1
|
Mitrokhin VM, Kamkina OV, Kamkin AG, Rodina AS, Zolotareva AD, Zolotarev VI, Kazansky VE, Gorbacheva LR, Bilichenko AS, Shileiko SA, Mladenov MI. Simulated Microgravity and Hypergravity Affect the Expression Level of Soluble Guanylate Cyclase, Adenylate Cyclase, and Phosphodiesterase Genesin Rat Ventricular Cardiomyocytes. Bull Exp Biol Med 2024; 176:359-362. [PMID: 38342810 DOI: 10.1007/s10517-024-06024-z] [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: 07/18/2023] [Indexed: 02/13/2024]
Abstract
Ion channels activity is regulated through soluble guanylate cyclase (sGC) and adenylate cyclase (AC) pathways, while phosphodiesterases (PDE) control the intracellular levels of cAMP and cGMP. Here we applied RNA transcriptome sequencing to study changes in the gene expression of the sGC, AC, and PDE isoforms in isolated rat ventricular cardiomyocytes under conditions of microgravity and hypergravity. Our results demonstrate that microgravity reduces the expression of sGC isoform genes, while hypergravity increases their expression. For a subset of AC isoforms, gene expression either increased or decreased under both microgravity and hypergravity conditions. The expression of genes encoding 10 PDE isoforms decreased under microgravity, but increased under hypergravity. However, under both microgravity and hypergravity, the gene expression increased for 7 PDE isoforms and decreased for 3 PDE isoforms. Overall, our findings indicate specific gravity-dependent changes in the expression of genes of isoforms associated with the studied enzymes.
Collapse
Affiliation(s)
- V M Mitrokhin
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - O V Kamkina
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A G Kamkin
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia.
| | - A S Rodina
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A D Zolotareva
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - V I Zolotarev
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - V E Kazansky
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - L R Gorbacheva
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A S Bilichenko
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - S A Shileiko
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - M I Mladenov
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| |
Collapse
|
2
|
Kamkin AG, Kamkina OV, Kazansky VE, Mitrokhin VM, Bilichenko A, Nasedkina EA, Shileiko SA, Rodina AS, Zolotareva AD, Zolotarev VI, Sutyagin PV, Mladenov MI. Identification of RNA reads encoding different channels in isolated rat ventricular myocytes and the effect of cell stretching on L-type Ca 2+current. Biol Direct 2023; 18:70. [PMID: 37899484 PMCID: PMC10614344 DOI: 10.1186/s13062-023-00427-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 10/13/2023] [Indexed: 10/31/2023] Open
Abstract
BACKGROUND The study aimed to identify transcripts of specific ion channels in rat ventricular cardiomyocytes and determine their potential role in the regulation of ionic currents in response to mechanical stimulation. The gene expression levels of various ion channels in freshly isolated rat ventricular cardiomyocytes were investigated using the RNA-seq technique. We also measured changes in current through CaV1.2 channels under cell stretching using the whole-cell patch-clamp method. RESULTS Among channels that showed mechanosensitivity, significant amounts of TRPM7, TRPC1, and TRPM4 transcripts were found. We suppose that the recorded L-type Ca2+ current is probably expressed through CaV1.2. Furthermore, stretching cells by 6, 8, and 10 μm, which increases ISAC through the TRPM7, TRPC1, and TRPM4 channels, also decreased ICa,L through the CaV1.2 channels in K+ in/K+ out, Cs+ in/K+ out, K+ in/Cs+ out, and Cs+ in/Cs+ out solutions. The application of a nonspecific ISAC blocker, Gd3+, during cell stretching eliminated ISAC through nonselective cation channels and ICa,L through CaV1.2 channels. Since the response to Gd3+ was maintained in Cs+ in/Cs+ out solutions, we suggest that voltage-gated CaV1.2 channels in the ventricular myocytes of adult rats also exhibit mechanosensitive properties. CONCLUSIONS Our findings suggest that TRPM7, TRPC1, and TRPM4 channels represent stretch-activated nonselective cation channels in rat ventricular myocytes. Probably the CaV1.2 channels in these cells exhibit mechanosensitive properties. Our results provide insight into the molecular mechanisms underlying stretch-induced responses in rat ventricular myocytes, which may have implications for understanding cardiac physiology and pathophysiology.
Collapse
Affiliation(s)
- Andre G Kamkin
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Olga V Kamkina
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Viktor E Kazansky
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Vadim M Mitrokhin
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Andrey Bilichenko
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Elizaveta A Nasedkina
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Stanislav A Shileiko
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Anastasia S Rodina
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Alexandra D Zolotareva
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Valentin I Zolotarev
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Pavel V Sutyagin
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation
| | - Mitko I Mladenov
- Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russian Federation.
- Faculty of Natural Sciences and Mathematics, Institute of Biology, "Ss. Cyril and Methodius" University, Skopje, North, Macedonia.
| |
Collapse
|
3
|
Kamkin AG, Mitrokhin VM, Kamkina OV, Kazansky VE, Rodina AS, Zolotareva AD, Zolotarev VI, Sutyagin PV, Mladenov MI, Shenkman BS, Kalashnikov VE, Orlov OI. Simulated Microgravity Changes the Number of Mechanically Gated and Mechanosensitive Ion Channels Genes Transcripts in Rat Ventricular Cardiomyocytes. DOKL BIOCHEM BIOPHYS 2023; 512:251-255. [PMID: 38093125 DOI: 10.1134/s1607672923700369] [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: 05/25/2023] [Revised: 06/03/2023] [Accepted: 06/05/2023] [Indexed: 12/18/2023]
Abstract
The mechanoelectrical feedback in the heart is based on the work of mechanically gated (MGCs) and mechanosensitive (MSCs) channels. Since microgravity alters the heart's morphological and physiological properties, we hypothesized that the expression of both MGCs and MSCs would be affected. We employed RNA transcriptome sequencing to investigate changes in the gene transcript levels of MGCs and MSCs in isolated rat ventricular cardiomyocytes under control conditions and in a simulated microgravity environment. For the first time, our findings demonstrated that simulated microgravity induces alterations in the gene transcript levels of specific MGCs, such as TRPM7, TRPV2, TRPP1, TRPP2, Piezo1, TMEM63A, TMEM36B, and known MSCs, including K2P2.1, K2P3.1, Kir6.1, Kir6.2, NaV1.5, CaV1.2, KV7.1. However, other voltage-gated channels and channels lacking a voltage sensor remained unaffected. These findings suggest that the altered expression of MGCs and MSCs could lead to changes in the net currents across the membrane, ultimately impacting the heart's function.
Collapse
Affiliation(s)
- A G Kamkin
- Pirogov Russian National Research Medical University, Moscow, Russia.
| | - V M Mitrokhin
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - O V Kamkina
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - V E Kazansky
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - A S Rodina
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - A D Zolotareva
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - V I Zolotarev
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - P V Sutyagin
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - M I Mladenov
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - B S Shenkman
- State Scientific Center of Russian Federation Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - V E Kalashnikov
- State Scientific Center of Russian Federation Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - O I Orlov
- State Scientific Center of Russian Federation Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| |
Collapse
|
4
|
Kamkin AG, Mitrokhin VM, Kamkina OV, Kazansky VE, Bilichenko AS, Rodina AS, Zolotareva AD, Zolotarev VI, Sutyagin PV, Mladenov MI. Hypergravity Increases the Number of Gene Transcripts of Mechanically Gated and Mechanosensitive Ion Channels in Rat Ventricular Cardiomyocytes. Bull Exp Biol Med 2023; 175:730-733. [PMID: 37979024 DOI: 10.1007/s10517-023-05955-3] [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: 05/11/2023] [Indexed: 11/19/2023]
Abstract
Since hypergravity changes the morphological and physiological properties of the heart, it was assumed that the expression of ion channels that respond to cell stretching or compressing, mechanically gated channels (MGC) and mechanosensitive channels (MSC), would be affected. Using RNA transcriptome sequencing, the change in the number of transcripts for MGC and MSC genes was studied in isolated rat ventricular cardiomyocytes under 4g hypergravity for 5 days. It was shown for the first time that hypergravity induces changes in the number of transcripts of MGC genes: an increase for TRPC1, TRPC3, TRPM7, TRPP1 (PKD1), TRPP2 (PKD2), TMEM63A, TMEM63B, but a decrease for TRPV2, Piezo1, Piezo2. The number of MSC gene transcripts increases: TREK-1, Kir6.2, Nav1.5, Cav1.2, Cav1.3, Kv7.1, and Kv1.2. This potentially leads to an increase in the expression of MGC and MSC proteins leading to an increase in the net current and, as a result, pathological changes in the heart function.
Collapse
Affiliation(s)
- A G Kamkin
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia.
| | - V M Mitrokhin
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - O V Kamkina
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - V E Kazansky
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A S Bilichenko
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A S Rodina
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A D Zolotareva
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - V I Zolotarev
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - P V Sutyagin
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - M I Mladenov
- Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| |
Collapse
|
5
|
Kamkin AG, Kamkina OV, Shim AL, Bilichenko A, Mitrokhin VM, Kazansky VE, Filatova TS, Abramochkin D, Mladenov MI. The role of activation of two different sGC binding sites by NO-dependent and NO-independent mechanisms in the regulation of SACs in rat ventricular cardiomyocytes. Physiol Rep 2022; 10:e15246. [PMID: 35384354 PMCID: PMC8981922 DOI: 10.14814/phy2.15246] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [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: 08/26/2021] [Revised: 03/09/2022] [Accepted: 03/09/2022] [Indexed: 04/18/2023] Open
Abstract
The mechanoelectrical feedback (MEF) mechanism in the heart that plays a significant role in the occurrence of arrhythmias, involves cation flux through cation nonselective stretch-activated channels (SACs). It is well known that nitric oxide (NO) can act as a regulator of MEF. Here we addressed the possibility of SAC's regulation along NO-dependent and NO-independent pathways, as well as the possibility of S-nitrosylation of SACs. In freshly isolated rat ventricular cardiomyocytes, using the patch-clamp method in whole-cell configuration, inward nonselective stretch-activated cation current ISAC was recorded through SACs, which occurs during dosed cell stretching. NO donor SNAP, α1-subunit of sGC activator BAY41-2272, sGC blocker ODQ, PKG blocker KT5823, PKG activator 8Br-cGMP, and S-nitrosylation blocker ascorbic acid, were employed. We concluded that the physiological concentration of NO in the cell is a necessary condition for the functioning of SACs. An increase in NO due to SNAP in an unstretched cell causes the appearance of a Gd3+ -sensitive nonselective cation current, an analog of ISAC , while in a stretched cell it eliminates ISAC . The NO-independent pathway of sGC activation of α subunit, triggered by BAY41-2272, is also important for the regulation of SACs. Since S-nitrosylation inhibitor completely abolishes ISAC , this mechanism occurs. The application of BAY41-2272 cannot induce ISAC in a nonstretched cell; however, the addition of SNAP on its background activates SACs, rather due to S-nitrosylation. ODQ eliminates ISAC , but SNAP added on the background of stretch increases ISAC in addition to ODQ. This may be a result of the lack of NO as a result of inhibition of NOS by metabolically modified ODQ. KT5823 reduces PKG activity and reduces SACs phosphorylation, leading to an increase in ISAC . 8Br-cGMP reduces ISAC by activating PKG and its phosphorylation. These results demonstrate a significant contribution of S-nitrosylation to the regulation of SACs.
Collapse
Affiliation(s)
- Andre G. Kamkin
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
| | - Olga V. Kamkina
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
| | - Andrey L. Shim
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
| | - Andrey Bilichenko
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
| | - Vadim M. Mitrokhin
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
| | - Viktor E. Kazansky
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
| | - Tatiana S. Filatova
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
- Department of Human and Animal PhysiologyLomonosov Moscow State UniversityMoscowRussia
| | - Denis V. Abramochkin
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
- Department of Human and Animal PhysiologyLomonosov Moscow State UniversityMoscowRussia
| | - Mitko I. Mladenov
- Department of PhysiologyPirogov Russian National Research Medical UniversityMoscowRussia
- Faculty of Natural Sciences and MathematicsInstitute of Biology, “Ss. Cyril and Methodius” UniversitySkopjeMacedonia
| |
Collapse
|
6
|
Mitrokhin MV, Kalsin V, Kamkina O, Babkina I, Zotov A, Troitskiy VA, Mladenov MI, Kamkin GA. Participation of PKG and PKA-related pathways in the IFN-γ induced modulation of the BK Ca channel activity in human cardiac fibroblasts. J Pharmacol Sci 2019; 141:25-31. [PMID: 31533896 DOI: 10.1016/j.jphs.2019.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 02/20/2019] [Revised: 07/31/2019] [Accepted: 08/20/2019] [Indexed: 01/19/2023] Open
Abstract
This study was devoted to elucidating the interferon (IFN)-γ-induced signaling pathway and the interaction between protein kinase G (PKG) and protein kinase A (PKA) through large-conductance Ca(2+)-activated K(+) channels in human cardiac fibroblasts. The IK currents were recorded using a whole-cell patch clamp method. A large depolarization (+50 mV) and a high Ca2+ concentration (pCa 6.0) were used in the internal pipette solution to activate only the KCa channels. Iberiotoxin (Ibtx), which selectively inhibits BKCa channels at a concentration of 100 nmol/l, caused a significant reduction of basal IK. Adding IFN-γ in the presence of Ibtx had no effect on IK. Application of the IFN-γ caused a significant reduction in total K+ current amplitude, recorded with a 500 ms depolarizing pulse duration, to +50 mV from a holding potential of -80 mV. We tested the involvement of the sGC/cGMP/PKG signaling pathway by using specific PKG inhibitor KT 5823, potent sGC inhibitor NS 2028, and specific sGC agonist BAY 41-8543. The obtained data confirmed that only sGC participated in the IFN-γ-mediated BKCa channel modulation, which was mediated further by PKA. This study represents first evidence about the participation of the IFN-γ in the mechanisms responsible for BKCa modulation in HCFs. We also believe that this process occurs via negative crosstalk between the PKG- and PKA-associated pathways.
Collapse
Affiliation(s)
- M V Mitrokhin
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia
| | - V Kalsin
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - O Kamkina
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia
| | - I Babkina
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - A Zotov
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - V A Troitskiy
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - M I Mladenov
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia; Faculty of Natural Sciences and Mathematics, Institute of Biology, "Ss. Cyril and Methodius" University, P.O. Box 162, 1000 Skopje, Macedonia.
| | - G A Kamkin
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia
| |
Collapse
|
7
|
Shim AL, Mitrokhin VM, Kazanski VE, Mladenov MI, Kamkin AG. Discrete Stretch Eliminates Electrophysiological Dose-Dependent Effects of Nitric Oxide Donor SNAP in Rat Atrium. Bull Exp Biol Med 2017; 163:705-709. [PMID: 29063314 DOI: 10.1007/s10517-017-3885-9] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Indexed: 02/02/2023]
Abstract
Depolarization of cardiomyocytes triggered by stretch and activation of mechanically gated ion channels can lead to serious arrhythmias. However, stretch-induced signaling activating these channels remain little studied. This study tested the hypothesis on implication of NO in shaping the electrical abnormalities provoked by stretch of the right atrial myocardium in rat via a mechanism engaging a signaling cascade, where NO plays a significant role. This approach showed that in isolated right atrial preparation, NO donor SNAP induces the electrical abnormalities similar to those provoked by stretch, and the latter results from activation of NO synthase.
Collapse
Affiliation(s)
- A L Shim
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - V M Mitrokhin
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia.
| | - V E Kazanski
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - M I Mladenov
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A G Kamkin
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| |
Collapse
|
8
|
Shim AL, Mitrokhin VM, Gorbacheva LR, Savinkova IG, Pustovit KB, Mladenov MI, Kamkin AG. Kinetics of Mechanical Stretch-Induced Nitric Oxide Production in Rat Ventricular Cardiac Myocytes. Bull Exp Biol Med 2017; 163:583-585. [PMID: 28948553 DOI: 10.1007/s10517-017-3853-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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: 11/02/2016] [Indexed: 11/30/2022]
Abstract
Discrete mechanical stretch of isolated spontaneously contracting cardiac myocytes was employed to examine the kinetics of NO production in these cells. NO oscillations were detected with fluorescent dye 4-amino-5-methylamino-2',7'-difluorofluorescein diacetate. The mechanisms underlying stretch-induced changes in NO concentration remain unclear and further studies are needed to evaluate the role of NO oscillation in the regulation of cardiomyocyte function.
Collapse
Affiliation(s)
- A L Shim
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - V M Mitrokhin
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia.
| | - L R Gorbacheva
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - I G Savinkova
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - K B Pustovit
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - M I Mladenov
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A G Kamkin
- Department of Physiology, N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia
| |
Collapse
|
9
|
Abstract
The role of cytokines as regulators of stretch-related mechanisms is of special importance since mechano-sensitivity plays an important role in a wide variety of biological processes. Here, we elucidate the influence of cytokine application on mechano-sensitivity and mechano-transduction. The atrial myocardial stretch induces production of interleukin (IL)-2, IL-6, IL-13, IL-17A, and IL-18 with exception of tumor necrosis factor α (TNF-α), IL-1β, and vascular endothelial growth factor B (VEGF-B). Positive ionotropic effect was specific for VEGF-B, negative ionotropic effects were specific for TNF-α, IL-1β, IL-2, IL-6, IL-13, IL-17A and IL-18, while IL-1α doesn't show direct ionotropic effect. The IL-2, IL-6, IL-17A, IL-18, and VEGF-B cause elongation of the APD, in comparison with the reduced APD caused by the IL-13. The TNF-α, IL-1β, and IL-18 influences L-type Ca2+ channels, IL-2 has an inhibitory effect on the fast Na+ channels while IL-17A and VEGF-B were specific for Kir channels. With exception of the IL-1α, IL-2, and VEGF-B, all analyzed cytokines include nitric oxide dependent signaling with resultant combined effects on mechano-gated and Ca2+ channels. The relationships between these pathways and the time-dependence of their activation are of important considerations in the evaluation of cytokine-induced electrical abnormality, specific for cardiac dysfunctions. In general, the discussion presented in this review covers research devoted to counterbalance between different cytokines in the regulation of stretch-induced effects in rat atrial myocardium. ABBREVIATIONS APs: action potentials; APD25: action potential durations to 25% of re-polarization; APD50: action potential durations to 50% of repolarization; APD90: action potential durations to 90% of repolarization; MGCs: mechanically gated channels.
Collapse
Affiliation(s)
- V Kazanski
- a Department of Fundamental and Applied Physiology , Russian National Research Medical University , Moscow , Russia
| | - V M Mitrokhin
- a Department of Fundamental and Applied Physiology , Russian National Research Medical University , Moscow , Russia
| | - M I Mladenov
- a Department of Fundamental and Applied Physiology , Russian National Research Medical University , Moscow , Russia.,b Faculty of Natural Sciences and Mathematics, Institute of Biology , "Ss. Cyril and Methodius" University , Skopje , Macedonia
| | - A G Kamkin
- a Department of Fundamental and Applied Physiology , Russian National Research Medical University , Moscow , Russia
| |
Collapse
|
10
|
Shim AL, Aksyonov AA, Mitrokhin VM, Lovchikova IB, Konoplyannikov MA, Konev AV, Zotov AS, Ovchinnikov RS, Antova E, Mladenov MI, Kamkin A. Serum interleukin-6: Association with circulating cytokine serum levels in patients with sinus arrhythmia and patients with coronary artery disease. Cell Immunol 2016; 310:178-183. [PMID: 27633331 DOI: 10.1016/j.cellimm.2016.09.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 07/28/2016] [Accepted: 09/08/2016] [Indexed: 11/16/2022]
Abstract
In this study, we were focused on the differences between certain circulating cytokine levels in patients with or without sinus arrhythmia, according to the median IL-6 level. All patients were stable with regards to symptoms and therapy for at least one month prior to the measurements conducted within this study.Exclusion criteria were: patients with sleep apnea, asthma, respiratory insufficiency of any genesis, active infection, allergy, inflammatory diseases, cancer, diabetes of any type and treatment with anti-inflammatory drugs. The study was approved by the Institutional Review Board. All recruited patients gave their verbal and written consent for participation in the study. The study group consisted of 74 patients divided into two groups: with (38) and without sinus arrhythmia but with diagnosed coronary artery disease (36). Sinus arrhythmia was confirmed by 24h Holter monitoring. From all test parameters only cytokines IL-2, IL-8, IL-10, IL-17 and IL-18, showed statistically significant increasing in patients with statistically higher IL-6 levels. It is possible that IL-6 may not be a marker for the selection of patients with sinus arrhythmia or coronary artery disease. The findings indicate that IL-6 represents a reliable indicator for increased expression of IL-2, IL-8, IL-10, IL-17 and IL-18 in patients with sinus arrhythmia or coronary artery disease. Further studies in a large number of patients would be necessary to confirm our observations.
Collapse
Affiliation(s)
- A L Shim
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia; Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia
| | - A A Aksyonov
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia
| | - V M Mitrokhin
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia.
| | - I B Lovchikova
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - M A Konoplyannikov
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - A V Konev
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - A S Zotov
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia
| | - R S Ovchinnikov
- Federal Scientific Clinical Center for Specialized Types of Medical Assistance and Medical Technologies for the Federal Medical and Biological Agency, Orekhoviy Boulevard 28, Moscow 115682, Russia; Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia
| | - E Antova
- Medical Faculty, University Clinic of Cardiology, "Ss. Cyril and Methodius" University, 1000 Skopje, Macedonia
| | - M I Mladenov
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia; Faculty of Natural Sciences and Mathematics, Institute of Biology, "Ss. Cyril and Methodius" University, P.O. Box 162, 1000 Skopje, Macedonia.
| | - A Kamkin
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Ostrovitjanova 1, Moscow 117997, Russia
| |
Collapse
|
11
|
Ovchinnikov RS, Mitrokhin VM, Mladenov MI. Effects of vascular endothelial growth factor-b on the bioelectric activity of rat atrial myocardium under normal conditions and during gradual stretching. J BIOL REG HOMEOS AG 2015; 29:835-840. [PMID: 26753644] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Using a microelectrode technique we studied the effects of vascular endothelial growth factor-B on the activity of rat atrial myocardium under normal conditions and after gradual stretching of the tissue. It was shown that vascular endothelial growth factor-B increased duration of the action potential only at the level of 90% re-polarization. Effects on the frequency and force of contraction were absent. The repetition frequency of the action potentials did not change. Close observation of the vascular endothelial growth factor-B-induced mechanisms and stretch-induced alteration in action potential durations to 90% of repolarization, confirmed the existence of a link between the examining growth factor-B and stretch induced mechanisms.
Collapse
Affiliation(s)
- R S Ovchinnikov
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Moscow, Russia
| | - V M Mitrokhin
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Moscow, Russia
| | - M I Mladenov
- Department of Fundamental and Applied Physiology, Russian National Research Medical University, Moscow, Russia
| |
Collapse
|
12
|
Gjorgievska ES, Nicholson JW, Apostolska SM, Coleman NJ, Booth SE, Slipper IJ, Mladenov MI. Interfacial properties of three different bioactive dentine substitutes. Microsc Microanal 2013; 19:1450-1457. [PMID: 24148964 DOI: 10.1017/s1431927613013573] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Three different bioactive materials suitable as dentine substitutes in tooth repair have been studied: glass-ionomer cement, particulate bioglass, and calcium-silicate cement. On 15 permanent human molars, Class V cavities were prepared and the bottom of each cavity was de-mineralized by an artificial caries gel. After the de-mineralization, the teeth were restored with: (1) Bioglass®45S5 and ChemFil® Superior; (2) Biodentine™ and ChemFil® Superior; and (3) ChemFil® Superior for a complete repair. The teeth were stored for 6 weeks in artificial saliva, then cut in half along the longitudinal axis: the first half was imaged in a scanning electron microscope (SEM) and the other half was embedded in resin and analyzed by SEM using energy-dispersive X-ray analysis. The glass-ionomer and the bioglass underwent ion exchange with the surrounding tooth tissue, confirming their bioactivity. However, the particle size of the bioglass meant that cavity adaptation was poor. It is concluded that smaller particle size bioglasses may give more acceptable results. In contrast, both the glass-ionomer and the calcium-silicate cements performed well as dentine substitutes. The glass-ionomer showed ion exchange properties, whereas the calcium silicate gave an excellent seal resulting from its micromechanical attachment.
Collapse
Affiliation(s)
- Elizabeta S Gjorgievska
- Faculty of Dental Medicine, University "Sts Cyril and Methodius" Skopje 1000, Republic of Macedonia
| | | | | | | | | | | | | |
Collapse
|
13
|
Dimitrova DZ, Dimitrov SD, Iliev I, Mladenov MI, Hristov KL, Mihov DN, Duridanova DB, Gagov HS. Ghrelin signaling in human mesenteric arteries. J Physiol Pharmacol 2010; 61:383-390. [PMID: 20814065] [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] [Received: 07/10/2009] [Accepted: 07/15/2010] [Indexed: 05/29/2023]
Abstract
The hypothesis is that the ghrelin signal pathway consists of new participants including a local second mediator in human mesenteric arteries. The contractile force of isometric artery preparations was measured using a wire-myograph. Whole-cell patch clamp experiments were performed on freshly isolated single smooth muscle cells from the same tissue. After the addition of ghrelin (100 nmol) the outward potassium currents conducted through iberiotoxin-sensitive calcium-activated potassium channels with a large conductance were almost entirely abolished. The effect of ghrelin on potassium currents was insensitive to selective inhibitors of cAMP-dependent protein kinase and soluble guanylate cyclase, but was eliminated in the presence of des-octanoyl ghrelin and O-(octahydro-4,7-methano-1H-inden-5-yl) carbonopotassium dithioate (D-609). Ghrelin dose-dependently increased the force of contraction of native, endothelium-denuded and mostly of endothelium-denuded and treated with tetrodotoxin human mesenteric arteries preconstricted with 1 nmol endothelin-1. This effect of ghrelin was blocked when the bath solution contained 1,4-diamino-2,3-dicyano-1,4-bis(2-aminophenylthio)butadiene (U0126), 4-amino-5-(4-methylphenyl)-7-(t-butyl) pyrazolo[3,4-d] pyrimidine (PP2), D-609, 2-[1-(3-dimethylaminopropyl)indol-3-yl]-3-(indol-3-yl) maleimide (GF109203x), pertussis toxin, 2-aminoethyl diphenylborinate (2-APB), indomethacin, (5Z,13E)-(9S,11S,15R)-9,15,Dihydroxy-11-fluoro-15-(2-indanyl)-16,17,18,19,20,pentanor-5,13-prostadienoic acid (AL-8810) - a non-selective prostanoid receptor antagonist, 5-(4-Chlorophenyl)-1-(4-methoxyphenyl)-3-trifluoromethyl pyrazolo (SC-560) - a selective cyclooxygenase 1 inhibitor, ozagrel - a selective thromboxane A(2) synthase inhibitor or T prostanoid receptor antagonist GR32191B. It is concluded that ghrelin increases the force of contraction of human mesenteric arteries by a novel mechanism that involves Src kinase, mitogen-activated protein kinase kinase (MEK), cyclooxygenase 1 and T prostanoid receptor agonist, most probably thromboxane A(2).
Collapse
Affiliation(s)
- D Z Dimitrova
- Institute of Biophysics, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | | | | | | | | | | | | | | |
Collapse
|
14
|
Leuner K, Heiser JH, Derksen S, Mladenov MI, Fehske CJ, Schubert R, Gollasch M, Schneider G, Harteneck C, Chatterjee SS, Müller WE. Simple 2,4-diacylphloroglucinols as classic transient receptor potential-6 activators--identification of a novel pharmacophore. Mol Pharmacol 2009; 77:368-77. [PMID: 20008516 DOI: 10.1124/mol.109.057513] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The naturally occurring acylated phloroglucinol derivative hyperforin was recently identified as the first specific canonical transient receptor potential-6 (TRPC6) activator. Hyperforin is the major antidepressant component of St. John's wort, which mediates its antidepressant-like properties via TRPC6 channel activation. However, its pharmacophore moiety for activating TRPC6 channels is unknown. We hypothesized that the phloroglucinol moiety could be the essential pharmacophore of hyperforin and that its activity profile could be due to structural similarities with diacylglycerol (DAG), an endogenous nonselective activator of TRPC3, TRPC6, and TRPC7. Accordingly, a few 2-acyl and 2,4-diacylphloroglucinols were tested for their hyperforin-like activity profiles. We used a battery of experimental models to investigate all functional aspects of TRPC6 activation, including ion channel recordings, Ca(2+) imaging, neurite outgrowth, and inhibition of synaptosomal uptake. Phloroglucinol itself was inactive in all of our assays, which was also the case for 2-acylphloroglucinols. For TRPC6 activation, the presence of two symmetrically acyl-substitutions with appropriate alkyl chains in the phloroglucinol moiety seems to be an essential prerequisite. Potencies of these compounds in all assays were comparable with that of hyperforin for activating the TRPC6 channel. Finally, using structure-based modeling techniques, we suggest a binding mode for hyperforin to TRPC6. Based on this modeling approach, we propose that DAG is able to activate TRPC3, TRPC6, and TRPC7 because of higher flexibility within the chemical structure of DAG compared with the rather rigid structures of hyperforin and the 2,4-diacylphloroglucinol derivatives.
Collapse
Affiliation(s)
- K Leuner
- Institute of Pharmacology, Goethe University, Biocenter N260, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Mladenov MI, Hristov KL, Dimitrova DZ, Schubert R, Lubomirov LT, Gjorgoski IK, Duridanova DB, Gagov HS. Ghrelin signalling in guinea-pig femoral artery smooth muscle cells. Acta Physiol (Oxf) 2008; 194:195-206. [PMID: 18577183 DOI: 10.1111/j.1748-1716.2008.01880.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [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: 01/19/2023]
Abstract
AIM Our aim was to study the new signalling pathway of ghrelin in the guinea-pig femoral artery using the outward I(K) as a sensor. METHODS Whole-cell patch-clamp experiments were performed on single smooth muscle cells, freshly isolated from the guinea-pig femoral artery. The contractile force of isometric preparations of the same artery was measured using a wire-myograph. RESULTS In a Ca2+- and nicardipine-containing external solution, 1 mmol L(-1) tetraethylammonium reduced the net I(K) by 49 +/- 7%. This effect was similar and not additive to the effect of the specific BK(Ca) channel inhibitor iberiotoxin. Ghrelin (10(-7) mol L(-1)) quickly and significantly reduced the amplitudes of tetraethylammonium- and iberiotoxin-sensitive currents through BK(Ca) channels. The application of 5 x 10(-6) mol L(-1) desacyl ghrelin did not affect the amplitude of the control I(K) but it successfully prevented the ghrelin-induced I(K) decrease. The effect of ghrelin on I(K) was insensitive to selective inhibitors of cAMP-dependent protein kinase, soluble guanylyl cyclase, cGMP-dependent protein kinase or a calmodulin antagonist, but was effectively antagonized by blockers of BK(Ca) channels, phosphatidylinositol-phospholipase C, phosphatidylcholine-phospholipase C, protein kinase C, SERCA, IP(3)-induced Ca2+ release and by pertussis toxin. The ghrelin-induced increase in the force of contractions was blocked when iberiotoxin (10(-7) mol L(-1)) was present in the bath solution. CONCLUSIONS Ghrelin reduces I(K(Ca)) in femoral artery myocytes by a mechanism that requires activation of Galpha(i/o)-proteins, phosphatidylinositol phospholipase C, phosphatidylcholine phospholipase C, protein kinase C and IP(3)-induced Ca2+ release.
Collapse
MESH Headings
- Animals
- Dose-Response Relationship, Drug
- Endothelin-1/pharmacology
- Femoral Artery/drug effects
- Femoral Artery/metabolism
- Femoral Artery/physiology
- Ghrelin/pharmacology
- Guinea Pigs
- Intermediate-Conductance Calcium-Activated Potassium Channels/drug effects
- Intermediate-Conductance Calcium-Activated Potassium Channels/metabolism
- Male
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/physiology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/physiology
- Patch-Clamp Techniques
- Peptides/pharmacology
- Phosphoinositide Phospholipase C/physiology
- Protein Kinase C/physiology
- Signal Transduction/drug effects
- Signal Transduction/physiology
- Type C Phospholipases/physiology
- Vasoconstriction/drug effects
- Vasoconstriction/physiology
Collapse
Affiliation(s)
- M I Mladenov
- Department of Ion Channels, Institute of Biophysics, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Mladenov MI, Hristov KL, Duridanova DB. Ghrelin suppression of potassium currents in smooth muscle cells of human mesenteric artery. Gen Physiol Biophys 2006; 25:333-8. [PMID: 17197731] [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: 05/13/2023]
Abstract
Ghrelin is a 28-amino acid peptide hormone which modulates many physiological functions including cardiovascular homeostasis. Here we report some novel findings about the action of ghrelin on smooth muscle cells (SMC) freshly isolated from human mesenteric arteries. Ghrelin (10(-7) mol/l) significantly suppressed the iberiotoxin-blockable component of potassium currents (I(K)) and depolarized the cell membrane, while having no effect on Ca(2+) currents. Inhibition of inositol-trisphosphate (IP(3))-activated Ca(2+) release channels, depletion of sarcoplasmic reticulum (SR) Ca(2+) stores, blockade of phospholipase D (PLD) or protein kinase C (PKC) each abolished the effect of ghrelin on I(K), while the inhibition of phospholipase C (PLC) did not. These data imply that in human mesenteric artery SMC ghrelin suppresses I(K) via PLD, PKC and SR Ca(2+)-dependent signaling pathway.
Collapse
Affiliation(s)
- M I Mladenov
- Institute of Biology, Faculty of Natural Sciences and Mathematics, Sv. Kiril i Metodij University, Arhimedova 6, P.O.Box 162, Skopje, Republic of Macedonia.
| | | | | |
Collapse
|