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Metal complex strategies for photo-uncaging the small molecule bioregulators nitric oxide and carbon monoxide. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.07.018] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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2
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Ramos LCB, Marchesi MSP, Callejon D, Baruffi MD, Lunardi CN, Slep LD, Bendhack LM, da Silva RS. Enhanced Antitumor Activity against Melanoma Cancer Cells by Nitric Oxide Release and Photosensitized Generation of Singlet Oxygen from Ruthenium Complexes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600217] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Loyanne C. B. Ramos
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto - USP; Av. do Café s/n 14040-903 Ribeirão Preto-SP Brazil
| | | | - Daniel Callejon
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto - USP; Av. do Café s/n 14040-903 Ribeirão Preto-SP Brazil
| | - Marcelo Dias Baruffi
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto - USP; Av. do Café s/n 14040-903 Ribeirão Preto-SP Brazil
| | - Claure N. Lunardi
- Faculdade de Ceilandia; Universidade de Brasília; Brasilia-DF Brazil
| | - Leonardo D. Slep
- Departamento de Química Inorgánica; Analítica y Química Física and INQUIMAE; Facultad de Ciencias Exactas y Naturales; Universidad de Buenos Aires; Pabellón 2, Ciudad Universitaria C1428EHA Buenos Aires Argentina
| | - Lusiane M. Bendhack
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto - USP; Av. do Café s/n 14040-903 Ribeirão Preto-SP Brazil
| | - Roberto Santana da Silva
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto - USP; Av. do Café s/n 14040-903 Ribeirão Preto-SP Brazil
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3
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Pauwels B, Boydens C, Vanden Daele L, Van de Voorde J. Ruthenium-based nitric oxide-donating and carbon monoxide-donating molecules. J Pharm Pharmacol 2016; 68:293-304. [DOI: 10.1111/jphp.12511] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 11/29/2015] [Indexed: 01/10/2023]
Abstract
Abstract
Objectives
Over the past few years, the use of metallocomplexes for medical purposes has considerably grown. Because of its favourable characteristics, ruthenium has taken a significant place in this expanding field of research. Several ruthenium-containing metal compounds have been developed as delivery agents of physiological important molecules such as nitric oxide (NO) and carbon monoxide (CO).
Key findings
This review focuses on the (vaso)relaxant capacity of ruthenium-based NO-donating and CO-donating molecules in view of their potential usefulness in the treatment of cardiovascular diseases and erectile dysfunction.
Summary
Ruthenium seems to be a valuable candidate for the design of NO-donating and CO-donating molecules. To date, ruthenium remains of interest in drug research as the search for new alternatives is still necessary.
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Affiliation(s)
- Bart Pauwels
- Department of Pharmacology, Ghent University, Ghent, Belgium
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4
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Santana APM, Tavares BM, Lucetti LT, Gouveia FS, Ribeiro RA, Soares PMG, Sousa EHS, Lopes LGF, Medeiros JVR, Souza MHLP. The nitric oxide donor cis-[Ru(bpy)2(SO3)NO](PF6) increases gastric mucosa protection in mice--involvement of the soluble guanylate cyclase/K(ATP) pathway. Nitric Oxide 2015; 45:35-42. [PMID: 25681154 DOI: 10.1016/j.niox.2015.02.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Revised: 01/28/2015] [Accepted: 02/01/2015] [Indexed: 10/24/2022]
Abstract
Here, we have evaluated the protective effect of the NO donor cis-[Ru(bpy)2(SO3)NO](PF6) (FOR0810) in experimental models of gastric damage induced by naproxen or ethanol in mice, and the involvement of soluble guanylate cyclase (sGC) and ATP-sensitive K(+) channels (KATP) in these events. Swiss mice were pre-treated with saline, ODQ (a soluble guanylate cyclase inhibitor; 10 mg kg(-1)) or glibenclamide (a KATP channels blocker; 10 mg kg(-1)). After either 30 min or 1 h, FOR0810 (3 mg kg(-1)) was administered. At the end of 30 min, the animals received naproxen (300 mg kg(-1)) by gavage. After 6 h, the animals were sacrificed and gastric damage, myeloperoxidase (MPO) activity, and TNF-α and IL-1β gastric concentrations were evaluated. In addition, the effects of FOR0810 on naproxen-induced mesenteric leukocyte adherence were determined by intravital microscopy. Other groups, were pre-treated with saline, ODQ or glibenclamide. After either 30 min or 1 h, FOR0810 was administered. At the end of 30 min, the animals received 50% ethanol by gavage. After 1 h, the animals were sacrificed, and gastric damage, gastric reduced glutathione (GSH) concentration and malondialdehyde (MDA) levels were determined. In naproxen-induced gastric damage, FOR0810 prevented gastric injury, decreased gastric MPO activity and leukocyte adherence, associated with a decrease in TNFα and IL-1β gastric concentrations. FOR0810 also prevented ethanol-induced gastric damage by increase in GSH levels and decrease in MDA levels. ODQ and glibenclamide completely reversed FOR0810's ability to prevent gastric damage by either naproxen or ethanol. We infer that FOR0810 prevented gastric damage through the activation of both sGC and KATP channels, which triggered a decrease in both free radical and cytokine production via the blocking of neutrophil adhesion and infiltration.
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Affiliation(s)
- Ana Paula M Santana
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Bruno M Tavares
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Larisse T Lucetti
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Florêncio S Gouveia
- Department of Organic and Inorganic Chemistry, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Ronaldo A Ribeiro
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Pedro M G Soares
- Department of Morphology, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Eduardo H S Sousa
- Department of Organic and Inorganic Chemistry, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Luiz G F Lopes
- Department of Organic and Inorganic Chemistry, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Jand-Venes R Medeiros
- Department of Biotechnology and Biodiversity Center Research, Federal University of Piauí, Parnaíba, PI, Brazil
| | - Marcellus H L P Souza
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, CE, Brazil.
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5
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Carrone G, Gantov F, Slep LD, Etchenique R. Fluorescent Ligands and Energy Transfer in Photoactive Ruthenium–Bipyridine Complexes. J Phys Chem A 2014; 118:10416-24. [DOI: 10.1021/jp504030f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Guillermo Carrone
- Departamento de Química
Inorgánica, Analítica y Química Física,
INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón 2, AR1428EHA Buenos Aires, Argentina
| | - Federico Gantov
- Departamento de Química
Inorgánica, Analítica y Química Física,
INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón 2, AR1428EHA Buenos Aires, Argentina
| | - Leonardo D. Slep
- Departamento de Química
Inorgánica, Analítica y Química Física,
INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón 2, AR1428EHA Buenos Aires, Argentina
| | - Roberto Etchenique
- Departamento de Química
Inorgánica, Analítica y Química Física,
INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón 2, AR1428EHA Buenos Aires, Argentina
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6
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Ruthenium complexes as NO donors for vascular relaxation induction. Molecules 2014; 19:9628-54. [PMID: 25004072 PMCID: PMC6271244 DOI: 10.3390/molecules19079628] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 06/09/2014] [Accepted: 06/26/2014] [Indexed: 11/17/2022] Open
Abstract
Nitric oxide (NO) donors are substances that can release NO. Vascular relaxation induction is among the several functions of NO, and the administration of NO donors is a pharmacological alternative to treat hypertension. This review will focus on the physicochemical description of ruthenium-derived NO donor complexes that release NO via reduction and light stimulation. In particular, we will discuss the complexes synthesized by our research group over the last ten years, and we will focus on the vasodilation and arterial pressure control elicited by these complexes. Soluble guanylyl cyclase (sGC) and potassium channels are the main targets of the NO species released from the inorganic compounds. We will consider the importance of the chemical structure of the ruthenium complexes and their vascular effects.
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7
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Enhancing vascular relaxing effects of nitric oxide-donor ruthenium complexes. Future Med Chem 2014; 6:825-38. [DOI: 10.4155/fmc.14.26] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Ruthenium-derived complexes have emerged as new nitric oxide (NO) donors that may help circumvent the NO deficiency that impairs vasodilation. NO in vessels can be produced by the endothelial cells and/or released by NO donors. NO interacts with soluble guanylyl-cyclase to produce cGMP to activate the kinase-G pathway. As a result, conductance arteries, veins and resistance arteries dilate, whereas the cytosolic Ca2+ levels in the smooth muscle cells decrease. NO also reacts with oxygen or the superoxide anion, to generate reactive oxygen species that modulate NO-induced vasodilation. In this article, we focus on NO production by NO synthase and discuss the vascular changes taking place during hypertension originating from endothelial dysfunction. We will describe how the NO released from ruthenium-derived complexes enhances the vascular effects arising from failed NO generation or lack of NO bioavailability. In addition, how ruthenium-derived NO donors induce the hypotensive effect by vasodilation is also discussed.
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8
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Andriani KF, Caramori GF, Doro FG, Parreira RLT. Ru–NO and Ru–NO2bonding linkage isomerism in cis-[Ru(NO)(NO)(bpy)2]2+/+complexes – a theoretical insight. Dalton Trans 2014; 43:8792-804. [DOI: 10.1039/c4dt00016a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Calculated energy profile (kcal mol−1) for linkage isomers relative to the ground state structure (GS)1aprior the monoelectronic reduction.
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Affiliation(s)
- Karla Furtado Andriani
- Departamento de Química
- Universidade Federal de Santa Catarina
- Campi Universitário Trindade
- 88040-900 Florianópolis, Brazil
| | - Giovanni Finoto Caramori
- Departamento de Química
- Universidade Federal de Santa Catarina
- Campi Universitário Trindade
- 88040-900 Florianópolis, Brazil
| | - Fábio Gorzoni Doro
- Departamento de Química Geral e Inorgânica
- Universidade Federal da Bahia – UFBA
- Salvador, Brazil
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9
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Pereira AC, Olivon VC, Pernomian L, de Oliveira AM. Impairment of α1-adrenoceptor-mediated calcium influx in contralateral carotids following balloon injury: Beneficial effect of superoxide anions. Eur J Pharmacol 2014; 723:397-404. [DOI: 10.1016/j.ejphar.2013.10.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 10/20/2013] [Accepted: 10/27/2013] [Indexed: 12/29/2022]
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10
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Aguilar CM, Rocha WR. The nature of the M–NO bond in [M(Imidazole)(PPIX)(L)]q complexes (M=Fe2+, Ru2+; L=NO+, NO and NO−; PPIX=Protoporphyrin IX). Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2013.08.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Ford PC. Photochemical delivery of nitric oxide. Nitric Oxide 2013; 34:56-64. [DOI: 10.1016/j.niox.2013.02.001] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 01/14/2013] [Accepted: 02/01/2013] [Indexed: 10/27/2022]
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12
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Paulo M, Rodrigues GJ, da Silva RS, Bendhack LM. A new NO donor failed to release NO and to induce relaxation in the rat basilar artery. Eur J Pharm Sci 2012; 45:344-50. [DOI: 10.1016/j.ejps.2011.12.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 11/01/2011] [Accepted: 12/01/2011] [Indexed: 11/28/2022]
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13
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Pereira A, Paulo M, Araújo A, Rodrigues G, Bendhack L. Nitric oxide synthesis and biological functions of nitric oxide released from ruthenium compounds. Braz J Med Biol Res 2011; 44:947-57. [DOI: 10.1590/s0100-879x2011007500084] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 06/01/2011] [Indexed: 11/22/2022] Open
Affiliation(s)
| | - M. Paulo
- Universidade de São Paulo, Brasil
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A new nitrosyl ruthenium complex nitric oxide donor presents higher efficacy than sodium nitroprusside on relaxation of airway smooth muscle. Eur J Pharm Sci 2011; 43:370-7. [PMID: 21605670 DOI: 10.1016/j.ejps.2011.05.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 05/02/2011] [Accepted: 05/08/2011] [Indexed: 11/21/2022]
Abstract
Nitric oxide (NO) has been demonstrated to be the primary agent in relaxing airways in humans and animals. We investigated the mechanisms involved in the relaxation induced by NO-donors, ruthenium complex [Ru(terpy)(bdq)NO(+)](3+) (TERPY) and sodium nitroprusside (SNP) in isolated trachea of rats contracted with carbachol in an isolated organs chamber. For instance, we verified the contribution of K(+) channels, the importance of sGC/cGMP pathway, the influence of the extra and intracellular Ca(2+) sources and the contribution of the epithelium on the relaxing response. Additionally, we have used confocal microscopy in order to analyze the action of the NO-donors on cytosolic Ca(2+) concentration. The results demonstrated that both compounds led to the relaxation of trachea in a dependent-concentration way. However, the maximum effect (E(max)) of TERPY is higher than the SNP. The relaxation induced by SNP (but not TERPY) was significantly reduced by pretreatment with ODQ (sGC inhibitor). Only TERPY-induced relaxation was reduced by tetraethylammonium (K(+) channels blocker) and by pre-contraction with 75mM KCl (membrane depolarization). The response to both NO-donors was not altered by the presence of thapsigargin (sarcoplasmic reticulum Ca(2+)-ATPase inhibitor). The epithelium removal has reduced the relaxation only to SNP, and it has no effect on TERPY. The both NO-donors reduced the contraction evoked by Ca(2+) influx, while TERPY have shown a higher inhibitory effect on contraction. Moreover, the TERPY was more effective than SNP in reducing the cytosolic Ca(2+) concentration measured by confocal microscopy. In conclusion, these results show that TERPY induces airway smooth muscle relaxation by cGMP-independent mechanisms, it involves the fluxes of Ca(2+) and K(+) across the membrane, it is more effective in reducing cytosolic Ca(2+) concentration and inducing relaxation in the rat trachea than the standard drug, SNP.
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15
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Palladium nitrosyl carboxylate clusters: Synthesis and reactivity. X-ray structures of Pd4(μ-CO)2(μ-NO)(μ-RCO2)5 (R=iPr, iBu). J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2010.10.056] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Pereira ADC, Ford PC, da Silva RS, Bendhack LM. Ruthenium-nitrite complex as pro-drug releases NO in a tissue and enzyme-dependent way. Nitric Oxide 2011; 24:192-8. [DOI: 10.1016/j.niox.2011.03.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 02/21/2011] [Accepted: 03/01/2011] [Indexed: 11/28/2022]
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17
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da Silva FO, Gomes EC, Francisco TDS, Holanda AK, Diógenes IC, de Sousa EH, Lopes LG, Longhinotti E. NO donors cis-[Ru(bpy)2(L)NO]3+ and [Fe(CN)4(L)NO]− complexes immobilized on modified mesoporous silica spheres. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.09.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Pereira AC, Olivon VC, de Oliveira AM. Impaired calcium influx despite hyper-reactivity in contralateral carotid following balloon injury: eNOS involvement. Eur J Pharmacol 2010; 642:121-7. [DOI: 10.1016/j.ejphar.2010.05.051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2009] [Revised: 03/25/2010] [Accepted: 05/06/2010] [Indexed: 11/24/2022]
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19
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An Apparent Paradox: Attenuation of Phenylephrine-mediated Calcium Mobilization and Hyperreactivity to Phenylephrine in Contralateral Carotid After Balloon Injury. J Cardiovasc Pharmacol 2010; 56:162-70. [DOI: 10.1097/fjc.0b013e3181e571cd] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Lunardi CN, da Silva RS, Bendhack LM. New nitric oxide donors based on ruthenium complexes. Braz J Med Biol Res 2009; 42:87-93. [PMID: 19219301 DOI: 10.1590/s0100-879x2009000100013] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2008] [Accepted: 01/12/2008] [Indexed: 11/21/2022] Open
Abstract
Nitric oxide (NO) donors produce NO-related activity when applied to biological systems. Among its diverse functions, NO has been implicated in vascular smooth muscle relaxation. Despite the great importance of NO in biological systems, its pharmacological and physiological studies have been limited due to its high reactivity and short half-life. In this review we will focus on our recent investigations of nitrosyl ruthenium complexes as NO-delivery agents and their effects on vascular smooth muscle cell relaxation. The high affinity of ruthenium for NO is a marked feature of its chemistry. The main signaling pathway responsible for the vascular relaxation induced by NO involves the activation of soluble guanylyl-cyclase, with subsequent accumulation of cGMP and activation of cGMP-dependent protein kinase. This in turn can activate several proteins such as K+ channels as well as induce vasodilatation by a decrease in cytosolic Ca2+. Oxidative stress and associated oxidative damage are mediators of vascular damage in several cardiovascular diseases, including hypertension. The increased production of the superoxide anion (O2-) by the vascular wall has been observed in different animal models of hypertension. Vascular relaxation to the endogenous NO-related response or to NO released from NO deliverers is impaired in vessels from renal hypertensive (2K-1C) rats. A growing amount of evidence supports the possibility that increased NO inactivation by excess O2- may account for the decreased NO bioavailability and vascular dysfunction in hypertension.
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Affiliation(s)
- C N Lunardi
- Laboratório de Farmacologia, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
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Bonaventura D, Lunardi CN, Rodrigues GJ, Neto MA, Vercesi JA, de Lima RG, da Silva RS, Bendhack LM. Endothelium negatively modulates the vascular relaxation induced by nitric oxide donor, due to uncoupling NO synthase. J Inorg Biochem 2009; 103:1366-74. [DOI: 10.1016/j.jinorgbio.2009.07.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 07/22/2009] [Accepted: 07/24/2009] [Indexed: 10/20/2022]
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Hipólito UV, Rodrigues GJ, Lunardi CN, Bonaventura D, Ambrosio SR, de Oliveira AM, Bendhack LM, da Costa FB, Tirapelli CR. Mechanisms underlying the vasorelaxant action of the pimarane ent-8(14),15-pimaradien-3beta-ol in the isolated rat aorta. Eur J Pharmacol 2009; 616:183-91. [PMID: 19540222 DOI: 10.1016/j.ejphar.2009.06.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2009] [Revised: 05/25/2009] [Accepted: 06/08/2009] [Indexed: 11/28/2022]
Abstract
Pimarane-type diterpenes were described to exert antispasmodic and relaxant activities. Based on this observation we hypothesized that the diterpene ent-8(14),15-pimaradien-3beta-ol (PA-3beta-ol) induced vascular relaxation. With this purpose, the present work investigates the mechanisms involved in the vasorelaxant effect of the pimarane-type diterpene PA-3beta-ol. Vascular reactivity experiments, using standard muscle bath procedures, were performed in isolated aortic rings from male Wistar rats. Cytosolic calcium concentration ([Ca(2+)]c) was measured by confocal microscopy using the fluorescent probe Fluo-3AM. PA-3beta-ol (10, 50 and 100 micromol/l) inhibited phenylephrine and KCl-induced contraction in either endothelium-intact or denuded rat aortic rings. PA-3beta-ol also reduced CaCl(2)-induced contraction in Ca(2+)-free solution containing KCl (30 mmol/l) or phenylephrine (0.1 micromol/l). PA-3beta-ol (1-300 micromol/l) concentration dependently relaxed phenylephrine-pre-contracted rings with intact or denuded endothelium. The diterpene also relaxed KCl-pre-contracted rings with intact or denuded endothelium. Moreover, Ca(2+) mobilization study showed that PA-3beta-ol (100 micromol/l) and verapamil (1 micromol/l) inhibited the increase in Ca(2+)-concentration in smooth muscle and endothelial cells induced by phenylephrine (10 micromol/l) or KCl (60 mmol/l). Pre-incubation of intact or denuded aortic rings with N(G)-nitro-l-arginine methyl ester (L-NAME, 100 micromol/l) and 1H-[1,2,4]Oxadiazolo[4,3-a]quinoxalin-1-one (ODQ, 1 micromol/l) produced a rightward displacement of the PA-3beta-ol concentration-response curves. On the other hand, 7-nitroindazole (100 micromol/l), 1400 W (1 micromol/l), indomethacin (10 micromol/l) and tetraethylammonium (1 mmol/l) did not affect PA-3beta-ol-induced relaxation. Collectively, our results provide evidence that the effects elicited by PA-3beta-ol involve extracellular Ca(2+) influx blockade. Its effects are also partly mediated by the activation of NO-cGMP pathway.
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Affiliation(s)
- Ulisses V Hipólito
- Department of Psychiatric Nursing and Human Sciences, College of Nursing of Ribeirão Preto, University de São Paulo (USP), Ribeirão Preto, SP, Brazil.
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da Rocha ZN, Marchesi MSP, Molin JC, Lunardi CN, Miranda KM, Bendhack LM, Ford PC, da Silva RS. The inducing NO-vasodilation by chemical reduction of coordinated nitrite ion in cis-[Ru(NO(2))L(bpy)(2)](+) complex. Dalton Trans 2008:4282-7. [PMID: 18682867 DOI: 10.1039/b803441a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of [Ru(NO(2))L(bpy)(2)](+) (bpy = 2,2'-bipyridine and L = pyridine (py) and pyrazine (pz)) can be accomplished by addition of [Ru(NO)L(bpy)(2)](PF(6))(3) to aqueous solutions of physiological pH. The electrochemical processes of [Ru(NO(2))L(bpy)(2)](+) in aqueous solution were studied by cyclic voltammetry and differential pulse voltammetry. The anodic scan shows a peak around 1.00 V vs. Ag/AgCl attributed to the oxidation process centered on the metal ion. However, in the cathodic scan a second peak around -0.60 V vs. Ag/AgCl was observed and attributed to the reduction process centered on the nitrite ligand. The controlled reduction potential electrolysis at -0.80 V vs. Ag/AgCl shows NO release characteristics as judged by NO measurement with a NO-sensor. This assumption was confirmed by ESI/MS(+) and spectroelectrochemical experiment where cis-[Ru(bpy)(2)L(H(2)O)](2+) was obtained as a product of the reduction of cis-[Ru(II)(NO(2))L(bpy)(2)](+). The vasorelaxation observed in denuded aortic rings pre-contracted with 0.1 mumol L(-1) phenylephrine responded with relaxation in the presence of cis-[Ru(II)(NO(2))L(bpy)(2)](+). The potential of rat aorta cells to metabolize cis-[Ru(II)(NO(2))L(bpy)(2)](+) was also followed by confocal analysis. The obtained results suggest that NO release happens by reduction of cis-[Ru(II)(NO(2))L(bpy)(2)](+) inside the cell. The maximum vasorelaxation was achieved with 1 x 10(-5) mol L(-1) of cis-[Ru(II)(NO(2))L(bpy)(2)](+) complex.
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Affiliation(s)
- Zênis Novais da Rocha
- Instituto de Química da Universidade Federal da Bahia - Campus Ondina, Salvador, Bahia, Brazil
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Photolysis of [Ru(bipy)2(NO)Cl](PF6)2 in frozen ionic glass matrices. Evidence for nitrosyl linkage isomerism and NO-loss in a physiologically relevant nitric oxide source. INORG CHEM COMMUN 2008. [DOI: 10.1016/j.inoche.2008.03.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Holanda AK, da Silva FO, Sousa JR, Diógenes IC, Carvalho IM, Moreira ÍS, Clarke MJ, Lopes LG. Photochemical NO release from nitrosyl RuII complexes with C-bound imidazoles. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.02.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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26
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Vitamin C improves the effect of a new nitric oxide donor on the vascular smooth muscle from renal hypertensive rats. Nitric Oxide 2008; 18:176-83. [DOI: 10.1016/j.niox.2007.12.002] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 11/29/2007] [Accepted: 12/12/2007] [Indexed: 11/19/2022]
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Gomes AJ, Barbougli PA, Espreafico EM, Tfouni E. trans-[Ru(NO)(NH3)4(py)](BF4)3·H2O encapsulated in PLGA microparticles for delivery of nitric oxide to B16-F10 cells: Cytotoxicity and phototoxicity. J Inorg Biochem 2008; 102:757-66. [DOI: 10.1016/j.jinorgbio.2007.11.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Revised: 11/25/2007] [Accepted: 11/27/2007] [Indexed: 10/22/2022]
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Bonaventura D, Lunardi CN, Rodrigues GJ, Neto MA, Bendhack LM. A novel mechanism of vascular relaxation induced by sodium nitroprusside in the isolated rat aorta. Nitric Oxide 2008; 18:287-95. [PMID: 18307997 DOI: 10.1016/j.niox.2008.02.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2007] [Revised: 02/05/2008] [Accepted: 02/08/2008] [Indexed: 11/26/2022]
Abstract
Sodium nitroprusside (SNP) is an endothelium-independent relaxant agent and its effect is attributed to its direct action on the vascular smooth muscle (VSM). Endothelium modulates the vascular tone through the release of vasoactive agents, such as NO. The aim of this study was to investigate the contribution of the endothelium on SNP vasorelaxation, NO release and Ca2+ mobilization. Vascular reactivity experiments showed that endothelium potentiates the SNP-relaxation in rat aortic rings and this effect was abolished by l-NAME. SNP-relaxation in intact endothelium aorta was inhibited by NOS inhibitors for the constitutive isoforms (cNOS). Furthermore, endogenous NO is involved on the SNP-effect and this endogenous NO is released by cNOS. Moreover, Ca2+ mobilization study shows that l-NAME inhibited the reduction of Ca2+-concentration in VSM cells and reduced the increase in Ca2+-concentration in endothelial cells induced by SNP. This enhancement in Ca2+-concentration in the endothelial cells is due to a voltage-dependent Ca2+ channels activation. The present findings indicate that the relaxation and [Ca2+]i decrease induced by SNP in VSM cells is potentiated by endothelial production of NO by cNOS-activation in rat aorta.
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Affiliation(s)
- Daniella Bonaventura
- Departamento de Física e Química, Laboratório de Farmacologia, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, USP, 14.040-903 Ribeirão Preto, SP, Brazil.
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29
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Guo L, Su J, Deng BW, Yu ZY, Kang LP, Zhao ZH, Shan YJ, Chen JP, Ma BP, Cong YW. Active pharmaceutical ingredients and mechanisms underlying phasic myometrial contractions stimulated with the saponin extract from Paris polyphylla Sm. var. yunnanensis used for abnormal uterine bleeding. Hum Reprod 2008; 23:964-71. [PMID: 18258765 DOI: 10.1093/humrep/den001] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Total steroidal saponins of Paris polyphylla Sm. var. yunnanensis (TSSP) have been widely used in China for the treatment of abnormal uterine bleeding (AUB). But until now, the main active constituents and the mechanisms underlying the pharmacological actions on uterine activity have not been described. METHODS Total steroidal saponins were extracted with EtOH and purified by chromatography. In vitro isometric contraction studies were performed using myometrial strips from estrogen-primed or pregnant rats. Intracellular calcium was monitored under a confocal microscope using Fluo-3 AM-loaded myometrial cells. RESULTS TSSP dose-dependently induced phasic myometrial contractions in vitro. Experiments with calcium channel blockers or kinase inhibitors demonstrated that the TSSP-stimulated myometrial contraction was mediated by an increase in [Ca(2+)](i) via influx of extracellular calcium and release of intracellular calcium. Through bioassay-guided separation, it was found that total spirostanol saponins exhibited contractile activity in myometrium and Pennogenin-3-O-alpha-L-arabinofuranosyl(1-->4)[alpha-L-rhamnopyranosyl(1-->2)]-beta-D-glucopyranoside (PARG) was identified as the active ingredient of TSSP. Furthermore, the contractile response of rat myometrium to PARG was significantly enhanced with advancing pregnancy. CONCLUSIONS These data provide evidence that myometrial contractility stimulated by TSSP results from [Ca(2+)](i) increase and supports the possibility that some spirostanol gylcosides may represent a new type of contractile agonist for the uterus.
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Affiliation(s)
- L Guo
- Department of Pathophysiology, Beijing Institute of Radiation Medicine, No. 27 Taiping Road, Beijing 100850, China
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Lunardi CN, Vercesi JA, da Silva RS, Bendhack LM. Vasorelaxation induced by the new nitric oxide donor cis-[Ru(Cl)(bpy)(2)(NO)](PF(6)) is due to activation of K(Ca) by a cGMP-dependent pathway. Vascul Pharmacol 2007; 47:139-44. [PMID: 17602893 DOI: 10.1016/j.vph.2007.05.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2007] [Revised: 05/16/2007] [Accepted: 05/23/2007] [Indexed: 11/21/2022]
Abstract
We investigated the effects of selective K(+) channel blockers and guanylyl cyclase inhibitor on the rat aorta relaxation induced by the new NO donor cis-[Ru(Cl)(bpy)(2)(NO)](PF(6)) (RUNOCL), following endothelium removal. NO release from RUNOCL was obtained by photo-induction using a visible light system lambda > 380 nm. RUNOCL induced relaxation of phenylephrine contracted aortic rings under light with the maximum effect (ME) of 101.2+/-3.7% and pD(2): 6.62+/-0.16 (n=7), but not in the absence of light. Relaxation stimulated with RUNOCL was also studied on 60 mM of KCl-contracted arteries or after incubation with the non-selective K(+) channel blocker (1 mM TEA) or the selective K(+) channel blockers (3 microM glibenclamide (K(ATP)), 1 mM 4-aminopyridine (K(V), 4-AP), 1 microM apamin (SK(Ca)-APA) or 0.1 microM iberiotoxin (BK(Ca) IBTX). Relaxation induced by RUNOCL was lower in KCl-contracted aortic rings with ME of 68.6+/-10.0% and pD(2): 3.92+/-0.60 (n=4). As compared to Phe-contracted arteries the potency of RUNOCL in inducing rat aorta relaxation was reduced by K(+) channel blockers as demonstrated by the pD(2) values from 6.62+/-0.16 (n=7) (control) to (TEA: 5.32+/-0.108, n=5; IBTX: 5.63+/-0.02 (n=5), APA: 5.73+/-0.13 (n=5)). But the ME was reduced only by IBTX (60.7+/-3.4%). 4-AP and glibenclamide had no effect on the relaxation induced by RUNOCL. The aortic tissue cGMP content increased with RUNOCL under light irradiation from 63.13+/-0.45 fmol/microg to 70.56+/-4.64 fmol/microg of protein (n=4) and the inhibition of guanylyl cyclase with ODQ reduced the ME: 30.1+/-1.6% and pD(2): 6.35+/-0.05 (n=4). Our results suggest that the NO released by photo-induction from RUNOCL induces rat aorta relaxation by activation of K(Ca) by a cGMP-dependent pathway.
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Affiliation(s)
- Claure N Lunardi
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto-USP. 14.040-903 Ribeirão Preto, SP-Brazil
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