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Jašová M, Kancirová I, Muráriková M, Farkašová V, Waczulíková I, Ravingerová T, Ziegelhöffer A, Ferko M. Stimulation of mitochondrial ATP synthase activity - a new diazoxide-mediated mechanism of cardioprotection. Physiol Res 2017; 65 Suppl 1:S119-27. [PMID: 27643934 DOI: 10.33549/physiolres.933411] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Pharmacological preconditioning by diazoxide and a model of experimental streptozotocin-induced acute diabetes mellitus (STZ-DM) provided similar levels of cardioprotection assessed as limiting myocardial infarct size. The aim was to explore the possibility of existence of another in vitro mechanism, which could be contributory to cardioprotection mediated by diazoxide treatment. Mitochondrial membrane fluidity and ATP synthase activity in isolated heart mitochondria were determined under the influence of two factors, STZ-DM condition and treatment with diazoxide. Both factors independently increased the ATP synthase activity (p<0.05), as no interaction effect was observed upon the combination of STZ-DM with diazoxide. On the other hand, the mitochondrial membrane fluidity was significantly increased by STZ-DM only; no significant main effect for diazoxide was found. Based on the results from measurements of enzyme kinetics, we assume a direct interaction of diazoxide with the molecule of ATP synthase stimulated its activity by noncompetitive activation. Our present work revealed, for the first time, that cardioprotection induced by diazoxide may not be caused exclusively by mitochondrial K(ATP) opening, but presumably also by a direct interaction of diazoxide with ATP synthase, although the mechanisms for achieving this activation cannot be fully delineated.
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Affiliation(s)
- M Jašová
- Institute for Heart Research, Centre of Excellence of SAS, NOREG, Slovak Academy of Sciences, Bratislava, Slovak Republic.
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Kazmierczak PA, Dobaczewski MP, Przygodzki T, Carsky J, Watala C. β-Resorcylidene aminoguanidine (RAG) dilates coronary arteries in an endothelium-independent manner. Pharmacol Rep 2015; 67:631-5. [PMID: 25933980 DOI: 10.1016/j.pharep.2015.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 01/08/2015] [Accepted: 01/09/2015] [Indexed: 10/24/2022]
Abstract
BACKGROUND β-Resorcylidene aminoguanidine (RAG), a highly reactive derivative of aminoguanidine, possesses antithrombotic activity which involves the activation of the vascular COX-2/PGI2 pathway. This endothelium-dependent effect suggests that RAG may demonstrate vasomotor activity in arterial vessels. The aim of the present study was to investigate a possible vasoactive action of RAG in coronary arteries of rat heart. METHODS Isolated rat hearts were perfused in the Langendorff model. To investigate the dose dependency of the effect of RAG on coronary flow, the hearts were perfused with RAG at increasing concentrations. Mechanisms of RAG-mediated vasodilation were subsequently tested using selective inhibitors of the endothelium-dependent and endothelium-independent mechanisms responsible for regulation of vascular tone. RESULTS RAG dilated coronary arteries at concentrations above 10(-5)mol/l. Inhibition of the endothelium-dependent mechanism of vasodilation by NG-nitro-L-arginine methyl ester, indomethacin and aminobenzotriazole did not affect RAG-mediated vasodilation. Other compounds also had no impact on the vasodilating effect of RAG: the NO-dependent guanylate cyclase inhibitor - 1H-[1,2,4]oxadiazolo[4,3]quinoxalin-1-one, the cAMP-dependent protein kinase inhibitor - PKAi, and the K(+) channel blockers - glibenclamide, tetraethylammonium, charybdotoxin, and apamin. CONCLUSIONS RAG is a strong vasodilator that exerts its effect via endothelium-independent mechanisms.
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Affiliation(s)
- Piotr A Kazmierczak
- Department of Haemostatic Disorders, Medical University of Lodz, Łódź, Poland; Department of Cardiosurgery, Polish Mother's Memorial Hospital - Research Institute, Łódź, Poland.
| | - Marcin P Dobaczewski
- Department of Haemostatic Disorders, Medical University of Lodz, Łódź, Poland; Department of Medicine, Baylor College of Medicine, Houston, USA
| | - Tomasz Przygodzki
- Department of Haemostatic Disorders, Medical University of Lodz, Łódź, Poland
| | - Jozef Carsky
- Department of Medical Chemistry, Biochemistry and Clinical Biochemistry, Comenius University, Faculty of Medicine, Bratislava, Slovakia
| | - Cezary Watala
- Department of Haemostatic Disorders, Medical University of Lodz, Łódź, Poland
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Ozdemir N, Inkaya E, Sarıpınar E, Akyüz L, Ilhan IÖ, Aydın S, Dinçer M, Büyükgüngör O. Synthesis, spectroscopic (FT-IR/NMR) characterization, X-ray structure and DFT studies on (E)-2-(1-phenylethylidene) hydrazinecarboximidamide nitrate hemimethanol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 114:175-182. [PMID: 23770506 DOI: 10.1016/j.saa.2013.05.039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Revised: 05/13/2013] [Accepted: 05/14/2013] [Indexed: 06/02/2023]
Abstract
The title molecular salt, (E)-2-(1-phenylethylidene) hydrazinecarboximidamide nitrate hemimethanol C9H13N4(+)·NO3(-)·0.5CH4O, was synthesized and characterized by elemental analysis, FT-IR and NMT spectroscopies, and single-crystal X-ray diffraction technique. Quantum chemical calculations were performed to study the molecular and spectroscopic properties of the title compound, and the results were compared with the experimental findings. The calculated results show that the optimized geometry can well reproduce the crystal structure parameters, and the theoretical vibrational frequencies and GIAO (1)H and (13)CNMR chemical shifts show good agreement with experimental values. The dipole moment, linear polarizability and first hyperpolarizability values were also computed. The linear polarizabilities and first hyper polarizabilities of the studied molecule indicate that the compound is a good candidate of nonlinear optical materials. On the basis of the thermodynamic properties of the title compound at different temperatures have been calculated, revealing the correlations between standard heat capacities (C) standard entropies (S), and standard enthalpy changes (H) and temperatures.
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Affiliation(s)
- Namık Ozdemir
- Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, 55139 Samsun, Turkey.
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Ziegelhöffer A, Waczulíková I, Ferko M, Šikurová L, Mujkošová J, Ravingerová T. Involvement of membrane fluidity in endogenous protective processes running on subcellular membrane systems of the rat heart. Physiol Res 2013; 61:S11-21. [PMID: 23130895 DOI: 10.33549/physiolres.932361] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Membrane fluidity is a widely recognized biophysical variable that provides information about structural organization of the subcellular membranes exhibiting physical characteristics of liquid crystals. The term "fluidity" reflects in this case the tightness in packing of acyl parts of the membrane phospholipid molecules, a feature that may influence considerably the molecular mobility and via that also the sensitivity and reactivity of membrane-bound transporters, receptors and enzyme systems. Data presented in this review are aimed to demonstrate the substantial role of changes in membrane fluidity occurring in the processes associated with endogenous protection observed in cardiac sarcolemma and mitochondria in diverse pathologies, particularly in diabetes and hypertension.
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Affiliation(s)
- A Ziegelhöffer
- Institute for Heart Research, Slovak Academy of Sciences and Centre of Excellence, Slovak Academy of Sciences, NO REG, Bratislava, Slovakia.
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Vignini A, Moroni C, Nanetti L, Raffaelli F, Cester A, Gabrielli O, Cherubini V, Mazzanti L. Alterations of platelet biochemical and functional properties in newly diagnosed type 1 diabetes: a role in cardiovascular risk? Diabetes Metab Res Rev 2011; 27:277-85. [PMID: 21309054 DOI: 10.1002/dmrr.1173] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND The involvement of platelets in the pathogenesis of diabetic vascular complications is supported by several studies. Type 1 diabetic (T1D) platelets show increased adhesiveness and aggregation related to a modification of nitric oxide synthase activity. Moreover, different cell types from diabetic patients showed a decreased membrane Na(+) /K(+) -ATPase activity, which might be involved in diabetic complications. The aim of this study was to investigate whether T1D at onset is able to induce alterations of platelet physicochemical and functional properties and whether these changes are affected by hyperglycaemia. METHODS The study was performed on 50 young subjects: 30 patients (1-14 years) affected by T1D and 20 age- and gender-matched healthy subjects. We analyzed platelet membrane fluidity by fluorescent anisotropy of 1-(4-trimethylaminophenyl)-6-phenyl-1,3,5-hexatriene and 1,6-diphenyl-1,3,5-hexatriene, Na(+) /K(+) -ATPase, nitric oxide, and peroxynitrite production. RESULTS In T1D subjects, we observed an increased fluidity in the plasma membrane outer part and greater rigidity in the internal part compared with that in controls. Na(+) /K(+) -ATPase activity and nitric oxide levels were significantly reduced, while peroxynitrite production was increased compared with that in controls. Moreover, correlations found between the above parameters were correlated with fasting glycaemia and haemoglobin A(1c). CONCLUSIONS T1D patients exhibit structural and functional modifications of platelet membrane properties and alterations of nitric oxide metabolism due to diabetes per se and not to chronic hyperglycaemia, insulin therapy, or ageing. These results support the hypothesis that oxidative attack could be an important early event in the pathogenesis of diabetic complications.
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Affiliation(s)
- Arianna Vignini
- Department of Biochemistry, Biology and Genetics, School of Medicine, Polytechnic University of Marche, Via Ranieri 65, Ancona, Italy.
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Pérez-Hernández IH, Avendaño-Flores YS, Mejía-Zepeda R. Analysis of the membrane fluidity of erythrocyte ghosts in diabetic, spontaneously hypertensive rats. Acta Diabetol 2010; 47 Suppl 1:47-55. [PMID: 19404568 DOI: 10.1007/s00592-009-0120-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Accepted: 04/06/2009] [Indexed: 10/20/2022]
Abstract
Diabetes and hypertension are closely related diseases associated with changes in membrane fluidity. Here, we measured the membrane fluidity of erythrocyte ghosts from spontaneously hypertensive rats (SHR), with or without streptozotocin (STZ)-induced diabetes, at the ages of 1, 3 and 6 months, by introducing the use of the intramolecular excimer forming dipyrenylpropane (DPyP) in this model. Type 2 diabetes mellitus (T2DM) was induced in 48-h-old, newborn male SHR by intraperitoneal injection of STZ. We found lower excimer to monomer (I (e)/I (m)) DPyP ratios in diabetic SHR than in control SHR at 3 and 6 months old, indicating a decrease in membrane fluidity. Simultaneously, the composition of fatty acids was determined and it was found that the unsaturated to saturated fatty acids ratio (U/S) was compatible with changes in membrane fluidity. These results suggest that the change in fatty acid composition of erythrocyte ghosts contributes significantly to the decreased membrane fluidity detected with DPyP in diabetic SHR.
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Affiliation(s)
- Ismael H Pérez-Hernández
- Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Av de los Barrios No 1 Los Reyes Iztacala, CP 54090 Tlalnepantla, Estado de México, Mexico
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Resorcylidene aminoguanidine induces antithrombotic action that is not dependent on its antiglycation activity. Vascul Pharmacol 2009; 51:275-83. [PMID: 19635586 DOI: 10.1016/j.vph.2009.07.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Revised: 06/20/2009] [Accepted: 07/11/2009] [Indexed: 11/24/2022]
Abstract
There is good evidence supporting the notion that aminoguanidine(AG)-derived compounds prevent glycation/glycooxidation-dependent processes and therefore inhibit late diabetic complications. The aim of the present work was to analyse the antithrombotic action and antiglycation activity of beta-resorcylidene aminoguanidine (RAG) in comparison with another commonly used aminoguanidine (AG)-derived compound, pyridoxal aminoguanidine (PAG). In vitro RAG and PAG prevented exhaustive glycation and glycooxidation of BSA to a similar extent. However, merely RAG showed almost complete binding to sepharose-immobilized heparin, while PAG and other AG derivatives had much poorer affinities. In the model of in vivo thrombosis in Wistar rats with extracorporeal circulation RAG (i.v. 30 mg/kg), but not PAG, produced sustained (2 h) antithrombotic effect, which was abrogated by indomethacin (5 mg/kg) and rofecoxib (1 mg/kg). The 60-day treatment of streptozotocin-diabetic animals with RAG (p.o. 4 mg/kg) significantly decreased plasma concentration of a thromboxane B(2) and reduced whole blood platelet aggregability triggered by ADP or collagen. In conclusion, although RAG and PAG displayed similar antiglycation and antioxidation activities in vitro, only RAG showed antithrombotic activity in vivo that involved activation of COX-2/PGI(2) pathway. Our results indicate that designing novel RAG derivatives with optimal antithrombotic and antiglycation activities may prove useful to treat diabetic complications.
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Labieniec M, Przygodzki T, Čársky J, Malinska D, Rysz J, Watala C. Effects of resorcylidene aminoguanidine (RAG) on selected parameters of isolated rat liver mitochondria. Chem Biol Interact 2009; 179:280-7. [DOI: 10.1016/j.cbi.2008.11.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2008] [Revised: 11/08/2008] [Accepted: 11/10/2008] [Indexed: 10/21/2022]
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Vojtassák J, Cársky J, Danisovic L, Böhmer D, Blasko M, Braxatorisová T. Effect of pyridoxylidene aminoguanidine on human diploid cells B-HEF-2: in vitro cytotoxicity test and cytogenetic analysis. Toxicol In Vitro 2006; 20:868-73. [PMID: 16472966 DOI: 10.1016/j.tiv.2005.12.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2005] [Revised: 11/22/2005] [Accepted: 12/30/2005] [Indexed: 11/29/2022]
Abstract
BACKGROUND Pyridoxylidene aminoguanidine is an appropriate inhibitor of protein glycation, respectively formation of advanced glycation products, which are connected with mechanism of pathogenesis in chronic diabetic complications. Moreover, it was found that in comparison with aminoguanidine, pyridoxylidene aminoguanidine does not influence the level of vitamin B6 in liver and kidneys in vivo. The aim of this study was to test cytotoxic effect of pyridoxylidene aminoguanidine in vitro, in regard to its potential use as inhibitor of advance protein glycation in diabetic patients. METHODS The potential genotoxic activity of pyridoxylidene aminoguanidine in vitro was assessed by the micronucleus test and the karyological analysis. The direct contact method using diploid human cell line B-HEF-2 was performed to evaluate cytotoxicity. The concentrations of 5 x 10(-3), 2.5 x 10(-3) and 1 x 10(-3) ml/l were used in all tests. RESULTS Microscopic analysis did not proved any changes in morphology of exposed fibroblasts. The inhibitive effect of pyridoxylidene aminoguanidine was increased with rising concentration. The proliferative activity of exposed cells to concentrations of 1 x 10(-3), 2.5 x 10(-3), 5 x 10(-3) mol/l was inhibited approximately by 30%, 60% and 80%, respectively. The frequency of micronuclei and rate of numerical or structural aberrations was not increased. CONCLUSION Obtained results confirmed that pyridoxylidene aminoguanidine in selected concentrations has an inhibitive effect on the proliferation activity of exposed cells, but did not develop any cytotoxic effect on B-HEF-2 cells.
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Affiliation(s)
- Ján Vojtassák
- Comenius University in Bratislava, Faculty of Medicine, Institute of Medical Biology and Genetics, Sasinkova 4, 813 72 Bratislava, Slovak Republic
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Sreedhar AS, Mihály K, Pató B, Schnaider T, Steták A, Kis-Petik K, Fidy J, Simonics T, Maraz A, Csermely P. Hsp90 inhibition accelerates cell lysis. Anti-Hsp90 ribozyme reveals a complex mechanism of Hsp90 inhibitors involving both superoxide- and Hsp90-dependent events. J Biol Chem 2003; 278:35231-40. [PMID: 12842893 DOI: 10.1074/jbc.m301371200] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The 90 kDa heat shock protein, Hsp90, is an abundant molecular chaperone participating in the cytoprotection of eukaryotic cells. Here we analyzed the involvement of Hsp90 in the maintenance of cellular integrity using partial cell lysis as a measure. Inhibition of Hsp90 by geldanamycin, radicicol, cisplatin, and novobiocin induced a significant acceleration of detergent- and hypotonic shock-induced cell lysis. The concentration and time dependence of cell lysis acceleration was in agreement with the Hsp90 inhibition characteristics of the N-terminal inhibitors, geldanamycin and radicicol. Glutathione and other reducing agents partially blocked geldanamycin-induced acceleration of cell lysis but were largely ineffective with other inhibitors. Indeed, geldanamycin treatment led to superoxide production and a change in membrane fluidity. When Hsp90 content was diminished using anti-Hsp90 hammerhead ribozymes, an accelerated cell lysis was also observed. Hsp90 inhibition-induced cell lysis was more pronounced in eukaryotic (yeast, mouse red blood, and human T-lymphoma) cells than in bacteria. Our results indicate that besides the geldanamycin-induced superoxide production, and a consequent increase in cell lysis, inhibition or lack of Hsp90 alone can also compromise cellular integrity. Moreover, cell lysis after hypoxia and complement attack was also enhanced by any type of Hsp90 inhibition used, which shows that the maintenance of cellular integrity by Hsp90 is important in physiologically relevant lytic conditions of tumor cells.
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