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Pastukhov A, Paliienko K, Pozdnyakova N, Krisanova N, Dudarenko M, Kalynovska L, Tarasenko A, Gnatyuk O, Dovbeshko G, Borisova T. Disposable facemask waste combustion emits neuroactive smoke particulate matter. Sci Rep 2023; 13:17771. [PMID: 37853141 PMCID: PMC10584905 DOI: 10.1038/s41598-023-44972-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 10/13/2023] [Indexed: 10/20/2023] Open
Abstract
Tremendous deposits of disposable medical facemask waste after the COVID-19 pandemic require improvement of waste management practice according to WHO report 2022, moreover facemasks are still in use around the world to protect against numerous airborne infections. Here, water-suspended smoke preparations from the combustion of disposable medical facemasks (polypropylene fibers) were collected; size, zeta potential, surface groups of smoke particulate matter were determined by dynamic light scattering, FTIR and Raman spectroscopy, and their optical properties were characterized. Neurochemical study using nerve terminals isolated from rat cortex revealed a significant decrease in the initial rate of the uptake/accumulation of excitatory and inhibitory neurotransmitters, L-[14C]glutamate and [3H]GABA, and exocytotic release, and also an increase in the extracellular level of these neurotransmitters. Fluorescent measurements revealed that ROS generation induced by hydrogen peroxide and glutamate receptor agonist kainate decreased in nerve terminals. A decrease in the membrane potential of nerve terminals and isolated neurons, the mitochondrial potential and synaptic vesicle acidification was also shown. Therefore, accidental or intentional utilization of disposable medical facemask waste by combustion results in the release of neuroactive ultrafine particulate matter to the environment, thereby contributing to plastic-associated pollution of air and water resources and neuropathology development and expansion.
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Affiliation(s)
- Artem Pastukhov
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine
| | - Konstantin Paliienko
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine.
| | - Natalia Pozdnyakova
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine
| | - Natalia Krisanova
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine
| | - Marina Dudarenko
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine
| | - Lilia Kalynovska
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine
| | - Alla Tarasenko
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine
| | - Olena Gnatyuk
- Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauky 46, Kyiv, 03028, Ukraine
| | - Galina Dovbeshko
- Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauky 46, Kyiv, 03028, Ukraine
| | - Tatiana Borisova
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kyiv, 01054, Ukraine
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Dudarenko MV, Pozdnyakova NG. Perinatal hypoxia and thalamus brain region: increased efficiency of antiepileptic drug levetiracetam to inhibit GABA release from nerve terminals. UKRAINIAN BIOCHEMICAL JOURNAL 2022. [DOI: 10.15407/ubj94.05.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Levetiracetam (LV), 2S-(2-oxo-1-pyrrolidiny1) butanamide, is an antiepileptic drug. The exact mechanisms of anticonvulsant effects of LV remain unclear. In this study, rats (Wistar strain) underwent hypoxia and seizures at the age of 10–12 postnatal days (pd). [3H]GABA release was analysed in isolated from thalamus nerve terminals (synaptosomes) during development at the age of pd 17–19 and pd 24–26 (infantile stage), pd 38–40 (puberty) and pd 66–73 (young adults) in control and after perinatal hypoxia. The extracellular level of [3H]GABA in the preparation of thalamic synaptosomes increased during development at the age of pd 38–40 and pd 66–73 as compared to earlier ones. LV did not influence the extracellular level of [3H]GABA in control and after perinatal hypoxia at all studied ages. Exocytotic [3H]GABA release in control increased at the age of pd 24–26 as compared to pd 17–19. After hypoxia, exocytotic [3H]GABA release from synaptosomes also increased during development. LV elevated [3H]GABA release from thalamic synaptosomes at the age of pd 66–73 after hypoxia and during blockage of GABA uptake by NO-711 only. LV realizes its antiepileptic effects at the presynaptic site through an increase in exocytotic release of [3H]GABA in thalamic synaptosomes after perinatal hypoxia at pd 66–73. LV exhibited a more significant effect in thalamic synaptosomes after perinatal hypoxia than in control ones. The action of LV is age-dependent, and the drug was inert at the infantile stage that can be useful for an LV application strategy in child epilepsy therapy. Keywords: brain development, exocytosis, GABA, levetiracetam, perinatal hypoxia, thalamic synaptosomes
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Krisanova N, Pozdnyakova N, Pastukhov A, Dudarenko M, Shatursky O, Gnatyuk O, Afonina U, Pyrshev K, Dovbeshko G, Yesylevskyy S, Borisova T. Amphiphilic anti-SARS-CoV-2 drug remdesivir incorporates into the lipid bilayer and nerve terminal membranes influencing excitatory and inhibitory neurotransmission. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183945. [PMID: 35461828 PMCID: PMC9023372 DOI: 10.1016/j.bbamem.2022.183945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 04/03/2022] [Accepted: 04/17/2022] [Indexed: 12/05/2022]
Abstract
Remdesivir is a novel antiviral drug, which is active against the SARS-CoV-2 virus. Remdesivir is known to accumulate in the brain but it is not clear whether it influences the neurotransmission. Here we report diverse and pronounced effects of remdesivir on transportation and release of excitatory and inhibitory neurotransmitters in rat cortex nerve terminals (synaptosomes) in vitro. Direct incorporation of remdesivir molecules into the cellular membranes was shown by FTIR spectroscopy, planar phospholipid bilayer membranes and computational techniques. Remdesivir decreases depolarization-induced exocytotic release of L-[14C] glutamate and [3H] GABA, and also [3H] GABA uptake and extracellular level in synaptosomes in a dose-dependent manner. Fluorimetric studies confirmed remdesivir-induced impairment of exocytosis in nerve terminals and revealed a decrease in synaptic vesicle acidification. Our data suggest that remdesivir dosing during antiviral therapy should be precisely controlled to prevent possible neuromodulatory action at the presynaptic level. Further studies of neurotropic and membranotropic effects of remdesivir are necessary.
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Affiliation(s)
- Natalia Krisanova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str., Kyiv 01054, Ukraine
| | - Natalia Pozdnyakova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str., Kyiv 01054, Ukraine
| | - Artem Pastukhov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str., Kyiv 01054, Ukraine
| | - Marina Dudarenko
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str., Kyiv 01054, Ukraine
| | - Oleg Shatursky
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str., Kyiv 01054, Ukraine
| | - Olena Gnatyuk
- The Department of Physics of biological systems, Institute of Physics, NAS of Ukraine, 46 Nauky Ave., Kyiv 03680, Ukraine
| | - Uliana Afonina
- The Department of Physics of biological systems, Institute of Physics, NAS of Ukraine, 46 Nauky Ave., Kyiv 03680, Ukraine
| | - Kyrylo Pyrshev
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str., Kyiv 01054, Ukraine
| | - Galina Dovbeshko
- The Department of Physics of biological systems, Institute of Physics, NAS of Ukraine, 46 Nauky Ave., Kyiv 03680, Ukraine
| | - Semen Yesylevskyy
- The Department of Physics of biological systems, Institute of Physics, NAS of Ukraine, 46 Nauky Ave., Kyiv 03680, Ukraine; Laboratoire Chrono Environnement UMR CNRS 6249, Université de Bourgogne Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France
| | - Tatiana Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str., Kyiv 01054, Ukraine.
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Pozdnyakova N, Krisanova N, Pastukhov A, Tarasenko A, Dudarenko M, Chernykh A, Pashenko A, Ryabukhin S, Tolstanova G, Volochnyuk D, Borisova T. Neuromodulation by selective angiotensin-converting enzyme 2 inhibitors. Neuroscience 2022; 498:155-173. [PMID: 35817218 DOI: 10.1016/j.neuroscience.2022.07.003] [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: 04/30/2022] [Revised: 06/23/2022] [Accepted: 07/02/2022] [Indexed: 11/25/2022]
Abstract
Here, neuromodulatory effects of selective angiotensin-converting enzyme 2 (ACE2) inhibitors were investigated. Two different types of small molecule ligands for ACE2 inhibition were selected using chemical genetic approach, they were synthesized using developed chemical method and tested using presynaptic rat brain nerve terminals (synaptosomes). EBC-36032 (1 µM) increased in a dose-dependent manner spontaneous and stimulated ROS generation in nerve terminals that was of non-mitochondrial origin. Another inhibitor EBC-36033 (MLN-4760) was inert regarding modulation of ROS generation. EBC-36032 and EBC-36033 (100 µM) did not modulate the exocytotic release of L-[14C]glutamate, whereas both inhibitors decreased the initial rate of uptake, but not accumulation (10 min) of L-[14C]glutamate by nerve terminals. EBC-36032 (100 µM) decreased the exocytotic release as well as the initial rate and accumulation of [3H]GABA by nerve terminals. EBC-36032 and EBC-36033 did not change the extracellular levels and transporter-mediated release of [3H]GABA and L-[14C]glutamate, and tonic leakage of [3H]GABA from nerve terminals. Therefore, synthesized selective ACE2 inhibitors decreased uptake of glutamate and GABA as well as exocytosis of GABA at the presynaptic level. The initial rate of glutamate uptake was the only parameter that was mitigated by both ACE2 inhibitors despite stereochemistry issues. In terms of ACE2-targeted antiviral/anti-SARS-CoV-2 and other therapies, novel ACE2 inhibitors should be checked on the subject of possible renin-angiotensin system (RAS)-independent neurological side effects.
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Affiliation(s)
- Natalia Pozdnyakova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kyiv 01054, Ukraine
| | - Natalia Krisanova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kyiv 01054, Ukraine
| | - Artem Pastukhov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kyiv 01054, Ukraine
| | - Alla Tarasenko
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kyiv 01054, Ukraine
| | - Marina Dudarenko
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kyiv 01054, Ukraine
| | - Anton Chernykh
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska Street, Kyiv 01033, Ukraine; Enamine Ltd, 78 Chervonotkatska Street, Kyiv 02094, Ukraine
| | - Alexander Pashenko
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska Street, Kyiv 01033, Ukraine; Enamine Ltd, 78 Chervonotkatska Street, Kyiv 02094, Ukraine
| | - Sergey Ryabukhin
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska Street, Kyiv 01033, Ukraine; Enamine Ltd, 78 Chervonotkatska Street, Kyiv 02094, Ukraine
| | - Ganna Tolstanova
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska Street, Kyiv 01033, Ukraine
| | - Dmitriy Volochnyuk
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska Street, Kyiv 01033, Ukraine; Enamine Ltd, 78 Chervonotkatska Street, Kyiv 02094, Ukraine; Institute of Organic Chemistry, National Academy of Sciences of Ukraine, 5 Murmanska Street, Kyiv 02094, Ukraine
| | - Tatiana Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kyiv 01054, Ukraine.
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5
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Tarasenko A, Pozdnyakova N, Paliienko K, Borysov A, Krisanova N, Pastukhov A, Stanovyi O, Gnatyuk O, Dovbeshko G, Borisova T. A comparative study of wood sawdust and plastic smoke particulate matter with a focus on spectroscopic, fluorescent, oxidative, and neuroactive properties. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:38315-38330. [PMID: 35079971 PMCID: PMC8789210 DOI: 10.1007/s11356-022-18741-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 01/14/2022] [Indexed: 06/14/2023]
Abstract
Here, water-suspended smoke aerosol preparation was synthesized from biomass-based fuel, i.e., a widespread product for residential heating, wood sawdust (WP) (pine, poplar, and birch mixture), and its properties were compared in parallel experiments with the smoke preparation from plastics (PP). Molecular groups in the PM preparations were analyzed using Raman and Fourier-transform infrared spectroscopy. WP was assessed in neurotoxicity studies using rat cortex nerve terminals (synaptosomes). Generation of spontaneous and H2O2-evoked reactive oxygen species (ROS) detected using fluorescent dye 2',7'-dichlorofluorescein in nerve terminals was decreased by WP. In comparison with PP, WP demonstrated more pronounced reduction of spontaneous and H2O2-evoked ROS production. WP completely inhibited glutamate receptor agonist kainate-induced ROS production, thereby affecting the glutamate receptor-mediated signaling pathways. WP decreased the synaptosomal membrane potential in fluorimetric experiments and the synaptosomal transporter-mediated uptake of excitatory and inhibitory neurotransmitters, L-[14C]glutamate and [3H] γ-aminobutyric acid (GABA), respectively. PP decreased the ambient synaptosomal level of [3H]GABA, whereas it did not change that of L-[14C]glutamate. Principal difference between WP and PP was found in their ability to influence the ambient synaptosomal level of [3H]GABA (an increase and decrease, respectively), thereby showing riskiness in mitigation of synaptic inhibition by PP and triggering development of neuropathology.
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Affiliation(s)
- Alla Tarasenko
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha str, Kiev, 01054, Ukraine
| | - Natalia Pozdnyakova
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha str, Kiev, 01054, Ukraine
| | - Konstantin Paliienko
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha str, Kiev, 01054, Ukraine
| | - Arsenii Borysov
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha str, Kiev, 01054, Ukraine
| | - Natalia Krisanova
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha str, Kiev, 01054, Ukraine
| | - Artem Pastukhov
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha str, Kiev, 01054, Ukraine
| | - Olexander Stanovyi
- Department of Physics of Biological Systems, Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauky Ave, Kiev, 03680, Ukraine
| | - Olena Gnatyuk
- Department of Physics of Biological Systems, Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauky Ave, Kiev, 03680, Ukraine
| | - Galina Dovbeshko
- Department of Physics of Biological Systems, Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauky Ave, Kiev, 03680, Ukraine
| | - Tatiana Borisova
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha str, Kiev, 01054, Ukraine
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Borisova T, Pozdnyakova N, Dudarenko M, Krisanova N, Andronati S. GABAA receptor agonist cinazepam and its active metabolite 3-hydroxyphenazepam act differently at the presynaptic site. Eur Neuropsychopharmacol 2021; 45:39-51. [PMID: 33820715 DOI: 10.1016/j.euroneuro.2021.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/11/2021] [Accepted: 03/15/2021] [Indexed: 10/21/2022]
Abstract
Cinazepam C19H14BrClN2O5, ("LevanaⓇ ІC") a partial GABAA receptor agonist, and its active metabolite 3-hydroxyphenazepam C15H10BrClN2O2 were comparatively assessed in vitro using nerve terminals isolated from rat cortex (synaptosomes). At the presynaptic site, cinazepam (100 and 200 µM) facilitated synaptosomal transporter-mediated [3H]GABA uptake by enhancing both the initial rate and accumulation, and decreased the ambient level and transporter-mediated release of [3H]GABA. Whereas, 3-hydroxyphenazepam decreased the uptake and did not change the ambient synaptosomal level and transporter-mediated release of [3H]GABA. To exclude GABA transporter influence, NO-711, the transporter blocker, was applied and it was found that exocytotic release of [3H]GABA decreased, whereas tonic release of [3H]GABA was not changed in the presence of both cinazepam or 3-hydroxyphenazepam after treatment of synaptosomes with NO-711. In fluorimetric studies using potential- and pH-sensitive dyes rhodamine 6G and acridine orange, respectively, it was found that cinazepam hyperpolarized the synaptosomal plasma membrane, and increased synaptic vesicle acidification, whereas, 3-hydroxyphenazepam demonstrated opposite effects on these parameters. Therefore, action of cinazepam and its active metabolite 3-hydroxyphenazepam on GABAergic neurotransmission was different. Therapeutic effects of cinazepam can be associated with its ability to hyperpolarize the plasma membrane, to increase synaptic vesicle acidification and capacity of its active metabolite 3-hydroxyphenazepam to inhibit GABA transporter functioning.
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Affiliation(s)
- Tatiana Borisova
- The Department of Neurochemistry, The Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev 01054, Ukraine.
| | - Natalia Pozdnyakova
- The Department of Neurochemistry, The Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev 01054, Ukraine.
| | - Marina Dudarenko
- The Department of Neurochemistry, The Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev 01054, Ukraine.
| | - Natalia Krisanova
- The Department of Neurochemistry, The Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev 01054, Ukraine.
| | - Sergey Andronati
- The Department of Medicinal Chemistry, A.V. Bogatsky Physico-Chemical Institute of the National Academy of Sciences of Ukraine, 86 Lustdorfskaya doroga, 65080 Odessa, Ukraine.
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Sünnetçi E, Solmaz V, Erbaş O. Chronic Oxytocin treatment has long lasting therapeutic potential in a rat model of neonatal hypercapnic-hypoxia injury, through enhanced GABAergic signaling and by reducing hippocampal gliosis with its anti-inflammatory feature. Peptides 2021; 135:170398. [PMID: 33022295 DOI: 10.1016/j.peptides.2020.170398] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 08/25/2020] [Accepted: 08/27/2020] [Indexed: 12/31/2022]
Abstract
Previous studies have shown that, oxytocin has anticonvulsant and neuroprotective effects. One of the most important complications of Hypercapnic-hypoxia is drug resistance epilepsy. Effects of chronic intraperitoneal oxytocin treatment on gliosis, neuroinflammation and seizure activity was investigated in a model in which rats were exposed to hypoxia on postnatal day 1 and later challenged to the seizure-inducing pentylenetetrazol Forty pups were included in the study on their first day of birth. 16 pups were exposed to 100% CO2 for 5 minutes and other 16 pups for 10 minutes. The remaining 8 pups comprised the control group. Groups were classified according to oxytocin administration within the first 4 weeks. Pentylenetetrazol was administered 6 months after the oxytocin treatment. The Racine's Convulsion Scale and onset times of first myoclonic jerk (FMJ) were evaluated. To determine the mechanisms by which oxytocin exerted its effects on hypercapnic-anoxia exposed rats, we performed CA1 total neuron count & CA1 GFAP immunostaining, and measured brain levels of TNF-α and GAD-67. The Racine scale and TNF-α values were significantly lower in both groups that received oxytocin, while time-to-FMJ and GAD-67 level were significantly higher. The histopathological evaluations showed that oxytocin had significant ameliorative effects (especially regarding gliosis) on the hippocampus of hypoxic rats. Regarding the results of present study, it can be speculated that after acute hypercapnic-anoxia exposure, chronic Oxytocin treatment has long lasting therapeutic potential on rats, possibly by reducing the gliosis with its anti-inflammatory feature and by activating the GABA pathway.
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Affiliation(s)
- Eda Sünnetçi
- Istanbul Training and Education Hospital, Department of Pediatrics, Istanbul, Turkey
| | - Volkan Solmaz
- Memorial hizmet hospital, neurology clinic, Istanbul, Turkey.
| | - Oytun Erbaş
- Demiroğlu Bilim University Medical School, Department of Physiology, İstanbul, Turkey
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Pozdnyakova N, Krisanova N, Dudarenko M, Vavers E, Zvejniece L, Dambrova M, Borisova T. Inhibition of sigma-1 receptors substantially modulates GABA and glutamate transport in presynaptic nerve terminals. Exp Neurol 2020; 333:113434. [PMID: 32795464 DOI: 10.1016/j.expneurol.2020.113434] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 07/07/2020] [Accepted: 08/06/2020] [Indexed: 12/22/2022]
Abstract
Sigma-1 receptors (Sig-1Rs) have been implicated in many neurological and psychiatric disorders and are a novel target for the treatment of such disorders. Sig-1R expression/activity deficits are linked to neurodegeneration, whereas the mechanisms mediated by Sig-1R are still unclear. Here, presynaptic [3H]GABA and L-[14C]glutamate transport was analysed in rat brain nerve terminals (synaptosomes) in the presence of the Sig-1R antagonist NE-100. NE-100 at doses of 1 and 10 μM increased the initial rate of synaptosomal [3H]GABA uptake, whereas 50 and 100 μM NE-100 decreased this rate, exerting a biphasic mode of action.Antagonists of GABAA and GABAB receptors, flumazenil and saclofen, respectively, prevented an increase in [3H]GABA uptake caused by 10 μM NE-100. L-[14C]glutamate uptake was decreased by 10-100 μM NE-100. A decrease in the uptake of both neurotransmitters mediated by NE-100 (50-100 μM) may have resulted from simultaneous antagonist-induced membrane depolarization, which was measured using the potential-sensitive fluorescent dye rhodamine 6G. The extracellular level of [3H]GABA was decreased by 1-10 μM NE-100, but that of L-[14C]glutamate remained unchanged. The tonic release of [3H]GABA measured in the presence of NO-711 was not changed by the antagonist, suggesting that NE-100 did not disrupt membrane integrity. The KCl- and FCCP-induced transporter-mediated release of L-[14C]glutamate was decreased by the antagonist; this may underlie the neuroprotective action of the antagonist in hypoxia/ischaemia. NE-100 (10-100 μM) decreased the KCl-evoked exocytotic release of [3H]GABA and L-[14C]glutamate, whereas the induction of the release of both neurotransmitters by the Ca2+ ionophore ionomycin was not affected by the antagonist; therefore, the mitigation of KCl-evoked exocytosis was associated with the NE-100-induced dysfunction of potential-dependent Ca2+ channels. Therefore, the Sig-1R antagonist can specifically act in an acute manner at the presynaptic level through the modulation of GABA and glutamate uptake, transporter-mediated release and exocytosis.
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Affiliation(s)
- Natalia Pozdnyakova
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, 01030 Kiev, Ukraine
| | - Natalia Krisanova
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, 01030 Kiev, Ukraine
| | - Marina Dudarenko
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, 01030 Kiev, Ukraine
| | - Edijs Vavers
- Latvian Institute of Organic Synthesis, Aizkraukles Str, 21, Riga LV1006, Latvia
| | - Liga Zvejniece
- Latvian Institute of Organic Synthesis, Aizkraukles Str, 21, Riga LV1006, Latvia
| | - Maija Dambrova
- Latvian Institute of Organic Synthesis, Aizkraukles Str, 21, Riga LV1006, Latvia
| | - Tatiana Borisova
- Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, 01030 Kiev, Ukraine.
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The vulnerability of the immature brain. HANDBOOK OF CLINICAL NEUROLOGY 2020. [PMID: 32958197 DOI: 10.1016/b978-0-444-64150-2.00010-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
The concept of vulnerability of the immature brain is multifactorial by definition. Newer scientific work in this area has shifted and enlarged the concept from theoretical frameworks to the multiple levels (molecular, cellular, anatomic, network, behavioral) of the organization of the growing brain. The concept of vulnerability was first introduced by Donald O. Hebb in the 1950s and referred to the inability of the immature brain to completely recover normal development after a brain insult. The concept of vulnerability was further extended to the limitations of the brain in the development of specific skills in neuronal substrates originally used for other functions. We present an overview of some neurodevelopmental processes that characterize the immature brain and that can predict vulnerability in the case of disturbances: Hebb's principle, synaptic homeostasis, selective vulnerability of immature cells in mammals, and inherited constraint networks. A better understanding of the vulnerability mechanisms may help in early detection and prevention and further proposed individualized therapeutic approaches to enhance children's developmental outcomes.
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Pozdnyakova N, Dudarenko M, Borisova T. Age-Dependency of Levetiracetam Effects on Exocytotic GABA Release from Nerve Terminals in the Hippocampus and Cortex in Norm and After Perinatal Hypoxia. Cell Mol Neurobiol 2019; 39:701-714. [PMID: 31006090 DOI: 10.1007/s10571-019-00676-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 04/10/2019] [Indexed: 10/27/2022]
Abstract
Perinatal hypoxia can lead to multiple chronic neurological deficits, e.g., mental retardation, behavioral abnormalities, and epilepsy. Levetiracetam (LEV), 2S-(2-oxo-1-pyrrolidiny1) butanamide, is an anticonvulsant drug with proven efficiency in treating patients with focal and generalized seizures. Rats were underwent hypoxia and seizures at the age of 10-12 postnatal days (pd). The ambient level and depolarization-induced exocytotic release of [3H]GABA (γ-aminobutyric acid) were analyzed in nerve terminals in the hippocampus and cortex during development at the age of pd 17-19 and pd 24-26 (infantile stage), pd 38-40 (puberty) and pd 66-73 (young adults) in norm and after perinatal hypoxia. LEV had no effects on the ambient [3H]GABA level. The latter increased during development and was further elevated after perinatal hypoxia in nerve terminals in the hippocampus during the whole period and in the cortex in young adults. Exocytotic [3H]GABA release from nerve terminals increased after perinatal hypoxia during development in the hippocampus and cortex, however this effect was preserved at all ages during blockage of GABA transporters by NO-711 in the hippocampus only. LEV realized its anticonvulsant effects at the presynaptic site through an increase in exocytotic release of GABA. LEV exerted more significant effect after perinatal hypoxia than in norm. Action of LEV was strongly age-dependent and can be registered in puberty and young adults, but the drug was inert at the infantile stage.
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Affiliation(s)
- Natalia Pozdnyakova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kiev, 01030, Ukraine
| | - Marina Dudarenko
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kiev, 01030, Ukraine
| | - Tatiana Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Str, Kiev, 01030, Ukraine.
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