1
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Delanne-Cuménal M, Lamoine S, Meleine M, Aissouni Y, Prival L, Fereyrolles M, Barbier J, Cercy C, Boudieu L, Schopp J, Lazdunski M, Eschalier A, Lolignier S, Busserolles J. The TREK-1 potassium channel is involved in both the analgesic and anti-proliferative effects of riluzole in bone cancer pain. Biomed Pharmacother 2024; 176:116887. [PMID: 38852511 DOI: 10.1016/j.biopha.2024.116887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 06/03/2024] [Accepted: 06/03/2024] [Indexed: 06/11/2024] Open
Abstract
BACKGROUND The metastasis of tumors into bone tissue typically leads to intractable pain that is both very disabling and particularly difficult to manage. We investigated here whether riluzole could have beneficial effects for the treatment of prostate cancer-induced bone pain and how it could influence the development of bone metastasis. METHODS We used a bone pain model induced by intratibial injection of human PC3 prostate cancer cells into male SCID mice treated or not with riluzole administered in drinking water. We also used riluzole in vitro to assess its possible effect on PC3 cell viability and functionality, using patch-clamp. RESULTS Riluzole had a significant preventive effect on both evoked and spontaneous pain involving the TREK-1 potassium channel. Riluzole did not interfere with PC3-induced bone loss or bone remodeling in vivo. It also significantly decreased PC3 cell viability in vitro. The antiproliferative effect of riluzole is correlated with a TREK-1-dependent membrane hyperpolarization in these cells. CONCLUSION The present data suggest that riluzole could be very useful to manage evoked and spontaneous hypersensitivity in cancer-induced bone pain and has no significant adverse effect on cancer progression.
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Affiliation(s)
- Mélissa Delanne-Cuménal
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Sylvain Lamoine
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Mathieu Meleine
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Youssef Aissouni
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Laetitia Prival
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Mathilde Fereyrolles
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Julie Barbier
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Christine Cercy
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Ludivine Boudieu
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Julien Schopp
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Michel Lazdunski
- Université de Nice Sophia Antipolis, Valbonne 06560, France; CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275, 660 Route des Lucioles Sophia Antipolis, Valbonne 06560, France
| | - Alain Eschalier
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France; Institut Analgesia, Faculté de Médecine, BP38, Clermont-Ferrand 63001, France
| | - Stéphane Lolignier
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France
| | - Jérôme Busserolles
- Université Clermont Auvergne, Inserm, CHU Clermont-Ferrand, Neuro-Dol, Clermont-Ferrand F63000, France.
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2
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Inoue S, Li C, Hatakeyama J, Jiang H, Kuroki H, Moriyama H. Higher-intensity ultrasound accelerates fracture healing via mechanosensitive ion channel Piezo1. Bone 2023; 177:116916. [PMID: 37777037 DOI: 10.1016/j.bone.2023.116916] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 09/08/2023] [Accepted: 09/18/2023] [Indexed: 10/02/2023]
Abstract
Osteoporosis-related fractures are a major public health problem. Mechanobiological stimulation utilizing low-intensity pulsed ultrasound (LIPUS) is the most widely accepted modality for accelerating fracture healing. However, recent evidence has demonstrated the ineffectiveness of LIPUS, and the biophysical mechanisms of ultrasound-induced bone formation also remain elusive. Here, we demonstrate that ultrasound at a higher intensity than LIPUS effectively accelerates fracture healing in a mouse osteoporotic fracture model. Higher-intensity ultrasound promoted chondrogenesis and hypertrophic differentiation of chondrocytes in the fracture callus. Higher-intensity ultrasound also increased osteoblasts and newly formed bone in the callus, resulting in accelerated endochondral ossification during fracture healing. In addition, we found that accelerated fracture healing by ultrasound exposure was attenuated when the mechanosensitive ion channel Piezo1 was inhibited by GsMTx4. Ultrasound-induced new bone formation in the callus was attenuated in fractured mice treated with GsMTx4. Similar results were also confirmed in a 3D osteocyte-osteoblast co-culture system, where osteocytic Piezo1 knockdown attenuated the expression of osteoblastic genes after ultrasound exposure. Together these results demonstrate that higher-intensity ultrasound than clinically used LIPUS can accelerate endochondral ossification after fractures. Furthermore, our results suggest that mechanotransduction via Piezo1 mediates ultrasound-stimulated fracture healing and bone formation.
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Affiliation(s)
- Shota Inoue
- Department of Rehabilitation Science, Graduate School of Health Sciences, Kobe University, Kobe, Japan
| | - Changxin Li
- Department of Rehabilitation Science, Graduate School of Health Sciences, Kobe University, Kobe, Japan
| | - Junpei Hatakeyama
- Department of Rehabilitation Science, Graduate School of Health Sciences, Kobe University, Kobe, Japan; Research Fellowship of the Japan Society for the Promotion of Science, Japan
| | - Hanlin Jiang
- Department of Rehabilitation Science, Graduate School of Health Sciences, Kobe University, Kobe, Japan
| | - Hiroshi Kuroki
- Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hideki Moriyama
- Life and Medical Sciences Area, Health Sciences Discipline, Kobe University, Kobe, Japan.
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3
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Rotherham M, Nahar T, Broomhall TJ, Telling ND, El Haj AJ. Remote magnetic actuation of cell signalling for tissue engineering. CURRENT OPINION IN BIOMEDICAL ENGINEERING 2022. [DOI: 10.1016/j.cobme.2022.100410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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4
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Zúñiga L, Cayo A, González W, Vilos C, Zúñiga R. Potassium Channels as a Target for Cancer Therapy: Current Perspectives. Onco Targets Ther 2022; 15:783-797. [PMID: 35899081 PMCID: PMC9309325 DOI: 10.2147/ott.s326614] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 07/08/2022] [Indexed: 12/18/2022] Open
Abstract
Potassium (K+) channels are highly regulated membrane proteins that control the potassium ion flux and respond to different cellular stimuli. These ion channels are grouped into three major families, Kv (voltage-gated K+ channel), Kir (inwardly rectifying K+ channel) and K2P (two-pore K+ channels), according to the structure, to mediate the K+ currents. In cancer, alterations in K+ channel function can promote the acquisition of the so-called hallmarks of cancer – cell proliferation, resistance to apoptosis, metabolic changes, angiogenesis, and migratory capabilities – emerging as targets for the development of new therapeutic drugs. In this review, we focus our attention on the different K+ channels associated with the most relevant and prevalent cancer types. We summarize our knowledge about the potassium channels structure and function, their cancer dysregulated expression and discuss the K+ channels modulator and the strategies for designing new drugs.
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Affiliation(s)
- Leandro Zúñiga
- Laboratorio de Fisiología Molecular, Escuela de Medicina, Universidad de Talca, Talca, Chile.,Centro de Nanomedicina, Diagnóstico y Desarrollo de Fármacos (ND3), Escuela de Medicina, Universidad de Talca, Talca, Chile
| | - Angel Cayo
- Laboratorio de Fisiología Molecular, Escuela de Medicina, Universidad de Talca, Talca, Chile.,Centro de Nanomedicina, Diagnóstico y Desarrollo de Fármacos (ND3), Escuela de Medicina, Universidad de Talca, Talca, Chile
| | - Wendy González
- Centro de Bioinformática y Simulación Molecular, Universidad de Talca, Talca, Chile.,Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Universidad de Talca, Talca, Chile
| | - Cristian Vilos
- Centro de Nanomedicina, Diagnóstico y Desarrollo de Fármacos (ND3), Escuela de Medicina, Universidad de Talca, Talca, Chile.,Laboratory of Nanomedicine and Targeted Delivery, School of Medicine, Universidad de Talca, Talca, 3460000, Chile.,Center for The Development of Nanoscience & Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, 8350709, Chile
| | - Rafael Zúñiga
- Laboratorio de Fisiología Molecular, Escuela de Medicina, Universidad de Talca, Talca, Chile.,Centro de Nanomedicina, Diagnóstico y Desarrollo de Fármacos (ND3), Escuela de Medicina, Universidad de Talca, Talca, Chile
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5
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Lind T, Melo FR, Gustafson AM, Sundqvist A, Zhao XO, Moustakas A, Melhus H, Pejler G. Mast Cell Chymase Has a Negative Impact on Human Osteoblasts. Matrix Biol 2022; 112:1-19. [PMID: 35908613 DOI: 10.1016/j.matbio.2022.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 07/07/2022] [Accepted: 07/26/2022] [Indexed: 10/16/2022]
Abstract
Mast cells have been linked to osteoporosis and bone fractures, and in a previous study we found that mice lacking a major mast cell protease, chymase, develop increased diaphyseal bone mass. These findings introduce the possibility that mast cell chymase can regulate bone formation, but the underlying mechanism(s) has not previously been investigated. Here we hypothesized that chymase might exert such effects through a direct negative impact on osteoblasts, i.e., the main bone-building cells. Indeed, we show that chymase has a distinct impact on human primary osteoblasts. Firstly, chymase was shown to have pronounced effects on the morphological features of osteoblasts, including extensive cell contraction and actin reorganization. Chymase also caused a profound reduction in the output of collagen from the osteoblasts, and was shown to degrade osteoblast-secreted fibronectin and to activate pro-matrix metallopeptidase-2 released by the osteoblasts. Further, chymase was shown to have a preferential impact on the gene expression, protein output and phosphorylation status of TGFβ-associated signaling molecules. A transcriptomic analysis was conducted and revealed a significant effect of chymase on several genes of importance for bone metabolism, including a reduction in the expression of osteoprotegerin, which was confirmed at the protein level. Finally, we show that chymase interacts with human osteoblasts and is taken up by the cells. Altogether, the present findings provide a functional link between mast cell chymase and osteoblast function, and can form the basis for a further evaluation of chymase as a potential target for intervention in metabolic bone diseases.
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Affiliation(s)
- Thomas Lind
- Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden.
| | - Fabio Rabelo Melo
- Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden
| | - Ann-Marie Gustafson
- Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden; Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden
| | - Anders Sundqvist
- Uppsala University, Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala, Sweden
| | - Xinran O Zhao
- Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden
| | - Aristidis Moustakas
- Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden
| | - Håkan Melhus
- Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden
| | - Gunnar Pejler
- Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden
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6
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Del Sol-Fernández S, Martínez-Vicente P, Gomollón-Zueco P, Castro-Hinojosa C, Gutiérrez L, Fratila RM, Moros M. Magnetogenetics: remote activation of cellular functions triggered by magnetic switches. NANOSCALE 2022; 14:2091-2118. [PMID: 35103278 PMCID: PMC8830762 DOI: 10.1039/d1nr06303k] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 11/13/2021] [Indexed: 05/03/2023]
Abstract
During the last decade, the possibility to remotely control intracellular pathways using physical tools has opened the way to novel and exciting applications, both in basic research and clinical applications. Indeed, the use of physical and non-invasive stimuli such as light, electricity or magnetic fields offers the possibility of manipulating biological processes with spatial and temporal resolution in a remote fashion. The use of magnetic fields is especially appealing for in vivo applications because they can penetrate deep into tissues, as opposed to light. In combination with magnetic actuators they are emerging as a new instrument to precisely manipulate biological functions. This approach, coined as magnetogenetics, provides an exclusive tool to study how cells transform mechanical stimuli into biochemical signalling and offers the possibility of activating intracellular pathways connected to temperature-sensitive proteins. In this review we provide a critical overview of the recent developments in the field of magnetogenetics. We discuss general topics regarding the three main components for magnetic field-based actuation: the magnetic fields, the magnetic actuators and the cellular targets. We first introduce the main approaches in which the magnetic field can be used to manipulate the magnetic actuators, together with the most commonly used magnetic field configurations and the physicochemical parameters that can critically influence the magnetic properties of the actuators. Thereafter, we discuss relevant examples of magneto-mechanical and magneto-thermal stimulation, used to control stem cell fate, to activate neuronal functions, or to stimulate apoptotic pathways, among others. Finally, although magnetogenetics has raised high expectations from the research community, to date there are still many obstacles to be overcome in order for it to become a real alternative to optogenetics for instance. We discuss some controversial aspects related to the insufficient elucidation of the mechanisms of action of some magnetogenetics constructs and approaches, providing our opinion on important challenges in the field and possible directions for the upcoming years.
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Affiliation(s)
- Susel Del Sol-Fernández
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
| | - Pablo Martínez-Vicente
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
| | - Pilar Gomollón-Zueco
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
| | - Christian Castro-Hinojosa
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
| | - Lucía Gutiérrez
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain
- Departamento de Química Analítica, Universidad de Zaragoza, Zaragoza 50009, Spain
| | - Raluca M Fratila
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain
- Departamento de Química Orgánica, Universidad de Zaragoza, C/Pedro Cerbuna 12, Zaragoza 50009, Spain
| | - María Moros
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain
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7
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Role of K + and Ca 2+-Permeable Channels in Osteoblast Functions. Int J Mol Sci 2021; 22:ijms221910459. [PMID: 34638799 PMCID: PMC8509041 DOI: 10.3390/ijms221910459] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 12/20/2022] Open
Abstract
Bone-forming cells or osteoblasts play an important role in bone modeling and remodeling processes. Osteoblast differentiation or osteoblastogenesis is orchestrated by multiple intracellular signaling pathways (e.g., bone morphogenetic proteins (BMP) and Wnt signaling pathways) and is modulated by the extracellular environment (e.g., parathyroid hormone (PTH), vitamin D, transforming growth factor β (TGF-β), and integrins). The regulation of bone homeostasis depends on the proper differentiation and function of osteoblast lineage cells from osteogenic precursors to osteocytes. Intracellular Ca2+ signaling relies on the control of numerous processes in osteoblast lineage cells, including cell growth, differentiation, migration, and gene expression. In addition, hyperpolarization via the activation of K+ channels indirectly promotes Ca2+ signaling in osteoblast lineage cells. An improved understanding of the fundamental physiological and pathophysiological processes in bone homeostasis requires detailed investigations of osteoblast lineage cells. This review summarizes the current knowledge on the functional impacts of K+ channels and Ca2+-permeable channels, which critically regulate Ca2+ signaling in osteoblast lineage cells to maintain bone homeostasis.
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8
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Pei F, Liu J, Zhang L, Pan X, Huang W, Cen X, Huang S, Jin Y, Zhao Z. The functions of mechanosensitive ion channels in tooth and bone tissues. Cell Signal 2020; 78:109877. [PMID: 33296740 DOI: 10.1016/j.cellsig.2020.109877] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/02/2020] [Accepted: 12/03/2020] [Indexed: 02/08/2023]
Abstract
Tooth and bone are independent tissues with a close relationship. Both are composed of a highly calcified outer structure and soft inner tissue, and both are constantly under mechanical stress. In particular, the alveolar bone and tooth constitute an occlusion system and suffer from masticatory and occlusal force. Thus, mechanotransduction is a key process in many developmental, physiological and pathological processes in tooth and bone. Mechanosensitive ion channels such as Piezo1 and Piezo2 are important participants in mechanotransduction, but their functions in tooth and bone are poorly understood. This review summarizes our current understanding of mechanosensitive ion channels and their roles in tooth and bone tissues. Research in these areas may shed new light on the regulation of tooth and bone tissues and potential treatments for diseases affecting these tissues.
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Affiliation(s)
- Fang Pei
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, PR China
| | - Jialing Liu
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, PR China
| | - Lan Zhang
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, PR China
| | - Xuefeng Pan
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, PR China
| | - Wei Huang
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, PR China
| | - Xiao Cen
- Department of the Temporomandibular Joint, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China
| | - Shishu Huang
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, PR China.
| | - Ying Jin
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, PR China.
| | - Zhihe Zhao
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, PR China.
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9
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Darkow E, Rog-Zielinska EA, Madl J, Brandel A, Siukstaite L, Omidvar R, Kohl P, Ravens U, Römer W, Peyronnet R. The Lectin LecA Sensitizes the Human Stretch-Activated Channel TREK-1 but Not Piezo1 and Binds Selectively to Cardiac Non-myocytes. Front Physiol 2020; 11:457. [PMID: 32499717 PMCID: PMC7243936 DOI: 10.3389/fphys.2020.00457] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Accepted: 04/15/2020] [Indexed: 12/16/2022] Open
Abstract
The healthy heart adapts continuously to a complex set of dynamically changing mechanical conditions. The mechanical environment is altered by, and contributes to, multiple cardiac diseases. Mechanical stimuli are detected and transduced by cellular mechano-sensors, including stretch-activated ion channels (SAC). The precise role of SAC in the heart is unclear, in part because there are few SAC-specific pharmacological modulators. That said, most SAC can be activated by inducers of membrane curvature. The lectin LecA is a virulence factor of Pseudomonas aeruginosa and essential for P. aeruginosa-induced membrane curvature, resulting in formation of endocytic structures and bacterial cell invasion. We investigate whether LecA modulates SAC activity. TREK-1 and Piezo1 have been selected, as they are widely expressed in the body, including cardiac tissue, and they are “canonical representatives” for the potassium selective and the cation non-selective SAC families, respectively. Live cell confocal microscopy and electron tomographic imaging were used to follow binding dynamics of LecA, and to track changes in cell morphology and membrane topology in human embryonic kidney (HEK) cells and in giant unilamellar vesicles (GUV). HEK cells were further transfected with human TREK-1 or Piezo1 constructs, and ion channel activity was recorded using the patch-clamp technique. Finally, freshly isolated cardiac cells were used for studies into cell type dependency of LecA binding. LecA (500 nM) binds within seconds to the surface of HEK cells, with highest concentration at cell-cell contact sites. Local membrane invaginations are detected in the presence of LecA, both in the plasma membrane of cells (by 17 min of LecA exposure) as well as in GUV. In HEK cells, LecA sensitizes TREK-1, but not Piezo1, to voltage and mechanical stimulation. In freshly isolated cardiac cells, LecA binds to non-myocytes, but not to ventricular or atrial cardiomyocytes. This cell type specific lack of binding is observed across cardiomyocytes from mouse, rabbit, pig, and human. Our results suggest that LecA may serve as a pharmacological tool to study SAC in a cell type-preferential manner. This could aid tissue-based research into the roles of SAC in cardiac non-myocytes.
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Affiliation(s)
- Elisa Darkow
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg-Bad Krozingen, Medical Center-University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, Freiburg, Germany.,Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Eva A Rog-Zielinska
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg-Bad Krozingen, Medical Center-University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Josef Madl
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg-Bad Krozingen, Medical Center-University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Annette Brandel
- Faculty of Biology, University of Freiburg, Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
| | - Lina Siukstaite
- Faculty of Biology, University of Freiburg, Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
| | - Ramin Omidvar
- Faculty of Biology, University of Freiburg, Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
| | - Peter Kohl
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg-Bad Krozingen, Medical Center-University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
| | - Ursula Ravens
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg-Bad Krozingen, Medical Center-University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Winfried Römer
- Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, Freiburg, Germany.,Faculty of Biology, University of Freiburg, Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
| | - Rémi Peyronnet
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg-Bad Krozingen, Medical Center-University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany
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10
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Chen M, Wu S, Tan Y, Li R, Liu Y, Huang Q. Rubidium-doped titanium surfaces with modulatory effects on MC3T3-E1 cell response and antibacterial capacity against
Staphylococcus aureus. Biomed Mater 2019; 14:045016. [DOI: 10.1088/1748-605x/ab2585] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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11
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Yang JH, Siregar AS, Kim EJ, Nyiramana MM, Shin EJ, Han J, Sohn JT, Kim JW, Kang D. Involvement of TREK-1 Channel in Cell Viability of H9c2 Rat Cardiomyoblasts Affected by Bupivacaine and Lipid Emulsion. Cells 2019; 8:cells8050454. [PMID: 31091801 PMCID: PMC6563050 DOI: 10.3390/cells8050454] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 05/13/2019] [Accepted: 05/14/2019] [Indexed: 12/24/2022] Open
Abstract
Lipid emulsion (LE) therapy has been used to reduce overdose of bupivacaine (BPV)-induced cardiotoxicity. The TWIK-related potassium channel-1 (TREK-1) is inhibited by BPV and activated by polyunsaturated fatty acids, which are the main component in LE. These pharmacological properties inspired us to investigate whether the TREK-1 channel is associated with cell viability of H9c2 cardiomyoblasts affected by BPV and LE. Consistent with previous studies, BPV-induced cell death was reduced by LE treatment. The reduction in the TREK-1 expression level by BPV was alleviated by LE. The BPV cytotoxicity highly decreased in TREK-1 overexpressed cells but was the opposite in TREK-1 knocked-down cells. TREK-1 channel activators and inhibitors increased and decreased cell viability, respectively. BPV-induced depolarization of the plasma and mitochondrial membrane potential and increase in intracellular Ca2+ level were blocked by LE treatment. BPV-induced depolarization of membrane potential was reduced in TREK-1 overexpressed cells, indicating that TREK-1 channels mediate setting the resting membrane potentials as a background K+ channel in H9c2 cells. These results show that TREK-1 activity is involved in the BPV cytotoxicity and the antagonistic effect of LE in H9c2 cells and suggest that TREK-1 could be a target for action of BPV and LE.
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Affiliation(s)
- Jun Ho Yang
- Departments of Medicine and Thoracic and Cardiovascular Surgery, College of Medicine, Gyeongsang National University, Jinju 52727, Korea.
- Gyeongsang National University Changwon Hospital, Changwon 51472, Korea.
| | - Adrian S Siregar
- Department of Physiology, College of Medicine and Institute of Health Sciences, Gyeongsang National University, Jinju 52727, Korea.
- Department of Convergence Medical Science, Gyeongsang National University, Jinju 52727, Korea.
| | - Eun-Jin Kim
- Department of Physiology, College of Medicine and Institute of Health Sciences, Gyeongsang National University, Jinju 52727, Korea.
| | - Marie Merci Nyiramana
- Department of Physiology, College of Medicine and Institute of Health Sciences, Gyeongsang National University, Jinju 52727, Korea.
- Department of Convergence Medical Science, Gyeongsang National University, Jinju 52727, Korea.
| | - Eui-Jung Shin
- Department of Physiology, College of Medicine and Institute of Health Sciences, Gyeongsang National University, Jinju 52727, Korea.
- Department of Convergence Medical Science, Gyeongsang National University, Jinju 52727, Korea.
| | - Jaehee Han
- Department of Physiology, College of Medicine and Institute of Health Sciences, Gyeongsang National University, Jinju 52727, Korea.
| | - Ju-Tae Sohn
- Department of Anesthesiology and Pain Medicine, College of Medicine, Gyeongsang National University, Jinju 52727, Korea.
| | - Jong Woo Kim
- Departments of Medicine and Thoracic and Cardiovascular Surgery, College of Medicine, Gyeongsang National University, Jinju 52727, Korea.
- Gyeongsang National University Changwon Hospital, Changwon 51472, Korea.
| | - Dawon Kang
- Department of Physiology, College of Medicine and Institute of Health Sciences, Gyeongsang National University, Jinju 52727, Korea.
- Department of Convergence Medical Science, Gyeongsang National University, Jinju 52727, Korea.
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12
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Li Y, Ye D, Li M, Ma M, Gu N. Adaptive Materials Based on Iron Oxide Nanoparticles for Bone Regeneration. Chemphyschem 2018. [DOI: 10.1002/cphc.201701294] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yan Li
- Southeast University; State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Science and Medical Engineering, Sipailou 2; 210096 Nanjing China
| | - Dewen Ye
- Southeast University; State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Science and Medical Engineering, Sipailou 2; 210096 Nanjing China
| | - Mingxi Li
- Southeast University; State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Science and Medical Engineering, Sipailou 2; 210096 Nanjing China
| | - Ming Ma
- Southeast University; State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Science and Medical Engineering, Sipailou 2; 210096 Nanjing China
| | - Ning Gu
- Southeast University; State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Science and Medical Engineering, Sipailou 2; 210096 Nanjing China
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Extraoral Taste Receptor Discovery: New Light on Ayurvedic Pharmacology. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2017. [PMID: 28642799 PMCID: PMC5469997 DOI: 10.1155/2017/5435831] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
More and more research studies are revealing unexpectedly important roles of taste for health and pathogenesis of various diseases. Only recently it has been shown that taste receptors have many extraoral locations (e.g., stomach, intestines, liver, pancreas, respiratory system, heart, brain, kidney, urinary bladder, pancreas, adipose tissue, testis, and ovary), being part of a large diffuse chemosensory system. The functional implications of these taste receptors widely dispersed in various organs or tissues shed a new light on several concepts used in ayurvedic pharmacology (dravyaguna vijnana), such as taste (rasa), postdigestive effect (vipaka), qualities (guna), and energetic nature (virya). This review summarizes the significance of extraoral taste receptors and transient receptor potential (TRP) channels for ayurvedic pharmacology, as well as the biological activities of various types of phytochemical tastants from an ayurvedic perspective. The relative importance of taste (rasa), postdigestive effect (vipaka), and energetic nature (virya) as ethnopharmacological descriptors within Ayurveda boundaries will also be discussed.
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Abdoulaye IA, Guo YJ. A Review of Recent Advances in Neuroprotective Potential of 3-N-Butylphthalide and Its Derivatives. BIOMED RESEARCH INTERNATIONAL 2016; 2016:5012341. [PMID: 28053983 PMCID: PMC5178327 DOI: 10.1155/2016/5012341] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 10/30/2016] [Accepted: 11/01/2016] [Indexed: 01/26/2023]
Abstract
The research of alternative treatment for ischemic stroke and degenerative diseases has always been a priority in neurology. 3-N-Butylphthalide (NBP), a family of compounds initially isolated from the seeds of Apium graveolens Linn., has shown significant neuroprotective effects. Previous extensive studies have demonstrated that NBP promotes a better poststroke outcome and exerts a multitargeted action on several mechanisms, from oxidative stress to mitochondrial dysfunction to apoptosis to inflammation. Additionally, recent findings on several neurological disorders have shown that NBP's beneficial effects extend beyond the management of stroke. However, despite the increasing number of studies toward a better understanding and the rapid advances made in therapeutic options, to date, dl-3-N-butylphthalide, a synthetic variation of l-3-N-butylphthalide, remains the only clinically approved anti-ischemic agent in China, stressing the difficulties for a viable and effective transition from experimental to clinical practice. Events indicate that NBP, due to its multitargeted effect and the adaptability of its basic structure, can be an important game changer and a precursor to a whole new therapeutic approach to several neurological conditions. The present review discusses recent advances pertaining to the neuroprotective mechanisms of NBP-derived compounds and the possibility of their clinical implementation in the management of various neurological conditions.
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Affiliation(s)
- Idriss Ali Abdoulaye
- Department of Neurology, The Southeast University Affiliated Zhong Da Hospital, No. 87 Dingjiaqiao, Nanjing, Jiangsu Province 210009, China
| | - Yi Jing Guo
- Department of Neurology, The Southeast University Affiliated Zhong Da Hospital, No. 87 Dingjiaqiao, Nanjing, Jiangsu Province 210009, China
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15
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pH-sensitive K+ channel TREK-1 is a novel target in pancreatic cancer. Biochim Biophys Acta Mol Basis Dis 2016; 1862:1994-2003. [DOI: 10.1016/j.bbadis.2016.07.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 06/16/2016] [Accepted: 07/15/2016] [Indexed: 12/17/2022]
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16
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Over-expressed human TREK-1 inhibits CHO cell proliferation via inhibiting PKA and p38 MAPK pathways and subsequently inducing G1 arrest. Acta Pharmacol Sin 2016; 37:1190-8. [PMID: 27397543 DOI: 10.1038/aps.2016.65] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 04/22/2016] [Indexed: 12/20/2022] Open
Abstract
AIM Recent studies have shown that the two-pore-domain potassium channel TREK-1 is involved in the proliferation of neural stem cells, astrocytes and human osteoblasts. In this study, we investigated how TREK-1 affected the proliferation of Chinese hamster ovary (CHO) cells in vitro. METHODS A CHO cell line stably expressing hTREK-1 (CHO/hTREK-1 cells) was generated. TREK-1 channel currents in the cells were recorded using whole-cell voltage-clamp recording. The cell cycle distribution was assessed using flow cytometry analysis. The expression of major signaling proteins involved was detected with Western blotting. RESULTS CHO/hTREK-1 cells had a high level of TREK-1 expression, reached up to 320%±16% compared to the control cells. Application of arachidonic acid (10 μmol/L), chloroform (1 mmol/L) or etomidate (10 μmol/L) substantially increased TREK-1 channel currents in CHO/hTREK-1 cells. Overexpression of TREK-1 caused CHO cells arresting at the G1 phase, and significantly decreased the expression of cyclin D1. The TREK-1 inhibitor l-butylphthalide (1-100 μmol/L) dose-dependently attenuated TREK-1-induced G1 phase cell arrest. Moreover, overexpression of TREK-1 significantly decreased the phosphorylation of Akt (S473), glycogen synthase kinase-3β (S9) and cAMP response element-binding protein (CREB, S133), enhanced the phosphorylation of p38 (T180/Y182), but did not alter the phosphorylation and expression of signal transducer and activator of transcription 3 (STAT3). CONCLUSION TREK-1 overexpression suppresses CHO cell proliferation by inhibiting the activity of PKA and p38/MAPK signaling pathways and subsequently inducing G1 phase cell arrest.
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Hivelin C, Béraud-Dufour S, Devader C, Abderrahmani A, Moreno S, Moha ou Maati H, Djillani A, Heurteaux C, Borsotto M, Mazella J, Coppola T. Potentiation of Calcium Influx and Insulin Secretion in Pancreatic Beta Cell by the Specific TREK-1 Blocker Spadin. J Diabetes Res 2016; 2016:3142175. [PMID: 28105440 PMCID: PMC5220496 DOI: 10.1155/2016/3142175] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 11/21/2016] [Accepted: 11/29/2016] [Indexed: 12/17/2022] Open
Abstract
Inhibition of the potassium channels TREK-1 by spadin (SPA) is currently thought to be a promising therapeutic target for the treatment of depression. Since these channels are expressed in pancreatic β-cells, we investigated their role in the control of insulin secretion and glucose homeostasis. In this study, we confirmed the expression of TREK-1 channels in the insulin secreting MIN6-B1 β-cell line and in mouse islets. We found that their blockade by SPA potentiated insulin secretion induced by potassium chloride dependent membrane depolarization. Inhibition of TREK-1 by SPA induced a decrease of the resting membrane potential (ΔVm ~ 12 mV) and increased the cytosolic calcium concentration. In mice, administration of SPA enhanced the plasma insulin level stimulated by glucose, confirming its secretagogue effect observed in vitro. Taken together, this work identifies SPA as a novel potential pharmacological agent able to control insulin secretion and glucose homeostasis.
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Affiliation(s)
- Céline Hivelin
- CNRS, Inserm, IPMC, Université Côte d'Azur, Valbonne, France
| | | | | | - Amar Abderrahmani
- CNRS, CHU Lille, Institut Pasteur de Lille, UMR 8199-EGID, Université Lille, 59000 Lille, France
| | | | - Hamid Moha ou Maati
- Département de Physiologie, Institut de Génomique Fonctionnelle (IGF), CNRS/INSERM UMR5203, Université de Montpellier, Montpellier, France
| | | | | | - Marc Borsotto
- CNRS, Inserm, IPMC, Université Côte d'Azur, Valbonne, France
| | - Jean Mazella
- CNRS, Inserm, IPMC, Université Côte d'Azur, Valbonne, France
| | - Thierry Coppola
- CNRS, Inserm, IPMC, Université Côte d'Azur, Valbonne, France
- *Thierry Coppola:
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18
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Devader C, Khayachi A, Veyssière J, Moha Ou Maati H, Roulot M, Moreno S, Borsotto M, Martin S, Heurteaux C, Mazella J. In vitro and in vivo regulation of synaptogenesis by the novel antidepressant spadin. Br J Pharmacol 2015; 172:2604-17. [PMID: 25598009 DOI: 10.1111/bph.13083] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Revised: 12/10/2014] [Accepted: 01/08/2015] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND AND PURPOSE We have described a novel antidepressant peptide, spadin, that acts by blocking the TWIK-related-potassium channel, type 1 (TREK-1). Here, we examined possible mechanisms of action of spadin at both molecular and cellular levels. EXPERIMENTAL APPROACHES Effects of spadin were measured in primary cultures of neurons or tissues from mice injected i.v. with spadin. Western blots, qPCR, histochemical and electrophysiological techniques were used. KEY RESULTS In vitro, spadin increased neuronal membrane potential and activated both the MAPK and PI3K signalling pathways, in a time- and concentration-dependent manner. The latter pathway was involved in the protective effect of spadin against staurosporine-induced apoptosis. Also, spadin enhanced both mRNA expression and protein of two markers of synaptogenesis, the post-synaptic density protein of 95 kDalton (PSD-95) and synapsin. We confirmed these effects on synaptogenesis by the observation that spadin treatment significantly increased the proportion of mature spines in cortical neurons. Finally, in vivo injections of spadin led to a rapid increase in both mRNA expression and protein level of brain-derived neurotrophic factor (BDNF) in the hippocampus, confirming the antidepressant action of the peptide. We argue for a new role of spadin in synaptogenesis as both PSD-95 and synapsin mRNA expression and protein levels were further enhanced in the hippocampus, following treatment in vivo with the peptide. CONCLUSIONS AND IMPLICATIONS These findings provide new mechanisms of action for the rapidly acting antidepressant peptide spadin by stimulating expression of BDNF and synaptic proteins, both in vitro and in vivo.
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Affiliation(s)
- C Devader
- CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275, Université de Nice-Sophia Antipolis, Valbonne, France
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19
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Tsuchiya N, Kodama D, Goto S, Togari A. Shear stress-induced Ca(2+) elevation is mediated by autocrine-acting glutamate in osteoblastic MC3T3-E1 cells. J Pharmacol Sci 2015; 127:311-8. [PMID: 25837928 DOI: 10.1016/j.jphs.2015.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 01/20/2015] [Accepted: 01/21/2015] [Indexed: 11/28/2022] Open
Abstract
Mechanical loading is an important regulatory factor in bone homeostasis. Neurotransmitters, such as glutamate and ATP, are known to be released from osteoblasts, but their roles have been less studied. In this study, we investigated the role of transmitter release in mechanotransduction. To identify from where transmitters were released, focal fluid flow was applied to a single cell of MC3T3-E1, mouse calvaria-derived osteoblastic cell line, by using a glass micropipette. Intracellular Ca(2+) elevation induced by the focal shear stress was eliminated by either GdCl3, a mechanosensing channel inhibitor, or removal of extracellular Ca(2+). On the other hand, the focal shear stress-induced Ca(2+) elevation was also significantly suppressed by inositol triphosphate receptor antagonist or vesicular release inhibitors. These results suggest that not only mechanosensitive channel-mediated Ca(2+) influx but also some autocrine transmitters are involved in mechanotransduction. Additionally, glutamate receptor antagonists, but not ATP receptor antagonist, suppressed most of the focal shear stress-induced Ca(2+) elevation. Therefore, it is suggested that glutamate is released from osteoblasts following the activation of mechanosensitive Ca(2+) channels and acts in an autocrine manner. The glutamate release may have a significant role in the initial event of mechanotransduction in bone tissue.
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Affiliation(s)
- Norika Tsuchiya
- Department of Pharmacology, School of Dentistry, Aichi-Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan; Department of Orthodontics, School of Dentistry, Aichi-Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya 464-8651, Japan
| | - Daisuke Kodama
- Department of Pharmacology, School of Dentistry, Aichi-Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
| | - Shigemi Goto
- Department of Orthodontics, School of Dentistry, Aichi-Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya 464-8651, Japan
| | - Akifumi Togari
- Department of Pharmacology, School of Dentistry, Aichi-Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan.
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20
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Henstock JR, Rotherham M, Rashidi H, Shakesheff KM, El Haj AJ. Remotely Activated Mechanotransduction via Magnetic Nanoparticles Promotes Mineralization Synergistically With Bone Morphogenetic Protein 2: Applications for Injectable Cell Therapy. Stem Cells Transl Med 2014; 3:1363-74. [PMID: 25246698 DOI: 10.5966/sctm.2014-0017] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Bone requires dynamic mechanical stimulation to form and maintain functional tissue, yet mechanical stimuli are often lacking in many therapeutic approaches for bone regeneration. Magnetic nanoparticles provide a method for delivering these stimuli by directly targeting cell-surface mechanosensors and transducing forces from an external magnetic field, resulting in remotely controllable mechanotransduction. In this investigation, functionalized magnetic nanoparticles were attached to either the mechanically gated TREK1 K+ channel or the (integrin) RGD-binding domains of human mesenchymal stem cells. These cells were microinjected into an ex vivo chick fetal femur (embryonic day 11) that was cultured organotypically in vitro as a model for endochondral bone formation. An oscillating 25-mT magnetic field delivering a force of 4 pN per nanoparticle directly against the mechanoreceptor induced mechanotransduction in the injected mesenchymal stem cells. It was found that cells that received mechanical stimuli via the nanoparticles mineralized the epiphyseal injection site more extensively than unlabeled control cells. The nanoparticle-tagged cells were also seeded into collagen hydrogels to evaluate osteogenesis in tissue-engineered constructs: in this case, inducing mechanotransduction by targeting TREK1 resulted in a 2.4-fold increase in mineralization and significant increases in matrix density. In both models, the combination of mechanical stimulation and sustained release of bone morphogenetic protein 2 (BMP2) from polymer microspheres showed a significant additive effect on mineralization, increasing the effectiveness of BMP2 delivery and demonstrating that nanoparticle-mediated mechanotransduction can be used synergistically with pharmacological approaches for orthopedic tissue engineering to maximize bone formation.
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Affiliation(s)
- James R Henstock
- Institute for Science and Technology in Medicine, Keele University, Stoke-on-Trent, United Kingdom; School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Michael Rotherham
- Institute for Science and Technology in Medicine, Keele University, Stoke-on-Trent, United Kingdom; School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Hassan Rashidi
- Institute for Science and Technology in Medicine, Keele University, Stoke-on-Trent, United Kingdom; School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Kevin M Shakesheff
- Institute for Science and Technology in Medicine, Keele University, Stoke-on-Trent, United Kingdom; School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Alicia J El Haj
- Institute for Science and Technology in Medicine, Keele University, Stoke-on-Trent, United Kingdom; School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
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Hao X, Li X. The knockdown of TASK-1 channels improved the proliferation of N2A cells. J Mol Neurosci 2014; 55:314-7. [PMID: 24848104 DOI: 10.1007/s12031-014-0323-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 05/02/2014] [Indexed: 01/08/2023]
Abstract
Previous studies indicated that K(+) channels, such as voltage-gated Kv channels, were involved in the apoptosis and proliferation of neurons. In the experiments here, the small interfering RNAs (siRNAs) targeted against TASK-1, an acid-sensitive member of two-pore domain K(+) (K2P) channel family, were transfected into mouse neuroblastoma N2A cells. This treatment induced a reduction of messenger RNA (mRNA) level of TASK-1 by 61%. As a negative control, however, the transfection of scrambled siRNAs (scRNA) did not significantly affect the expression of TASK-1 in N2A cells. Furthermore, exposure to TASK-1-specific siRNAs (siTASK-1) for 48 h also substantially increased the proliferation rates of N2A cells by 25.8%, but no effect was observed in scRNA-treated cells. These data implied that TASK-1 channels may participate in the regulation of neuronal proliferation.
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Affiliation(s)
- Xuran Hao
- Department of Neuroscience, South-Central University for Nationalities, 182 Minyuan Road, 430074, Wuhan, China
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22
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Kodama D, Togari A. Noradrenaline stimulates cell proliferation by suppressing potassium channels via G(i/o) -protein-coupled α(1B) -adrenoceptors in human osteoblasts. Br J Pharmacol 2013; 168:1230-9. [PMID: 23061915 DOI: 10.1111/bph.12000] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 09/20/2012] [Accepted: 09/24/2012] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND AND PURPOSE Recent studies demonstrated that the sympathetic nervous system regulates bone metabolism via β(2) -adrenoceptors. Although α-adrenoceptors are also expressed in osteogenic cells, their functions in bone metabolism have been less studied. We previously demonstrated that noradrenaline suppressed potassium currents via α(1B) -adrenoceptors in the human osteoblast SaM-1 cell line. The aim of this study was to investigate the signal transduction pathway and the physiological role of noradrenaline in human osteoblasts in more detail. EXPERIMENTAL APPROACH To investigate signal transduction through α(1B) -adrenoceptors, we used whole-cell patch clamp recording and Ca fluorescence imaging. Potassium channels regulate membrane potential and cell proliferation activity in non-excitable cells, so we evaluated cell proliferation activity by BrdU incorporation and WST assay. KEY RESULTS In SaM-1 cells, bath-applied noradrenaline elevated intracellular Ca(2+) concentration and this effect was abolished by both chloroethylclonidine, an α(1B) -adrenoceptor antagonist, and U73122, a PLC inhibitor. However, the inhibitory effect of noradrenaline on whole-cell current was unaffected by U73122. In contrast, in cells pretreated with either Pertussis toxin, a G(i/o) -protein-coupled receptor inhibitor, or gallein, a Gβγ-protein inhibitor, the inhibitory effect of noradrenaline on whole-cell current was significantly suppressed. Noradrenaline-induced enhancement of cell proliferation was inhibited by CsCl, a non-selective potassium channel blocker, gallein and H89, a PKA inhibitor, but not by U73122. CONCLUSIONS AND IMPLICATIONS Noradrenaline facilitated cell proliferation by regulation of potassium currents in human osteoblasts via G(i/o) -protein-coupled α(1B) -adrenoceptors, not via coupling to Gq-proteins.
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Affiliation(s)
- D Kodama
- Department of Pharmacology, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan
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Li X, Dong X, Zheng S, Xiao J. Expression and localization of TASK-1, -2 and -3 channels in MG63 human osteoblast-like cells. Oncol Lett 2012; 5:865-869. [PMID: 23425722 PMCID: PMC3576195 DOI: 10.3892/ol.2012.1088] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 12/12/2012] [Indexed: 11/06/2022] Open
Abstract
It is well known that a number of ion channels are involved in the proliferation, migration and invasion of tumor cells. TASK channels, an acid-sensitive subgroup of the two-pore-domain K+ channel (K2P) family, are expressed in numerous types of tissue and exhibit various physiological functions depending on the cell type. In the present study, we employed RT-PCR and western blot analysis to determine the expression of TASK-1, -2 and -3 at the mRNA and protein levels in MG63 human osteoblast-like cells. Immunofluorescence with specific antibodies against the TASK channels revealed the localization patterns at the plasma membrane and the juxtanuclear compartment. The induced fluctuations in the extracellular pH from 7.4 to 6.9 and to 6.4 significantly reduced the proliferation rate of MG63 cells by 44.3 and 90.1%, respectively. These data revealed the expression of TASK-1, -2 and -3, and the correlation between TASK channels and cell proliferation in MG63 cells, suggesting that these channels may be involved in the tumorigenesis of osteosarcoma.
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Affiliation(s)
- Xiantao Li
- College of Biomedical Engineering, South-Central University for Nationalities, Wuhan 430074
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Li X, Zheng S, Dong X, Xiao J. 17β-Estradiol inhibits outward voltage-gated K⁺ currents in human osteoblast-like MG63 cells. J Membr Biol 2012; 246:39-45. [PMID: 22976040 DOI: 10.1007/s00232-012-9502-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 08/29/2012] [Indexed: 11/29/2022]
Abstract
Previous studies have shown that 17β-estradiol has a pivotal function by blocking voltage-gated K⁺ (Kv) channels in several different types of cells such as cardiac myocytes and neurons. Outward Kv currents can also be measured in osteoblasts, although little is known about the effects of 17β-estradiol on these currents. In human osteoblast-like MG63 cells, we found that 17β-estradiol inhibits peak and end Kv currents, with IC₅₀ values of 480 and 325 nM, respectively. To elucidate the mechanism of inhibition, the kinetics of Kv currents were investigated. The half-maximum activation potential (V(½)) was 1.3 mV and was shifted left to -4.4 mV after application of 500 nM 17β-estradiol. For steady-state inactivation, the V(½) was -55.0 mV and weakly shifted left to -58.2 mV. To identify the molecular basis of outward Kv currents in MG63 cells, we performed RT-PCR analyses. The expression of Kv2.1 channels appeared to dominate over that of other Kv channels in MG63 cells. In COS-7 cells with heterologously expressed Kv2.1 channels, 17β-estradiol also inhibits macroscopic currents of Kv2.1. Our data indicate that 17β-estradiol inhibits Kv currents in human osteoblast-like MG63 cells and that Kv2.1 is a potential molecular correlate of outward Kv currents in these cells.
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Affiliation(s)
- Xiantao Li
- College of Biomedical Engineering, South-Central University for Nationalities, 708 Minyuan Road, Wuhan 430074, People's Republic of China
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Blair HC, Robinson LJ, Huang CLH, Sun L, Friedman PA, Schlesinger PH, Zaidi M. Calcium and bone disease. Biofactors 2011; 37:159-67. [PMID: 21674636 PMCID: PMC3608212 DOI: 10.1002/biof.143] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 12/18/2010] [Indexed: 11/12/2022]
Abstract
Calcium transport and calcium signaling are of basic importance in bone cells. Bone is the major store of calcium and a key regulatory organ for calcium homeostasis. Bone, in major part, responds to calcium-dependent signals from the parathyroids and via vitamin D metabolites, although bone retains direct response to extracellular calcium if parathyroid regulation is lost. Improved understanding of calcium transporters and calcium-regulated cellular processes has resulted from analysis of genetic defects, including several defects with low or high bone mass. Osteoblasts deposit calcium by mechanisms including phosphate and calcium transport with alkalinization to absorb acid created by mineral deposition; cartilage calcium mineralization occurs by passive diffusion and phosphate production. Calcium mobilization by osteoclasts is mediated by acid secretion. Both bone forming and bone resorbing cells use calcium signals as regulators of differentiation and activity. This has been studied in more detail in osteoclasts, where both osteoclast differentiation and motility are regulated by calcium.
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Affiliation(s)
- Harry C Blair
- Department of Pathology, University of Pittsburgh, Veterans Affairs Health System, PA, USA.
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Xi G, Zhang X, Zhang L, Sui Y, Hui J, Liu S, Wang Y, Li L, Zhang Z. Fluoxetine attenuates the inhibitory effect of glucocorticoid hormones on neurogenesis in vitro via a two-pore domain potassium channel, TREK-1. Psychopharmacology (Berl) 2011; 214:747-59. [PMID: 21069514 DOI: 10.1007/s00213-010-2077-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Accepted: 10/27/2010] [Indexed: 01/17/2023]
Abstract
RATIONALE Sustained stress and elevated glucocorticoid reduces neurogenesis, whereas chronic treatment with antidepressants increases neurogenesis and blocks the effects of stress. Recently, TREK-1, a two-pore domain (K(2)p) potassium channel, has been shown to be involved in the mechanisms of major depression. OBJECTIVES This study aimed to investigate whether TREK-1 is involved in the alteration of neurogenesis according to glucocorticoids and antidepressants. RESULTS The present study addressed the expression of TREK-1 in neural stem cells (NSCs) and found TREK-1 was only associated with NSC proliferation. Bupivacaine and curcumin, two strong TREK-1 channel inhibitors, significantly increased embryonic NSC viability and proliferation while transfection of hTREK-1 decreased cell proliferation in embryonic NSCs. Dexamethasone, a glucocorticoid hormone receptor agonist, upregulated both protein and mRNA levels of TREK-1 leading to decreased NSC proliferation which could be reversed by bupivacaine. Fluoxetine, a serotonin reuptake inhibitor antidepressant that has been previously found to inhibit TREK-1 channels, robustly, could attenuate the upregulation of TREK-1 expression and the inhibition of NSC proliferation induced by dexamethasone. CONCLUSIONS Taken together, these data suggest that TREK-1 is associated with NSC proliferation and probably is a modulator of the effect that fluoxetine attenuates the inhibitory neurogenesis induced by glucocorticoid hormones.
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Affiliation(s)
- Guangjun Xi
- The Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, 210009, China
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Kanczler JM, Sura HS, Magnay J, Green D, Oreffo ROC, Dobson JP, El Haj AJ. Controlled differentiation of human bone marrow stromal cells using magnetic nanoparticle technology. Tissue Eng Part A 2011; 16:3241-50. [PMID: 20504072 DOI: 10.1089/ten.tea.2009.0638] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Targeting and differentiating stem cells at sites of injury and repair is an exciting and promising area for disease treatment and reparative medicine. We have investigated remote magnetic field activation of magnetic nanoparticle-tagged mechanosensitive receptors on the cell membrane of human bone marrow stromal cells (HBMSCs) for use in osteoprogenitor cell delivery systems and activation of differentiation in vitro and in vivo toward an osteochondral lineage. HBMSC-labeled with magnetic beads coated with antibodies or peptides to the transmembrane ion channel stretch activated potassium channel (TREK-1) or arginine–glycine–aspartic acid were cultured in monolayer or encapsulated into polysaccharide alginate/chitosan microcapsules. Upregulation in gene expression was measured in magnetic particle-labeled HBMSCs in response to TREK-1 activation over a short period (7 days) with an increase in mRNA levels of Sox9, core binding factor alpha1 (Cbfa1), and osteopontin. Magnetic particle-labeled HBMSCs encapsulated into alginate chitosan capsules were exposed to magnetic forces both in vitro and in vivo intermittently for 21 days. After 21 days the encapsulated, magnetic particle-labeled HBMSCs in vivo were viable as evidenced by extensive cell tracker green fluorescence. The mechanical stimulation of HBMSCs labeled with TREK-1 magnetic nanoparticle receptors enhanced expression of type-1 collagen in vitro with increases in proteoglycan matrix, core binding factor alpha1 (Cbfa1) and collagen synthesis, and extracellular matrix production and elevated the expression of type-1 and type-2 collagen in vivo. Additionally, the magnetically remote stimulation of HBMSCs labeled with magnetic nanoparticle arginine–glycine–aspartic acid considerably enhanced proteoglycan and collagen synthesis and extracellular matrix production and elevated the expression of type-1 and type-2 collagen in vivo and in vitro. Osteogenic mechanosensitive receptor manipulation by magnetic nanotechnology can induce the differentiation of osteoprogenitor cell populations toward an osteogenic lineage. These cell manipulation strategies offer tremendous therapeutic opportunities in soft and hard tissue repair.
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Affiliation(s)
- Janos M Kanczler
- Bone and Joint Research Group, Centre for Human Development, Stem Cells, and Regeneration, Institute of Developmental Sciences, University of Southampton, Southampton, United Kingdom
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28
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Modulation of potassium channels via the α1B-adrenergic receptor in human osteoblasts. Neurosci Lett 2010; 485:102-6. [DOI: 10.1016/j.neulet.2010.08.073] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2010] [Revised: 08/11/2010] [Accepted: 08/25/2010] [Indexed: 12/29/2022]
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Zhao F, Dong L, Cheng L, Zeng Q, Su F. Effects of acute mechanical stretch on the expression of mechanosensitive potassium channel TREK-1 in rat left ventricle. ACTA ACUST UNITED AC 2010; 27:385-7. [PMID: 17828492 DOI: 10.1007/s11596-007-0409-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2006] [Indexed: 10/22/2022]
Abstract
To explore the role of mechanosensitive potassium channel TREK-1, Western blot analysis was used to investigate the expression changes of TREK-1 in left ventricle in acute mechanically stretched heart. Forty Wistar rats were randomly divided into 8 groups (n=5 in each group), subject to single Langendorff perfusion for 0, 30, 60, 120 min and acute mechanical stretch for 0, 30, 60, 120 min respectively. With Langendorff apparatus, an acute mechanically stretched heart model was established. There was no significant difference in the expression of TREK-1 among single Langendorff perfusion groups (P>0.05). As compared to non-stretched Langendorff-perfused heart, only the expression of TREK-1 in acute mechanically stretched heart (120 min) was greatly increased (P<0.05). This result suggested that some course of mechanical stretch could up-regulate the expression of TREK-1 in left ventricle. TREK-1 might play an important role in mechanoelectric feedback, so it could reduce the occurrence of arrhythmia that was induced by extra mechanical stretch.
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Affiliation(s)
- Fang Zhao
- Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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30
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Kirkham G, Elliot K, Keramane A, Salter D, Dobson J, El Haj A, Cartmell S. Hyperpolarization of Human Mesenchymal Stem Cells in Response to Magnetic Force. IEEE Trans Nanobioscience 2010; 9:71-4. [DOI: 10.1109/tnb.2010.2042065] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chen JH, Liu C, You L, Simmons CA. Boning up on Wolff's Law: mechanical regulation of the cells that make and maintain bone. J Biomech 2009; 43:108-18. [PMID: 19818443 DOI: 10.1016/j.jbiomech.2009.09.016] [Citation(s) in RCA: 204] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/21/2009] [Indexed: 12/31/2022]
Abstract
Bone tissue forms and is remodeled in response to the mechanical forces that it experiences, a phenomenon described by Wolff's Law. Mechanically induced formation and adaptation of bone tissue is mediated by bone cells that sense and respond to local mechanical cues. In this review, the forces experienced by bone cells, the mechanotransduction pathways involved, and the responses elicited are considered. Particular attention is given to two cell types that have emerged as key players in bone mechanobiology: osteocytes, the putative primary mechanosensors in intact bone; and osteoprogenitors, the cells responsible for bone formation and recently implicated in ectopic calcification of cardiovascular tissues. Mechanoregulation of bone involves a complex interplay between these cells, their microenvironments, and other cell types. Thus, dissection of the role of mechanics in regulating bone cell fate and function, and translation of that knowledge to improved therapies, requires identification of relevant cues, multifactorial experimental approaches, and advanced model systems that mimic the mechanobiological environment.
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Affiliation(s)
- Jan-Hung Chen
- Department of Mechanical & Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON, Canada M5S 3G8
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32
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Henney NC, Li B, Elford C, Reviriego P, Campbell AK, Wann KT, Evans BAJ. A large-conductance (BK) potassium channel subtype affects both growth and mineralization of human osteoblasts. Am J Physiol Cell Physiol 2009; 297:C1397-408. [PMID: 19776394 DOI: 10.1152/ajpcell.00311.2009] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The pharmacology of the large-conductance K(+) (BK) channel in human osteoblasts is not well defined, and its role in bone is speculative. Here we assess BK channel properties in MG63 cells and primary human osteoblasts and determine whether pharmacological modulation affects cell function. We used RT-PCR and patch-clamp methods to determine the expression of BK channel subunits and cell number assays in the absence and presence of BK channel modulators. RT-PCR showed the presence of KCNMA1, KCNMB1, KCNMB2, KCNMB3, and KCNMB4 subunits. The BK channel was voltage dependent, with a mean unitary conductance of 228.8 pS (n = 10) in cell-attached patches (140 mM K(+)/140 mM K(+)) and a conductance of 142.5 pS (n = 16) in excised outside-out and 155 pS (n = 6) in inside-out patches in 3 mM K(+)/140 mM K(+). The selectivity ratio (ratio of K(+) to Na(+) permeability) was 15:1. The channel was blocked by tetraethylammonium (TEA, 0.3 mM), iberiotoxin (5-60 nM), tetrandrine (5-30 microM), and paxilline (10 microM) and activated by isopimaric acid (20 microM). BK channel modulators affected MG63 cell numbers: TEA and tetrandrine significantly increased cell numbers at low concentrations (3 mM and 3 microM, respectively) and reduced cell numbers at higher concentrations (>10 mM and >10 microM, respectively). Neither iberiotoxin (20-300 nM) nor slotoxin (300 nM) affected cell numbers. The increase in cell numbers by TEA was blocked by isopimaric acid. TEA (0.1-3.0 mM) significantly increased mineralization in primary osteoblasts. In conclusion, the BK channel has a distinctive pharmacology and is thus a target for therapeutic strategies aimed at modulating osteoblast proliferation and function.
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Hughes S, McBain S, Dobson J, El Haj AJ. Selective activation of mechanosensitive ion channels using magnetic particles. J R Soc Interface 2008; 5:855-63. [PMID: 18077244 PMCID: PMC2495030 DOI: 10.1098/rsif.2007.1274] [Citation(s) in RCA: 135] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
This study reports the preliminary development of a novel magnetic particle-based technique that permits the application of highly localized mechanical forces directly to specific regions of an ion-channel structure. We demonstrate that this approach can be used to directly and selectively activate a mechanosensitive ion channel of interest, namely TREK-1. It is shown that manipulation of particles targeted against the extended extracellular loop region of TREK-1 leads to changes in whole-cell currents consistent with changes in TREK-1 activity. Responses were absent when particles were coated with RGD (Arg-Gly-Asp) peptide or when magnetic fields were applied in the absence of magnetic particles. It is concluded that changes in whole-cell current are the result of direct force application to the extracellular loop region of TREK-1 and thus these results implicate this region of the channel structure in mechano-gating. It is hypothesized that the extended loop region of TREK-1 may act as a tension spring that acts to regulate sensitivity to mechanical forces, in a nature similar to that described for MscL. The development of a technique that permits the direct manipulation of mechanosensitive ion channels in real time without the need for pharmacological drugs has huge potential benefits not only for basic biological research of ion-channel gating mechanisms, but also potentially as a tool for the treatment of human diseases caused by ion-channel dysfunction.
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Affiliation(s)
- Steven Hughes
- Institute of Science and Technology in Medicine, Keele University School of Medicine, Stoke-on-Trent, Staffordshire ST4 7QB, UK
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Hughes S, Dobson J, El Haj AJ. Magnetic targeting of mechanosensors in bone cells for tissue engineering applications. J Biomech 2007; 40 Suppl 1:S96-104. [PMID: 17532323 DOI: 10.1016/j.jbiomech.2007.03.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2007] [Indexed: 11/17/2022]
Abstract
Mechanical signalling plays a pivotal role in maintaining bone cell function and remodelling of the skeleton. Our previous work has highlighted the potential role of mechano-induction in tissue engineering applications. In particular, we have highlighted the potential for using magnetic particle techniques for tissue engineering applications. Previous studies have shown that manipulation of integrin attached magnetic particles leads to changes in intracellular calcium signalling within osteoblasts. However, due to the phenomenon of particle internalisation, previous studies have typically focused on short-term stimulation experiments performed within 1-2 h of particle attachment. For tissue engineering applications, bone tissue growth occurs over a period of 3-5 weeks. To date, no study has investigated the cellular responses elicited from osteoblasts over time following stimulation with internalised magnetic particles. Here, we demonstrate the long-term biocompatibility of 4.5 microm RGD-coated particles with osteoblasts up to 21 days in culture, and detail a time course of responses elicited from osteoblasts following mechanical stimulation with integrin attached magnetic particles (<2h post attachment) and internalised particles (>48h post attachment). Mechanical manipulation of both integrin attached and internalised particles were found to induce intracellular calcium signalling. It is concluded that magnetic particles offer a tool for applying controlled mechanical forces to osteoblasts, and can be used to stimulate intracellular calcium signalling over prolonged periods of time. Magnetic particle technology presents a potentially valuable tool for tissue engineering which permits the delivery of highly localised mechano-inductive forces directly to cells.
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Affiliation(s)
- Steven Hughes
- Institute of Science and Technology in Medicine, Keele University Medical School, Hartshill Campus, Thornburrow Drive, Hartshill, Stoke-on-Trent ST4 7QB, UK
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Sengupta A, McCulloch CA. Functional Interactions of the Extracellular Matrix with Mechanosensitive Channels. CURRENT TOPICS IN MEMBRANES 2007. [DOI: 10.1016/s1063-5823(06)58007-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
Calcium transport and calcium signalling mechanisms in bone cells have, in many cases, been discovered by study of diseases with disordered bone metabolism. Calcium matrix deposition is driven primarily by phosphate production, and disorders in bone deposition include abnormalities in membrane phosphate transport such as in chondrocalcinosis, and defects in phosphate-producing enzymes such as in hypophosphatasia. Matrix removal is driven by acidification, which dissolves the mineral. Disorders in calcium removal from bone matrix by osteoclasts cause osteopetrosis. On the other hand, although bone is central to management of extracellular calcium, bone is not a major calcium sensing organ, although calcium sensing proteins are expressed in both osteoblasts and osteoclasts. Intracellular calcium signals are involved in secondary control including cellular motility and survival, but the relationship of these findings to specific diseases is not clear. Intracellular calcium signals may regulate the balance of cell survival versus proliferation or anabolic functional response as part of signalling cascades that integrate the response to primary signals via cell stretch, estrogen, tyrosine kinase, and tumor necrosis factor receptors.
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Affiliation(s)
- H C Blair
- Department of Pathology, University of Pittsburgh, PA 15261, USA
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37
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Magra M, Hughes S, El Haj AJ, Maffulli N. VOCCs and TREK-1 ion channel expression in human tenocytes. Am J Physiol Cell Physiol 2006; 292:C1053-60. [PMID: 17035301 DOI: 10.1152/ajpcell.00053.2006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Mechanosensitive and voltage-gated ion channels are known to perform important roles in mechanotransduction in a number of connective tissues, including bone and muscle. It is hypothesized that voltage-gated and mechanosensitive ion channels also may play a key role in some or all initial responses of human tenocytes to mechanical stimulation. However, to date there has been no direct investigation of ion channel expression by human tenocytes. Human tenocytes were cultured from patellar tendon samples harvested from five patients undergoing routine total knee replacement surgery (mean age: 66 yr; range: 63-73 yr). RT-PCR, Western blotting, and whole cell electrophysiological studies were performed to investigate the expression of different classes of ion channels within tenocytes. Human tenocytes expressed mRNA and protein encoding voltage-operated calcium channel (VOCC) subunits (Ca alpha(1A), Ca alpha(1C), Ca alpha(1D), Ca alpha(2)delta(1)) and the mechanosensitive tandem pore domain potassium channel (2PK(+)) TREK-1. They exhibit whole cell currents consistent with the functional expression of these channels. In addition, other ionic currents were detected within tenocytes consistent with the expression of a diverse array of other ion channels. VOCCs and TREK channels have been implicated in mechanotransduction signaling pathways in numerous connective tissue cell types. These mechanisms may be present in human tenocytes. In addition, human tenocytes may express other channel currents. Ion channels may represent potential targets for the pharmacological management of chronic tendinopathies.
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Affiliation(s)
- Merzesh Magra
- Institute for Science and Technology in Medicine, Keele University School of Medicine, Hartshill, Stoke-on-Trent, ST4 7QB, UK
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