1
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Mohanta S, Das NK, Goswami C. Taxol-treatment alters endogenous TRPV1 expression and mitochondrial membrane potential in mesenchymal stem cells: Relevant in chemotherapy-induced pathophysiology. Biochem Biophys Res Commun 2024; 737:150498. [PMID: 39128224 DOI: 10.1016/j.bbrc.2024.150498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2024] [Accepted: 08/02/2024] [Indexed: 08/13/2024]
Abstract
Microtubule-based chemotherapeutics, primarily Taxane-derived agents are still used as the major live-saving agents, yet have several side effects including serious loss of immune cells, bone density etc. which lowers the quality of life. This imposes the need to understand the effects of these agents on Mesenchymal Stem Cells (MSCs) in details. In this work we demonstrate that Taxol and Nocodazole affects the endogenous expression of TRPV1, a non-selective cation channel in MSCs. These agents also affect the status of polymerized Actin as well as Tyrosinated-tubulin, basal cytosolic Ca2+ and mitochondrial membrane potential (ΔΨm). Notably, pharmacological modulation of TRPV1 by Capsaicin or Capsazepine can also alter the above-mentioned parameters in a context-dependent manner. We suggest that endogenous expression of TRPV1 and pharmacological modulation of TRPV1 can be utilized to rescue some of these parameters effectively. These findings may have significance in the treatments and strategies with Microtubule-based chemotherapeutics and stem-cell based therapy.
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Affiliation(s)
- Sushama Mohanta
- School of Biological Sciences, National Institute of Science Education and Research, Khurda, Odisha, 752050, India; Homi Bhabha National Institute, Mumbai, 400094, India
| | - Nilesh Kumar Das
- School of Biological Sciences, National Institute of Science Education and Research, Khurda, Odisha, 752050, India; Homi Bhabha National Institute, Mumbai, 400094, India
| | - Chandan Goswami
- School of Biological Sciences, National Institute of Science Education and Research, Khurda, Odisha, 752050, India; Homi Bhabha National Institute, Mumbai, 400094, India.
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2
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Dong ZS, Zhang XR, Xue DZ, Liu JH, Yi F, Zhang YY, Xian FY, Qiao RY, Liu BY, Zhang HL, Wang C. FGF13 enhances the function of TRPV1 by stabilizing microtubules and regulates acute and chronic itch. FASEB J 2024; 38:e23661. [PMID: 38733310 DOI: 10.1096/fj.202400096r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 04/08/2024] [Accepted: 04/29/2024] [Indexed: 05/13/2024]
Abstract
Itching is an aversive somatosensation that triggers the desire to scratch. Transient receptor potential (TRP) channel proteins are key players in acute and chronic itch. However, whether the modulatory effect of fibroblast growth factor 13 (FGF13) on acute and chronic itch is associated with TRP channel proteins is unclear. Here, we demonstrated that conditional knockout of Fgf13 in dorsal root ganglion neurons induced significant impairment in scratching behaviors in response to acute histamine-dependent and chronic dry skin itch models. Furthermore, FGF13 selectively regulated the function of the TRPV1, but not the TRPA1 channel on Ca2+ imaging and electrophysiological recordings, as demonstrated by a significant reduction in neuronal excitability and current density induced by TRPV1 channel activation, whereas TRPA1 channel activation had no effect. Changes in channel currents were also verified in HEK cell lines. Subsequently, we observed that selective modulation of TRPV1 by FGF13 required its microtubule-stabilizing effect. Furthermore, in FGF13 knockout mice, only the overexpression of FGF13 with a tubulin-binding domain could rescue TRP channel function and the impaired itch behavior. Our findings reveal a novel mechanism by which FGF13 is involved in TRPV1-dependent itch transduction and provide valuable clues for alleviating pathological itch syndrome.
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Affiliation(s)
- Zi-Shan Dong
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
| | - Xue-Rou Zhang
- Graduate School, Hebei Medical University, Shijiazhuang, China
| | - Da-Zhong Xue
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
- Department of Forensic Medicine, Hebei North University, Zhangjiakou, China
| | - Jia-Hui Liu
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
| | - Fan Yi
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
| | - Yi-Yi Zhang
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
| | - Fu-Yu Xian
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
| | - Ruo-Yang Qiao
- College of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Bo-Yi Liu
- Department of Neurobiology and Acupuncture Research, The Third Clinical Medical College, Zhejiang Chinese Medical University, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Hangzhou, China
| | - Hai-Lin Zhang
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
| | - Chuan Wang
- Department of Pharmacology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, The Key Laboratory of New Drug Pharmacology and Toxicology, The Hebei Collaboration Innovation Center for Mechanism, Diagnosis and Treatment of Neurological and Psychiatric Disease, Hebei Medical University, Shijiazhuang, China
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3
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Das R, Bhattacharjee S, Letcher JM, Harris JM, Nanda S, Foldi I, Lottes EN, Bobo HM, Grantier BD, Mihály J, Ascoli GA, Cox DN. Formin 3 directs dendritic architecture via microtubule regulation and is required for somatosensory nociceptive behavior. Development 2021; 148:271101. [PMID: 34322714 DOI: 10.1242/dev.187609] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 07/12/2021] [Indexed: 01/26/2023]
Abstract
Dendrite shape impacts functional connectivity and is mediated by organization and dynamics of cytoskeletal fibers. Identifying the molecular factors that regulate dendritic cytoskeletal architecture is therefore important in understanding the mechanistic links between cytoskeletal organization and neuronal function. We identified Formin 3 (Form3) as an essential regulator of cytoskeletal architecture in nociceptive sensory neurons in Drosophila larvae. Time course analyses reveal that Form3 is cell-autonomously required to promote dendritic arbor complexity. We show that form3 is required for the maintenance of a population of stable dendritic microtubules (MTs), and mutants exhibit defects in the localization of dendritic mitochondria, satellite Golgi, and the TRPA channel Painless. Form3 directly interacts with MTs via FH1-FH2 domains. Mutations in human inverted formin 2 (INF2; ortholog of form3) have been causally linked to Charcot-Marie-Tooth (CMT) disease. CMT sensory neuropathies lead to impaired peripheral sensitivity. Defects in form3 function in nociceptive neurons result in severe impairment of noxious heat-evoked behaviors. Expression of the INF2 FH1-FH2 domains partially recovers form3 defects in MTs and nocifensive behavior, suggesting conserved functions, thereby providing putative mechanistic insights into potential etiologies of CMT sensory neuropathies.
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Affiliation(s)
- Ravi Das
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
| | | | - Jamin M Letcher
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
| | - Jenna M Harris
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
| | - Sumit Nanda
- Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA 22030, USA
| | - Istvan Foldi
- Biological Research Centre, Hungarian Academy of Sciences, Institute of Genetics, MTA-SZBK NAP B Axon Growth and Regeneration Group, Temesvári krt. 62, Szeged H-6726, Hungary
| | - Erin N Lottes
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
| | - Hansley M Bobo
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
| | | | - József Mihály
- Biological Research Centre, Hungarian Academy of Sciences, Institute of Genetics, MTA-SZBK NAP B Axon Growth and Regeneration Group, Temesvári krt. 62, Szeged H-6726, Hungary
| | - Giorgio A Ascoli
- Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA 22030, USA
| | - Daniel N Cox
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
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4
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Kuwashima Y, Yanagawa M, Abe M, Hiroshima M, Ueda M, Arita M, Sako Y. Comparative Analysis of Single-Molecule Dynamics of TRPV1 and TRPV4 Channels in Living Cells. Int J Mol Sci 2021; 22:ijms22168473. [PMID: 34445178 PMCID: PMC8395219 DOI: 10.3390/ijms22168473] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/28/2021] [Accepted: 08/03/2021] [Indexed: 12/27/2022] Open
Abstract
TRPV1 and TRPV4, members of the transient receptor potential vanilloid family, are multimodal ion channels activated by various stimuli, including temperature and chemicals. It has been demonstrated that TRPV channels function as tetramers; however, the dynamics of the diffusion, oligomerization, and endocytosis of these channels in living cells are unclear. Here we undertook single-molecule time-lapse imaging of TRPV1 and TRPV4 in HEK 293 cells. Differences were observed between TRPV1 and TRPV4 before and after agonist stimulation. In the resting state, TRPV4 was more likely to form higher-order oligomers within immobile membrane domains than TRPV1. TRPV1 became immobile after capsaicin stimulation, followed by its gradual endocytosis. In contrast, TRPV4 was rapidly internalized upon stimulation with GSK1016790A. The selective loss of immobile higher-order oligomers from the cell surface through endocytosis increased the proportion of the fast-diffusing state for both subtypes. With the increase in the fast state, the association rate constants of TRPV1 and TRPV4 increased, regenerating the higher-order oligomers. Our results provide a possible mechanism for the different rates of endocytosis of TRPV1 and TRPV4 based on the spatial organization of the higher-order structures of the two TRPV channels.
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Affiliation(s)
- Yutaro Kuwashima
- Cellular Informatics Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan; (Y.K.); (M.A.); (M.H.)
- Division of Physiological Chemistry and Metabolism, Keio University Faculty of Pharmacy, Tokyo 105-0011, Japan;
| | - Masataka Yanagawa
- Cellular Informatics Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan; (Y.K.); (M.A.); (M.H.)
- Japan Science and Technology Agency (JST), PRESTO, 4-1-8, Honcho, Kawaguchi 332-0012, Saitama, Japan
- Correspondence: (M.Y.); (Y.S.)
| | - Mitsuhiro Abe
- Cellular Informatics Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan; (Y.K.); (M.A.); (M.H.)
| | - Michio Hiroshima
- Cellular Informatics Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan; (Y.K.); (M.A.); (M.H.)
- Laboratory for Cell Signaling Dynamics, RIKEN Center for Biosystems Dynamics Research (BDR), 6-2-3, Furuedai, Suita 565-0874, Osaka, Japan;
| | - Masahiro Ueda
- Laboratory for Cell Signaling Dynamics, RIKEN Center for Biosystems Dynamics Research (BDR), 6-2-3, Furuedai, Suita 565-0874, Osaka, Japan;
- Laboratory of Single Molecule Biology, Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita 565-0871, Osaka, Japan
| | - Makoto Arita
- Division of Physiological Chemistry and Metabolism, Keio University Faculty of Pharmacy, Tokyo 105-0011, Japan;
- Laboratory for Metabolomics, RIKEN Center for Integrative Medical Sciences (IMS), Yokohama 230-0045, Kanagawa, Japan
- Cellular and Molecular Epigenetics Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama 230-0045, Kanagawa, Japan
| | - Yasushi Sako
- Cellular Informatics Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan; (Y.K.); (M.A.); (M.H.)
- Correspondence: (M.Y.); (Y.S.)
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5
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Melkes B, Markova V, Hejnova L, Marek A, Novotny J. Naloxone Is a Potential Binding Ligand and Activator of the Capsaicin Receptor TRPV1. Biol Pharm Bull 2021; 43:908-912. [PMID: 32378567 DOI: 10.1248/bpb.b19-00806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The receptor channel transient receptor potential vanilloid 1 (TRPV1) functions as a sensor of noxious heat and various chemicals. There is increasing evidence for a crosstalk between TRPV1 and opioid receptors. Here we investigated the effect of the prototypical TRPV1 agonist capsaicin and selected opioid ligands on TRPV1 movement in the plasma membrane and intracellular calcium levels in HEK293 cells expressing TRPV1 tagged with cyan fluorescent protein (CFP). We observed that lateral mobility of TRPV1 increased after treatment of cells with capsaicin or naloxone (a nonselective opioid receptor antagonist) but not with DAMGO (a μ-opioid receptor agonist). Interestingly, both capsaicin and naloxone, unlike DAMGO, elicited intracellular calcium responses. The increased TRPV1 movement and calcium influx induced by capsaicin and naloxone were blocked by the TRPV1 antagonist capsazepine. The ability of naloxone to directly interact with TRPV1 was further corroborated by [3H]-naloxone binding. In conclusion, our data suggest that besides acting as an opioid receptor antagonist, naloxone may function as a potential TRPV1 agonist.
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Affiliation(s)
- Barbora Melkes
- Department of Physiology, Faculty of Science, Charles University
| | - Vendula Markova
- Department of Physiology, Faculty of Science, Charles University
| | - Lucie Hejnova
- Department of Physiology, Faculty of Science, Charles University
| | - Ales Marek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences
| | - Jiri Novotny
- Department of Physiology, Faculty of Science, Charles University
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6
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Mohandass A, Surenkhuu B, Covington K, Baskaran P, Lehmann T, Thyagarajan B. Kainic Acid Activates TRPV1 via a Phospholipase C/PIP2-Dependent Mechanism in Vitro. ACS Chem Neurosci 2020; 11:2999-3007. [PMID: 32833423 PMCID: PMC7747480 DOI: 10.1021/acschemneuro.0c00297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Kainic acid (KA) is an excitotoxic glutamate analogue produced by a marine seaweed. It elicits neuronal excitotoxicity leading to epilepsy in rodents. Activation of transient receptor potential vanilloid subfamily 1 (TRPV1), a nonselective cation channel protein, by capsaicin, prevents KA-induced seizures in a mouse model of temporal lobe epilepsy. However, the precise mechanism behind this protective effect of capsaicin remains unclear. In order to analyze the direct effect of KA on TRPV1, we evaluated the ability of KA to activate TRPV1 and analyzed its binding to TRPV1 using a molecular modeling approach. In vitro, KA activates a Ca2+ influx into TRPV1 expressing HEK293 cells but not in contsrol HEK293 cells. Pretreatment with either capsaicin (1 M) or capsazepine (10 M; TRPV1 antagonist) prevents the effect of KA. Pharmacological inhibition of phospholipase C (PLC) by U73122 or overexpression of phosphatidylinositol 5 phosphatase (Synaptojanin 1; Synj-1) counters the effect of KA. Further, KA treatment causes actin reorganization in HEKTRPV1 cells and PLC inhibition by U73122 prevents this. Molecular modeling data revealed that KA binds to TRPV1 and prebinding with capsaicin prevents the binding of KA to TRPV1. Consistently, the lack of effect of KA in activating chicken TRPV1, which is insensitive to capsaicin, suggests that there is a significant overlap between the sites of KA and capsaicin activation of TRPV1. However, PLC inhibition did not suppress TRPV1 activation by capsaicin. Collectively, our data suggest that KA binds to and activates TRPV1 and causes actin reorganization via PLC-dependent mechanism in vitro. We propose that KA mediates Ca2+ induced toxicity possibly by activating TRPV1. Therefore, inhibiting TRPV1 will be a beneficial strategy in abating Ca2+-induced neurotoxicity.
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7
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Deftu AF, Filippi A, Gheorghe RO, Ristoiu V. CXCL1 activates TRPV1 via Gi/o protein and actin filaments. Life Sci 2017; 193:282-291. [PMID: 28966134 DOI: 10.1016/j.lfs.2017.09.041] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 09/18/2017] [Accepted: 09/27/2017] [Indexed: 02/07/2023]
Abstract
AIMS CXCL1 is a chemokine with pleiotropic effects, including pain and itch. Itch, an unpleasant sensation that elicits the desire or reflex to scratch, it is evoked mainly from the skin and implicates activation of a specific subset of IB4+, C-type primary afferents. In previous studies we showed that acute application of CXCL1 induced a Ca2+ influx of low amplitude and slow kinetics in a subpopulation of transient receptor potential vanilloid type 1 (TRPV1)+/isolectin B4 (IB4)+dorsal root ganglia neurons which also responded to other itch-inducing agents. In this study we explored the mechanism behind the Ca2+ influx to better understand how CXCL1 acts on primary sensitive neurons to induce itch. MATERIALS AND METHODS Intracellular Ca2+ imaging and patch-clamp recordings on dorsal root ganglia neurons primary cultures and HEK293T cell transiently transfected with TRPV1 and CXCR2 plasmids were used to investigate the acute effect (12min application) of 4nM CXCL1. In primary cultures, the focus was on TRPV1+/IB4+ cells to which the itch-sensitive neurons belong. KEY FINDINGS The results showed that the Ca2+ influx induced by the acute application of CXCL1 is mediated mainly by TRPV1 receptors and depends on extracellular Ca2+ not on intracellular stores. TRPV1 was activated, not sensitized by CXCL1, in a CXCR2 receptors- and actin filaments-dependent manner, since specific blockers and actin depolymerizing agents disrupted the CXCL1 effect. SIGNIFICANCE This study brings additional data about the itch inducing mechanism of CXCL1 chemokine and about a new mechanism of TRPV1 activation via actin filaments.
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Affiliation(s)
- Alexandru Florian Deftu
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, Splaiul Independenţei 91-95, 050095 Bucharest, Romania
| | - Alexandru Filippi
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, Splaiul Independenţei 91-95, 050095 Bucharest, Romania; Department of Medical Biophysics, University of Medicine and Pharmacy "Carol Davila", Bulevardul Eroilor Sanitari 8, 050474 Bucharest, Romania
| | - Roxana Olimpia Gheorghe
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, Splaiul Independenţei 91-95, 050095 Bucharest, Romania
| | - Violeta Ristoiu
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, Splaiul Independenţei 91-95, 050095 Bucharest, Romania.
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8
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Poteser M, Leitinger G, Pritz E, Platzer D, Frischauf I, Romanin C, Groschner K. Live-cell imaging of ER-PM contact architecture by a novel TIRFM approach reveals extension of junctions in response to store-operated Ca 2+-entry. Sci Rep 2016; 6:35656. [PMID: 27759093 PMCID: PMC5069484 DOI: 10.1038/srep35656] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 09/29/2016] [Indexed: 01/16/2023] Open
Abstract
Nanometer-spaced appositions between endoplasmic reticulum and plasma membrane (ER-PM junctions) stabilized by membrane-joining protein complexes are critically involved in cellular Ca2+-handling and lipid trafficking. ER-PM junctional architecture and plasticity associated with inter-membrane communication are as yet barely understood. Here, we introduce a method to precisely characterize ER-PM junction morphology and dynamics with high temporal resolution and minimal disturbance of junctional intermembrane communication. We show that expression of soluble cytosolic fluorophores in combination with TIRFM enables to delineate ER and PM distance in the range of 10-150 nm. Live-cell imaging of sub-plasmalemmal structures in RBL-2H3 mast cells by this method, designated as fluorescence density mapping (FDM), revealed profound dynamics of ER-PM contact sites in response to store-depletion. We report the existence of a Ca2+-dependent process that expands the junctional ER to enlarge its contact surface with the PM, thereby promoting and stabilizing STIM1-Orai1 competent ER-PM junctions.
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Affiliation(s)
- Michael Poteser
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
| | - Gerd Leitinger
- Institute of Cell Biology, Histology and Embryology Research Unit "Electron Microscopic Techniques", Medical University of Graz, Harrachgasse 21/7, 8010 Graz, Austria
| | - Elisabeth Pritz
- Institute of Cell Biology, Histology and Embryology Research Unit "Electron Microscopic Techniques", Medical University of Graz, Harrachgasse 21/7, 8010 Graz, Austria
| | - Dieter Platzer
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
| | - Irene Frischauf
- Institute of Biophysics, Johannes Kepler University of Linz, Austria, Gruberstrasse 40, 4020 Linz, Austria
| | - Christoph Romanin
- Institute of Biophysics, Johannes Kepler University of Linz, Austria, Gruberstrasse 40, 4020 Linz, Austria
| | - Klaus Groschner
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/4, 8010 Graz, Austria
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9
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Serebryannyy LA, Parilla M, Annibale P, Cruz CM, Laster K, Gratton E, Kudryashov D, Kosak ST, Gottardi CJ, de Lanerolle P. Persistent nuclear actin filaments inhibit transcription by RNA polymerase II. J Cell Sci 2016; 129:3412-25. [PMID: 27505898 DOI: 10.1242/jcs.195867] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 07/27/2016] [Indexed: 12/26/2022] Open
Abstract
Actin is abundant in the nucleus and it is clear that nuclear actin has important functions. However, mystery surrounds the absence of classical actin filaments in the nucleus. To address this question, we investigated how polymerizing nuclear actin into persistent nuclear actin filaments affected transcription by RNA polymerase II. Nuclear filaments impaired nuclear actin dynamics by polymerizing and sequestering nuclear actin. Polymerizing actin into stable nuclear filaments disrupted the interaction of actin with RNA polymerase II and correlated with impaired RNA polymerase II localization, dynamics, gene recruitment, and reduced global transcription and cell proliferation. Polymerizing and crosslinking nuclear actin in vitro similarly disrupted the actin-RNA-polymerase-II interaction and inhibited transcription. These data rationalize the general absence of stable actin filaments in mammalian somatic nuclei. They also suggest a dynamic pool of nuclear actin is required for the proper localization and activity of RNA polymerase II.
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Affiliation(s)
- Leonid A Serebryannyy
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Megan Parilla
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Paolo Annibale
- Laboratory of Fluorescence Dynamics, University of California Irvine, Irvine, CA 92697, USA
| | - Christina M Cruz
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Kyle Laster
- Department of Cell and Molecular Biology, Northwestern University, Chicago, IL 60611, USA
| | - Enrico Gratton
- Laboratory of Fluorescence Dynamics, University of California Irvine, Irvine, CA 92697, USA
| | - Dmitri Kudryashov
- Department of Chemistry and Biochemistry, Ohio State University, Columbus, OH 43210, USA
| | - Steven T Kosak
- Department of Cell and Molecular Biology, Northwestern University, Chicago, IL 60611, USA
| | - Cara J Gottardi
- Department of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Primal de Lanerolle
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL 60612, USA
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10
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Abbandonato G, Storti B, Signore G, Beltram F, Bizzarri R. Quantitative optical lock-in detection for quantitative imaging of switchable and non-switchable components. Microsc Res Tech 2016; 79:929-937. [PMID: 27447845 DOI: 10.1002/jemt.22724] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 06/24/2016] [Accepted: 06/28/2016] [Indexed: 11/08/2022]
Abstract
Reversible photoswitching has been proposed as a way to identify molecules that are present in small numbers over a large, non-switching, background. This approach, called optical-lock-in-detection (OLID) requires the deterministic control of the fluorescence of a photochromic emitter through optical modulation between a bright (on) and a dark state (off). OLID yields a high-contrast map where the switching molecules are pinpointed, but the fractional intensities of the emitters are not returned. The present work presents a modified OLID approach (quantitative OLID or qOLID) that yields quantitative information of the switching (fSW ) and non-switching (fNS ) components. After the validation of the method with a sample dataset and image sequence, we apply qOLID to measurements in cells that transiently express the photochromic protein EYQ1. We show that qOLID is efficient in separating the modulated from the non-modulated signal, the latter deriving from background/autofluorescence or fluorophores emitting in the same spectral region. Finally, we apply qOLID to Förster (Fluorescence) Resonance Energy Transfer (FRET) imaging. We here demonstrate that qOLID is able to highlight the distribution of FRET intensity in a sample by using a photochromic donor and a non-photochromic acceptor.
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Affiliation(s)
- Gerardo Abbandonato
- NEST, Scuola Normale Superiore and Istituto Nanoscienze, piazza San Silvestro 12, I-56127, Italy
| | - Barbara Storti
- NEST, Scuola Normale Superiore and Istituto Nanoscienze, piazza San Silvestro 12, I-56127, Italy
| | - Giovanni Signore
- Center for Nanotechnology Innovation @ NEST, Istituto Italiano di Tecnologia, piazza San Silvestro 12, I-56127, Italy
| | - Fabio Beltram
- NEST, Scuola Normale Superiore and Istituto Nanoscienze, piazza San Silvestro 12, I-56127, Italy
| | - Ranieri Bizzarri
- NEST, Scuola Normale Superiore and Istituto Nanoscienze, piazza San Silvestro 12, I-56127, Italy.
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11
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Integrating TRPV1 Receptor Function with Capsaicin Psychophysics. Adv Pharmacol Sci 2016; 2016:1512457. [PMID: 26884754 PMCID: PMC4738735 DOI: 10.1155/2016/1512457] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 12/10/2015] [Indexed: 01/17/2023] Open
Abstract
Capsaicin is a naturally occurring vanilloid that causes a hot, pungent sensation in the human oral cavity. This trigeminal stimulus activates TRPV1 receptors and stimulates an influx of cations into sensory cells. TRPV1 receptors function as homotetramers that also respond to heat, proinflammatory substances, lipoxygenase products, resiniferatoxin, endocannabinoids, protons, and peptide toxins. Kinase-mediated phosphorylation of TRPV1 leads to increased sensitivity to both chemical and thermal stimuli. In contrast, desensitization occurs via a calcium-dependent mechanism that results in receptor dephosphorylation. Human psychophysical studies have shown that capsaicin is detected at nanomole amounts and causes desensitization in the oral cavity. Psychophysical studies further indicate that desensitization can be temporarily reversed in the oral cavity if stimulation with capsaicin is resumed at short interstimulus intervals. Pretreatment of lingual epithelium with capsaicin modulates the perception of several primary taste qualities. Also, sweet taste stimuli may decrease the intensity of capsaicin perception in the oral cavity. In addition, capsaicin perception and hedonic responses may be modified by diet. Psychophysical studies with capsaicin are consistent with recent findings that have identified TRPV1 channel modulation by phosphorylation and interactions with membrane inositol phospholipids. Future studies will further clarify the importance of capsaicin and its receptor in human health and nutrition.
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12
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Li S, Tuft BW, Xu L, Polacco MA, Clarke JC, Guymon CA, Hansen MR. Microtopographical features generated by photopolymerization recruit RhoA/ROCK through TRPV1 to direct cell and neurite growth. Biomaterials 2015; 53:95-106. [PMID: 25890710 DOI: 10.1016/j.biomaterials.2015.02.057] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 02/11/2015] [Accepted: 02/13/2015] [Indexed: 01/10/2023]
Abstract
Cell processes, including growth cones, respond to biophysical cues in their microenvironment to establish functional tissue architecture and intercellular networks. The mechanisms by which cells sense and translate biophysical cues into directed growth are unknown. We used photopolymerization to fabricate methacrylate platforms with patterned microtopographical features that precisely guide neurite growth and Schwann cell alignment. Pharmacologic inhibition of the transient receptor potential cation channel subfamily V member 1 (TRPV1) or reduced expression of TRPV1 by RNAi significantly disrupts neurite guidance by these microtopographical features. Exogenous expression of TRPV1 induces alignment of NIH3T3 fibroblasts that fail to align in the absence of TRPV1, further implicating TRPV1 channels as critical mediators of cellular responses to biophysical cues. Microtopographic features increase RhoA activity in growth cones and in TRPV1-expressing NIH3T3 cells. Further, Rho-associated kinase (ROCK) phosphorylation is elevated in growth cones and neurites on micropatterned surfaces. Inhibition of RhoA/ROCK by pharmacological compounds or reduced expression of either ROCKI or ROCKII isoforms by RNAi abolishes neurite and cell alignment, confirming that RhoA/ROCK signaling mediates neurite and cell alignment to microtopographic features. These studies demonstrate that microtopographical cues recruit TRPV1 channels and downstream signaling pathways, including RhoA and ROCK, to direct neurite and cell growth.
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Affiliation(s)
- Shufeng Li
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA; Department of Otolaryngology, EYE & ENT Hospital of Fudan University, Shanghai 200031, China
| | - Bradley W Tuft
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA
| | - Linjing Xu
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Marc A Polacco
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Joseph C Clarke
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - C Allan Guymon
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA
| | - Marlan R Hansen
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA; Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA.
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13
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Storti B, Di Rienzo C, Cardarelli F, Bizzarri R, Beltram F. Unveiling TRPV1 spatio-temporal organization in live cell membranes. PLoS One 2015; 10:e0116900. [PMID: 25764349 PMCID: PMC4357434 DOI: 10.1371/journal.pone.0116900] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 12/16/2014] [Indexed: 11/18/2022] Open
Abstract
Transient Receptor Potential Vanilloid 1 (TRPV1) is a non-selective cation channel that integrates several stimuli into nociception and neurogenic inflammation. Here we investigated the subtle TRPV1 interplay with candidate membrane partners in live cells by a combination of spatio-temporal fluctuation techniques and fluorescence resonance energy transfer (FRET) imaging. We show that TRPV1 is split into three populations with fairly different molecular properties: one binding to caveolin-1 and confined into caveolar structures, one actively guided by microtubules through selective binding, and one which diffuses freely and is not directly implicated in regulating receptor functionality. The emergence of caveolin-1 as a new interactor of TRPV1 evokes caveolar endocytosis as the main desensitization pathway of TRPV1 receptor, while microtubule binding agrees with previous data suggesting the receptor stabilization in functional form by these cytoskeletal components. Our results shed light on the hitherto unknown relationships between spatial organization and TRPV1 function in live-cell membranes.
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Affiliation(s)
- Barbara Storti
- NEST, Scuola Normale Superiore and Istituto Nanoscienze—CNR, Pisa, Italy
| | - Carmine Di Rienzo
- NEST, Scuola Normale Superiore and Istituto Nanoscienze—CNR, Pisa, Italy
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Pisa, Italy
| | - Francesco Cardarelli
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Pisa, Italy
| | - Ranieri Bizzarri
- NEST, Scuola Normale Superiore and Istituto Nanoscienze—CNR, Pisa, Italy
- * E-mail:
| | - Fabio Beltram
- NEST, Scuola Normale Superiore and Istituto Nanoscienze—CNR, Pisa, Italy
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Pisa, Italy
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14
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Marchetti L, Luin S, Bonsignore F, de Nadai T, Beltram F, Cattaneo A. Ligand-induced dynamics of neurotrophin receptors investigated by single-molecule imaging approaches. Int J Mol Sci 2015; 16:1949-79. [PMID: 25603178 PMCID: PMC4307343 DOI: 10.3390/ijms16011949] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 01/05/2015] [Indexed: 01/14/2023] Open
Abstract
Neurotrophins are secreted proteins that regulate neuronal development and survival, as well as maintenance and plasticity of the adult nervous system. The biological activity of neurotrophins stems from their binding to two membrane receptor types, the tropomyosin receptor kinase and the p75 neurotrophin receptors (NRs). The intracellular signalling cascades thereby activated have been extensively investigated. Nevertheless, a comprehensive description of the ligand-induced nanoscale details of NRs dynamics and interactions spanning from the initial lateral movements triggered at the plasma membrane to the internalization and transport processes is still missing. Recent advances in high spatio-temporal resolution imaging techniques have yielded new insight on the dynamics of NRs upon ligand binding. Here we discuss requirements, potential and practical implementation of these novel approaches for the study of neurotrophin trafficking and signalling, in the framework of current knowledge available also for other ligand-receptor systems. We shall especially highlight the correlation between the receptor dynamics activated by different neurotrophins and the respective signalling outcome, as recently revealed by single-molecule tracking of NRs in living neuronal cells.
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Affiliation(s)
- Laura Marchetti
- National Enterprise for nanoScience and nanoTechnology (NEST) Laboratory, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza San Silvestro 12, Pisa I-56127, Italy.
| | - Stefano Luin
- National Enterprise for nanoScience and nanoTechnology (NEST) Laboratory, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza San Silvestro 12, Pisa I-56127, Italy.
| | - Fulvio Bonsignore
- National Enterprise for nanoScience and nanoTechnology (NEST) Laboratory, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza San Silvestro 12, Pisa I-56127, Italy.
| | - Teresa de Nadai
- Biology Laboratory (BioSNS), Scuola Normale Superiore and Istituto di Neuroscienze-CNR, via Moruzzi 1, Pisa I-56100, Italy.
| | - Fabio Beltram
- National Enterprise for nanoScience and nanoTechnology (NEST) Laboratory, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza San Silvestro 12, Pisa I-56127, Italy.
| | - Antonino Cattaneo
- Biology Laboratory (BioSNS), Scuola Normale Superiore and Istituto di Neuroscienze-CNR, via Moruzzi 1, Pisa I-56100, Italy.
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15
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Abstract
In this issue of Neuron, Wong et al. (2014) report a remarkable evolutionarily conserved role for the Drosophila TRPV1 homolog Inactive controlling synaptic growth at larval neuromuscular junctions by facilitating Ca(2+) release from the endoplasmic reticulum.
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Affiliation(s)
- Elliot Imler
- Department of Neuroscience, University of Arizona, Tucson, AZ 85721, USA; Graduate Interdisciplinary Program in Neuroscience, University of Arizona, Tucson, AZ 85721, USA
| | - Konrad E Zinsmaier
- Department of Neuroscience, University of Arizona, Tucson, AZ 85721, USA; Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ 85721, USA.
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16
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Kun J, Szitter I, Kemény Á, Perkecz A, Kereskai L, Pohóczky K, Vincze Á, Gódi S, Szabó I, Szolcsányi J, Pintér E, Helyes Z. Upregulation of the transient receptor potential ankyrin 1 ion channel in the inflamed human and mouse colon and its protective roles. PLoS One 2014; 9:e108164. [PMID: 25265225 PMCID: PMC4180273 DOI: 10.1371/journal.pone.0108164] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 08/18/2014] [Indexed: 12/18/2022] Open
Abstract
Transient Receptor Potential Ankyrin 1 (TRPA1) channels are localized on sensory nerves and several non-neural cells, but data on their functional significance are contradictory. We analysed the presence and alterations of TRPA1 in comparison with TRP Vanilloid 1 (TRPV1) at mRNA and protein levels in human and mouse intact and inflamed colons. The role of TRPA1 in a colitis model was investigated using gene-deficient mice. TRPA1 and TRPV1 expressions were investigated in human colon biopsies of healthy subjects and patients with inflammatory bowel diseases (IBD: ulcerative colitis, Crohn's disease) with quantitative PCR and immunohistochemistry. Mouse colitis was induced by oral 2% dextran-sulphate (DSS) for 10 days. For investigating the functions of TRPA1, Disease Activity Index (weight loss, stool consistency, blood content) was determined in C57BL/6-based Trpa1-deficient (knockout: KO) and wildtype (WT) mice. Sensory neuropeptides, their receptors, and inflammatory cytokines/chemokines were determined with qPCR or Luminex. In human and mouse colons TRPA1 and TRPV1 are located on epithelial cells, macrophages, enteric ganglia. Significant upregulation of TRPA1 mRNA was detected in inflamed samples. In Trpa1 KO mice, Disease Activity Index was significantly higher compared to WTs. It could be explained by the greater levels of substance P, neurokinins A and B, neurokinin 1 receptor, pituitary adenylate-cyclase activating polypeptide, vasoactive intestinal polypeptide, and also interleukin-1beta, macrophage chemoattractant protein-1, monokine induced by gamma interferon-1, tumor necrosis factor-alpha and B-lymphocyte chemoattractant in the distal colon. TRPA1 is upregulated in colitis and its activation exerts protective roles by decreasing the expressions of several proinflammatory neuropeptides, cytokines and chemokines.
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Affiliation(s)
- József Kun
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- Molecular Pharmacology Research Group, János Szentágothai Research Center, University of Pécs, Pécs, Hungary
| | - István Szitter
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- Molecular Pharmacology Research Group, János Szentágothai Research Center, University of Pécs, Pécs, Hungary
| | - Ágnes Kemény
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- Molecular Pharmacology Research Group, János Szentágothai Research Center, University of Pécs, Pécs, Hungary
| | - Anikó Perkecz
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
| | - László Kereskai
- Department of Pathology, Medical School, University of Pécs, Pécs, Hungary
| | - Krisztina Pohóczky
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
| | - Áron Vincze
- 1st Department of Internal Medicine, University of Pécs, Pécs, Hungary
| | - Szilárd Gódi
- 1st Department of Internal Medicine, University of Pécs, Pécs, Hungary
| | - Imre Szabó
- 1st Department of Internal Medicine, University of Pécs, Pécs, Hungary
| | - János Szolcsányi
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
| | - Erika Pintér
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- Molecular Pharmacology Research Group, János Szentágothai Research Center, University of Pécs, Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- Molecular Pharmacology Research Group, János Szentágothai Research Center, University of Pécs, Pécs, Hungary
- * E-mail:
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17
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Ferrandiz-Huertas C, Mathivanan S, Wolf CJ, Devesa I, Ferrer-Montiel A. Trafficking of ThermoTRP Channels. MEMBRANES 2014; 4:525-64. [PMID: 25257900 PMCID: PMC4194048 DOI: 10.3390/membranes4030525] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 07/11/2014] [Accepted: 08/08/2014] [Indexed: 12/19/2022]
Abstract
ThermoTRP channels (thermoTRPs) define a subfamily of the transient receptor potential (TRP) channels that are activated by changes in the environmental temperature, from noxious cold to injurious heat. Acting as integrators of several stimuli and signalling pathways, dysfunction of these channels contributes to several pathological states. The surface expression of thermoTRPs is controlled by both, the constitutive and regulated vesicular trafficking. Modulation of receptor surface density during pathological processes is nowadays considered as an interesting therapeutic approach for management of diseases, such as chronic pain, in which an increased trafficking is associated with the pathological state. This review will focus on the recent advances trafficking of the thermoTRP channels, TRPV1, TRPV2, TRPV4, TRPM3, TRPM8 and TRPA1, into/from the plasma membrane. Particularly, regulated membrane insertion of thermoTRPs channels contributes to a fine tuning of final channel activity, and indeed, it has resulted in the development of novel therapeutic approaches with successful clinical results such as disruption of SNARE-dependent exocytosis by botulinum toxin or botulinomimetic peptides.
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Affiliation(s)
| | - Sakthikumar Mathivanan
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Alicante 03202, Spain.
| | - Christoph Jakob Wolf
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Alicante 03202, Spain.
| | - Isabel Devesa
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Alicante 03202, Spain.
| | - Antonio Ferrer-Montiel
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Alicante 03202, Spain.
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18
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Prager-Khoutorsky M, Khoutorsky A, Bourque CW. Unique interweaved microtubule scaffold mediates osmosensory transduction via physical interaction with TRPV1. Neuron 2014; 83:866-78. [PMID: 25123313 DOI: 10.1016/j.neuron.2014.07.023] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2014] [Indexed: 01/19/2023]
Abstract
The electrical activity of mammalian osmosensory neurons (ONs) is increased by plasma hypertonicity to command thirst, antidiuretic hormone release, and increased sympathetic tone during dehydration. Osmosensory transduction is a mechanical process whereby decreases in cell volume cause the activation of transient receptor potential vanilloid type-1 (TRPV1) channels to induce depolarization and increase spiking activity in ONs. However, it is not known how cell shrinking is mechanically coupled to channel activation. Using superresolution imaging, we found that ONs are endowed with a uniquely interweaved scaffold of microtubules throughout their somata. Microtubules physically interact with the C terminus of TRPV1 at the cell surface and provide a pushing force that drives channels activation during shrinking. Moreover, we found that changes in the density of these interactions can bidirectionally modulate osmosensory gain. Microtubules are thus an essential component of the vital neuronal mechanotransduction apparatus that allows the brain to monitor and correct body hydration.
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Affiliation(s)
- Masha Prager-Khoutorsky
- Center for Research in Neuroscience, Research Institute of the McGill University Health Centre, Montreal General Hospital, Montreal, QC H3G 1A4, Canada
| | - Arkady Khoutorsky
- Department of Biochemistry and Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada
| | - Charles W Bourque
- Center for Research in Neuroscience, Research Institute of the McGill University Health Centre, Montreal General Hospital, Montreal, QC H3G 1A4, Canada.
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19
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Zhang H, Li H, Yang L, Deng Z, Luo H, Ye D, Bai Z, Zhu L, Ye W, Wang L, Chen L. The ClC-3 chloride channel associated with microtubules is a target of paclitaxel in its induced-apoptosis. Sci Rep 2014; 3:2615. [PMID: 24026363 PMCID: PMC3770968 DOI: 10.1038/srep02615] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Accepted: 08/20/2013] [Indexed: 02/06/2023] Open
Abstract
Recent evidences show that cationic fluxes play a pivotal role in cell apoptosis. In this study, the roles of Cl− channels in paclitaxel-induced apoptosis were investigated in nasopharyngeal carcinoma CNE-2Z cells. Chloride current and apoptosis were induced by paclitaxel and inhibited by chloride channel blockers. Paclitaxel-activated current possessed similar properties to volume-activated chloride current. After ClC-3 was knocked-down by ClC-3-siRNA, hypotonicity-activated and paclitaxel-induced chloride currents were obviously decreased, indicating that the chloride channel involved in paclitaxel-induced apoptosis may be ClC-3. In early apoptotic cells, ClC-3 was up-regulated significantly; over-expressed ClC-3 was accumulated in cell membrane to form intercrossed filaments, which were co-localized with α-tubulins; changes of ultrastructures and decrease of flexibility in cell membrane were detected by atomic force microscopy. These suggest that ClC-3 is a critical target of paclitaxel and the involvement of ClC-3 in apoptosis may be associated with its accumulation with membrane microtubules and its over activation.
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Affiliation(s)
- Haifeng Zhang
- 1] Department of Physiology, Medical College, Jinan University, Guangzhou 510632, China [2] Department of Pathology, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, China [3]
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20
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Flynn R, Chapman K, Iftinca M, Aboushousha R, Varela D, Altier C. Targeting the transient receptor potential vanilloid type 1 (TRPV1) assembly domain attenuates inflammation-induced hypersensitivity. J Biol Chem 2014; 289:16675-87. [PMID: 24808184 DOI: 10.1074/jbc.m114.558668] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The transient receptor potential channel vanilloid type 1 (TRPV1) is a non-selective cation channel expressed in sensory neurons of the dorsal root and trigeminal ganglia. TRPV1 is a polymodal channel activated by noxious heat, capsaicin, and protons. As a sensor for noxious stimuli, TRPV1 channel has been described as a key contributor to pain signaling. To form a functional channel, TRPV1 subunits must assemble into tetramers, and several studies have identified the TRPV1 C terminus as an essential element in subunit association. Here we combined biochemical assays with electrophysiology and imaging-based bimolecular fluorescence complementation (BiFC) and bioluminescence resonance energy transfer (BRET) in live cells to identify a short motif in the C-terminal tail of the TRPV1 subunit that governs channel assembly. Removing this region through early truncation or targeted deletion results in loss of subunit association and channel function. Importantly, we found that interfering with TRPV1 subunit association using a plasma membrane-tethered peptide attenuated mechanical and thermal hypersensitivity in two mouse models of inflammatory hyperalgesia. This represents a novel mechanism to disrupt TRPV1 subunit assembly and hence may offer a new analgesic tool for pain relief.
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Affiliation(s)
- Robyn Flynn
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Kevin Chapman
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Mircea Iftinca
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Reem Aboushousha
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Diego Varela
- Centro de Estudios Moleculares de la Celula and Instituto de Ciencias Biomedicas, Facultad de Medicina, Universidad de Chile, Santiago, 8380453, Chile
| | - Christophe Altier
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
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21
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Recent applications of fluorescence correlation spectroscopy in live systems. FEBS Lett 2014; 588:3571-84. [PMID: 24726724 DOI: 10.1016/j.febslet.2014.03.056] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2014] [Revised: 03/29/2014] [Accepted: 03/31/2014] [Indexed: 11/20/2022]
Abstract
Fluorescence correlation spectroscopy (FCS) is a widely used technique in biophysics and has helped address many questions in the life sciences. It provides important advantages compared to other fluorescence and biophysical methods. Its single molecule sensitivity allows measuring proteins within biological samples at physiological concentrations without the need of overexpression. It provides quantitative data on concentrations, diffusion coefficients, molecular transport and interactions even in live organisms. And its reliance on simple fluorescence intensity and its fluctuations makes it widely applicable. In this review we focus on applications of FCS in live samples, with an emphasis on work in the last 5 years, in the hope to provide an overview of the present capabilities of FCS to address biologically relevant questions.
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22
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Fischer MJM, Balasuriya D, Jeggle P, Goetze TA, McNaughton PA, Reeh PW, Edwardson JM. Direct evidence for functional TRPV1/TRPA1 heteromers. Pflugers Arch 2014; 466:2229-41. [PMID: 24643480 DOI: 10.1007/s00424-014-1497-z] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 02/28/2014] [Accepted: 03/05/2014] [Indexed: 01/22/2023]
Abstract
Transient receptor potential cation channel, subfamily V, member 1 (TRPV1) plays a key role in sensing environmental hazards and in enhanced pain sensation following inflammation. A considerable proportion of TRPV1-expressing cells also express transient receptor potential cation channel, subfamily A, member 1 (TRPA1). There is evidence for a TRPV1-TRPA1 interaction that is predominantly calcium-dependent, and it has been suggested that the two proteins might form a heteromeric channel. Here, we constructed subunit concatemers to search for direct evidence for such an interaction. We found that a TRPV1::TRPV1 concatemer and TRPV1 formed channels with similar properties. A TRPV1::TRPA1 concatemer was responsive to TRPV1 agonists capsaicin, acidic pH and ethanol, but not to TRPA1 agonists. Isolated TRPV1 and TRPV1::TRPA1 imaged by atomic force microscopy (AFM) both had molecular volumes consistent with the formation of tetrameric channels. Antibodies decorated epitope tags on TRPV1 with a four-fold symmetry, as expected for a homotetramer. In contrast, pairs of antibodies decorated tags on TRPV1::TRPA1 predominantly at 180°, indicating the formation of a channel consisting of two TRPV1::TRPA1 concatemers arranged face to face. TRPV1::TRPA1 was sensitized by PKC activation and could be inhibited by a TRPV1 antagonist. TRPV1::TRPA1 was activated by heat and displayed a threshold and temperature coefficient similar to TRPV1. However, the channel formed by TRPV1::TRPA1 has only two binding sites for capsaicin and shows less total current and a smaller capsaicin-induced shift in voltage-dependent gating than TRPV1::TRPV1 or TRPV1. We conclude that the presence of TRPA1 exerts a functional inhibition on TRPV1.
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Affiliation(s)
- Michael J M Fischer
- Institute of Physiology and Pathophysiology, University of Erlangen-Nuremberg, Universitätsstrasse 17, 91052, Erlangen, Germany,
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23
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Nagy I, Friston D, Valente JS, Torres Perez JV, Andreou AP. Pharmacology of the capsaicin receptor, transient receptor potential vanilloid type-1 ion channel. PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 2014; 68:39-76. [PMID: 24941664 DOI: 10.1007/978-3-0348-0828-6_2] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The capsaicin receptor, transient receptor potential vanilloid type 1 ion channel (TRPV1), has been identified as a polymodal transducer molecule on a sub-set of primary sensory neurons which responds to various stimuli including noxious heat (> -42 degrees C), protons and vanilloids such as capsaicin, the hot ingredient of chilli peppers. Subsequently, TRPV1 has been found indispensable for the development of burning pain and reflex hyperactivity associated with inflammation of peripheral tissues and viscera, respectively. Therefore, TRPV1 is regarded as a major target for the development of novel agents for the control of pain and visceral hyperreflexia in inflammatory conditions. Initial efforts to introduce agents acting on TRPV1 into clinics have been hampered by unexpected side-effects due to wider than expected expression in various tissues, as well as by the complex pharmacology, of TRPV1. However, it is believed that better understanding of the pharmacological properties of TRPV1 and specific targeting of tissues may eventually lead to the development of clinically useful agents. In order to assist better understanding of TRPV1 pharmacology, here we are giving a comprehensive account on the activation and inactivation mechanisms and the structure-function relationship of TRPV1.
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24
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Steele DF, Fedida D. Cytoskeletal roles in cardiac ion channel expression. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1838:665-73. [PMID: 23680626 DOI: 10.1016/j.bbamem.2013.05.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 05/01/2013] [Accepted: 05/06/2013] [Indexed: 11/25/2022]
Abstract
The cytoskeleton and cardiac ion channel expression are closely linked. From the time that newly synthesized channels exit the endoplasmic reticulum, they are either traveling along the microtubule or actin cytoskeletons or likely anchored in the plasma membrane or in internal vesicular pools by those scaffolds. Molecular motors, small GTPases and even the dynamics of the cytoskeletons themselves influence the trafficking and expression of the channels. In some cases, the functioning of the channels themselves has profound influences on the cytoskeleton. Here we provide an overview of the current state of knowledge on the involvement of the actin and microtubule cytoskeletons in the trafficking, targeting and expression of cardiac ion channels and a few channels expressed elsewhere. We highlight, also, some of the many questions that remain about these processes. This article is part of a Special Issue entitled: Reciprocal influences between cell cytoskeleton and membrane channels, receptors and transporters. Guest Editor: Jean Claude Hervé.
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Affiliation(s)
- David F Steele
- Dept. of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
| | - David Fedida
- Dept. of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
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Szolcsányi J, Pintér E. Transient receptor potential vanilloid 1 as a therapeutic target in analgesia. Expert Opin Ther Targets 2013; 17:641-57. [PMID: 23421411 DOI: 10.1517/14728222.2013.772580] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION The selective excitatory action of capsaicin followed by long-term chemoanalgesia due to an action on the 'capsaicin receptor' of C-polymodal nociceptors, cloned 15 years ago, opened up fascinating perspectives for a class of nociceptor blocking analgesics. AREAS COVERED The TRPV1/capsaicin receptor is an integrative, chemoceptive, noxious heat-gated cation channel also gated by several endogenous ligands and sensitized by phosphorylation through intracellular cascades triggered from receptors of bradykinin, prostanoids, NGF and interactions with TRPA1. In this review, types of sensory receptors and unique mechanisms for blocking nociceptor action, e.g., 'pore dilation' intracellular acidosis and the long-term function-related mitochondrial swelling at the nerve terminals and sensory neurons are summarized. In humans the 8% capsaicin dermal patch is already in usage for nondiabetic neuropathic pain and two topical preparations of civamide have also been approved recently for cluster headache and osteoarthritis. Evidence for epidermal nerve terminal loss in humans after topical applications and misleading results on sensory neuron death evoked by TRPV1 agonism in animals are discussed. EXPERT OPINION The unique 'multisteric' gating of TRPV1 channel which is opened and modulated in various conformational changes to natural stimuli differs from the operation of canonical ligand-gated channels and makes it suitable to initiate development of second generation of TRPV1 antagonists without on-target side effects of hyperthermia and risk of burn injury.
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Affiliation(s)
- János Szolcsányi
- University of Pécs Medical School, Department of Pharmacology and Pharmacotherapy , H-7624 Pécs, Szigeti u. 12 , Hungary.
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Di Rienzo C, Jacchetti E, Cardarelli F, Bizzarri R, Beltram F, Cecchini M. Unveiling LOX-1 receptor interplay with nanotopography: mechanotransduction and atherosclerosis onset. Sci Rep 2013; 3:1141. [PMID: 23355954 PMCID: PMC3555090 DOI: 10.1038/srep01141] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 12/17/2012] [Indexed: 12/11/2022] Open
Abstract
Lectin-like ox-LDL receptors (LOX-1) play a crucial role in the ox-LDL–induced pathological transformation of vessel-wall components, a crucial early step in atherogenesis. LOX-1 dynamics is quantitatively investigated in human endothelial cells (HUVECs) exposed to environmental nanotopographies. We demonstrate distinct nanotopography-induced cell phenotypes, characterized by different morphology, LOX-1 diffusivity and oligomerization state: HUVECs on flat surfaces exhibit the behavior found in pro-atherogenic conditions, while growth on nanogratings can interfere with LOX-1 dynamics and lead to a behavior characteristic of normal, non-pathological conditions.
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Affiliation(s)
- Carmine Di Rienzo
- NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12 , 56127 Pisa, Italy
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Ludueña RF. A Hypothesis on the Origin and Evolution of Tubulin. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2013; 302:41-185. [DOI: 10.1016/b978-0-12-407699-0.00002-9] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Goswami C. TRPV1-tubulin complex: involvement of membrane tubulin in the regulation of chemotherapy-induced peripheral neuropathy. J Neurochem 2012; 123:1-13. [PMID: 22845740 DOI: 10.1111/j.1471-4159.2012.07892.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 07/16/2012] [Accepted: 07/19/2012] [Indexed: 12/18/2022]
Abstract
Existence of microtubule cytoskeleton at the membrane and submembranous regions, referred as 'membrane tubulin' has remained controversial for a long time. Since we reported physical and functional interaction of Transient Receptor Potential Vanilloid Sub Type 1 (TRPV1) with microtubules and linked the importance of TRPV1-tubulin complex in the context of chemotherapy-induced peripheral neuropathy, a few more reports have characterized this interaction in in vitro and in in vivo condition. However, the cross-talk between TRPs with microtubule cytoskeleton, and the complex feedback regulations are not well understood. Sequence analysis suggests that other than TRPV1, few TRPs can potentially interact with microtubules. The microtubule interaction with TRPs has evolutionary origin and has a functional significance. Biochemical evidence, Fluorescence Resonance Energy Transfer analysis along with correlation spectroscopy and fluorescence anisotropy measurements have confirmed that TRPV1 interacts with microtubules in live cell and this interaction has regulatory roles. Apart from the transport of TRPs and maintaining the cellular structure, microtubules regulate signaling and functionality of TRPs at the single channel level. Thus, TRPV1-tubulin interaction sets a stage where concept and parameters of 'membrane tubulin' can be tested in more details. In this review, I critically analyze the advancements made in biochemical, pharmacological, behavioral as well as cell-biological observations and summarize the limitations that need to be overcome in the future.
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Affiliation(s)
- Chandan Goswami
- National Institute of Science Education and Research, Bhubaneswar, Orissa, India.
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Rocchetti A, Sharma T, Wulfetange C, Scholz-Starke J, Grippa A, Carpaneto A, Dreyer I, Vitale A, Czempinski K, Pedrazzini E. The putative K(+) channel subunit AtKCO3 forms stable dimers in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2012; 3:251. [PMID: 23162563 PMCID: PMC3495302 DOI: 10.3389/fpls.2012.00251] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Accepted: 10/22/2012] [Indexed: 05/20/2023]
Abstract
The permeation pore of K(+) channels is formed by four copies of the pore domain. AtKCO3 is the only putative voltage-independent K(+) channel subunit of Arabidopsis thaliana with a single pore domain. KCO3-like proteins recently emerged in evolution and, to date, have been found only in the genus Arabidopsis (A. thaliana and A. lyrata). We show that the absence of KCO3 does not cause marked changes in growth under various conditions. Only under osmotic stress we observed reduced root growth of the kco3-1 null-allele line. This phenotype was complemented by expressing a KCO3 mutant with an inactive pore, indicating that the function of KCO3 under osmotic stress does not depend on its direct ability to transport ions. Constitutively overexpressed AtKCO3 or AtKCO3::GFP are efficiently sorted to the tonoplast indicating that the protein is approved by the endoplasmic reticulum quality control. However, vacuoles isolated from transgenic plants do not have significant alterations in current density. Consistently, both AtKCO3 and AtKCO3::GFP are detected as homodimers upon velocity gradient centrifugation, an assembly state that would not allow for activity. We conclude that if AtKCO3 ever functions as a K(+) channel, active tetramers are held by particularly weak interactions, are formed only in unknown specific conditions and may require partner proteins.
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Affiliation(s)
- Alessandra Rocchetti
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle RicercheMilano, Italy
- Alessandra Rocchetti and Tripti Sharma have contributed equally to the work
| | - Tripti Sharma
- Institute of Biochemistry and Biology, University of PotsdamPotsdam-Golm, Germany
- Alessandra Rocchetti and Tripti Sharma have contributed equally to the work
| | - Camilla Wulfetange
- Institute of Biochemistry and Biology, University of PotsdamPotsdam-Golm, Germany
| | | | - Alexandra Grippa
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle RicercheMilano, Italy
| | - Armando Carpaneto
- Istituto di Biofisica, Consiglio Nazionale delle RicercheGenova, Italy
| | - Ingo Dreyer
- Institute of Biochemistry and Biology, University of PotsdamPotsdam-Golm, Germany
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de MadridMadrid, Spain
| | - Alessandro Vitale
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle RicercheMilano, Italy
| | - Katrin Czempinski
- Institute of Biochemistry and Biology, University of PotsdamPotsdam-Golm, Germany
| | - Emanuela Pedrazzini
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle RicercheMilano, Italy
- *Correspondence: Emanuela Pedrazzini, Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche, via Bassini 15, 20133 Milano, Italy. e-mail:
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