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Radstake WE, Gautam K, Miranda S, Van Rompay C, Vermeesen R, Tabury K, Verslegers M, Dowson A, Gorissen J, van Loon JJWA, Savage NDL, Baatout S, Baselet B. Gravitational effects on fibroblasts' function in relation to wound healing. NPJ Microgravity 2023; 9:48. [PMID: 37344509 DOI: 10.1038/s41526-023-00286-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 05/25/2023] [Indexed: 06/23/2023] Open
Abstract
The spaceflight environment imposes risks for maintaining a healthy skin function as the observed delayed wound healing can contribute to increased risks of infection. To counteract delayed wound healing in space, a better understanding of the fibroblasts' reaction to altered gravity levels is needed. In this paper, we describe experiments that were carried out at the Large Diameter Centrifuge located in ESA-ESTEC as part of the ESA Academy 2021 Spin Your Thesis! Campaign. We exposed dermal fibroblasts to a set of altered gravity levels, including transitions between simulated microgravity and hypergravity. The addition of the stress hormone cortisol to the cell culture medium was done to account for possible interaction effects of gravity and cortisol exposure. Results show a main impact of cortisol on the secretion of pro-inflammatory cytokines as well as extracellular matrix proteins. Altered gravity mostly induced a delay in cellular migration and changes in mechanosensitive cell structures. Furthermore, 20 × g hypergravity transitions induced changes in nuclear morphology. These findings provide insights into the effect of gravity transitions on the fibroblasts' function related to wound healing, which may be useful for the development of countermeasures.
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Affiliation(s)
- Wilhelmina E Radstake
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000, Ghent, Belgium
| | - Kiran Gautam
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
| | - Silvana Miranda
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000, Ghent, Belgium
| | - Cynthia Van Rompay
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
| | - Randy Vermeesen
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
| | - Kevin Tabury
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
- Department of Biomedical Engineering, University of South Carolina, Columbia, SC, 29208, USA
| | - Mieke Verslegers
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
| | - Alan Dowson
- Serco Nederland for the European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), TEC-MMG, Keplerlaan 1, 2201, AZ, Noordwijk, the Netherlands
| | | | - Jack J W A van Loon
- ESA/ESTEC, Keplerlaan 1, 2200, AZ, Noordwijk, The Netherlands
- Department of Oral and Maxillofacial Surgery/Pathology, Amsterdam Movement Sciences & Amsterdam Bone Center (ABC), Amsterdam UMC location Vrije Universiteit Amsterdam & Academic Center for Dentistry Amsterdam (ACTA), Gustav Mahlerlaan 3004, 1081, LA, Amsterdam, The Netherlands
| | - Nigel D L Savage
- HE Space Operations for the European Space Agency, ESA/ESTEC, Keplerlaan 1, 2200, AZ, Noordwijk, The Netherlands
| | - Sarah Baatout
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000, Ghent, Belgium
| | - Bjorn Baselet
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium.
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2
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The P2X7 Receptor in the Maintenance of Cancer Stem Cells, Chemoresistance and Metastasis. Stem Cell Rev Rep 2021; 16:288-300. [PMID: 31813120 DOI: 10.1007/s12015-019-09936-w] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Metastasis is the worst prognosis predictor in the clinical course of cancer development. Features of metastatic cancer cells include migratory ability, low degree of differentiation, self-renewal and proliferation potentials, as well as resistance to therapies. Metastatic cells do not present all of the necessary characteristics at once. Indeed, they have a unique phenotypic plasticity, allowing the acquisition of features that make them successful in all steps of metastasis. Cancer stem cells (CSC), the most undifferentiated cells in the tumor mass, display highest metastatic potential and resistance to radio- and chemotherapy. Growing tumors exhibit marked upregulation of P2X7 receptor expression and secrete ATP. Since the P2X7 receptor plays an important role in the maintenance of undifferentiated state of pluripotent cells, its importance on cell fate regulation in the tumor mass is suggested. Considering the extensive crosstalk between CSCs, epithelial-mesenchymal transition, drug resistance and metastasis, current knowledge implicating P2X7 receptor function in these phenomena and new avenues for therapeutic strategies to control metastasis are reviewed.
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3
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Eckert J, van Loon JJWA, Eng LM, Schmidt T. Hypergravity affects cell traction forces of fibroblasts. Biophys J 2021; 120:773-780. [PMID: 33657362 DOI: 10.1016/j.bpj.2021.01.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 12/24/2020] [Accepted: 01/08/2021] [Indexed: 11/18/2022] Open
Abstract
Cells sense and react on changes of the mechanical properties of their environment and, likewise, respond to external mechanical stress applied to them. However, whether the gravitational field as overall body force modulates cellular behavior is unclear. Different studies demonstrated that micro- and hypergravity influences the shape and elasticity of cells, initiate cytoskeleton reorganization, and influence cell motility. All these cellular properties are interconnected and contribute to forces that cells apply on their surrounding microenvironment. Yet, studies that investigated changes of cell traction forces under hypergravity conditions are scarce. Here, we performed hypergravity experiments on 3T3 fibroblast cells using the large-diameter centrifuge at the European Space Agency - European Space Research and Technology Centre. Cells were exposed to hypergravity of up to 19.5 g for 16 h in both the upright and the inverted orientation with respect to the g-force vector. We observed a decrease in cellular traction forces when the gravitational field was increased up to 5.4 g, followed by an increase of traction forces for higher gravity fields up to 19.5 g independent of the orientation of the gravity vector. We attribute the switch in cellular response to shear thinning at low g-forces, followed by significant rearrangement and enforcement of the cytoskeleton at high g-forces.
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Affiliation(s)
- Julia Eckert
- Physics of Life Processes, Leiden Institute of Physics, Leiden University, Leiden, the Netherlands; School of Science, Department of Physics, Technische Universität Dresden, Dresden, Germany; Life & Physical Science, Instrumentation and Life Support Laboratory, ESA/ESTEC, Noordwijk, the Netherlands
| | - Jack J W A van Loon
- Life & Physical Science, Instrumentation and Life Support Laboratory, ESA/ESTEC, Noordwijk, the Netherlands; Dutch Experiment Support Centre, Department of Oral and Maxillofacial Surgery/Oral Pathology, Amsterdam University Medical Centre, location VUmc & Academic Centre for Dentistry Amsterdam, Amsterdam, the Netherlands
| | - Lukas M Eng
- School of Science, Department of Physics, Technische Universität Dresden, Dresden, Germany
| | - Thomas Schmidt
- Physics of Life Processes, Leiden Institute of Physics, Leiden University, Leiden, the Netherlands.
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4
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Hypergravity Activates a Pro-Angiogenic Homeostatic Response by Human Capillary Endothelial Cells. Int J Mol Sci 2020; 21:ijms21072354. [PMID: 32231163 PMCID: PMC7177524 DOI: 10.3390/ijms21072354] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/23/2020] [Accepted: 03/25/2020] [Indexed: 12/15/2022] Open
Abstract
Capillary endothelial cells are responsible for homeostatic responses to organismic and environmental stimulations. When malfunctioning, they may cause disease. Exposure to microgravity is known to have negative effects on astronauts’ physiology, the endothelium being a particularly sensitive organ. Microgravity-related dysfunctions are striking similar to the consequences of sedentary life, bed rest, and ageing on Earth. Among different countermeasures implemented to minimize the effects of microgravity, a promising one is artificial gravity. We examined the effects of hypergravity on human microvascular endothelial cells of dermal capillary origin (HMEC-1) treated at 4 g for 15 min, and at 20 g for 15 min, 3 and 6 h. We evaluated cell morphology, gene expression and 2D motility and function. We found a profound rearrangement of the cytoskeleton network, dose-dependent increase of Focal Adhesion kinase (FAK) phosphorylation and Yes-associated protein 1 (YAP1) expression, suggesting cell stiffening and increased proneness to motility. Transcriptome analysis showed expression changes of genes associated with cardiovascular homeostasis, nitric oxide production, angiogenesis, and inflammation. Hypergravity-treated cells also showed significantly improved motility and function (2D migration and tube formation). These results, expanding our knowledge about the homeostatic response of capillary endothelial cells, show that adaptation to hypergravity has opposite effect compared to microgravity on the same cell type.
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5
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Li N, Wang C, Sun S, Zhang C, Lü D, Chen Q, Long M. Microgravity-Induced Alterations of Inflammation-Related Mechanotransduction in Endothelial Cells on Board SJ-10 Satellite. Front Physiol 2018; 9:1025. [PMID: 30108515 PMCID: PMC6079262 DOI: 10.3389/fphys.2018.01025] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 07/11/2018] [Indexed: 12/19/2022] Open
Abstract
Endothelial cells (ECs) are mechanosensitive cells undergoing morphological and functional changes in space. Ground-based study has provided a body of evidences about how ECs can respond to the effect of simulated microgravity, however, these results need to be confirmed by spaceflight experiments in real microgravity. In this work, we cultured EA.hy926 ECs on board the SJ-10 Recoverable Scientific Satellite for 3 and 10 days, and analyzed the effects of space microgravity on the ECs. Space microgravity suppressed the glucose metabolism, modulated the expression of cellular adhesive molecules such as ICAM-1, VCAM-1, and CD44, and depressed the pro-angiogenesis and pro-inflammation cytokine secretion. Meanwhile, it also induced the depolymerization of actin filaments and microtubules, promoted the vimentin accumulation, restrained the collagen I and fibronectin deposition, regulated the mechanotransduction through focal adhesion kinase and Rho GTPases, and enhanced the exosome-mediated mRNA transfer. Unlike the effect of simulated microgravity, neither three-dimensional growth nor enhanced nitric oxide production was observed in our experimental settings. This work furthers the understandings in the effects and mechanisms of space microgravity on ECs, and provides useful information for future spaceflight experimental design.
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Affiliation(s)
- Ning Li
- Key Laboratory of Microgravity - National Microgravity Laboratory, Center of Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.,School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Chengzhi Wang
- Key Laboratory of Microgravity - National Microgravity Laboratory, Center of Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.,School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Shujin Sun
- Key Laboratory of Microgravity - National Microgravity Laboratory, Center of Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.,School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Chen Zhang
- Key Laboratory of Microgravity - National Microgravity Laboratory, Center of Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.,School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Dongyuan Lü
- Key Laboratory of Microgravity - National Microgravity Laboratory, Center of Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.,School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Qin Chen
- Key Laboratory of Microgravity - National Microgravity Laboratory, Center of Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.,School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Mian Long
- Key Laboratory of Microgravity - National Microgravity Laboratory, Center of Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.,School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
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6
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Kim D, Kwon S. Mechanical load increase-induced changes in cytoskeletal structure and cellular barrier function in human cerebral endothelial cells. Biotechnol Bioeng 2018; 115:2624-2631. [PMID: 29896880 DOI: 10.1002/bit.26742] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 06/06/2018] [Accepted: 06/08/2018] [Indexed: 11/09/2022]
Abstract
Globally, approximately a billion patients are estimated to suffer from neurological disorders. Although there are many therapeutic candidates for the central nervous system, treatment of brain disorders is restricted by the blood-brain barrier (BBB), which is a highly selective membrane that protects the brain from exogenous substances. This study was undertaken to develop a novel strategy to overcome the BBB and improve the efficiency of drug delivery to the brain by mechanical load increase using hypergravity. Human cerebral microvascular endothelial cells were exposed three times to 20 min hypergravity (10g), with a 20-min rest period between each exposure. The applied hypergravity reversibly decreased the cellular metabolic activity and increased the permeation rate of fluorescein sodium salt, fluorescein isothiocyanate-labeled dextran (FD-4), and fluorescein-labeled jacalin. Following the exposure to hypergravity, we also observed structural changes of the cytoskeleton and tight junctions, and an alteration in the expression levels of related genes. These results indicate that increased mechanical load due to the applied hypergravity affects the cytoskeletal arrangement and tight junctions, thereby weakening the cell barrier function and enhancing the permeability of the paracellular pathway. Thus, the mechanical load increase by hypergravity has the potential of being used as a novel strategy to overcome the BBB for brain drug delivery.
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Affiliation(s)
- Dongjoo Kim
- Department of Biological Engineering, Inha University, Incheon, South Korea
| | - Soonjo Kwon
- Department of Biological Engineering, Inha University, Incheon, South Korea
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7
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Enhanced nasal drug delivery efficiency by increasing mechanical loading using hypergravity. Sci Rep 2018; 8:168. [PMID: 29317727 PMCID: PMC5760728 DOI: 10.1038/s41598-017-18561-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 12/13/2017] [Indexed: 02/07/2023] Open
Abstract
Nasal route drug administration for local and systemic delivery of many therapeutics has received attention because the nasal cavity is highly vascularized and provides a large surface area for drug absorption. However, nasal mucosa exhibits limited permeability to polar molecules. In this study, we developed a novel method for improving absorption efficiency of polar drugs by applying hypergravity. RPMI 2650 cells and primary human nasal epithelial cells were exposed three times to a 20 min hypergravitational condition (10 × g) with a 20 min rest period after each exposure. The applied hypergravity induced a decrease in transepithelial electrical resistance without significant loss of cellular metabolic activity, and cellular permeability of fluorescein sodium salt (MW 376 Da; NaFI) and FITC-labeled dextran (average MW 4,000 Da; FD-4) increased by 19% and 16%, respectively. Immunostaining and RT-qPCR results demonstrated that hypergravity conditions affected cytoskeletal structures and tight junctions, leading to weakening of the cell barrier function and increasing the cellular permeability of polar molecules. Our results indicate that hypergravity could be used as a new strategy for enhancing the efficiency of drug absorption via the nasal route.
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8
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Costa-Almeida R, Carvalho DTO, Ferreira MJS, Aresta G, Gomes ME, van Loon JJWA, Van der Heiden K, Granja PL. Effects of hypergravity on the angiogenic potential of endothelial cells. J R Soc Interface 2017; 13:rsif.2016.0688. [PMID: 28334696 DOI: 10.1098/rsif.2016.0688] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Accepted: 10/17/2016] [Indexed: 01/05/2023] Open
Abstract
Angiogenesis, the formation of blood vessels from pre-existing ones, is a key event in pathology, including cancer progression, but also in homeostasis and regeneration. As the phenotype of endothelial cells (ECs) is continuously regulated by local biomechanical forces, studying endothelial behaviour in altered gravity might contribute to new insights towards angiogenesis modulation. This study aimed at characterizing EC behaviour after hypergravity exposure (more than 1g), with special focus on cytoskeleton architecture and capillary-like structure formation. Herein, human umbilical vein ECs (HUVECs) were cultured under two-dimensional and three-dimensional conditions at 3g and 10g for 4 and 16 h inside the large diameter centrifuge at the European Space Research and Technology Centre (ESTEC) of the European Space Agency. Although no significant tendency regarding cytoskeleton organization was observed for cells exposed to high g's, a slight loss of the perinuclear localization of β-tubulin was observed for cells exposed to 3g with less pronounced peripheral bodies of actin when compared with 1g control cells. Additionally, hypergravity exposure decreased the assembly of HUVECs into capillary-like structures, with a 10g level significantly reducing their organization capacity. In conclusion, short-term hypergravity seems to affect EC phenotype and their angiogenic potential in a time and g-level-dependent manner.
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Affiliation(s)
- Raquel Costa-Almeida
- 3B's Research Group-Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Daniel T O Carvalho
- i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal.,INEB-Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal.,ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal.,FEUP-Faculade de Engenharia, Universidade do Porto, Portugal
| | - Miguel J S Ferreira
- i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal.,INEB-Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal.,ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal.,FEUP-Faculade de Engenharia, Universidade do Porto, Portugal
| | - Guilherme Aresta
- ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal.,FEUP-Faculade de Engenharia, Universidade do Porto, Portugal
| | - Manuela E Gomes
- 3B's Research Group-Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Jack J W A van Loon
- Department of Oral and Maxillofacial Surgery/Oral Pathology, VU-University Medical Center, Amsterdam, The Netherlands.,ESTEC, TEC-MMG-Lab, European Space Agency (ESA), Noordwijk, The Netherlands
| | - Kim Van der Heiden
- Department of Biomedical Engineering, ErasmusMC, Rotterdam, The Netherlands
| | - Pedro L Granja
- i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal .,INEB-Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal.,ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal.,FEUP-Faculade de Engenharia, Universidade do Porto, Portugal
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9
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Hosamani R, Leib R, Bhardwaj SR, Adams CM, Bhattacharya S. Elucidating the "Gravome": Quantitative Proteomic Profiling of the Response to Chronic Hypergravity in Drosophila. J Proteome Res 2016; 15:4165-4175. [PMID: 27648494 DOI: 10.1021/acs.jproteome.6b00030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Altered gravity conditions, such as experienced by organisms during spaceflight, are known to cause transcriptomic and proteomic changes. We describe the proteomic changes in whole adult Drosophila melanogaster (fruit fly) but focus specifically on the localized changes in the adult head in response to chronic hypergravity (3 g) treatment. Canton S adult female flies (2 to 3 days old) were exposed to chronic hypergravity for 9 days and compared with 1 g controls. After hypergravity treatment, either whole flies (body + head) or fly-head-only samples were isolated and evaluated for quantitative comparison of the two gravity conditions using an isobaric tagging liquid chromatography-tandem mass spectrometry approach. A total of 1948 proteins from whole flies and 1480 proteins from fly heads were differentially present in hypergravity-treated flies. Gene Ontology analysis of head-specific proteomics revealed host immune response, and humoral stress proteins were significantly upregulated. Proteins related to calcium regulation, ion transport, and ATPase were decreased. Increased expression of cuticular proteins may suggest an alteration in chitin metabolism and in chitin-based cuticle development. We therefore present a comprehensive quantitative survey of proteomic changes in response to chronic hypergravity in Drosophila, which will help elucidate the underlying molecular mechanism(s) associated with altered gravity environments.
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Affiliation(s)
- Ravikumar Hosamani
- Space Biosciences Division, NASA Ames Research Center , Moffett Field, California 94035, United States
| | - Ryan Leib
- Stanford University Mass Spectrometry (SUMS) , Palo Alto, California 94305, United States
| | - Shilpa R Bhardwaj
- Space Biosciences Division, NASA Ames Research Center , Moffett Field, California 94035, United States
| | - Christopher M Adams
- Stanford University Mass Spectrometry (SUMS) , Palo Alto, California 94305, United States
| | - Sharmila Bhattacharya
- Space Biosciences Division, NASA Ames Research Center , Moffett Field, California 94035, United States
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10
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Szulcek R, van Bezu J, Boonstra J, van Loon JJWA, van Nieuw Amerongen GP. Transient Intervals of Hyper-Gravity Enhance Endothelial Barrier Integrity: Impact of Mechanical and Gravitational Forces Measured Electrically. PLoS One 2015; 10:e0144269. [PMID: 26637177 PMCID: PMC4670102 DOI: 10.1371/journal.pone.0144269] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 11/16/2015] [Indexed: 11/24/2022] Open
Abstract
Background Endothelial cells (EC) guard vascular functions by forming a dynamic barrier throughout the vascular system that sensitively adapts to ‘classical’ biomechanical forces, such as fluid shear stress and hydrostatic pressure. Alterations in gravitational forces might similarly affect EC integrity, but remain insufficiently studied. Methods In an unique approach, we utilized Electric Cell-substrate Impedance Sensing (ECIS) in the gravity-simulators at the European Space Agency (ESA) to study dynamic responses of human EC to simulated micro- and hyper-gravity as well as to classical forces. Results Short intervals of micro- or hyper-gravity evoked distinct endothelial responses. Stimulated micro-gravity led to decreased endothelial barrier integrity, whereas hyper-gravity caused sustained barrier enhancement by rapid improvement of cell-cell integrity, evidenced by a significant junctional accumulation of VE-cadherin (p = 0.011), significant enforcement of peripheral F-actin (p = 0.008) and accompanied by a slower enhancement of cell-matrix interactions. The hyper-gravity triggered EC responses were force dependent and nitric-oxide (NO) mediated showing a maximal resistance increase of 29.2±4.8 ohms at 2g and 60.9±6.2 ohms at 4g vs. baseline values that was significantly suppressed by NO blockage (p = 0.011). Conclusion In conclusion, short-term application of hyper-gravity caused a sustained improvement of endothelial barrier integrity, whereas simulated micro-gravity weakened the endothelium. In clear contrast, classical forces of shear stress and hydrostatic pressure induced either short-lived or no changes to the EC barrier. Here, ECIS has proven a powerful tool to characterize subtle and distinct EC gravity-responses due to its high temporal resolution, wherefore ECIS has a great potential for the study of gravity-responses such as in real space flights providing quantitative assessment of a variety of cell biological characteristics of any adherent growing cell type in an automated and continuous fashion.
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Affiliation(s)
- Robert Szulcek
- Department of Physiology, Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
- Department of Pulmonology, Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
- * E-mail:
| | - Jan van Bezu
- Department of Physiology, Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Johannes Boonstra
- Deptartment of Cellular Architecture and Dynamics, Science Faculty, Utrecht University, Utrecht, The Netherlands
| | - Jack J. W. A. van Loon
- Dutch Experiment Support Center (DESC), ESTEC, TEC-MMG-Lab, European Space Agency (ESA), Noordwijk, The Netherlands
- Department of Oral and Maxillofacial Surgery/Oral Pathology, VU University Medical Center, Amsterdam, The Netherlands
- Department of Oral Cell Biology, Academic Centre for Dentistry (ACTA), Amsterdam, The Netherlands
| | - Geerten P. van Nieuw Amerongen
- Department of Physiology, Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
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11
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The impact of microgravity and hypergravity on endothelial cells. BIOMED RESEARCH INTERNATIONAL 2015; 2015:434803. [PMID: 25654101 PMCID: PMC4309246 DOI: 10.1155/2015/434803] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 10/20/2014] [Accepted: 11/04/2014] [Indexed: 12/18/2022]
Abstract
The endothelial cells (ECs), which line the inner surface of vessels, play a fundamental role in maintaining vascular integrity and tissue homeostasis, since they regulate local blood flow and other physiological processes. ECs are highly sensitive to mechanical stress, including hypergravity and microgravity. Indeed, they undergo morphological and functional changes in response to alterations of gravity. In particular microgravity leads to changes in the production and expression of vasoactive and inflammatory mediators and adhesion molecules, which mainly result from changes in the remodelling of the cytoskeleton and the distribution of caveolae. These molecular modifications finely control cell survival, proliferation, apoptosis, migration, and angiogenesis. This review summarizes the state of the art on how microgravity and hypergravity affect cultured ECs functions and discusses some controversial issues reported in the literature.
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12
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Toll-like receptor-triggered calcium mobilization protects mice against bacterial infection through extracellular ATP release. Infect Immun 2014; 82:5076-85. [PMID: 25245808 DOI: 10.1128/iai.02546-14] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Extracellular ATP (eATP), released as a "danger signal" by injured or stressed cells, plays an important role in the regulation of immune responses, but the relationship between ATP release and innate immune responses is still uncertain. In this study, we demonstrated that ATP was released through Toll-like receptor (TLR)-associated signaling in both Escherichia coli-infected mice and lipopolysaccharide (LPS)- or Pam3CSK4-treated macrophages. This ATP release could be blocked completely only by N-ethylmaleimide (NEM), not by carbenoxolone (CBX), flufenamic acid (FFA), or probenecid, suggesting the key role of exocytosis in this process. Furthermore, LPS-induced ATP release could also be reduced dramatically through suppressing calcium mobilization by use of U73122, caffeine, and thapsigargin (TG). In addition, the secretion of interleukin-1β (IL-1β) and CCL-2 was enhanced significantly by ATP, in a time- and dose-dependent manner. Meanwhile, macrophage-mediated phagocytosis of bacteria was also promoted significantly by ATP stimulation. Furthermore, extracellular ATP reduced the number of invading bacteria and protected mice from peritonitis by activating purinergic receptors. Mechanistically, phosphorylation of AKT and ERK was overtly increased by ATP in antibacterial immune responses. Accordingly, if we blocked the P2X- and P2Y-associated signaling pathway by using suramin and pyridoxal phosphate-6-azo(benzene-2,4-disulfonic acid), tetrasodium salt (PPADS), the ATP-enhanced immune response was restrained significantly. Taken together, our findings reveal an internal relationship between danger signals and TLR signaling in innate immune responses, which suggests a potential therapeutic significance of calcium mobilization-mediated ATP release in infectious diseases.
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13
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Rubenstein DA, Yin W. Hypergravity and Hypobaric Hypoxic Conditions Promote Endothelial Cell and Platelet Activation. High Alt Med Biol 2014; 15:396-405. [DOI: 10.1089/ham.2013.1139] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- David A. Rubenstein
- Work completed at School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma
- Present address: Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York
| | - Wei Yin
- Work completed at School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma
- Present address: Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York
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14
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Joseph EK, Green PG, Levine JD. ATP release mechanisms of endothelial cell-mediated stimulus-dependent hyperalgesia. THE JOURNAL OF PAIN 2014; 15:771-7. [PMID: 24793242 PMCID: PMC4264525 DOI: 10.1016/j.jpain.2014.04.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Revised: 03/25/2014] [Accepted: 04/08/2014] [Indexed: 01/06/2023]
Abstract
UNLABELLED Endothelin-1 (ET-1) acts on endothelial cells to enhance mechanical stimulation-induced release of adenosine triphosphate (ATP), which in turn can act on sensory neurons innervating blood vessels to contribute to vascular pain, a phenomenon we have referred to as stimulus-dependent hyperalgesia (SDH). In the present study, we evaluated the role of the major classes of ATP release mechanisms to SDH: vesicular exocytosis, plasma membrane-associated ATP synthase, ATP-binding cassette transporters, and ion channels. Inhibitors of vesicular exocytosis (ie, monensin, brefeldin A, and bafilomycin), plasma membrane-associated ATPase (ie, oligomycin and pigment epithelium-derived factor peptide 34-mer), and connexin ion channels (carbenoxolone and flufenamic acid) but not ATP-binding cassette transporter (ie, dipyridamole, nicardipine, or CFTRinh-172) attenuated SDH. This study reports a role of ATP in SDH and suggests novel targets for the treatment of vascular pain syndromes. PERSPECTIVE ET-1 acts on endothelial cells to produce mechanical stimulation-induced hyperalgesia. Inhibitors of 3 different ATP release mechanisms attenuated this SDH. This study provides support for a role of ATP in SDH and suggests novel targets for the treatment of vascular pain syndromes.
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Affiliation(s)
- Elizabeth K Joseph
- Departments of Medicine and Oral & Maxillofacial Surgery, and Division of Neuroscience, University of California at San Francisco, San Francisco, California
| | - Paul G Green
- Departments of Medicine and Oral & Maxillofacial Surgery, and Division of Neuroscience, University of California at San Francisco, San Francisco, California
| | - Jon D Levine
- Departments of Medicine and Oral & Maxillofacial Surgery, and Division of Neuroscience, University of California at San Francisco, San Francisco, California.
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15
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Langevin HM, Fujita T, Bouffard NA, Takano T, Koptiuch C, Badger GJ, Nedergaard M. Fibroblast cytoskeletal remodeling induced by tissue stretch involves ATP signaling. J Cell Physiol 2013; 228:1922-6. [PMID: 23460361 DOI: 10.1002/jcp.24356] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Accepted: 02/12/2013] [Indexed: 12/16/2022]
Abstract
Fibroblasts in whole areolar connective tissue respond to static stretching of the tissue by expanding and remodeling their cytoskeleton within minutes both ex vivo and in vivo. This study tested the hypothesis that the mechanism of fibroblast expansion in response to tissue stretch involves extracellular ATP signaling. In response to tissue stretch ex vivo, ATP levels in the bath solution increased significantly, and this increase was sustained for 20 min, returning to baseline at 60 min. No increase in ATP was observed in tissue incubated without stretch or tissue stretched in the presence of the Rho kinase inhibitor Y27632. The increase in fibroblast cross sectional area in response to tissue stretch was blocked by both suramin (a purinergic receptor blocker) and apyrase (an enzyme that selectively degrades extracellular ATP). Furthermore, connexin channel blockers (octanol and carbenoxolone), but not VRAC (fluoxetine) or pannexin (probenecid) channel blockers, inhibited fibroblast expansion. Together, these results support a mechanism in which extracellular ATP signaling via connexin hemichannels mediate the active change in fibroblast shape that occurs in response to a static increase in tissue length.
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Affiliation(s)
- Helene M Langevin
- Department of Neurological Sciences, University of Vermont, Burlington, Vermont 05405, USA.
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16
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Corriden R, Insel PA. New insights regarding the regulation of chemotaxis by nucleotides, adenosine, and their receptors. Purinergic Signal 2012; 8:587-98. [PMID: 22528684 PMCID: PMC3360098 DOI: 10.1007/s11302-012-9311-x] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 01/05/2012] [Indexed: 12/23/2022] Open
Abstract
The directional movement of cells can be regulated by ATP, certain other nucleotides (e.g., ADP, UTP), and adenosine. Such regulation occurs for cells that are "professional phagocytes" (e.g., neutrophils, macrophages, certain lymphocytes, and microglia) and that undergo directional migration and subsequent phagocytosis. Numerous other cell types (e.g., fibroblasts, endothelial cells, neurons, and keratinocytes) also change motility and migration in response to ATP, other nucleotides, and adenosine. In this article, we review how nucleotides and adenosine modulate chemotaxis and motility and highlight the importance of nucleotide- and adenosine-regulated cell migration in several cell types: neutrophils, microglia, endothelial cells, and cancer cells. We also discuss difficulties in conducting experiments and drawing conclusions regarding the ability of nucleotides and adenosine to modulate the migration of professional and non-professional phagocytes.
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Affiliation(s)
- Ross Corriden
- Institute of Cell Signalling, University of Nottingham, Nottingham, UK
| | - Paul A. Insel
- Departments of Pharmacology and Medicine, University of California, San Diego, CA USA
- Department of Pharmacology, University of California San Diego, 9500 Gilman Drive, Mail code 0636, La Jolla, CA 92093 USA
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17
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Ciofani G, Ricotti L, Rigosa J, Menciassi A, Mattoli V, Monici M. Hypergravity effects on myoblast proliferation and differentiation. J Biosci Bioeng 2011; 113:258-61. [PMID: 22055920 DOI: 10.1016/j.jbiosc.2011.09.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 09/29/2011] [Accepted: 09/30/2011] [Indexed: 10/15/2022]
Abstract
This study aimed at the investigation of behavior of myoblasts in conditions of altered gravity. C2C12 cells underwent stimulations by different hypergravity intensities (2 h at 5 g, 10 g, and 20 g) in the Large Diameter Centrifuge of the European Space Agency (ESA), highlighting positive effects on both proliferation and differentiation.
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Affiliation(s)
- Gianni Ciofani
- Italian Institute of Technology, Center of MicroBioRobotics c/o Scuola Superiore Sant'Anna, Viale Rinaldo Piaggio 34, 56025 Pontedera (Pisa), Italy. ,
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18
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Cell adhesion to plasma electrolytic oxidation (PEO) titania coatings, assessed using a centrifuging technique. J Mech Behav Biomed Mater 2011; 4:2103-12. [DOI: 10.1016/j.jmbbm.2011.07.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2011] [Revised: 07/12/2011] [Accepted: 07/18/2011] [Indexed: 10/18/2022]
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19
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Li S, Shi Q, Liu G, Zhang W, Wang Z, Wang Y, Dai K. Mechanism of platelet functional changes and effects of anti-platelet agents on in vivo hemostasis under different gravity conditions. J Appl Physiol (1985) 2010; 108:1241-9. [PMID: 20133435 DOI: 10.1152/japplphysiol.01209.2009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Serious thrombotic and hemorrhagic problems or even fatalities evoked by either microgravity or hypergravity occur commonly in the world. We recently reported that platelet functions are inhibited in microgravity environments and activated under high-G conditions, which reveals the pathogenesis for gravity change-related hemorrhagic and thrombotic diseases. However, the mechanisms of platelet functional variations under different gravity conditions remain unclear. In this study we show that the amount of filamin A coimmunoprecipitated with GPIbalpha was enhanced in platelets exposed to modeled microgravity and, in contrast, was reduced in 8 G-exposed platelets. Hypergravity induced actin filament formation and redistribution, whereas actin filaments were reduced in platelets treated with modeled microgravity. Furthermore, intracellular Ca2+ levels were elevated by hypergravity. Pretreatment of platelets with the cell-permeable Ca2+ chelator BAPTA-AM had no effect on cytoskeleton reorganization induced by hypergravity but significantly reduced platelet aggregation induced by ristocetin/hypergravity. Two anti-platelet agents, aspirin and tirofiban, effectively reversed the shortened tail bleeding time and reduced the death rate of mice exposed to hypergravity. Furthermore, the increased P-selectin surface expression was obviously reduced in platelets from mice treated with aspirin/hypergravity compared with those from mice treated with hypergravity alone. These data suggest that the actin cytoskeleton reorganization and intracellular Ca2+ level play key roles in the regulation of platelet functions in different gravitational environments. The results with anti-platelet agents not only further confirm the activation of platelets in vivo but also suggest a therapeutic potential for hypergravity-induced thrombotic diseases.
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Affiliation(s)
- Suping Li
- School of Biological Science and Medical Engineering, Beihang University, 37 Xueyuan Road, Haidian district, Beijing 100083, China
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20
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Corriden R, Insel PA. Basal release of ATP: an autocrine-paracrine mechanism for cell regulation. Sci Signal 2010; 3:re1. [PMID: 20068232 DOI: 10.1126/scisignal.3104re1] [Citation(s) in RCA: 263] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Cells release adenosine triphosphate (ATP), which activates plasma membrane-localized P2X and P2Y receptors and thereby modulates cellular function in an autocrine or paracrine manner. Release of ATP and the subsequent activation of P2 receptors help establish the basal level of activation (sometimes termed "the set point") for signal transduction pathways and regulate a wide array of responses that include tissue blood flow, ion transport, cell volume regulation, neuronal signaling, and host-pathogen interactions. Basal release and autocrine or paracrine responses to ATP are multifunctional, evolutionarily conserved, and provide an economical means for the modulation of cell, tissue, and organismal biology.
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Affiliation(s)
- Ross Corriden
- Departments of Pharmacology and Medicine, University of California, San Diego, La Jolla, CA 92093, USA
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21
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Weerasinghe RR, Swanson SJ, Okada SF, Garrett MB, Kim SY, Stacey G, Boucher RC, Gilroy S, Jones AM. Touch induces ATP release in Arabidopsis roots that is modulated by the heterotrimeric G-protein complex. FEBS Lett 2009; 583:2521-6. [PMID: 19596005 DOI: 10.1016/j.febslet.2009.07.007] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2009] [Revised: 07/02/2009] [Accepted: 07/07/2009] [Indexed: 11/17/2022]
Abstract
Amongst the many stimuli orienting the growth of plant roots, of critical importance are the touch signals generated as roots explore the mechanically complex soil environment. However, the molecular mechanisms behind these sensory events remain poorly defined. We report an impaired obstacle-avoiding response of roots in Arabidopsis lacking a heterotrimeric G-protein. Obstacle avoidance may utilize a touch-induced release of ATP to the extracellular space. While sequential touch stimulation revealed a strong refractory period for ATP release in response to mechano-stimulation in wild-type plants, the refractory period in mutants was attenuated, resulting in extracellular ATP accumulation. We propose that ATP acts as an extracellular signal released by mechano-stimulation and that the G-protein complex is needed for fine-tuning this response.
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