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Yakovlev AV, Kurmashova E, Gataulina E, Gerasimova E, Khalilov I, Sitdikova GF. Maternal hyperhomocysteinemia increases seizures susceptibility of neonatal rats. Life Sci 2023; 329:121953. [PMID: 37467884 DOI: 10.1016/j.lfs.2023.121953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/13/2023] [Accepted: 07/14/2023] [Indexed: 07/21/2023]
Abstract
AIMS Neonatal seizures are severe pathologies which may result in long-term neurological consequences. High plasma concentrations of homocysteine - hyperhomocysteinemia (hHCy) - are associated with epilepsy. In the present study, we evaluated susceptibility to seizure of neonatal rats with prenatal hHCy. MAIN METHODS Prenatal hHCy was induced by feeding females with a high-methionine diet. Experiments were performed on pups during the first three postnatal weeks. Flurothyl-induced epileptic behavior was assessed according to Racine's scale. Epileptiform activity in the hippocampus was recorded using electrophysiological methods. The balance of excitation/inhibition, functional GABAergic inhibition and GABA reversal potential in hippocampal neurons were analyzed. KEY FINDINGS Rats with hHCy developed more severe stages of behavioral patterns during flurothyl-induced epilepsy with shorter latency. Electrophysiological recordings demonstrated higher background neuronal activity in rats with hHCy. Seizure-like events triggered by flurothyl (in vivo) or 4-aminopyridine (in vitro) showed shorter latency, higher power and amplitude. An increased glutamate/GABA synaptic ratio was shown in the pyramidal neurons of rats with hHCy and more slices demonstrated excitation by isoguvacine, a selective GABA(A) receptor agonist, during the first and second postnatal weeks. The GABA driving force and the reversal potential of GABA(A) currents were more positive during the second postnatal week for hHCy rats. SIGNIFICANCE The higher susceptibility to seizures in rats with prenatal hHCy due to a shift in the balance of excitation/inhibition toward excitation may underlie the clinical evidence about the association of hHCy with an increased risk of epilepsy.
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Affiliation(s)
- A V Yakovlev
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya str 18, Kazan 420008, Russia.
| | - E Kurmashova
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya str 18, Kazan 420008, Russia
| | - E Gataulina
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya str 18, Kazan 420008, Russia
| | - E Gerasimova
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya str 18, Kazan 420008, Russia
| | - I Khalilov
- Institut de Neurobiologie de la Méditerranée, INMED UMR901 Parc scientifique de Luminy, 163 avenue de Luminy BP13 - 13273, Marseille cedex 09, France; Laboratory of Neurobiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya str 18, Kazan 420008, Russia
| | - G F Sitdikova
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya str 18, Kazan 420008, Russia
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Yakovlev AV, Dmitrieva SA, Krasnova AN, Yakovleva OV, Sitdikova GF. Levels of Protein Carbonylation and Activity of Proteases in the Brain of Newborn Rats with Prenatal Hyperhomocysteinemia. NEUROCHEM J+ 2022. [DOI: 10.1134/s181971242203014x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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3
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Koroleva KS, Svitko SO, Nurmieva DA, Gafurov OS, Buglinina AD, Sitdikova GF. Effects of Nitric Oxide on the Electrical Activity of the Rat Trigeminal Nerve and Mast Cell Morphology. J EVOL BIOCHEM PHYS+ 2022. [DOI: 10.1134/s0022093022030243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Shaidullov IF, Shafigullin MU, Gabitova LM, Sitdikov FG, Zefirov AL, Sitdikova GF. Erratum to: Role of Potassium Channels in the Effects of Hydrogen Sulfide on Contractility of Gastric Smooth Muscle Cells in Rats. J EVOL BIOCHEM PHYS+ 2019. [DOI: 10.1134/s0022093019010113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Blokhina AS, Khaertdinov NN, Zefirov AL, Sitdikova GF. Interaction between Hydrogen Sulfide and Muscarinic Receptors in the Regulation of Contractility of the Mouse Atrium. NEUROCHEM J+ 2018. [DOI: 10.1134/s1819712418040025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Shaidullov IF, Shafigullin MU, Gabitova LM, Sitdikov FG, Zefirov AL, Sitdikova GF. Role of Potassium Channels in the Effects of Hydrogen Sulfide on Contractility of Gastric Smooth Muscle Cells in Rats. J EVOL BIOCHEM PHYS+ 2018. [DOI: 10.1134/s0022093018050083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yakovleva OV, Zakharov AV, Zefirov AL, Sitdikova GF. Analysis of exo- and endocytosis in the mouse nerve ending in experimental diabetes mellitus. Biochem Moscow Suppl Ser A 2017. [DOI: 10.1134/s199074781702009x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Gabitova DM, Shaidullov IF, Sabirullina GI, Shafigullin MU, Sitdikov FG, Sitdikova GF. Role of Cyclic Nucleotides in the Effect of Hydrogen Sulfide on Contractions of Rat Jejunum. Bull Exp Biol Med 2017; 163:14-17. [PMID: 28580487 DOI: 10.1007/s10517-017-3726-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Indexed: 01/17/2023]
Abstract
We studied the role of cyclic nucleotides in the influence of hydrogen sulfide (H2S) donor, sodium hydrosulfide (NaHS, 200 μM), on motor activity of rat jejunum. NaHS reduced spontaneous and carbachol-induced contractions of rat jejunum segment, which suggests that H2S can act through mechanisms involving muscarinic receptor activation. Against the background of a membrane-penetrating non-hydrolyzable cAMP analogue or under conditions of adenylate cyclase blockade, the inhibitory effect of NaHS on the carbachol-induced contractions was maintained. Against the background of elevated cGMP concentration or guanylate cyclase inhibition, the reduction of carbachol-induced contractions upon exposure to NaHS was less pronounced than in control. It was hypothesized that H2S induces relaxation of carbachol-induced jejunum contractions, affecting protein kinase G targets or activating cGMP synthesis.
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Affiliation(s)
- D M Gabitova
- Department of Human and Animal Physiology, Kazan, Russia.,Department of Human Health Protection, Kazan (Volga Region) Federal University, Kazan, Republic of Tatarstan, Russia
| | - I F Shaidullov
- Department of Human and Animal Physiology, Kazan, Russia.,Department of Human Health Protection, Kazan (Volga Region) Federal University, Kazan, Republic of Tatarstan, Russia
| | | | | | - F G Sitdikov
- Department of Human Health Protection, Kazan (Volga Region) Federal University, Kazan, Republic of Tatarstan, Russia
| | - G F Sitdikova
- Department of Human and Animal Physiology, Kazan, Russia.
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Mustafina AN, Koroleva KS, Giniatullin RA, Sitdikova GF. Acid Sensitive Ion Channels as Target of Hydrogen Sulfide in Rat Trigeminal Neurons. BioNanoSci 2016. [DOI: 10.1007/s12668-016-0237-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Lebedeva YA, Zakharova AV, Sitdikova GF, Zefirov AL, Khazipov RN. Ketamine-Midazolam Anesthesia Induces Total Inhibition of Cortical Activity in the Brain of Newborn Rats. Bull Exp Biol Med 2016; 161:15-9. [PMID: 27270941 DOI: 10.1007/s10517-016-3334-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Indexed: 11/25/2022]
Abstract
The effects of general anesthetics ketamine and midazolam, the drugs that cause neuroapoptosis at the early stages of CNS development, on electrical activity of the somatosensory cortex in newborn rats were studied using extracellular recording of local field potentials and action potentials of cortical neurons. Combined administration of ketamine (40 mg/kg) and midazolam (9 mg/kg) induced surgical coma and almost completely suppressed early oscillatory patterns and neuronal firing. These effects persisted over 3 h after injection of the anesthetics. We concluded that general anesthesia induced by combined administration of ketamine and midazolam profoundly suppressed cortical activity in newborn rats, which can trigger neuroapoptosis in the developing brain.
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Affiliation(s)
- Yu A Lebedeva
- Kazan (Volga Region) Federal University, Kazan, Russia.,Mediterranean Institute of Neurobiology (INMED), Marseille, France
| | - A V Zakharova
- Kazan (Volga Region) Federal University, Kazan, Russia.,Kazan State Medical University, Ministry of Health of the Russian Federation, Kazan, Tatarstan Republic, Russia
| | - G F Sitdikova
- Kazan (Volga Region) Federal University, Kazan, Russia
| | - A L Zefirov
- Kazan State Medical University, Ministry of Health of the Russian Federation, Kazan, Tatarstan Republic, Russia
| | - R N Khazipov
- Kazan (Volga Region) Federal University, Kazan, Russia. .,Mediterranean Institute of Neurobiology (INMED), Marseille, France. .,Aix-Marseille University, Marseille, France.
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Gerasimova EV, Zakharov AV, Lebedeva YA, Inacio AR, Minlebaev MG, Sitdikova GF, Khazipov RN. Gamma oscillations in the somatosensory cortex of newborn rats. Bull Exp Biol Med 2014; 156:295-8. [PMID: 24771360 DOI: 10.1007/s10517-014-2333-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Indexed: 01/13/2023]
Abstract
Here we addressed a question of whether gamma oscillations previously described in the whisker-related barrel cortex are a universal pattern of activity in the somatosensory cortex of newborn rats. Intracortical recording of local field potentials and action potentials in neurons using multisite silicon electrodes in 2-7-day-old rats showed that mechanical stimulation of single fingers or specific areas on the plantar or back side of the foot evoked early gamma oscillations followed by spindle-burst oscillations in the corresponding regions of the somatosensory cortex. Early gamma oscillations had maximum amplitude in layer IV of the somatosensory cortex and effectively synchronized action potentials in layer IV neurons. It was concluded that early gamma oscillations evoked by activation of the topographic sensory input are a universal activity pattern of the entire somatosensory cortex of newborn rats.
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Khalilov IA, Sitdikova GF, Khazipov RN, Zefirov AL. [Secondary epileptogenesis in the immature brain: a role of GABA]. Zh Nevrol Psikhiatr Im S S Korsakova 2014; 114:41-51. [PMID: 24874336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Clinical studies show that the probability of recurrent epileptiform discharges and formation of an epileptic focus (epileptogenesis) in young children is much higher than in adults. Repetitive epileptiform discharges and their potential contribution to the mechanisms of the development of the epileptic focus - an important object of clinical and scientific research. This review is based on the data from animal studies, and summarizes the current understanding of the mechanisms underlying the increased excitability of the immature brain, the formation of a secondary epileptogenic focus, and the functional changes of neurons due to deleterious effects of repetitive epileptiform discharges on the excitation and inhibition in the immature neuronal networks. The review discusses the relevance of experimental data in light of the general mechanisms of epileptogenesis in infants and identifies the gaps in current scientific knowledge, including the relationship between the data obtained in animal studies and processes underlying human acquired epilepsy.
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Affiliation(s)
- I A Khalilov
- Sredizemnomorskiĭ institut neĭrobiologii, Marsel', Frantsiia; Kazanskiĭ (Privolzhskiĭ) federal'nyĭ universitet, Kazan'
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Mitrukhina OB, Yakovlev AV, Sitdikova GF. The effects of hydrogen sulfide on the processes of exo- and endocytosis of synaptic vesicles in the mouse motor nerve endings. Biochem Moscow Suppl Ser A 2013. [DOI: 10.1134/s1990747812050121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yakovleva OV, Shafigullin MU, Sitdikova GF. The role of nitric oxide in the regulation of neurotransmitter release and processes of exo- and endocytosis of synaptic vesicles in mouse motor nerve endings. NEUROCHEM J+ 2013. [DOI: 10.1134/s1819712413020104] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Valiullina FF, Sitdikova GF. Effects and Mechanisms of Action of Nitric Oxide on Transmitter Release in Mouse Motor Nerve Terminals. NEUROPHYSIOLOGY+ 2012. [DOI: 10.1007/s11062-012-9324-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Sitdikova GF, Khaertdinov NN, Zefirov AL. Role of calcium and potassium channels in effects of hydrogen sulfide on frog myocardial contractility. Bull Exp Biol Med 2012; 151:163-6. [PMID: 22238741 DOI: 10.1007/s10517-011-1280-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The effects of sodium hydrosulfide NaHS, a donor of hydrogen sulfide H2S, on the force of muscle contraction were examined on isolated myocardial strips from frog ventricles. NaHS decreased the amplitude of muscle contractions in a dose-dependent manner under normal conditions and during inhibition of Ca channels with nifedipine. In contrast, under conditions of blockade of ATP-dependent potassium channels with glibenclamide, NaHS exerted a positive inotropic effect from the first minute of application. Neither blockade, nor activation of ATP-dependent K-channels with glibenclamide modulated the negative inotropic effect of NaHS. Inhibition of K-channels with tetraethylammonium (TEA) (3, 5, 10 mM) or 4-aminopyridine increased the amplitude of myocardial contractions. Preliminary application of 4-aminopyridine or TEA (3 mM) did not eliminate NaHS-induced negative inotropic effect, although higher TEA concentrations (5 or 10 mM) prevented it. The data indicate that the targets of H(2)S in frog myocardium are ATP-dependent, Ca-activated, and voltage-dependent K-channels.
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Affiliation(s)
- G F Sitdikova
- Department of Human and Animal Physiology, Kazan (Privolzhskii) Federal University, Russia.
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Sitdikova GF, Yakovlev AV, Odnoshivkina YG, Zefirov AL. Effects of hydrogen sulfide on the exo- and endocytosis of synaptic vesicles in frog motor nerve endings. NEUROCHEM J+ 2011. [DOI: 10.1134/s1819712411040155] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abramochkin DV, Haertdinov NN, Porokhnya MV, Zefirov AL, Sitdikova GF. Changes in the electrical and contractile activities of rat atrial myocardium caused by carbon monoxide. Dokl Biol Sci 2011; 439:187-90. [PMID: 21953218 DOI: 10.1134/s0012496611040053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Indexed: 11/22/2022]
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Sitdikova GF, Gerasimova EV, Khaertdinov NN, Zefirov AL. Role of cyclic nucleotides in effects of hydrogen sulfide on the mediator release in frog neuromuscular junction. NEUROCHEM J+ 2009. [DOI: 10.1134/s1819712409040072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zefirov AL, Zakharov AV, Mukhametzyanov RD, Petrov AM, Sitdikova GF. The vesicle cycle in motor nerve endings of the mouse diaphragm. ACTA ACUST UNITED AC 2009; 39:245-52. [PMID: 19234803 DOI: 10.1007/s11055-009-9122-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2007] [Indexed: 10/21/2022]
Abstract
Experiments on the mouse diaphragm muscle using intracellular microelectrode recordings and fluorescence microscopy were performed to study the dynamics of transmitter secretion and synaptic vesicle recycling processes (the exocytosis-endocytosis cycle) in motor nerve endings (NE) during prolonged rhythmic stimulation (20 impulses/sec). During stimulation, there were triphasic changes in the amplitude of endplate potentials (EPP): an initial rapid reduction, followed by prolonged (1-2 min) stabilization of amplitude, i.e., a plateau, and then a further slow decrease. Restoration of EPP amplitude after stimulation for 3 min occurred over a period of several seconds. Loading of synaptic vesicles with the fluorescent endocytic stain FM1-43 showed that rhythmic stimulation led to a gradual (over 5-6 min) decrease in NE fluorescence, demonstrating exocytosis of synaptic vesicles. Quantum analysis of the electrophysiological data and comparison of these data with results from fluorescence studies suggested that mouse NE have a high rate of endocytosis and reutilization of synaptic vesicles (the mean recycling time was about 50 sec), which may support the maintenance of reliable synaptic transmission during prolonged high-frequency activity. The sizes of the release-ready and recycling pools of synaptic vesicles were determined quantitatively. It is suggested that vesicle recycling in mouse NE occurs via a short, rapid pathway with incorporation into the recycling pool. Vesicles of the reserve pool are not used for transmitter secretion in the stimulation conditions used here.
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Affiliation(s)
- A L Zefirov
- Kazan State Medical University, 49 Butlerov Street, 420012, Kazan, Russia.
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Zefirov AL, Zakharov AV, Mukhametzianov RD, Petrov AM, Sitdikova GF. [Vesicle cycle in mouse diaphragm motor nerve terminals]. Ross Fiziol Zh Im I M Sechenova 2008; 94:129-141. [PMID: 18516844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In our research on mouse diaphragm muscles the dynamic of neurotransmitter secretion and synaptic vesicles recycling (exo-endocytosis cycle) at the long-term rhythmic stimulation (20Hz) are explored using an intracellular microelectrode registration and a fluorescent microscopy. It have been shown, thate change of end plant potentials (EPP) amplitude at the rhythmic training occurs in three phases: initial transient decrease, long amplitude stabilization (1-2 min)--the plateau and secondary slow decrease. After 3 minute stimulations the EPP amplitude recovery observed during several seconds. Loading the synaptic vesicle by fluorescent endocytic dye FM 1-43 had shown that the rhythmic stimulation results to gradual (during 5-6 mines) fluorescence decrease in NT, indicating the synaptic vesicle exocytosis. The quantum analysis of the electrophysiological data and their comparison to the fluorescent researches date has allowed to assume, that mouse motor nerve terminals are characterized by high rate of endocytosis and fast synaptic vesicle reuse (average recycling time about 50 sec) that can provide effective maintenance of synaptic transmission at long high-frequency activity. Sizes of ready releasable and recycling synaptic vesicle pools are quantitatively determined. It is assumed, that vesicle recycling occurs on a short fast way to inclusion in recycling pool. So, in the stimulation protocol that were used the synaptic vesicles from reserve pool remain unused. Thus in our conditions recycling pool vesicles cycle repeatedly without reserve pool release.
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Yakovleva OV, Sitdikova GF, Gerasimova EV, Zefirov AL. Fatty acids modulate transmitter release and functioning of potassium channels in motor nerve endings. NEUROCHEM J+ 2007. [DOI: 10.1134/s1819712407020067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sitdikova GF, Zefirov AL. [Gaseous messengers in the nervous system]. Ross Fiziol Zh Im I M Sechenova 2006; 92:872-82. [PMID: 17300044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Nitric oxide is the first gaseous messenger whose functions were comprehensively studied in different systems of organism. Recently, new data on the physiological role of other endogenous gases: carbon monoxide and hydrogen sulfide, appeared. The role of gases in gastrointestinal tract and cardiovascular system have been established; however, data on their function and mechanisms of action in nervous system are insufficient. This article highlights the current information on the role of gaseous messengers in central and peripheral nervous system.
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Arkhipova OV, Grishin SN, Sitdikova GF, Zefirov AL. The presynaptic effects of arachidonic acid and prostaglandin E2 at the frog neuromuscular junction. ACTA ACUST UNITED AC 2006; 36:307-12. [PMID: 16465498 DOI: 10.1007/s11055-006-0017-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2004] [Indexed: 12/21/2022]
Abstract
Arachidonic acid and prostaglandin E2 decreased the frequency of miniature endplate potentials with producing any changes in the their amplitude-time parameters. Arachidonic acid and prostaglandin E2 decreased the quantum composition of endplate currents and the amplitude of the third phase of the nerve ending response, which reflects currents though potential-dependent K+ channels. A perineural method was used to demonstrate that arachidonic acid and prostaglandin E2 suppressed the nerve ending Ca2+ current. The cyclooxygenase blocker indomethacin increased neurotransmitter secretion and decreased the third phase of the nerve ending response. The effects of arachidonic acid and prostaglandin E2 on evoked neurotransmitter release were not seen in the presence of indomethacin, while the third phase of the response continued to show a reduction. It is suggested that prostaglandin E2 mediates the effects of arachidonic acid on spontaneous and evoked neurotransmitter secretion, Ca2+ currents, and Ca2+ -dependent K+ currents. In addition, arachidonic acid and prostaglandin E2 had their own effects on potential-dependent K+ currents in nerve endings.
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Affiliation(s)
- O V Arkhipova
- Department of Human and Animals Physiology, Kazan' State University, 18 Kremlevskaya Street, 420008, Kazan', Russia
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Affiliation(s)
- G F Sitdikova
- Kazan State University, ul. Lenina 18, Kazan, 420008 Tatarstan, Russia
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Arkhipova OV, Grishin SN, Sitdikova GF, Zefirov AL. [Presynaptic effects of arachidonic acid and prostaglandin E2 in the frog neuromuscular synapse]. Ross Fiziol Zh Im I M Sechenova 2005; 91:268-76. [PMID: 15881878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Arachidonic acid and prostaglandin E2 decreased the frequency of miniature endplate currents without changing their amplitude-temporary parameters. They also reduced the evoked transmitter release and the amplitude of the 3rd phase of nerve ending response corresponding to the voltage-dependent K(+)-current. Using perineural recording, It was shown that arachidonic acid and prostaglandin E2 decreased the Ca2+ currents of nerve endings. Indometacin: inhibitor of cyclooxygenase, enhanced the evoked transmitter release and decreased the 3rd phase of nerve ending response. Indometacin prevented the effects of arachidonic acid on evoked transmitter release, whereas the effects of arachidonic acid on the 3rd phase was preserved. Prostaglandin E2 seems to mediate the effects of arachidonic acid on spontaneous and evoked transmitter release, Ca(2+)- and Ca(2+)-activated K(+)-currents. Moreover, the arachidonic acid and prostaglandin E2 exerted their own effects upon voltage-dependent potassium current of motor nerve ending.
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Sitdikova GF, Yakovlev AV, Zefirov AL, Arkhipova OV. The Effects of L- and D-Stereoisomers on the Transmitter Secretion and Ionic Currents in the Motor Nerve Ending. Doklady Biological Sciences 2003; 393:523-6. [PMID: 14994540 DOI: 10.1023/b:dobs.0000010313.65536.1f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- G F Sitdikova
- Kazan State University, ul. Lenina 18, Kazan, 420008 Tatarstan, Russia
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Zefirov AL, Grigor'ev PN, Petrov AM, Minlebaev MG, Sitdikova GF. [Analysis of living motor nerve ending of a frog by endocytotic fluorescent marker FM 1-43]. Tsitologiia 2003; 45:1163-71. [PMID: 15027348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
In our experiments on motor nerve endings of the frog cutaneous pectoris muscle, using fluorescent marker FM 1-43, the intensity and topography of endocytosis were investigated after the initiation of massive exocytosis of synaptic vesicles by increasing the extracellular potassium concentration. Using FM 1-43, fluorescent spots were shown to appear, looking as accumulations of synaptic vesicles in the active zone region. The forms and sizes of luminous spots and the distances between them were analysed. Considerable variations in brightness and total areas of fluorescent spots per a length unit in different regions of the nerve ending were revealed in addition to a proximal-distal gradient of these parameters along the nerve terminal. Peculiarities of topography and intensities of luminescence in the most terminal regions of the nerve ending are described. The obtained data are discussed in terms of the exo- and endocytosis cycle of synaptic vesicles in the active zone region, and from the point of view of the plasticity of the motor nerve ending and active zones. The factors involved in the transmitter release nonuniformity are analysed.
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Affiliation(s)
- A L Zefirov
- Department of Normal Physiology, Medical State University, Kazan.
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Zefirov AL, Sitdikova GF. [Ion channels in nerve ending]. Usp Fiziol Nauk 2002; 33:3-33. [PMID: 12449804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
Abstract
The modern data about the structure and function of the nerve ending ion channels are generalized and systematized. Ion channels of nerve endings provide the forming of the rest membrane potential, excitability, generation of action potential, regulate the intracellular concentration of calcium ions, take part in exocytosis of synaptic vesicules, participate in short-term and long-term synaptic plasticity, ensure the modulation of presynaptic functions. Methods of investigation of ion channels and data about their localization in central and peripheral nerve systems are represented. The review gives the functional characteristics, molecular structure and mechanisms of regulation of the known voltage- and ligand-dependent ion channels, the role of the certain types of ion channels in the machinery of transmitter release.
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Yakovlev AV, Sitdikova GF, Zefirov AL. NEUROPHYSIOLOGY+ 2002; 34:258-260. [DOI: 10.1023/a:1020704811861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Yakovlev AV, Sitdikova GF, Zefirov AL. Role of cyclic nucleotides in mediating the nitric oxide (II) effects on transmitter release and the electrogenesis of motor nerve endings. Dokl Biol Sci 2002; 382:11-4. [PMID: 11998746 DOI: 10.1023/a:1014461019764] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A V Yakovlev
- Kazan State University, ul. Kremlevskaya 18, Kazan, 420008 Russia
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Sitdikova GF, Shakiryanova DM, Zefirov AL. Effect of phenol on the ion currents of frog nerve ending. Mol Chem Neuropathol 1998; 33:259-66. [PMID: 9642678 DOI: 10.1007/bf02815187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of phenol on the transmitter release was studied at the neuromuscular junction of a frog cutaneous pectoris muscle using the extracellular microelectrode technique. It was shown that phenol (0.5 mM) enlarged the quantal content of the end-plate currents (EPCs), and it caused the increase of duration of the second negative and third positive phases of the triphasic response observed experimentally. The amplitude of the third phase (outward K+ current) decreased, and one of the second phase was unchanged. The effect of phenol remained in the presence of the Ca(2+)-channel blockers (Co2+, Mn2+), and disappeared in the presence of the tetraethylammonium (TEA) and 4-aminopyridine (4-AP). The results suggest that phenol changes the kinetics of the voltage-dependent K+ current, which is one of the mechanisms of the phenol facilitating effect at the synaptic transmission.
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Affiliation(s)
- G F Sitdikova
- Department of Human and Animals Physiology, State University, Kazan, Russia.
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Sitdikova GF, Khalilov IA, Zefirov AL. [The effect of phenol on the ion currents of the frog motor nerve ending]. Fiziol Zh Im I M Sechenova 1996; 82:78-84. [PMID: 9053092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Phenol was shown to enhance the quantum content of the end-plate currents and to increase the duration of the nerve ending response. The effect could be abolished by the potassium channel blockers. The data obtained suggest that alteration of the kinetics of the potential-dependent potassium current of the nerve terminal is one of the mechanisms of the phenol facilitating effect on neuro-muscular transmission.
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Khalilov IA, Sitdikova GF, Zefirov AL. Effects of pyrocatechol on neuromuscular transmission. NEUROPHYSIOLOGY+ 1995. [DOI: 10.1007/bf01053207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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