1
|
Ribeiro Liberato H, Bezerra Maciel J, Wlisses Da Silva A, Freitas da Silva AE, San De Oliveira Brito L, Silva J, Sydney Henrique da Silva F, Bezerra AS, Kuerislene Amâncio Ferreira M, Machado Marinho M, Silva Marinho G, Deusdênia Loiola Pessoa O, Goberlânio De Barros Silva P, Noronha Coelho-de-Souza A, Florindo Guedes I, Ferreira de Castro Gomes A, Eire Silva Alencar De Menezes J, Silva Santos H. Tropane Alkaloid Isolated from Erythroxylum bezerrae Exhibits Neuropharmacological Potential in an Adult Zebrafish (Danio rerio) Model. Chem Biodivers 2024:e202400786. [PMID: 38777789 DOI: 10.1002/cbdv.202400786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 05/17/2024] [Accepted: 05/22/2024] [Indexed: 05/25/2024]
Abstract
This study carried out to investigate the anti-inflammatory and antinociceptive effect of tropane alkaloid (EB7) isolated from E. bezerrae. It evaluated the toxicity and possible involvement of ion channels in the antinociceptive effect of EB7, as well as its anti-inflammatory effect in adult zebrafish (Zfa). Docking studies with EB7 and COX-1 and 2 were also performed. The tested doses of EB7 (4, 20 and 40 mg/kg) did not show any toxic effect on Zfa during the 96h of analysis (LD50>40 mg/kg). They did not produce any alteration in the locomotor behavior of the animals. Furthermore, EB7 showed promising pharmacological effects as it prevented the nociceptive behavior induced by hypertonic saline, capsaicin, formalin and acid saline. EB7 had its analgesic effect blocked by amiloride involving the neuromodulation of ASICs in Zfa. In evaluating the anti-inflammatory activity, the edema induced by κ-carrageenan 3.5 % was reduced by the dose of 40 mg/kg of EB7 observed after the fourth hour of analysis, indicating an effect similar to that of ibuprofen. Molecular docking results indicated that EB7 exhibited better affinity energy when compared to ibuprofen control against the two evaluated targets binding at different sites in the cocrystallized COX-1 and 2 inhibitors.
Collapse
Affiliation(s)
| | - Jéssica Bezerra Maciel
- Programa de PósGraduação em Ciências Naturais, Universidade Estadual do Ceará, Fortaleza, Ceará, Brazil
| | | | | | - Luana San De Oliveira Brito
- Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Campus do Pici s/n, Fortaleza, Ceará, Brazil
| | - Jacilene Silva
- Programa de PósGraduação em Ciências Naturais, Universidade Estadual do Ceará, Fortaleza, Ceará, Brazil
| | | | - Arnaldo S Bezerra
- Programa de PósGraduação em Ciências Fisiológicas, Universidade Estadual do Ceará
| | | | - Marcia Machado Marinho
- Universidade Estadual do Vale do Acaraú, Centro de Ciências Exatas e Tecnologia, Sobral, Ceará, Brasil
| | - Gabrielle Silva Marinho
- Programa de PósGraduação em Ciências Naturais, Universidade Estadual do Ceará, Fortaleza, Ceará, Brazil
| | - Otília Deusdênia Loiola Pessoa
- Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Campus do Pici s/n, Fortaleza, Ceará, Brazil
| | | | | | | | | | | | - Hélcio Silva Santos
- Programa de PósGraduação em Ciências Naturais, Universidade Estadual do Ceará, Fortaleza, Ceará, Brazil
- Universidade Estadual do Vale do Acaraú, Centro de Ciências Exatas e Tecnologia, Sobral, Ceará, Brasil
| |
Collapse
|
2
|
Adolph C, Cheung CY, McNeil MB, Jowsey WJ, Williams ZC, Hards K, Harold LK, Aboelela A, Bujaroski RS, Buckley BJ, Tyndall JDA, Li Z, Langer JD, Preiss L, Meier T, Steyn AJC, Rhee KY, Berney M, Kelso MJ, Cook GM. A dual-targeting succinate dehydrogenase and F 1F o-ATP synthase inhibitor rapidly sterilizes replicating and non-replicating Mycobacterium tuberculosis. Cell Chem Biol 2024; 31:683-698.e7. [PMID: 38151019 DOI: 10.1016/j.chembiol.2023.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/13/2023] [Accepted: 12/04/2023] [Indexed: 12/29/2023]
Abstract
Mycobacterial bioenergetics is a validated target space for antitubercular drug development. Here, we identify BB2-50F, a 6-substituted 5-(N,N-hexamethylene)amiloride derivative as a potent, multi-targeting bioenergetic inhibitor of Mycobacterium tuberculosis. We show that BB2-50F rapidly sterilizes both replicating and non-replicating cultures of M. tuberculosis and synergizes with several tuberculosis drugs. Target identification experiments, supported by docking studies, showed that BB2-50F targets the membrane-embedded c-ring of the F1Fo-ATP synthase and the catalytic subunit (substrate-binding site) of succinate dehydrogenase. Biochemical assays and metabolomic profiling showed that BB2-50F inhibits succinate oxidation, decreases the activity of the tricarboxylic acid (TCA) cycle, and results in succinate secretion from M. tuberculosis. Moreover, we show that the lethality of BB2-50F under aerobic conditions involves the accumulation of reactive oxygen species. Overall, this study identifies BB2-50F as an effective inhibitor of M. tuberculosis and highlights that targeting multiple components of the mycobacterial respiratory chain can produce fast-acting antimicrobials.
Collapse
Affiliation(s)
- Cara Adolph
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Private Bag 92019, Auckland 1042, New Zealand
| | - Chen-Yi Cheung
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand
| | - Matthew B McNeil
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Private Bag 92019, Auckland 1042, New Zealand
| | - William J Jowsey
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Private Bag 92019, Auckland 1042, New Zealand
| | - Zoe C Williams
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand
| | - Kiel Hards
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand
| | - Liam K Harold
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand
| | - Ashraf Aboelela
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia; Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Richard S Bujaroski
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia; Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Benjamin J Buckley
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia; Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Joel D A Tyndall
- School of Pharmacy, University of Otago, Dunedin 9054, New Zealand
| | - Zhengqiu Li
- School of Pharmacy, Jinan University, Guangzhou, China
| | - Julian D Langer
- Proteomics, Max Planck Institute of Biophysics, Max-von-Laue-Strasse 3, 60438 Frankfurt am Main, Germany
| | - Laura Preiss
- Structural Biology, Max Planck Institute of Biophysics, Max-von-Laue-Strasse 3, 60438 Frankfurt am Main, Germany
| | - Thomas Meier
- Department of Life Sciences, Imperial College London, Exhibition Road, London SW7 2AZ, UK; Private University in the Principality of Liechtenstein, Triesen, Liechtenstein
| | - Adrie J C Steyn
- Africa Health Research Institute, University of KwaZulu Natal, Durban, KwaZulu, Natal, South Africa; Department of Microbiology, Centers for AIDs Research and Free Radical Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Kyu Y Rhee
- Department of Microbiology and Immunology, Weill Cornell Medicine, Cornell University, Ithaca, NY 14853, USA; Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, Cornell University, Ithaca, NY 14853, USA
| | - Michael Berney
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, New York, NY, USA
| | - Michael J Kelso
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia; Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Gregory M Cook
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Private Bag 92019, Auckland 1042, New Zealand.
| |
Collapse
|
3
|
Yuan Z, Miao L, Zhang S, Li H, Li G, Zhang G. The role of acid-sensing ion channels in monosodium urate-induced gouty pain in mice. Pflugers Arch 2024; 476:101-110. [PMID: 37770586 DOI: 10.1007/s00424-023-02862-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 06/25/2023] [Accepted: 09/19/2023] [Indexed: 09/30/2023]
Abstract
Acid-sensing ion channels (ASICs) in dorsal root ganglion (DRG) neurons play an important role in inflammatory pain. The objective of this study is to observe the regulatory role of ASICs in monosodium urate (MSU) crystal-induced gout pain and explore the basis for ASICs in DRG neurons as a target for gout pain treatment. The gout arthritis model was induced by injecting MSU crystals into the ankle joint of mice. The circumference of the ankle joint was used to evaluate the degree of swelling; the von Frey filaments were used to determine the withdrawal threshold of the paw. ASIC currents and action potentials (APs) were recorded by patch clamp technique in DRG neurons. The results displayed that injecting MSU crystals caused ankle edema and mechanical hyperalgesia of the paw, which was relieved after amiloride treatment. The ASIC currents in DRG neurons were increased to a peak on the second day after injecting MSU crystals, which were decreased after amiloride treatment. MSU treatment increased the current density of ASICs in different diameter DRG cells. MSU treatment does not change the characteristics of AP. The results suggest that ASICs in DRG neurons participate in MSU crystal-induced gout pain.
Collapse
Affiliation(s)
- Ziqi Yuan
- Department of Clinical Pharmacy, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing, 210009, China
| | - Lurong Miao
- Department of Clinical Pharmacy, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing, 210009, China
| | - Shijia Zhang
- School of Pharmacy, Xuzhou Medical University, Xuzhou, 221100, China
| | - Hanhan Li
- Department of Clinical Pharmacy, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing, 210009, China
| | - Guang Li
- Key Laboratory of Medical Electrophysiology, Ministry of Education, Institute of Cardiovascular Research of Southwest Medical University, Luzhou, 6463000, China
| | - Guangqin Zhang
- Department of Clinical Pharmacy, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing, 210009, China.
| |
Collapse
|
4
|
Tkachenko Y, Khmyz V, Buta A, Isaev D, Maximyuk O, Krishtal O. Acid-sensing ion channel blocker diminazene facilitates proton-induced excitation of afferent nerves in a similar manner that Na +/H + exchanger blockers do. Front Cell Neurosci 2023; 17:1131661. [PMID: 37502464 PMCID: PMC10368877 DOI: 10.3389/fncel.2023.1131661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 06/26/2023] [Indexed: 07/29/2023] Open
Abstract
Tissue acidification causes sustained activation of primary nociceptors, which causes pain. In mammals, acid-sensing ion channels (ASICs) are the primary acid sensors; however, Na+/H+ exchangers (NHEs) and TRPV1 receptors also contribute to tissue acidification sensing. ASICs, NHEs, and TRPV1 receptors are found to be expressed in nociceptive nerve fibers. ASIC inhibitors reduce peripheral acid-induced hyperalgesia and suppress inflammatory pain. Also, it was shown that pharmacological inhibition of NHE1 promotes nociceptive behavior in acute pain models, whereas inhibition of TRPV1 receptors gives relief. The murine skin-nerve preparation was used in this study to assess the activation of native polymodal nociceptors by mild acidification (pH 6.1). We have found that diminazene, a well-known antagonist of ASICs did not suppress pH-induced activation of CMH-fibers at concentrations as high as 25 μM. Moreover, at 100 μM, it induces the potentiation of the fibers' response to acidic pH. At the same time, this concentration virtually completely inhibited ASIC currents in mouse dorsal root ganglia (DRG) neurons (IC50 = 17.0 ± 4.5 μM). Non-selective ASICs and NHEs inhibitor EIPA (5-(N-ethyl-N-isopropyl)amiloride) at 10 μM, as well as selective NHE1 inhibitor zoniporide at 0.5 μM induced qualitatively the same effects as 100 μM of diminazene. Our results indicate that excitation of afferent nerve terminals induced by mild acidification occurs mainly due to the NHE1, rather than acid-sensing ion channels. At high concentrations, diminazene acts as a weak blocker of the NHE. It lacks chemical similarity with amiloride, EIPA, and zoniporide, so it may represent a novel structural motif for the development of NHE antagonists. However, the effect of diminazene on the acid-induced excitation of primary nociceptors remains enigmatic and requires additional investigations.
Collapse
|
5
|
Cao Y, Redd MA, Fang C, Mizikovsky D, Li X, Macdonald PS, King GF, Palpant NJ. New Drug Targets and Preclinical Modelling Recommendations for Treating Acute Myocardial Infarction. Heart Lung Circ 2023:S1443-9506(23)00139-7. [PMID: 37230806 DOI: 10.1016/j.hlc.2022.12.015] [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: 09/05/2022] [Revised: 11/28/2022] [Accepted: 12/15/2022] [Indexed: 05/27/2023]
Abstract
Acute myocardial infarction (AMI) is the leading cause of morbidity and mortality worldwide and the primary underlying risk factor for heart failure. Despite decades of research and clinical trials, there are no drugs currently available to prevent organ damage from acute ischaemic injuries of the heart. In order to address the increasing global burden of heart failure, drug, gene, and cell-based regeneration technologies are advancing into clinical testing. In this review we highlight the burden of disease associated with AMI and the therapeutic landscape based on market analyses. New studies revealing the role of acid-sensitive cardiac ion channels and other proton-gated ion channels in cardiac ischaemia are providing renewed interest in pre- and post-conditioning agents with novel mechanisms of action that may also have implications for gene- and cell-based therapeutics. Furthermore, we present guidelines that couple new cell technologies and data resources with traditional animal modelling pipelines to help de-risk drug candidates aimed at treating AMI. We propose that improved preclinical pipelines and increased investment in drug target identification for AMI is critical to stem the increasing global health burden of heart failure.
Collapse
Affiliation(s)
- Yuanzhao Cao
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Qld, Australia
| | - Meredith A Redd
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Qld, Australia
| | - Chen Fang
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Qld, Australia
| | - Dalia Mizikovsky
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Qld, Australia
| | - Xichun Li
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Qld, Australia
| | - Peter S Macdonald
- Cardiopulmonary Transplant Unit, St Vincent's Hospital, Sydney, NSW, Australia
| | - Glenn F King
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Qld, Australia; Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, Qld, Australia
| | - Nathan J Palpant
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Qld, Australia.
| |
Collapse
|
6
|
Sun HW, Chu XP, Simon RP, Xiong ZG, Leng TD. Inhibition of Acid-Sensing Ion Channels by KB-R7943, a Reverse Na+/Ca2+ Exchanger Inhibitor. Biomolecules 2023; 13:biom13030507. [PMID: 36979442 PMCID: PMC10046550 DOI: 10.3390/biom13030507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 02/27/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023] Open
Abstract
KB-R7943, an isothiourea derivative, is widely used as a pharmacological inhibitor of reverse sodium–calcium exchanger (NCX). It has been shown to have neuroprotective and analgesic effects in animal models; however, the detailed molecular mechanisms remain elusive. In the current study, we investigated whether KB-R7943 modulates acid-sensing ion channels (ASICs), a group of proton-gated cation channels implicated in the pathophysiology of various neurological disorders, using the whole-cell patch clamp techniques. Our data show that KB-R7943 irreversibly inhibits homomeric ASIC1a channels heterologously expressed in Chinese Hamster Ovary (CHO) cells in a use- and concentration-dependent manner. It also reversibly inhibits homomeric ASIC2a and ASIC3 channels in CHO cells. Both the transient and sustained current components of ASIC3 are inhibited. Furthermore, KB-R7943 inhibits ASICs in primary cultured peripheral and central neurons. It inhibits the ASIC-like currents in mouse dorsal root ganglion (DRG) neurons and the ASIC1a-like currents in mouse cortical neurons. The inhibition of the ASIC1a-like current is use-dependent and unrelated to its effect on NCX since neither of the other two well-characterized NCX inhibitors, including SEA0400 and SN-6, shows an effect on ASIC. Our data also suggest that the isothiourea group, which is lacking in other structurally related analogs that do not affect ASIC1a-like current, may serve as a critical functional group. In summary, we characterize KB-R7943 as a new ASIC inhibitor. It provides a novel pharmacological tool for the investigation of the functions of ASICs and could serve as a lead compound for developing small-molecule drugs for treating ASIC-related disorders.
Collapse
Affiliation(s)
- Hua-Wei Sun
- Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA 30310, USA
| | - Xiang-Ping Chu
- Department of Biomedical Sciences, University of Missouri-Kansas City School of Medicine, Kansas City, MO 64108, USA
| | - Roger P. Simon
- Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA 30310, USA
| | - Zhi-Gang Xiong
- Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA 30310, USA
| | - Tian-Dong Leng
- Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA 30310, USA
- Correspondence:
| |
Collapse
|
7
|
Zhigulin AS, Tikhonov DB, Barygin OI. Mechanisms of acid-sensing ion channels inhibition by nafamostat, sepimostat and diminazene. Eur J Pharmacol 2022; 938:175394. [PMID: 36403685 DOI: 10.1016/j.ejphar.2022.175394] [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: 07/21/2022] [Revised: 10/27/2022] [Accepted: 11/14/2022] [Indexed: 11/18/2022]
Abstract
Acid-sensing ion channels (ASICs) are blocked by many cationic compounds. Mechanisms of action, which may include pore block, modulation of activation and desensitization, need systematic analysis to allow predictable design of new potent and selective drugs. In this work, we studied the action of the serine protease inhibitors nafamostat, sepimostat, gabexate and camostat, on native ASICs in rat giant striatal interneurons and recombinant ASIC1a and ASIC2a channels, and compared it to that of well-known small molecule ASIC blocker diminazene. All these compounds have positively charged amidine and/or guanidine groups in their structure. Nafamostat, sepimostat and diminazene inhibited pH 6.5-induced currents in rat striatal interneurons at -80 mV holding voltage with IC50 values of 0.78 ± 0.12 μM, 2.4 ± 0.3 μM and 0.40 ± 0.09 μM, respectively, whereas camostat and gabexate were practically ineffective. The inhibition by nafamostat, sepimostat and diminazene was voltage-dependent evidencing binding in the channel pore. They were not trapped in the closed channels, suggesting "foot-in-the-door" mechanism of action. The inhibitory activity of nafamostat, sepimostat and diminazene was similar in experiments on native ASICs and recombinant ASIC1a channels, while all of them were drastically less active against ASIC2a channels. According to our molecular modeling, three active compounds bind in the channel pore between Glu 433 and Ala 444 in a similar way. In view of the relative safety of nafamostat for clinical use in humans, it can be considered as a potential candidate for the treatment of pathophysiological conditions linked to ASICs disfunction, including inflammatory pain and ischemic stroke.
Collapse
Affiliation(s)
- Arseniy S Zhigulin
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia
| | - Denis B Tikhonov
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia
| | - Oleg I Barygin
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry RAS, Saint-Petersburg, Russia.
| |
Collapse
|
8
|
Sudarikova AV, Bychkov ML, Kulbatskii DS, Chubinskiy-Nadezhdin VI, Shlepova OV, Shulepko MA, Koshelev SG, Kirpichnikov MP, Lyukmanova EN. Mambalgin-2 Inhibits Lung Adenocarcinoma Growth and Migration by Selective Interaction With ASIC1/α-ENaC/γ-ENaC Heterotrimer. Front Oncol 2022; 12:904742. [PMID: 35837090 PMCID: PMC9273970 DOI: 10.3389/fonc.2022.904742] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 05/24/2022] [Indexed: 12/21/2022] Open
Abstract
Lung cancer is one of the most common cancer types in the world. Despite existing treatment strategies, overall patient survival remains low and new targeted therapies are required. Acidification of the tumor microenvironment drives the growth and metastasis of many cancers. Acid sensors such as acid-sensing ion channels (ASICs) may become promising targets for lung cancer therapy. Previously, we showed that inhibition of the ASIC1 channels by a recombinant analogue of mambalgin-2 from Dendroaspis polylepis controls oncogenic processes in leukemia, glioma, and melanoma cells. Here, we studied the effects and molecular targets of mambalgin-2 in lung adenocarcinoma A549 and Lewis cells, lung transformed WI-38 fibroblasts, and lung normal HLF fibroblasts. We found that mambalgin-2 inhibits the growth and migration of A549, metastatic Lewis P29 cells, and WI-38 cells, but not of normal fibroblasts. A549, Lewis, and WI-38 cells expressed different ASIC and ENaC subunits, while normal fibroblasts did not at all. Mambalgin-2 induced G2/M cell cycle arrest and apoptosis in lung adenocarcinoma cells. In line, acidification-evoked inward currents were observed only in A549 and WI-38 cells. Gene knockdown showed that the anti-proliferative and anti-migratory activity of mambalgin-2 is dependent on the expression of ASIC1a, α-ENaC, and γ-ENaC. Using affinity extraction and immunoprecipitation, mambalgin-2 targeting of ASIC1a/α-ENaC/γ-ENaC heteromeric channels in A549 cells was shown. Electrophysiology studies in Xenopus oocytes revealed that mambalgin-2 inhibits the ASIC1a/α-ENaC/γ-ENaC channels with higher efficacy than the ASIC1a channels, pointing on the heteromeric channels as a primary target of the toxin in cancer cells. Finally, bioinformatics analysis showed that the increased expression of ASIC1 and γ-ENaC correlates with a worse survival prognosis for patients with lung adenocarcinoma. Thus, the ASIC1a/α-ENaC/γ-ENaC heterotrimer can be considered a marker of cell oncogenicity and its targeting is promising for the design of new selective cancer therapeutics.
Collapse
Affiliation(s)
- Anastasia V. Sudarikova
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Group of Ionic Mechanisms of Cell Signaling, Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
| | - Maxim L. Bychkov
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Dmitrii S. Kulbatskii
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Vladislav I. Chubinskiy-Nadezhdin
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Group of Ionic Mechanisms of Cell Signaling, Department of Intracellular Signaling and Transport, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
| | - Olga V. Shlepova
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Phystech School of Biological and Medical Physics, Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Russia
| | - Mikhail A. Shulepko
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Sergey G. Koshelev
- Laboratory of Neuroreceptors and Neuroregulators, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Mikhail P. Kirpichnikov
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Interdisciplinary Scientific and Educational School of Moscow University «Molecular Technologies of the Living Systems and Synthetic Biology», Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Ekaterina N. Lyukmanova
- Laboratory of Bioengineering of Neuromodulators and Neuroreceptors, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Phystech School of Biological and Medical Physics, Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Russia
- Interdisciplinary Scientific and Educational School of Moscow University «Molecular Technologies of the Living Systems and Synthetic Biology», Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
- *Correspondence: Ekaterina N. Lyukmanova,
| |
Collapse
|
9
|
Davis H, Paterson DJ, Herring N. Post-Ganglionic Sympathetic Neurons can Directly Sense Raised Extracellular Na + via SCN7a/Na x. Front Physiol 2022; 13:931094. [PMID: 35784866 PMCID: PMC9247455 DOI: 10.3389/fphys.2022.931094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 05/24/2022] [Indexed: 11/13/2022] Open
Abstract
The relationship between dietary NaCl intake and high blood pressure is well-established, and occurs primarily through activation of the sympathetic nervous system. Nax, a Na+-sensitive Na+ channel, plays a pivotal role in driving sympathetic excitability, which is thought to originate from central regions controlling neural outflow. We investigated whether post-ganglionic sympathetic neurons from different ganglia innervating cardiac and vasculature tissue can also directly sense extracellular Na+. Using whole-cell patch clamp recordings we demonstrate that sympathetic neurons from three sympathetic ganglia (superior cervical, stellate and superior mesenteric/coeliac) respond to elevated extracellular NaCl concentration. In sympathetic stellate ganglia neurons, we established that the effect of NaCl was dose-dependent and independent of osmolarity, Cl- and membrane Ca2+ flux, and critically dependent on extracellular Na+ concentration. We show that Nax is expressed in sympathetic stellate ganglia neurons at a transcript and protein level using single-cell RNA-sequencing and immunohistochemistry respectively. Additionally, the response to NaCl was prevented by siRNA-mediated knockdown of Nax, but not by inhibition of other membrane Na+ pathways. Together, these results demonstrate that post-ganglionic sympathetic neurons are direct sensors of extracellular Na+ via Nax, which could contribute to sympathetic driven hypertension.
Collapse
Affiliation(s)
- Harvey Davis
- Burdon Sanderson Cardiac Science Centre, Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
- Wellcome Trust OXION Initiative in Ion Channels and Disease, Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
| | - David J Paterson
- Burdon Sanderson Cardiac Science Centre, Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
- Wellcome Trust OXION Initiative in Ion Channels and Disease, Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
| | - Neil Herring
- Burdon Sanderson Cardiac Science Centre, Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
- Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, Oxford, United Kingdom
| |
Collapse
|
10
|
Kanda S, Moulton E, Butchbach MER. Effects of inhibitors of SLC9A-type sodium-protein exchangers on Survival Motor Neuron 2 ( SMN2) mRNA splicing and expression. Mol Pharmacol 2022; 102:92-105. [PMID: 35667685 PMCID: PMC9341265 DOI: 10.1124/molpharm.122.000529] [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: 03/15/2022] [Accepted: 05/09/2022] [Indexed: 11/22/2022] Open
Abstract
Spinal muscular atrophy (SMA) is an autosomal recessive, pediatric-onset disorder caused by the loss of spinal motor neurons thereby leading to muscle atrophy. SMA is caused by the loss of or mutations in the survival motor neuron 1 (SMN1) gene. SMN1 is duplicated in humans to give rise to the paralogous SMN2 gene. This paralog is nearly identical except for a cytosine to thymine (C-to-T) transition within an exonic splicing enhancer (ESE) element within exon 7. As a result, the majority of SMN2 transcripts lack exon 7 (SMNΔ7) which produces a truncated and unstable SMN protein. Since SMN2 copy number is inversely related to disease severity, it is a well-established target for SMA therapeutics development. 5-(N-ethyl-N-isopropyl)amiloride (EIPA), an inhibitor of sodium/proton exchangers (NHEs), has previously been shown to increase exon 7 inclusion and SMN protein levels in SMA cells. In this study, NHE inhibitors were evaluated for their ability to modulate SMN2 expression. EIPA as well as 5-(N,N-hexamethylene)amiloride (HMA) increase exon 7 inclusion in SMN2 splicing reporter lines as well as in SMA fibroblasts. The EIPA-induced exon 7 inclusion occurs via a unique mechanism that does not involve previously identified splicing factors. Transcriptome analysis identified novel targets, including TIA1 and FABP3, for further characterization. EIPA and HMA are more selective at inhibiting the NHE5 isoform, which is expressed in fibroblasts as well as in neuronal cells. These results show that NHE5 inhibition increases SMN2 expression and may be a novel target for therapeutics development. Significance Statement This study demonstrates a molecular mechanism by which inhibitors of the sodium-protein exchanger increase the alternative splicing of SMN2 in spinal muscular atrophy cells. NHE5 selective inhibitors increase the inclusion of full-length SMN2 mRNAs by targeting TIA1 and FABP3 expression, which is distinct from other small molecule regulators of SMN2 alternative splicing. This study provides a novel means to increase full-length SMN2 expression and a novel target for therapeutics development.
Collapse
Affiliation(s)
- Sambee Kanda
- Biological Sciences, University of Delaware, United States
| | - Emily Moulton
- Biomedical Research, Nemours Children's Hospital Delaware, United States
| | | |
Collapse
|
11
|
Ridley J, Manyweathers S, Tang R, Goetze T, Becker N, Rinke-Weiß I, Kirby R, Obergrussberger A, Rogers M. Development of ASIC1a ligand-gated ion channel drug screening assays across multiple automated patch clamp platforms. Front Mol Neurosci 2022; 15:982689. [PMID: 36340694 PMCID: PMC9629855 DOI: 10.3389/fnmol.2022.982689] [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: 06/30/2022] [Accepted: 09/12/2022] [Indexed: 02/05/2023] Open
Abstract
Human acid-sensing ion channels (ASIC) are ligand-gated ionotropic receptors expressed widely in peripheral tissues as well as sensory and central neurons and implicated in detection of inflammation, tissue injury, and hypoxia-induced acidosis. This makes ASIC channels promising targets for drug discovery in oncology, pain and ischemia, and several modulators have progressed into clinical trials. We describe the use of hASIC1a as a case study for the development and validation of low, medium and high throughput automated patch clamp (APC) assays suitable for the screening and mechanistic profiling of new ligands for this important class of ligand-gated ion channel. Initial efforts to expand on previous manual patch work describing an endogenous hASIC1a response in HEK cells were thwarted by low current expression and unusual pharmacology, so subsequent work utilized stable hASIC1a CHO cell lines. Ligand-gated application protocols and screening assays on the Patchliner, QPatch 48, and SyncroPatch 384 were optimized and validated based on pH activation and nM-μM potency of reference antagonists (e.g., Amiloride, Benzamil, Memantine, Mambalgin-3, A-317567, PcTx1). By optimizing single and stacked pipette tip applications available on each APC platform, stable pH-evoked currents during multiple ligand applications enabled cumulative EC50 and IC50 determinations with minimized receptor desensitization. Finally, we successfully demonstrated for the first time on an APC platform the ability to use current clamp to implement the historical technique of input resistance tracking to measure ligand-gated changes in membrane conductance on the Patchliner platform.
Collapse
Affiliation(s)
- John Ridley
- Metrion Biosciences Ltd., Cambridge, United Kingdom
| | | | - Raymond Tang
- Metrion Biosciences Ltd., Cambridge, United Kingdom
| | - Tom Goetze
- Nanion Technologies GmbH, Munich, Germany
| | | | | | - Robert Kirby
- Metrion Biosciences Ltd., Cambridge, United Kingdom
| | | | - Marc Rogers
- Metrion Biosciences Ltd., Cambridge, United Kingdom
- *Correspondence: Marc Rogers,
| |
Collapse
|
12
|
Mango D, Nisticò R. Neurodegenerative Disease: What Potential Therapeutic Role of Acid-Sensing Ion Channels? Front Cell Neurosci 2021; 15:730641. [PMID: 34690702 PMCID: PMC8531221 DOI: 10.3389/fncel.2021.730641] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 09/15/2021] [Indexed: 12/19/2022] Open
Abstract
Acidic pH shift occurs in many physiological neuronal activities such as synaptic transmission and synaptic plasticity but also represents a characteristic feature of many pathological conditions including inflammation and ischemia. Neuroinflammation is a complex process that occurs in various neurodegenerative diseases such as Alzheimer’s disease, Parkinson’s disease, multiple sclerosis, and Huntington’s disease. Acid-sensing ion channels (ASICs) represent a widely expressed pH sensor in the brain that play a key role in neuroinflammation. On this basis, acid-sensing ion channel blockers are able to exert neuroprotective effects in different neurodegenerative diseases. In this review, we discuss the multifaceted roles of ASICs in brain physiology and pathology and highlight ASIC1a as a potential pharmacological target in neurodegenerative diseases.
Collapse
Affiliation(s)
- Dalila Mango
- Laboratory of Pharmacology of Synaptic Plasticity, European Brain Research Institute, Rome, Italy.,School of Pharmacy, University of Rome "Tor Vergata", Rome, Italy
| | - Robert Nisticò
- Laboratory of Pharmacology of Synaptic Plasticity, European Brain Research Institute, Rome, Italy.,School of Pharmacy, University of Rome "Tor Vergata", Rome, Italy
| |
Collapse
|
13
|
Lim J, Tai HH, Liao WH, Chu YC, Hao CM, Huang YC, Lee CH, Lin SS, Hsu S, Chien YC, Lai DM, Chen WS, Chen CC, Wang JL. ASIC1a is required for neuronal activation via low-intensity ultrasound stimulation in mouse brain. eLife 2021; 10:e61660. [PMID: 34569932 PMCID: PMC8510583 DOI: 10.7554/elife.61660] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 09/22/2021] [Indexed: 12/20/2022] Open
Abstract
Accumulating evidence has shown transcranial low-intensity ultrasound can be potentially a non-invasive neural modulation tool to treat brain diseases. However, the underlying mechanism remains elusive and the majority of studies on animal models applying rather high-intensity ultrasound that cannot be safely used in humans. Here, we showed low-intensity ultrasound was able to activate neurons in the mouse brain and repeated ultrasound stimulation resulted in adult neurogenesis in specific brain regions. In vitro calcium imaging studies showed that a specific ultrasound stimulation mode, which combined with both ultrasound-induced pressure and acoustic streaming mechanotransduction, is required to activate cultured cortical neurons. ASIC1a and cytoskeletal proteins were involved in the low-intensity ultrasound-mediated mechanotransduction and cultured neuron activation, which was inhibited by ASIC1a blockade and cytoskeleton-modified agents. In contrast, the inhibition of mechanical-sensitive channels involved in bilayer-model mechanotransduction like Piezo or TRP proteins did not repress the ultrasound-mediated neuronal activation as efficiently. The ASIC1a-mediated ultrasound effects in mouse brain such as immediate response of ERK phosphorylation and DCX marked neurogenesis were statistically significantly compromised by ASIC1a gene deletion. Collated data suggest that ASIC1a is the molecular determinant involved in the mechano-signaling of low-intensity ultrasound that modulates neural activation in mouse brain.
Collapse
Affiliation(s)
- Jormay Lim
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan UniversityTaipeiTaiwan
| | - Hsiao-Hsin Tai
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan UniversityTaipeiTaiwan
| | - Wei-Hao Liao
- Department of Physical Medicine and Rehabilitation, National Taiwan Hospital UniversityTaipeiTaiwan
| | - Ya-Cherng Chu
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan UniversityTaipeiTaiwan
| | - Chen-Ming Hao
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan UniversityTaipeiTaiwan
| | - Yueh-Chun Huang
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan UniversityTaipeiTaiwan
| | - Cheng-Han Lee
- Institute of Biomedical Sciences, Academia SinicaTaipeiTaiwan
| | - Shao-Shien Lin
- Department of Surgery, National Taiwan Hospital UniversityTaipeiTaiwan
| | - Sherry Hsu
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan UniversityTaipeiTaiwan
| | - Ya-Chih Chien
- Institute of Biomedical Sciences, Academia SinicaTaipeiTaiwan
| | - Dar-Ming Lai
- Department of Surgery, National Taiwan Hospital UniversityTaipeiTaiwan
| | - Wen-Shiang Chen
- Department of Physical Medicine and Rehabilitation, National Taiwan Hospital UniversityTaipeiTaiwan
| | - Chih-Cheng Chen
- Institute of Biomedical Sciences, Academia SinicaTaipeiTaiwan
| | - Jaw-Lin Wang
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan UniversityTaipeiTaiwan
| |
Collapse
|
14
|
Zhu Y, Warrenfelt CIC, Flannery JC, Lindgren CA. Extracellular Protons Mediate Presynaptic Homeostatic Potentiation at the Mouse Neuromuscular Junction. Neuroscience 2021; 467:188-200. [PMID: 34215419 DOI: 10.1016/j.neuroscience.2021.01.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 01/22/2021] [Accepted: 01/28/2021] [Indexed: 01/27/2023]
Abstract
At the vertebrate neuromuscular junction (NMJ), presynaptic homeostatic potentiation (PHP) refers to the upregulation of neurotransmitter release via an increase in quantal content (QC) when the postsynaptic nicotinic acetylcholine receptors (nAChRs) are partially blocked. The mechanism of PHP has not been completely worked out. In particular, the identity of the presumed retrograde signal is still a mystery. We investigated the role of acid-sensing ion channels (ASICs) and extracellular protons in mediating PHP at the mouse NMJ. We found that blocking AISCs using benzamil, psalmotoxin-1 (PcTx1), or mambalgin-3 (Mamb3) prevented PHP. Likewise, extracellular acidification from pH 7.4 to 7.2 triggered a significant, reversable increase in QC and this increase could be prevented by PcTx1. Interestingly, an acidic saline (pH 7.2) also precluded the subsequent induction of PHP. Using immunofluorescence we observed ASIC2a and ASIC1 subunits at the NMJ. Our results indicate that protons and ASIC channels are involved in activating PHP at the mouse NMJ. We speculate that the partial blockade of nAChRs leads to a modest decrease in the pH of the synaptic cleft (∼0.2 pH units) and this activates ASIC channels on the presynaptic nerve terminal.
Collapse
Affiliation(s)
- Yiyang Zhu
- Department of Biology, Grinnell College, Grinnell, IA 50112, USA
| | | | - Jill C Flannery
- Department of Biology, Grinnell College, Grinnell, IA 50112, USA
| | - Clark A Lindgren
- Department of Biology, Grinnell College, Grinnell, IA 50112, USA.
| |
Collapse
|
15
|
Xu Y, Chen F. Acid-Sensing Ion Channel-1a in Articular Chondrocytes and Synovial Fibroblasts: A Novel Therapeutic Target for Rheumatoid Arthritis. Front Immunol 2021; 11:580936. [PMID: 33584647 PMCID: PMC7876322 DOI: 10.3389/fimmu.2020.580936] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 12/14/2020] [Indexed: 12/19/2022] Open
Abstract
Acid-sensing ion channel 1a (ASIC1a) is a member of the extracellular H+-activated cation channel family. Emerging evidence has suggested that ASIC1a plays a crucial role in the pathogenesis of rheumatoid arthritis (RA). Specifically, ASIC1a could promote inflammation, synovial hyperplasia, articular cartilage, and bone destruction; these lead to the progression of RA, a chronic autoimmune disease characterized by chronic synovial inflammation and extra-articular lesions. In this review, we provided a brief overview of the molecular properties of ASIC1a, including the basic biological characteristics, tissue and cell distribution, channel blocker, and factors influencing the expression and function, and focused on the potential therapeutic targets of ASIC1a in RA and possible mechanisms of blocking ASIC1a to improve RA symptoms, such as regulation of apoptosis, autophagy, pyroptosis, and necroptosis of articular cartilage, and synovial inflammation and invasion of fibroblast-like cells in synovial tissue.
Collapse
Affiliation(s)
- Yayun Xu
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, China.,The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China.,The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China
| | - Feihu Chen
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, China.,The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China.,The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China
| |
Collapse
|
16
|
Protein Kinase C Regulates ASIC1a Protein Expression and Channel Function via NF-kB Signaling Pathway. Mol Neurobiol 2020; 57:4754-4766. [PMID: 32783140 DOI: 10.1007/s12035-020-02056-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 08/03/2020] [Indexed: 10/23/2022]
Abstract
Tissue acidosis is a common feature in many pathological conditions. Activation of acid-sensing ion channel 1a (ASIC1a) plays a key role in acidosis-mediated neurotoxicity. Protein kinase C (PKC) activity has been proved to be associated with many physiological processes and pathological conditions; however, whether PKC activation regulates ASIC1a protein expression and channel function remains ill defined. In this study, we demonstrated that treatment with phorbol 12-myristate 13-acetate (PMA, a PKC activator) for 6 h significantly increased ASIC1a protein expression and ASIC currents in NS20Y cells, a neuronal cell line, and in primary cultured mouse cortical neurons. In contrast, treatment with Calphostin C (a nonselective PKC inhibitor) for 6 h or longer decreased ASIC1a protein expression and ASIC currents. Similar to Calphostin C, PKC α and βI inhibitor Go6976 exposure also reduced ASIC1a protein expression. The reduction in ASIC1a protein expression by PKC inhibition involves a change in ASIC1a protein degradation, which is mediated by ubiquitin-proteasome system (UPS)-dependent degradation pathway. In addition, we showed that PKC regulation of ASIC1a protein expression involves NF-κB signaling pathway. Consistent with their effects on ASIC1a protein expression and channel function, PKC inhibition protected NS20Y cells against acidosis-induced cytotoxicity, while PKC activation potentiated acidosis-induced cells injury. Together, these results indicate that ASIC1a protein expression and channel function are closely regulated by the activity of protein kinase C and its downstream signaling pathway(s).
Collapse
|
17
|
Mambalgin-2 Induces Cell Cycle Arrest and Apoptosis in Glioma Cells via Interaction with ASIC1a. Cancers (Basel) 2020; 12:cancers12071837. [PMID: 32650495 PMCID: PMC7408772 DOI: 10.3390/cancers12071837] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/27/2020] [Accepted: 07/02/2020] [Indexed: 02/06/2023] Open
Abstract
Gliomas are fast growing and highly invasive brain tumors, characterized by tumor microenvironment acidification that drives glioma cell growth and migration. Channels containing Acid-sensing Ion Channel 1a subunit (ASIC1a) mediate amiloride-sensitive cation influx in late stage glioma cells, but not in normal astrocytes. Thus, selective targeting of ASIC1a can be a perspective strategy for glioma treatment. Here, ASIC1a expression in U251 MG and A172 glioma cells, but not in normal astrocytes, was demonstrated. Recombinant analog of mambalgin-2 from black mamba Dendroaspis polylepis inhibited amiloride-sensitive currents at ASIC1a both in Xenopus laevis oocytes and in U251 MG cells, while its mutants with impaired activity towards this channel did not. Mambalgin-2 inhibited U251 MG and A172 glioma cells growth with EC50 in the nanomolar range without affecting the proliferation of normal astrocytes. Notably, mambalgin-2 mutants did not affect glioma cell proliferation, pointing on ASIC1a as the main molecular target of mambalgin-2 in U251 MG and A172 cells. Mambalgin-2 induced a cell cycle arrest, inhibited Cyclin D1 and cyclin-dependent kinases (CDK) phosphorylation and caused apoptosis in U251 MG and A172 cells. Moreover, mambalgin-2 inhibited the growth of low-passage primary cells from a patient with glioblastoma. Altogether, our data point to mambalgin-2 as a useful hit for the development of new drugs for glioma treatment.
Collapse
|
18
|
Solntseva EI, Bukanova YV, Skrebitsky VG. Effect of Protons on GABA A Receptors in Central Neurons of Various Types. Bull Exp Biol Med 2020; 168:419-422. [PMID: 32146633 DOI: 10.1007/s10517-020-04722-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Indexed: 10/24/2022]
Abstract
Whole-cell patch-clamp technique was employed to record chloride ionic current IGABA evoked by fast (600 msec) application of GABA to hippocampal pyramidal neurons and cerebellar Purkinje cells isolated from rat brain. GABA solution in the application pipette was either neutral (pH 7.4) or acidic (pH 7.0 or 6.0). Application of protons to neurons causes a rapid, reversible, and dose-dependent decrease in the amplitude of IGABA; the effect was more pronounced on hippocampal neurons (carrying both synaptic and extrasynaptic GABAA receptors) than in cerebellar Purkinje cells (predominantly equipped with synaptic GABAA receptors). In hippocampal neurons, pharmacological isolation of extrasynaptic component from total IGABA was performed with GABAA receptor antagonist gabazine (50 nM). The extrasynaptic component of IGABA was stronger blocked by protons than total IGABA. It was concluded that acidic medium produced more potent blocking effect on extrasynaptic GABAA receptors than on synaptic ones.
Collapse
|
19
|
Natale S, Anzilotti S, Petrozziello T, Ciccone R, Serani A, Calabrese L, Severino B, Frecentese F, Secondo A, Pannaccione A, Fiorino F, Cuomo O, Vinciguerra A, D'Esposito L, Sadile AG, Cabib S, Di Renzo G, Annunziato L, Molinaro P. Genetic Up-Regulation or Pharmacological Activation of the Na +/Ca 2+ Exchanger 1 (NCX1) Enhances Hippocampal-Dependent Contextual and Spatial Learning and Memory. Mol Neurobiol 2020; 57:2358-2376. [PMID: 32048166 DOI: 10.1007/s12035-020-01888-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 01/29/2020] [Indexed: 01/23/2023]
Abstract
The Na+/Ca2+ exchanger 1 (NCX1) participates in the maintenance of neuronal Na+ and Ca2+ homeostasis, and it is highly expressed at synapse level of some brain areas involved in learning and memory processes, including the hippocampus, cortex, and amygdala. Furthermore, NCX1 increases Akt1 phosphorylation and enhances glutamate-mediated Ca2+ influx during depolarization in hippocampal and cortical neurons, two processes involved in learning and memory mechanisms. We investigated whether the modulation of NCX1 expression/activity might influence learning and memory processes. To this aim, we used a knock-in mouse overexpressing NCX1 in hippocampal, cortical, and amygdala neurons (ncx1.4over) and a newly synthesized selective NCX1 stimulating compound, named CN-PYB2. Both ncx1.4over and CN-PYB2-treated mice showed an amelioration in spatial learning performance in Barnes maze task, and in context-dependent memory consolidation after trace fear conditioning. On the other hand, these mice showed no improvement in novel object recognition task which is mainly dependent on non-spatial memory and displayed an increase in the active phosphorylated CaMKIIα levels in the hippocampus. Interestingly, both of these mice showed an increased level of context-dependent anxiety.Altogether, these results demonstrate that neuronal NCX1 participates in spatial-dependent hippocampal learning and memory processes.
Collapse
Affiliation(s)
- Silvia Natale
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | | | - Tiziana Petrozziello
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Roselia Ciccone
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Angelo Serani
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Lucrezia Calabrese
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Beatrice Severino
- Department of Pharmacy, "Federico II" University of Naples, 80131, Naples, Italy
| | - Francesco Frecentese
- Department of Pharmacy, "Federico II" University of Naples, 80131, Naples, Italy
| | - Agnese Secondo
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Anna Pannaccione
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Ferdinando Fiorino
- Department of Pharmacy, "Federico II" University of Naples, 80131, Naples, Italy
| | - Ornella Cuomo
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Antonio Vinciguerra
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | - Lucia D'Esposito
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | | | - Simona Cabib
- Department of Psychology and Centro "Daniel Bovet", Sapienza University, 00185, Rome, Italy
| | - Gianfranco Di Renzo
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy
| | | | - Pasquale Molinaro
- Division of Pharmacology, Department of Neuroscience, Reproductive and Odontostomatologic Sciences, School of Medicine, "Federico II" University of Naples, Via Pansini 5, 80131, Naples, Italy.
| |
Collapse
|
20
|
Zhou R, Leng T, Yang T, Chen F, Hu W, Xiong ZG. β-Estradiol Protects Against Acidosis-Mediated and Ischemic Neuronal Injury by Promoting ASIC1a (Acid-Sensing Ion Channel 1a) Protein Degradation. Stroke 2019; 50:2902-2911. [PMID: 31412757 PMCID: PMC6756944 DOI: 10.1161/strokeaha.119.025940] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Background and Purpose- Sex differences in the incidence and outcome of stroke have been well documented. The severity of stroke in women is, in general, significantly lower than that in men, which is mediated, at least in part, by the protective effects of β-estradiol. However, the detailed mechanisms underlying the neuroprotection by β-estradiol are still elusive. Recent studies have demonstrated that activation of ASIC1a (acid-sensing ion channel 1a) by tissue acidosis, a common feature of brain ischemia, plays an important role in ischemic brain injury. In the present study, we assessed the effects of β-estradiol on acidosis-mediated and ischemic neuronal injury both in vitro and in vivo and explored the involvement of ASIC1a and underlying mechanism. Methods- Cultured neurons and NS20Y cells were subjected to acidosis-mediated injury in vitro. Cell viability and cytotoxicity were measured by methylthiazolyldiphenyl-tetrazolium bromide and lactate dehydrogenase assays, respectively. Transient (60 minutes) focal ischemia in mice was induced by suture occlusion of the middle cerebral artery in vivo. ASIC currents were recorded using whole-cell patch-clamp technique while intracellular Ca2+ concentration was measured with fluorescence imaging using Fura-2. ASIC1a expression was detected by Western blotting and quantitative real-time polymerase chain reaction. Results- Treatment of neuronal cells with β-estradiol decreased acidosis-induced cytotoxicity. ASIC currents and acid-induced elevation of intracellular Ca2+ were all attenuated by β-estradiol treatment. In addition, we showed that β-estradiol treatment reduced ASIC1a protein expression, which was mediated by increased protein degradation, and that estrogen receptor α was involved. Finally, we showed that the level of ASIC1a protein expression in brain tissues and the degree of neuroprotection by ASIC1a blockade were lower in female mice, which could be attenuated by ovariectomy. Conclusions- β-estradiol can protect neurons against acidosis-mediated neurotoxicity and ischemic brain injury by suppressing ASIC1a protein expression and channel function. Visual Overview- An online visual overview is available for this article.
Collapse
Affiliation(s)
- Renpeng Zhou
- From the Department of Pharmacology, the Second Hospital of Anhui Medical University, China (R.Z., W.H.)
- Department of Neurobiology, Morehouse School of Medicine, Atlanta (R.Z., T.L., T.Y., Z.X.)
| | - Tiandong Leng
- Department of Neurobiology, Morehouse School of Medicine, Atlanta (R.Z., T.L., T.Y., Z.X.)
| | - Tao Yang
- Department of Neurobiology, Morehouse School of Medicine, Atlanta (R.Z., T.L., T.Y., Z.X.)
| | - Feihu Chen
- Department of Basic and Clinical Pharmacology, School of Pharmacy, Anhui Medical University, China (F.C.)
| | - Wei Hu
- From the Department of Pharmacology, the Second Hospital of Anhui Medical University, China (R.Z., W.H.)
| | - Zhi-Gang Xiong
- Department of Neurobiology, Morehouse School of Medicine, Atlanta (R.Z., T.L., T.Y., Z.X.)
| |
Collapse
|
21
|
Zhang XH, Šarić T, Mehrjardi NZ, Hamad S, Morad M. Acid-Sensitive Ion Channels Are Expressed in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes. Stem Cells Dev 2019; 28:920-932. [PMID: 31119982 DOI: 10.1089/scd.2018.0234] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are potential sources for cardiac regeneration and drug development. hiPSC-CMs express all the cardiac ion channels and the unique cardiac Ca2+-signaling phenotype. In this study, we tested for expression of acid sensing ion channels (ASICs) in spontaneously beating cardiomyocytes derived from three different hiPSC lines (IMR-90, iPSC-K3, and Ukki011-A). Rapid application of solutions buffered at pH 6.7, 6.0, or 5.0 triggered rapidly activating and slowly inactivating voltage-independent inward current that reversed at voltages positive to ENa, was suppressed by 5 μM amiloride and withdrawal of [Na+]o, like neuronal ASIC currents. ASIC currents were expressed at much lower percentages and densities in undifferentiated hiPSC and in dermal fibroblasts. ASIC1 mRNA and protein were measured in first 60 days but decreased in 100 days postdifferentiation hiPSC cultures. Hyperacidification (pH 5 and 6) also triggered large Ca2+ transients in intact hiPSC-CMs that were neither ruthenium red nor amiloride-sensitive, but were absent in whole cell-clamped hiPSC-CMs. Neither ASIC1 current nor its protein was detected in rat adult cardiomyocytes, but hyperacidification did activate smaller and slowly activating currents with drug sensitivity similar to TRPV channels. Considering ASIC expression in developing but not adult myocardium, a role in heart development is likely.
Collapse
Affiliation(s)
- Xiao-Hua Zhang
- 1Cardiac Signaling Center of University of South Carolina, Medical University of South Carolina, Clemson University, Charleston, South Carolina
| | - Tomo Šarić
- 2Medical Faculty, Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Cologne, Germany
| | - Narges Zare Mehrjardi
- 2Medical Faculty, Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Cologne, Germany
| | - Sarkawt Hamad
- 2Medical Faculty, Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Cologne, Germany
| | - Martin Morad
- 1Cardiac Signaling Center of University of South Carolina, Medical University of South Carolina, Clemson University, Charleston, South Carolina
| |
Collapse
|
22
|
Chauhan AS, Sahoo GC, Dikhit MR, Das P. Acid-Sensing Ion Channels Structural Aspects, Pathophysiological Importance and Experimental Mutational Data Available Across Various Species to Target Human ASIC1. Curr Drug Targets 2018; 20:111-121. [DOI: 10.2174/1389450119666180820103316] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 08/01/2018] [Accepted: 08/15/2018] [Indexed: 01/16/2023]
Abstract
The H+-gated (proton) currents are widely present in brain sensory neuronal system and
various studies identified the structural units and deciphered the physiological and pathological function
of ion channels. The normal neuron requires an optimal pH to carry out its functions. In acidosis,
the ASICs (Acid-sensing Ion Channels) are activated in both the CNS (central nervous system) and
PNS (peripheral nervous system). ASICs are related to degenerin channels (DEGs), epithelial sodium
cation channels (ENaCs), and FMRF-amide (Phe-Met-Arg-Phe-NH2)-gated channels (FaNaC). Its activation
leads physiologically to pain perception, synaptic plasticity, learning and memory, fear,
ischemic neuronal injury, seizure termination, neuronal degeneration, and mechanosensation. It detects
the level of acid fluctuation in the extracellular environment and responds to acidic pH by increasing
the rate of membrane depolarization. It conducts cations like Na+ (Sodium) and Ca2+ (Calcium)
ions across the membrane upon protonation. The ASICs subtypes are characterized by differing
biophysical properties and pH sensitivities. The subtype ASIC1 is involved in various CNS diseases
and therefore focusing on its specific functional properties will guide in drug design methods. The review
highlights the cASIC1 (Chicken ASIC1) crystal structures, involvement in physiological environment
and limitations of currently available inhibitors. In addition, it details the mutational data
available to design an inhibitor against hASIC1 (Human ASIC1).
Collapse
Affiliation(s)
- Anurag Singh Chauhan
- Biomedical Informatics, Rajendra Memorial Research Institute of Medical Sciences (Indian Council of Medical Research), Agamkuan, Patna- 800 007, Bihar, India
| | - Ganesh Chandra Sahoo
- Biomedical Informatics, Rajendra Memorial Research Institute of Medical Sciences (Indian Council of Medical Research), Agamkuan, Patna- 800 007, Bihar, India
| | - Manas Ranjan Dikhit
- Biomedical Informatics, Rajendra Memorial Research Institute of Medical Sciences (Indian Council of Medical Research), Agamkuan, Patna- 800 007, Bihar, India
| | - Pradeep Das
- Department of Molecular Parasitology, Rajendra Memorial Research Institute of Medical Sciences (Indian Council of Medical Research), Agamkuan, Patna- 800 007, Bihar, India
| |
Collapse
|
23
|
Buckley BJ, Aboelela A, Minaei E, Jiang LX, Xu Z, Ali U, Fildes K, Cheung CY, Cook SM, Johnson DC, Bachovchin DA, Cook GM, Apte M, Huang M, Ranson M, Kelso MJ. 6-Substituted Hexamethylene Amiloride (HMA) Derivatives as Potent and Selective Inhibitors of the Human Urokinase Plasminogen Activator for Use in Cancer. J Med Chem 2018; 61:8299-8320. [PMID: 30130401 DOI: 10.1021/acs.jmedchem.8b00838] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Metastasis is the cause of death in the majority (∼90%) of malignant cancers. The oral potassium-sparing diuretic amiloride and its 5-substituted derivative 5 -N, N-(hexamethylene)amiloride (HMA) reportedly show robust antitumor/metastasis effects in multiple in vitro and animal models. These effects are likely due, at least in part, to inhibition of the urokinase plasminogen activator (uPA), a key protease determinant of cell invasiveness and metastasis. This study reports the discovery of 6-substituted HMA analogs that show nanomolar potency against uPA, high selectivity over related trypsin-like serine proteases, and minimal inhibitory effects against epithelial sodium channels (ENaC), the diuretic and antikaliuretic target of amiloride. Reductions in lung metastases were demonstrated for two analogs in a late-stage experimental mouse metastasis model, and one analog completely inhibited formation of liver metastases in an orthotopic xenograft mouse model of pancreatic cancer. The results support further evaluation of 6-substituted HMA derivatives as uPA-targeting anticancer drugs.
Collapse
Affiliation(s)
- Benjamin J Buckley
- Molecular Horizons and School of Chemistry & Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia.,Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia
| | - Ashraf Aboelela
- Molecular Horizons and School of Chemistry & Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia.,Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia
| | - Elahe Minaei
- Molecular Horizons and School of Chemistry & Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia.,Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia
| | - Longguang X Jiang
- National Joint Biomedical Engineering Research Centre on Photodynamic Technologies , Fuzhou University , Fujian 350116 , China
| | - Zhihong Xu
- Pancreatic Research Group, South Western Sydney Clinical School , University of New South Wales, and Ingham Institute for Applied Medical Research , Liverpool , NSW 2170 , Australia
| | - Umar Ali
- Molecular Horizons and School of Chemistry & Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia.,Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia
| | - Karen Fildes
- Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia.,Graduate School of Medicine , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - Chen-Yi Cheung
- Department of Microbiology and Immunology , University of Otago , Otago 9016 , New Zealand
| | - Simon M Cook
- Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia
| | - Darren C Johnson
- Tri-Institutional PhD Program in Chemical Biology , Memorial Sloan Kettering Cancer Center , New York , New York 10065 , United States
| | - Daniel A Bachovchin
- Tri-Institutional PhD Program in Chemical Biology , Memorial Sloan Kettering Cancer Center , New York , New York 10065 , United States.,Chemical Biology Program , Memorial Sloan Kettering Cancer Center , New York , New York 10065 , United States
| | - Gregory M Cook
- Department of Microbiology and Immunology , University of Otago , Otago 9016 , New Zealand
| | - Minoti Apte
- Pancreatic Research Group, South Western Sydney Clinical School , University of New South Wales, and Ingham Institute for Applied Medical Research , Liverpool , NSW 2170 , Australia
| | - Mingdong Huang
- National Joint Biomedical Engineering Research Centre on Photodynamic Technologies , Fuzhou University , Fujian 350116 , China
| | - Marie Ranson
- Molecular Horizons and School of Chemistry & Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia.,Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia
| | - Michael J Kelso
- Molecular Horizons and School of Chemistry & Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia.,Illawarra Health & Medical Research Institute , Wollongong , NSW 2522 , Australia
| |
Collapse
|
24
|
Zhou RP, Leng TD, Yang T, Chen FH, Xiong ZG. Acute Ethanol Exposure Promotes Autophagy-Lysosome Pathway-Dependent ASIC1a Protein Degradation and Protects Against Acidosis-Induced Neurotoxicity. Mol Neurobiol 2018; 56:3326-3340. [PMID: 30120732 DOI: 10.1007/s12035-018-1289-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 07/31/2018] [Indexed: 12/12/2022]
Abstract
Tissue acidosis is a common feature of brain ischemia which causes neuronal injury. Activation of acid-sensing ion channel 1a (ASIC1a) plays an important role in acidosis-mediated neurotoxicity. Acute ethanol administration has been shown to provide neuroprotective effects during ischemic stroke, but the precise mechanisms have yet to be determined. In this study, we investigated the effect of ethanol on the activity/expression of ASIC1a channels and acidosis-induced neurotoxicity. We showed that acute treatment of neuronal cells with ethanol for more than 3 h could reduce ASIC1a protein expression, ASIC currents, and acid-induced [Ca2+]i elevation. We further demonstrated that ethanol-induced reduction of ASIC1a expression is mediated by autophagy-lysosome pathway (ALP)-dependent protein degradation. Finally, we showed that ethanol protected neuronal cells against acidosis-induced cytotoxicity, which effect was mimicked by autophagy activator rapamycin and abolished by autophagy inhibitor CQ. Together, these results indicate that moderate acute ethanol exposure can promote autophagy-lysosome pathway-dependent ASIC1a protein degradation and protect against acidosis-induced neurotoxicity.
Collapse
Affiliation(s)
- Ren-Peng Zhou
- Department of Pharmacology, The Second Hospital of Anhui Medical University, Hefei, 230601, China
- Neurobiology, Neuroscience Institute, Morehouse School of Medicine, Atlanta, 30310, USA
| | - Tian-Dong Leng
- Neurobiology, Neuroscience Institute, Morehouse School of Medicine, Atlanta, 30310, USA
| | - Tao Yang
- Neurobiology, Neuroscience Institute, Morehouse School of Medicine, Atlanta, 30310, USA
| | - Fei-Hu Chen
- School of Pharmacy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, China.
| | - Zhi-Gang Xiong
- Neurobiology, Neuroscience Institute, Morehouse School of Medicine, Atlanta, 30310, USA.
| |
Collapse
|
25
|
Krauson AJ, Rooney JG, Carattino MD. Molecular basis of inhibition of acid sensing ion channel 1A by diminazene. PLoS One 2018; 13:e0196894. [PMID: 29782492 PMCID: PMC5962070 DOI: 10.1371/journal.pone.0196894] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 04/20/2018] [Indexed: 11/18/2022] Open
Abstract
Acid-sensing ion channels (ASICs) are trimeric proton-gated cation permeable ion channels expressed primarily in neurons. Here we employed site-directed mutagenesis and electrophysiology to investigate the mechanism of inhibition of ASIC1a by diminazene. This compound inhibits mouse ASIC1a with a half-maximal inhibitory concentration (IC50) of 2.4 μM. At first, we examined whether neutralizing mutations of Glu79 and Glu416 alter diminazene block. These residues form a hexagonal array in the lower palm domain that was previously shown to contribute to pore opening in response to extracellular acidification. Significantly, single Gln substitutions at positions 79 and 416 in ASIC1a reduced diminazene apparent affinity by 6-7 fold. This result suggests that diminazene inhibits ASIC1a in part by limiting conformational rearrangement in the lower palm domain. Because diminazene is charged at physiological pHs, we assessed whether it inhibits ASIC1a by blocking the ion channel pore. Consistent with the notion that diminazene binds to a site within the membrane electric field, diminazene block showed a strong dependence with the membrane potential. Moreover, a Gly to Ala mutation at position 438, in the ion conduction pathway of ASIC1a, increased diminazene IC50 by one order of magnitude and eliminated the voltage dependence of block. Taken together, our results indicate that the inhibition of ASIC1a by diminazene involves both allosteric modulation and blocking of ion flow through the conduction pathway. Our findings provide a foundation for the development of more selective and potent ASIC pore blockers.
Collapse
Affiliation(s)
- Aram J Krauson
- Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - James G Rooney
- Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Marcelo D Carattino
- Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America.,Department of Cell Biology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| |
Collapse
|
26
|
Schmidt A, Bauknecht P, Williams EA, Augustinowski K, Gründer S, Jékely G. Dual signaling of Wamide myoinhibitory peptides through a peptide‐gated channel and a GPCR in
Platynereis. FASEB J 2018; 32:5338-5349. [DOI: 10.1096/fj.201800274r] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Axel Schmidt
- Institute of Physiology, Rheinisch‐Westfälische Technische Hochschule (RWTH) Aachen UniversityAachenGermany
| | | | | | - Katrin Augustinowski
- Institute of Physiology, Rheinisch‐Westfälische Technische Hochschule (RWTH) Aachen UniversityAachenGermany
| | - Stefan Gründer
- Institute of Physiology, Rheinisch‐Westfälische Technische Hochschule (RWTH) Aachen UniversityAachenGermany
| | - Gáspár Jékely
- Living Systems Institute, University of ExeterExeterUnited Kingdom
| |
Collapse
|
27
|
Chauhan AS, Ansari MY, Mansuri R, Dikhit MR, Ali V, Sahoo GC, Das P. Computational elucidation, mutational and hot spot-based designing of potential inhibitors against human acid-sensing ion channels (hASIC-1a) to treat various physiological conditions. J Biomol Struct Dyn 2017; 36:3513-3530. [PMID: 29039242 DOI: 10.1080/07391102.2017.1392364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Acid-sensing ion channels are ligand/proton-gated ion channels belonging to the family of the degenerin/epithelial Na+ channel (DEG/ENaC). They function as a sodium-selective pore for Ca2+ entry into neuronal cells during pathological conditions. The blocking of this channel has therapeutic importance, because at basal physiological pH (7.2), it is in a closed state and under a more acidic condition, and the ASIC1a ion channel is activated. To investigate the different states of the hASIC1a channel based on mutational analysis, structure-based virtual screening and molecular dynamics simulation studies. The system showed stability after 30 ns (after 1500 frame), and it was stabilized to an average value around 2.2Å. During the simulation, the ion channel residues in persistent contact with toxin PcTx1 were D237, E238, D347, D351, E219 and E355. These residues are important physiologically for the activation of the channel. From in silico alanine scanning, the significant hotspots obtained in hASIC1 are E344, P347, F352, D351, E355 and E219. From the sitemap analysis, it was evident that the sitemap found one of the active sites at the PcTx1 binding site with a site score of 1.086 and a D-score of 1.035 for hASIC1. We obtained a few promising hits and final potential hits from the virtual screening in hASIC1 that made interactions with the residues in the acidic pocket (E344, P347, F352, D351, E355 and E219). Based on these studies, the hits and scaffolds of potential therapeutic interest against various pathological conditions are associated with hASIC1a for future studies.
Collapse
Affiliation(s)
- Anurag Singh Chauhan
- a Biomedical Informatics, Indian Council of Medical Research , Rajendra Memorial Research Institute of Medical Sciences , Agamkuan, Patna 800 007 , Bihar , India.,d Department of Pharmacoinformatics , National Institute of Pharmaceutical Education and Research , Hajipur 844 102 , Bihar , India
| | - Md Yousuf Ansari
- b Deparment of Pharmaceutical Chemistry , M.M. College of Pharmacy, Maharishi Markandeshwar University , Mullana 133207 , Haryana , India.,d Department of Pharmacoinformatics , National Institute of Pharmaceutical Education and Research , Hajipur 844 102 , Bihar , India
| | - Rani Mansuri
- a Biomedical Informatics, Indian Council of Medical Research , Rajendra Memorial Research Institute of Medical Sciences , Agamkuan, Patna 800 007 , Bihar , India.,d Department of Pharmacoinformatics , National Institute of Pharmaceutical Education and Research , Hajipur 844 102 , Bihar , India
| | - Manas Ranjan Dikhit
- a Biomedical Informatics, Indian Council of Medical Research , Rajendra Memorial Research Institute of Medical Sciences , Agamkuan, Patna 800 007 , Bihar , India
| | - Vahab Ali
- a Biomedical Informatics, Indian Council of Medical Research , Rajendra Memorial Research Institute of Medical Sciences , Agamkuan, Patna 800 007 , Bihar , India
| | - Ganesh Chandra Sahoo
- a Biomedical Informatics, Indian Council of Medical Research , Rajendra Memorial Research Institute of Medical Sciences , Agamkuan, Patna 800 007 , Bihar , India
| | - Pradeep Das
- c Department of Molecular Parasitology, Indian Council of Medical Research , Rajendra Memorial Research Institute of Medical Sciences , Agamkuan, Patna 800 007 , Bihar , India
| |
Collapse
|
28
|
Liu J, Tao H, Wang H, Dong F, Zhang R, Li J, Ge P, Song P, Zhang H, Xu P, Liu X, Shen C. Biological Behavior of Human Nucleus Pulposus Mesenchymal Stem Cells in Response to Changes in the Acidic Environment During Intervertebral Disc Degeneration. Stem Cells Dev 2017; 26:901-911. [PMID: 28298159 DOI: 10.1089/scd.2016.0314] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
An acidic environment is vital for the maintenance of cellular activities but can be affected tremendously during intervertebral disc degeneration (IVDD). The effect of changes in the acidity of the environment on human nucleus pulposus mesenchymal stem cells (NP-MSCs) is, however, unknown. Thus, this study aimed to observe the biological effects of acidic conditions mimicking a degenerated intervertebral disc on NP-MSCs in vitro. NP-MSCs were isolated from patients with lumbar disc herniation and were further identified by their immunophenotypes and multilineage differentiation. Then, cells were cultured at acidic pH levels (pH 6.2, pH 6.5, pH 6.8, pH 7.1, and pH 7.4) with/without amiloride, an acid-sensing ion channel (ASIC) blocker. The proliferation and apoptosis of NP-MSCs and the expression of stem cell-related genes (Oct4, Nanog, Jagged, Notch1), ASICs, and functional genes (Aggrecan, SOX-9, Collagen-I, and Collagen-II) in NP-MSCs were evaluated. Our work showed that cells obtained from human degenerated NP met the criteria of International Society for Cellular Therapy. Therefore, cells obtained from a degenerated nucleus pulposus were definitively identified as NP-MSCs. Our results also indicated that acidic conditions could significantly inhibit cell proliferation and increase cell apoptosis. Gene expression results demonstrated that acidic conditions could decrease the expression of stem cell-related genes and inhibit extracellular matrix synthesis, whereas it could increase the expression of ASICs. Our study further verified that the above-mentioned biological activities of NP-MSCs could be significantly improved by amiloride. Therefore, the results of the study indicated that the biological behavior of NP-MSCs could be inhibited by acidic conditions during IVDD, and amiloride may meliorate IVDD by improving the activities of NP-MSCs.
Collapse
Affiliation(s)
- Jianjun Liu
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Hui Tao
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Hanbang Wang
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Fulong Dong
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Renjie Zhang
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Jie Li
- 2 Department of Clinical Laboratory, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Peng Ge
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Peiwen Song
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Huaqing Zhang
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Peng Xu
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| | - Xiaoying Liu
- 3 Biology Department, School of Life Science, Anhui Medical University , Hefei, People's Republic of China
| | - Cailiang Shen
- 1 Department of Spine Surgery, The First Affiliated Hospital of Anhui Medical University , Hefei, People's Republic of China
| |
Collapse
|
29
|
Mazzone GL, Veeraraghavan P, Gonzalez-Inchauspe C, Nistri A, Uchitel OD. ASIC channel inhibition enhances excitotoxic neuronal death in an in vitro model of spinal cord injury. Neuroscience 2016; 343:398-410. [PMID: 28003157 DOI: 10.1016/j.neuroscience.2016.12.008] [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: 08/31/2016] [Revised: 11/23/2016] [Accepted: 12/04/2016] [Indexed: 01/06/2023]
Abstract
In the spinal cord high extracellular glutamate evokes excitotoxic damage with neuronal loss and severe locomotor impairment. During the cell dysfunction process, extracellular pH becomes acid and may activate acid-sensing ion channels (ASICs) which could be important contributors to neurodegenerative pathologies. Our previous studies have shown that transient application of the glutamate analog kainate (KA) evokes delayed excitotoxic death of spinal neurons, while white matter is mainly spared. The present goal was to enquire if ASIC channels modulated KA damage in relation to locomotor network function and cell death. Mouse spinal cord slices were treated with KA (0.01 or 0.1mM) for 1h, and then washed out for 24h prior to analysis. RT-PCR results showed that KA (at 0.01mM concentration that is near-threshold for damage) increased mRNA expression of ASIC1a, ASIC1b, ASIC2 and ASIC3, an effect reversed by the ASIC inhibitor 4',6-diamidino-2-phenylindole (DAPI). A KA neurotoxic dose (0.1mM) reduced ASIC1a and ASIC2 expression. Cell viability assays demonstrated KA-induced large damage in spinal slices from mice with ASIC1a gene ablation. Likewise, immunohistochemistry indicated significant neuronal loss when KA was followed by the ASIC inhibitors DAPI or amiloride. Electrophysiological recording from ventral roots of isolated spinal cords showed that alternating oscillatory cycles were slowed down by 0.01mMKA, and intensely inhibited by subsequently applied DAPI or amiloride. Our data suggest that early rise in ASIC expression and function counteracted deleterious effects on spinal networks by raising the excitotoxicity threshold, a result with potential implications for improving neuroprotection.
Collapse
Affiliation(s)
- Graciela L Mazzone
- Laboratorios de Investigación aplicada en Neurociencias (LIAN) - Fundación para la Lucha conntra las Enfermedades Neurológicas de la Infancia (FLENI), CONICET, Buenos Aires, Argentina.
| | | | - Carlota Gonzalez-Inchauspe
- Instituto de Fisiología, Biología molecular y Neurociencias, CONICET, Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
| | - Andrea Nistri
- Neuroscience Department, International School for Advanced Studies (SISSA), Trieste, Italy; Spinal Person Injury Neurorehabilitation Applied Laboratory (SPINAL), Istituto di Medicina Fisica e Riabilitazione, Udine, Italy
| | - Osvaldo D Uchitel
- Instituto de Fisiología, Biología molecular y Neurociencias, CONICET, Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
| |
Collapse
|
30
|
Wu BM, Leng TD, Inoue K, Li J, Xiong ZG. Effect of Redox-Modifying Agents on the Activity of Channelrhodopsin-2. CNS Neurosci Ther 2016; 23:216-221. [PMID: 27917616 DOI: 10.1111/cns.12662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 11/07/2016] [Accepted: 11/08/2016] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND The algal protein Channelrhodopsin-2 (ChR2) has been widely used in recent years in optogenetic technique to investigate the functions of complex neuronal networks through minimally invasive and temporally precise photostimulation of genetically defined neurons. However, as with any other new technique, current optogentic approaches have various limitations. In addition, how ChR2 may behave in response to complex biochemical changes associated with various physiological/pathological conditions is largely unknown. AIM In this study, we investigated whether a change in redox state of the cell affects the activity of ChR2 channels. METHODS Whole-cell patch-clamp recordings were used to examine the effect of reducing and oxidizing agents on ChR2 currents activated by blue light. RESULTS We show that the reducing agent dithiothreitol (DTT) dramatically potentiates the ChR2 currents in a reversible and concentration-dependent manner. Glutathione, an endogenous reducing agent, shows a similar effect on ChR2 currents. The oxidizing agent 5,5'-dithio-bis-(2-nitrobenzoic acid) (DTNB) has no effect on ChR2 currents by itself; however, it completely reverses the potentiating effect of DTT. DTT also causes a shift in the current-voltage relationship by 23 ± 4.31 mV, suggesting a change in ion selectivity. CONCLUSION Taken together, these data suggest that redox modification of ChR2 plays an important role in its sensitivity to the light stimulation. Our findings not only help for a better understanding of how ChR2 may behave in physiological/pathological conditions where changes in redox state are common, but also provide a new direction for further optimization of this important opsin.
Collapse
Affiliation(s)
- Bao-Ming Wu
- School of Pharmacy, Anhui Medical University, Hefei, China.,Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA, USA
| | - Tian-Dong Leng
- Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA, USA
| | - Koichi Inoue
- Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Jun Li
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Zhi-Gang Xiong
- School of Pharmacy, Anhui Medical University, Hefei, China.,Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA, USA
| |
Collapse
|
31
|
Kondengaden SM, Luo LF, Huang K, Zhu M, Zang L, Bataba E, Wang R, Luo C, Wang B, Li KK, Wang PG. Discovery of novel small molecule inhibitors of lysine methyltransferase G9a and their mechanism in leukemia cell lines. Eur J Med Chem 2016; 122:382-393. [PMID: 27393948 DOI: 10.1016/j.ejmech.2016.06.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 06/13/2016] [Accepted: 06/15/2016] [Indexed: 01/24/2023]
Abstract
Lysine methyltransferase G9a regulates the transcription of multiple genes by primarily catalyzing mono- and di-methylation of histone H3 lysine 9, as well as several non-histone lysine sites. An attractive therapeutic target in treating leukemia, knockout studies of G9a in mice have found dramatically slowed proliferation and self-renewal of acute myeloid leukemia (AML) cells due to the attenuation of HoxA9-dependent transcription. In this study, a series of compounds were identified as potential inhibitors through structure-based virtual screening. Among these compounds, a new G9a inhibitor, DCG066, was confirmed by in vitro biochemical, and cell based enzyme assays. DCG066 has a novel molecular scaffold unlike other G9a inhibitors presently available. Similar to G9a's histone substrate, DCG066 can bind directly to G9a and inhibit methyltransferase activity in vitro. In addition to suppressing G9a methyltransferase activity and reducing histone H3 methylation levels, DCG066 displays low cytotoxicity in leukemia cell lines with high levels of G9a expression, including K562. This work presents DCG066 as an inhibitor of G9a with a novel structure, providing both a lead in G9a inhibitor design and a means for probing the functionality of G9a.
Collapse
Affiliation(s)
- Shukkoor M Kondengaden
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA
| | - Liu-Fei Luo
- State Key Laboratory of Medical Genomics, Shanghai Jiao Tong University, Shanghai, China
| | - Kenneth Huang
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA
| | - Mengyuan Zhu
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA
| | - Lanlan Zang
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA; Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics), School of Pharmacy, Tianjin Medical University, Tianjin 300070, China
| | - Eudoxie Bataba
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA
| | - Runling Wang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics), School of Pharmacy, Tianjin Medical University, Tianjin 300070, China
| | - Cheng Luo
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Binghe Wang
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA
| | - Keqin Kathy Li
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA; State Key Laboratory of Medical Genomics, Shanghai Jiao Tong University, Shanghai, China.
| | - Peng George Wang
- Chemistry Department and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA.
| |
Collapse
|