1
|
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: 2.0] [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.
Collapse
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
| |
Collapse
|
2
|
Kim G, Kim KS. Hypergravity-induced malfunction was moderated by the regulation of NMDA receptors in the vestibular nucleus. Sci Rep 2021; 11:17420. [PMID: 34465851 PMCID: PMC8408201 DOI: 10.1038/s41598-021-97050-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 08/20/2021] [Indexed: 12/03/2022] Open
Abstract
Gravity alteration is one of the critical environmental factors in the space, causing various abnormal behaviors related with the malfunctioned vestibular system. Due to the high plastic responses in the central vestibular system, the behavioral failures were resolved in a short period of time (in approx. 72 h). However, the plastic neurotransmission underlying the functional recovery is still elusive. To understand the neurotransmitter-induced plasticity under hypergravity, the extracellular single neuronal recording and the immunohistochemistry were conducted in the vestibular nucleus (VN). The animals were grouped as control, 24-h, 72-h, and 15-day exposing to 4G-hypergravity, and each group had two subgroups based on the origins of neuronal responses, such as canal and otolith. The averaged firing rates in VN showed no significant difference in the subgroups (canal-related: p > 0.105, otolith-related: p > 0.138). Meanwhile, the number of NMDAr was significantly changed by the exposing duration to hypergravity. The NMDAr decreased in 24 h (p = 1.048 × 10–9), and it was retrieved in 72 h and 15 days (p < 4.245 × 10–5). Apparently, the reduction and the retrieval in the number of NMDAr were synchronized with the generation and recovery of the abnormal behaviors. Thus, the plasticity to resolve the hypergravity-induced malfunctional behaviors was conducted by regulating the number of NMDAr.
Collapse
Affiliation(s)
- Gyutae Kim
- Research Institute for Aerospace Medicine, Inha University, Incheon, Korea.
| | - Kyu-Sung Kim
- Research Institute for Aerospace Medicine, Inha University, Incheon, Korea.,Department of Otolaryngology Head and Neck Surgery, Inha University Hospital, Incheon, Korea
| |
Collapse
|
3
|
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: 1.6] [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.
Collapse
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.
| |
Collapse
|
4
|
Lee J, Jang D, Jeong H, Kim KS, Yang S. Impairment of synaptic plasticity and novel object recognition in the hypergravity-exposed rats. Sci Rep 2020; 10:15813. [PMID: 32978417 PMCID: PMC7519067 DOI: 10.1038/s41598-020-72639-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 08/24/2020] [Indexed: 01/03/2023] Open
Abstract
The gravity is necessary for living organisms to operate various biological events including hippocampus-related functions of learning and memory. Until now, it remains inconclusive how altered gravity is associated with hippocampal functions. It is mainly due to the difficulties in generating an animal model experiencing altered gravity. Here, we demonstrate the effects of hypergravity on hippocampus-related functions using an animal behavior and electrophysiology with our hypergravity animal model. The hypergravity (4G, 4 weeks) group showed impaired synaptic efficacy and long-term potentiation in CA1 neurons of the hippocampus along with the poor performance of a novel object recognition task. Our studies suggest that altered gravity affects hippocampus-related cognitive functions, presumably through structural and functional adaptation to various conditions of gravity shift.
Collapse
Affiliation(s)
- Jinho Lee
- Department of Nano-Bioengineering, Incheon National University, Incheon, South Korea
| | - Doohyeong Jang
- Department of Nano-Bioengineering, Incheon National University, Incheon, South Korea
| | - Hyerin Jeong
- Department of Nano-Bioengineering, Incheon National University, Incheon, South Korea
| | - Kyu-Sung Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Inha University, College of Medicine, Incheon, South Korea. .,Inha Institute of Aerospace Medicine, Incheon, South Korea.
| | - Sunggu Yang
- Department of Nano-Bioengineering, Incheon National University, Incheon, South Korea.
| |
Collapse
|
5
|
Noh W, Lee M, Kim HJ, Kim KS, Yang S. Hypergravity induced disruption of cerebellar motor coordination. Sci Rep 2020; 10:4452. [PMID: 32157179 PMCID: PMC7064588 DOI: 10.1038/s41598-020-61453-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 02/21/2020] [Indexed: 01/23/2023] Open
Abstract
The cerebellum coordinates voluntary movements for balanced motor activity in a normal gravity condition. It remains unknown how hypergravity is associated with cerebellum-dependent motor behaviors and Purkinje cell’s activities. In order to investigate the relationship between gravity and cerebellar physiology, we measured AMPA-mediated fast currents and mGluR1-mediated slow currents of cerebellar Purkinje cells along with cerebellum-dependent behaviors such as the footprint and irregular ladder under a hypergravity condition. We found abnormal animal behaviors in the footprint and irregular ladder tests under hypergravity. They are correlated with decreased AMPA and mGluR1-mediated synaptic currents of Purkinje cells. These results indicate that gravity regulates the activity of Purkinje cells, thereby modulating cerebellum-dependent motor outputs.
Collapse
Affiliation(s)
- Wonjun Noh
- Department of Nano-Bioengineering, Incheon National University, Incheon, Korea
| | - Minseok Lee
- Department of Nano-Bioengineering, Incheon National University, Incheon, Korea
| | - Hyun Ji Kim
- Department of Otorhinolaryngology-Head & Neck surgery, Inha University, College of medicine, Incheon, Korea
| | - Kyu-Sung Kim
- Department of Otorhinolaryngology-Head & Neck surgery, Inha University, College of medicine, Incheon, Korea.
| | - Sunggu Yang
- Department of Nano-Bioengineering, Incheon National University, Incheon, Korea.
| |
Collapse
|
6
|
Borisova T, Kucherenko D, Soldatkin O, Kucherenko I, Pastukhov A, Nazarova A, Galkin M, Borysov A, Krisanova N, Soldatkin A, El Skaya A. An amperometric glutamate biosensor for monitoring glutamate release from brain nerve terminals and in blood plasma. Anal Chim Acta 2018; 1022:113-123. [PMID: 29729731 DOI: 10.1016/j.aca.2018.03.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 02/26/2018] [Accepted: 03/06/2018] [Indexed: 10/17/2022]
Abstract
An excess of the excitatory neurotransmitter, glutamate, in the synaptic cleft during hypoxia/ischemia provokes development of neurotoxicity and originates from the reversal of Na+-dependent glutamate transporters located in the plasma membrane of presynaptic brain nerve terminals. Here, we have optimized an electrochemical glutamate biosensor using glutamate oxidase and developed a biosensor-based methodological approach for analysis of rates of tonic, exocytotic and transporter-mediated glutamate release from isolated rat brain nerve terminals (synaptosomes). Changes in the extracellular glutamate concentrations from 11.5 ± 0.9 to 11.7 ± 0.9 μΜ for 6 min reflected a low tonic release of endogenous glutamate from nerve terminals. Depolarization-induced exocytotic release of endogenous glutamate was equal to 7.5 ± 1.0 μΜ and transporter reversal was 8.0 ± 1.0 μΜ for 6 min. The biosensor data correlated well with the results obtained using radiolabelled L-[14C]glutamate, spectrofluorimetric glutamate dehydrogenase and amino acid analyzer assays. The blood plasma glutamate concentration was also tested, and reliability of the biosensor measurements was confirmed by glutamate dehydrogenase assay. Therefore, the biosensor-based approach for accurate monitoring rates of tonic, exocytotic and transporter-mediated release of glutamate in nerve terminals was developed and its adequacy was confirmed by independent analytical methods. The biosensor measurements provided precise data on changes in the concentrations of endogenous glutamate in nerve terminals in response to stimulation. We consider that the glutamate biosensor-based approach can be applied in clinics for neuromonitoring glutamate-related parameters in brain samples, liquids and blood plasma in stroke, brain trauma, therapeutic hypothermia treatment, etc., and also in laboratory work to record glutamate release and uptake kinetics in nerve terminals.
Collapse
Affiliation(s)
- T Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv, 01601, Ukraine
| | - D Kucherenko
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo str., Kyiv, 03143, Ukraine; Institute of High Technologies, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., Kyiv, 01003, Ukraine
| | - O Soldatkin
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo str., Kyiv, 03143, Ukraine; Institute of High Technologies, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., Kyiv, 01003, Ukraine.
| | - I Kucherenko
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo str., Kyiv, 03143, Ukraine
| | - A Pastukhov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv, 01601, Ukraine
| | - A Nazarova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv, 01601, Ukraine
| | - M Galkin
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv, 01601, Ukraine
| | - A Borysov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv, 01601, Ukraine
| | - N Krisanova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv, 01601, Ukraine
| | - A Soldatkin
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo str., Kyiv, 03143, Ukraine; Institute of High Technologies, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., Kyiv, 01003, Ukraine
| | - A El Skaya
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo str., Kyiv, 03143, Ukraine
| |
Collapse
|
7
|
Pozdnyakova N. Consequences of perinatal hypoxia in developing brain: Changes in GABA transporter functioning in cortical, hippocampal and thalamic rat nerve terminals. Int J Dev Neurosci 2017; 63:1-7. [DOI: 10.1016/j.ijdevneu.2017.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 06/26/2017] [Accepted: 09/05/2017] [Indexed: 12/15/2022] Open
Affiliation(s)
- Natalia Pozdnyakova
- Department of NeurochemistryPalladin Institute of Biochemistry, National Academy of Sciences of UkraineLeontovicha Str. 9Kiev01030Ukraine
| |
Collapse
|
8
|
Sojka B, Kociołek D, Banski M, Borisova T, Pozdnyakova N, Pastukhov A, Borysov A, Dudarenko M, Podhorodecki A. Effects of surface functionalization of hydrophilic NaYF 4 nanocrystals doped with Eu 3+ on glutamate and GABA transport in brain synaptosomes. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2017; 19:275. [PMID: 28824289 PMCID: PMC5543196 DOI: 10.1007/s11051-017-3958-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 07/11/2017] [Indexed: 06/07/2023]
Abstract
Specific rare earth doped nanocrystals (NCs), a recent class of nanoparticles with fluorescent features, have great bioanalytical potential. Neuroactive properties of NaYF4 nanocrystals doped with Eu3+ were assessed based on the analysis of their effects on glutamate- and γ-aminobutyric acid (GABA) transport process in nerve terminals isolated from rat brain (synaptosomes). Two types of hydrophilic NCs were examined in this work: (i) coated by polyethylene glycol (PEG) and (ii) with OH groups at the surface. It was found that NaYF4:Eu3+-PEG and NaYF4:Eu3+-OH within the concentration range of 0.5-3.5 and 0.5-1.5 mg/ml, respectively, did not influence Na+-dependent transporter-dependent l-[14C]glutamate and [3H]GABA uptake and the ambient level of the neurotransmitters in the synaptosomes. An increase in NaYF4:Eu3+-PEG and NaYF4:Eu3+-OH concentrations up to 7.5 and 3.5 mg/ml, respectively, led to the (1) attenuation of the initial velocity of uptake of l-[14C]glutamate and [3H]GABA and (2) elevation of ambient neurotransmitters in the suspension of nerve terminals. In the mentioned concentrations, nanocrystals did not influence acidification of synaptic vesicles that was shown with pH-sensitive fluorescent dye acridine orange, however, decreased the potential of the plasma membrane of synaptosomes. In comparison with other nanoparticles studied with similar methodological approach, NCs start to exhibit their effects on neurotransmitter transport at concentrations several times higher than those shown for carbon dots, detonation nanodiamonds and an iron storage protein ferritin, whose activity can be registered at 0.08, 0.5 and 0.08 mg/ml, respectively. Therefore, NCs can be considered lesser neurotoxic as compared to above nanoparticles.
Collapse
Affiliation(s)
- Bartlomiej Sojka
- Department of Experimental Physics, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - Daria Kociołek
- Department of Experimental Physics, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - Mateusz Banski
- Department of Experimental Physics, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - Tatiana Borisova
- Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha str, Kiev, 01601 Ukraine
| | - Natalia Pozdnyakova
- Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha str, Kiev, 01601 Ukraine
| | - Artem Pastukhov
- Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha str, Kiev, 01601 Ukraine
| | - Arsenii Borysov
- Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha str, Kiev, 01601 Ukraine
| | - Marina Dudarenko
- Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha str, Kiev, 01601 Ukraine
| | - Artur Podhorodecki
- Department of Experimental Physics, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland
| |
Collapse
|
9
|
Horák D, Beneš M, Procházková Z, Trchová M, Borysov A, Pastukhov A, Paliienko K, Borisova T. Effect of O-methyl-β-cyclodextrin-modified magnetic nanoparticles on the uptake and extracellular level of l-glutamate in brain nerve terminals. Colloids Surf B Biointerfaces 2017; 149:64-71. [DOI: 10.1016/j.colsurfb.2016.10.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/20/2016] [Accepted: 10/04/2016] [Indexed: 11/29/2022]
|
10
|
Pastukhov A, Krisanova N, Maksymenko V, Borisova T. Personalized approach in brain protection by hypothermia: individual changes in non-pathological and ischemia-related glutamate transport in brain nerve terminals. EPMA J 2016; 7:26. [PMID: 27999623 PMCID: PMC5157095 DOI: 10.1186/s13167-016-0075-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 10/21/2016] [Indexed: 01/08/2023]
Abstract
BACKGROUND Both deep and profound hypothermia are effectively applied in cardiac surgery of the aortic arch, when the reduction of cerebral circulation facilitates operations, and for the prevention of ischemic stroke consequences. Neurochemical discrimination of the effects of deep and profound hypothermia (27 and 17 °C, respectively) on non-pathological and pathological ischemia-related mechanisms of presynaptic glutamate transport with its potential contribution to predictive, preventive and personalized medicine (PPPM) was performed. METHODS Experiments were conducted using nerve terminals isolated from rat cortex (synaptosomes). Glutamate transport in synaptosomes was analyzed using radiolabel l-[14C]glutamate. Diameter of synaptosomes was assessed by dynamic light scattering. RESULTS Synaptosomal transporter-mediated uptake and tonic release of l-[14C]glutamate (oppositely directed processes, dynamic balance of which determines the physiological extracellular level of the neurotransmitter) decreased in a different range in deep/profound hypothermia. As a result, hypothermia-induced changes in extracellular l-[14C]glutamate are not evident (in one half of animals it increased, and in other it decreased). A progressive decrease from deep to profound hypothermia was shown for pathological mechanisms of presynaptic glutamate transport, that is, transporter-mediated l-[14C]glutamate release (*) stimulated by depolarization of the plasma membrane and (**) during dissipation of the proton gradient of synaptic vesicles by the protonophore FCCP. CONCLUSIONS Therefore, the direction of hypothermia-induced changes in extracellular glutamate is unpredictable in "healthy" nerve terminals and depends on hypothermia sensitivity of uptake vs. tonic release. In affected nerve terminals (e.g., in brain regions suffering from a reduction of blood circulation during cardiac surgery, and core and penumbra zones of the insult), pathological transporter-mediated glutamate release from nerve terminals decreases with progressive significance from deep to profound hypothermia, thereby underlying its potent neuroprotective action. So, alterations in extracellular glutamate during hypothermia can be unique for each patient. An extent of a decrease in pathological glutamate transporter reversal depends on the size of damaged brain zone in each incident. Therefore, test parameters and clinical criteria of neuromonitoring for the evaluation of individual hypothermia-induced effects should be developed and delivered in practice in PPPM.
Collapse
Affiliation(s)
- Artem Pastukhov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str, Kyiv, 01601 Ukraine
| | - Natalia Krisanova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str, Kyiv, 01601 Ukraine
| | - Vitalii Maksymenko
- Amosov Institute of Cardiovascular Surgery of the Academy of Medical Sciences of Ukraine, 6 N. Amosov Str, Kyiv, 03110 Ukraine ; Faculty of Biomedical Engineering, National Technical University of Ukraine "KPI", 16/2 Yangel Str, Kyiv, 56 Ukraine
| | - Tatiana Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Str, Kyiv, 01601 Ukraine
| |
Collapse
|
11
|
Borisova T, Pozdnyakova N, Shaitanova E, Gerus I, Dudarenko M, Haufe G, Kukhar V. Effects of new fluorinated analogues of GABA, pregabalin bioisosters, on the ambient level and exocytotic release of [ 3H]GABA from rat brain nerve terminals. Bioorg Med Chem 2016; 25:759-764. [PMID: 27956036 DOI: 10.1016/j.bmc.2016.11.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 11/25/2016] [Accepted: 11/27/2016] [Indexed: 11/26/2022]
Abstract
Recently, we have shown that new fluorinated analogues of γ-aminobutyric acid (GABA), bioisosters of pregabalin (β-i-Bu-GABA), i.e. β-polyfluoroalkyl-GABAs (FGABAs), with substituents: β-CF3-β-OH (1), β-CF3 (2); β-CF2CF2H (3), are able to increase the initial rate of [3H]GABA uptake by isolated rat brain nerve terminals (synaptosomes), and this effect is higher than that of pregabalin. So, synthesized FGABAs are structural but not functional analogues of GABA. Herein, we assessed the effects of synthesized FGABAs (100μM) on the ambient level and exocytotic release of [3H]GABA in nerve terminals and compared with those of pregabalin (100μM). It was shown that FGABAs 1-3 did not influence the ambient level of [3H]GABA in the synaptosomal preparations, and this parameter was also not altered by pregabalin. During blockage of GABA transporters GAT1 by specific inhibitor NO-711, FGABAs and pregabalin also did not change ambient [3H]GABA in synaptosomal preparations. Exocytotic release of [3H]GABA from synaptosomes decreased in the presence of FGABAs 1-3 and pregabalin, and the effects of FGABAs 1 &3 were more significant than those of FGABAs 2 and pregabalin. FGABAs 1-3/pregabalin-induced decrease in exocytotic release of [3H]GABA from synaptosomes was not a result of changes in the potential of the plasma membrane. Therefore, new synthesized FGABAs 1 &3 were able to decrease exocytotic release of [3H]GABA from nerve terminals more effectively in comparison to pregabalin. Absence of unspecific side effects of FGABAs 1 &3 on the membrane potential makes these compounds perspective for medical application.
Collapse
Affiliation(s)
- T Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev 01601, Ukraine.
| | - N Pozdnyakova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev 01601, Ukraine.
| | - E Shaitanova
- The Department of Fine Organic Synthesis, Institute of Bioorganic Chemistry and Petrochemistry NAS of Ukraine, Murmanskaya Street. 1, Kiev 02094, Ukraine.
| | - I Gerus
- The Department of Fine Organic Synthesis, Institute of Bioorganic Chemistry and Petrochemistry NAS of Ukraine, Murmanskaya Street. 1, Kiev 02094, Ukraine.
| | - M Dudarenko
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev 01601, Ukraine.
| | - G Haufe
- Organic Chemistry Institute, Corrensstr. 40, D-48149 Münster, Germany.
| | - V Kukhar
- The Department of Fine Organic Synthesis, Institute of Bioorganic Chemistry and Petrochemistry NAS of Ukraine, Murmanskaya Street. 1, Kiev 02094, Ukraine.
| |
Collapse
|
12
|
Borisova T, Borysov A, Pastukhov A, Krisanova N. Dynamic Gradient of Glutamate Across the Membrane: Glutamate/Aspartate-Induced Changes in the Ambient Level of L-[ 14C]glutamate and D-[ 3H]aspartate in Rat Brain Nerve Terminals. Cell Mol Neurobiol 2016; 36:1229-1240. [PMID: 26886753 PMCID: PMC11706523 DOI: 10.1007/s10571-015-0321-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 12/21/2015] [Indexed: 12/11/2022]
Abstract
Extracellular/intracellular L-[14C]glutamate exchange and conservativeness of the extracellular level of L-[14C]glutamate was analyzed in isolated rat brain nerve terminals. L-Glutamate-, DL-threo-β-hydroxyaspartate (DL-THA)-, and D-aspartate-induced increase in the ambient level of L-[14C]glutamate or D-[3H]aspartate was evaluated comparatively. 100 μM "cold" nonradiolabeled L-glutamate, DL-THA, D-aspartate extruded a quarter of radioactivity from L-[14C]glutamate-preloaded synaptosomes for 6 min. The similar results were obtained with L-glutamate-evoked extracellular/intracellular redistribution of D-[3H]aspartate. Contribution of presynaptic glutamate receptors to an increase in the extracellular L-[14C]glutamate level was evaluated using receptor agonists NMDA, AMPA, and kainate (100 μM), and it consisted of less than 5 % of total accumulated label. The existence of the efficient extracellular/intracellular glutamate exchange, and so dynamic glutamate gradient across the plasma membrane of nerve terminals was demonstrated. A two-substrate kinetic algorithm that included transporter reversal was considered. The extracellular level of L-[14C]glutamate and D-[3H]aspartate in nerve terminals depended on the amount of exogenous substrates of glutamate transporter available. Taking into account that L-glutamate, DL-THA, and D-aspartate are the substrates of glutamate transporters, and also the similarity in their effectiveness in the establishment of new extracellular level of the neurotransmitters, the central role of glutamate transporters in permanent glutamate turnover in nerve terminals was demonstrated.
Collapse
Affiliation(s)
- T Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine.
| | - A Borysov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| | - A Pastukhov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| | - N Krisanova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| |
Collapse
|
13
|
Pozdnyakova N, Pastukhov A, Dudarenko M, Galkin M, Borysov A, Borisova T. Neuroactivity of detonation nanodiamonds: dose-dependent changes in transporter-mediated uptake and ambient level of excitatory/inhibitory neurotransmitters in brain nerve terminals. J Nanobiotechnology 2016; 14:25. [PMID: 27036406 PMCID: PMC4815169 DOI: 10.1186/s12951-016-0176-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 03/18/2016] [Indexed: 11/10/2022] Open
Abstract
Background Nanodiamonds are one of the most perspective nano-sized particles with superb physical and chemical properties, which are mainly composed of carbon sp3 structures in the core with sp2 and disorder/defect carbons on the surface. The research team recently demonstrated neuromodulatory properties of carbon nanodots with other than nanodiamonds hybridization types, i.e., sp2 hybridized graphene islands and diamond-like sp3 hybridized elements. Results In this study, neuroactive properties of uncoated nanodiamonds produced by detonation synthesis were assessed basing on their effects on transporter-mediated uptake and the ambient level of excitatory and inhibitory neurotransmitters, glutamate and γ-aminobutyric acid (GABA), in isolated rat brain nerve terminals. It was shown that nanodiamonds in a dose-dependent manner attenuated the initial velocity of Na+-dependent transporter-mediated uptake and accumulation of l-[14C]glutamate and [3H]GABA by nerve terminals and increased the ambient level of these neurotransmitters. Also, nanodiamonds caused a weak reduction in acidification of synaptic vesicles and depolarization of the plasma membrane of nerve terminals. Conclusions Therefore, despite different types of hybridization in nanodiamonds and carbon dots, they exhibit very similar effects on glutamate and GABA transport in nerve terminals and this common feature of both nanoparticles is presumably associated with their nanoscale size. Observed neuroactive properties of pure nanodiamonds can be used in neurotheranostics for simultaneous labeling/visualization of nerve terminals and modulation of key processes of glutamate- and GABAergic neurotransmission. In comparison with carbon dots, wider medical application involving hypo/hyperthermia, external magnetic fields, and radiolabel techniques can be perspective for nanodiamonds.
Collapse
Affiliation(s)
- Natalia Pozdnyakova
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| | - Artem Pastukhov
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| | - Marina Dudarenko
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| | - Maxim Galkin
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| | - Arsenii Borysov
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine
| | - Tatiana Borisova
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kiev, 01601, Ukraine.
| |
Collapse
|
14
|
Galkin MA, Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, Kyiv. COMPARATIVE STUDY OF THE EFFECTS OF DETONATION NANODIAMONDS WITH VARIED PROPERTIES ON FUNCTIONAL STATE OF BRAIN NERVE TERMINALS. BIOTECHNOLOGIA ACTA 2016. [DOI: 10.15407/biotech9.06.028] [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
|
15
|
Pozdnyakova N, Dudarenko M, Borisova T. New effects of GABAB receptor allosteric modulator rac-BHFF on ambient GABA, uptake/release, Em and synaptic vesicle acidification in nerve terminals. Neuroscience 2015. [DOI: 10.1016/j.neuroscience.2015.07.037] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
16
|
Borisova T, Pozdnyakova N, Shaitanova E, Gerus I, Dudarenko M, Mironets R, Haufe G, Kukhar V. Synthesis of new fluorinated analogs of GABA, Pregabalin bioisosteres, and their effects on [(3)H]GABA uptake by rat brain nerve terminals. Bioorg Med Chem 2015; 23:4316-4323. [PMID: 26138193 DOI: 10.1016/j.bmc.2015.06.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 06/08/2015] [Accepted: 06/11/2015] [Indexed: 10/23/2022]
Abstract
Fluorinated analogs of natural substances take an essential place in the design of new biologically active compounds. New fluorinated analogs of γ-aminobutyric acid, that is, β-polyfluoroalkyl-GABAs (FGABAs), were synthesized with substituents: β-CF3-β-OH (1), β-CF3 (2); β-CF2CF2H (3). FGABAs are bioisosteres of Pregabalin (Lyrica®, Pfizer's blockbuster drug, β-i-Bu-GABA), and have lipophilicity close to this medicine. The effects of synthesized FGABAs on [(3)H]GABA uptake by isolated rat brain nerve terminals (synaptosomes) were assessed and compared with those of Pregabalin. FGABAs 1-3 (100μM) did not influence the initial velocity of [(3)H]GABA uptake when applied acutely, whereas an increase in this parameter was found after preliminary incubation of FGABAs with synaptosomes. Pregabalin after preliminary incubation with synaptosomes caused unidirectional changes in the initial velocity of [(3)H]GABA uptake. Using specific inhibitors of GAT1 and GAT3, NO-711 and SNAP5114, respectively, the ability of FGABAs 1-3 to influence non-GAT1 and non-GAT3 uptake activity of nerve terminals was analyzed, but no specificity was found. Therefore, new synthesized FGABAs are structural but not functional analogs of GABA (because they did not inhibit synaptosomal [(3)H]GABA uptake). Moreover, FGABAs are able to increase the initial velocity of [(3)H]GABA uptake by synaptosomes, and this effect is higher than that of Pregabalin.
Collapse
Affiliation(s)
- T Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev 01601, Ukraine.
| | - N Pozdnyakova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev 01601, Ukraine
| | - E Shaitanova
- The Department of Fine Organic Synthesis, Institute of Bioorganic Chemistry and Petrochemistry, NAS of Ukraine, Murmanskaya Str. 1, Kiev 02094, Ukraine
| | - I Gerus
- The Department of Fine Organic Synthesis, Institute of Bioorganic Chemistry and Petrochemistry, NAS of Ukraine, Murmanskaya Str. 1, Kiev 02094, Ukraine
| | - M Dudarenko
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kiev 01601, Ukraine
| | - R Mironets
- The Department of Fine Organic Synthesis, Institute of Bioorganic Chemistry and Petrochemistry, NAS of Ukraine, Murmanskaya Str. 1, Kiev 02094, Ukraine
| | - G Haufe
- Organic Chemistry Institute, Corrensstr. 40, D-48149 Münster, Germany
| | - V Kukhar
- The Department of Fine Organic Synthesis, Institute of Bioorganic Chemistry and Petrochemistry, NAS of Ukraine, Murmanskaya Str. 1, Kiev 02094, Ukraine
| |
Collapse
|
17
|
Borisova T, Nazarova A, Dekaliuk M, Krisanova N, Pozdnyakova N, Borysov A, Sivko R, Demchenko AP. Neuromodulatory properties of fluorescent carbon dots: Effect on exocytotic release, uptake and ambient level of glutamate and GABA in brain nerve terminals. Int J Biochem Cell Biol 2015; 59:203-15. [DOI: 10.1016/j.biocel.2014.11.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 11/12/2014] [Accepted: 11/28/2014] [Indexed: 11/24/2022]
|
18
|
Soldatkin O, Nazarova A, Krisanova N, Borуsov A, Kucherenko D, Kucherenko I, Pozdnyakova N, Soldatkin A, Borisova T. Monitoring of the velocity of high-affinity glutamate uptake by isolated brain nerve terminals using amperometric glutamate biosensor. Talanta 2014; 135:67-74. [PMID: 25640127 DOI: 10.1016/j.talanta.2014.12.031] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 12/17/2014] [Accepted: 12/21/2014] [Indexed: 10/24/2022]
Abstract
Glutamate is the major excitatory neurotransmitter in the central nervous system, which is involved in the main aspects of normal brain functioning. High-affinity Na(+)-dependent glutamate transporters is key proteins, which transport extracellular glutamate to the cytoplasm of nerve cells, thereby preventing continuous activation of glutamate receptors, and thus the development of neurotoxicity. Disturbance in glutamate uptake is involved in the pathogenesis of major neurological disorders. Amperometric biosensors are the most promising and successful among electrochemical biosensors. In this study, we developed (1) amperometric glutamate biosensor, (2) methodological approach for the analysis of glutamate uptake in liquid samples of isolated rat brain nerve terminals (synaptosomes). The basal level of glutamate, the initial velocity of glutamate uptake and time-dependent accumulation of glutamate by synaptosomes were determined using developed glutamate biosensor. Comparative analysis of the data with those obtained by radioactive analysis, spectrofluorimetry and ion exchange chromatography was performed. Therefore, the methodological approach for monitoring of the velocity of glutamate uptake, which takes into consideration the definite level of endogenous glutamate in nerve terminals, was developed using glutamate biosensor.
Collapse
Affiliation(s)
- O Soldatkin
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo Str., Kyiv 03680, Ukraine.
| | - A Nazarova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv 01601, Ukraine
| | - N Krisanova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv 01601, Ukraine
| | - A Borуsov
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv 01601, Ukraine
| | - D Kucherenko
- Institute of High Technologies, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., Kyiv 01003, Ukraine
| | - I Kucherenko
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo Str., Kyiv 03680, Ukraine
| | - N Pozdnyakova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv 01601, Ukraine
| | - A Soldatkin
- Laboratory of Biomolecular Electronics, Department of Translation Mechanisms of Genetic Information, Institute of Molecular Biology and Genetics, NAS of Ukraine, 150 Zabolotnogo Str., Kyiv 03680, Ukraine; Institute of High Technologies, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., Kyiv 01003, Ukraine
| | - T Borisova
- The Department of Neurochemistry, Palladin Institute of Biochemistry, NAS of Ukraine, 9 Leontovicha Street, Kyiv 01601, Ukraine
| |
Collapse
|
19
|
Krisanova N, Kasatkina L, Sivko R, Borysov A, Nazarova A, Slenzka K, Borisova T. Neurotoxic potential of lunar and martian dust: influence on em, proton gradient, active transport, and binding of glutamate in rat brain nerve terminals. ASTROBIOLOGY 2013; 13:679-692. [PMID: 23919751 PMCID: PMC3746286 DOI: 10.1089/ast.2012.0950] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Accepted: 05/11/2013] [Indexed: 06/02/2023]
Abstract
The harmful effects of lunar dust (LD) on directly exposed tissues are documented in the literature, whereas researchers are only recently beginning to consider its effects on indirectly exposed tissues. During inhalation, nano-/microsized particles are efficiently deposited in nasal, tracheobronchial, and alveolar regions and transported to the central nervous system. The neurotoxic potential of LD and martian dust (MD) has not yet been assessed. Glutamate is the main excitatory neurotransmitter involved in most aspects of normal brain function, whereas disturbances in glutamate homeostasis contribute to the pathogenesis of major neurological disorders. The research was focused on the analysis of the effects of LD/MD simulants (JSC-1a/JSC, derived from volcanic ash) on the key characteristics of glutamatergic neurotransmission. The average size of LD and MD particles (even minor fractions) before and after sonication was determined by dynamic light scattering. With the use of radiolabeled l-[(14)C]glutamate, it was shown that there is an increase in l-[(14)C]glutamate binding to isolated rat brain nerve terminals (synaptosomes) in low [Na(+)] media and at low temperature in the presence of LD. MD caused significantly lesser changes under the same conditions, whereas nanoparticles of magnetite had no effect at all. Fluorimetric experiments with potential-sensitive dye rhodamine 6G and pH-sensitive dye acridine orange showed that the potential of the plasma membrane of the nerve terminals and acidification of synaptic vesicles were not altered by LD/MD (and nanoparticles of magnetite). Thus, the unique effect of LD to increase glutamate binding to the nerve terminals was shown. This can have deleterious effects on extracellular glutamate homeostasis in the central nervous system and cause alterations in the ambient level of glutamate, which is extremely important for proper synaptic transmission. During a long-term mission, a combination of constant irritation due to dust particles, inflammation, stress, low gravity and microgravity, radiation, UV, and so on may consequently change the effects of the dust and aggravate neurological consequences.
Collapse
Affiliation(s)
- Natalia Krisanova
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, Kiev, Ukraine
| | | | | | | | | | | | | |
Collapse
|
20
|
Synaptopathy under conditions of altered gravity: changes in synaptic vesicle fusion and glutamate release. Neurochem Int 2009; 55:724-31. [PMID: 19631248 DOI: 10.1016/j.neuint.2009.07.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Accepted: 07/14/2009] [Indexed: 11/22/2022]
Abstract
Glutamate release and synaptic vesicle heterotypic/homotypic fusion were characterized in brain synaptosomes of rats exposed to hypergravity (10 G, 1h). Stimulated vesicular exocytosis determined as KCl-evoked fluorescence spike of pH-sensitive dye acridine orange (AO) was decreased twice in synaptosomes under hypergravity conditions as compared to control. Sets of measurements demonstrated reduced ability of synaptic vesicles to accumulate AO ( approximately 10% higher steady-state baseline level of AO fluorescence). Experiments with preloaded l-[(14)C]glutamate exhibited similar amount of total glutamate accumulated by synaptosomes, equal concentration of ambient glutamate, but the enlarged level of cytoplasmic glutamate measuring as leakage from digitonin-permeabilized synaptosomes in hypergravity. Thus, it may be suggested that +G-induced changes in stimulated vesicular exocytosis were a result of the redistribution of intracellular pool of glutamate, i.e. a decrease in glutamate content of synaptic vesicles and an enrichment of the cytoplasmic glutamate level. To investigate the effect of hypergravity on the last step of exocytosis, i.e. membrane fusion, a cell-free system consisted of synaptic vesicles, plasma membrane vesicles, cytosolic proteins isolated from rat brain synaptosomes was used. It was found that hypergravity reduced the fusion competence of synaptic vesicles and plasma membrane vesicles, whereas synaptosomal cytosolic proteins became more active to promote membrane fusion. The total rate of homo- and heterotypic fusion reaction initiated by Ca(2+) or Mg(2+)/ATP remained unchanged under hypergravity conditions. Thus, hypergravity could induce synaptopathy that was associated with incomplete filling of synaptic vesicles with the neuromediator and changes in exocytotic release.
Collapse
|