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Tarasenko O, Voytenko S, Koval L, Lykhmus O, Kalashnyk O, Skok M. Unusual properties of α7 nicotinic acetylcholine receptor ion channels in B lymphocyte-derived SP-2/0 cells. Int Immunopharmacol 2020; 82:106373. [PMID: 32163855 DOI: 10.1016/j.intimp.2020.106373] [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: 01/27/2020] [Revised: 02/25/2020] [Accepted: 03/02/2020] [Indexed: 12/30/2022]
Abstract
This study demonstrates the presence of α7 nicotinic acetylcholine receptors (nAChR) in B lymphocyte-derived SP-2/0 cells by means of flow cytometry and immunocytochemistry. According to lectin and sandwich ELISA, the α7 subunits expressed in SP-2/0 cells are more glycosylated compared to those expressed in the brain or normal B lymphocytes and are combined with β2 subunits. At zero and negative pipette potentials, either acetylcholine or α7-specific agonist PNU282987 stimulated the ion channel activity in SP-2/0 cells revealed by single channel patch-clamp recordings. The conductivity was within the range of 19 to 39 pS and reversal potential was between -17 mV and +28 mV, the currents were potentiated by α7-specific positive allosteric modulator PNU120596 and were partially blocked by α7-specific antagonist methyllicaconitine (MLA). However, they were oriented downwards suggesting that the channels mediated the cation outflux rather than influx. As shown by Ca2+ imaging studies, PNU282987 did not stimulate immediate Ca2+ influx into SP-2/0 cells. Instead, Ca2+ influx through Ca-release-activated channels (CRACs) was observed within minutes after either PNU282987 or MLA application. It is concluded that SP-2/0 express α7β2 nAChRs, which mediate the cation outflux under negative pipette potentials applied, possibly, due to depolarized membrane or negative surface charge formed by carbohydrate residues. In addition, α7β2 nAChRs may influence CRACs in ion-independent way.
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Affiliation(s)
| | - Sergiy Voytenko
- Bogomoletz Institute of Physiology, 4, Bogomoletz Str, 01024 Kyiv, Ukraine
| | - Lyudmyla Koval
- Palladin Institute of Biochemistry, 9, Leontovycha Str., 01030 Kyiv, Ukraine.
| | - Olena Lykhmus
- Palladin Institute of Biochemistry, 9, Leontovycha Str., 01030 Kyiv, Ukraine
| | - Olena Kalashnyk
- Palladin Institute of Biochemistry, 9, Leontovycha Str., 01030 Kyiv, Ukraine
| | - Maryna Skok
- Palladin Institute of Biochemistry, 9, Leontovycha Str., 01030 Kyiv, Ukraine.
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John D, Shelukhina I, Yanagawa Y, Deuchars J, Henderson Z. Functional alpha7 nicotinic receptors are expressed on immature granule cells of the postnatal dentate gyrus. Brain Res 2014; 1601:15-30. [PMID: 25553616 PMCID: PMC4350854 DOI: 10.1016/j.brainres.2014.12.041] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Accepted: 12/19/2014] [Indexed: 02/07/2023]
Abstract
Neurogenesis occurs throughout life in the subgranular zone of the dentate gyrus, and postnatal-born granule cells migrate into the granule cell layer and extend axons to their target areas. The α7*nicotinic receptor has been implicated in neuronal maturation during development of the brain and is abundant in interneurons of the hippocampal formation of the adult brain. Signalling through these same receptors is believed also to promote maturation and integration of adult-born granule cells in the hippocampal formation. We therefore aimed to determine whether functional α7*nicotinic receptors are expressed in developing granule cells of the postnatal dentate gyrus. For these experiments we used 2-3 week-old Wistar rats, and 2-9 week old transgenic mice in which GABAergic interneurons were marked by expression of green fluorescent protein. Immunohistochemistry indicated the presence of α7*nicotinic receptor subunits around granule cells close around the subgranular zone which correlated with the distribution of developmental markers for immature granule cells. Whole-cell patch clamp recording showed that a proportion of granule cells responded to puffed ACh in the presence of atropine, and that these cells possessed electrophysiological properties found in immature granule cells. The nicotinic responses were potentiated by an allosteric α7*nicotinic receptor modulator, which were blocked by a specific α7*nicotinic receptor antagonist and were not affected by ionotropic glutamate or GABA receptor antagonists. These results suggest the presence of functional somato-dendritic α7*nicotinic receptors on immature granule cells of the postnatal dentate gyrus, consistent with studies implicating α7*nicotinic receptors in dendritic maturation of dentate gyrus neurons in adult brain.
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Affiliation(s)
- Danielle John
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK.
| | - Irina Shelukhina
- Department of Molecular Basis of Neurosignaling, Laboratory of Molecular Toxinology, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow V-437, Russia
| | - Yuchio Yanagawa
- Department of Genetic and Behavioural Neuroscience, Gunma University Graduate School of Medicine, Maebashi 371-8511, Japan; Japan Science and Technology Agency, CREST, Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Jim Deuchars
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Zaineb Henderson
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
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Lykhmus O, Gergalova G, Koval L, Zhmak M, Komisarenko S, Skok M. Mitochondria express several nicotinic acetylcholine receptor subtypes to control various pathways of apoptosis induction. Int J Biochem Cell Biol 2014; 53:246-52. [PMID: 24880090 DOI: 10.1016/j.biocel.2014.05.030] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/07/2014] [Accepted: 05/19/2014] [Indexed: 11/18/2022]
Abstract
Nicotinic acetylcholine receptors control survival, proliferation and cytokine release in non-excitable cells. Previously we reported that α7 nicotinic receptors were present in the outer membranes of mouse liver mitochondria to regulate mitochondrial pore formation and cytochrome c release. Here we used a wide spectrum of nicotinic receptor subunit-specific antibodies to show that mitochondria express several nicotinic receptor subtypes in a tissue-specific manner: brain and liver mitochondria contain α7β2, α4β2 and less α3β2 nicotinic receptors, while mitochondria from the lung express preferentially α3β4 receptor subtype; all of them are non-covalently connected to voltage-dependent anion channels and control cytochrome c release. By using selective ligands of different nicotinic receptor subtypes (acetylcholine (1 μM) or dihydro-β-erythroidine (1 μM) for α4β2), conotoxin MII (1 nM) for α3β2, MLA (50 nM) for α7β2 and acetylcholine (10 μM) for all subtypes) and apoptogenic agents triggering different mitochondrial signaling pathways (1 μM wortmannin, 90 μM Ca(2+) or 0.5 mM H₂O₂) it was found that α7β2 receptors affect mainly PI₃K/Akt pathway, while α3β2 and α4β2 nAChRs also significantly influence CaKMII- and Src-dependent pathways. It is concluded that cholinergic regulation in mitochondria is realized through multiple nicotinic receptor subtypes, which control various pathways inducing mitochondrial type of apoptosis.
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Affiliation(s)
- Olena Lykhmus
- Palladin Institute of Biochemistry, 9, Leontovicha str., 01601 Kyiv, Ukraine
| | - Galyna Gergalova
- Palladin Institute of Biochemistry, 9, Leontovicha str., 01601 Kyiv, Ukraine
| | - Lyudmyla Koval
- Palladin Institute of Biochemistry, 9, Leontovicha str., 01601 Kyiv, Ukraine
| | - Maxim Zhmak
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, 16/10, Miklukho-Maklaya str., 117997 Moscow, Russian Federation
| | - Sergiy Komisarenko
- Palladin Institute of Biochemistry, 9, Leontovicha str., 01601 Kyiv, Ukraine
| | - Maryna Skok
- Palladin Institute of Biochemistry, 9, Leontovicha str., 01601 Kyiv, Ukraine.
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Skok MV. Nicotinic acetylcholine receptors: specific antibodies and functions in humoral immunity. UKRAINIAN BIOCHEMICAL JOURNAL 2013. [DOI: 10.15407/ubj85.06.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Gergalova G, Lykhmus O, Kalashnyk O, Koval L, Chernyshov V, Kryukova E, Tsetlin V, Komisarenko S, Skok M. Mitochondria express α7 nicotinic acetylcholine receptors to regulate Ca2+ accumulation and cytochrome c release: study on isolated mitochondria. PLoS One 2012; 7:e31361. [PMID: 22359587 PMCID: PMC3281078 DOI: 10.1371/journal.pone.0031361] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Accepted: 01/06/2012] [Indexed: 11/30/2022] Open
Abstract
Nicotinic acetylcholine receptors (nAChRs) are ligand-gated ion channels that mediate synaptic transmission in the muscle and autonomic ganglia and regulate transmitter release in the brain. The nAChRs composed of α7 subunits are also expressed in non-excitable cells to regulate cell survival and proliferation. Up to now, functional α7 nAChRs were found exclusively on the cell plasma membrane. Here we show that they are expressed in mitochondria and regulate early pro-apoptotic events like cytochrome c release. The binding of α7-specific antibody with mouse liver mitochondria was revealed by electron microscopy. Outer membranes of mitochondria from the wild-type and β2−/− but not α7−/− mice bound α7 nAChR-specific antibody and toxins: FITC-labeled α-cobratoxin or Alexa 555-labeled α-bungarotoxin. α7 nAChR agonists (1 µM acetylcholine, 10 µM choline or 30 nM PNU-282987) impaired intramitochondrial Ca2+ accumulation and significantly decreased cytochrome c release stimulated with either 90 µM CaCl2 or 0.5 mM H2O2. α7-specific antagonist methyllicaconitine (50 nM) did not affect Ca2+ accumulation in mitochondria but attenuated the effects of agonists on cytochrome c release. Inhibitor of voltage-dependent anion channel (VDAC) 4,4′-diisothio-cyano-2,2′-stilbene disulfonic acid (0.5 µM) decreased cytochrome c release stimulated with apoptogens similarly to α7 nAChR agonists, and VDAC was co-captured with the α7 nAChR from mitochondria outer membrane preparation in both direct and reverse sandwich ELISA. It is concluded that α7 nAChRs are expressed in mitochondria outer membrane to regulate the VDAC-mediated Ca2+ transport and mitochondrial permeability transition.
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Affiliation(s)
- Galyna Gergalova
- Department of Molecular Immunology, Palladin Institute of Biochemistry, Kyiv, Ukraine
| | - Olena Lykhmus
- Department of Molecular Immunology, Palladin Institute of Biochemistry, Kyiv, Ukraine
| | - Olena Kalashnyk
- Department of Molecular Immunology, Palladin Institute of Biochemistry, Kyiv, Ukraine
| | - Lyudmyla Koval
- Department of Molecular Immunology, Palladin Institute of Biochemistry, Kyiv, Ukraine
| | - Volodymyr Chernyshov
- Department of Molecular Immunology, Palladin Institute of Biochemistry, Kyiv, Ukraine
| | - Elena Kryukova
- Department of Molecular Bases of Neurosignaling, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Victor Tsetlin
- Department of Molecular Bases of Neurosignaling, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Sergiy Komisarenko
- Department of Molecular Immunology, Palladin Institute of Biochemistry, Kyiv, Ukraine
| | - Maryna Skok
- Department of Molecular Immunology, Palladin Institute of Biochemistry, Kyiv, Ukraine
- * E-mail:
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Lykhmus O, Koval L, Pavlovych S, Zouridakis M, Zisimopoulou P, Tzartos S, Tsetlin V, Volpina O, Cloëz-Tayarani I, Komisarenko S, Skok M. Functional effects of antibodies against non-neuronal nicotinic acetylcholine receptors. Immunol Lett 2010; 128:68-73. [DOI: 10.1016/j.imlet.2009.11.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2009] [Revised: 11/05/2009] [Accepted: 11/13/2009] [Indexed: 01/20/2023]
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Paulo JA, Brucker WJ, Hawrot E. Proteomic analysis of an alpha7 nicotinic acetylcholine receptor interactome. J Proteome Res 2009; 8:1849-58. [PMID: 19714875 DOI: 10.1021/pr800731z] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The alpha7 nicotinic acetylcholine receptor (nAChR) is well established as the principal high-affinity alpha-bungarotoxin-binding protein in the mammalian brain. We isolated carbachol-sensitive alpha-bungarotoxin-binding complexes from total mouse brain tissue by affinity immobilization followed by selective elution, and these proteins were fractionated by SDS-PAGE. The proteins in subdivided gel lane segments were tryptically digested, and the resulting peptides were analyzed by standard mass spectrometry. We identified 55 proteins in wild-type samples that were not present in comparable brain samples from alpha7 nAChR knockout mice that had been processed in a parallel fashion. Many of these 55 proteins are novel proteomic candidates for interaction partners of the alpha7 nAChR, and many are associated with multiple signaling pathways that may be implicated in alpha7 function in the central nervous system. The newly identified potential protein interactions, together with the general methodology that we introduce for alpha-bungarotoxin-binding protein complexes, form a new platform for many interesting follow-up studies aimed at elucidating the physiological role of neuronal alpha7 nAChRs.
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Affiliation(s)
- Joao A Paulo
- Graduate Program in Molecular Biology, Cell Biology and Biochemistry and Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, Rhode Island 02912, USA
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Tsetlin V, Shelukhina I, Kryukova E, Burbaeva G, Starodubtseva L, Skok M, Volpina O, Utkin Y. Detection of alpha7 nicotinic acetylcholine receptors with the aid of antibodies and toxins. Life Sci 2007; 80:2202-5. [PMID: 17275855 DOI: 10.1016/j.lfs.2007.01.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2006] [Revised: 11/28/2006] [Accepted: 01/05/2007] [Indexed: 11/18/2022]
Abstract
Neuronal nicotinic acetylcholine receptors (nAChRs) containing alpha7 subunit are well represented in the brain and some non-neuronal tissues, and their malfunctioning is associated with diverse pathologies. Therefore, detection and quantification of alpha7 nAChR are important tasks. The affinity-purified antibodies were prepared against the 1-23 and 179-190 fragments of the human and rat alpha7 nAChR extracellular domain. The specificity and selectivity of these alpha7 (1-23) and alpha7 (179-190) antibodies was tested by ELISA in model systems: the E. coli-expressed alpha7 subunit extracellular domain and the pituitary cell line GH(4)C(1) stably expressing human alpha7 nAChR. On the rat brain slices two antibodies and biotinylated alpha-cobratoxin specifically stained the hippocampus region known to be rich in alpha7 nAChR. Western blot analysis revealed that in the human thalamus membranes and in rat brain membranes, antibodies alpha7 (1-23) stained a single band of 62 kDa, while the alpha7 (179-190) antibodies stained a doublet of 53-54 kDa. The results obtained show that utilization of model systems and a combination of several antibodies with appropriately labeled toxins may provide better ways for detection of alpha7 nAChR.
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Affiliation(s)
- V Tsetlin
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, RAS, Moscow, Russia.
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