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Lu Z, Barberio C, Fernandez‐Villegas A, Withers A, Wheeler A, Kallitsis K, Martinelli E, Savva A, Hess BM, Pappa A, Schierle GSK, Owens RM. Microelectrode Arrays Measure Blocking of Voltage-Gated Calcium Ion Channels on Supported Lipid Bilayers Derived from Primary Neurons. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2304301. [PMID: 38039435 PMCID: PMC11251556 DOI: 10.1002/advs.202304301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 10/05/2023] [Indexed: 12/03/2023]
Abstract
Drug studies targeting neuronal ion channels are crucial to understand neuronal function and develop therapies for neurological diseases. The traditional method to study neuronal ion-channel activities heavily relies on the whole-cell patch clamp as the industry standard. However, this technique is both technically challenging and labour-intensive, while involving the complexity of keeping cells alive with low throughput. Therefore, the shortcomings are limiting the efficiency of ion-channel-related neuroscience research and drug testing. Here, this work reports a new system of integrating neuron membranes with organic microelectrode arrays (OMEAs) for ion-channel-related drug studies. This work demonstrates that the supported lipid bilayers (SLBs) derived from both neuron-like (neuroblastoma) cells and primary neurons are integrated with OMEAs for the first time. The increased expression of voltage-gated calcium (CaV) ion channels on differentiated SH-SY5Y SLBs compared to non-differentiated ones is sensed electrically. Also, dose-response of the CaV ion-channel blocking effect on primary cortical neuronal SLBs from rats is monitored. The dose range causing ion channel blocking is comparable to literature. This system overcomes the major challenges from traditional methods (e.g., patch clamp) and showcases an easy-to-test, rapid, ultra-sensitive, cell-free, and high-throughput platform to monitor dose-dependent ion-channel blocking effects on native neuronal membranes.
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Affiliation(s)
- Zixuan Lu
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Chiara Barberio
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Ana Fernandez‐Villegas
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Aimee Withers
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Alexandra Wheeler
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Konstantinos Kallitsis
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Eleonora Martinelli
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Achilleas Savva
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
| | - Becky M. Hess
- Pacific Northwest National Laboratory902 Battelle BoulevardRichlandWA99 354USA
| | - Anna‐Maria Pappa
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
- Department of Biomedical EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788UAE
- Healthcare Engineering Innovation Center (HEIC)Khalifa University of Science and TechnologyAbu Dhabi127 788UAE
| | | | - Róisín M. Owens
- Department of Chemical Engineering and BiotechnologyUniversity of CambridgePhilippa Fawcett DriveCambridgeCB3 0ASUK
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Wang D, Herzig V, Dekan Z, Rosengren KJ, Payne CD, Hasan MM, Zhuang J, Bourinet E, Ragnarsson L, Alewood PF, Lewis RJ. Novel Scorpion Toxin ω-Buthitoxin-Hf1a Selectively Inhibits Calcium Influx via Ca V3.3 and Ca V3.2 and Alleviates Allodynia in a Mouse Model of Acute Postsurgical Pain. Int J Mol Sci 2024; 25:4745. [PMID: 38731963 PMCID: PMC11084959 DOI: 10.3390/ijms25094745] [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: 03/19/2024] [Revised: 04/23/2024] [Accepted: 04/24/2024] [Indexed: 05/13/2024] Open
Abstract
Venom peptides have evolved to target a wide range of membrane proteins through diverse mechanisms of action and structures, providing promising therapeutic leads for diseases, including pain, epilepsy, and cancer, as well as unique probes of ion channel structure-function. In this work, a high-throughput FLIPR window current screening assay on T-type CaV3.2 guided the isolation of a novel peptide named ω-Buthitoxin-Hf1a from scorpion Hottentotta franzwerneri crude venom. At only 10 amino acid residues with one disulfide bond, it is not only the smallest venom peptide known to target T-type CaVs but also the smallest structured scorpion venom peptide yet discovered. Synthetic Hf1a peptides were prepared with C-terminal amidation (Hf1a-NH2) or a free C-terminus (Hf1a-OH). Electrophysiological characterization revealed Hf1a-NH2 to be a concentration-dependent partial inhibitor of CaV3.2 (IC50 = 1.18 μM) and CaV3.3 (IC50 = 0.49 μM) depolarized currents but was ineffective at CaV3.1. Hf1a-OH did not show activity against any of the three T-type subtypes. Additionally, neither form showed activity against N-type CaV2.2 or L-type calcium channels. The three-dimensional structure of Hf1a-NH2 was determined using NMR spectroscopy and used in docking studies to predict its binding site at CaV3.2 and CaV3.3. As both CaV3.2 and CaV3.3 have been implicated in peripheral pain signaling, the analgesic potential of Hf1a-NH2 was explored in vivo in a mouse model of incision-induced acute post-surgical pain. Consistent with this role, Hf1a-NH2 produced antiallodynia in both mechanical and thermal pain.
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Affiliation(s)
- Dan Wang
- Department of Chinese Medicine and Pharmacy, School of Pharmacy, Jiangsu University, Zhenjiang 212013, China;
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia (L.R.); (P.F.A.)
| | - Volker Herzig
- Centre for Bioinnovation, University of the Sunshine Coast, Sippy Downs, QLD 4556, Australia;
- School of Science, Technology and Engineering, University of the Sunshine Coast, Sippy Downs, QLD 4556, Australia
| | - Zoltan Dekan
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia (L.R.); (P.F.A.)
| | - K. Johan Rosengren
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD 4072, Australia; (K.J.R.); (C.D.P.)
| | - Colton D. Payne
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD 4072, Australia; (K.J.R.); (C.D.P.)
| | - Md. Mahadhi Hasan
- Pharmacy Discipline, Life Science School, Khulna University, Khulna 9208, Bangladesh;
| | - Jiajie Zhuang
- Department of Chinese Medicine and Pharmacy, School of Pharmacy, Jiangsu University, Zhenjiang 212013, China;
| | - Emmanuel Bourinet
- Institute of Functional Genomics, Montpellier University, CNRS, INSERM, 34090 Montpellier, France;
| | - Lotten Ragnarsson
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia (L.R.); (P.F.A.)
| | - Paul F. Alewood
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia (L.R.); (P.F.A.)
| | - Richard J. Lewis
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia (L.R.); (P.F.A.)
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Filippini L, Ortner NJ, Kaserer T, Striessnig J. Ca v 1.3-selective inhibitors of voltage-gated L-type Ca 2+ channels: Fact or (still) fiction? Br J Pharmacol 2023; 180:1289-1303. [PMID: 36788128 PMCID: PMC10953394 DOI: 10.1111/bph.16060] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/17/2022] [Accepted: 01/29/2023] [Indexed: 02/16/2023] Open
Abstract
Voltage-gated L-type Ca2+ -channels (LTCCs) are the target of Ca2+ -channel blockers (CCBs), which are in clinical use for the evidence-based treatment of hypertension and angina. Their cardiovascular effects are largely mediated by the Cav 1.2-subtype. However, based on our current understanding of their physiological and pathophysiological roles, Cav 1.3 LTCCs also appear as attractive drug targets for the therapy of various diseases, including treatment-resistant hypertension, spasticity after spinal cord injury and neuroprotection in Parkinson's disease. Since CCBs inhibit both Cav 1.2 and Cav 1.3, Cav 1.3-selective inhibitors would be valuable tools to validate the therapeutic potential of Cav 1.3 channel inhibition in preclinical models. Despite a number of publications reporting the discovery of Cav 1.3-selective blockers, their selectivity remains controversial. We conclude that at present no pharmacological tools exist that are suitable to confirm or refute a role of Cav 1.3 channels in cellular responses. We also suggest essential criteria for a small molecule to be considered Cav 1.3-selective.
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Affiliation(s)
- Ludovica Filippini
- Department of Pharmacology and Toxicology and Center of Molecular BiosciencesUniversity of InnsbruckInnsbruckAustria
- Department of Pharmaceutical Chemistry, Institute of PharmacyUniversity of InnsbruckInnsbruckAustria
| | - Nadine J. Ortner
- Department of Pharmacology and Toxicology and Center of Molecular BiosciencesUniversity of InnsbruckInnsbruckAustria
| | - Teresa Kaserer
- Department of Pharmaceutical Chemistry, Institute of PharmacyUniversity of InnsbruckInnsbruckAustria
| | - Jörg Striessnig
- Department of Pharmacology and Toxicology and Center of Molecular BiosciencesUniversity of InnsbruckInnsbruckAustria
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A bivalent remipede toxin promotes calcium release via ryanodine receptor activation. Nat Commun 2023; 14:1036. [PMID: 36823422 PMCID: PMC9950431 DOI: 10.1038/s41467-023-36579-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 02/07/2023] [Indexed: 02/25/2023] Open
Abstract
Multivalent ligands of ion channels have proven to be both very rare and highly valuable in yielding unique insights into channel structure and pharmacology. Here, we describe a bivalent peptide from the venom of Xibalbanus tulumensis, a troglobitic arthropod from the enigmatic class Remipedia, that causes persistent calcium release by activation of ion channels involved in muscle contraction. The high-resolution solution structure of φ-Xibalbin3-Xt3a reveals a tandem repeat arrangement of inhibitor-cysteine knot (ICK) domains previously only found in spider venoms. The individual repeats of Xt3a share sequence similarity with a family of scorpion toxins that target ryanodine receptors (RyR). Single-channel electrophysiology and quantification of released Ca2+ stores within skinned muscle fibers confirm Xt3a as a bivalent RyR modulator. Our results reveal convergent evolution of RyR targeting toxins in remipede and scorpion venoms, while the tandem-ICK repeat architecture is an evolutionary innovation that is convergent with toxins from spider venoms.
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Ciocca M, Marcozzi S, Mariani P, Lacconi V, Di Carlo A, Cinà L, Rosato-Siri MD, Zanon A, Cattelan G, Avancini E, Lugli P, Priya S, Camaioni A, Brown TM. A Polymer Bio–Photoelectrolytic Platform for Electrical Signal Measurement and for Light Modulation of Ion Fluxes and Proliferation in a Neuroblastoma Cell Line. ADVANCED NANOBIOMED RESEARCH 2023. [DOI: 10.1002/anbr.202200127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Affiliation(s)
- Manuela Ciocca
- Department of Electronic Engineering University of Rome Tor Vergata Via del Politecnico 1 00133 Rome Italy
- Faculty of Science and Technology Free University of Bozen-Bolzano Piazza Università 1 39100 Bolzano Italy
| | - Serena Marcozzi
- Department of Biomedicine and Prevention University of Rome Tor Vergata Via Montpellier 1 00133 Rome Italy
| | - Paolo Mariani
- Department of Electronic Engineering University of Rome Tor Vergata Via del Politecnico 1 00133 Rome Italy
| | - Valentina Lacconi
- Department of Biomedicine and Prevention University of Rome Tor Vergata Via Montpellier 1 00133 Rome Italy
| | - Aldo Di Carlo
- Istituto di Struttura della Materia CNR-ISM via Fosso del Cavaliere 100 00133 Rome Italy
| | - Lucio Cinà
- Cicci Research srl., Via Giordania 227 58100 Grosseto Italy
| | - Marcelo D. Rosato-Siri
- Institute for Biomedicine, Eurac Research Affiliated Institute of the University of Lübeck 39100 Bolzano Italy
| | - Alessandra Zanon
- Institute for Biomedicine, Eurac Research Affiliated Institute of the University of Lübeck 39100 Bolzano Italy
| | - Giada Cattelan
- Institute for Biomedicine, Eurac Research Affiliated Institute of the University of Lübeck 39100 Bolzano Italy
| | - Enrico Avancini
- Faculty of Science and Technology Free University of Bozen-Bolzano Piazza Università 1 39100 Bolzano Italy
| | - Paolo Lugli
- Faculty of Science and Technology Free University of Bozen-Bolzano Piazza Università 1 39100 Bolzano Italy
| | - Shashank Priya
- Department of Materials Science and Engineering Pennsylvania State University University Park PA 16802 USA
| | - Antonella Camaioni
- Department of Biomedicine and Prevention University of Rome Tor Vergata Via Montpellier 1 00133 Rome Italy
| | - Thomas M. Brown
- Department of Electronic Engineering University of Rome Tor Vergata Via del Politecnico 1 00133 Rome Italy
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6
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Targeting neuronal calcium channels and GSK3β for Alzheimer's disease with naturally-inspired Diels-Alder adducts. Bioorg Chem 2022; 129:106152. [PMID: 36155094 DOI: 10.1016/j.bioorg.2022.106152] [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: 07/26/2022] [Revised: 09/08/2022] [Accepted: 09/10/2022] [Indexed: 11/22/2022]
Abstract
The complexity of neurodegenerative diseases, among which Alzheimer's disease plays a pivotal role, poses one of the tough therapeutic challenges of present time. In this perspective, a multitarget approach appears as a promising strategy to simultaneously interfere with different defective pathways. In this paper, a structural simplification plan was performed on our previously reported multipotent polycyclic compounds, in order to obtain a simpler pharmacophoric central core with improved pharmacokinetic properties, while maintaining the modulating activity on neuronal calcium channels and glycogen synthase kinase 3-beta (GSK-3β), as validated targets to combat Alzheimer's disease. The molecular pruning approach applied here led to tetrahydroisoindole-dione (1), tetrahydromethanoisoindole-dione (2) and tetrahydroepoxyisoindole-dione (3) structures, easily affordable by Diels-Alder cycloaddition. Preliminary data indicated structure 3 as the most appropriate, thus a SAR study was performed by introducing different substituents, selected on the basis of the commercial availability of the furan derivatives required for the synthetic procedure. The results indicated compound 10 as a promising, structurally atypical, safe and BBB-penetrating Cav modulator, inhibiting both L- and N-calcium channels, likely responsible for the Ca2+ overload observed in Alzheimer's disease. In a multitarget perspective, compound 11 appeared as an effective prototype, endowed with improved Cav inhibitory activity, with respect to the reference drug nifedipine, and encouraging modulating activity on GSK-3β.
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7
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Diindolylmethane Derivatives: New Selective Blockers for T-Type Calcium Channels. MEMBRANES 2022; 12:membranes12080749. [PMID: 36005664 PMCID: PMC9412534 DOI: 10.3390/membranes12080749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 07/28/2022] [Accepted: 07/28/2022] [Indexed: 01/27/2023]
Abstract
The natural product indole-3-carbinol (I3C) and its major digestive product 3,3′-diindolylmethane (DIM) have shown clinical promise in multiple forms of cancer including breast cancer. In this study, we explored the calcium channel activity of DIM, its synthetic derivative 3,3′-Diindolylmethanone (DIM-one) and related I3C and DIM-one analogs. For the first time, DIM, DIM-one and analog IX were identified as selective blockers for T-type CaV3.3 (IC50s DIM 2.09 µM; DIM-one 9.07 µM) while compound IX inhibited both CaV3.2 (6.68 µM) and CaV3.3 (IC50 = 3.05 µM) using a FLIPR cell-based assay to measure inhibition of T-type calcium channel window current. Further characterization of DIM by electrophysiology revealed it inhibited inward Ca2+ current through CaV3.1 (IC50 = 8.32 µM) and CaV3.3 (IC50 = 9.63 µM), while IX partially blocked CaV3.2 and CaV3.3 inward Ca2+ current. In contrast, DIM-one preferentially blocked CaV3.1 inward Ca2+ current (IC50 = 1.53 µM). The anti-proliferative activities of these compounds revealed that oxidation of the methylene group of DIM shifted the selectivity of DIMs from breast cancer cell line MCF-7 to colon cancer cell line HT-29.
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8
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Cardoso FC, Schmit M, Kuiper MJ, Lewis RJ, Tuck KL, Duggan PJ. Inhibition of N-type calcium ion channels by tricyclic antidepressants - experimental and theoretical justification for their use for neuropathic pain. RSC Med Chem 2022; 13:183-195. [PMID: 35308021 PMCID: PMC8864487 DOI: 10.1039/d1md00331c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 12/20/2021] [Indexed: 11/21/2022] Open
Abstract
A number of tricyclic antidepressants (TCAs) are commonly prescribed off-label for the treatment of neuropathic pain. The blockade of neuronal calcium ion channels is often invoked to partially explain the analgesic activity of TCAs, but there has been very limited experimental or theoretical evidence reported to support this assertion. The N-type calcium ion channel (CaV2.2) is a well-established target for the treatment of neuropathic pain and in this study a series of eleven TCAs and two closely related drugs were shown to be moderately effective inhibitors of this channel when endogenously expressed in the SH-SY5Y neuroblastoma cell line. A homology model of the channel, which matches closely a recently reported Cryo-EM structure, was used to investigate via docking and molecular dynamics experiments the possible mode of inhibition of CaV2.2 channels by TCAs. Two closely related binding modes, that occur in the channel cavity that exists between the selectivity filter and the internal gate, were identified. The TCAs are predicted to position themselves such that their ammonium side chains interfere with the selectivity filter, with some, such as amitriptyline, also appearing to hinder the channel's ability to open. This study provides the most comprehensive evidence to date that supports the notion that the blockade of neuronal calcium ion channels by TCAs is at least partially responsible for their analgesic effect.
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Affiliation(s)
- Fernanda C Cardoso
- Institute for Molecular Bioscience, The University of Queensland St Lucia QLD 4072 Australia
| | - Matthieu Schmit
- School of Chemistry, Monash University Victoria 3800 Australia
- CSIRO Manufacturing Research Way Clayton Victoria 3168 Australia
| | | | - Richard J Lewis
- Institute for Molecular Bioscience, The University of Queensland St Lucia QLD 4072 Australia
| | - Kellie L Tuck
- School of Chemistry, Monash University Victoria 3800 Australia
| | - Peter J Duggan
- CSIRO Manufacturing Research Way Clayton Victoria 3168 Australia
- College of Science and Engineering, Flinders University Adelaide South Australia 5042 Australia
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9
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Sánchez Triviño CA, Landinez MP, Duran S, Gomez MDP, Nasi E. Modulation of Gq/PLC-Mediated Signaling by Acute Lithium Exposure. Front Cell Neurosci 2022; 16:838939. [PMID: 35242014 PMCID: PMC8885521 DOI: 10.3389/fncel.2022.838939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 01/27/2022] [Indexed: 11/13/2022] Open
Abstract
Although lithium has long been one of the most widely used pharmacological agents in psychiatry, its mechanisms of action at the cellular and molecular levels remain poorly understood. One of the targets of Li+ is the phosphoinositide pathway, but whereas the impact of Li+ on inositol lipid metabolism is well documented, information on physiological effects at the cellular level is lacking. We examined in two mammalian cell lines the effect of acute Li+ exposure on the mobilization of internal Ca2+ and phospholipase C (PLC)-dependent membrane conductances. We first corroborated by Western blots and immunofluorescence in HEK293 cells the presence of key signaling elements of a muscarinic PLC pathway (M1AchR, Gq, PLC-β1, and IP3Rs). Stimulation with carbachol evoked a dose-dependent mobilization of Ca, as determined with fluorescent indicators. This was due to release from internal stores and proved susceptible to the PLC antagonist U73122. Li+ exposure reproducibly potentiated the Ca response in a concentration-dependent manner extending to the low millimolar range. To broaden those observations to a neuronal context and probe potential Li modulation of electrical signaling, we next examined the cell line SHsy5y. We replicated the potentiating effects of Li on the mobilization of internal Ca, and, after characterizing the basic properties of the electrical response to cholinergic stimulation, we also demonstrated an equally robust upregulation of muscarinic membrane currents. Finally, by directly stimulating the signaling pathway at different links downstream of the receptor, the site of action of the observed Li effects could be narrowed down to the G protein and its interaction with PLC-β. These observations document a modulation of Gq/PLC/IP3-mediated signaling by acute exposure to lithium, reflected in distinct physiological changes in cellular responses.
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Affiliation(s)
- Cesar Adolfo Sánchez Triviño
- Departamento de Biología, Universidad Nacional de Colombia, Bogotá, Colombia
- Centro Internacional de Física, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Maria Paula Landinez
- Departamento de Biología, Universidad Nacional de Colombia, Bogotá, Colombia
- Centro Internacional de Física, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Sara Duran
- Departamento de Biología, Universidad Nacional de Colombia, Bogotá, Colombia
- Centro Internacional de Física, Universidad Nacional de Colombia, Bogotá, Colombia
| | - María Del Pilar Gomez
- Departamento de Biología, Universidad Nacional de Colombia, Bogotá, Colombia
- Marine Biological Laboratory, Woods Hole, MA, United States
| | - Enrico Nasi
- Marine Biological Laboratory, Woods Hole, MA, United States
- Instituto de Genética, Universidad Nacional de Colombia, Bogotá, Colombia
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10
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A Deep Learning Approach with Data Augmentation to Predict Novel Spider Neurotoxic Peptides. Int J Mol Sci 2021; 22:ijms222212291. [PMID: 34830173 PMCID: PMC8619404 DOI: 10.3390/ijms222212291] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/09/2021] [Accepted: 11/11/2021] [Indexed: 11/17/2022] Open
Abstract
As major components of spider venoms, neurotoxic peptides exhibit structural diversity, target specificity, and have great pharmaceutical potential. Deep learning may be an alternative to the laborious and time-consuming methods for identifying these peptides. However, the major hurdle in developing a deep learning model is the limited data on neurotoxic peptides. Here, we present a peptide data augmentation method that improves the recognition of neurotoxic peptides via a convolutional neural network model. The neurotoxic peptides were augmented with the known neurotoxic peptides from UniProt database, and the models were trained using a training set with or without the generated sequences to verify the augmented data. The model trained with the augmented dataset outperformed the one with the unaugmented dataset, achieving accuracy of 0.9953, precision of 0.9922, recall of 0.9984, and F1 score of 0.9953 in simulation dataset. From the set of all RNA transcripts of Callobius koreanus spider, we discovered neurotoxic peptides via the model, resulting in 275 putative peptides of which 252 novel sequences and only 23 sequences showing homology with the known peptides by Basic Local Alignment Search Tool. Among these 275 peptides, four were selected and shown to have neuromodulatory effects on the human neuroblastoma cell line SH-SY5Y. The augmentation method presented here may be applied to the identification of other functional peptides from biological resources with insufficient data.
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11
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Zohar K, Lezmi E, Eliyahu T, Linial M. Ladostigil Attenuates Induced Oxidative Stress in Human Neuroblast-like SH-SY5Y Cells. Biomedicines 2021; 9:biomedicines9091251. [PMID: 34572436 PMCID: PMC8471141 DOI: 10.3390/biomedicines9091251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/14/2021] [Accepted: 09/16/2021] [Indexed: 12/13/2022] Open
Abstract
A hallmark of the aging brain is the robust inflammation mediated by microglial activation. Pathophysiology of common neurodegenerative diseases involves oxidative stress and neuroinflammation. Chronic treatment of aging rats by ladostigil, a compound with antioxidant and anti-inflammatory function, prevented microglial activation and learning deficits. In this study, we further investigate the effect of ladostigil on undifferentiated SH-SY5Y cells. We show that SH-SY5Y cells exposed to acute (by H2O2) or chronic oxidative stress (by Sin1, 3-morpholinosydnonimine) induced apoptotic cell death. However, in the presence of ladostigil, the decline in cell viability and the increase of oxidative levels were partially reversed. RNA-seq analysis showed that prolonged oxidation by Sin1 resulted in a simultaneous reduction of the expression level of endoplasmic reticulum (ER) genes that participate in proteostasis. By comparing the differential gene expression profile of Sin1 treated cells to cells incubated with ladostigil before being exposed to Sin1, we observed an over-expression of Clk1 (Cdc2-like kinase 1) which was implicated in psychophysiological stress in mice and Alzheimer’s disease. Ladostigil also suppressed the expression of Ccpg1 (Cell cycle progression 1) and Synj1 (Synaptojanin 1) that are involved in ER-autophagy and endocytic pathways. We postulate that ladostigil alleviated cell damage induced by oxidation. Therefore, under conditions of chronic stress that are observed in the aging brain, ladostigil may block oxidative stress processes and consequently reduce neurotoxicity.
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Affiliation(s)
- Keren Zohar
- Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel; (K.Z.); (T.E.)
| | - Elyad Lezmi
- Department of Genetics, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;
| | - Tsiona Eliyahu
- Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel; (K.Z.); (T.E.)
| | - Michal Linial
- Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel; (K.Z.); (T.E.)
- Correspondence:
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Cell-Based Reporter Release Assay to Determine the Activity of Calcium-Dependent Neurotoxins and Neuroactive Pharmaceuticals. Toxins (Basel) 2021; 13:toxins13040247. [PMID: 33808507 PMCID: PMC8066854 DOI: 10.3390/toxins13040247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/25/2021] [Accepted: 03/29/2021] [Indexed: 11/26/2022] Open
Abstract
The suitability of a newly developed cell-based functional assay was tested for the detection of the activity of a range of neurotoxins and neuroactive pharmaceuticals which act by stimulation or inhibition of calcium-dependent neurotransmitter release. In this functional assay, a reporter enzyme is released concomitantly with the neurotransmitter from neurosecretory vesicles. The current study showed that the release of a luciferase from a differentiated human neuroblastoma-based reporter cell line (SIMA-hPOMC1-26-GLuc cells) can be stimulated by a carbachol-mediated activation of the Gq-coupled muscarinic-acetylcholine receptor and by the Ca2+-channel forming spider toxin α-latrotoxin. Carbachol-stimulated luciferase release was completely inhibited by the muscarinic acetylcholine receptor antagonist atropine and α-latrotoxin-mediated release by the Ca2+-chelator EGTA, demonstrating the specificity of luciferase-release stimulation. SIMA-hPOMC1-26-GLuc cells express mainly L- and N-type and to a lesser extent T-type VGCC on the mRNA and protein level. In accordance with the expression profile a depolarization-stimulated luciferase release by a high K+-buffer was effectively and dose-dependently inhibited by L-type VGCC inhibitors and to a lesser extent by N-type and T-type inhibitors. P/Q- and R-type inhibitors did not affect the K+-stimulated luciferase release. In summary, the newly established cell-based assay may represent a versatile tool to analyze the biological efficiency of a range of neurotoxins and neuroactive pharmaceuticals which mediate their activity by the modulation of calcium-dependent neurotransmitter release.
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Ramesh G, Jarzembowski L, Schwarz Y, Poth V, Konrad M, Knapp ML, Schwär G, Lauer AA, Grimm MOW, Alansary D, Bruns D, Niemeyer BA. A short isoform of STIM1 confers frequency-dependent synaptic enhancement. Cell Rep 2021; 34:108844. [PMID: 33730587 DOI: 10.1016/j.celrep.2021.108844] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 12/16/2020] [Accepted: 02/17/2021] [Indexed: 12/25/2022] Open
Abstract
Store-operated Ca2+-entry (SOCE) regulates basal and receptor-triggered Ca2+ signaling with STIM proteins sensing the endoplasmic reticulum (ER) Ca2+ content and triggering Ca2+ entry by gating Orai channels. Although crucial for immune cells, STIM1's role in neuronal Ca2+ homeostasis is controversial. Here, we characterize a splice variant, STIM1B, which shows exclusive neuronal expression and protein content surpassing conventional STIM1 in cerebellum and of significant abundance in other brain regions. STIM1B expression results in a truncated protein with slower kinetics of ER-plasma membrane (PM) cluster formation and ICRAC, as well as reduced inactivation. In primary wild-type neurons, STIM1B is targeted by its spliced-in domain B to presynaptic sites where it converts classic synaptic depression into Ca2+- and Orai-dependent short-term synaptic enhancement (STE) at high-frequency stimulation (HFS). In conjunction with altered STIM1 splicing in human Alzheimer disease, our findings highlight STIM1 splicing as an important regulator of neuronal calcium homeostasis and of synaptic plasticity.
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Affiliation(s)
- Girish Ramesh
- Molecular Biophysics, Saarland University, 66421 Homburg, Germany
| | | | - Yvonne Schwarz
- Molecular Neurophysiology, Saarland University, 66421 Homburg, Germany
| | - Vanessa Poth
- Molecular Biophysics, Saarland University, 66421 Homburg, Germany
| | - Maik Konrad
- Molecular Biophysics, Saarland University, 66421 Homburg, Germany
| | - Mona L Knapp
- Molecular Biophysics, Saarland University, 66421 Homburg, Germany
| | - Gertrud Schwär
- Biophysics, Center for Integrative Physiology and Molecular Medicine (CIPMM), Bld. 48, Saarland University, 66421 Homburg, Germany
| | - Anna A Lauer
- Experimental Neurology, Saarland University, 66421 Homburg, Germany
| | - Marcus O W Grimm
- Experimental Neurology, Saarland University, 66421 Homburg, Germany
| | - Dalia Alansary
- Molecular Biophysics, Saarland University, 66421 Homburg, Germany
| | - Dieter Bruns
- Molecular Neurophysiology, Saarland University, 66421 Homburg, Germany
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Hwang IW, Shin MK, Lee YJ, Kim ST, Lee SY, Lee B, Jang W, Yeo JH, Lee S, Sung JS. N-type Cav channel inhibition by spider venom peptide of Argiope bruennichi. Mol Cell Toxicol 2021. [DOI: 10.1007/s13273-020-00109-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Khuansuwan S, Barnhill LM, Cheng S, Bronstein JM. A novel transgenic zebrafish line allows for in vivo quantification of autophagic activity in neurons. Autophagy 2019; 15:1322-1332. [PMID: 30755067 PMCID: PMC6613892 DOI: 10.1080/15548627.2019.1580511] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 01/03/2019] [Accepted: 01/11/2019] [Indexed: 12/22/2022] Open
Abstract
The pathophysiology of most neurodegenerative diseases includes aberrant accumulation of protein aggregates. Recent evidence highlights the role of protein degradation pathways in neurodegeneration. Concurrently, genetic tools have been generated to enable zebrafish, Danio rerio, to be used as an animal model to study neurodegenerative processes. In addition to optical clarity and fast ex utero development, the zebrafish brain is relatively small and has conserved structures with its mammalian counterparts. To take advantage of this model organism and to aid further studies on autophagy and neurodegeneration, we created a stable transgenic zebrafish line that expresses eGFP-Map1lc3b specifically in post-mitotic neurons under the elavl3 promoter. This line is useful for indirectly monitoring autophagic activity in neurons in vivo and screening for macroautophagy/autophagy-modulating compounds. We determined the applicability of this transgenic line by modulating and quantifying the number of autophagosomes via treatment with a known autophagy inducer (rapamycin) and inhibitors (3-methyladenine, protease inhibitors). Additionally, we proposed an in vivo method for quantifying rates of autophagosome accumulation, which can be used to infer occurrence of autophagic flux. Last, we tested two FDA-approved drugs currently undergoing clinical studies for Parkinson disease, isradipine and nilotinib, and found that isradipine did not modulate autophagy, whereas nilotinib induced both autophagosome number and autophagic flux. It is hoped that others will find this line useful as an in vivo vertebrate model to find or validate autophagy modulators that might be used to halt the progression of neurodegenerative diseases. Abbreviations: 3MA: 3-methyladenine; BafA: bafilomycin A1; dd: dorsal diencephalon; dpf: days post fertilization; e: eye; eGFP: enhanced green fluorescent protein; Elavl3: ELAV like neuron-specific RNA binding protein 3; FDA: Food and Drug Administration; hb: habenula; hpt, hours post treatment; Map1lc3b: microtubule-associated protein 1 light chain 3 beta; nt: neural tube; ot, optic tectum; P/E: pepstatin A and E64d; PD: Parkinson disease; PMTs: photomultiplier tubes; PTU: 1-phenyl-2-thiourea; Ta: annealing temperature; Tel, telencephalon.
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Affiliation(s)
- Sataree Khuansuwan
- Department of Neurology, University of California at Los Angeles, Los Angeles, CA, USA
| | - Lisa M. Barnhill
- Department of Neurology, University of California at Los Angeles, Los Angeles, CA, USA
- Molecular Toxicology Program, University of California at Los Angeles, Los Angeles, CA, USA
| | - Sizhu Cheng
- UCLA Undergraduate Interdepartmental Program for Neuroscience, University of California at Los Angeles, Los Angeles, CA, USA
| | - Jeff M. Bronstein
- Department of Neurology, University of California at Los Angeles, Los Angeles, CA, USA
- Molecular Toxicology Program, University of California at Los Angeles, Los Angeles, CA, USA
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Novel conorfamides from Conus austini venom modulate both nicotinic acetylcholine receptors and acid-sensing ion channels. Biochem Pharmacol 2019; 164:342-348. [PMID: 31028742 DOI: 10.1016/j.bcp.2019.04.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 04/22/2019] [Indexed: 01/06/2023]
Abstract
Conorfamides are a poorly studied family of cone snail venom peptides with broad biological activities, including inhibition of glutamate receptors, acid-sensing ion channels, and voltage-gated potassium channels. The aim of this study was to characterize the pharmacological activity of two novel linear conorfamides (conorfamide_As1a and conorfamide_As2a) and their non-amidated counterparts (conopeptide_As1b and conopeptide_As2b) that were isolated from the venom of the Mexican cone snail Conus austini. Although As1a, As2a, As1b and As2b were identified by activity-guided fractionation using a high-throughput fluorescence imaging plate reader (FLIPR) assay assessing α7 nAChR activity, sequence determination revealed activity associated with four linear peptides of the conorfamide rather than the anticipated α-conotoxin family. Pharmacological testing revealed that the amidated peptide variants altered desensitization of acid-sensing ion channels (ASICs) 1a and 3, and the native lysine to arginine mutation differentiating As1a and As1b from As2a and As2b introduced ASIC1a peak current potentiation. Surprisingly, these conorfamides also inhibited α7 and muscle-type nicotinic acetylcholine receptors (nAChR) at nanomolar concentrations. This is the first report of conorfamides with dual activity, with the nAChR activity being the most potent molecular target of any conorfamide discovered to date.
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Ziegman R, Brust A, Jha P, Cardoso FC, Lewis RJ, Alewood PF. 'Messy' Processing of χ-conotoxin MrIA Generates Homologues with Reduced hNET Potency. Mar Drugs 2019; 17:md17030165. [PMID: 30875751 PMCID: PMC6470548 DOI: 10.3390/md17030165] [Citation(s) in RCA: 5] [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: 02/01/2019] [Revised: 02/26/2019] [Accepted: 03/12/2019] [Indexed: 12/14/2022] Open
Abstract
Integrated venomics techniques have shown that variable processing of conotoxins from Conus marmoreus resulted in a dramatic expansion in the number of expressed conotoxins. One conotoxin from C. marmoreus, the χ-conotoxin MrIA, is a selective inhibitor of human norepinephrine transporters (hNET) and therefore a drug candidate for attenuating chronic neuropathic pain. It has been found that “messy” processing of the MrIA transcripts results in the expression of MrIA analogs with different truncations of the pro-peptide that contains portions of the MrIA molecule. The aim of this study was to investigate if variable processing of the expressed peptides results in modulation of the existing hNET pharmacology or creates new pharmacologies. To this end, a number of MrIA analogs found in C. marmoreus venom were synthesized and evaluated for their activity at hNET receptors. While several of the analogs exhibited norepinephrine transporter inhibitory activity comparable to that of MrIA, none significantly improved on the potency of conotoxin MrIA, and those analogs with disrupted pharmacophores produced greatly reduced NET inhibition, confirming previous structure-activity relationships seen on χ-class conopeptides. Additionally, analogs were screened for new activities on ion channels using calcium influx assays, although no major new pharmacology was revealed.
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Affiliation(s)
- Rebekah Ziegman
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia.
| | - Andreas Brust
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia.
| | - Prerna Jha
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia.
| | - Fernanda C Cardoso
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia.
| | - Richard J Lewis
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia.
| | - Paul F Alewood
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia.
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18
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Polycyclic maleimide-based derivatives as first dual modulators of neuronal calcium channels and GSK-3β for Alzheimer's disease treatment. Eur J Med Chem 2019; 163:394-402. [DOI: 10.1016/j.ejmech.2018.12.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 11/30/2018] [Accepted: 12/02/2018] [Indexed: 01/06/2023]
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19
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Wang D, Neupane P, Ragnarsson L, Capon RJ, Lewis RJ. Synthesis of Pseudellone Analogs and Characterization as Novel T-type Calcium Channel Blockers. Mar Drugs 2018; 16:md16120475. [PMID: 30487473 PMCID: PMC6315694 DOI: 10.3390/md16120475] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 11/21/2018] [Accepted: 11/26/2018] [Indexed: 11/16/2022] Open
Abstract
T-type calcium channel (CaV3.x) blockers are receiving increasing attention as potential therapeutics for the treatment of pathophysiological disorders and diseases, including absence epilepsy, Parkinson's disease (PD), hypertension, cardiovascular diseases, cancers, and pain. However, few clinically approved CaV3.x blockers are available, and selective pharmacological tools are needed to further unravel the roles of individual CaV3.x subtypes. In this work, through an efficient synthetic route to the marine fungal product pseudellone C, we obtained bisindole alkaloid analogs of pseudellone C with a modified tryptophan moiety and identified two CaV3.2 (2, IC50 = 18.24 µM; 3, IC50 = 6.59 µM) and CaV3.3 (2, IC50 = 7.71 µM; 3, IC50 = 3.81 µM) selective blockers using a FLIPR cell-based assay measuring CaV3.x window currents. Further characterization by whole-cell patch-clamp revealed a preferential block of CaV3.1 activated current (2, IC50 = 5.60 µM; 3, IC50 = 9.91 µM), suggesting their state-dependent block is subtype specific.
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Affiliation(s)
- Dan Wang
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, the University of Queensland, Brisbane, Qld 4072, Australia.
| | - Pratik Neupane
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, the University of Queensland, Brisbane, Qld 4072, Australia.
| | - Lotten Ragnarsson
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, the University of Queensland, Brisbane, Qld 4072, Australia.
| | - Robert J Capon
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, the University of Queensland, Brisbane, Qld 4072, Australia.
| | - Richard J Lewis
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, the University of Queensland, Brisbane, Qld 4072, Australia.
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20
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Sousa SR, McArthur JR, Brust A, Bhola RF, Rosengren KJ, Ragnarsson L, Dutertre S, Alewood PF, Christie MJ, Adams DJ, Vetter I, Lewis RJ. Novel analgesic ω-conotoxins from the vermivorous cone snail Conus moncuri provide new insights into the evolution of conopeptides. Sci Rep 2018; 8:13397. [PMID: 30194442 PMCID: PMC6128854 DOI: 10.1038/s41598-018-31245-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 08/07/2018] [Indexed: 12/28/2022] Open
Abstract
Cone snails are a diverse group of predatory marine invertebrates that deploy remarkably complex venoms to rapidly paralyse worm, mollusc or fish prey. ω-Conotoxins are neurotoxic peptides from cone snail venoms that inhibit Cav2.2 voltage-gated calcium channel, demonstrating potential for pain management via intrathecal (IT) administration. Here, we isolated and characterized two novel ω-conotoxins, MoVIA and MoVIB from Conus moncuri, the first to be identified in vermivorous (worm-hunting) cone snails. MoVIA and MoVIB potently inhibited human Cav2.2 in fluorimetric assays and rat Cav2.2 in patch clamp studies, and both potently displaced radiolabeled ω-conotoxin GVIA (125I-GVIA) from human SH-SY5Y cells and fish brain membranes (IC50 2–9 pM). Intriguingly, an arginine at position 13 in MoVIA and MoVIB replaced the functionally critical tyrosine found in piscivorous ω-conotoxins. To investigate its role, we synthesized MoVIB-[R13Y] and MVIIA-[Y13R]. Interestingly, MVIIA-[Y13R] completely lost Cav2.2 activity and MoVIB-[R13Y] had reduced activity, indicating that Arg at position 13 was preferred in these vermivorous ω-conotoxins whereas tyrosine 13 is preferred in piscivorous ω-conotoxins. MoVIB reversed pain behavior in a rat neuropathic pain model, confirming that vermivorous cone snails are a new source of analgesic ω-conotoxins. Given vermivorous cone snails are ancestral to piscivorous species, our findings support the repurposing of defensive venom peptides in the evolution of piscivorous Conidae.
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Affiliation(s)
- Silmara R Sousa
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Jeffrey R McArthur
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Andreas Brust
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Rebecca F Bhola
- Discipline of Pharmacology, The University of Sydney, Sydney, NSW, 2006, Australia
| | - K Johan Rosengren
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Lotten Ragnarsson
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Sebastien Dutertre
- Institut des Biomolécules Max Mousseron, UMR 5247, Université Montpellier - CNRS, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
| | - Paul F Alewood
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Macdonald J Christie
- Discipline of Pharmacology, The University of Sydney, Sydney, NSW, 2006, Australia
| | - David J Adams
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Irina Vetter
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia.,School of Pharmacy, The University of Queensland, Brisbane, QLD, 4102, Australia
| | - Richard J Lewis
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia.
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STIM1 deficiency is linked to Alzheimer's disease and triggers cell death in SH-SY5Y cells by upregulation of L-type voltage-operated Ca 2+ entry. J Mol Med (Berl) 2018; 96:1061-1079. [PMID: 30088035 PMCID: PMC6133163 DOI: 10.1007/s00109-018-1677-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 07/18/2018] [Accepted: 07/24/2018] [Indexed: 12/14/2022]
Abstract
Abstract STIM1 is an endoplasmic reticulum protein with a role in Ca2+ mobilization and signaling. As a sensor of intraluminal Ca2+ levels, STIM1 modulates plasma membrane Ca2+ channels to regulate Ca2+ entry. In neuroblastoma SH-SY5Y cells and in familial Alzheimer’s disease patient skin fibroblasts, STIM1 is cleaved at the transmembrane domain by the presenilin-1-associated γ-secretase, leading to dysregulation of Ca2+ homeostasis. In this report, we investigated expression levels of STIM1 in brain tissues (medium frontal gyrus) of pathologically confirmed Alzheimer’s disease patients, and observed that STIM1 protein expression level decreased with the progression of neurodegeneration. To study the role of STIM1 in neurodegeneration, a strategy was designed to knock-out the expression of STIM1 gene in the SH-SY5Y neuroblastoma cell line by CRISPR/Cas9-mediated genome editing, as an in vitro model to examine the phenotype of STIM1-deficient neuronal cells. It was proved that, while STIM1 is not required for the differentiation of SH-SY5Y cells, it is absolutely essential for cell survival in differentiating cells. Differentiated STIM1-KO cells showed a significant decrease of mitochondrial respiratory chain complex I activity, mitochondrial inner membrane depolarization, reduced mitochondrial free Ca2+ concentration, and higher levels of senescence as compared with wild-type cells. In parallel, STIM1-KO cells showed a potentiated Ca2+ entry in response to depolarization, which was sensitive to nifedipine, pointing to L-type voltage-operated Ca2+ channels as mediators of the upregulated Ca2+ entry. The stable knocking-down of CACNA1C transcripts restored mitochondrial function, increased mitochondrial Ca2+ levels, and dropped senescence to basal levels, demonstrating the essential role of the upregulation of voltage-operated Ca2+ entry through Cav1.2 channels in STIM1-deficient SH-SY5Y cell death. Key messages STIM1 protein expression decreases with the progression of neurodegeneration in Alzheimer’s disease. STIM1 is essential for cell viability in differentiated SH-SY5Y cells. STIM1 deficiency triggers voltage-regulated Ca2+ entry-dependent cell death. Mitochondrial dysfunction and senescence are features of STIM1-deficient differentiated cells.
Electronic supplementary material The online version of this article (10.1007/s00109-018-1677-y) contains supplementary material, which is available to authorized users.
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22
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A novel variant in TAF1 affects gene expression and is associated with X-linked TAF1 intellectual disability syndrome. Neuronal Signal 2018; 2:NS20180141. [PMID: 32714589 PMCID: PMC7373232 DOI: 10.1042/ns20180141] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 06/18/2018] [Accepted: 06/25/2018] [Indexed: 12/25/2022] Open
Abstract
We investigated the genome of a 5-year-old male who presented with global developmental delay (motor, cognitive, and speech), hypotonia, possibly ataxia, and cerebellar hypoplasia of unknown origin. Whole genome sequencing (WGS) and mRNA sequencing (RNA-seq) were performed on a family having an affected proband, his unaffected parents, and maternal grandfather. To explore the molecular and functional consequences of the variant, we performed cell proliferation assays, quantitative real-time PCR (qRT-PCR) array, immunoblotting, calcium imaging, and neurite outgrowth experiments in SH-SY5Y neuroblastoma cells to compare the properties of the wild-type TATA-box-binding protein factor 1 (TAF1), deletion of TAF1, and TAF1 variant p.Ser1600Gly samples. The whole genome data identified several gene variants. However, the genome sequence data failed to implicate a candidate gene as many of the variants were of unknown significance. By combining genome sequence data with transcriptomic data, a probable candidate variant, p.Ser1600Gly, emerged in TAF1. Moreover, the RNA-seq data revealed a 90:10 extremely skewed X-chromosome inactivation (XCI) in the mother. Our results showed that neuronal ion channel genes were differentially expressed between TAF1 deletion and TAF1 variant p.Ser1600Gly cells, when compared with their respective controls, and that the TAF1 variant may impair neuronal differentiation and cell proliferation. Taken together, our data suggest that this novel variant in TAF1 plays a key role in the development of a recently described X-linked syndrome, TAF1 intellectual disability syndrome, and further extends our knowledge of a potential link between TAF1 deficiency and defects in neuronal cell function.
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Sairaman A, Cardoso FC, Bispat A, Lewis RJ, Duggan PJ, Tuck KL. Synthesis and evaluation of aminobenzothiazoles as blockers of N- and T-type calcium channels. Bioorg Med Chem 2018; 26:3046-3059. [DOI: 10.1016/j.bmc.2018.03.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 03/15/2018] [Accepted: 03/18/2018] [Indexed: 10/17/2022]
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Snutch TP, Zamponi GW. Recent advances in the development of T-type calcium channel blockers for pain intervention. Br J Pharmacol 2018; 175:2375-2383. [PMID: 28608534 PMCID: PMC5980537 DOI: 10.1111/bph.13906] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 05/19/2017] [Accepted: 06/05/2017] [Indexed: 01/15/2023] Open
Abstract
Cav 3.2 T-type calcium channels are important regulators of pain signals in the afferent pain pathway, and their activities are dysregulated during various chronic pain states. Therefore, it is reasonable to predict that inhibiting T-type calcium channels in dorsal root ganglion neurons and in the spinal dorsal horn can be targeted for pain relief. This is supported by early pharmacological studies with T-type channel blockers, such as ethosuximide, and by analgesic effects of siRNA depletion of Cav 3.2 channels. In the past 5 years, considerable effort has been applied towards identifying novel classes of T-type calcium channel blockers. Here, we review recent developments in the discovery of novel classes of T-type calcium channel blockers, and their analgesic effects in animal models of pain and in clinical trials. LINKED ARTICLES This article is part of a themed section on Recent Advances in Targeting Ion Channels to Treat Chronic Pain. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v175.12/issuetoc.
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Affiliation(s)
- Terrance P Snutch
- Michael Smith Laboratories and Djavad Mowafaghian Centre for Brain HealthUniversity of British ColumbiaVancouverBCCanada
| | - Gerald W Zamponi
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Alberta Children's Hospital Research Institute, Cumming School of MedicineUniversity of CalgaryCalgaryABCanada
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25
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Stevenson RJ, Azimi I, Flanagan JU, Inserra M, Vetter I, Monteith GR, Denny WA. An SAR study of hydroxy-trifluoromethylpyrazolines as inhibitors of Orai1-mediated store operated Ca 2+ entry in MDA-MB-231 breast cancer cells using a convenient Fluorescence Imaging Plate Reader assay. Bioorg Med Chem 2018; 26:3406-3413. [PMID: 29776832 DOI: 10.1016/j.bmc.2018.05.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 05/01/2018] [Accepted: 05/08/2018] [Indexed: 12/30/2022]
Abstract
The proteins Orai1 and STIM1 control store-operated Ca2+ entry (SOCE) into cells. SOCE is important for migration, invasion and metastasis of MDA-MB-231 human triple negative breast cancer (TNBC) cells and has been proposed as a target for cancer drug discovery. Two hit compounds from a medium throughput screen, displayed encouraging inhibition of SOCE in MDA-MB-231 cells, as measured by a Fluorescence Imaging Plate Reader (FLIPR) Ca2+ assay. Following NMR spectroscopic analysis of these hits and reassignment of their structures as 5-hydroxy-5-trifluoromethylpyrazolines, a series of analogues was prepared via thermal condensation reactions between substituted acylhydrazones and trifluoromethyl 1,3-dicarbonyl arenes. Structure-activity relationship (SAR) studies showed that small lipophilic substituents at the 2- and 3-positions of the RHS and 2-, 3- and 4-postions of the LHS terminal benzene rings improved activity, resulting in a novel class of potent and selective inhibitors of SOCE.
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Affiliation(s)
- Ralph J Stevenson
- Auckland Cancer Society Research Centre, School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
| | - Iman Azimi
- The School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia; Mater Research Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; Division of Pharmacy, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia
| | - Jack U Flanagan
- Auckland Cancer Society Research Centre, School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Marco Inserra
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia; School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia
| | - Irina Vetter
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia; School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia
| | - Gregory R Monteith
- The School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia; Mater Research Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - William A Denny
- Auckland Cancer Society Research Centre, School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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Avola R, Graziano ACE, Pannuzzo G, Albouchi F, Cardile V. New insights on Parkinson's disease from differentiation of SH-SY5Y into dopaminergic neurons: An involvement of aquaporin4 and 9. Mol Cell Neurosci 2018; 88:212-221. [PMID: 29428877 DOI: 10.1016/j.mcn.2018.02.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 07/16/2017] [Accepted: 02/07/2018] [Indexed: 12/30/2022] Open
Abstract
The purpose of this research was to explore the behavior of aquaporins (AQPs) in an in vitro model of Parkinson's disease that is a recurrent neurodegenerative disorder caused by the gradual, progressive loss of dopaminergic neurons in the substantia nigra pars compacta. Because of postmortem studies have provided evidences for oxidative damage and alteration of water flow and energy metabolism, we carried out an investigation about AQP4 and 9, demonstrated in the brain to maintain water and energy homeostasis. As an appropriate in vitro cell model, we used SH-SY5Y cultures and induced their differentiation into a mature dopaminergic neuron phenotype with retinoic acid (RA) alone or in association with phorbol-12-myristate-13-acetate (MPA). The association RA plus MPA provided the most complete and mature neuron phenotype, as demonstrated by high levels of β-Tubulin III, MAP-2, and tyrosine hydroxylase. After validation of cell differentiation, the neurotoxin 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP) and H2O2 were applied to reproduce a Parkinson's-like stress. The results confirmed RA/MPA differentiated SH-SY5Y as a useful in vitro system for studying neurotoxicity and for using in a MPTP and H2O2-induced Parkinson's disease cell model. Moreover, the data demonstrated that neuronal differentiation, neurotoxicity, neuroinflammation, and oxidative stress are strongly correlated with dynamic changes of AQP4 and 9 transcription and transduction. New in vitro and in vivo experiments are needed to confirm these innovative outcomes.
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Affiliation(s)
- Rosanna Avola
- Department of Biomedical and Biotechnological Science, Section of Physiology, University of Catania, Via Santa Sofia, 97-95123 Catania, Italy.
| | - Adriana Carol Eleonora Graziano
- Department of Biomedical and Biotechnological Science, Section of Physiology, University of Catania, Via Santa Sofia, 97-95123 Catania, Italy.
| | - Giovanna Pannuzzo
- Department of Biomedical and Biotechnological Science, Section of Physiology, University of Catania, Via Santa Sofia, 97-95123 Catania, Italy
| | - Ferdaous Albouchi
- Laboratoire Materiaux Molecules et Applications, Institut Preparatoire au Etude Scientifique et Technique, Faculty of Sciences of Bizerte, University of Carthage, La Marsa, 2070 Tunis, Tunisia
| | - Venera Cardile
- Department of Biomedical and Biotechnological Science, Section of Physiology, University of Catania, Via Santa Sofia, 97-95123 Catania, Italy.
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Heusinkveld HJ, Westerink RH. Comparison of different in vitro cell models for the assessment of pesticide-induced dopaminergic neurotoxicity. Toxicol In Vitro 2017; 45:81-88. [DOI: 10.1016/j.tiv.2017.07.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 05/17/2017] [Accepted: 07/29/2017] [Indexed: 01/10/2023]
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Abstract
Crotalphine is a structural analogue to a novel analgesic peptide that was first identified in the crude venom from the South American rattlesnake Crotalus durissus terrificus. Although crotalphine's analgesic effect is well established, its direct mechanism of action remains unresolved. The aim of the present study was to investigate the effect of crotalphine on ion channels in peripheral pain pathways. We found that picomolar concentrations of crotalphine selectively activate heterologously expressed and native TRPA1 ion channels. TRPA1 activation by crotalphine required intact N-terminal cysteine residues and was followed by strong and long-lasting desensitization of the channel. Homologous desensitization of recombinant TRPA1 and heterologous desensitization in cultured dorsal root ganglia neurons was observed. Likewise, crotalphine acted on peptidergic TRPA1-expressing nerve endings ex vivo as demonstrated by suppression of calcitonin gene-related peptide release from the trachea and in vivo by inhibition of chemically induced and inflammatory hypersensitivity in mice. The crotalphine-mediated desensitizing effect was abolished by the TRPA1 blocker HC030031 and absent in TRPA1-deficient mice. Taken together, these results suggest that crotalphine is the first peptide to mediate antinociception selectively and at subnanomolar concentrations by targeting TRPA1 ion channels.
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Troeira Henriques S, Lawrence N, Chaousis S, Ravipati AS, Cheneval O, Benfield AH, Elliott AG, Kavanagh AM, Cooper MA, Chan LY, Huang YH, Craik DJ. Redesigned Spider Peptide with Improved Antimicrobial and Anticancer Properties. ACS Chem Biol 2017; 12:2324-2334. [PMID: 28741926 DOI: 10.1021/acschembio.7b00459] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Gomesin, a disulfide-rich antimicrobial peptide produced by the Brazilian spider Acanthoscurria gomesiana, has been shown to be potent against Gram-negative bacteria and to possess selective anticancer properties against melanoma cells. In a recent study, a backbone cyclized analogue of gomesin was shown to be as active but more stable than its native form. In the current study, we were interested in improving the antimicrobial properties of the cyclic gomesin, understanding its selectivity toward melanoma cells and elucidating its antimicrobial and anticancer mode of action. Rationally designed analogues of cyclic gomesin were examined for their antimicrobial potency, selectivity toward cancer cells, membrane-binding affinity, and ability to disrupt cell and model membranes. We improved the activity of cyclic gomesin by ∼10-fold against tested Gram-negative and Gram-positive bacteria without increasing toxicity to human red blood cells. In addition, we showed that gomesin and its analogues are more toxic toward melanoma and leukemia cells than toward red blood cells and act by selectively targeting and disrupting cancer cell membranes. Preference toward some cancer types is likely dependent on their different cell membrane properties. Our findings highlight the potential of peptides as antimicrobial and anticancer leads and the importance of selectively targeting cancer cell membranes for drug development.
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Affiliation(s)
- Sónia Troeira Henriques
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Nicole Lawrence
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Stephanie Chaousis
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Anjaneya S. Ravipati
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Olivier Cheneval
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Aurélie H. Benfield
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Alysha G. Elliott
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Angela Maria Kavanagh
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Matthew A. Cooper
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Lai Yue Chan
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Yen-Hua Huang
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - David J. Craik
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
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Sousa SR, Wingerd JS, Brust A, Bladen C, Ragnarsson L, Herzig V, Deuis JR, Dutertre S, Vetter I, Zamponi GW, King GF, Alewood PF, Lewis RJ. Discovery and mode of action of a novel analgesic β-toxin from the African spider Ceratogyrus darlingi. PLoS One 2017; 12:e0182848. [PMID: 28880874 PMCID: PMC5589098 DOI: 10.1371/journal.pone.0182848] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 07/25/2017] [Indexed: 01/13/2023] Open
Abstract
Spider venoms are rich sources of peptidic ion channel modulators with important therapeutical potential. We screened a panel of 60 spider venoms to find modulators of ion channels involved in pain transmission. We isolated, synthesized and pharmacologically characterized Cd1a, a novel peptide from the venom of the spider Ceratogyrus darlingi. Cd1a reversibly paralysed sheep blowflies (PD50 of 1318 pmol/g) and inhibited human Cav2.2 (IC50 2.6 μM) but not Cav1.3 or Cav3.1 (IC50 > 30 μM) in fluorimetric assays. In patch-clamp electrophysiological assays Cd1a inhibited rat Cav2.2 with similar potency (IC50 3 μM) without influencing the voltage dependence of Cav2.2 activation gating, suggesting that Cd1a doesn’t act on Cav2.2 as a classical gating modifier toxin. The Cd1a binding site on Cav2.2 did not overlap with that of the pore blocker ω-conotoxin GVIA, but its activity at Cav2.2-mutant indicated that Cd1a shares some molecular determinants with GVIA and MVIIA, localized near the pore region. Cd1a also inhibited human Nav1.1–1.2 and Nav1.7–1.8 (IC50 0.1–6.9 μM) but not Nav1.3–1.6 (IC50 > 30 μM) in fluorimetric assays. In patch-clamp assays, Cd1a strongly inhibited human Nav1.7 (IC50 16 nM) and produced a 29 mV depolarising shift in Nav1.7 voltage dependence of activation. Cd1a (400 pmol) fully reversed Nav1.7-evoked pain behaviours in mice without producing side effects. In conclusion, Cd1a inhibited two anti-nociceptive targets, appearing to interfere with Cav2.2 inactivation gating, associated with the Cav2.2 α-subunit pore, while altering the activation gating of Nav1.7. Cd1a was inactive at some of the Nav and Cav channels expressed in skeletal and cardiac muscles and nodes of Ranvier, apparently contributing to the lack of side effects at efficacious doses, and suggesting potential as a lead for development of peripheral pain treatments.
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Affiliation(s)
- Silmara R. Sousa
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Joshua S. Wingerd
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Andreas Brust
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Christopher Bladen
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Alberta Children’s Hospital Research Institute, The University of Calgary, Calgary, Canada
| | - Lotten Ragnarsson
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Volker Herzig
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Jennifer R. Deuis
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Sebastien Dutertre
- Institut des Biomolécules Max Mousseron, Université Montpellier - CNRS, Montpellier, France
| | - Irina Vetter
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
- School of Pharmacy, The University of Queensland, Brisbane, Australia
| | - Gerald W. Zamponi
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Alberta Children’s Hospital Research Institute, The University of Calgary, Calgary, Canada
| | - Glenn F. King
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Paul F. Alewood
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Richard J. Lewis
- IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
- * E-mail:
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Fernandes LS, Dos Santos NAG, Emerick GL, Santos ACD. L- and T-type calcium channel blockers protect against the inhibitory effects of mipafox on neurite outgrowth and plasticity-related proteins in SH-SY5Y cells. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2017; 80:1086-1097. [PMID: 28862523 DOI: 10.1080/15287394.2017.1357359] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Some organophosphorus compounds (OP), including the pesticide mipafox, produce late onset distal axonal degeneration, known as organophosphorus-induced delayed neuropathy (OPIDN). The underlying mechanism involves irreversible inhibition of neuropathy target esterase (NTE) activity, elevated intracellular calcium levels, increased activity of calcium-activated proteases and impaired neuritogenesis. Voltage-gated calcium channels (VGCC) appear to play a role in several neurologic disorders, including OPIDN. Therefore, this study aimed to examine and compare the neuroprotective effects of T-type (amiloride) and L-type (nimodipine) VGCC blockers induced by the inhibitory actions of mipafox on neurite outgrowth and axonal proteins of retinoic-acid-stimulated SH-SY5Y human neuroblastoma cells, a neuronal model widely employed to determine the neurotoxicity attributed to OP. Both nimodipine and amiloride significantly blocked augmentation of intracellular calcium levels and activity of calpains, as well as decreased neurite length, number of differentiated cells, and lowered concentrations of growth-associated protein 43 (GAP-43) and synapsin induced by mipafox. Only nimodipine inhibited reduction of synaptophysin levels produced by mipafox. These findings demonstrate a role for calcium and VGCC in the impairment of neuronal plasticity mediated by mipafox. Data also demonstrated the neuroprotective potential of T-type and L-type VGCC blockers to inhibit OP-mediated actions, which may be beneficial to counteract cases of pesticide poisoning.
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Affiliation(s)
- Laís Silva Fernandes
- a Departamento de Análises Clínicas , Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - FCFRP - USP , Ribeirão Preto , SP , Brazil
| | - Neife Aparecida G Dos Santos
- a Departamento de Análises Clínicas , Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - FCFRP - USP , Ribeirão Preto , SP , Brazil
| | - Guilherme Luz Emerick
- b Instituto de Ciências da Saúde, Universidade Federal de Mato Grosso - ICS/UFMT/CUS , Sinop , MT , Brazil
| | - Antonio Cardozo Dos Santos
- a Departamento de Análises Clínicas , Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - FCFRP - USP , Ribeirão Preto , SP , Brazil
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Coccini T, Caloni F, De Simone U. Human neuronal cell based assay: A new in vitro model for toxicity evaluation of ciguatoxin. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 52:200-213. [PMID: 28437641 DOI: 10.1016/j.etap.2017.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 03/31/2017] [Accepted: 04/02/2017] [Indexed: 06/07/2023]
Abstract
Ciguatoxins (CTXs) are emerging marine neurotoxins representing the main cause of ciguatera fish poisoning, an intoxication syndrome which configures a health emergency and constitutes an evolving issue constantly changing due to new vectors and derivatives of CTXs, as well as their presence in new non-endemic areas. The study applied the neuroblastoma cell model of human origin (SH-SY5Y) to evaluate species-specific mechanistic information on CTX toxicity. Metabolic functionality, cell morphology, cytosolic Ca2+i responses, neuronal cell growth and proliferation were assessed after short- (4-24h) and long-term exposure (10days) to P-CTX-3C. In SH-SY5Y, P-CTX-3C displayed a powerful cytotoxicity requiring the presence of both Veratridine and Ouabain. SH-SY5Y were very sensitive to Ouabain: 10 and 0.25nM appeared the optimal concentrations, for short- and long-term toxicity studies, respectively, to be used in co-incubation with Veratridine (25μM), simulating the physiological and pathological endogenous Ouabain levels in humans. P-CTX-3C cytotoxic effect, on human neurons co-incubated with OV (Ouabain+Veratridine) mix, was expressed starting from 100pM after short- and 25pM after long-term exposure. Notably, P-CTX-3C alone at 25nM induced cytotoxicity after 24h and prolonged exposure. This human brain-derived cell line appears a suitable cell-based-model to evaluate cytotoxicity of CTX present in marine food contaminated at low toxic levels and to characterize the toxicological profile of other/new congeners.
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Affiliation(s)
- Teresa Coccini
- Laboratory of Clinical and Experimental Toxicology, Poison Control Centre, Toxicology Unit, Maugeri Clinical Scientific Institutes S.p.A.-BS, IRCCS Pavia, Pavia Italy.
| | - Francesca Caloni
- Department of Veterinary Medicine (DIMEVET), Università degli Studi di Milano, Milano, Italy
| | - Uliana De Simone
- Laboratory of Clinical and Experimental Toxicology, Poison Control Centre, Toxicology Unit, Maugeri Clinical Scientific Institutes S.p.A.-BS, IRCCS Pavia, Pavia Italy
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Gervois P, Wolfs E, Dillen Y, Hilkens P, Ratajczak J, Driesen R, Vangansewinkel T, Bronckaers A, Brône B, Struys T, Lambrichts I. Paracrine Maturation and Migration of SH-SY5Y Cells by Dental Pulp Stem Cells. J Dent Res 2017; 96:654-662. [DOI: 10.1177/0022034517690491] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Neurological disorders are characterized by neurodegeneration and/or loss of neuronal function, which cannot be adequately repaired by the host. Therefore, there is need for novel treatment options such as cell-based therapies that aim to salvage or reconstitute the lost tissue or that stimulate host repair. The present study aimed to evaluate the paracrine effects of human dental pulp stem cells (hDPSCs) on the migration and neural maturation of human SH-SY5Y neuroblastoma cells. The hDPSC secretome had a significant chemoattractive effect on SH-SY5Y cells as shown by a transwell assay. To evaluate neural maturation, SH-SY5Y cells were first induced toward neuronal cells, after which they were exposed to the hDPSC secretome. In addition, SH-SY5Y cells subjected to the hDPSC secretome showed increased neuritogenesis compared with nonexposed cells. Maturated cells were shown to increase immune reactivity for neuronal markers compared with controls. Ultrastructurally, retinoic acid (RA) signaling and subsequent exposure to the hDPSC secretome induced a gradual rise in metabolic activity and neuronal features such as multivesicular bodies and cytoskeletal elements associated with cellular communication. In addition, electrophysiological recordings of differentiating cells demonstrated a transition toward a neuronal electrophysiological profile based on the maximum tetrodotoxin (TTX)–sensitive, Na+ current. Moreover, conditioned medium (CM)–hDPSC–maturated SH-SY5Y cells developed distinct features including, Cd2+-sensitive currents, which suggests that CM-hDPSC–maturated SH-SY5Y acquired voltage-gated Ca2+ channels. The results reported in this study demonstrate the potential of hDPSCs to support differentiation and recruitment of cells with neuronal precursor characteristics in a paracrine manner. Moreover, this in vitro experimental design showed that the widely used SH-SY5Y cell line can improve and simplify the preclinical in vitro research on the molecular mechanisms of stem cell–mediated neuronal regeneration.
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Affiliation(s)
- P. Gervois
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - E. Wolfs
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Y. Dillen
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - P. Hilkens
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - J. Ratajczak
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - R.B. Driesen
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - T. Vangansewinkel
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - A. Bronckaers
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - B. Brône
- Group of Physiology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - T. Struys
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - I. Lambrichts
- Morphology Research Group, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
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Azimi I, Flanagan JU, Stevenson RJ, Inserra M, Vetter I, Monteith GR, Denny WA. Evaluation of known and novel inhibitors of Orai1-mediated store operated Ca 2+ entry in MDA-MB-231 breast cancer cells using a Fluorescence Imaging Plate Reader assay. Bioorg Med Chem 2016; 25:440-449. [PMID: 27856238 DOI: 10.1016/j.bmc.2016.11.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 11/01/2016] [Accepted: 11/03/2016] [Indexed: 12/20/2022]
Abstract
The Orai1 Ca2+ permeable ion channel is an important component of store operated Ca2+ entry (SOCE) in cells. It's over-expression in basal molecular subtype breast cancers has been linked with poor prognosis, making it a potential target for drug development. We pharmacologically characterised a number of reported inhibitors of SOCE in MDA-MB-231 breast cancer cells using a convenient Fluorescence Imaging Plate Reader (FLIPR) assay, and show that the rank order of their potencies in this assay is the same as those reported in a wide range of published assays. The assay was also used in a screening project seeking novel inhibitors. Following a broad literature survey of classes of calcium channel inhibitors we used simplified ligand structures to query the ZINC on-line database, and following two iterations of refinement selected a novel Orai1-selective dichlorophenyltriazole hit compound. Analogues of this were synthesized and evaluated in the FLIPR assay to develop structure-activity relationships (SAR) for the three domains of the hit; triazole (head), dichlorophenyl (body) and substituted phenyl (tail). For this series, the results suggested the need for a lipophilic tail domain and an out-of-plane twist between the body and tail domains.
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Affiliation(s)
- Iman Azimi
- The School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia; Mater Research Institute, The University of Queensland, Brisbane, Queensland, Australia; Translational Research Institute, Brisbane, Queensland, Australia
| | - Jack U Flanagan
- Auckland Cancer Society Research Centre, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Ralph J Stevenson
- Auckland Cancer Society Research Centre, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Marco Inserra
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia; School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia
| | - Irina Vetter
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia; School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia
| | - Gregory R Monteith
- The School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia; Mater Research Institute, The University of Queensland, Brisbane, Queensland, Australia; Translational Research Institute, Brisbane, Queensland, Australia
| | - William A Denny
- Auckland Cancer Society Research Centre, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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Touchard A, Brust A, Cardoso FC, Chin YKY, Herzig V, Jin AH, Dejean A, Alewood PF, King GF, Orivel J, Escoubas P. Isolation and characterization of a structurally unique β-hairpin venom peptide from the predatory ant Anochetus emarginatus. Biochim Biophys Acta Gen Subj 2016; 1860:2553-2562. [PMID: 27474999 DOI: 10.1016/j.bbagen.2016.07.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 06/24/2016] [Accepted: 07/26/2016] [Indexed: 12/18/2022]
Abstract
BACKGROUND Most ant venoms consist predominantly of small linear peptides, although some contain disulfide-linked peptides as minor components. However, in striking contrast to other ant species, some Anochetus venoms are composed primarily of disulfide-rich peptides. In this study, we investigated the venom of the ant Anochetus emarginatus with the aim of exploring these novel disulfide-rich peptides. METHODS The venom peptidome was initially investigated using a combination of reversed-phase HPLC and mass spectrometry, then the amino acid sequences of the major peptides were determined using a combination of Edman degradation and de novo MS/MS sequencing. We focused on one of these peptides, U1-PONTX-Ae1a (Ae1a), because of its novel sequence, which we predicted would form a novel 3D fold. Ae1a was chemically synthesized using Fmoc chemistry and its 3D structure was elucidated using NMR spectroscopy. The peptide was then tested for insecticidal activity and its effect on a range of human ion channels. RESULTS Seven peptides named poneritoxins (PONTXs) were isolated and sequenced. The three-dimensional structure of synthetic Ae1a revealed a novel, compact scaffold in which a C-terminal β-hairpin is connected to the N-terminal region via two disulfide bonds. Synthetic Ae1a reversibly paralyzed blowflies and inhibited human L-type voltage-gated calcium channels (CaV1). CONCLUSIONS Poneritoxins from Anochetus emarginatus venom are a novel class of toxins that are structurally unique among animal venoms. GENERAL SIGNIFICANCE This study demonstrates that Anochetus ant venoms are a rich source of novel ion channel modulating peptides, some of which might be useful leads for the development of biopesticides.
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Affiliation(s)
- Axel Touchard
- CNRS, UMR Ecologie des forêts de Guyane (AgroParisTech, CIRAD, CNRS, INRA, Université de Guyane, Université des Antilles), Campus Agronomique, BP 316, 97379 Kourou, France.
| | - Andreas Brust
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Fernanda Caldas Cardoso
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Yanni K-Y Chin
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Volker Herzig
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Ai-Hua Jin
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Alain Dejean
- CNRS, UMR Ecologie des forêts de Guyane (AgroParisTech, CIRAD, CNRS, INRA, Université de Guyane, Université des Antilles), Campus Agronomique, BP 316, 97379 Kourou, France; CNRS, UMR 5245, Laboratoire Écologie Fonctionnelle et Environnement, 118 route de Narbonne, 31062 Toulouse, France; Université de Toulouse, UPS, INP, Ecolab, Toulouse, France
| | - Paul F Alewood
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Glenn F King
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Jérôme Orivel
- CNRS, UMR Ecologie des forêts de Guyane (AgroParisTech, CIRAD, CNRS, INRA, Université de Guyane, Université des Antilles), Campus Agronomique, BP 316, 97379 Kourou, France
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Lajarín-Cuesta R, Nanclares C, Arranz-Tagarro JA, González-Lafuente L, Arribas RL, Araujo de Brito M, Gandía L, de Los Ríos C. Gramine Derivatives Targeting Ca(2+) Channels and Ser/Thr Phosphatases: A New Dual Strategy for the Treatment of Neurodegenerative Diseases. J Med Chem 2016; 59:6265-80. [PMID: 27280380 DOI: 10.1021/acs.jmedchem.6b00478] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We describe the synthesis of gramine derivatives and their pharmacological evaluation as multipotent drugs for the treatment of Alzheimer's disease. An innovative multitarget approach is presented, targeting both voltage-gated Ca(2+) channels, classically studied for neurodegenerative diseases, and Ser/Thr phosphatases, which have been marginally aimed, even despite their key role in protein τ dephosphorylation. Twenty-five compounds were synthesized, and mostly their neuroprotective profile exceeded that offered by the head compound gramine. In general, these compounds reduced the entry of Ca(2+) through VGCC, as measured by Fluo-4/AM and patch clamp techniques, and protected in Ca(2+) overload-induced models of neurotoxicity, like glutamate or veratridine exposures. Furthermore, we hypothesize that these compounds decrease τ hyperphosphorylation based on the maintenance of the Ser/Thr phosphatase activity and their neuroprotection against the damage caused by okadaic acid. Hence, we propose this multitarget approach as a new and promising strategy for the treatment of neurodegenerative diseases.
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Affiliation(s)
- Rocío Lajarín-Cuesta
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Carmen Nanclares
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Juan-Alberto Arranz-Tagarro
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Laura González-Lafuente
- Servicio de Farmacología Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa , C/Diego de León, 62, 28006 Madrid, Spain
| | - Raquel L Arribas
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Monique Araujo de Brito
- Programa de Pós Graduação em Ciências Aplicadas a Produtos Para a Saúde, Faculdade de Farmácia, Universidade Federal Fluminense , Niterói, Rio de Janeiro, Brasil
| | - Luis Gandía
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Cristóbal de Los Ríos
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain.,Servicio de Farmacología Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa , C/Diego de León, 62, 28006 Madrid, Spain
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37
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Buchanan PJ, McCloskey KD. Ca V channels and cancer: canonical functions indicate benefits of repurposed drugs as cancer therapeutics. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2016; 45:621-633. [PMID: 27342111 PMCID: PMC5045480 DOI: 10.1007/s00249-016-1144-z] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 05/17/2016] [Accepted: 05/23/2016] [Indexed: 01/19/2023]
Abstract
The importance of ion channels in the hallmarks of many cancers is increasingly recognised. This article reviews current knowledge of the expression of members of the voltage-gated calcium channel family (CaV) in cancer at the gene and protein level and discusses their potential functional roles. The ten members of the CaV channel family are classified according to expression of their pore-forming α-subunit; moreover, co-expression of accessory α2δ, β and γ confers a spectrum of biophysical characteristics including voltage dependence of activation and inactivation, current amplitude and activation/inactivation kinetics. CaV channels have traditionally been studied in excitable cells including neurones, smooth muscle, skeletal muscle and cardiac cells, and drugs targeting the channels are used in the treatment of hypertension and epilepsy. There is emerging evidence that several CaV channels are differentially expressed in cancer cells compared to their normal counterparts. Interestingly, a number of CaV channels also have non-canonical functions and are involved in transcriptional regulation of the expression of other proteins including potassium channels. Pharmacological studies show that CaV canonical function contributes to the fundamental biology of proliferation, cell-cycle progression and apoptosis. This raises the intriguing possibility that calcium channel blockers, approved for the treatment of other conditions, could be repurposed to treat particular cancers. Further research will reveal the full extent of both the canonical and non-canonical functions of CaV channels in cancer and whether calcium channel blockers are beneficial in cancer treatment.
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Affiliation(s)
- Paul J Buchanan
- Centre for Cancer Research and Cell Biology, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, 97 Lisburn Road, Belfast, Northern Ireland, BT9 7AE, UK.,National Institute of Cellular Biotechnology, School of Nursing and Human Science, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Karen D McCloskey
- Centre for Cancer Research and Cell Biology, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, 97 Lisburn Road, Belfast, Northern Ireland, BT9 7AE, UK.
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Yin K, Baillie GJ, Vetter I. Neuronal cell lines as model dorsal root ganglion neurons: A transcriptomic comparison. Mol Pain 2016; 12:1744806916646111. [PMID: 27130590 PMCID: PMC4956150 DOI: 10.1177/1744806916646111] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 02/24/2016] [Accepted: 03/16/2016] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Dorsal root ganglion neuron-derived immortal cell lines including ND7/23 and F-11 cells have been used extensively as in vitro model systems of native peripheral sensory neurons. However, while it is clear that some sensory neuron-specific receptors and ion channels are present in these cell lines, a systematic comparison of the molecular targets expressed by these cell lines with those expressed in intact peripheral neurons is lacking. RESULTS In this study, we examined the expression of RNA transcripts in the human neuroblastoma-derived cell line, SH-SY5Y, and two dorsal root ganglion hybridoma cell lines, F-11 and ND7/23, using Illumina next-generation sequencing, and compared the results with native whole murine dorsal root ganglions. The gene expression profiles of these three cell lines did not resemble any specific defined dorsal root ganglion subclass. The cell lines lacked many markers for nociceptive sensory neurons, such as the Transient receptor potential V1 gene, but expressed markers for both myelinated and unmyelinated neurons. Global gene ontology analysis on whole dorsal root ganglions and cell lines showed similar enrichment of biological process terms across all samples. CONCLUSIONS This paper provides insights into the receptor repertoire expressed in common dorsal root ganglion neuron-derived cell lines compared with whole murine dorsal root ganglions, and illustrates the limits and potentials of these cell lines as tools for neuropharmacological exploration.
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Affiliation(s)
- Kathleen Yin
- Centre for Pain Research, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia Pharmacy Australia Centre of Excellence, University of Queensland, Queensland, Australia
| | - Gregory J Baillie
- Centre for Pain Research, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia
| | - Irina Vetter
- Centre for Pain Research, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia Pharmacy Australia Centre of Excellence, University of Queensland, Queensland, Australia
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Wen X, Xu S, Zhang Q, Li X, Liang H, Yang C, Wang H, Liu H. Inhibitory gene expression of the Cav3.1 T-type calcium channel to improve neuronal injury induced by lidocaine hydrochloride. Eur J Pharmacol 2016; 775:43-9. [PMID: 26852957 DOI: 10.1016/j.ejphar.2016.02.019] [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: 10/07/2015] [Revised: 02/01/2016] [Accepted: 02/03/2016] [Indexed: 10/22/2022]
Abstract
Cav3.1 is a low-voltage-activated (LVA) calcium channel that plays a key role in regulating intracellular calcium ion levels. In this study, we observed the effects of lidocaine hydrochloride on the pshRNA-CACNA1G-SH-SY5Y cells that silenced Cav3.1 mRNA by RNA interference, and investigated the roles of p38 MAPK in these effects. We constructed the pNC-puro-CACNA1G-SH-SY5Y cells and pshRNA-CACNA1G -SH-SY5Y cells by the RNA interference. All the cells were cultured with or without 10mM lidocaine hydrochloride for 24 h. The cell morphology, cell viability, Cav3.1 and p38 protein expression, cell apoptosis rate and intracellular calcium ion concentration were detected. We found that all cells treated with 10mM lidocaine hydrochloride for 24 h showed cellular rounding, axonal regression, and cellular floating. Compared with the cells in SH-SY5Y+Lido group and NC+Lido group, those in the RNAi+Lido group showed similar changes, but of smaller magnitude. Additionally, following lidocaine hydrochloride all cells displayed increased Cav3.1 and p38 MAPK protein, apoptosis rate, and intracellular calcium ion levels; however,these changes in the RNAi+Lido group were less pronounced than in the SH-SY5Y+Lido and NC+Lido groups. The cell viability decreased following lidocaine hydrochloride treatment, but viability of the cells in the RNAi+Lido group was higher than in the SH-SY5Y+Lido and NC+Lido groups. The results showed that Cav3.1 may be involved in neuronal injury induced by lidocaine hydrochloride and that p38 MAPK phosphorylation was reduced upon Cav3.1 gene silencing.
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Affiliation(s)
- Xianjie Wen
- Department of Anesthesiology, First People's Hospital of Foshan & Foshan Hospital of Sun Yat-sen University, Foshan 528000, Guangdong Province, China
| | - Shiyuan Xu
- Department of Anesthesiology, Zhujiang Hospital of Southern Medical University, Guangzhou 510282, Guangdong Province, China.
| | - Qingguo Zhang
- Department of Anesthesiology, Zhujiang Hospital of Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Xiaohong Li
- Department of Pain Clinic, First Affiliated Hospital of Jinan University, Guangzhou 510630, Guangdong Province, China
| | - Hua Liang
- Department of Anesthesiology, First People's Hospital of Foshan & Foshan Hospital of Sun Yat-sen University, Foshan 528000, Guangdong Province, China
| | - Chenxiang Yang
- Department of Anesthesiology, First People's Hospital of Foshan & Foshan Hospital of Sun Yat-sen University, Foshan 528000, Guangdong Province, China
| | - Hanbing Wang
- Department of Anesthesiology, First People's Hospital of Foshan & Foshan Hospital of Sun Yat-sen University, Foshan 528000, Guangdong Province, China
| | - Hongzhen Liu
- Department of Anesthesiology, First People's Hospital of Foshan & Foshan Hospital of Sun Yat-sen University, Foshan 528000, Guangdong Province, China
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40
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Zhang Z, Chen R, An W, Wang C, Liao G, Dong X, Bi A, Yin Z, Luo L. A novel acetylcholinesterase inhibitor and calcium channel blocker SCR-1693 improves Aβ25-35-impaired mouse cognitive function. Psychopharmacology (Berl) 2016; 233:599-613. [PMID: 26554390 DOI: 10.1007/s00213-015-4133-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 10/23/2015] [Indexed: 12/27/2022]
Abstract
RATIONALE The mechanism involved in AD is complex, which has prompted to develop compounds that could simultaneously interact with several potential targets. Here, we report a new synthesized compound SCR-1693 which is designed to target both AChE and calcium channels that are potential for AD therapy. OBJECTIVES We investigated the effects of SCR-1693 on AChE and calcium channels, the effects of neuroprotection and anti-amnesia in icv-Aβ25-35-injected mice, and the potential mechanisms. METHODS AChE activity assay, intracellular Ca(2+) content and calcium currents measurement, and Aβ25-35-induced cellular death determine were performed for validation of designed targets and neuroprotection of SCR-1693. Mice were orally administrated with SCR-1693 once daily after an Aβ25-35 injection. The Morris water maze and Y-maze test, and hippocampal protein detection were conducted on days 5-10, day 11, and day 8. The pyramidal neuron number, hippocampal AChE activity, and synaptic transmission were measured on day 12. RESULTS SCR-1693 acted as a selective, reversible, and noncompetitive inhibitor of AChE, and a nonselective voltage-gated calcium channel blocker. SCR-1693 also inhibited the increase of AChE activity in the mouse hippocampus. SCR-1693 was more effective than donepezil and memantine in preventing Aβ25-35-induced long-term and short-term memory impairment, maintaining the basal transmission of Schaffer collateral-CA1 synapses, and sustaining LTP in mouse hippocampus. SCR-1693 attenuated Aβ25-35-induced death of SH-SY5Y cell and the loss of hippocampal pyramidal neurons, and regulated Aβ25-35-induced signal cascade in neurons. CONCLUSIONS All these findings indicated that SCR-1693, as a double-target-direction agent, is a considerable candidate for AD therapy.
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Affiliation(s)
- Zhengping Zhang
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210093, People's Republic of China
- Jiangsu Simovay Pharmaceutical Co., Ltd., Nanjing, 210042, People's Republic of China
| | - Rong Chen
- Jiangsu Simovay Pharmaceutical Co., Ltd., Nanjing, 210042, People's Republic of China
| | - Wenji An
- Jiangsu Simovay Pharmaceutical Co., Ltd., Nanjing, 210042, People's Republic of China
| | - Chunmei Wang
- Jiangsu Simovay Pharmaceutical Co., Ltd., Nanjing, 210042, People's Republic of China
| | - Gaoyong Liao
- Jiangsu Simovay Pharmaceutical Co., Ltd., Nanjing, 210042, People's Republic of China
| | - Xiaoliang Dong
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Aijing Bi
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Zhimin Yin
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, 210046, People's Republic of China.
| | - Lan Luo
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210093, People's Republic of China.
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41
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Bioactive Mimetics of Conotoxins and other Venom Peptides. Toxins (Basel) 2015; 7:4175-98. [PMID: 26501323 PMCID: PMC4626728 DOI: 10.3390/toxins7104175] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 10/08/2015] [Indexed: 11/17/2022] Open
Abstract
Ziconotide (Prialt®), a synthetic version of the peptide ω-conotoxin MVIIA found in the venom of a fish-hunting marine cone snail Conus magnus, is one of very few drugs effective in the treatment of intractable chronic pain. However, its intrathecal mode of delivery and narrow therapeutic window cause complications for patients. This review will summarize progress in the development of small molecule, non-peptidic mimics of Conotoxins and a small number of other venom peptides. This will include a description of how some of the initially designed mimics have been modified to improve their drug-like properties.
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42
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Himaya SWA, Jin AH, Dutertre S, Giacomotto J, Mohialdeen H, Vetter I, Alewood PF, Lewis RJ. Comparative Venomics Reveals the Complex Prey Capture Strategy of the Piscivorous Cone Snail Conus catus. J Proteome Res 2015; 14:4372-81. [PMID: 26322961 DOI: 10.1021/acs.jproteome.5b00630] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Venomous marine cone snails produce a unique and remarkably diverse range of venom peptides (conotoxins and conopeptides) that have proven to be invaluable as pharmacological probes and leads to new therapies. Conus catus is a hook-and-line fish hunter from clade I, with ∼20 conotoxins identified, including the analgesic ω-conotoxin CVID (AM336). The current study unravels the venom composition of C. catus with tandem mass spectrometry and 454 sequencing data. From the venom gland transcriptome, 104 precursors were recovered from 11 superfamilies, with superfamily A (especially κA-) conotoxins dominating (77%) their venom. Proteomic analysis confirmed that κA-conotoxins dominated the predation-evoked milked venom of each of six C. catus analyzed and revealed remarkable intraspecific variation in both the intensity and type of conotoxins. High-throughput FLIPR assays revealed that the predation-evoked venom contained a range of conotoxins targeting the nAChR, Cav, and Nav ion channels, consistent with α- and ω-conotoxins being used for predation by C. catus. However, the κA-conotoxins did not act at these targets but induced potent and rapid immobilization followed by bursts of activity and finally paralysis when injected intramuscularly in zebrafish. Our venomics approach revealed the complexity of the envenomation strategy used by C. catus, which contains a mix of both excitatory and inhibitory venom peptides.
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Affiliation(s)
- S W A Himaya
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia
| | - Ai-Hua Jin
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia
| | - Sébastien Dutertre
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia.,Institut des Biomolécules Max Mousseron, UMR 5247, Université Montpellier-CNRS , Place Eugène Bataillon, Montpellier Cedex 5 34095, France
| | - Jean Giacomotto
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia
| | - Hoshyar Mohialdeen
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia
| | - Irina Vetter
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia
| | - Paul F Alewood
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia
| | - Richard J Lewis
- Institute for Molecular Bioscience, The University of Queensland , Brisbane, 4072 Queensland, Australia
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43
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Cardoso FC, Dekan Z, Rosengren KJ, Erickson A, Vetter I, Deuis JR, Herzig V, Alewood PF, King GF, Lewis RJ. Identification and Characterization of ProTx-III [μ-TRTX-Tp1a], a New Voltage-Gated Sodium Channel Inhibitor from Venom of the Tarantula Thrixopelma pruriens. Mol Pharmacol 2015; 88:291-303. [PMID: 25979003 DOI: 10.1124/mol.115.098178] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 05/15/2015] [Indexed: 01/26/2023] Open
Abstract
Spider venoms are a rich source of ion channel modulators with therapeutic potential. Given the analgesic potential of subtype-selective inhibitors of voltage-gated sodium (NaV) channels, we screened spider venoms for inhibitors of human NaV1.7 (hNaV1.7) using a high-throughput fluorescent assay. Here, we describe the discovery of a novel NaV1.7 inhibitor, μ-TRTX-Tp1a (Tp1a), isolated from the venom of the Peruvian green-velvet tarantula Thrixopelma pruriens. Recombinant and synthetic forms of this 33-residue peptide preferentially inhibited hNaV1.7 > hNaV1.6 > hNaV1.2 > hNaV1.1 > hNaV1.3 channels in fluorescent assays. NaV1.7 inhibition was diminished (IC50 11.5 nM) and the association rate decreased for the C-terminal acid form of Tp1a compared with the native amidated form (IC50 2.1 nM), suggesting that the peptide C terminus contributes to its interaction with hNaV1.7. Tp1a had no effect on human voltage-gated calcium channels or nicotinic acetylcholine receptors at 5 μM. Unlike most spider toxins that modulate NaV channels, Tp1a inhibited hNaV1.7 without significantly altering the voltage dependence of activation or inactivation. Tp1a proved to be analgesic by reversing spontaneous pain induced in mice by intraplantar injection in OD1, a scorpion toxin that potentiates hNaV1.7. The structure of Tp1a as determined using NMR spectroscopy revealed a classic inhibitor cystine knot (ICK) motif. The molecular surface of Tp1a presents a hydrophobic patch surrounded by positively charged residues, with subtle differences from other ICK spider toxins that might contribute to its different pharmacological profile. Tp1a may help guide the development of more selective and potent hNaV1.7 inhibitors for treatment of chronic pain.
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Affiliation(s)
- Fernanda C Cardoso
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Zoltan Dekan
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - K Johan Rosengren
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Andelain Erickson
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Irina Vetter
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Jennifer R Deuis
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Volker Herzig
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Paul F Alewood
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Glenn F King
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
| | - Richard J Lewis
- Institute for Molecular Bioscience (F.C.C., Z.D., I.V., J.R.D., V.H., P.F.A., G.F.K., R.J.L.), School of Biomedical Sciences (K.J.R.), and School of Chemistry and Molecular Biosciences (A.E.), The University of Queensland, Brisbane, Queensland, Australia
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44
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Gleeson EC, Graham JE, Spiller S, Vetter I, Lewis RJ, Duggan PJ, Tuck KL. Inhibition of N-type calcium channels by fluorophenoxyanilide derivatives. Mar Drugs 2015; 13:2030-45. [PMID: 25871286 PMCID: PMC4413198 DOI: 10.3390/md13042030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 03/18/2015] [Accepted: 03/26/2015] [Indexed: 12/26/2022] Open
Abstract
A set of fluorophenoxyanilides, designed to be simplified analogues of previously reported ω-conotoxin GVIA mimetics, were prepared and tested for N-type calcium channel inhibition in a SH-SY5Y neuroblastoma FLIPR assay. N-type or Cav2.2 channel is a validated target for the treatment of refractory chronic pain. Despite being significantly less complex than the originally designed mimetics, up to a seven-fold improvement in activity was observed.
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MESH Headings
- Analgesics, Non-Narcotic/chemical synthesis
- Analgesics, Non-Narcotic/chemistry
- Analgesics, Non-Narcotic/metabolism
- Analgesics, Non-Narcotic/pharmacology
- Anilides/chemical synthesis
- Anilides/chemistry
- Anilides/metabolism
- Anilides/pharmacology
- Binding, Competitive
- Calcium Channel Blockers/chemical synthesis
- Calcium Channel Blockers/chemistry
- Calcium Channel Blockers/metabolism
- Calcium Channel Blockers/pharmacology
- Calcium Channels, N-Type/chemistry
- Calcium Channels, N-Type/metabolism
- Calcium Signaling/drug effects
- Cell Line, Tumor
- Drug Design
- Fluorobenzenes/chemical synthesis
- Fluorobenzenes/chemistry
- Fluorobenzenes/metabolism
- Fluorobenzenes/pharmacology
- High-Throughput Screening Assays
- Humans
- Molecular Structure
- Molecular Targeted Therapy
- Nerve Tissue Proteins/antagonists & inhibitors
- Nerve Tissue Proteins/metabolism
- Neuralgia/drug therapy
- Neuralgia/metabolism
- Neurons/drug effects
- Neurons/metabolism
- Neurotoxins/chemistry
- Pain, Intractable/drug therapy
- Pain, Intractable/metabolism
- Structure-Activity Relationship
- omega-Conotoxin GVIA/chemistry
- omega-Conotoxin GVIA/metabolism
- omega-Conotoxin GVIA/pharmacology
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Affiliation(s)
- Ellen C Gleeson
- School of Chemistry, Monash University, Clayton VIC 3800, Australia.
- CSIRO Manufacturing Flagship, Clayton South, VIC 3169, Australia.
| | - Janease E Graham
- School of Chemistry, Monash University, Clayton VIC 3800, Australia.
- CSIRO Manufacturing Flagship, Clayton South, VIC 3169, Australia.
| | - Sandro Spiller
- School of Chemistry, Monash University, Clayton VIC 3800, Australia.
| | - Irina Vetter
- Institute for Molecular Bioscience, The University of Queensland, St Lucia QLD 4072, Australia.
| | - Richard J Lewis
- Institute for Molecular Bioscience, The University of Queensland, St Lucia QLD 4072, Australia.
| | - Peter J Duggan
- CSIRO Manufacturing Flagship, Clayton South, VIC 3169, Australia.
- School of Chemical and Physical Sciences, Flinders University, Adelaide SA 5042, Australia.
| | - Kellie L Tuck
- School of Chemistry, Monash University, Clayton VIC 3800, Australia.
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Klint JK, Smith JJ, Vetter I, Rupasinghe DB, Er SY, Senff S, Herzig V, Mobli M, Lewis RJ, Bosmans F, King GF. Seven novel modulators of the analgesic target NaV 1.7 uncovered using a high-throughput venom-based discovery approach. Br J Pharmacol 2015; 172:2445-58. [PMID: 25754331 DOI: 10.1111/bph.13081] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 11/08/2014] [Accepted: 12/08/2014] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND AND PURPOSE Chronic pain is a serious worldwide health issue, with current analgesics having limited efficacy and dose-limiting side effects. Humans with loss-of-function mutations in the voltage-gated sodium channel NaV 1.7 (hNaV 1.7) are indifferent to pain, making hNaV 1.7 a promising target for analgesic development. Since spider venoms are replete with NaV channel modulators, we examined their potential as a source of hNaV 1.7 inhibitors. EXPERIMENTAL APPROACH We developed a high-throughput fluorescent-based assay to screen spider venoms against hNaV 1.7 and isolate 'hit' peptides. To examine the binding site of these peptides, we constructed a panel of chimeric channels in which the S3b-S4 paddle motif from each voltage sensor domain of hNaV 1.7 was transplanted into the homotetrameric KV 2.1 channel. KEY RESULTS We screened 205 spider venoms and found that 40% contain at least one inhibitor of hNaV 1.7. By deconvoluting 'hit' venoms, we discovered seven novel members of the NaSpTx family 1. One of these peptides, Hd1a (peptide μ-TRTX-Hd1a from venom of the spider Haplopelma doriae), inhibited hNaV 1.7 with a high level of selectivity over all other subtypes, except hNaV 1.1. We showed that Hd1a is a gating modifier that inhibits hNaV 1.7 by interacting with the S3b-S4 paddle motif in channel domain II. The structure of Hd1a, determined using heteronuclear NMR, contains an inhibitor cystine knot motif that is likely to confer high levels of chemical, thermal and biological stability. CONCLUSION AND IMPLICATIONS Our data indicate that spider venoms are a rich natural source of hNaV 1.7 inhibitors that might be useful leads for the development of novel analgesics.
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Affiliation(s)
- Julie K Klint
- Centre for Pain Research, Institute for Molecular Bioscience, St. Lucia, Qld, Australia
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Tenti G, Parada E, León R, Egea J, Martínez-Revelles S, Briones AM, Sridharan V, López MG, Ramos MT, Menéndez JC. New 5-Unsubstituted Dihydropyridines with Improved CaV1.3 Selectivity as Potential Neuroprotective Agents against Ischemic Injury. J Med Chem 2014; 57:4313-23. [DOI: 10.1021/jm500263v] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Giammarco Tenti
- Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
| | - Esther Parada
- Instituto Teófilo Hernando y Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
| | - Rafael León
- Instituto Teófilo Hernando y Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
- Instituto de Investigación Sanitaria, Servicio de Farmacología Clínica, Hospital Universitario de la Princesa, 28006 Madrid, Spain
| | - Javier Egea
- Instituto Teófilo Hernando y Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
| | - Sonia Martínez-Revelles
- Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Instituto de Investigación del Hospital Universitario La Paz (IdiPAZ), 28029 Madrid, Spain
| | - Ana María Briones
- Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Instituto de Investigación del Hospital Universitario La Paz (IdiPAZ), 28029 Madrid, Spain
| | - Vellaisamy Sridharan
- Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, Tamil Nadu, India
| | - Manuela G. López
- Instituto Teófilo Hernando y Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
- Instituto de Investigación Sanitaria, Servicio de Farmacología Clínica, Hospital Universitario de la Princesa, 28006 Madrid, Spain
- Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Instituto de Investigación del Hospital Universitario La Paz (IdiPAZ), 28029 Madrid, Spain
| | - María Teresa Ramos
- Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
| | - J. Carlos Menéndez
- Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
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Dutertre S, Jin AH, Vetter I, Hamilton B, Sunagar K, Lavergne V, Dutertre V, Fry BG, Antunes A, Venter DJ, Alewood PF, Lewis RJ. Evolution of separate predation- and defence-evoked venoms in carnivorous cone snails. Nat Commun 2014; 5:3521. [PMID: 24662800 PMCID: PMC3973120 DOI: 10.1038/ncomms4521] [Citation(s) in RCA: 219] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 02/26/2014] [Indexed: 01/06/2023] Open
Abstract
Venomous animals are thought to inject the same combination of toxins for both predation and defence, presumably exploiting conserved target pharmacology across prey and predators. Remarkably, cone snails can rapidly switch between distinct venoms in response to predatory or defensive stimuli. Here, we show that the defence-evoked venom of Conus geographus contains high levels of paralytic toxins that potently block neuromuscular receptors, consistent with its lethal effects on humans. In contrast, C. geographus predation-evoked venom contains prey-specific toxins mostly inactive at human targets. Predation- and defence-evoked venoms originate from the distal and proximal regions of the venom duct, respectively, explaining how different stimuli can generate two distinct venoms. A specialized defensive envenomation strategy is widely evolved across worm, mollusk and fish-hunting cone snails. We propose that defensive toxins, originally evolved in ancestral worm-hunting cone snails to protect against cephalopod and fish predation, have been repurposed in predatory venoms to facilitate diversification to fish and mollusk diets.
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Affiliation(s)
- Sébastien Dutertre
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
- Institut des Biomolécules Max Mousseron, UMR 5247, Université Montpellier 2—CNRS, Place Eugène Bataillon, Montpellier Cedex 5 34095, France
| | - Ai-Hua Jin
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Irina Vetter
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
- School of Pharmacy, The University of Queensland, Brisbane, 4102 Queensland, Australia
| | - Brett Hamilton
- Pathology Department, and Mater Research Institute, Mater Health Services, South Brisbane, 4101 Queensland, Australia
| | - Kartik Sunagar
- CIMAR/CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 177, Porto 4050-123, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, Porto 4169-007, Portugal
| | - Vincent Lavergne
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Valentin Dutertre
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Bryan G. Fry
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
- Venom Evolution Lab, School of Biological Sciences, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Agostinho Antunes
- CIMAR/CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 177, Porto 4050-123, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, Porto 4169-007, Portugal
| | - Deon J. Venter
- Pathology Department, and Mater Research Institute, Mater Health Services, South Brisbane, 4101 Queensland, Australia
- Department of Medicine, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Paul F. Alewood
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
| | - Richard J. Lewis
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia
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Taveira M, Sousa C, Valentão P, Ferreres F, Teixeira JP, Andrade PB. Neuroprotective effect of steroidal alkaloids on glutamate-induced toxicity by preserving mitochondrial membrane potential and reducing oxidative stress. J Steroid Biochem Mol Biol 2014; 140:106-15. [PMID: 24373792 DOI: 10.1016/j.jsbmb.2013.12.013] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Revised: 11/28/2013] [Accepted: 12/16/2013] [Indexed: 01/31/2023]
Abstract
Several evidences suggest that enhanced oxidative stress is involved in the pathogenesis and/or progression of several neurodegenerative diseases. The aim of this study was to investigate for the first time whether both extracts from tomato plant (Lycopersicon esculentum Mill.) leaves and their isolated steroidal alkaloids (tomatine and tomatidine) afford neuroprotective effect against glutamate-induced toxicity in SH-SY5Y neuroblastoma cells and to elucidate the mechanisms underlying this protection. Steroidal alkaloids from tomato are well known for their cholinesterases' inhibitory capacity and the results showed that both purified extracts and isolated compounds, at non-toxic concentrations for gastric (AGS), intestinal (Caco-2) and neuronal (SH-SY5Y) cells, have the capacity to preserve mitochondria membrane potential and to decrease reactive oxygen species levels of SH-SY5Y glutamate-insulted cells. Moreover, the use of specific antagonists of cholinergic receptors allowed observing that tomatine and tomatidine can interact with nicotinic receptors, specifically with the α7 type. No effect on muscarinic receptors was noticed. In addition to the selective cholinesterases' inhibition revealed by the compounds/extracts, these results provide novel and important insights into their neuroprotective mechanism. This work also demystifies the applicability of these compounds in therapeutics, by demonstrating that their toxicity was overestimated for long time.
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Affiliation(s)
- Marcos Taveira
- REQUIMTE/Laboratório de Farmacognosia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, n°. 228, 4050-313 Porto, Portugal
| | - Carla Sousa
- REQUIMTE/Laboratório de Farmacognosia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, n°. 228, 4050-313 Porto, Portugal
| | - Patrícia Valentão
- REQUIMTE/Laboratório de Farmacognosia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, n°. 228, 4050-313 Porto, Portugal
| | - Federico Ferreres
- CEBAS (CSIC) Research Group on Quality, Safety and Bioactivity of Plant Foods, Department of Food Science and Technology, P.O. Box 164, 30100 Campus University Espinardo, Murcia, Spain
| | - João P Teixeira
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal
| | - Paula B Andrade
- REQUIMTE/Laboratório de Farmacognosia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, n°. 228, 4050-313 Porto, Portugal.
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Zhang S, Kwan P, Baum L. The potential role of CAMSAP1L1 in symptomatic epilepsy. Neurosci Lett 2013; 556:146-51. [PMID: 24148305 DOI: 10.1016/j.neulet.2013.10.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 10/02/2013] [Accepted: 10/10/2013] [Indexed: 11/18/2022]
Abstract
In a recent genome-wide association study (GWAS) of symptomatic epilepsy in the Chinese population, the most significant single nucleotide polymorphism (SNP) allele was rs2292096 [G] (P=1.0×10(-8), odds ratio [OR]=0.63), in the CAMSAP1L1 gene (also known as CAMSAP2). Here, we report that rs2292096 genotypes tended to associate with expression of CAMSAP1L1 RNA in the temporal lobe (p=0.054) and hippocampus (p=0.20) of epilepsy surgery patients, with expression tending to increase with the G allele. CAMSAP1L1 and β-tubulin double immunofluorescence exhibited partial overlap. CAMSAP1L1 siRNA transfection of human SH-SY5Y neuroblastoma cells treated with or without retinoic acid reduced the CAMSAP1L1 protein level nearly 60% and stimulated neurite outgrowth, as measured by total length, number of processes and number of branches. Therefore, the rs2292096 G allele of CAMSAP1L1, which was associated with reduced risk of symptomatic epilepsy, tended to associate with increased expression of CAMSAP1L1, which represses neurite outgrowth. Greater neurite growth in response to brain insults might increase formation of ectopic neural circuits and thus the risk of epileptogenesis.
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Affiliation(s)
- Shuai Zhang
- School of Pharmacy, The Chinese University of Hong Kong, Shatin, Hong Kong, China
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