1
|
Carullo G, Borghini F, Fusi F, Saponara S, Fontana A, Pozzetti L, Fedeli R, Panti A, Gorelli B, Aquino G, Basilicata MG, Pepe G, Campiglia P, Biagiotti S, Gemma S, Butini S, Pianezze S, Loppi S, Cavaglioni A, Perini M, Campiani G. Traceability and authentication in agri-food production: A multivariate approach to the characterization ofthe Italian food excellence elephant garlic (Allium ampeloprasum L.), a vasoactive nutraceutical. Food Chem 2024; 444:138684. [PMID: 38359701 DOI: 10.1016/j.foodchem.2024.138684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 02/01/2024] [Accepted: 02/04/2024] [Indexed: 02/17/2024]
Abstract
A research platform for food authentication was set up by combining stable isotope ratio analysis, metabolomics by gas and liquid mass-spectrometry and NMR investigations, chemometric analyses for food excellences. This multi-analytical approach was tested on samples of elephant garlic (Allium ampeloprasum L.), a species belonging to the same genus of common garlic (Allium ampeloprasum L.), mainly produced in southern Tuscany-(Allium ampeloprasum). The isotopic composition allowed the product to be geographically characterized. Flavonoids, like (+)-catechin, cinnamic acids, quercetin glycosides were identified. The samples showed also a significant amount of dipeptides, sulphur-containing metabolites and glutathione, the latter of which could be considered a molecular marker of the analyzed elephant garlic. For nutraceutical profiling to reach quality labels, extracts were investigated in specific biological assays, displaying interesting vasorelaxant properties in rat aorta by mediating nitric oxide release from the endothelium and exhibited positive inotropic and negative chronotropic effects in rat perfused heart.
Collapse
Affiliation(s)
- Gabriele Carullo
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy; BioAgryLab, University of Siena, 53100 Siena, Italy.
| | - Francesca Borghini
- ISVEA Srl, Istituto per lo Sviluppo Viticolo Enologico e Agroindustriale, 53036 Poggibonsi(SI), Italy.
| | - Fabio Fusi
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy.
| | - Simona Saponara
- Department of Life Sciences, University of Siena, 53100 Siena, Italy.
| | - Anna Fontana
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy.
| | - Luca Pozzetti
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy.
| | - Riccardo Fedeli
- BioAgryLab, University of Siena, 53100 Siena, Italy; Department of Life Sciences, University of Siena, 53100 Siena, Italy.
| | - Alice Panti
- Department of Life Sciences, University of Siena, 53100 Siena, Italy.
| | - Beatrice Gorelli
- Department of Life Sciences, University of Siena, 53100 Siena, Italy.
| | - Giovanna Aquino
- Department of Pharmacy, University of Salerno, 84084 Fisciano, SA, Italy; PhD Program in Drug Discovery and Development, University of Salerno, Fisciano, SA, Italy.
| | | | - Giacomo Pepe
- Department of Pharmacy, University of Salerno, 84084 Fisciano, SA, Italy; NBFC, National Biodiversity Future Center, Palermo 90133, Italy.
| | - Pietro Campiglia
- Department of Pharmacy, University of Salerno, 84084 Fisciano, SA, Italy.
| | - Stefano Biagiotti
- Telematic University Pegaso, Piazza Trieste e Trento, 48 -80132 Napoli, Italy.
| | - Sandra Gemma
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy; BioAgryLab, University of Siena, 53100 Siena, Italy.
| | - Stefania Butini
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy; BioAgryLab, University of Siena, 53100 Siena, Italy.
| | - Silvia Pianezze
- Experimental and Technological Services Department, Fondazione Edmund Mach, 38098 San Michele all'Adige (TN), Italy.
| | - Stefano Loppi
- BioAgryLab, University of Siena, 53100 Siena, Italy; Department of Life Sciences, University of Siena, 53100 Siena, Italy.
| | - Alessandro Cavaglioni
- ISVEA Srl, Istituto per lo Sviluppo Viticolo Enologico e Agroindustriale, 53036 Poggibonsi(SI), Italy.
| | - Matteo Perini
- Experimental and Technological Services Department, Fondazione Edmund Mach, 38098 San Michele all'Adige (TN), Italy.
| | - Giuseppe Campiani
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy; BioAgryLab, University of Siena, 53100 Siena, Italy; Bioinformatics Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan 81746-7346, Iran.
| |
Collapse
|
2
|
Son NT, Gianibbi B, Panti A, Spiga O, Bastos JK, Fusi F. Vasorelaxant Activity of (2S)-Sakuranetin and Other Flavonoids Isolated from the Green Propolis of the Caatinga Mimosa tenuiflora. PLANTA MEDICA 2024; 90:454-468. [PMID: 38599606 DOI: 10.1055/a-2294-7042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Some in vitro and in vivo evidence is consistent with the cardiovascular beneficial activity of propolis. As the single actors responsible for this effect have never been identified, an in-depth investigation of flavonoids isolated from the green propolis of the Caatinga Mimosa tenuiflora was performed and their mechanism of action was described. A comprehensive electrophysiology, functional, and molecular docking approach was applied. Most flavanones and flavones were effective CaV1.2 channel blockers with a potency order of (2S)-sakuranetin > eriodictyol-7,3'-methyl ether > quercetin 3-methyl ether > 5,4'-dihydroxy-6,7-dimethoxyflavanone > santin > axillarin > penduletin > kumatakenin, ermanin and viscosine being weak or modest stimulators. Except for eriodictyol 5-O-methyl ether, all the flavonoids were also effective spasmolytic agents of vascular rings, kumatakenin and viscosine also showing an endothelium-dependent activity. (2S)-Sakuranetin also stimulated KCa1.1 channels both in single myocytes and vascular rings. In silico analysis provided interesting insights into the mode of action of (2S)-sakuranetin within both CaV1.2 and KCa1.1 channels. The green propolis of the Caatinga Mimosa tenuiflora is a valuable source of multi-target vasoactive flavonoids: this evidence reinforces its nutraceutical value in the cardiovascular disease prevention arena.
Collapse
Affiliation(s)
- Ninh The Son
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
- Department of Chemistry, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Caugiay, Hanoi, Vietnam
| | - Beatrice Gianibbi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Siena, Italy
| | - Alice Panti
- Dipartimento di Scienze della Vita, Università di Siena, Siena, Italy
| | - Ottavia Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Siena, Italy
| | - Jairo Kenupp Bastos
- School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, University of São Paulo, Ribeirão Preto-SP, Brazil
| | - Fabio Fusi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Siena, Italy
| |
Collapse
|
3
|
Son NT, Gianibbi B, Panti A, Spiga O, Bastos JK, Fusi F. 3,3'-O-dimethylquercetin: A bi-functional vasodilator isolated from green propolis of the Caatinga Mimosa tenuiflora. Eur J Pharmacol 2024; 967:176400. [PMID: 38331336 DOI: 10.1016/j.ejphar.2024.176400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 01/29/2024] [Accepted: 02/06/2024] [Indexed: 02/10/2024]
Abstract
In the search for novel, bi-functional compounds acting as CaV1.2 channel blockers and K+ channel stimulators, which represent an effective therapy for hypertension, 3,3'-O-dimethylquercetin was isolated for the first time from Brazilian Caatinga green propolis. Its effects were investigated through electrophysiological, functional, and computational approaches. In rat tail artery myocytes, 3,3'-O-dimethylquercetin blocked Ba2+ currents through CaV1.2 channels (IBa1.2) in a concentration-dependent manner, with the inhibition being reversed upon washout. The compound also shifted the voltage dependence of the steady-state inactivation curve to more negative potentials without affecting the slope of the inactivation and activation curves. Furthermore, the flavonoid stimulated KCa1.1 channel currents (IKCa1.1). In silico simulations provided additional evidence for the binding of 3,3'-O-dimethylquercetin to KCa1.1 and CaV1.2 channels and elucidated its mechanism of action. In depolarized rat tail artery rings, the flavonoid induced a concentration-dependent relaxation. Moreover, in rat aorta rings its antispasmodic effect was inversely related to the transmembrane K+ gradient. In conclusion, 3,3'-O-dimethylquercetin demonstrates effective in vitro vasodilatory properties, encouraging the exploration of its scaffold to develop novel derivatives for potential use in the treatment of hypertension.
Collapse
Affiliation(s)
- Ninh The Son
- School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, University of São Paulo, Avenida Professor Doutor Zeferino Vaz, S/N, 14040-903, Ribeirão Preto-SP, Brazil; Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi, 10000, Vietnam; Department of Chemistry, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, Hanoi, 10000, Vietnam
| | - Beatrice Gianibbi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100, Siena, Italy
| | - Alice Panti
- Dipartimento di Scienze della Vita, Università di Siena, Via A. Moro 2, 53100, Siena, Italy
| | - Ottavia Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100, Siena, Italy
| | - Jairo Kenupp Bastos
- School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, University of São Paulo, Avenida Professor Doutor Zeferino Vaz, S/N, 14040-903, Ribeirão Preto-SP, Brazil.
| | - Fabio Fusi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100, Siena, Italy.
| |
Collapse
|
4
|
Pettini F, Spiga O, Furini S, Fusi F. Electrophysiology, molecular modelling, and functional analysis of the effects of dietary quercetin and flavonoid analogues on K ir6.1 channels in rat stomach fundus smooth muscle. Biochem Pharmacol 2024; 220:115969. [PMID: 38086489 DOI: 10.1016/j.bcp.2023.115969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
Flavonoids, ubiquitously distributed in the plant world, are regularly ingested with diets rich in fruit, vegetables, wine, and tea. During digestion, they are partially absorbed in the stomach. The present work aimed to assess the in vitro effects of quercetin and ten structurally related flavonoids on the rat gastric fundus smooth muscle, focussing on ATP-dependent K+ (Kir6.1) channels, which play a central role in the regulation of resting membrane potential, membrane excitability and, consequently, of gastric motility. Whole-cell currents through Kir6.1 channels (IKir6.1) were recorded with the patch-clamp technique and the mechanical activity of gastric fundus smooth muscle strips was studied under isometric conditions. Galangin ≈ tamarixetin > quercetin > kaempferol > isorhamnetin ≈ luteolin ≈ fisetin > (±)-taxifolin inhibited pinacidil-evoked, glibenclamide-sensitive IKir6.1 in a concentration-dependent manner. Morin, rutin, and myricetin were ineffective. The steric hindrance of the molecule and the number and position of hydroxyl groups on the B ring played an important role in the activity of the molecule. Molecular docking simulations revealed a possible binding site for flavonoids in the C-terminal domain of the Kir6.1 channel subunit SUR2B, in a flexible loop formed by residues 251 to 254 of chains C and D. Galangin and tamarixetin, but not rutin relaxed both high K+- and carbachol-induced contraction of fundus strips in a concentration-dependent manner. Furthermore, both flavonoids shifted to the right the concentration-relaxation curves to either pinacidil or L-cysteine constructed in strips pre-contracted by high K+, rutin being ineffective. In conclusion, IKir6.1 inhibition exerted by dietary flavonoids might counterbalance their myorelaxant activity, affect gastric accommodation or, at least, some stages of digestion.
Collapse
Affiliation(s)
- Francesco Pettini
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy.
| | - Ottavia Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy.
| | - Simone Furini
- Department of Electrical, Electronic and Information Engineering ″Guglielmo Marconi", University of Bologna, via dell'Università 50, 47521, Cesena, (FC), Italy.
| | - Fabio Fusi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy.
| |
Collapse
|
5
|
Fedeli R, Marotta L, Frattaruolo L, Panti A, Carullo G, Fusi F, Saponara S, Gemma S, Butini S, Cappello AR, Vannini A, Campiani G, Loppi S. Nutritionally enriched tomatoes (Solanum lycopersicum L.) grown with wood distillate: chemical and biological characterization for quality assessment. J Food Sci 2023; 88:5324-5338. [PMID: 37961008 DOI: 10.1111/1750-3841.16829] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/26/2023] [Accepted: 10/20/2023] [Indexed: 11/15/2023]
Abstract
Bio-based products are nowadays useful tools able to affect the productivity and quality of conventionally cultivated crops. Several bio-based products are currently on the market; one of the newest and most promising is the wood distillate (WD) derived from the pyrolysis process of waste biomass after timber. Its foliar application has been widely investigated and shown to promote the antioxidant profile of cultivated crops. WD was used here as additive for the cultivation of tomato (Solanum lycopersicum L.) plants. The application improved quality (chemical) parameters, minerals, polyphenols, and lycopene contents of tomato fruits. The extracts of WD-treated and untreated tomatoes have been chemically and biologically characterized. The 1 H-NMR and ESI-mass spectrometry analyses of the extracts revealed the presence of different fatty acids, amino acids and sugars. In particular, the WD-treated tomatoes showed the presence of pyroglutamic acid and phloridzin derivatives, but also dihydrokaempferol, naringenin glucoside, cinnamic acid, and kaempferol-3-O-glucoside. When tested in cells, the extracts showed a promising anti-inflammatory profile in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophages. Furthermore, the extracts displayed a slight vasorelaxant activity on rat aorta rings (either endothelium-denuded or endothelium-intact) pre-contracted with phenylephrine or potassium chloride. PRACTICAL APPLICATION: Wood distillate has been used for tomato plant growth. Tomatoes showed improved nutritional parameters, and their extracts displayed antioxidant and anti-inflammatory activities.
Collapse
Affiliation(s)
- Riccardo Fedeli
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Ludovica Marotta
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Luca Frattaruolo
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende, Cosenza, Italy
| | - Alice Panti
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Gabriele Carullo
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Fabio Fusi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Simona Saponara
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Sandra Gemma
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Stefania Butini
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Anna Rita Cappello
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende, Cosenza, Italy
| | - Andrea Vannini
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Giuseppe Campiani
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Stefano Loppi
- Department of Life Sciences, University of Siena, Siena, Italy
- BAT Center-Interuniversity Center for Studies on Bioinspired Agro-Environmental Technology, University of Naples Federico II, Napoli, Italy
| |
Collapse
|
6
|
Ahmed A, Trezza A, Gentile M, Paccagnini E, Panti A, Lupetti P, Spiga O, Bova S, Fusi F. Dynamin-independent Ca V1.2 and K Ca1.1 channels regulation and vascular tone modulation by the mitochondrial fission inhibitors dynasore and dyngo-4a. Eur J Pharmacol 2023; 951:175786. [PMID: 37179045 DOI: 10.1016/j.ejphar.2023.175786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 05/03/2023] [Accepted: 05/10/2023] [Indexed: 05/15/2023]
Abstract
A role for mitochondrial fission in vascular contraction has been proposed based on the vasorelaxant activity of the dynamin (and mitochondrial fission) inhibitors mdivi-1 and dynasore. However, mdivi-1 is capable to inhibit Ba2+ currents through CaV1.2 channels (IBa1.2), stimulate KCa1.1 channel currents (IKCa1.1), and modulate pathways key to the maintenance of vessel active tone in a dynamin-independent manner. Using a multidisciplinary approach, the present study demonstrates that dynasore, like mdivi-1, is a bi-functional vasodilator, blocking IBa1.2 and stimulating IKCa1.1 in rat tail artery myocytes, as well as promoting relaxation of rat aorta rings pre-contracted by either high K+ or phenylephrine. Conversely, its analogue dyngo-4a, though inhibiting mitochondrial fission triggered by phenylephrine and stimulating IKCa1.1, did not affect IBa1.2 but potentiated both high K+- and phenylephrine-induced contractions. Docking and molecular dynamics simulations identified the molecular basis supporting the different activity of dynasore and dyngo-4a at CaV1.2 and KCa1.1 channels. Mito-tempol only partially counteracted the effects of dynasore and dyngo-4a on phenylephrine-induced tone. In conclusion, the present data, along with previous observations (Ahmed et al., 2022) rise caution for the use of dynasore, mdivi-1, and dyngo-4a as tools to investigate the role of mitochondrial fission in vascular contraction: to this end, a selective dynamin inhibitor and/or a different experimental approach are needed.
Collapse
Affiliation(s)
- Amer Ahmed
- Dipartimento di Scienze della Vita, Università di Siena, via A. Moro 2, 53100, Siena, Italy
| | - Alfonso Trezza
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, via A. Moro 2, 53100, Siena, Italy
| | - Mariangela Gentile
- Dipartimento di Scienze della Vita, Università di Siena, via A. Moro 2, 53100, Siena, Italy
| | - Eugenio Paccagnini
- Dipartimento di Scienze della Vita, Università di Siena, via A. Moro 2, 53100, Siena, Italy
| | - Alice Panti
- Dipartimento di Scienze della Vita, Università di Siena, via A. Moro 2, 53100, Siena, Italy
| | - Pietro Lupetti
- Dipartimento di Scienze della Vita, Università di Siena, via A. Moro 2, 53100, Siena, Italy
| | - Ottavia Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, via A. Moro 2, 53100, Siena, Italy
| | - Sergio Bova
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
| | - Fabio Fusi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, via A. Moro 2, 53100, Siena, Italy.
| |
Collapse
|
7
|
Carullo G, Falbo F, Ahmed A, Trezza A, Gianibbi B, Nicolotti O, Campiani G, Aiello F, Saponara S, Fusi F. Artificial intelligence-driven identification of morin analogues acting as Ca V1.2 channel blockers: Synthesis and biological evaluation. Bioorg Chem 2023; 131:106326. [PMID: 36563413 DOI: 10.1016/j.bioorg.2022.106326] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 12/02/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
Morin is a vasorelaxant flavonoid, whose activity is ascribable to CaV1.2 channel blockade that, however, is weak as compared to that of clinically used therapeutic agents. A conventional strategy to circumvent this drawback is to synthesize new derivatives differently decorated and, in this context, morin-derivatives able to interact with CaV1.2 channels were found by employing the potential of PLATO in target fishing and reverse screening. Three different derivatives (5a-c) were selected as promising tools, synthesized, and investigated in in vitro functional studies using rat aorta rings and rat tail artery myocytes. 5a-c were found more effective vasorelaxant agents than the naturally occurring parent compound and antagonized both electro- and pharmaco-mechanical coupling in an endothelium-independent manner. 5a, the series' most potent, reduced also Ca2+ mobilization from intracellular store sites. Furthermore, 5a≈5c > 5b inhibited Ba2+ current through CaV1.2 channels. However, compound 5a caused also a concentration-dependent inhibition of KCa1.1 channel currents.
Collapse
Affiliation(s)
- Gabriele Carullo
- Department of Life Sciences, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Federica Falbo
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Ed. Polifunzionale, 87036, Rende (CS), Italy
| | - Amer Ahmed
- Department of Life Sciences, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Alfonso Trezza
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Beatrice Gianibbi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Orazio Nicolotti
- Department of Pharmacy- Drug Sciences, University of Bari "Aldo Moro", Via Orabona 4, 70125 Bari, Italy
| | - Giuseppe Campiani
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Francesca Aiello
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Ed. Polifunzionale, 87036, Rende (CS), Italy.
| | - Simona Saponara
- Department of Life Sciences, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Fabio Fusi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| |
Collapse
|
8
|
Ahmed A, Trezza A, Gentile M, Paccagnini E, Lupetti P, Spiga O, Bova S, Fusi F. The drp-1-mediated mitochondrial fission inhibitor mdivi-1 impacts the function of ion channels and pathways underpinning vascular smooth muscle tone. Biochem Pharmacol 2022; 203:115205. [DOI: 10.1016/j.bcp.2022.115205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 07/07/2022] [Accepted: 08/02/2022] [Indexed: 11/24/2022]
|
9
|
Cuong NM, Son NT, Nhan NT, Fukuyama Y, Ahmed A, Saponara S, Trezza A, Gianibbi B, Vigni G, Spiga O, Fusi F. Vietnamese Dalbergia tonkinensis: A Promising Source of Mono- and Bifunctional Vasodilators. Molecules 2022; 27:molecules27144505. [PMID: 35889386 PMCID: PMC9324545 DOI: 10.3390/molecules27144505] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/11/2022] [Accepted: 07/12/2022] [Indexed: 02/04/2023] Open
Abstract
Hypertension is a risk factor for cardiovascular diseases, which are the main cause of morbidity and mortality in the world. In the search for new molecules capable of targeting KCa1.1 and CaV1.2 channels, the expression of which is altered in hypertension, the in vitro vascular effects of a series of flavonoids extracted from the heartwoods, roots, and leaves of Dalbergia tonkinensis Prain, widely used in traditional medicine, were assessed. Rat aorta rings, tail artery myocytes, and docking and molecular dynamics simulations were used to analyse their effect on these channels. Formononetin, orobol, pinocembrin, and biochanin A showed a marked myorelaxant activity, particularly in rings stimulated by moderate rather than high KCl concentrations. Ba2+ currents through CaV1.2 channels (IBa1.2) were blocked in a concentration-dependent manner by sativanone, 3′-O-methylviolanone, pinocembrin, and biochanin A, while it was stimulated by ambocin. Sativanone, dalsissooside, and eriodictyol inhibited, while tectorigenin 7-O-[β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside], ambocin, butin, and biochanin A increased IKCa1.1. In silico analyses showed that biochanin A, sativanone, and pinocembrin bound with high affinity in target-sensing regions of both channels, providing insight into their potential mechanism of action. In conclusion, Dalbergia tonkinensis is a valuable source of mono- and bifunctional, vasoactive scaffolds for the development of novel antihypertensive drugs.
Collapse
Affiliation(s)
- Nguyen Manh Cuong
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi 122100, Vietnam
- Correspondence: (N.M.C.); (F.F.)
| | - Ninh The Son
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi 122100, Vietnam;
| | - Ngu Truong Nhan
- Faculty of Science and Technology, Tay Nguyen University, 567 Le Duan, Ea Tam, Buon Ma Thuot 630000, Vietnam;
| | - Yoshiyasu Fukuyama
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan;
| | - Amer Ahmed
- Dipartimento di Scienze della Vita, Università di Siena, Via A. Moro 2, 53100 Siena, Italy; (A.A.); (S.S.)
| | - Simona Saponara
- Dipartimento di Scienze della Vita, Università di Siena, Via A. Moro 2, 53100 Siena, Italy; (A.A.); (S.S.)
| | - Alfonso Trezza
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy; (A.T.); (B.G.); (G.V.); (O.S.)
| | - Beatrice Gianibbi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy; (A.T.); (B.G.); (G.V.); (O.S.)
| | - Ginevra Vigni
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy; (A.T.); (B.G.); (G.V.); (O.S.)
| | - Ottavia Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy; (A.T.); (B.G.); (G.V.); (O.S.)
| | - Fabio Fusi
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy; (A.T.); (B.G.); (G.V.); (O.S.)
- Correspondence: (N.M.C.); (F.F.)
| |
Collapse
|
10
|
Functional, electrophysiology, and molecular dynamics analysis of quercetin-induced contraction of rat vascular musculature. Eur J Pharmacol 2022; 918:174778. [DOI: 10.1016/j.ejphar.2022.174778] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 01/14/2022] [Accepted: 01/24/2022] [Indexed: 12/21/2022]
|
11
|
Dias CJ, Costa HA, Alves Dias-Filho CA, Ferreira AC, Rodrigues B, Irigoyen MC, Romão Borges AC, de Andadre Martins V, Branco Vidal FC, Ribeiro RM, Filho NS, Mostarda CT. Carvacrol reduces blood pressure, arterial responsiveness and increases expression of MAS receptors in spontaneously hypertensive rats. Eur J Pharmacol 2021; 917:174717. [PMID: 34953800 DOI: 10.1016/j.ejphar.2021.174717] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 12/09/2021] [Accepted: 12/20/2021] [Indexed: 12/28/2022]
Abstract
AIM To analyze the effect of the use of carvacrol in the cardiovascular system of spontaneously hypertensive rats (SHR). METHODS Methods: Twenty animals were allocated in four groups, one group control Wistar receiving only sorbitol, used as vehicle of administration of the carvacrol (Wistar-Vehicle), one control group SHR, also receive only sorbitol (SHR-Vehicle), a third, treated with losartan (SHR-Losartan/50 mg/kg), and the fourth, treated with carvacrol (SHR - Carvacrol/20 mg/kg). Sorbitol, losartan and carvacrol were administered by oral gavage daily for 30-day. Hemodynamic variables, vascular reactivity, biochemical parameters, and expression of Mas and AT1 receptors in kidney tissues were analyzed. RESULTS SHR- Carvacrol group showed a maximal effect of inhibition of 56% in the curve of norepinephrine. The Emax of the curves with Ca2+ were smaller in the groups SHR-losartan (40.17%) and SHR-carvacrol (35.71%) when compared to the SHR-Vehicle. The carvacrol increased the expression of the MAS receptors in kidney tissue. CONCLUSION Thirty days of treatment with carvacrol showed an antihypertensive effect associated with less peripheral vascular resistance. Also, treatment with carvacrol increased the expression of MAS receptors in kidney tissue.
Collapse
Affiliation(s)
- Carlos José Dias
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil; Cardiorenal Adaptations to Exercise Laboratory (LACE), Federal University of Maranhão, Pinheiro /Maranhao, Brazil
| | - Herikson Araújo Costa
- Health Sciences Graduate Program, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Carlos Alberto Alves Dias-Filho
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil
| | - Andressa Coelho Ferreira
- Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil; Graduate Program in Adult Health, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Bruno Rodrigues
- Physical Education College, State University of Campinas, Campinas/St Paul, Brazil
| | - Maria Claudia Irigoyen
- Department of Cardiopneumology, Faculty of Medicine of USP, InCor Experimental Hypertension Laboratory, St Paul/St Paul, Brazil
| | - Antônio Carlos Romão Borges
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Department of Physiological Sciences, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Vicenilma de Andadre Martins
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | | | - Rachel Melo Ribeiro
- Department of Physiological Sciences, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Natalino Salgado Filho
- Health Sciences Graduate Program, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Cristiano T Mostarda
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil; Postgraduate Program in Physical Education, Federal University of Maranhao, St. Luis /Maranhao, Brazil; Graduate Program in Adult Health, Federal University of Maranhao, St. Luis /Maranhao, Brazil.
| |
Collapse
|
12
|
Cherfi M, Dib I, Harit T, Ziyyat A, Malek F. Synthesis and characterization of new pyrazole-tetrazole derivatives as new vasorelaxant agents. Drug Dev Res 2021; 82:1055-1062. [PMID: 33713468 DOI: 10.1002/ddr.21812] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 02/22/2021] [Accepted: 02/28/2021] [Indexed: 11/11/2022]
Abstract
The synthesis of new functionalized tetrazole-pyrazole compounds is reported. They were fully characterized by spectroscopy and spectrometry methods. The vasorelaxant potency of these molecules was also investigated. All compounds showed a good vasorelaxant activity but the Compound 6 "ethyl 1-((2-(3-bromopropyl)-2H-tetrazol-5-yl)methyl)-5-methyl-1H-pyrazole-3-carboxylate" seems to have the highest effect, which reached 70% at 10-4 M concentration. This effect was partially endothelium-dependent; also, the vasorelaxant pattern of this compound was quite similar to that of the verapamil.
Collapse
Affiliation(s)
- Mounir Cherfi
- Laboratory of Applied Chemistry and Environment-ECOMP, Faculty of Sciences, Mohammed First University Bd Mohamed VI, Oujda, Morocco
| | - Ikram Dib
- Laboratory of Bioresources, Biotechnology, Ethnopharmacology and Health, Faculty of Sciences, Mohammed I University, Oujda, Morocco
| | - Tarik Harit
- Laboratory of Applied Chemistry and Environment-ECOMP, Faculty of Sciences, Mohammed First University Bd Mohamed VI, Oujda, Morocco
| | - Abderrahim Ziyyat
- Laboratory of Bioresources, Biotechnology, Ethnopharmacology and Health, Faculty of Sciences, Mohammed I University, Oujda, Morocco
| | - Fouad Malek
- Laboratory of Applied Chemistry and Environment-ECOMP, Faculty of Sciences, Mohammed First University Bd Mohamed VI, Oujda, Morocco
| |
Collapse
|
13
|
A multitarget semi-synthetic derivative of the flavonoid morin with improved in vitro vasorelaxant activity: Role of Ca V1.2 and K Ca1.1 channels. Biochem Pharmacol 2021; 185:114429. [PMID: 33513341 DOI: 10.1016/j.bcp.2021.114429] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/28/2020] [Accepted: 01/19/2021] [Indexed: 12/24/2022]
Abstract
CaV1.2 channels play a fundamental role in the regulation of vascular smooth muscle tone. The aim of the present study was to synthesize morin derivatives bearing the nitrophenyl moiety of dihydropyridine Ca2+ antagonists to increase the flavonoid vasorelaxant activity. The effects of morin and its derivatives were assessed on CaV1.2 and KCa1.1 channels, both in vitro and in silico, as well as on the contractile responses of rat aorta rings. All compounds were effective CaV1.2 channel blockers, positioning in the α1C subunit region where standard blockers bind. Among the four newly synthesized morin derivatives, the penta-acetylated morin-1 was the most efficacious Ca2+ antagonist, presenting a vasorelaxant profile superior to that of the parent compound and, contrary to morin, antagonized also the release of Ca2+ from the sarcoplasmic reticulum; surprisingly, it also stimulated KCa1.1 channel current. Computational analysis demonstrated that morin-1 bound close to the KCa1.1 channel S6 segment. In conclusion, these findings open a new avenue for the synthesis of valuable multi-functional, vasorelaxant morin derivatives capable to target several pathways underpinning the pathogenesis of hypertension.
Collapse
|
14
|
In vitro vascular toxicity assessment of NitDOX, a novel NO-releasing doxorubicin. Eur J Pharmacol 2020; 880:173164. [PMID: 32437742 DOI: 10.1016/j.ejphar.2020.173164] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 04/23/2020] [Accepted: 05/04/2020] [Indexed: 12/16/2022]
Abstract
The conjugation of doxorubicin (DOX) with nitric oxide (NO)-releasing groups gave rise to novel anthracyclines, such as nitrooxy-DOX (NitDOX), capable to overcome multidrug resistance. The widely described anthracycline cardiovascular toxicity, however, might limit their clinical use. This study aimed to investigate NitDOX-induced effects, as potential hazard, on vascular smooth muscle A7r5 and endothelial EA.hy926 cell viability, on the mechanical activity of freshly and cultured rat aorta rings, as well as on Cav1.2 channels of A7r5 cells. DOX was used as a reference compound. Although an increase in intracellular radicals and a reduction in mitochondrial potential occurred upon treatment with both drugs, A7r5 and EA.hy926 cells proved to be more sensitive to DOX than to NitDOX. Both compounds promoted comparable effects in A7r5 cells, whereas NitDOX was less active than DOX in inducing DNA damage and in eliciting apoptotic-mediated cell death revealed as an increase in sub-diploid-, DAPI- and annexin V-positive- EA.hy926 cell percentage. Moreover, in EA.hy926 cells, NitDOX doubled basal NO content, while preincubation with the NO-scavenger PTIO increased NitDOX-induced cytotoxicity. DOX exhibited a negligible contracturing effect in endothelium-intact rings, while NitDOX induced a significant ODQ-sensible, vasodilation in endothelium-denuded rings. In arteries cultured with both drugs for 7 days, NitDOX prevented either phenylephrine- or KCl-induced contraction at a concentration 10-fold higher than that of DOX. These results demonstrate that NitDOX displays a more favourable vascular toxicity profile than DOX. Taking into account its greater efficacy against drug-resistant cells, NitDOX is worth of further investigations in preclinical and clinical settings.
Collapse
|
15
|
Vasoactivity of Mantonico and Pecorello grape pomaces on rat aorta rings: An insight into nutraceutical development. J Funct Foods 2019. [DOI: 10.1016/j.jff.2019.04.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
|
16
|
Chen C, Guo C, Gao J, Shi K, Cheng J, Zhang J, Chen S, Liu Y, Liu A. Vasorelaxant and antihypertensive effects of Tianshu Capsule on rats: An in vitro and in vivo approach. Biomed Pharmacother 2019; 111:188-197. [DOI: 10.1016/j.biopha.2018.12.061] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 12/02/2018] [Accepted: 12/14/2018] [Indexed: 02/06/2023] Open
|
17
|
MC225, a Novel Probe for P-glycoprotein PET Imaging at the Blood-brain Barrier: In Vitro Cardiovascular Safety Evaluation. J Cardiovasc Pharmacol 2018; 70:405-410. [PMID: 28877068 DOI: 10.1097/fjc.0000000000000536] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The P-glycoprotein (P-gp) substrate MC225, at concentrations ≤10 nM, is a valuable radiotracer for positron emission tomography imaging of P-gp function in rats and mice. The aim of this study was to evaluate its potential toxic hazard toward the cardiovascular system through an in-depth analysis of its effects on rat aorta rings, on CaV1.2 channel current (ICa1.2) of A7r5 cells and on Langendorff-perfused rat heart. In aortic rings, MC225 relaxed phenylephrine-induced contraction in a concentration-dependent and endothelium-independent manner, with an IC50 value of about 1 μM. At concentrations ≥3 μM, it antagonized the response to cumulative concentrations of K. MC225, 1 and 10 μM, inhibited ICa1.2 by 15% and 31%, respectively, without affecting either current activation or inactivation kinetics. In Langendorff-perfused rat hearts, only 10 μM MC225 significantly decreased left ventricular pressure and increased coronary perfusion pressure while reducing heart rate and prolonging the cardiac cycle length as well as the atrioventricular conduction time (PQ interval) on the electrocardiogram. Lower concentrations of the drug were ineffective. These findings demonstrate that MC225-induced cardiovascular effects took place at concentrations that are at least 2 orders of magnitude higher than those allowing in vivo measurement of P-gp function. Therefore, MC225 represents a promising positron emission tomography tool for in vivo straightforward P-gp quantification.
Collapse
|
18
|
Sargazi Zadeh G, Panahi N. Endothelium-independent vasorelaxant activity of Trachyspermum ammi essential oil on rat aorta. Clin Exp Hypertens 2017; 39:133-138. [PMID: 28287882 DOI: 10.1080/10641963.2016.1235178] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Several pharmacological activities of the essential oil of Trachyspermum ammi seeds (TAEO) have been previously studied. These include antitussive, antihypertensive, and antispasmodic effects. However, its action on isolated aorta has not yet been studied. This study was aimed to investigate the vasorelaxant activity of TAEO and characterize its mechanism of action. Extraction of TAEO was performed using Clevenger-type apparatus with the final content of 4.5% (v/w). To evaluate some probable mechanisms of action of TAEO, the action isometric tension was then measured in the aortic rings from Wistar rats which were precontracted with phenylephrine (PHE) (1 µM) or KCl (60 mM). The major constituents of TAEO included Thymol (38.1%), gamma-terpinene (33.3%), and p-cymene (23.1%), as was analyzed by GC-MS. The cumulative concentrations of TAEO reduced precontraction caused by PHE and KCl (p < 0.05) significantly, which was dose dependent. The vasorelaxation caused by TAEO was not influenced in the presence of methylene blue and L-NAME in the endothelium-intact and denuded aorta ring. The inhibitory effect of TAEO on the aortic rings precontracted with KCl and PHE was considerably reduced by nifedipine. These findings hypothesized that the vasorelaxation caused by TAEO is completely endothelium independent and the extracellular Ca2+ influx was also inhibited by TAEO.
Collapse
Affiliation(s)
- G Sargazi Zadeh
- a Department of Veterinary Basic Sciences, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - N Panahi
- a Department of Veterinary Basic Sciences, Science and Research Branch , Islamic Azad University , Tehran , Iran
| |
Collapse
|
19
|
Fusi F, Durante M, Spiga O, Trezza A, Frosini M, Floriddia E, Teodori E, Dei S, Saponara S. In vitro and in silico analysis of the vascular effects of asymmetrical N,N-bis(alkanol)amine aryl esters, novel multidrug resistance-reverting agents. Naunyn Schmiedebergs Arch Pharmacol 2016; 389:1033-43. [PMID: 27351883 DOI: 10.1007/s00210-016-1266-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 06/16/2016] [Indexed: 12/11/2022]
Abstract
Asymmetrical N,N-bis(alkanol)amine aryl esters (FRA77, GDE6, and GDE19) are potent multidrug resistance (MDR) reversers. Their structures loosely remind that of the Ca(2+) antagonist verapamil. Therefore, the aim of this study was to investigate their vascular activity in vitro. Their effects on the mechanical activity of fresh and cultured rat aorta rings on Cav1.2 channel current (I Ca1.2) of A7r5 cells and their cytotoxicity on A7r5 and EA.hy926 cells were analyzed. Docking at the rat α1C subunit of the Cav1.2 channel was simulated in silico. Compounds tested were cytotoxic at concentrations >1 μM (FRA77, GDE6, GDE19) and >10 μM (verapamil) in EA.hy926 cells, or >10 μM (FRA77, GDE6, GDE19) and at 100 μM (verapamil) in A7r5 cells. In fresh rings, the three compounds partly antagonized phenylephrine and 60 mM K(+) (K60)-induced contraction at concentrations ≥1 and ≥3 μM, respectively. On the contrary, verapamil fully relaxed rings pre-contracted with both agents. In cultured rings, 10 μM GDE6, GDE19, FRA77, and verapamil significantly reduced the contractile response to both phenylephrine and K60. Similarly to verapamil, the three compounds docked at the α1C subunit, interacting with the same amino acids residues. FRA77, GDE6, and GDE19 inhibited I Ca1.2 with IC50 values 1 order of magnitude higher than that of verapamil. FRA77-, GDE6-, and GDE19-induced vascular effects occurred at concentrations that are at least 1 order of magnitude higher than those effectively reverting MDR. Though an unambiguous divergence between MDR reverting and vascular activity is of overwhelming importance, these findings consistently contribute to the design and synthesis of novel and potent chemosensitizers.
Collapse
Affiliation(s)
- F Fusi
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Via A. Moro 2, 53100, Siena, Italy
| | - M Durante
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Via A. Moro 2, 53100, Siena, Italy
| | - O Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università degli Studi di Siena, via A. Moro 2, 53100, Siena, Italy
| | - A Trezza
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università degli Studi di Siena, via A. Moro 2, 53100, Siena, Italy
| | - M Frosini
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Via A. Moro 2, 53100, Siena, Italy
| | - E Floriddia
- Dipartimento NEUROFARBA-Sezione di Farmaceutica e Nutraceutica, Università di Firenze, via Ugo Schiff 6, 50019, Sesto Fiorentino, Italy
| | - E Teodori
- Dipartimento NEUROFARBA-Sezione di Farmaceutica e Nutraceutica, Università di Firenze, via Ugo Schiff 6, 50019, Sesto Fiorentino, Italy
| | - S Dei
- Dipartimento NEUROFARBA-Sezione di Farmaceutica e Nutraceutica, Università di Firenze, via Ugo Schiff 6, 50019, Sesto Fiorentino, Italy
| | - S Saponara
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Via A. Moro 2, 53100, Siena, Italy.
| |
Collapse
|
20
|
Saponara S, Durante M, Spiga O, Mugnai P, Sgaragli G, Huong TT, Khanh PN, Son NT, Cuong NM, Fusi F. Functional, electrophysiological and molecular docking analysis of the modulation of Cav 1.2 channels in rat vascular myocytes by murrayafoline A. Br J Pharmacol 2015; 173:292-304. [PMID: 26493241 DOI: 10.1111/bph.13369] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 10/01/2015] [Accepted: 10/10/2015] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND AND PURPOSE The carbazole alkaloid murrayafoline A (MuA) enhances contractility and the Ca(2+) currents carried by the Cav 1.2 channels [ICa1.2 ] of rat cardiomyocytes. As only few drugs stimulate ICa1.2 , this study was designed to analyse the effects of MuA on vascular Cav 1.2 channels. EXPERIMENTAL APPROACH Vascular activity was assessed on rat aorta rings mounted in organ baths. Cav 1.2 Ba(2+) current [IBa1.2 ] was recorded in single rat aorta and tail artery myocytes by the patch-clamp technique. Docking at a 3D model of the rat, α1c central pore subunit of the Cav 1.2 channel was simulated in silico. KEY RESULTS In rat aorta rings MuA, at concentrations ≤14.2 μM, increased 30 mM K(+) -induced tone and shifted the concentration-response curve to K(+) to the left. Conversely, at concentrations >14.2 μM, it relaxed high K(+) depolarized rings and antagonized Bay K 8644-induced contraction. In single myocytes, MuA stimulated IBa1.2 in a concentration-dependent, bell-shaped manner; stimulation was stable, incompletely reversible upon drug washout and accompanied by a leftward shift of the voltage-dependent activation curve. MuA docked at the α1C subunit central pore differently from nifedipine and Bay K 8644, although apparently interacting with the same amino acids of the pocket. Neither Bay K 8644-induced stimulation nor nifedipine-induced block of IBa1.2 was modified by MuA. CONCLUSIONS AND IMPLICATIONS Murrayafoline A is a naturally occurring vasoactive agent able to modulate Cav 1.2 channels and dock at the α1C subunit central pore in a manner that differed from that of dihydropyridines.
Collapse
Affiliation(s)
- S Saponara
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Siena, Italy
| | - M Durante
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Siena, Italy
| | - O Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università degli Studi di Siena, Siena, Italy
| | - P Mugnai
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Siena, Italy
| | - G Sgaragli
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Siena, Italy
| | - T T Huong
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - P N Khanh
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - N T Son
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - N M Cuong
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - F Fusi
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, Siena, Italy
| |
Collapse
|
21
|
Antihypertensive Effect of Syzygium cumini in Spontaneously Hypertensive Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:605452. [PMID: 25614751 PMCID: PMC4295347 DOI: 10.1155/2014/605452] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 12/04/2014] [Indexed: 11/18/2022]
Abstract
This study evaluated the in vivo potential antihypertensive effect of hydroalcoholic extract of Syzygium cumini leaves (HESC) in normotensive Wistar rats and in spontaneously hypertensive rats (SHR), as well as its in vitro effect on the vascular reactivity of resistance arteries. The hypotensive effect caused by intravenous infusion of HESC (0.01-4.0 mg/kg) in anesthetized Wistar rats was dose-dependent and was partially inhibited by pretreatment with atropine sulfate. SHR received HESC (0.5 g/kg/day), orally, for 8 weeks and mean arterial pressure, heart rate, and vascular reactivity were evaluated. Daily oral administration of HESC resulted in a time-dependent blood pressure reduction in SHR, with a maximum reduction of 62%. In the endothelium-deprived superior mesenteric arteries rings the treatment with HESC reduced by 40% the maximum effect (E max) of contraction induced by NE. The contractile response to calcium and NE of endothelium-deprived mesenteric rings isolated from untreated SHR was reduced in a concentration-dependent manner by HESC (0.1, 0.25, and 0.5 mg/mL). This study demonstrated that Syzygium cumini reduces the blood pressure and heart rate of SHR and that this antihypertensive effect is probably due to the inhibition of arterial tone and extracellular calcium influx.
Collapse
|
22
|
Macêdo CL, Vasconcelos LHC, de Correia ACC, Martins IRR, de Lira DP, de O Santos BV, de A Cavalcante F, Silva BAD. Mechanisms underlying vasorelaxation induced in rat aorta by galetin 3,6-dimethyl ether, a flavonoid from Piptadenia stipulacea (Benth.) Ducke. Molecules 2014; 19:19678-95. [PMID: 25438079 PMCID: PMC6271539 DOI: 10.3390/molecules191219678] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 11/17/2014] [Accepted: 11/17/2014] [Indexed: 11/20/2022] Open
Abstract
In this study, we investigated the relaxant action of galetin 3,6-dimethyl ether (FGAL) on rat aorta. The flavonoid relaxed both PMA‑ and phenylephrine (Phe)-induced contractions (pD2 = 5.36 ± 0.11 and 4.17 ± 0.10, respectively), suggesting the involvement of PKC and Phe pathways or α1 adrenergic receptor blockade. FGAL inhibited and rightward shifted Phe-induced cumulative concentration‑response curves, indicating a noncompetitive antagonism of α1 adrenergic receptors. The flavonoid was more potent in relaxing 30 mM KCl- than 80 mM KCl-induced contractions (pD2 = 5.50 ± 0.22 and 4.37 ± 0.12). The vasorelaxant potency of FGAL on Phe-induced contraction was reduced in the presence of 10 mM TEA+. Furthermore, in the presence of apamin, glibenclamide, BaCl2 or 4-AP, FGAL-induced relaxation was attenuated, indicating the participation of small conductance calcium-activated K+ channels (SKCa), ATP-sensitive K+ channels (KATP), inward rectifier K+ channels (Kir) and voltage-dependent K+ channels (KV), respectively. FGAL inhibited and rightward shifted CaCl2-induced cumulative concentration-response curves in both depolarizing medium (high K+) and in the presence of verapamil and phenylephrine, suggesting inhibition of Ca2+ influx through voltage-gated calcium channels (CaV) and receptor operated channels (ROCs), respectively. Likewise, FGAL inhibited Phe-induced contractions in Ca2+-free medium, indicating inhibition of Ca2+ release from the sarcoplasmic reticulum (SR). FGAL potentiated the relaxant effect of aminophylline and sildenafil but not milrinone, suggesting the involvement of phosphodiesterase V (PDE V). Thus, the FGAL vasorelaxant mechanism involves noncompetitive antagonism of α1 adrenergic receptors, the non-selective opening of K+ channels, inhibition of Ca2+ influx through CaV or ROCs and the inhibition of intracellular Ca2+ release. Additionally, there is the involvement of cyclic nucleotide pathway, particularly through PDE V inhibition.
Collapse
Affiliation(s)
- Cibério L Macêdo
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Luiz H C Vasconcelos
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Ana C C de Correia
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Italo R R Martins
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Daysianne P de Lira
- Departamento de Farmácia, Faculdade Santa Maria (FSM), Cajazeiras, PB 58900-000, Brazil.
| | - Bárbara V de O Santos
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Fabiana de A Cavalcante
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Bagnólia A da Silva
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, PB 58051-900, Brazil.
| |
Collapse
|
23
|
Machado NT, Maciel PM, Alustau MC, Queiroz TM, Furtado FF, Assis VL, Veras RC, Araújo IG, Athayde-Filho PF, Medeiros IA. Nitric oxide as a target for the hypotensive and vasorelaxing effects induced by (Z)-ethyl 12-nitrooxy-octadec-9-enoate in rats. Eur J Pharm Sci 2014; 62:317-25. [DOI: 10.1016/j.ejps.2014.06.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 04/16/2014] [Accepted: 06/13/2014] [Indexed: 10/25/2022]
|
24
|
Cuong NM, Khanh PN, Huyen PT, Duc HV, Huong TT, Ha VT, Durante M, Sgaragli G, Fusi F. Vascular L-type Ca²⁺ channel blocking activity of sulfur-containing indole alkaloids from Glycosmis petelotii. JOURNAL OF NATURAL PRODUCTS 2014; 77:1586-1593. [PMID: 24949913 DOI: 10.1021/np500076v] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In the search for novel natural compounds endowed with potential antihypertensive activity, a new sulfur-containing indole alkaloid, N-demethylglypetelotine (2), and its known analogue glypetelotine (1), were isolated from the leaves of Glycosmis petelotii. Their structures were established on the basis of spectroscopic evidence. The two alkaloids were assessed for vasorelaxing activity on rat aorta rings and for L-type Ba(2+) current [I(Ba(L))] blocking activity on single myocytes isolated from rat tail artery. Both glypetelotine and N-demethylglypetelotine inhibited phenylephrine-induced contraction with IC50 values of 20 and 50 μM, respectively. The presence of endothelium did not modify their spasmolytic effect. Neither glypetelotine nor N-demethylglypetelotine affected Ca(2+) release from the sarcoplasmic reticulum induced by phenylephrine. The spasmolytic effect of glypetelotine increased with membrane depolarization. In the presence of 60 mM K(+), both compounds inhibited, in a concentration-dependent manner, the contraction induced by cumulative addition of Ca(2+), this inhibition being inversely related to Ca(2+) concentration. Glypetelotine and, less efficiently N-demethylglypetelotine, inhibited I(Ba(L)), the former compound also affecting I(Ba(L)) kinetics. In conclusion, glypetelotine is a novel vasorelaxing agent which antagonizes L-type Ca(2+) channels.
Collapse
Affiliation(s)
- Nguyen Manh Cuong
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet Street, 122100 Cau Giay, Hanoi Vietnam
| | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Arcanjo DDR, Costa-Júnior JSD, Moura LHP, Ferraz ABF, Rossatto RR, David JM, Quintans-Júnior LJ, Oliveira RDCM, Citó AMDGL, Oliveira APD. Garcinielliptone FC, a polyisoprenylated benzophenone fromPlatonia insignisMart., promotes vasorelaxant effect on rat mesenteric artery. Nat Prod Res 2014; 28:923-7. [DOI: 10.1080/14786419.2014.889136] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
26
|
Martins IRR, Dos Santos RF, de C Correia AC, de Oliveira GA, Macêdo CL, de S Monteiro F, Dos Santos PF, de A Cavalcante F, Tavares JF, da Silva BA. Relaxant effect of Ent-7α-hydroxytrachyloban-18-oic acid, a trachylobane diterpene from Xylopia langsdorfiana A. St-Hil. & Tul., on tracheal smooth muscle. J Smooth Muscle Res 2013; 49:15-25. [PMID: 23832615 PMCID: PMC5137274 DOI: 10.1540/jsmr.49.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Ent-7α-hydroxytrachyloban-18-oic acid, a trachylobane diterpene from
Xylopia langsdorfiana, has previously been shown to relax the
guinea-pig trachea in a concentration-dependent manner. In this study we aimed to
elucidate the mechanisms underlying this action and so contribute to the discovery of
natural products with therapeutic potential. A possible interaction between diterpene and
the Ca2+-calmodulin complex was eliminated as chlorpromazine (10-6
M), a calmodulin inhibitor, did not significantly alter the diterpene-induced relaxation
(pD2 = 4.38 ± 0.07 and 4.25 ± 0.07; mean ± S.E.M., n=5).
Trachylobane-318 showed a higher relaxant potency when the trachea was contracted by 18 mM
KCl than it did with 60 mM KCl (pD2 = 4.90 ± 0.25 and 3.88 ± 0.01,
n=5), suggesting the possible activation of K+ channels.
This was confirmed, as in the presence of 10 mM TEA+ (a non-selective
K+ channel blocker), diterpene relaxation potency was significantly reduced
(pD2 = 4.38 ± 0.07 to 4.01 ± 0.06, n=5). Furthermore,
K+ channel subtypes KATP, KV, SKCa and
BKCa seem to be modulated positively by trachylobane-318 (pD2 =
3.91 ± 0.003, 4.00 ± 0.06, 3.45 ± 0.14 and 3.80 ± 0.05, n=5) but not the
Kir subtype channel (pD2 = 4.15 ± 0.10, n=5).
Cyclic nucleotides were not involved as the relaxation due to aminophylline
(pD2 = 4.27 ± 0.09, n=5) was not altered in the presence of
3 × 10-5 M trachylobane-318 (pD2 = 4.46 ± 0.08,
n=5). Thus, at a functional level, trachylobane-318 seems to relax the
guinea-pig trachea by positive modulation of K+ channels, particularly the
KATP, KV, SKCa and BKCa subtypes.
Collapse
Affiliation(s)
- Italo R R Martins
- Centro de Ciências da Saúde, Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Involvement of Potassium Channels in Vasorelaxant Effect Induced by Valeriana prionophylla Standl. in Rat Mesenteric Artery. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:147670. [PMID: 24023569 PMCID: PMC3759249 DOI: 10.1155/2013/147670] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2013] [Revised: 07/07/2013] [Accepted: 07/08/2013] [Indexed: 11/17/2022]
Abstract
Assays in vitro and in vivo were performed on extract from roots and leaves from the Valeriana prionophylla Standl. (VPR and VPF, resp.). In phenylephrine (1 μM) precontracted rings, VPR (0.01–300 μg/mL) induced a concentration-dependent relaxation (maximum response (MR) = 75.4 ± 4.0%, EC50 = 5.97 (3.8–9.3) μg/mL, n = 6]); this effect was significantly modified after removal of the endothelium (EC50 = 39.6 (27.2–57.6) μg/mL, P < 0.05). However, VPF-induced vasorelaxation was less effective compared to VPR. When rings were preincubated with L-NAME (100 μM) or indomethacin (10 μM), the endothelium-dependent relaxation induced by VPR was significantly attenuated (MR = 20.9 ± 2.3%, 34.2 ± 2.9%, resp., P < 0.001). In rings denuded endothelium, precontracted with KCl (80 mM), or in preparations pretreated with KCl (20 mM) or tetraethylammonium (1 or 3 mM), the vasorelaxant activity of VPR was significantly attenuated (MR = 40.0 ± 8.2, n = 5; 50.5 ± 6.0%; 49.3 ± 6.4%; 46.8 ± 6.2%; resp., P < 0.01). In contrast, neither glibenclamide (10 μM), barium chloride (30 μM), nor 4-aminopyridine (1 mM) affected VPR-induced relaxation. Taken together, these results demonstrate that hypotension induced by VPR seems to involve, at least in part, a vascular component. Furthermore, endothelium-independent relaxation induced by VPR involves K+ channels activation, most likely due to BKCa channels, in the rat superior mesenteric artery.
Collapse
|
28
|
Fusi F, Durante M, Sgaragli G, Cuong NM, Dung PTP, Nam NH. 2-Aryl- and 2-amido-benzothiazoles as multifunctional vasodilators on rat artery preparations. Eur J Pharmacol 2013; 714:178-87. [PMID: 23751511 DOI: 10.1016/j.ejphar.2013.05.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 05/14/2013] [Accepted: 05/29/2013] [Indexed: 10/26/2022]
Abstract
The neuroprotective agent riluzole [2-amino-6-(trifluoromethoxy)benzothiazole] has been shown to antagonize neuronal high-voltage activated Ca(2+) currents. In the search for novel scaffolds leading to potential antihypertensive agents, a series of 2-aryl- and 2-amido-benzothiazoles (HUP) were assessed for their vasorelaxing property on rat aorta rings and for their L-type Ba(2+) currents [I(Ba(L))] blocking activity on single myocytes isolated from the rat tail artery. HUP5 and HUP30, the most potent of the series, inhibited phenylephrine-induced contraction with IC₅₀ values in the range 3-6 µM. The presence of endothelium did not modify their spasmolytic activity. Both HUP5 and HUP30 increased tissue levels of cGMP and shifted to the left the concentration-response curve to sodium nitroprusside. In rings precontracted by phenylephrine, tetraethylammonium or 1H-[1,2,4] oxadiazolo [4,3-a] quinoxalin-1-one (ODQ) shifted to the right the concentration-relaxation curves of HUP5 and HUP30. The antispasmodic effect of HUP5 and HUP30 was more marked on rings stimulated with 25/30 mM than with 60 mM K(+). HUP5 and HUP30 antagonized both extracellular Ca(2+) influx and Ca(2+) mobilization from intracellular stores in response to phenylephrine: this effect was not modified by the presence of ODQ. I(Ba(L)) was partly inhibited by HUP5 and blocked by HUP30 in a concentration-dependent as well as ODQ-independent manner. In conclusion, HUP5 and HUP30 are vasorelaxing agents that stimulate soluble guanylyl cyclase, activate K(+) channels, and block extracellular Ca(2+) influx. The present benzothiazole derivatives form a novel class of multifunctional vasodilators which may give rise to effective antihypertensive agents.
Collapse
Affiliation(s)
- Fabio Fusi
- Dipartimento di Scienze della Vita, Università di Siena, via A. Moro 2, 53100 Siena, Italy.
| | | | | | | | | | | |
Collapse
|
29
|
Pharmacological Effects of Lactuca serriola L. in Experimental Model of Gastrointestinal, Respiratory, and Vascular Ailments. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:304394. [PMID: 23662127 PMCID: PMC3638630 DOI: 10.1155/2013/304394] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Accepted: 03/12/2013] [Indexed: 11/25/2022]
Abstract
Lactuca serriola L. has traditionally been used in folkloric medicine to manage respiratory, gastrointestinal, and multiple other ailments. The present study was undertaken to explore the effect of methanol extract of L. serriola on isolated rabbit tissue preparations, that is, jejunum, trachea, and aorta in an attempt to validate its folkloric use in traditional medicine for gastrointestinal, respiratory, and vascular ailments. The application of the methanol extract to isolated rabbit jejunum preparations exhibited concentration-dependent spasmogenic effect (0.03 to 3.0 mg/mL), but interestingly further increase in concentration (5.0 mg/mL) resulted in complete spasmolytic effect. The pretreatment of the tissue preparations with atropine (0.1 μM) caused the suppression of the contractile response. Moreover, the same extract also caused relaxation of K+-(80 mM) induced spastic contractions of isolated rabbit jejunum preparations (5.0 mg/mL) and shifted the Ca++ dose response curves towards right at concentration range of 0.3–1.0 mg/mL. Similarly, the extract application to isolated rabbit tracheal preparations relaxed the carbachol-(1 μM) induced (0.3–1.0 mg/mL) as well as K+-(80 mM) induced contractions (3.0 mg/mL). Furthermore, it relaxed the phenylephrine (1 μM)-induced contractions in isolated rabbit aorta preparations (3.0 mg/mL) and K+ (80 mM)-induced contractions (1.0 mg/mL). These effects were found comparable to that of dicyclomine, as an antagonist of muscarinic receptors as well as a possible Ca++ channel blocker. The previously mentioned findings may partially justify the folkloric use of Lactuca serriola in the management of conditions pertaining to spasm of intestine, bronchioles, and vasculature.
Collapse
|
30
|
Assis ÁCL, Araújo IGA, Lima RPC, Almeida MM, Marinho AF, Barbosa-Filho JM, Cruz JS, Silva DF, Medeiros IA. Warifteine, a bisbenzylisoquinoline alkaloid, induces relaxation by activating potassium channels in vascular myocytes. Clin Exp Pharmacol Physiol 2012; 40:37-44. [DOI: 10.1111/1440-1681.12029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2012] [Revised: 10/17/2012] [Accepted: 10/21/2012] [Indexed: 01/01/2023]
Affiliation(s)
| | | | - Renata PC Lima
- Laboratory of Pharmaceutical Technology, Federal University of Paraíba, João Pessoa; João Pessoa; Brazil
| | - Mônica M Almeida
- Laboratory of Pharmaceutical Technology, Federal University of Paraíba, João Pessoa; João Pessoa; Brazil
| | - Alexsandro F Marinho
- Laboratory of Pharmaceutical Technology, Federal University of Paraíba, João Pessoa; João Pessoa; Brazil
| | - José M Barbosa-Filho
- Laboratory of Pharmaceutical Technology, Federal University of Paraíba, João Pessoa; João Pessoa; Brazil
| | - Jader S Cruz
- Institute of Biological Sciences; Federal University of Minas Gerais; Belo Horizonte; Brazil
| | - Darizy F Silva
- Department of Bioregulation; Federal University of Bahia; Salvador; Brazil
| | - Isac A Medeiros
- Laboratory of Pharmaceutical Technology, Federal University of Paraíba, João Pessoa; João Pessoa; Brazil
| |
Collapse
|
31
|
França-Silva MS, Luciano MN, Ribeiro TP, Silva JS, Santos AF, França KC, Nakao LS, Athayde-Filho PF, Braga VA, Medeiros IA. The 2-nitrate-1,3-dibuthoxypropan, a new nitric oxide donor, induces vasorelaxation in mesenteric arteries of the rat. Eur J Pharmacol 2012; 690:170-5. [DOI: 10.1016/j.ejphar.2012.06.043] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 06/19/2012] [Accepted: 06/20/2012] [Indexed: 11/26/2022]
|
32
|
Saponara S, Gorelli B, Tzankova V, Martelli C, Teodori E, Sgaragli G, Fusi F. The novel potent multidrug resistance inhibitors N,N-bis(cyclohexanol)amine aryl esters are devoid of vascular effects. Pharmacology 2011; 88:137-41. [PMID: 21921667 DOI: 10.1159/000330452] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Accepted: 06/16/2011] [Indexed: 11/19/2022]
Abstract
The aim of this study was to investigate the effects of the four isomers (3a, 3b, 3c and 3d) of a novel multidrug resistance-reverting agent - 3,4,5-trimethoxybenzoic acid 4-(methyl-{4-[3-(3,4,5-trimethoxyphenyl)acryloyloxy]cyclohexyl}amino)cyclohexyl ester - on vascular functions in vitro. A comparison of their mechanical and electrophysiological actions in rat aorta rings and single rat tail artery myocytes, respectively, was performed. In rat aorta rings, 3a-d antagonized both 60 mmol/l K(+)- and phenylephrine-induced contraction in a concentration-dependent manner, with maximal relaxation values averaging 50% of controls, 3d being the most effective of the series. The vasorelaxing effect was similar either in presence or absence of intact endothelium. In rat tail artery myocytes, out of the four isomers, only 3a consistently inhibited Ba(2+) current through Ca(v)1.2 channels. Our results provide functional evidence that 3a-d are weak vasorelaxing agents, although at concentrations much higher than those effective for multidrug resistance reversion in cancer cells.
Collapse
Affiliation(s)
- Simona Saponara
- Dipartimento di Neuroscienze, Università degli Studi di Siena, Siena, Italy.
| | | | | | | | | | | | | |
Collapse
|
33
|
Soncini R, Santiago MB, Orlandi L, Moraes GOI, Peloso ALM, dos Santos MH, Alves-da-Silva G, Paffaro VA, Bento AC, Giusti-Paiva A. Hypotensive effect of aqueous extract of Averrhoa carambola L. (Oxalidaceae) in rats: an in vivo and in vitro approach. JOURNAL OF ETHNOPHARMACOLOGY 2011; 133:353-357. [PMID: 20937374 DOI: 10.1016/j.jep.2010.10.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 09/30/2010] [Accepted: 10/02/2010] [Indexed: 05/30/2023]
Abstract
AIM OF THE STUDY Averrhoa carambola L. (Oxalidaceae) leaves are used in Brazilian traditional medicine to treat hypertension. This study was conducted to evaluate the hypotensive effect of the aqueous extract of Averrhoa carambola (AEAc) and its underlying mechanisms in the isolated rat aorta. MATERIALS AND METHODS The effect of AEAc on the mean arterial pressure (MAP) was determined in vivo in anesthetized rats. In vitro, thoracic aortic rings were isolated and suspended in organ baths, and the effects of AEAc were studied by means of isometric tension recording experiments. In HPLC analysis, the fingerprint chromatogram of AEAc was established. RESULTS In normotensive rats, AEAc (12.5-50.0 mg/kg, i.v.) induced dose-dependent hypotension. In vitro, AEAc caused a depression in the E(max) response to phenylephrine without a change in sensibility. Also, in a depolarized Ca(2+)-free medium, AEAc inhibited CaCl(2)-induced contractions and caused a concentration-dependent rightward shift of the response curves, indicating that AEAc inhibited the contractile mechanisms involving extracellular Ca(2+) influx. CONCLUSIONS These results demonstrate the hypotensive effects of AEAc, and these effects may, in part, be due to the inhibition of Ca(2+), which supports previous claims of its traditional use.
Collapse
Affiliation(s)
- Roseli Soncini
- Department of Physiological Sciences, Institute of Biomedical Sciences, Federal University of Alfenas, Alfenas-MG, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Araújo-Júnior JX, Nogueira Ribeiro ÊA, Manssour Fraga CA, Lima LM, Barreiro EJ, De Medeiros IA. Cardiovascular effects induced by N-(4'-dihydro)-piperoylthiomorpholine in normotensive rats. J Pharm Pharmacol 2010; 62:1794-800. [DOI: 10.1111/j.2042-7158.2010.01143.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Abstract
Objectives
We have tested the cardiovascular effects of N-(4′-dihydro)-piperoylthiomorpholine (LASSBio 365) on rats using an in-vivo and in-vitro approach.
Methods
LASSBio 365 (0.025, 0.05, 0.1, 0.25, 0.5 or 1 mg/kg, randomly injected) was administered to conscious unrestrained rats and the mean arterial pressure and heart rate were measured. The effects of LASSBio 365 (3 × 10−6–3 × 10−4m) on rat isolated aortic rings with and without endothelium were investigated.
Key findings
LASSBio 365 induced a dose-dependent decrease in mean arterial pressure and heart rate (ED50 = 158 ± 53 µg/kg). The effects evoked by LASSBio 365 (0.5 mg/kg) were inhibited by pretreatment with atropine. In anaesthetized rats, electrocardiogram recordings revealed second/third degree sinoatrial and atrioventricular blockade induced by the compound, which were completely inhibited after cardiac muscarinic blockade or cervical bilateral vagotomy. In rat isolated aortic rings, LASSBio 365 (3 × 10−6–3 × 10−4m) was capable of antagonizing the contractile effects induced by phenylephrine (1 µm) or KCl (80 mm) (IC50 = 107 ± 6; 92 ± 6 µm, respectively). This effect was not inhibited after removal of the vascular endothelium (IC50 = 84 ± 4; 92 ± 10 µm, respectively). LASSBio 365 (10−6–10−4m) antagonized CaCl2-induced contractions in a concentration-dependent manner. Furthermore, LASSBio 365 (98 µm) inhibited contractions produced by noradrenaline (1 µm), but not those induced by caffeine (20 mm).
Conclusions
These results suggested that LASSBio 365 produced negative chronotropism and reduced peripheral resistance that were probably due to the stimulation of cardiac muscarinic pathways. Peripheral vasodilation was probably linked to voltage-dependent Ca2+-channel blockade and/or specific inhibition of Ca2+ release from noradrenaline-sensitive intracellular stores.
Collapse
Affiliation(s)
- João Xavier Araújo-Júnior
- Laboratório de Avaliação e Síntese de Substâncias Bioativas (LASSBio), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro-RJ, Brazil
- Escola de Enfermagem e Farmácia, Universidade Federal de Alagoas, Cidade Universitária, Tabuleiro dos Martins, Maceió-AL, Brazil
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Maceió-AL, Brazil
| | - Êurica Adélia Nogueira Ribeiro
- Escola de Enfermagem e Farmácia, Universidade Federal de Alagoas, Cidade Universitária, Tabuleiro dos Martins, Maceió-AL, Brazil
| | - Carlos Alberto Manssour Fraga
- Laboratório de Avaliação e Síntese de Substâncias Bioativas (LASSBio), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro-RJ, Brazil
| | - Lídia Moreira Lima
- Laboratório de Avaliação e Síntese de Substâncias Bioativas (LASSBio), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro-RJ, Brazil
| | - Eliezer Jesus Barreiro
- Laboratório de Avaliação e Síntese de Substâncias Bioativas (LASSBio), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro-RJ, Brazil
| | | |
Collapse
|
35
|
Fusi F, Ferrara A, Koorbanally C, Crouch NR, Mulholland DA, Sgaragli G. Vascular myorelaxing activity of isolates from South African Hyacinthaceae partly mediated by activation of soluble guanylyl cyclase in rat aortic ring preparations. J Pharm Pharmacol 2010; 60:489-97. [DOI: 10.1211/jpp.60.4.0012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
The vasorelaxing effect of isolates (compounds 1, 2, 3, and 4 (homoisoflavanones), compound 5 (sesquiterpenoid), compounds 6 and 7 (bufadienolides)) from the South African Hyacinthaceae has been assessed using rat aortic ring preparations. Compounds 2, 3, and 4 inhibited the tonic contraction induced by both 60 mm K+ (K60) and phenylephrine, compound 3 being the most potent. Compounds 5, 6, and 7 caused a modest concentration-dependent relaxation, whereas compound 1 was ineffective. Under K25- or K60-induced depolarization, compound 3 displayed antispasmodic effects not reversed by tetraethylammonium. Under precontraction induced with phenylephrine, compound 3 shifted to the left the concentration-relaxation curves of either isoprenaline or sodium nitroprusside. 1 H-[1,2,4] oxidazolol [4,3-a] quinoxalin-1-one shifted to the right the concentration-relaxation curve of compound 3, while 3′-isobutyl-1-methylxanthine had no effect. In the absence of extracellular Ca2+, compound 3 (estimated pIC50 = 4.66) and ryanodine reduced the response to phenylephrine. Phenylephrine-stimulated influx of extracellular Ca2+ was markedly reduced when tissues were pretreated with compound 3 (pIC50 = 5.14) or nifedipine, but stimulated by ryanodine. Compound 3 partially antagonized the contraction induced by phorbol 12-myristate-13-acetate. To our knowledge, this has been the first account describing the vasodilating activity of homoisoflavonoids: compound 3 proved an effective vasorelaxing agent, partly acting via the activation of soluble guanylyl cyclase.
Collapse
Affiliation(s)
- Fabio Fusi
- Dipartimento di Scienze Biomediche, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| | - Antonella Ferrara
- Dipartimento di Scienze Biomediche, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| | - Chantal Koorbanally
- School of Chemistry, Howard College Campus, University of KwaZulu-Natal, Durban, 4041, South Africa
| | - Neil R Crouch
- School of Chemistry, Howard College Campus, University of KwaZulu-Natal, Durban, 4041, South Africa
- Ethnobotany Unit, South African National Biodiversity Institute, P.O. Box 52099, Berea Road, 4007, South Africa
| | - Dulcie A Mulholland
- School of Chemistry, Howard College Campus, University of KwaZulu-Natal, Durban, 4041, South Africa
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford GU2 7XH, UK
| | - Giampietro Sgaragli
- Dipartimento di Scienze Biomediche, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| |
Collapse
|
36
|
Bastos JFA, Moreira IJA, Ribeiro TP, Medeiros IA, Antoniolli AR, De Sousa DP, Santos MRV. Hypotensive and vasorelaxant effects of citronellol, a monoterpene alcohol, in rats. Basic Clin Pharmacol Toxicol 2009; 106:331-7. [PMID: 20002067 DOI: 10.1111/j.1742-7843.2009.00492.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Citronellol is an essential oil constituent from the medicinal plants Cymbopogon citratus, Cymbopogon winterianus and Lippia alba which are thought to possess antihypertensive properties. Citronellol-induced cardiovascular effects were evaluated in this study. In rats, citronellol (1-20 mg/kg, i.v.) induced hypotension, which was not affected by pre-treatment with atropine, hexamethonium, N(omega)-nitro-L-arginine methyl ester hydrochloride or indomethacin, and tachycardia, which was only attenuated by pre-treatment with atropine and hexamethonium. These responses were less than those obtained for nifedipine, a reference drug. In intact rings of rat mesenteric artery pre-contracted with 10 microM phenylephrine, citronellol induced relaxations (pD(2) = 0.71 +/- 0.11; E(max) = 102 +/- 5%; n = 6) that were not affected by endothelium removal, after tetraethylamonium in rings without endothelium pre-contracted with KCl 80 mM. Citronellol strongly antagonized (maximal inhibition = 97 +/- 4%; n = 6) the contractions induced by CaCl(2) (10(-6) to 3 x 10(-3 )M) and did not induce additional effects on the maximal response of nifedipine (10 microM). Finally, citronellol inhibited the contractions induced by 10 microM phenylephrine or 20 mM caffeine. The present results suggest that citronellol lowers blood pressure by a direct effect on the vascular smooth muscle leading to vasodilation.
Collapse
Affiliation(s)
- Joana F A Bastos
- Department of Physiology, Federal University of Sergipe, São Cristóvão-SE, Brazil
| | | | | | | | | | | | | |
Collapse
|
37
|
Adaramoye OA, Anjos RM, Almeida MM, Veras RC, Silvia DF, Oliveira FA, Cavalcante KV, Araújo IG, Oliveira AP, Medeiros IA. Hypotensive and endothelium-independent vasorelaxant effects of methanolic extract from Curcuma longa L. in rats. JOURNAL OF ETHNOPHARMACOLOGY 2009; 124:457-62. [PMID: 19481144 DOI: 10.1016/j.jep.2009.05.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2008] [Revised: 03/21/2009] [Accepted: 05/19/2009] [Indexed: 05/24/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Curcuma longa L. (CL) is a yellow rhizome that is used in African traditional medicine to treat palpitation, hypertension or other related blood circulation disorders. AIM OF THE STUDY To justify the use of CL in ethnomedicine, we investigated the vasorelaxant effect of methanolic extract of CL (CLME) and its underlying mechanisms in isolated rat mesenteric artery. MATERIALS AND METHODS The effect of CLME on the mean arterial pressure (MAP) and heart rate (HR) (pulse interval) were determined in vivo in non-anaesthetized rats. Superior mesenteric rings were isolated, suspended in organ baths containing Tyrode solution at 37 degrees C and gassed with 95% O(2)+5% CO(2), under a resting tension of 0.75 g. The vasorelaxant effects of CLME were studied by means of isometric tension recording experiments. RESULTS In normotensive rats, CLME (10, 20 and 30 mg/kg, i.v.) induced dose-dependent hypotension (2.0+/-0.5%; 27.1+/-5.0% and 26.7+/-4.6%, respectively), and pronounced bradycardia (5.8+/-1.2%, 19.3+/-3.2% and 22.9+/-4.6%, respectively). CLME (1-1000 microg/mL) induced concentration-dependent relaxation of tonic contractions evoked by phenylephrine (Phe) (10 microM) and KCl (80 mM) in rings with intact-endothelium (E(max)=82.3+/-3.2% and 97.7+/-0.7%) or denuded-endothelium (E(max)=91.4+/-1.0% and 97.8+/-1.1%). Also, in a depolarized, Ca(2+) free medium, CLME inhibited CaCl(2) (1 microM-30 mM)-induced contractions and caused a concentration-dependent rightward shift of the response curves, indicating that CLME inhibited the contractile mechanisms involving extracellular Ca(2+) influx. In addition, in Ca(2+) free media containing EGTA (1 mM), CLME inhibited the transient contraction of denuded rings constricted with Phe, but not those evoked by caffeine (20 mM). In contrast, neither glibenclamide, BaCl(2), tetraethylammonium nor 4-aminopyridine affected CLME-induced relaxation. CONCLUSIONS These results demonstrate the hypotensive and bradycardic effects of CLME, as well as its potent vasodilation of rat mesenteric arteries. These effects, may in part, be due to the inhibition of extracellular Ca(2+) influx and/or inhibition of intracellular Ca(2+) mobilization from Phe-sensitive stores.
Collapse
|
38
|
Bova S, Saponara S, Rampa A, Gobbi S, Cima L, Fusi F, Sgaragli G, Cavalli M, de los Rios C, Striessnig J, Bisi A. Anthracene Based Compounds as New L-type Ca2+ Channel Blockers: Design, Synthesis, and Full Biological Profile. J Med Chem 2009; 52:1259-62. [DOI: 10.1021/jm801589x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergio Bova
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Simona Saponara
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Angela Rampa
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Silvia Gobbi
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Lorenzo Cima
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Fabio Fusi
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Giampietro Sgaragli
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Maurizio Cavalli
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Cristobal de los Rios
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Jörg Striessnig
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| | - Alessandra Bisi
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy, Department of Neurosciences, University of Siena, Italy, Department of Pharmaceutical Sciences, University of Bologna, Italy, Department of Pharmacology, School of Medicine, University Autonoma of Madrid, Spain, and Department of Pharmacology and Toxicology, Institute of Pharmacy, Center of Molecular Biosciences, University of Innsbruck, Austria
| |
Collapse
|
39
|
Budriesi R, Ioan P, Locatelli A, Cosconati S, Leoni A, Ugenti MP, Andreani A, Di Toro R, Bedini A, Spampinato S, Marinelli L, Novellino E, Chiarini A. Imidazo[2,1-b]thiazole system: a scaffold endowing dihydropyridines with selective cardiodepressant activity. J Med Chem 2008; 51:1592-600. [PMID: 18303827 DOI: 10.1021/jm070681+] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis, characterization, and functional in vitro assays in cardiac tissues and smooth muscle (vascular and nonvascular) of a number of 4-imidazo[2,1- b]thiazole-1,4-dihydropyridines are reported. The binding properties for the novel compounds have been investigated and the interaction with the binding site common to other aryl-dihydropyridines has been demonstrated. Interestingly, the novel 4-aryl-dihydropyridines are L-type calcium channel blockers with a peculiar pharmacological behavior. Indeed, the imidazo[2,1- b]thiazole system is found to confer to the dihydropyridine scaffold an inotropic and/or chronotropic cardiovascular activity with a high selectivity toward the nonvascular tissue. Finally, molecular modeling studies were undertaken for the most representative compounds with the aim of describing the binding properties of the new ligands at molecular level and to rationalize the found structure-activity relationship data. Due to the observed pharmacological behavior of our compounds, they might be promising agents for the treatment of specific cardiovascular pathologies such as cardiac hypertrophy and ischemia.
Collapse
Affiliation(s)
- Roberta Budriesi
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Bologna, Via Belmeloro 6, Bologna, Italy.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Fusi F, Ferrara A, Sgaragli G, Saponara S. Mechanisms of the antispasmodic activity of 3,5-di-t-butyl catechol (DTCAT) on rat vascular smooth muscles. Eur J Pharmacol 2007; 561:112-20. [PMID: 17292353 DOI: 10.1016/j.ejphar.2006.12.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 12/20/2006] [Accepted: 12/21/2006] [Indexed: 11/15/2022]
Abstract
In skeletal muscle sarcoplasmic reticulum vesicles, 3,5-di-t-butyl catechol (DTCAT) promotes the release of Ca(2+) through the activation of ryanodine receptor Ca(2+) channels. DTCAT mechanical and electrophysiological effects have now been investigated in rat aorta rings and single tail artery myocytes. Rat aorta rings incubated with either 30 microM ryanodine or 100 microM DTCAT developed tension, which averaged 36% and 7%, respectively, of that induced by phenylephrine. DTCAT reduced concentration-dependently both aorta ring contractions to high K(+) (IC(50)=13.5 microM) and L-type Ba(2+) current (IC(50)=22.0 microM) in isolated myocytes. Tetraethylammonium did not reverse the antispasmodic effect of DTCAT in rings stimulated with either 25 or 60 mM K(+). DTCAT relaxed concentration-dependently phenylephrine-pre-contracted rings with intact endothelium (IC(50)=10.9 microM). This effect was markedly reduced by pre-incubation of rings with 100 microM Nomega-nitro-l-arginine methyl ester. DTCAT antagonised phenylephrine-induced contractions in endothelium-deprived rings, either in the presence or in the absence of ryanodine (IC(50)=18.7 microM and 39.8 microM, respectively). Furthermore, both DTCAT (IC(50)=53.3 microM) and ryanodine reduced significantly the response to phenylephrine in the absence of extracellular Ca(2+). Phenylephrine-stimulated influx of extracellular Ca(2+) was markedly inhibited when tissues were pre-treated with DTCAT (IC(50)=19.0 microM) as well as nifedipine. DTCAT (>100 microM) was also able to antagonise the contractions induced by phorbol 12-myristate, 13-acetate. In conclusion, this is the first demonstration that DTCAT inhibits vascular smooth muscle voltage-operated Ca(2+) channels and promotes the release of endothelial nitric oxide. Ryanodine receptor Ca(2+) channels activation or the impairment of the contractile apparatus by DTCAT seem to play a secondary role in its vascular activity.
Collapse
MESH Headings
- Animals
- Aorta/drug effects
- Aorta/metabolism
- Calcium/metabolism
- Calcium Channels/drug effects
- Calcium Channels/metabolism
- Catechols/pharmacology
- Dose-Response Relationship, Drug
- Electrophysiology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Male
- Muscle Contraction/drug effects
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Nitric Oxide/metabolism
- Rats
- Rats, Sprague-Dawley
- Ryanodine/pharmacology
- Ryanodine Receptor Calcium Release Channel/drug effects
- Ryanodine Receptor Calcium Release Channel/metabolism
- Spasm/drug therapy
Collapse
Affiliation(s)
- Fabio Fusi
- Dipartimento di Scienze Biomediche, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy.
| | | | | | | |
Collapse
|
41
|
Santos MRV, Carvalho AA, Medeiros IA, Alves PB, Marchioro M, Antoniolli AR. Cardiovascular effects of Hyptis fruticosa essential oil in rats. Fitoterapia 2007; 78:186-91. [PMID: 17343989 DOI: 10.1016/j.fitote.2006.11.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2005] [Accepted: 11/17/2006] [Indexed: 11/25/2022]
Abstract
In non-anesthetized normotensive rats, Hyptis fruticosa essential oil (HFEO, 5, 10, 20 and 40 mg/kg; i.v.) induced hypotension associated with tachycardia. In intact and isolated rings of rat superior mesenteric artery (control), HFEO (1-1000 microg/ml, n=6, cumulatively) induced concentration-dependent relaxations of tonus induced by 10 microM phenylephrine (Phe) (pD(2)=2.6+/-0.27; E(max)=64+/-8.3%). In denuded endothelium pre-contracted rings with Phe or K(+)-depolarizing solution (80 mM), the concentration-response curves to HFEO were not shifted (pD(2)=2.3+/-0.25 and 2.3+/-0.28, respectively), but their maximal responses were significantly (P<0.05 vs control) increased (E(max)=122.3+/-18.2% and 92+/-3.6%, respectively). HFEO was also capable of antagonizing the concentration-response curves to CaCl(2) (3 microM-30 mM) in a dose-dependent manner.
Collapse
Affiliation(s)
- M R V Santos
- Laboratório de Farmacologia Cardiovascular, Universidade Federal de Sergipe, Av. Marechal Rondon, S/N, Rosa Elze, CEP: 49100-000, São Cristóvão, SE, Brazil.
| | | | | | | | | | | |
Collapse
|
42
|
Lahlou S, Magalhães PJC, de Siqueira RJB, Figueiredo AF, Interaminense LFL, Maia JGS, Sousa PJDC. Cardiovascular effects of the essential oil of Aniba canelilla bark in normotensive rats. J Cardiovasc Pharmacol 2006; 46:412-21. [PMID: 16160591 DOI: 10.1097/01.fjc.0000175876.25296.f4] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Cardiovascular effects of intravenous (i.v.) treatment with the essential oil of the bark of Aniba canelilla (EOAC) were investigated in normotensive rats. In both pentobarbital-anesthetized and conscious rats, i.v. bolus injections of EOAC (1 to 20 mg/kg) elicited similar and dose-dependent hypotension and bradycardia. Pretreatment of anesthetized rats with bilateral vagotomy significantly reduced the bradycardia without affecting the hypotension. In conscious rats, pretreatment with hexamethonium (30 mg/kg, i.v.) significantly reduced the EOAC-induced bradycardia without affecting the hypotension. The opposite effect was observed after i.v. pretreatment with the nitric oxide synthase inhibitor, N-nitro-L-arginine methyl esther (L-NAME, 20 mg/kg). However, both EOAC-induced hypotension and bradycardia were significantly reduced by pretreatment with methylatropine (1 mg/kg, i.v.). In rat endothelium-containing aorta preparations, EOAC (1-600 microg/mL) induced a concentration-dependent reduction of potassium (60 mM)-induced contraction [IC50 (geometric mean+/-95% confidence interval)=64.5 (45.6-91.2) microg/mL)], an effect that was significantly reduced by the addition of atropine (10 microM) in the perfusion medium [IC50=109.5 (72.5-165.4) microg/mL)]. Furthermore, the vasorelaxant effects of the EOAC were also but significantly reduced [IC50=139.1 (105.2-183.9) microg/mL)] by removal of the vascular endothelium. Furthermore, the CaCl2-induced contractions in calcium-free medium were reduced and even fully abolished by EOAC (100 and 600 microg/mL), respectively. However, EOAC (600 microg/mL) was without significant effect on caffeine-induced contractions in calcium-free medium. These data show that i.v. treatment of rats with EOAC induces dose-dependent hypotension and bradycardia, which occurred independently. The bradycardia appears mainly dependent upon the presence of an operational and functional parasympathetic drive to the heart. However, the hypotension is due to an active vascular relaxation rather than withdrawal of sympathetic tone. This relaxation seems partly mediated by an endothelial L-arginine/nitric oxide pathway through peripheral muscarinic receptor activation (endothelium-dependent relaxation) and predominantly through an inhibition of calcium inward current (endothelium-independent relaxation).
Collapse
MESH Headings
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/physiology
- Blood Pressure/drug effects
- Caffeine/pharmacology
- Cardiovascular System/drug effects
- Central Nervous System Stimulants/pharmacology
- Consciousness
- Dose-Response Relationship, Drug
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/physiology
- Heart Rate/drug effects
- Hexamethonium/pharmacology
- In Vitro Techniques
- Injections, Intravenous
- Lauraceae
- Male
- Myocardial Contraction/drug effects
- NG-Nitroarginine Methyl Ester/pharmacology
- Nitric Oxide Synthase/antagonists & inhibitors
- Oils, Volatile/administration & dosage
- Oils, Volatile/isolation & purification
- Oils, Volatile/pharmacology
- Plant Bark/chemistry
- Potassium/pharmacology
- Rats
- Rats, Wistar
- Time Factors
- Vasoconstriction/drug effects
- Vasodilation/drug effects
Collapse
Affiliation(s)
- Saad Lahlou
- Departamento de Fisiologia e Farmacologia, Universidade Federal de Pernambuco, Recife, PE, Brazil.
| | | | | | | | | | | | | |
Collapse
|
43
|
Ozolua R, . EO, . AE. Altered Vascular Reactivity in Isolated Aortic Rings from Potassium-adapted Wistar Rats. INT J PHARMACOL 2006. [DOI: 10.3923/ijp.2006.193.200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
44
|
Mirkhani H, Dirin M, Youssef-Zayeh I. Mechanism of vasoselective action of mebudipine, a new calcium channel blocker. Vascul Pharmacol 2005; 42:23-9. [PMID: 15664884 DOI: 10.1016/j.vph.2004.12.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2004] [Accepted: 12/09/2004] [Indexed: 10/26/2022]
Abstract
In previous studies, mebudipine, a newly synthesized dihydropyridine calcium channel blocker, showed a considerable vasoselective action. To investigate the mechanism of this property, the pattern of inhibitory action on the KCl-induced contraction in isolated rat aortic rings and the effect of changing resting membrane potential on the potency of this compound were considered. In addition, its chronotropic and inotropic actions were also studied. Mebudipine inhibited KCl-induced contractions. Its inhibitory effect was progressive and needed time to reach maximum. Incubation of the aortic rings in depolarizing physiological solution (high potassium, zero calcium) resulted in the augmentation of mebudipine effect. The potency of mebudipine in inhibiting aortic contractions and its time- and voltage-dependent action were significantly greater than those of nifedipine. In comparison with nifedipine, mebudipine showed a greater negative chronotropic effect, but in the case of negative inotropism, the reverse relation was observed. It is concluded that mebudipine has a greater time- and voltage-dependent inhibitory effect, as compared to nifedipine and this property could explain its prominent vasoselective action. It has also marked negative chronotropic effect and minor negative inotropic action. With regard to the above findings, mebudipine might have a selective and protective calcium channel blocking effect in ischemic regions (ischemia-selectivity), and the potential to be used in cardiovascular diseases without causing harmful effects such as reflex tachycardia and heart failure which have sometimes been seen with the older agents.
Collapse
Affiliation(s)
- Hossein Mirkhani
- Department of Pharmacology, School of Medicine, Shiraz University of Medical Sciences, P.O. Box 71345-1649, Shiraz, Iran.
| | | | | |
Collapse
|
45
|
Amos S, Akah PA, Binda L, Enwerem NM, Ogundaini A, Wambebe C, Hussaini IM, Gamaniel KS. Hypotensive activity of the ethanol extract of Pavetta crassipes leaves. Biol Pharm Bull 2005; 26:1674-80. [PMID: 14646169 DOI: 10.1248/bpb.26.1674] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pavetta crassipes leaf is routinely used locally in Nigeria for the management of respiratory disorders and hypertension. The hypotensive and other cardiovascular effects of Pavetta crassipes were investigated in cats and rats. The effects of the extract on rat and cat blood pressures, isolated rat atria, rat portal vein, isolated rat aorta and rat vas deferens were studied. Specific receptor antagonists (atropine, mepyramine, phentolamine, propranolol) were used to elucidate the underlying mechanism(s) involved in the cardiovascular changes induced by P. crassipes. The results revealed that the ethanolic extract of Pavetta crassipes lowered the blood pressures of cats and rats in a dose dependent manner. The extract also caused a concentration-dependent decrease in the force of contraction of the isolated rat atria and rat portal vein. The decreases in blood pressure values were attenuated in the presence of a beta-adrenoceptor antagonist, propranolol. The extract also attenuated isoprenaline-induced contraction of the rat atria. However, the extract did not affect contractions evoked by KCl, norepinephrine and 5-HT on the rat aorta. Pavetta crassipes contains biologically active substances that may be useful in the management of hypertension.
Collapse
Affiliation(s)
- Samson Amos
- Department of Pharmacology and Toxicology, National Institute for Pharmaceutical Research and Development (NIPRD), Nigeria.
| | | | | | | | | | | | | | | |
Collapse
|
46
|
Guedes DN, Silva DF, Barbosa-Filho JM, Medeiros IA. Calcium antagonism and the vasorelaxation of the rat aorta induced by rotundifolone. Braz J Med Biol Res 2004; 37:1881-7. [PMID: 15558195 DOI: 10.1590/s0100-879x2004001200014] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The vasorelaxing activity of rotundifolone (ROT), a major constituent (63.5%) of the essential oil of Mentha x villosa, was tested in male Wistar rats (300-350 g). In isolated rat aortic rings, increasing ROT concentrations (0.3, 1, 10, 100, 300, and 500 microg/ml) inhibited the contractile effects of 1 microM phenylephrine and of 80 or 30 mM KCl (IC50 values, reported as means +/- SEM = 184 +/- 6, 185 +/- 3 and 188 +/- 19 microg/ml, N = 6, respectively). In aortic rings pre-contracted with 1 microM phenylephrine, the smooth muscle-relaxant activity of ROT was inhibited by removal of the vascular endothelium (IC50 value = 235 +/- 7 microg/ml, N = 6). Furthermore, ROT inhibited (pD2 = 6.04, N = 6) the CaCl2-induced contraction in depolarizing medium in a concentration-dependent manner. In Ca2+-free solution, ROT inhibited 1 microM phenylephrine-induced contraction in a concentration-dependent manner and did not modify the phasic contractile response evoked by caffeine (20 mM). In conclusion, in the present study we have shown that ROT produces an endothelium-independent vasorelaxing effect in the rat aorta. The results further indicated that in the rat aorta ROT is able to induce vasorelaxation, at least in part, by inhibiting both: a) voltage-dependent Ca2 channels, and b) intracellular Ca2+ release selectively due to inositol 1,4,5-triphosphate activation. Additional studies are required to elucidate the mechanisms underlying ROT-induced relaxation.
Collapse
Affiliation(s)
- D N Guedes
- Laboratório de Tecnologia Farmacêutica, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
| | | | | | | |
Collapse
|
47
|
Guedes DN, Silva DF, Barbosa-Filho JM, de Medeiros IA. Endothelium-dependent hypotensive and vasorelaxant effects of the essential oil from aerial parts of Mentha x villosa in rats. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2004; 11:490-497. [PMID: 15500259 DOI: 10.1016/j.phymed.2004.04.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Cardiovascular effects of an essential oil from the aerial parts of Mentha x villosa (OEMV) were tested in rats using a combined in vivo and in vitro approach. In non-anesthetized normotensive rats, OEMV (1, 5, 10, 20, 30 mg kg(-1) body wt., i.v.) induced a significant and dose-dependent hypotension (-3 +/- 1.8%; -6 +/- 0.7%; -40 +/- 6.7%; -58 +/- 3.8%; -57 +/- 2.1%, respectively) associated with decreases in heart rate (-1 +/- 0.3%; -9 +/- 0.9%; -17 +/- 3.2%; -72 +/- 3.1%; -82 +/- 1.4%, respectively). The hypotensive and bradycardic responses evoked by OEMV were attenuated and blocke by pre-treatment of the animals with atropine (2 mg kg(-1) body wt., i.v.). In isolated rat atrial preparations, OEMV (10, 100, 300, 500 microg ml(-1)) produced concentration-related negative chronotropic and inotropic effects (IC50 value = 229 +/- 17 and 120 +/- 13 microg ml(-1), respectively). In isolated rat aortic rings, increasing concentrations of OEM (10, 100, 300, 500 microg ml(-1)) were able to antagonize the effects of phenylephrine (1 microM), prostaglandin F2alpha (10 microM) and KCl (80 mM)-induced contractions (IC50 value = 255 +/- 9, 174 +/- 4 and 165 +/- 14 microg ml(-1), respectively). The vasorelaxant activity induced by OEMV was attenuated significantly by either endothelium removal (IC50 value = 304 +/- 9 microg ml(-1)), NG-nitro L-arginine methyl ester (L-NAME) 100 microM (IC50 value=359 +/- 18 microg ml(-1)), L-NAME 300 microM (IC50 value = 488 +/- 20 microg ml(-1)) or indomethacin 10 microM (IC50 value = 334 +/- 18 microg ml(-1)). However, it was not affected by atropine 1 microM (IC50 value = 247 +/- 12 microg ml(-1)). Furthermore, the hypotensive response induced by OEMV was attenuated significantly after nitric oxide (NO) synthase blockade (L-NAME, 20 mg kg(-1) body wt., i.v.), while bradycardia was not altered. The results suggest that the hypotensive effect induced by OEMV is probably due to its direct cardiodepressant action and peripheral vasodilation, which can be attributed to both endothelium-dependent (via EDRFs, at least NO and prostacyclin) and endothelium-independent mechanisms (such as Ca2+ channel blockade).
Collapse
Affiliation(s)
- D Nunes Guedes
- Laboratório de Tecnologia Farmacêutica, Universidade Federal da Paraiba, Caixa Postal 5009, 58.051-970 João Pessoa, PB, Brazil
| | | | | | | |
Collapse
|
48
|
Ettarh RR, Emeka P. Morinda lucida extract induces endothelium-dependent and -independent relaxation of rat aorta. Fitoterapia 2004; 75:332-6. [PMID: 15158991 DOI: 10.1016/j.fitote.2004.02.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2003] [Accepted: 02/24/2004] [Indexed: 11/29/2022]
Abstract
The effect of an aqueous extract of Morinda lucida (ML) on vascular tone was tested using rat aortic rings precontracted with noradrenaline (10(-7) mol/l). Relaxation responses were determined with endothelium-intact, L-NAME-treated, methylene blue-treated and endothelium-denuded tissues. In the concentration range of 0.25-9.0 mg/ml, ML elicited vasorelaxation in noradrenaline-precontracted rings. This relaxation response was partially attenuated by removal of the endothelium, and completely inhibited by pretreatment of rings with L-NAME and methylene blue. Thus, ML-induced relaxation of vascular smooth muscle occurs via endothelium-dependent and -independent mechanisms, the former of which involves the nitric oxide-cGMP pathway.
Collapse
Affiliation(s)
- R R Ettarh
- Department of Physiology, College of Medicine, University of Lagos, Idi-Araba, PMB 12003 Lagos, Nigeria.
| | | |
Collapse
|
49
|
Maciel SS, Dias KLG, Medeiros IA. Calcium mobilization as the endothelium-independent mechanism of action involved in the vasorelaxant response induced by the aqueous fraction of the ethanol extract of Albizia inopinata G. P. Lewis (AFL) in the rat aorta. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2004; 11:130-134. [PMID: 15070162 DOI: 10.1078/0944-7113-00361] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In a previous work, we demonstrated that, in normotensive rats, AFL induced a marked hypotension due to a decrease in total peripheral resistances (TPR), partially secondary to the release of NO by the endothelium. NO did not, however, account for the total vasodilation produced by AFL in these rats. The aim of this study was to determine the involvement of the intracellular calcium mobilization in the vasorelaxant action induced by AFL in the rat aorta. In aorta of normotensive rats AFL (10, 20, 40 and 80 microg/ml) inhibited the sustained contractions induced by KCl (80 and 30 mM) and phenylephrine (Phe, 1 microM) with similar IC50 values (54 +/- 6, 52 +/- 4 and 65 +/- 4 microg/ml, respectively). The relaxing response induced by AFL against Phe-induced contractions was modified significantly by the endothelium removal (IC50 = 132 +/- 23 and 65 +/- 4 microg/ml, endothelium removed and intact endothelium aortic rings, respectively). Nevertheless, removal of the endothelium did not significantly change IC50 values when KCl (30 and 80 mM) was used as the contractile agent. The inhibitory effect induced by AFL on high (64.5 mM) K+-induced contraction was potentiated slightly (p < 0.05) by the decrease (from 2.5 to 0.3 mM, Ca2+) and attenuated by the increase (from 2.5 to 7.5 mM Ca2+) in the external [Ca2+]. In addition, in aortas from normotensive rats, AFL antagonized transient contractions induced in Ca2+-free media induced by 1 microM noradrenaline in a concentration-dependent manner, but not those induced by 20 mM caffeine. It is suggested that the remaining vasodilator effect of AFL in normotensive rats is probably due to an inhibition of Ca2+ influx and/or inhibition of intracellular Ca2+ mobilization from the noradrenaline-sensitive stores.
Collapse
Affiliation(s)
- S S Maciel
- Laboratório de Tecnologia Farmacêutica, Universidade Federal da Paraíba, João Pessoa, Brazil.
| | | | | |
Collapse
|
50
|
Saponara S, Kawase M, Shah A, Motohashi N, Molnar J, Ugocsai K, Sgaragli G, Fusi F. 3,5-Dibenzoyl-4-(3-phenoxyphenyl)-1,4-dihydro-2,6-dimethylpyridine (DP7) as a new multidrug resistance reverting agent devoid of effects on vascular smooth muscle contractility. Br J Pharmacol 2004; 141:415-22. [PMID: 14718255 PMCID: PMC1574217 DOI: 10.1038/sj.bjp.0705635] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The aim of this study was to investigate the effects of 3,5-diacetyl- (DP1-DP5) and 3,5-dibenzoyl-1,4-dihydropyridines (DP6-DP11) on vascular functions in vitro, by comparing their mechanical and electrophysiological actions in rat aorta rings and single rat tail artery myocytes, respectively, and to quantify their multidrug resistance (MDR)-reversing activity in L5178 Y mouse T-lymphoma cells transfected with MDR1 gene. In rat aorta, the 11 compounds tested, but 3,5-dibenzoyl-4-(3-phenoxyphenyl)-1,4-dihydro-2,6-dimethylpyridine (DP7), 3,5-dibenzoyl-4-(3-chlorophenyl)-1,4-dihydro-2,6-dimethylpyridine (DP9), 3,5-dibenzoyl-4-(4-chlorophenyl)-1,4-dihydro-2,6-dimethylpyridine (DP10) and 3,5-dibenzoyl-4-phenyl-1,4-dihydro-2,6-dimethylpyridine (DP11), antagonized 60 mm K+ (K60)-induced contraction in a concentration-dependent manner, with IC50 (m) values ranging between 5.65 x 10(-7) and 2.23 x 10(-5). The 11 dihydropyridines tested, but DP7, inhibited L-type Ca2+ current recorded in artery myocytes in a concentration-dependent manner, with IC50 (M) values ranging between 1.12 x 10(-6) and 6.90 x 10(-5). The K+ -channel opener cromakalim inhibited the Ca2+ -induced contraction in K30 but not that evoked in K60. On the contrary, DP7 was ineffective in both experimental conditions. When the rings were preincubated with 1 mm Ni2+ plus 1 microm nifedipine, the response to phenylephrine was significantly reduced by 2,5-di-t-butyl-1,4-benzohydroquinone (BHQ), a well-known endoplasmic reticulum Ca2+ -ATPase inhibitor. DP7 had no effects on this model system. In L5178 MDR cell line, the 11 dihydropyridines tested, but 3,5-diacetyl-4-(2-nitrophenyl)-1,4-dihydro-2,6-dimethylpyridine (DP1), 3,5-diacetyl-4-(3-phenoxyphenyl)-1,4-dihydro-2,6-dimethylpyridine (DP2) and 3,5-diacetyl-4-(3-chlorophenyl)-1,4-dihydro-2,6-dimethylpyridine (DP4), exhibited an MDR-reversing activity, with IC50 values ranging between 3.02 x 10(-7) and 4.27 x 10(-5), DP7 being the most potent. In conclusion, DP7 may represent a lead compound for the development of potent dihydropyridine MDR chemosensitizers devoid of vascular effects. British Journal of Pharmacology (2004) 141, 415-422. doi:10.1038/sj.bjp.0705635
Collapse
MESH Headings
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/physiology
- Cell Line, Tumor
- Dihydropyridines/chemistry
- Dihydropyridines/pharmacology
- Dose-Response Relationship, Drug
- Drug Resistance, Multiple/drug effects
- Drug Resistance, Multiple/physiology
- Leukemia L5178
- Mice
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Rats
- Vasoconstriction/drug effects
- Vasoconstriction/physiology
Collapse
Affiliation(s)
- Simona Saponara
- Istituto di Scienze Farmacologiche, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| | - Masami Kawase
- Faculty of Pharmaceutical Sciences, Josai University, Saitama 350-0295, Japan
| | - Anamik Shah
- Department of Chemistry, Saurashtra University, Rajkot-360 005, India
| | | | - Joseph Molnar
- Faculty of Medicine, Institute of Microbiology, Albert Szent-Györgyi Medical University Dom ter 10, Szeged H-6720, Hungary
| | - Katalin Ugocsai
- Faculty of Medicine, Institute of Microbiology, Albert Szent-Györgyi Medical University Dom ter 10, Szeged H-6720, Hungary
| | - Giampietro Sgaragli
- Istituto di Scienze Farmacologiche, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
- Author for correspondence:
| | - Fabio Fusi
- Istituto di Scienze Farmacologiche, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| |
Collapse
|