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Khmil NV, Mosencov AA, Shigaeva MI, Mironova GD. A Comparison of Methods for Estimating the Activity of the ATP-Sensitive Potassium Channel in Mitochondria Based on the Effect of ATP. Biophysics (Nagoya-shi) 2019. [DOI: 10.1134/s0006350919050099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Rozova EV, Mankovskaya IN, Belosludtseva NV, Khmil NV, Mironova GD. Uridine as a protector against hypoxia-induced lung injury. Sci Rep 2019; 9:9418. [PMID: 31263219 PMCID: PMC6602925 DOI: 10.1038/s41598-019-45979-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 06/20/2019] [Indexed: 11/30/2022] Open
Abstract
The effect of the activation of the mitochondrial ATP-dependent potassium channel (mitoKATP) on the ultrastructure of rat lung in acute hypoxic hypoxia (7% of oxygen in nitrogen, exposure 30 min) was studied. It was shown that uridine, a precursor of the mitoKATP activator UDP, exerted a protective effect against hypoxic damage to the lung. The administration of uridine to animals prior to hypoxia decreased the number of mitochondria with altered ultrastructure and prevented the hypoxia-induced mitochondrial swelling. Uridine also protected the epithelial, interstitial and endothelial layers of the air-blood barrier from the hypoxia-induced hyperhydration. The protective action of uridine against hypoxia-induced lung injury was eliminated by the selective blocker of mitoKATP 5-hydroxydecanoate. These data suggest that one of the mechanisms of the positive effect of uridine is related to the activation of the mitoKATP channel, which, according to the literature and our data, is involved in the protection of tissues from hypoxia and leads to adaptation to it. A possible role of uridine in the maintenance of the mitochondrial structure upon hypoxia-induced lung injury and the optimization of oxygen supply of the organism is discussed.
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Affiliation(s)
- Ekaterina V Rozova
- Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Bogomoletz street 4, 01024, Kiev, Ukraine
| | - Irina N Mankovskaya
- Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Bogomoletz street 4, 01024, Kiev, Ukraine
| | - Natalia V Belosludtseva
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya street 3, 142290, Pushchino, Moscow region, Russia
| | - Natalya V Khmil
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya street 3, 142290, Pushchino, Moscow region, Russia
| | - Galina D Mironova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya street 3, 142290, Pushchino, Moscow region, Russia.
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Mironova GD, Khrenov MO, Talanov EY, Glushkova OV, Parfenyuk SB, Novoselova TV, Lunin SM, Belosludtseva NV, Novoselova EG, Lemasters JJ. The role of mitochondrial KATP channel in anti-inflammatory effects of uridine in endotoxemic mice. Arch Biochem Biophys 2018; 654:70-76. [PMID: 30009781 DOI: 10.1016/j.abb.2018.07.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 07/04/2018] [Accepted: 07/09/2018] [Indexed: 11/16/2022]
Abstract
In this study, we examined the effects of uridine on plasma cytokine levels, heat shock protein (HSP) 72 expression, and nuclear factor (NF)-κB signaling in spleen lymphocytes after exposure of male BALB/c mice to Escherichia coli lipopolysaccharide (LPS). Mice were treated with uridine (30 mg/kg body weight, intraperitoneal injection [i.p.]) or saline solution of LPS (2.5 mg/kg, i. p.). Endotoxin increased plasma levels of tumor necrosis factor-α, interferon-γ, interleukin (IL)-1, IL-2, and IL-6 by 2.1-, 1.9-, 1.7-, 1.6-, and 2.3-fold, respectively. Prior treatment with uridine prevented LPS-induced increases in all studied cytokines. In splenic lymphocytes, LPS treatment increased the expression of HSP 72 by 2.4-fold, whereas preliminary treatment with uridine completely prevented this effect. LPS also activated NF-κB signaling in splenic lymphocytes, and uridine decreased NF-κB pathway activity. Inhibitory analysis showed that the mechanism of uridine action was associated with the formation of the UDP-metabolic activator of the mitochondrial ATP-dependent potassium channel (mitoKATP) and the UTP-activator of glycogen synthesis in the tissues. A specific inhibitor of mitoKATP, 5-hydroxydecanoate (5 mg/kg), and an inhibitor of glycogen synthesis, galactosamine (110 mg/kg), prevented the effects of uridine. Thus, uridine itself or uridine phosphates, which increased after uridine treatment, appeared to inhibit pro-inflammatory responses induced by LPS application. Overall, these findings demonstrated that the mechanisms mediating the effects of uridine were regulated by activation of glycogen synthesis and opening of the mitoKATP, which in turn increased the energy potential of the cell and reduced oxidative stress.
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Affiliation(s)
- Galina D Mironova
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia; Pushchino State Institute of Natural Sciences, Pushchino, Moscow Region, 142290, Russia.
| | - Maxim O Khrenov
- Institute of Cell Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | - Eugeny Yu Talanov
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | - Olga V Glushkova
- Institute of Cell Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | | | | | - Sergey M Lunin
- Institute of Cell Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | - Natalia V Belosludtseva
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia; Pushchino State Institute of Natural Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Elena G Novoselova
- Institute of Cell Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | - John J Lemasters
- Departments of Drug Discovery & Biomedical Sciences and Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC, SC 29425, USA
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Venediktova NI, Gorbacheva OS, Belosludtseva NV, Fedotova IB, Surina NM, Poletaeva II, Kolomytkin OV, Mironova GD. Energetic, oxidative and ionic exchange in rat brain and liver mitochondria at experimental audiogenic epilepsy (Krushinsky-Molodkina model). J Bioenerg Biomembr 2017; 49:149-158. [PMID: 28070860 DOI: 10.1007/s10863-016-9693-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 12/30/2016] [Indexed: 01/02/2023]
Abstract
The role of brain and liver mitochondria at epileptic seizure was studied on Krushinsky-Molodkina (KM) rats which respond to sound with an intensive epileptic seizure (audiogenic epilepsy). We didn't find significant changes in respiration rats of brain and liver mitochondria of KM and control rats; however the efficiency of АТР synthesis in the KM rat mitochondria was 10% lower. In rats with audiogenic epilepsy the concentration of oxidative stress marker malondialdehyde in mitochondria of the brain (but not liver) was 2-fold higher than that in the control rats. The rate of H2O2 generation in brain mitochondria of КМ rats was twofold higher than in the control animals when using NAD-dependent substrates. This difference was less pronounced in liver mitochondria. In KM rats, the activity of mitochondrial ATP-dependent potassium channel was lower than in liver mitochondria of control rats. The comparative study of the mitochondria ability to retain calcium ions revealed that in the case of using the complex I and complex II substrates, permeability transition pore is easier to trigger in brain and liver mitochondria of KM and КМs rats than in the control ones. The role of the changes in the energetic, oxidative, and ionic exchange in the mechanism of audiogenic epilepsy generation in rats and the possible correction of the epilepsy seizures are discussed.
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Affiliation(s)
- Natalya I Venediktova
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia.
| | - Olga S Gorbacheva
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | - Natalia V Belosludtseva
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | - Irina B Fedotova
- Biology Department, Laboratory for Physiology and Genetics of Behavior, Lomonosov Moscow State University, Leninskie Gory, 1, Build. 12, Moscow, 119992, Russia
| | - Natalia M Surina
- Biology Department, Laboratory for Physiology and Genetics of Behavior, Lomonosov Moscow State University, Leninskie Gory, 1, Build. 12, Moscow, 119992, Russia
| | - Inga I Poletaeva
- Biology Department, Laboratory for Physiology and Genetics of Behavior, Lomonosov Moscow State University, Leninskie Gory, 1, Build. 12, Moscow, 119992, Russia
| | - Oleg V Kolomytkin
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
| | - Galina D Mironova
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow Region, 142290, Russia
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Akopova O, Nosar V, Gavenauskas B, Bratus L, Kolchinskaya L, Mankovska I, Sagach V. The effect of atp-dependent potassium uptake on mitochondrial functions under acute hypoxia. J Bioenerg Biomembr 2016; 48:67-75. [PMID: 26739597 DOI: 10.1007/s10863-015-9642-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 12/28/2015] [Indexed: 12/22/2022]
Abstract
The opening of mitochondrial K(+) АТР-channel (mtK(+) АТР-channel) is supposed to be important in the modulation of mitochondrial functions under hypoxia, but the underlying mechanisms have not been clarified yet. The aim of this work was to study the effect of acute hypoxia on mtK(+) АТР-channel activity and to estimate the contribution of the channel in the modulation of mitochondrial functions. MtK(+) АТР-channel activity was assessed polarographically from the rate of State 4 respiration and by potentiometric monitoring of potassium efflux from deenergized mitochondria. It was shown that hypoxia reliably increased mtK(+) АТР-channel activity, which resulted in the changes of respiration rates (increase of State 4 and suppression of State 3 respiration), uncoupling (the decrease of respiratory control ratio) and suppression of phosphorylation. These effects were well mimicked by mtK(+) АТР-channel opener diazoxide (DZ) in isolated rat liver mitochondria. MtK(+) АТР-channel opening in vitro suppressed phosphorylation too, but increased phosphorylation efficiency, while mtK(+) АТР-channel blockers reduced it dramatically. The correlation was established between mtK(+) АТР-channel activity and the endurance of the rats to physical training under hypoxia. Hypoxia improved physical endurance, but treatment by mtK(+) АТР-channel blockers glibenklamide and 5-hydroxydecanoate (5-HD) prior to hypoxia strongly reduced both the channel activity and the endurance limits. This was in accord with the observation that under glibenklamide and 5-HD administration hypoxia failed to restore mtK(+) АТР-channel activity. Based on the experiments, we came to the conclusion that mtK(+) АТР-channel opening played a decisive role in the regulation of energy metabolism under acute hypoxia via the modulation of phosphorylation system in mitochondria.
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Affiliation(s)
- Olga Akopova
- Circulation Department, Bogomoletz Institute of Physiology, NAS of Ukraine, Bogomoletz str. 4, 01601, Kiev, Ukraine.
| | - Valentina Nosar
- Hypoxic States Research Department, Bogomoletz Institute of Physiology, NAS of Ukraine, Kiev, Ukraine
| | - Bronislav Gavenauskas
- Hypoxic States Research Department, Bogomoletz Institute of Physiology, NAS of Ukraine, Kiev, Ukraine
| | - Larissa Bratus
- Hypoxic States Research Department, Bogomoletz Institute of Physiology, NAS of Ukraine, Kiev, Ukraine
| | - Liudmila Kolchinskaya
- Circulation Department, Bogomoletz Institute of Physiology, NAS of Ukraine, Bogomoletz str. 4, 01601, Kiev, Ukraine
| | - Iryna Mankovska
- Hypoxic States Research Department, Bogomoletz Institute of Physiology, NAS of Ukraine, Kiev, Ukraine
| | - Vadim Sagach
- Circulation Department, Bogomoletz Institute of Physiology, NAS of Ukraine, Bogomoletz str. 4, 01601, Kiev, Ukraine
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