepatitis. More recently, CQ has been studied for its potential as an enhancing agent in cancer therapies. Accumulating lines of evidence now suggest that CQ can effectively sensitize cell-killing effects by ionizing radiation and chemotherapeutic agents in a cancer-specific manner. The lysosomotrophic property of CQ appears to be important for the increase in efficacy and specificity. Although more studies are needed, CQ may be one of the most effective and safe sensitizers for cancer therapies. Taken together, it appears that the efficacy of conventional cancer therapies can be dramatically enhanced if used in combination with CQ and its analogs.
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Affiliation(s)
- V Raja Solomon
- Tumor Biology Group, Northeastern Ontario Regional Cancer Program at the Sudbury Regional Hospital, 41 Ramsey Lake Road, Sudbury, Ontario, Canada P3E 5J1
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48
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Sundelacruz S, Levin M, Kaplan DL. Role of membrane potential in the regulation of cell proliferation and differentiation. Stem Cell Rev Rep 2009; 5:231-46. [PMID: 19562527 PMCID: PMC10467564 DOI: 10.1007/s12015-009-9080-2] [Citation(s) in RCA: 329] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Accepted: 06/07/2009] [Indexed: 12/11/2022]
Abstract
Biophysical signaling, an integral regulator of long-term cell behavior in both excitable and non-excitable cell types, offers enormous potential for modulation of important cell functions. Of particular interest to current regenerative medicine efforts, we review several examples that support the functional role of transmembrane potential (V(mem)) in the regulation of proliferation and differentiation. Interestingly, distinct V(mem) controls are found in many cancer cell and precursor cell systems, which are known for their proliferative and differentiation capacities, respectively. Collectively, the data demonstrate that bioelectric properties can serve as markers for cell characterization and can control cell mitotic activity, cell cycle progression, and differentiation. The ability to control cell functions by modulating bioelectric properties such as V(mem) would be an invaluable tool for directing stem cell behavior toward therapeutic goals. Biophysical properties of stem cells have only recently begun to be studied and are thus in need of further characterization. Understanding the molecular and mechanistic basis of biophysical regulation will point the way toward novel ways to rationally direct cell functions, allowing us to capitalize upon the potential of biophysical signaling for regenerative medicine and tissue engineering.
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Affiliation(s)
- Sarah Sundelacruz
- Department of Biomedical Engineering, Tufts University, 4 Colby St., Medford, MA 02155, USA
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49
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Varghese M, Olstorn H, Sandberg C, Vik-Mo EO, Noordhuis P, Nistér M, Berg-Johnsen J, Moe MC, Langmoen IA. A comparison between stem cells from the adult human brain and from brain tumors. Neurosurgery 2009; 63:1022-33; discussion 1033-4. [PMID: 19057315 DOI: 10.1227/01.neu.0000335792.85142.b0] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE To directly compare stem cells from the normal adult human brain (adult human neural stem cells [AHNSC]), Grade II astrocytomas (AC II), and glioblastoma multiforme (GBM), with respect to proliferative and tumor-forming capacity and differentiation potential. METHODS Cells were isolated from tissue obtained during epilepsy surgery (AHNSCs) or tumor surgery (glioma stem cells [GSC]). They were cultured and investigated in vitro or after transplantation in immunodeficient mice. RESULTS Under identical experimental conditions, the following were found: 1) GBM stem cells formed tumors after orthotopic transplantation; AHNSCs showed no sign of tumor formation; 2) GSCs showed a significantly higher growth rate and self-renewal capacity; 3) both the growth rate and telomerase expression were high in GSCs and correlated with malignancy grade (GBM higher than AC II); AHNSCs had low telomerase expression; 4) GSCs invaded normal neurospheres, not vice versa; 5) both AHNSCs and stem cells from AC II and GBM responded to differentiation cues with a dramatic decrease in the proliferation index (Ki-67); 6) GSCs differentiated faster than AHNSCs; 7) upon differentiation, AHNSCs produced normal glia and neurons; GSCs produced morphologically aberrant cells often expressing both glial and neuronal antigens; and 8) differentiation of AHNSCs resulted in 2 typical functional phenotypes: neurons (high electrical membrane resistance, ability to generate action potentials) and glial cells (low membrane resistance, no action potentials). In contrast, GSCs resulted in only 1 functional phenotype: cells with high electrical resistance and active membrane properties capable of generating action potentials. CONCLUSION AHNSCs and stem cells from AC II and GBM differ with respect to proliferation, tumor-forming capacity, and rate and pattern of differentiation.
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Affiliation(s)
- Mercy Varghese
- Vilhelm Magnus Laboratory, Institute for Surgical Research, University of Oslo, Oslo, Norway.
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50
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Park SH, Ramachandran S, Kwon SH, Cha SD, Seo EW, Bae I, Cho C, Song DK. Upregulation of ATP-sensitive potassium channels for estrogen-mediated cell proliferation in human uterine leiomyoma cells. Gynecol Endocrinol 2008; 24:250-6. [PMID: 18569028 DOI: 10.1080/09513590801893315] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
OBJECTIVES The objectives of the present study were to evaluate the expression level of ATP-sensitive potassium (K(ATP)) channels in smooth muscle cells in human uterine leiomyoma and the involvement of the channel in potentiating effect of estrogen on leiomyoma growth. METHODS Reverse transcription-polymerase chain reaction (RT-PCR), real-time PCR and Western blot were used for the identification and quantification of K(ATP)-channel subunits in the control myometrial and leiomyoma cells. Furthermore, we measured the K(ATP)-channel activity in enzymatically isolated single uterine smooth muscle cells by whole-cell patch-clamp recordings. The estrogen-induced cell proliferation in leiomyoma was measured by the MTT assay. RESULTS The subunits of K(ATP) channels (Kir6.1, Kir6.2, SUR2B) were more highly expressed in leiomyoma cells than in control cells. The whole-cell currents mainly through K(ATP) channels were also greater in the leiomyoma cells. Estrogen applied in the bath solution could acutely enhance the channel activity. Estrogen-induced proliferation of the leiomyoma cells was inhibited by pretreatment with glibenclamide, a K(ATP)-channel inhibitor. CONCLUSION Estrogen may induce the proliferation of leiomyoma cells, at least in part, by activating the K(ATP) channel. Increased expression of the K(ATP) channel may be a causal factor for the high growth rate of uterine leiomyoma.
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Affiliation(s)
- Sung-Hee Park
- Department of Physiology, Keimyung University School of Medicine, Daegu, South Korea
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