1
|
Arkhipov AY, Fedorov NS, Nurullin LF, Khabibrakhmanov AN, Mukhamedyarov MA, Samigullin DV, Malomouzh AI. Activation of TRPV1 Channels Inhibits the Release of Acetylcholine and Improves Muscle Contractility in Mice. Cell Mol Neurobiol 2023; 43:4157-4172. [PMID: 37689594 DOI: 10.1007/s10571-023-01403-y] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 08/22/2023] [Indexed: 09/11/2023]
Abstract
TRPV1 represents a non-selective transient receptor potential cation channel found not only in sensory neurons, but also in motor nerve endings and in skeletal muscle fibers. However, the role of TRPV1 in the functioning of the neuromuscular junction has not yet been fully established. In this study, the Levator Auris Longus muscle preparations were used to assess the effect of pharmacological activation of TRPV1 channels on neuromuscular transmission. The presence of TRPV1 channels in the nerve terminal and in the muscle fiber was confirmed by immunohistochemistry. It was verified by electrophysiology that the TRPV1 channel agonist capsaicin inhibits the acetylcholine release, and this effect was completely absent after preliminary application of the TRPV1 channel blocker SB 366791. Nerve stimulation revealed an increase of amplitude of isometric tetanic contractions upon application of capsaicin which was also eliminated after preliminary application of SB 366791. Similar data were obtained during direct muscle stimulation. Thus, pharmacological activation of TRPV1 channels affects the functioning of both the pre- and postsynaptic compartment of the neuromuscular junction. A moderate decrease in the amount of acetylcholine released from the motor nerve allows to maintain a reserve pool of the mediator to ensure a longer signal transmission process, and an increase in the force of muscle contraction, in its turn, also implies more effective physiological muscle activity in response to prolonged stimulation. This assumption is supported by the fact that when muscle was indirect stimulated with a fatigue protocol, muscle fatigue was attenuated in the presence of capsaicin.
Collapse
Affiliation(s)
- Arsenii Y Arkhipov
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
| | - Nikita S Fedorov
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
- Kazan Federal University, 18 Kremlyovskaya Street, Kazan, Russia, 420008
| | - Leniz F Nurullin
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
- Kazan State Medical University, 49 Butlerova Street, Kazan, Russia, 420012
| | | | | | - Dmitry V Samigullin
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
- A.N. Tupolev Kazan National Research Technical University, 10, K. Marx Street, Kazan, Russia, 420111
| | - Artem I Malomouzh
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111.
- A.N. Tupolev Kazan National Research Technical University, 10, K. Marx Street, Kazan, Russia, 420111.
| |
Collapse
|
2
|
Mukhametshina AR, Fedorenko SV, Petrov AM, Zakyrjanova GF, Petrov KA, Nurullin LF, Nizameev IR, Mustafina AR, Sinyashin OG. Targeted Nanoparticles for Selective Marking of Neuromuscular Junctions and ex Vivo Monitoring of Endogenous Acetylcholine Hydrolysis. ACS Appl Mater Interfaces 2018; 10:14948-14955. [PMID: 29652477 DOI: 10.1021/acsami.8b04471] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The present work for the first time introduces nanosensors for luminescent monitoring of acetylcholinesterase (AChE)-catalyzed hydrolysis of endogenous acetylcholine (ACh) released in neuromuscular junctions of isolated muscles. The sensing function results from the quenching of Tb(III)-centered luminescence due to proton-induced degradation of luminescent Tb(III) complexes doped into silica nanoparticles (SNs, 23 nm), when acetic acid is produced from the enzymatic hydrolysis of ACh. The targeting of the silica nanoparticles by α-bungarotoxin was used for selective staining of the synaptic space in the isolated muscles by the nanosensors. The targeting procedure was optimized for the high sensing sensitivity. The measuring of the Tb(III)-centered luminescence intensity of the targeted SNs by fluorescent microscopy enables us to sense a release of endogenous ACh in neuromuscular junctions of the isolated muscles under their stimulation by a high-frequency train (20 Hz, for 3 min). The ability of the targeted SNs to sense an inhibiting effect of paraoxon on enzymatic activity of AChE in ex vivo conditions provides a way of mimicking external stimuli effects on enzymatic processes in the isolated muscles.
Collapse
Affiliation(s)
- Alsu R Mukhametshina
- Arbuzov Institute of Organic and Physical Chemistry , FRC Kazan Scientific Center of RAS , Arbuzov Str. 8 , 420088 Kazan , Russian Federation
| | - Svetlana V Fedorenko
- Arbuzov Institute of Organic and Physical Chemistry , FRC Kazan Scientific Center of RAS , Arbuzov Str. 8 , 420088 Kazan , Russian Federation
| | - Alexey M Petrov
- Kazan State Medial University , Butlerov Str. 49 , 420012 Kazan , Russian Federation
- Kazan Institute of Biochemistry and Biophysics , Federal Research Center "Kazan Scientific Center of RAS" , P.O. Box 30 , 420111 Kazan , Russian Federation
| | - Guzel F Zakyrjanova
- Kazan Institute of Biochemistry and Biophysics , Federal Research Center "Kazan Scientific Center of RAS" , P.O. Box 30 , 420111 Kazan , Russian Federation
| | - Konstantin A Petrov
- Arbuzov Institute of Organic and Physical Chemistry , FRC Kazan Scientific Center of RAS , Arbuzov Str. 8 , 420088 Kazan , Russian Federation
| | - Leniz F Nurullin
- Kazan Institute of Biochemistry and Biophysics , Federal Research Center "Kazan Scientific Center of RAS" , P.O. Box 30 , 420111 Kazan , Russian Federation
| | - Irek R Nizameev
- Arbuzov Institute of Organic and Physical Chemistry , FRC Kazan Scientific Center of RAS , Arbuzov Str. 8 , 420088 Kazan , Russian Federation
| | - Asiya R Mustafina
- Arbuzov Institute of Organic and Physical Chemistry , FRC Kazan Scientific Center of RAS , Arbuzov Str. 8 , 420088 Kazan , Russian Federation
| | - Oleg G Sinyashin
- Arbuzov Institute of Organic and Physical Chemistry , FRC Kazan Scientific Center of RAS , Arbuzov Str. 8 , 420088 Kazan , Russian Federation
| |
Collapse
|
3
|
Nurullin LF, Nikolsky EE, Malomouzh AI. Elements of molecular machinery of GABAergic signaling in the vertebrate cholinergic neuromuscular junction. Acta Histochem 2018; 120:298-301. [PMID: 29496267 DOI: 10.1016/j.acthis.2018.02.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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: 11/13/2017] [Revised: 01/19/2018] [Accepted: 02/14/2018] [Indexed: 11/17/2022]
Abstract
It is generally accepted that gamma-aminobutyric acid (GABA) is a signaling molecule abundant in central synapses. In a number of studies though, it has been shown that GABA signaling functions in the peripheral nervous system as well, in particular, in the synapses of sympathetic ganglia. However, there exists no firm evidence on the presence of GABAergic signaling cascade in the intercellular junctions of the somatic nerve system. By the use of immunohistochemistry methods, in the synaptic area of cholinergic neuromuscular contact in rat diaphragm, we have detected glutamate decarboxylase, the enzyme involved in synthesis of GABA, molecules of GABA, and also GAT-2, a protein responsible for transmembrane transport of GABA. Earlier we have also shown that metabotropic GABAB receptors have overlapping localization in the same compartment. Moreover, activation of GABAB receptors affects the intensity of acetylcholine release. These data taken together, allows us to suggest that in the mammalian cholinergic neuromuscular junction, GABA is synthesized and performs certain synaptic signaling function.
Collapse
Affiliation(s)
- Leniz F Nurullin
- Kazan Institute of Biochemistry and Biophysics, Subdivision of the Federal State Budgetary Institution of Science "Kazan Scientific Center of the Russian Academy of Sciences", P.O. Box 30, Kazan 420111, Russia; Kazan Medical University, 49 Butlerova St., Kazan 420012, Russia; Kazan Federal University, 18 Kremlyovskaya St., Kazan 420008, Russia
| | - Evgeny E Nikolsky
- Kazan Institute of Biochemistry and Biophysics, Subdivision of the Federal State Budgetary Institution of Science "Kazan Scientific Center of the Russian Academy of Sciences", P.O. Box 30, Kazan 420111, Russia; Kazan Medical University, 49 Butlerova St., Kazan 420012, Russia; Kazan Federal University, 18 Kremlyovskaya St., Kazan 420008, Russia
| | - Artem I Malomouzh
- Kazan Institute of Biochemistry and Biophysics, Subdivision of the Federal State Budgetary Institution of Science "Kazan Scientific Center of the Russian Academy of Sciences", P.O. Box 30, Kazan 420111, Russia; Kazan Federal University, 18 Kremlyovskaya St., Kazan 420008, Russia.
| |
Collapse
|
4
|
Tsentsevitsky AN, Kovyazina IV, Nurullin LF, Nikolsky EE. Muscarinic cholinoreceptors (M1-, M2-, M3- and M4-type) modulate the acetylcholine secretion in the frog neuromuscular junction. Neurosci Lett 2017; 649:62-69. [PMID: 28408330 DOI: 10.1016/j.neulet.2017.04.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 01/26/2017] [Revised: 03/23/2017] [Accepted: 04/07/2017] [Indexed: 11/28/2022]
Abstract
Muscarinic cholinoreceptors regulate the neurosecretion process in vertebrate neuromuscular junctions. The diversity of muscarinic effects on acetylcholine (ACh) secretion may be attributed to the different muscarinic subtypes involved in this process. In the present study, the location of five muscarinic receptor subtypes (M1, M2, M3, M4 and M5) on the motor nerve terminals of frog cutaneous pectoris muscle was shown using specific polyclonal antibodies. The modulatory roles of these receptors were investigated via assessment of the effects of muscarine and specific muscarinic antagonists on the quantal content of endplate currents (EPCs) and the time course of secretion, which was estimated from the distribution of "real" synaptic delays of EPCs recorded in a low Ca2+/high Mg2+ solution. The agonist muscarine decreased the EPC quantal content and synchronized the release process. The depressing action of muscarine on the EPC quantal content was abolished only by pretreatment of the preparation with the M3 blockers 4-DAMP (1,1-Dimethyl-4-diphenylacetoxypiperidinium iodide) and J 104129 fumarate ((αR)-α-Cyclopentyl-α-hydroxy-N-[1-(4-methyl-3-pentenyl)-4-piperidinyl]benzeneacetamide fumarate). Moreover, antagonists of the M1, M2, M3 and M4 receptors per se diminished the intensity of secretion, which suggests a putative up-regulation of the release by endogenous ACh.
Collapse
Affiliation(s)
- Andrei N Tsentsevitsky
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, P. O. Box 30, Lobachevsky Str., 2/31, Kazan, 420111, Russia; Open Laboratory of Neuropharmacology, Kazan Federal University, Kremlevskaya Str., 18, Kazan, 420000, Russia
| | - Irina V Kovyazina
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, P. O. Box 30, Lobachevsky Str., 2/31, Kazan, 420111, Russia; Open Laboratory of Neuropharmacology, Kazan Federal University, Kremlevskaya Str., 18, Kazan, 420000, Russia.
| | - Leniz F Nurullin
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, P. O. Box 30, Lobachevsky Str., 2/31, Kazan, 420111, Russia; Open Laboratory of Neuropharmacology, Kazan Federal University, Kremlevskaya Str., 18, Kazan, 420000, Russia; Department of Biology, Kazan State Medical University, Butlerov Str., 49, Kazan, 420012, Russia
| | - Eugeny E Nikolsky
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, P. O. Box 30, Lobachevsky Str., 2/31, Kazan, 420111, Russia; Open Laboratory of Neuropharmacology, Kazan Federal University, Kremlevskaya Str., 18, Kazan, 420000, Russia; Department of Medical and Biological Physics, Kazan State Medical University, Butlerov Str., 49, Kazan, 420012, Russia
| |
Collapse
|
5
|
Khuzakhmetova VF, Nurullin LF, Bukharaeva EA, Nikolsky EE. Involvement of dihydropyridine-sensitive calcium channels in high asynchrony of transmitter release in neuromuscular synapses of newborn rats. Dokl Biol Sci 2016; 470:220-223. [PMID: 27822757 DOI: 10.1134/s0012496616050124] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Indexed: 06/06/2023]
Abstract
Experiments on neuromuscular synapses of rats at different stages of ontogenesis have been performed. It has been found that one of the reasons of higher asynchrony of the release of single quanta of acetylcholine in the synapses of newborn animals is the activity of the presynaptic dihydropyridine-sensitive calcium channels of the L-type.
Collapse
Affiliation(s)
- V F Khuzakhmetova
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Tatarstan, Russia
- Kazan (Volga Region) Federal University, Kazan, Tatarstan, Russia
| | - L F Nurullin
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Tatarstan, Russia
- Kazan (Volga Region) Federal University, Kazan, Tatarstan, Russia
| | - E A Bukharaeva
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Tatarstan, Russia.
- Kazan (Volga Region) Federal University, Kazan, Tatarstan, Russia.
| | - E E Nikolsky
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Tatarstan, Russia
- Kazan (Volga Region) Federal University, Kazan, Tatarstan, Russia
- Kazan State Medical University, Kazan, Tatarstan, Russia
| |
Collapse
|
6
|
Nurullin LF, Tyapkina OV, Volkov EM. FLUORESCENT MICROSCOPY IDENTIFICATION OF THE EXPRESSION OF a2 AND b1 NA +/K+-ATPase, a1S (L-TYPE), ÑÀ2+-CHANNEL, SERCA 1/2/3 CA2+-ATPase SUBUNITS AT FAST AND SLOW MUSCLES IN THE HYPOGRAVITY MODELING EXPERIMENTS IN RATS. Tsitologiia 2016; 58:444-450. [PMID: 30192115] [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: 06/08/2023]
Abstract
The experiments of modeling hypogravity using fluorescent microscopy have shown a decrease of expression of b1 of Na +/K+-ATPase and Ca2+-ATPase subunits and the increase in the insensitivity of synthesis of a1S subunit of the L-type Ca2+-channel of the plasmatic membrane, whereas the synthesis of a2 subunit of Na+/K+-ATPase does not change. In «fast» muscle only observed similar for «slow» muscle decrease in the expression of b1 subunit without changing other parameters were studied. However, the decrease in fluorescence b1 subunit due to spread of data was not statistically significant. Thus hypogravity adversely affects the functioning primarily skeletal muscles, providing static load.
Collapse
|
7
|
Malomouzh AI, Petrov KA, Nurullin LF, Nikolsky EE. Metabotropic GABAB
receptors mediate GABA inhibition of acetylcholine release in the rat neuromuscular junction. J Neurochem 2015; 135:1149-60. [DOI: 10.1111/jnc.13373] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 09/16/2015] [Accepted: 09/21/2015] [Indexed: 12/25/2022]
Affiliation(s)
- Artem I. Malomouzh
- Kazan Institute of Biochemistry and Biophysics; Russian Academy of Sciences; Kazan Russia
- Kazan Federal University; Kazan Russia
| | - Konstantin A. Petrov
- Kazan Institute of Biochemistry and Biophysics; Russian Academy of Sciences; Kazan Russia
- Kazan Federal University; Kazan Russia
- A.E. Arbuzov Institute of Organic and Physical Chemistry; Russian Academy of Sciences; Kazan Russia
| | - Leniz F. Nurullin
- Kazan Institute of Biochemistry and Biophysics; Russian Academy of Sciences; Kazan Russia
- Kazan Federal University; Kazan Russia
- Kazan State Medical University; Kazan Russia
| | - Evgeny E. Nikolsky
- Kazan Institute of Biochemistry and Biophysics; Russian Academy of Sciences; Kazan Russia
- Kazan Federal University; Kazan Russia
- Kazan State Medical University; Kazan Russia
| |
Collapse
|
8
|
Malomuzh AI, Nurullin LF, Nikolsky EE. Immunohistochemical evidence of the presence of metabotropic receptors for γ-aminobutyric acid at the rat neuromuscular junctions. DOKL BIOCHEM BIOPHYS 2015; 463:236-8. [PMID: 26335820 DOI: 10.1134/s1607672915040092] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Indexed: 11/23/2022]
Abstract
in the synapses of the "fast" (m. EDL) and "slow" (m. soleus) skeletal muscles of the rat GABABR1 and GABABR2 subunits of metabotropic receptors for γ-aminobutyric acid (GABA), located primarily on the motor nerve ending membrane were detected by immunohistochemistry and fluorescence microscopy methods.
Collapse
Affiliation(s)
- A I Malomuzh
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, ul. Lobachevskogo 2/31, Kazan, 420111, Russia,
| | | | | |
Collapse
|
9
|
Odnoshivkina UG, Sytchev VI, Nurullin LF, Giniatullin AR, Zefirov AL, Petrov AM. β2-adrenoceptor agonist-evoked reactive oxygen species generation in mouse atria: implication in delayed inotropic effect. Eur J Pharmacol 2015; 765:140-53. [PMID: 26297975 DOI: 10.1016/j.ejphar.2015.08.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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: 04/14/2015] [Revised: 08/05/2015] [Accepted: 08/17/2015] [Indexed: 12/20/2022]
Abstract
Fenoterol, a β2-adrenoceptor agonist, has anti-apoptotic action in cardiomyocytes and induces a specific pattern of downstream signaling. We have previously reported that exposure to fenoterol (5 μM) results in a delayed positive inotropic effect which is related to changes in both Ca2+ transient and NO. Here, the changes in reactive oxygen species (ROS) production in response to the fenoterol administration and the involvement of ROS in effect of this agonist on contractility were investigated in mouse isolated atria. Stimulation of β2-adrenoceptor increases a level of extracellular ROS, while intracellular ROS level rises only after removal of fenoterol from the bath. NADPH-oxidase inhibitor (apocynin) prevents the increase in ROS production and the Nox2 isoform is immunofluorescently colocalized with β2-adrenoceptor at the atrial myocytes. Treatments with antioxidants (N-acetyl-L-cysteine, NADPH inhibitors, exogenous catalases) significantly inhibit the fenoterol induced increase in the contraction amplitude, probably by attenuating Ca2+ transient and up-regulating NO production. ROS generated in a β2-adrenoceptor-dependent manner can potentiate the activity of some Ca2+ channels. Indeed, inhibition of ryanodine receptors, TRPV-or L-type Ca2+- channels shows a similar efficacy in reduction of positive inotropic effect of both fenoterol and H2O2. In addition, detection of mitochondrial ROS indicates that fenoterol triggers a slow increase in ROS which is prevented by rotenone, but rotenone has no impact on the inotropic effect of fenoterol. We suggest that stimulation of β2-adrenoceptor with fenoterol causes the activation of NADPH-oxidase and after the agonist removal extracellularly generated ROS penetrates into the cell, increasing the atrial contractions probably via Ca2+ channels.
Collapse
Affiliation(s)
- Ulia G Odnoshivkina
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Vaycheslav I Sytchev
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Leniz F Nurullin
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center of Russian Academy of Sciences, Laboratory of Biophysics of Synaptic Processes, Lobatchevsky str. 2/31, P.O. 30, Kazan 420111, Russia
| | - Arthur R Giniatullin
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Andrei L Zefirov
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Alexey M Petrov
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia.
| |
Collapse
|
10
|
Tiapkina OV, Nurullin LF, Petrov KA, Volkov EM. [Influence of modeling of gravitational unloading on the postsynaptic acetylcholine receptor organization and acetylcholinesterase activity in neuromuscular synapses of rat fast and slow muscles]. Tsitologiia 2014; 56:758-762. [PMID: 25711085] [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: 06/04/2023]
Abstract
Using immunofluorescent techniques, we have revealed that, after 35 days of rats hindlimb unloading, neuromuscular synapses of fast and slow muscles show enhanced fluorescence intensity and decreased area of fluorescent staining of acetylcholine receptors; increased fluorescent intensity and area of fluorescent staining for acetylcholinesterase. The ratio of the number of postsynaptic acetylcholine receptors and the amount of acetylcholinesterase changed as well as their spatial position in relation to each other. These rearrangements correspond to electrophysiological data on the reduction of the amplitude of the miniature endplate currents in both muscles. Identified synapses restructuring accompanied by a decrease in the volume of muscle fibers. Hindlimb unloading (simulation of hypogravity) leads to an increase in functional activity of acetylcholinesterase on the background of reduced postsynaptic membrane area occupied by acetylcholine receptors. This leads to a decrease in the amplitude of excitatory postsynaptic potentials thereby reducing the nerve-muscle excitation transmission safety factor.
Collapse
|
11
|
Nurullin LF, Tsentsevitsky AN, Malomouzh AI, Nikolsky EE. Revealing of T-type low-voltage activated calcium channels (CaV3) in frog neuromuscular junctions. Dokl Biol Sci 2013; 449:73-5. [PMID: 23652430 DOI: 10.1134/s0012496613020038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Indexed: 11/23/2022]
Affiliation(s)
- L F Nurullin
- Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, Kazan, 420111 Tatarstan, Russia
| | | | | | | |
Collapse
|
12
|
Tyapkina OV, Malomouzh AI, Nurullin LF, Nikolsky EE. Quantal and non-quantal acetylcholine release at neuromuscular junctions of muscles of different types in a model of hypogravity. Dokl Biol Sci 2013; 448:4-6. [PMID: 23479007 DOI: 10.1134/s0012496613010043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Indexed: 11/23/2022]
Affiliation(s)
- O V Tyapkina
- Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, Tatarstan, Russia
| | | | | | | |
Collapse
|
13
|
Khuzakhmetova BF, Samigullin DV, Nurullin LF, Nikol'skiĭ EE, Bukhareva ÉA. [Neuromuscular synaptic transmission at different stages of postnatal development in rats]. Ross Fiziol Zh Im I M Sechenova 2012; 98:1544-1554. [PMID: 23461198] [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: 06/01/2023]
Abstract
On the nerve-muscle preparation of rats diaphragm muscle on different stages of postnatal development, the comparison of morphological features and functions of synaptic apparatus, including induced secretion time parameters was carried out. It was found that, along with the reduced, compared to the adult animals, area of nerve endings in the newborn the speed of the motor nerve excitation was slower, intensity of spontaneous and induced secretion of quantum fluctuations was reduced and real synaptic delays in the end plate were intense. Severe degree of acetylcholine quanta asynchronous secretion with longer open state of the ion channel in newborns synapses can compensate reduction in reliability of synaptic transmission due to a decrease of the quantal content of the postsynaptic response.
Collapse
|
14
|
Tiapkina OV, Nurullin LF, Rezviakov PN, Kozlovskaia IB, Nikol'skiĭ EE, Islamov RR. [Myelination disorders in mechanism of hypogravity motor syndrome development]. Biofizika 2012; 57:876-879. [PMID: 23136782] [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: 06/01/2023]
Abstract
When modeling effects of hypogravitation by the method of hindlimb unloading in rats the area of cross-section in lumbar part of a spinal cord was found to reduce. The analysis of spinal cord slides showed that these changes are associated with a decrease in the area of white substance of a spinal cord. Data obtained are consistent with our previous observation of a decrease in expression of the genes encoding myelin proteins. Results of our researches give the good reasons to believe that miyelinization failure in CNS is one of the factors that underlie the development of hypogravitational motor syndrome.
Collapse
|
15
|
Abramochkin DV, Tapilina SV, Sukhova GS, Nikolsky EE, Nurullin LF. Functional M3 cholinoreceptors are present in pacemaker and working myocardium of murine heart. Pflugers Arch 2012; 463:523-9. [PMID: 22350728 DOI: 10.1007/s00424-012-1075-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 01/17/2012] [Accepted: 01/23/2012] [Indexed: 11/27/2022]
Abstract
The presence of M3 cholinoreceptors and their role in mediation of action potential waveform modulation were determined by immunolabeling of receptor proteins and standard microelectrode technique, respectively. The sinoatrial node (SAN), which was determined as a connexin 43 negative area within the intercaval region, the surrounding atrial tissue, and the working ventricular myocardium exhibited labeling of both M3 and M2 receptors. However, the density of M3 and M2 labeling was about twofold higher in the SAN compared to working myocardium. The stimulation of M3 receptors was obtained by application of nonselective M1 and M3 muscarinic agonist pilocarpine (10(-5) M) in the presence of selective M2 blocker methoctramine (10(-7) M). Stimulation of M3 receptors provoked marked shortening of action potential duration in atrial and ventricular working myocardium. In the SAN, M3 stimulation leads to a significant reduction of sinus rhythm rate accompanied with slowing of diastolic depolarization and increase of action potential upstroke velocity. All electrophysiological effects of selective M3 stimulation were suppressed by specific blocker of M3 receptors 4-DAMP (10(-8) M). We conclude that M3 cholinoreceptors are present in pacemaker and working myocardium of murine heart, where they mediate negative cholinergic effects: slowing of sinus rhythm and shortening of action potentials.
Collapse
Affiliation(s)
- Denis V Abramochkin
- Department of Human and Animal Physiology, Moscow State University, Leninskiye Gory 1, Moscow, Russia.
| | | | | | | | | |
Collapse
|
16
|
Malomouzh AI, Nurullin LF, Arkhipova SS, Nikolsky EE. NMDA receptors at the endplate of rat skeletal muscles: Precise postsynaptic localization. Muscle Nerve 2011; 44:987-9. [DOI: 10.1002/mus.22250] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
17
|
Nurullin LF, Mukhitov AR, Tsentsevytsky AN, Petrova NV, Samigullin DV, Malomouzh AI, Bukharaeva EA, Vyskočil F, Nikolsky EE. Voltage-dependent P/Q-type calcium channels at the frog neuromuscular junction. Physiol Res 2011; 60:815-23. [PMID: 21812515 DOI: 10.33549/physiolres.932219] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
It is well known that antagonists of N-type voltage-gated calcium channels inhibit the evoked quantal release of acetylcholine in amphibian neuromuscular synapses. This, however, does not exclude the functional expression of other types of voltage-gated calcium channels in these nerve terminals. Using immunocytochemistry, we detected the expression of the alpha1A subunit of P/Q-type calcium channels (that is otherwise typical of mammalian motor nerve endings) in the frog neuromuscular junction. In addition, we demonstrated that the P/Q-type channel blocker omega-agatoxin IVA (20 nM) reduced the action potential-induced calcium transient and significantly decreased both spontaneous and evoked mediator release. Our data indicates the functional expression of P/Q-type calcium channels in the frog motor nerve ending which participate in acetylcholine release.
Collapse
Affiliation(s)
- L F Nurullin
- Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, Kazan, Russia
| | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Nurullin LF, Abramochkin DV, Tarasova NV, Rosenshtraukh LV, Nikolsky EE. Endo- and exocytosis of vesicles in the intramural nerve fibers of the rat right atrium. Dokl Biol Sci 2009; 428:423-6. [PMID: 19994780 DOI: 10.1134/s0012496609050093] [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] [Indexed: 11/23/2022]
Affiliation(s)
- L F Nurullin
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, ul. Lobachevskogo 2/31, Kazan, 420111 Russia
| | | | | | | | | |
Collapse
|
19
|
Abramochkin DV, Nurullin LF, Borodinova AA, Tarasova NV, Sukhova GS, Nikolsky EE, Rosenshtraukh LV. Non-quantal release of acetylcholine from parasympathetic nerve terminals in the right atrium of rats. Exp Physiol 2009; 95:265-73. [PMID: 19767403 DOI: 10.1113/expphysiol.2009.050302] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Acetylcholinesterase (AChE) inhibitors provoke typical cholinergic effects in the isolated right atrium of the rat due to the accumulation of acetylcholine (ACh). Our study was designed to show that in the absence of vagal impulse activity, ACh is released from the parasympathetic nerve fibres by means of non-quantal secretion. The conventional microelectrode technique was used to study changes in action potential (AP) configuration in the right atrium preparation of rats during application of AChE inhibitors. Staining with the lipophilic fluorescent dye FM1-43 was used to demonstrate the presence of endocytosis in cholinergic endings. The AChE inhibitors armin (10(7)-10(5)m) and neostigmine (10(7) to 5 x 10(6)m) caused a reduction of AP duration and prolonged the cycle length. These effects were abolished by atropine and were therefore mediated by ACh accumulated in the myocardium during AChE inhibition. Putative block of impulse activity of the postganglionic neurons by tetrodotoxin (5 x 10(7)m) and blockade of ganglionic transmission by hexomethonium (2 x 10(4)m), as well as blockade of all forms of quantal release with Clostridium botulinum type A toxin (50 U ml(1)), did not alter the effects of armin. Experiments with FM1-43 dye confirmed the effective block of exocytosis by botulinum toxin. Selective inhibition of the choline uptake system using hemicholinium III (10(5)m), which blocks non-quantal release at the neuromuscular junction, suppressed the effects of AChE inhibitors. Thus, accumulation of ACh is likely to be caused by non-quantal release from cholinergic terminals. We propose that non-quantal release of ACh, shown previously at the neuromuscular junction, is present in cholinergic postganglionic fibres of the rat heart in addition to quantal release.
Collapse
Affiliation(s)
- Denis V Abramochkin
- Department of Human and Animal Physiology, Biological Faculty of the Moscow State University, Leninskije Gory, 1, 12, Moscow, Russia.
| | | | | | | | | | | | | |
Collapse
|
20
|
Volkov EM, Nurullin LF, Nikolsky E, Vyskocil F. Miniature excitatory synaptic ion currents in the earthworm Lumbricus terrestris body wall muscles. Physiol Res 2007; 56:655-658. [PMID: 17973597 DOI: 10.33549/physiolres.931269] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The miniature excitatory postsynaptic currents (MEPCs) of the muscle cells of the earthworm Lumbricus terrestris were recorded by glass microelectrodes. In a single synaptic zone, three types of MEPC were recorded: a fast single-exponential type that decayed with tau =0.9 ms, a slow single-exponential with tau = 9.2 ms and a two-exponential MEPC with tau = 1.3 and 8.5 ms, respectively. The muscle cells of earthworms contain populations of yet-unidentified ionic channels that might be different from the common nicotinic and muscarinic groups of acetylcholine receptors, since these MEPCs are not sensitive to d-tubocurarine, atropine, benzohexonium or proserine. Alternatively, besides ACh receptors, the membrane may contain receptors for another yet-unidentified excitatory transmitter.
Collapse
|
21
|
Volkov EM, Sabirova AR, Nurullin LF, Zefirov AL. Functional heterogeneity of the "transporter" of electrogenic ionic pump of the Lumbricus terrestris somatic myocyte membrane. Bull Exp Biol Med 2007; 142:720-2. [PMID: 17603680 DOI: 10.1007/s10517-006-0461-0] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Potential created by electrogenic ionic pumps under conditions of maximum activation in a warm standard ionic medium with K(+) after preincubation in cold potassium-free solution has two components: a higher ouabaine-insensitive "stationary" component, and a lower "regulatory" component sensitive to ouabaine, furosemide, and removal of Cl(-) or Ca(2+) from the medium. Functional heterogeneity of electrogenic ionic pumps is hypothesized implying the existence of two components: "stationary" (not regulated extracellularly) and "regulatory" (controlled and directly related to active Cl(-) transfer).
Collapse
Affiliation(s)
- E M Volkov
- Kazan State Medical University, Russian Ministry of Health, Russia.
| | | | | | | |
Collapse
|
22
|
Volkov EM, Sabirova AR, Nurullin LF, Grishin SN, Zefirov AL. Effect of GABAergic and adrenergic agents on activity of Na+/K+ pump and Cl(-)-cotransport in somatic muscle cells of earthworm Lumbricus Terrestris. Bull Exp Biol Med 2006; 141:633-5. [PMID: 17181071 DOI: 10.1007/s10517-006-0239-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 11/28/2022]
Abstract
GABA, baclofen, epinephrine, and norepinephrine hyperpolarized the membrane of earthworm somatic cells. This effect was prevented by furosemide, removal of Cl- from the medium, or activation of Na+/K+ pump by 3-fold increase external potassium concentration. It was hypothesized that GABA, baclofen, epinephrine, and norepinephrine stimulate Na+/K+ transport via specific receptor inputs, but their effect on resting potential can be realized only under conditions of working Cl- symport.
Collapse
|
23
|
Volkov EM, Nurullin LF, Sabirova AR, Zefirov AL. The role of chlorine ion cotransport in the regulation of rest potential and osmotic homeostasis in eartearthworm somatic muscle cells. Dokl Biol Sci 2006; 406:1-3. [PMID: 16572799 DOI: 10.1134/s0012496606010017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
24
|
Volkov EM, Nurullin LF. Effects of cholinergic receptor agonists and antagonists on miniature stimulatory postsynaptic ionic currents in somatic muscle cells of lumbricus terrestris. Bull Exp Biol Med 2005; 139:360-2. [PMID: 16027853 DOI: 10.1007/s10517-005-0294-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 11/27/2022]
Abstract
Miniature stimulating postsynaptic currents of Lumbricus terrestris somatic muscle cells were recorded. Atropine, d-tubocurarin, alpha-bungarotoxin, carbacholine, and proserin did not modify the amplitude and temporal parameters of miniature stimulatory postsynaptic currents, while carbacholine and nicotine depolarized the muscle membrane. Presumably, Lumbricus terrestris muscle cells contain acetylcholine-sensitive channel-receptor complexes not belonging to classical nicotinic or muscarinic acetylcholine receptors.
Collapse
|
25
|
Volkov EM, Nurullin LF. Two populations of miniature excitatory synaptic ionic currents in somatic muscle cells of Lumbricus terrestris earthworm body wall. Bull Exp Biol Med 2004; 136:503-6. [PMID: 14968172 DOI: 10.1023/b:bebm.0000017105.06176.bb] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 11/12/2022]
Abstract
Three types of miniature excitatory synaptic currents were recorded in the same synaptic region of earthworm muscle cells: monoexponential (tau=1.2 msec) and biexponential (tau(1)=1.2 and tau(2)=8.0 msec). It was hypothesized that earthworm muscle cells contain at least two populations of acetylcholine-sensitive ionic channels, which do not belong to classical nicotinic and muscarinic acetylcholine receptors.
Collapse
|
26
|
Volkov EM, Nurullin LF, Grishin SN, Zefirov AL. Effects of some transmitters on resting membrane potential of somatic cell in Lumbricus terrestris muscle wall. Bull Exp Biol Med 2003; 136:189-91. [PMID: 14631507 DOI: 10.1023/a:1026335427557] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 05/15/2003] [Indexed: 11/12/2022]
Abstract
Serotonin, glutamate, glycine, ATP, and muscarine had no effect on resting membrane potential of muscle cell in earthworm Lumbricus terrestris. Nicotine depolarizes and GABA hyperpolarizes the muscle membrane. Removal of K(+), Cl(-) and addition of ouabaine and strychnine to the solution abolished the effect of GABA. The authors conclude that the Lumbricus terrestris myocyte membrane contains nicotine receptors and GABAergic receptors sensitive to strychnine. Stimulation of these receptors activates sarcolemmal ionic pumps and causes membrane hyperpolarization.
Collapse
|
27
|
Volkov EM, Nurullin LF, Nikolsky E, Krůsek J, Vyskocil F. Chloride cotransport in the membrane of earthworm body wall muscles. Physiol Res 2003; 52:587-92. [PMID: 14535834] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023] Open
Abstract
The resting membrane potential (V(m)) of isolated somatic longitudinal muscles of the earthworm Lumbricus terrestris was studied by glass microelectrodes. The inhibition of chloride permeability by low pH did not affect V(m) of the muscle fibers in isolated somatic longitudinal muscles of the earthworm Lumbricus terrestris which was -48.7 mV (inside negative) at pH 7.3 and -49.1 at pH 5.6. On the other hand, bathing the muscles in Cl(-) and Na(+)-free solutions, or application of the chloride transporter inhibitor furosemide and Na(+)-K(+)-ATPase inhibitor ouabain depolarized the V(m) by 3-5 mV. The effects of a Cl(-) -free solution and ouabain were not additive. This demonstrates relatively small contribution of equilibrium potential for Cl(-) to the resting membrane potential and electrogenic effect of Na(+)K(+)-ATPase which is dependent on the supply of Na(+)(i) ions by furosemide-sensitive and Cl(-)(e)- and Na(+)(e)-dependent electroneutral transport (most probably Na(+)K(+)Cl(-) cotransport).
Collapse
|
28
|
Volkov EM, Nurullin LF. Effect of ionic medium on carbacholine-induced membrane depolarization in lumbricus terrestris somatic muscle cells. Bull Exp Biol Med 2002; 134:428-9. [PMID: 12802441 DOI: 10.1023/a:1022669726019] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Carbacholine depolarizes Lumbricus terrestris myocyte membrane. Addition of verapamil, tetrodotoxin, removal of K(+), Cl(-), and Ca(2+), and replacement of Ca(2+)with Mn(2+)in the bathing solution did not prevent the carbacholine-induced decrease in resting potential, but in a sodium-free medium carbacholine was ineffective. It was hypothesized that depolarization of the sarcolemma resulting from activation of cholinomimetic-sensitive channel-receptor complex of the Lumbricus terrestris somatic muscle cells is primarily determined by sodium permeability of the membrane.
Collapse
|
29
|
Volkov EM, Nurullin LF, Obukhova AS, Chikin AV, Nikol'skii EE. Calcium mechanism of norepinephrine activation of ionic pump in somatic cells of lumbricus terrestris earthworm muscle wall. Bull Exp Biol Med 2002; 134:18-9. [PMID: 12459858 DOI: 10.1023/a:1020688117507] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2002] [Indexed: 11/12/2022]
Abstract
Blockade of norepinephrine-induced hyperpolarization in earthworm muscle cells was observed in a calcium-free medium, after substitution of Ca(2+)with Mn(2+), and in the presence of verapamil or chlorpromazine to the incubation saline. Changes in Ca(2+)concentration in the saline and addition of caffeine had no effect on the resting potential of muscle cells. It was hypothesized that signal transduction from norepinephrine-activated membrane adrenoceptors to the ionic pump in earthworm muscle cells depends on influx of extracellular Ca(2+)and subsequent involvement of Ca(2+)-accepting proteins similar to calmodulin in vertebrates.
Collapse
|
30
|
Volkov EM, Nurullin LF, Nikol'skiĭ EE. [Influence of sodium pump and Na(+), K(+), CL(-)-cotransport on the resting membrane potential of somatic muscle cells of the earthworm Lumbricus terrestris]. Ross Fiziol Zh Im I M Sechenova 2001; 87:1153-60. [PMID: 11763527] [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: 02/23/2023]
Abstract
Tetrodotoxin and acidic pH do not change the resting membrane potential (RMP), whereas Na+ or Cl- free solutions or ouabain and furosemide equally depolarize the membrane of the earthworm somatic muscle cells. The findings of the RMP depending on extracellular K+ concentration corroborate theoretical model by Goldman-Hodgkin-Katz only in Na(+)-free medium or in presence of ouabain. The data suggest that the RMP is the sum of potassium and chlorine diffusion potentials as well as of the potential produced by electrogenic component of Na+ pump and, probably, by furosemide-sensitive Na+,K+Cl- co-transport.
Collapse
Affiliation(s)
- E M Volkov
- Kazan State Medical University, Kazan, 420012, Butlerov St., 49, Russia
| | | | | |
Collapse
|
31
|
Volkov EM, Nurullin LF, Nikol'skii EE, Blokhina GI. Effects of norepinephrine and epinephrine on resting membrane potential in body wall muscle cells of Lumbricus terrestris earthworm. Bull Exp Biol Med 2001; 132:821-3. [PMID: 11740568 DOI: 10.1023/a:1013114830161] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2001] [Indexed: 11/12/2022]
Abstract
Norepinephrine and to a lesser extent epinephrine increased the resting membrane potential of earthworm body wall muscle cells. Ouabain, phentolamine, propranolol, and replacement of Ca(2+) with Mg(2+) in the incubation medium abolished this effect. External 3'5'-cAMP in high concentration, dibutyryl cAMP, and dibutyryl cGMP did not induced hyperpolarization of muscle cell membranes. It was concluded that norepinephrine and epinephrine increased the resting membrane potential in earthworm body wall muscle cells via activation of Na(+), K(+) pump. This process involves Ca(2+) and sarcolemmal adrenergic structures, similar to alpha-adrenoceptors in vertebrate, but not the cyclic nucleotide systems.
Collapse
|
32
|
Volkov EM, Nurullin LF, Frosin VN. Effect of cholinergic agonists on resting membrane potential of earthworm body wall muscle cells. Bull Exp Biol Med 2001; 131:397-8. [PMID: 11550037 DOI: 10.1023/a:1017980909248] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 12/06/2000] [Indexed: 11/12/2022]
Abstract
Carbachol in a concentration of 5x10(-8) mol/liter does not hyperpolarize, and in a concentration of 5x10(-6) mol/liter depolarizes the membrane of somatic muscle cell in earthworm. d-tubocurarine, alpha-bungarotoxin, atropine, and hexamethonium added to the incubation medium did not abolish the carbachol-induced decrease in resting membrane potential. Each of these drugs alone had no effect on resting membrane potential in muscle cells. Presumably, the acetylcholine-sensitive receptor-channel membrane complex in earthworm muscle cell differs from acetylcholine receptor in skeletal muscle fibers and peripheral neurons of vertebrates.
Collapse
|
33
|
Volkov EM, Nurullin LF, Svandová I, Nikolsky EE, Vyskocil F. Participation of electrogenic Na+-K+-ATPase in the membrane potential of earthworm body wall muscles. Physiol Res 2001; 49:481-4. [PMID: 11072810] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
The effect of Na+-K+-ATPase inhibitor ouabain on the resting membrane potential (Vm) was studied by glass microelectrodes in isolated somatic longitudinal muscles of the earthworm Lumbricus terrestris and compared with frog sartorius muscle. In earthworm muscle, Vm was -49 mV (inside negative) in a reference external solution with 4 mmol/l K+. The electrogenic participation of Na+-K+-ATPase was absent in solutions with very low concentrations of 0.01 mmol/l K+, higher in 4 and 8 mmol/l K+ (4-5 mV) and maximal (13 mV) in solutions containing 12 mmol/l K+ where Vm was -46 mV in the absence and -33 mV in the presence of 1 x 10(4) M ouabain. The electrogenic participation of Na+-K+-ATPase was much smaller in m. sartorius of the frog Rana temporaria bathed in 8 and 12 mmol/l K+. The results indicate that the Na+-K+-ATPase is an important electrogenic factor in earthworm longitudinal muscle fibres and that its contribution to Vm depends directly on the concentration of K+ in the bathing solution.
Collapse
|
34
|
Volkov EM, Nurullin LF, Nikol'skiĭ EE. [Effect of the medium composition on the resting membrane potential in the earthworm longitudinal somatic muscle fibers]. Ross Fiziol Zh Im I M Sechenova 2000; 86:329-34. [PMID: 10808530] [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: 02/16/2023]
Abstract
Norepinephrine or increased extracellular K+ hyperpolarize the membrane of the earthworm somatic muscle fibre, whereas removal of Cl- from external solution or a hypotonic solution depolarize the membrane. The dependence of the membrane resting potential on the extracellular K+ is quite characteristic against the background of ouabain action. A preliminary membrane depolarisation by ouabain eliminates the above effects on the membrane resting potential. The data obtained suggest that the ouabain-sensitive active ion pump directly contributes to the membrane resting potential value. This hypothesis is discussed with respect to existence of active Cl- transport combined with Na+, K(+)-pump which presumably takes part in the intracellular osmotic pressure regulation in the earthworm somatic muscle.
Collapse
|