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Passos CCO, Bezerra LL, da Rocha MN, Alves DR, Marinho MM, Marinho ES, de Morais SM. Studies of the Croton nepetaefolius Bail. essential oil and constituents as anticholinesterase agents against Alzheimer’s disease. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02611-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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2
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Alves-Silva JM, Zuzarte M, Girão H, Salgueiro L. The Role of Essential Oils and Their Main Compounds in the Management of Cardiovascular Disease Risk Factors. Molecules 2021; 26:molecules26123506. [PMID: 34207498 PMCID: PMC8227493 DOI: 10.3390/molecules26123506] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/01/2021] [Accepted: 06/02/2021] [Indexed: 12/28/2022] Open
Abstract
Cardiovascular diseases (CVDs) are a global health burden that greatly impact patient quality of life and account for a huge number of deaths worldwide. Despite current therapies, several side effects have been reported that compromise patient adherence; thus, affecting therapeutic benefits. In this context, plant metabolites, namely volatile extracts and compounds, have emerged as promising therapeutic agents. Indeed, these compounds, in addition to having beneficial bioactivities, are generally more amenable and present less side effects, allowing better patient tolerance. The present review is an updated compilation of the studies carried out in the last 20 years on the beneficial potential of essential oils, and their compounds, against major risk factors of CVDs. Overall, these metabolites show beneficial potential through a direct effect on these risk factors, namely hypertension, dyslipidemia and diabetes, or by acting on related targets, or exerting general cellular protection. In general, monoterpenic compounds are the most studied regarding hypotensive and anti-dyslipidemic/antidiabetic properties, whereas phenylpropanoids are very effective at avoiding platelet aggregation. Despite the number of studies performed, clinical trials are sparse and several aspects related to essential oil’s features, namely volatility and chemical variability, need to be considered in order to guarantee their efficacy in a clinical setting.
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Affiliation(s)
- Jorge M. Alves-Silva
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research, Faculty of Medicine, 3000-548 Coimbra, Portugal; (J.M.A.-S.); (M.Z.); (H.G.)
- Univ Coimbra, Faculty of Pharmacy, 3000-548 Coimbra, Portugal
- Univ Coimbra, Center for Innovative Biomedicine and Biotechnology, 3000-548 Coimbra, Portugal
- Clinical Academic Centre of Coimbra, 3000-548 Coimbra, Portugal
| | - Mónica Zuzarte
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research, Faculty of Medicine, 3000-548 Coimbra, Portugal; (J.M.A.-S.); (M.Z.); (H.G.)
- Univ Coimbra, Center for Innovative Biomedicine and Biotechnology, 3000-548 Coimbra, Portugal
- Clinical Academic Centre of Coimbra, 3000-548 Coimbra, Portugal
| | - Henrique Girão
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research, Faculty of Medicine, 3000-548 Coimbra, Portugal; (J.M.A.-S.); (M.Z.); (H.G.)
- Univ Coimbra, Center for Innovative Biomedicine and Biotechnology, 3000-548 Coimbra, Portugal
- Clinical Academic Centre of Coimbra, 3000-548 Coimbra, Portugal
| | - Lígia Salgueiro
- Univ Coimbra, Faculty of Pharmacy, 3000-548 Coimbra, Portugal
- Univ Coimbra, Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, 3030-790 Coimbra, Portugal
- Correspondence:
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Micucci M, Bolchi C, Budriesi R, Cevenini M, Maroni L, Capozza S, Chiarini A, Pallavicini M, Angeletti A. Antihypertensive phytocomplexes of proven efficacy and well-established use: Mode of action and individual characterization of the active constituents. PHYTOCHEMISTRY 2020; 170:112222. [PMID: 31810054 DOI: 10.1016/j.phytochem.2019.112222] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 11/23/2019] [Accepted: 11/24/2019] [Indexed: 06/10/2023]
Abstract
Hypertension has become the leading risk factor for worldwide cardiovascular diseases. Conventional pharmacological treatment, after both dietary and lifestyle changes, is generally proposed. In this review, we present the antihypertensive properties of phytocomplexes from thirteen plants, long ago widely employed in ethnomedicines and, in recent years, increasingly evaluated for their activity in vitro and in vivo, also in humans, in comparison with synthetic drugs acting on the same systems. Here, we focus on the demonstrated or proposed mechanisms of action of such phytocomplexes and of their constituents proven to exert cardiovascular effects. Almost seventy phytochemicals are described and scientifically sound pertinent literature, published up to now, is summarized. The review emphasizes the therapeutic potential of these natural substances in the treatment of the 'high normal blood pressure' or 'stage 1 hypertension', so-named according to the most recent European and U.S. guidelines, and as a supplementation in more advanced stages of hypertension, however needing further validation by clinical trial intensification.
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Affiliation(s)
- M Micucci
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum University of Bologna, Via Belmeloro, 6, 40126, Italy
| | - C Bolchi
- Department of Pharmaceutical Sciences, University of Milano, Via Mangiagalli 25, 20133, Milan, Italy
| | - R Budriesi
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum University of Bologna, Via Belmeloro, 6, 40126, Italy
| | - M Cevenini
- Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna, Via Massarenti 9, 40126, Bologna, Italy
| | - L Maroni
- Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna, Via Massarenti 9, 40126, Bologna, Italy
| | - S Capozza
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum University of Bologna, Via Belmeloro, 6, 40126, Italy
| | - A Chiarini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum University of Bologna, Via Belmeloro, 6, 40126, Italy
| | - M Pallavicini
- Department of Pharmaceutical Sciences, University of Milano, Via Mangiagalli 25, 20133, Milan, Italy.
| | - A Angeletti
- Unit of Nephrology, Dialysis and Transplantation, Department of Experimental Diagnostic and Specialty Medicine, University of Bologna, S.Orsola Malpighi Hospital, Bologna Italy
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Alves-Silva JM, Zuzarte M, Marques C, Girão H, Salgueiro L. Protective Effects of Phenylpropanoids and Phenylpropanoid-rich Essential Oils on the Cardiovascular System. Mini Rev Med Chem 2019; 19:1459-1471. [PMID: 31218957 DOI: 10.2174/1389557519666190620091915] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 05/31/2019] [Accepted: 06/06/2019] [Indexed: 12/23/2022]
Abstract
BACKGROUND Cardiovascular diseases are the leading cause of global mortality with a tendency to increase due to population ageing as well as an increase in associated risk factors. Although current therapies improve survival rates, they are associated with several side effects, thus justifying the development of novel preventive and/or therapeutic approaches. In this way, plant metabolites such as essential oils have emerged as promising agents due to their biological effects. OBJECTIVE Bearing in mind that several essential oils are characterized by high amounts of phenylpropanoids, which may play a crucial role in the activity of these volatile extracts, a comprehensive and systematic review focusing on the cardiovascular effects of phenylpropanoid-rich essential oils is presented. METHODS Popular search engines including PubMed, Science Direct, Scopus and Google Scholar were consulted and papers from 2000 onwards were selected. Non-volatile phenylpropanoids were not considered in this review. RESULTS A compilation of the current knowledge on this thematic pointed out beneficial effects for volatile phenylpropanoids namely hypotensive, vasorelaxant, antiplatelet aggregation, antidyslipidaemic and antidiabetic, as well as protective properties against ischemia/reperfusion injury and heart hypertrophy. CONCLUSION A better understanding of the protective effects of phenylpropanoids on the cardiovascular system is presented, thus paving the way towards future research on plant-based therapies for cardiovascular diseases.
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Affiliation(s)
- Jorge M Alves-Silva
- iCBR, Faculty of Medicine, University of Coimbra, Azinhaga de Sta Comba, Coimbra, Portugal.,CIEPQPF and Faculty of Pharmacy, University of Coimbra, Azinhaga de Sta Comba, Coimbra, Portugal
| | - Mónica Zuzarte
- iCBR, Faculty of Medicine, University of Coimbra, Azinhaga de Sta Comba, Coimbra, Portugal
| | - Carla Marques
- iCBR, Faculty of Medicine, University of Coimbra, Azinhaga de Sta Comba, Coimbra, Portugal
| | - Henrique Girão
- iCBR, Faculty of Medicine, University of Coimbra, Azinhaga de Sta Comba, Coimbra, Portugal
| | - Lígia Salgueiro
- CIEPQPF and Faculty of Pharmacy, University of Coimbra, Azinhaga de Sta Comba, Coimbra, Portugal
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da Silva R, de Morais L, Silva A, Bastos C, Pereira-Gonçalves Á, Kerntopf M, Menezes I, Leal-Cardoso J, Barbosa R. Vasorelaxant effect of the Lippia alba essential oil and its major constituent, citral, on the contractility of isolated rat aorta. Biomed Pharmacother 2018; 108:792-798. [DOI: 10.1016/j.biopha.2018.09.073] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 08/31/2018] [Accepted: 09/12/2018] [Indexed: 10/28/2022] Open
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6
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Gas Chromatography-Triple Quadrupole Mass Spectrometry Analysis and Vasorelaxant Effect of Essential Oil from Protium heptaphyllum (Aubl.) March. BIOMED RESEARCH INTERNATIONAL 2017; 2017:1928171. [PMID: 28951867 PMCID: PMC5603114 DOI: 10.1155/2017/1928171] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 07/26/2017] [Indexed: 01/06/2023]
Abstract
The Protium heptaphyllum species, also known as Almécega, produces an oily resin, used in folk medicine as an analgesic and anti-inflammatory agent, in healing, and as an expectorant, which is rich in pentacyclic triterpenes and essential oils. In this study, the essential oil obtained by hydrodistillation of Almécega's resin was analyzed by gas chromatography-triple quadrupole mass spectrometry and evaluated for chemical composition and vasorelaxant activity in rat superior mesenteric artery. The main constituents determined by gas chromatography-triple quadrupole mass spectrometry were limonene, p-cineole, and o-cymene. In intact rings precontracted with phenylephrine (Phe 1 μM), EOPh (3–750 μg/mL) induced relaxation, and the essential oil had a concentration-dependent vasorelaxant effect, without involvement of endothelial mediators.
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Božović M, Ragno R. Calamintha nepeta (L.) Savi and its Main Essential Oil Constituent Pulegone: Biological Activities and Chemistry. Molecules 2017; 22:E290. [PMID: 28216606 PMCID: PMC6155702 DOI: 10.3390/molecules22020290] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 02/06/2017] [Indexed: 11/17/2022] Open
Abstract
Medicinal plants play an important role in the treatment of a wide range of diseases, even if their chemical constituents are not always completely recognized. Observations on their use and efficacy significantly contribute to the disclosure of their therapeutic properties. Calamintha nepeta (L.) Savi is an aromatic herb with a mint-oregano flavor, used in the Mediterranean areas as a traditional medicine. It has an extensive range of biological activities, including antimicrobial, antioxidant and anti-inflammatory, as well as anti-ulcer and insecticidal properties. This study aims to review the scientific findings and research reported to date on Calamintha nepeta (L.) Savi that prove many of the remarkable various biological actions, effects and some uses of this species as a source of bioactive natural compounds. On the other hand, pulegone, the major chemical constituent of Calamintha nepeta (L.) Savi essential oil, has been reported to exhibit numerous bioactivities in cells and animals. Thus, this integrated overview also surveys and interprets the present knowledge of chemistry and analysis of this oxygenated monoterpene, as well as its beneficial bioactivities. Areas for future research are suggested.
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Affiliation(s)
- Mijat Božović
- Rome Center for Molecular Design, Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Rino Ragno
- Rome Center for Molecular Design, Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
- Alchemical Dynamics s.r.l., 00125 Rome, Italy.
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Cardiovascular Effects of the Essential Oil of Croton argyrophylloides in Normotensive Rats: Role of the Autonomic Nervous System. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 2016:4106502. [PMID: 27956919 PMCID: PMC5124457 DOI: 10.1155/2016/4106502] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 10/25/2016] [Indexed: 11/30/2022]
Abstract
Cardiovascular effects of the essential oil of Croton argyrophylloides Muell. Arg. (EOCA) were investigated in normotensive rats. In saline-pretreated anesthetized or conscious rats, intravenous (i.v.) injection of the EOCA induced dose-dependent hypotension. Dose-dependent tachycardia was observed only in conscious rats. In anesthetized rats, cervical bivagotomy failed to enhance EOCA-induced hypotension but unmasked significant bradycardia. In conscious rats, i.v. pretreatment with methylatropine, but not with atenolol or L-NAME, reduced both hypotensive and tachycardiac responses to EOCA. However, hexamethonium pretreatment reverted the EOCA-induced tachycardia into significant bradycardia without affecting the hypotension. In aortic ring preparations precontracted with phenylephrine, EOCA induced a concentration-dependent relaxation that was significantly reduced by vascular endothelium removal and pretreatment with atropine, indomethacin, or glibenclamide but remained unaffected by pretreatment with L-NAME or TEA. It is concluded that i.v. treatment with EOAC decreased blood pressure probably through an active vascular relaxation rather than withdrawal of sympathetic tone. Muscarinic receptor stimulation, liberation of the endothelium-derived prostacyclin, and opening KATP channels are partially involved in the aortic relaxation induced by EOCA and in turn in the mediation of EOCA-induced hypotension. EOCA-induced tachycardia in conscious rats appears to be mediated reflexly through inhibition of vagal drive to the heart.
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Generalić Mekinić I, Blažević I, Mudnić I, Burčul F, Grga M, Skroza D, Jerčić I, Ljubenkov I, Boban M, Miloš M, Katalinić V. Sea fennel ( Crithmum maritimum L.): phytochemical profile, antioxidative, cholinesterase inhibitory and vasodilatory activity. Journal of Food Science and Technology 2016; 53:3104-3112. [PMID: 27765981 DOI: 10.1007/s13197-016-2283-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 05/12/2016] [Accepted: 06/29/2016] [Indexed: 10/21/2022]
Abstract
Sea fennel, a rediscovered star of the coastal cuisine, has been investigated for its phytochemical profile and biological potential. Sea fennel flowers, stems and leaves were analyzed for essential oils (EOs) isolated by hydrodistillation, as well as non-volatiles obtained by ethanolic extraction. Limonene were found to be a dominant compound in EOs and ethanolic extracts; ranging from 57.5-74.2 % and 0.7-8.1 mg/g dry plant material, respectively. In addition total phenolic content was determined for ethanolic extracts. All samples and their main phytochemicals were tested for various methods. EO and extract obtained from flowers were tested for vasodilatory activity on rat aortic rings. Antioxidant activity of EOs was extremely low in comparison to extracts, on the contrary to cholinesterase inhibition where EOs showed better activity than extracts. Flower extract and chlorogenic acid showed stronger vasodilators in comparison to EO and limonene. The obtained results point out the potential impact of the dominant compounds from EO and extract on the biological properties of the sea fennel.
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Affiliation(s)
- Ivana Generalić Mekinić
- Department of Food Technology and Biotechnology, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
| | - Ivica Blažević
- Department of Organic Chemistry, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
| | - Ivana Mudnić
- Department of Pharmacology, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
| | - Franko Burčul
- Department of Biochemistry, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
| | - Mia Grga
- Department of Food Technology and Biotechnology, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
| | - Danijela Skroza
- Department of Food Technology and Biotechnology, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
| | - Iva Jerčić
- Department of Pharmacology, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
| | - Ivica Ljubenkov
- Department of Chemistry, Faculty of Science, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia
| | - Mladen Boban
- Department of Pharmacology, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
| | - Mladen Miloš
- Department of Biochemistry, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
| | - Višnja Katalinić
- Department of Food Technology and Biotechnology, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
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Vasconcelos-Silva AA, Lima FJBD, Brito TSD, Lahlou S, Magalhães PJC. Vasorelaxation induced by methyl cinnamate, the major constituent of the essential oil of Ocimum micranthum, in rat isolated aorta. Clin Exp Pharmacol Physiol 2015; 41:755-62. [PMID: 25115734 DOI: 10.1111/1440-1681.12289] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 07/15/2014] [Accepted: 07/17/2014] [Indexed: 11/29/2022]
Abstract
The aim of the present study was to investigate the vascular effects of the E-isomer of methyl cinnamate (E-MC) in rat isolated aortic rings and the putative mechanisms underlying these effects. At 1-3000 μmol/L, E-MC concentration-dependently relaxed endothelium-intact aortic preparations that had been precontracted with phenylephrine (PHE; 1 μmol/L), with an IC50 value (geometric mean) of 877.6 μmol/L (95% confidence interval (CI) 784.1-982.2 μmol/L). These vasorelaxant effects of E-MC remained unchanged after removal of the vascular endothelium (IC50 725.5 μmol/L; 95% CI 546.4-963.6 μmol/L) and pretreatment with 100 μmol/L N(G) -nitro-l-arginine methyl ester (IC50 749.0 μmol/L; 95% CI 557.8-1005.7 μmol/L) or 10 μmol/L 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (IC50 837.2 μmol/L; 95% CI 511.4-1370.5 μmol/L). Over the concentration range 1-3000 μmol/L, E-MC relaxed K(+) -induced contractions in mesenteric artery preparations (IC50 314.5 μmol/L; 95% CI 141.9-697.0 μmol/L) with greater potency than in aortic preparations (IC50 1144.7 μmol/L; 95% CI 823.2-1591.9 μmol/L). In the presence of a saturating contractile concentration of K(+) (150 mmol/L) in Ca(2+) -containing medium combined with 3 μmol/L PHE, 1000 μmol/L E-MC only partially reversed the contractile response. In contrast, under similar conditions, E-MC nearly fully relaxed PHE-induced contractions in aortic rings in a Ba(2+) -containing medium. In preparations that were maintained under Ca(2+) -free conditions, 600 and 1000 μmol/L E-MC significantly reduced the contractions induced by exogenous Ca(2+) or Ba(2+) in KCl-precontracted preparations, but not in PHE-precontracted preparations (in the presence of 1 μmol/L verapamil). In addition, E-MC (1-3000 μmol/L) concentration-dependently relaxed the contractions induced by 2 mmol/L sodium orthovanadate. Based on these observations, E-MC-induced endothelium-independent vasorelaxant effects appear to be preferentially mediated by inhibition of plasmalemmal Ca(2+) influx through voltage-dependent Ca(2+) channels. However, the involvement of a myogenic mechanism in the effects of E-MC is also possible.
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11
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Zhu K, Yang SN, Ma FF, Gu XF, Zhu YC, Zhu YZ. The novel analogue of hirsutine as an anti-hypertension and vasodilatary agent both in vitro and in vivo. PLoS One 2015; 10:e0119477. [PMID: 25909998 PMCID: PMC4409389 DOI: 10.1371/journal.pone.0119477] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 01/13/2015] [Indexed: 11/19/2022] Open
Abstract
In this paper, an analogue of hirsutine (compound 1) has been synthesized and evaluated as an anti-hypertension agent, which exhibits extraordinary effects on the contractile response of thoracic aorta rings from male SD rats in vitro (IC50 = 1.129×10(-9)±0.5025) and the abilities of reducing the systolic blood pressure (SBP) and heart rate (HR) of SHR in vivo. The mechanism investigation reveals that the vasodilatation induced by compound 1 is mediated by both endothelium-dependent and -independent manners. The relaxation in endothelium-intact aortic rings induced by compound 1 can be inhibited by L-NAME (1×10(-6) mol•L(-1)) and ODQ (1×10(-6) mol•L(-1)). Moreover, compound 1 can also block Ca2+ influx through L-type Ca2+ channels and inhibit intracellular Ca2+ release while no effect on K+ channel has been observed. All these data demonstrated that the NO/cyclic GMP pathway can be involved in endothelium-dependent manner induced by compound 1. Meanwhile the mechanism on the vasodilatation of compound 1 probably also related to blockade of Ca2+ influx through L-type Ca2+ channels and inhibition of intracellular Ca2+ release may have no relationship with K+ channels.
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Affiliation(s)
- Kai Zhu
- Department of Pharmacology, School of Pharmacy and Institute of Biomedical Sciences, Fudan University, Shanghai, 201203, China
| | - Su-Na Yang
- Department of Pharmacology, School of Pharmacy and Institute of Biomedical Sciences, Fudan University, Shanghai, 201203, China
| | - Fen-Fen Ma
- Department of Pharmacology, School of Pharmacy and Institute of Biomedical Sciences, Fudan University, Shanghai, 201203, China
| | - Xian-Feng Gu
- Department of Medicinal Chemistry, School of Pharmacy and Institute Biomedical Sciences, Fudan University, Shanghai, 201203, China
| | - Yi-Chun Zhu
- Departments of Physiology and Pathophysiology, Shanghai College of Medicine, Fudan University, Shanghai, 201203, China
| | - Yi-Zhun Zhu
- Department of Pharmacology, School of Pharmacy and Institute of Biomedical Sciences, Fudan University, Shanghai, 201203, China
- Department of Pharmacology, National University of Singapore, Singapore, Singapore
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12
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Ding J, Huang C, Peng Z, Xie Y, Deng S, Nie YZ, Xu TL, Ge WH, Li WG, Li F. Electrophysiological characterization of methyleugenol: a novel agonist of GABA(A) receptors. ACS Chem Neurosci 2014; 5:803-11. [PMID: 24980777 DOI: 10.1021/cn500022e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Methyleugenol (ME) is a natural constituent isolated from many plant essential oils having multiple biological effects including anticonvulsant and anesthetic activities, although the underlying mechanisms remain unclear. Here, we identify ME as a novel agonist of ionotropic γ-aminobutyric acid (GABA) receptors. At lower concentrations (∼30 μM), ME significantly sensitized GABA-induced, but not glutamate- or glycine-induced, currents in cultured hippocampal neurons, indicative of a preferentially modulatory role of this compound for A type GABA receptors (GABAARs). In addition, ME at higher concentrations (≥100 μM) induced a concentration-dependent, Cl(-)-permeable current in hippocampal neurons, which was inhibited by a GABAAR channel blocker, picrotoxin, and a competitive GABAAR antagonist, bicuculline, but not a specific glycine receptor inhibitor, strychnine. Moreover, ME activated a similar current mediated by recombinant α1-β2-γ2 or α5-β2-γ2 GABAARs in human embryonic kidney (HEK) cells. Consequently, ME produced a strong inhibition of synaptically driven neuronal excitation in hippocampal neurons. Together, these results suggest that ME represents a novel agonist of GABAARs, shedding additional light on future development of new therapeutics targeting GABAARs. The present study also adds GABAAR activation to the list of molecular targets of ME that probably account for its biological activities.
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Affiliation(s)
- Jing Ding
- Department
of Developmental and Behavioral Pediatrics, Shanghai Institute of
Pediatric Translational Medicine, Shanghai Children’s Medical
Center, Ministry of Education-Shanghai Key Laboratory of Children’s
Environmental Health, Shanghai Jiao Tong University School of Medicine, Shanghai 200129, China
- Department
of Chinese Materia Medica, College of Pharmaceutical Science, Zhejiang Chinese Medical University, Hangzhou 310053, China
- Neuroscience
Division, Departments of Anatomy, Histology and Embryology, Biochemistry,
and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment
and Inflammation, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Chen Huang
- Neuroscience
Division, Departments of Anatomy, Histology and Embryology, Biochemistry,
and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment
and Inflammation, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Zhong Peng
- Neuroscience
Division, Departments of Anatomy, Histology and Embryology, Biochemistry,
and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment
and Inflammation, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Yuxuan Xie
- Department
of Developmental and Behavioral Pediatrics, Shanghai Institute of
Pediatric Translational Medicine, Shanghai Children’s Medical
Center, Ministry of Education-Shanghai Key Laboratory of Children’s
Environmental Health, Shanghai Jiao Tong University School of Medicine, Shanghai 200129, China
| | - Shining Deng
- Department
of Developmental and Behavioral Pediatrics, Shanghai Institute of
Pediatric Translational Medicine, Shanghai Children’s Medical
Center, Ministry of Education-Shanghai Key Laboratory of Children’s
Environmental Health, Shanghai Jiao Tong University School of Medicine, Shanghai 200129, China
| | - Yan-Zhen Nie
- Department
of Developmental and Behavioral Pediatrics, Shanghai Institute of
Pediatric Translational Medicine, Shanghai Children’s Medical
Center, Ministry of Education-Shanghai Key Laboratory of Children’s
Environmental Health, Shanghai Jiao Tong University School of Medicine, Shanghai 200129, China
| | - Tian-Le Xu
- Neuroscience
Division, Departments of Anatomy, Histology and Embryology, Biochemistry,
and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment
and Inflammation, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Wei-Hong Ge
- Department
of Chinese Materia Medica, College of Pharmaceutical Science, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Wei-Guang Li
- Department
of Developmental and Behavioral Pediatrics, Shanghai Institute of
Pediatric Translational Medicine, Shanghai Children’s Medical
Center, Ministry of Education-Shanghai Key Laboratory of Children’s
Environmental Health, Shanghai Jiao Tong University School of Medicine, Shanghai 200129, China
- Neuroscience
Division, Departments of Anatomy, Histology and Embryology, Biochemistry,
and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment
and Inflammation, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Fei Li
- Department
of Developmental and Behavioral Pediatrics, Shanghai Institute of
Pediatric Translational Medicine, Shanghai Children’s Medical
Center, Ministry of Education-Shanghai Key Laboratory of Children’s
Environmental Health, Shanghai Jiao Tong University School of Medicine, Shanghai 200129, China
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Maia-Joca RPM, Joca HC, Ribeiro FJP, do Nascimento RV, Silva-Alves KS, Cruz JS, Coelho-de-Souza AN, Leal-Cardoso JH. Investigation of terpinen-4-ol effects on vascular smooth muscle relaxation. Life Sci 2014; 115:52-8. [PMID: 25219882 DOI: 10.1016/j.lfs.2014.08.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2014] [Revised: 08/13/2014] [Accepted: 08/21/2014] [Indexed: 10/24/2022]
Abstract
AIMS This study investigated the mechanisms underlying the vascular effects of terpinen-4-ol in isolated rat aortic ring preparations. MAIN METHODS The thoracic aortae of healthy rats were submitted to isometric tension recording. Membrane resting potential and input membrane resistance were measured by conventional microelectrode technique. KEY FINDINGS Terpinen-4-ol reversibly relaxed endothelium-containing preparations pre-contracted with high K(+) and phenylephrine with IC50 values of 421.43 μM and 802.50 μM, respectively. These effects were significantly reduced by vascular endothelium removal. In Ca(2+)-free and high K(+) (80 mM) medium, the contractions produced by Ba(2+) were reduced by terpinen-4-ol (100-1000 μM) in a concentration-dependent manner. In aortic rings maintained under Ca(2+)-free conditions, terpinen-4-ol significantly reduced the contractions induced by either phenylephrine (1 μM) or phorbol 12,13-dibutyrate (1 μM). Terpinen-4-ol (10-1000 μM) also relaxed the contractions evoked by BAYK-8644 (3 μM) with an IC50 of 454.23 μM. Neither membrane resting potential nor input resistance of smooth muscle cells was altered by terpinen-4-ol exposure. SIGNIFICANCE The present results suggest that terpinen-4-ol induced vascular smooth muscle relaxation that was preferentially due to the inhibition of electromechanical pathways related to calcium influx through voltage-operated calcium channels.
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Affiliation(s)
| | - Humberto Cavalcante Joca
- Department of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | | | | | | | - Jader S Cruz
- Department of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
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Arruda-Barbosa L, Rodrigues KMS, Souza-Neto FDCV, Duarte GP, Borges RS, Magalhães PJC, Lahlou S. Vasorelaxant effects of 1-nitro-2-phenylethene in rat isolated aortic rings. Vascul Pharmacol 2014; 63:55-62. [PMID: 25131395 DOI: 10.1016/j.vph.2014.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 07/27/2014] [Accepted: 08/01/2014] [Indexed: 11/28/2022]
Abstract
Previously, we showed that nitro-2-phenylethane is a vasorelaxant constituent of the essential oil of Aniba canelilla. Here, we investigated the mechanisms underlying the vascular effects of 1-nitro-2-phenylethene (NPe), a structural analog of 1-nitro-2-phenylethane obtained synthetically, in rat isolated thoracic aortic preparations. At 0.1-100 μg/mL, NPe similarly relaxed endothelium-intact or endothelium-denuded aortic preparations pre-contracted with 60mM KCl or with phenylephrine (PHE, 1 μM). Vasorelaxant effects of NPe against PHE-induced contractions remained unaffected following blockade of potassium channels by TEA, and inhibition of either nitric oxide synthase by l-NAME, cyclooxygenase by indomethacin or guanylate cyclase by ODQ. In preparations maintained under Ca(2+)-free conditions, NPe significantly reduced the contractions induced (i) by PHE, but not those evoked by caffeine, (ii) by CaCl2 in either PHE (in the presence of 1 μM verapamil)- or KCl-stimulated preparations, (iii) by extracellular Ca(2+) restoration in thapsigargin-treated aortic preparations, and (iv) by the activator of protein kinase C phorbol-12,13-dibutyrate or the inhibitor of protein tyrosine phosphatase sodium orthovanadate. It is concluded that NPe induced an endothelium-independent vasorelaxation with potency greater than its structural analog 1-nitro-2-phenylethane. Such action appears to occur intracellularly probably through inhibition of contractile events that are clearly independent of Ca(2+) influx from the extracellular milieu.
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Affiliation(s)
| | | | | | - Gloria Pinto Duarte
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, PE, Brazil.
| | | | | | - Saad Lahlou
- Department of Physiology and Pharmacology, Federal University of Ceará, CE, Brazil.
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15
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16
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Vasodilator compounds derived from plants and their mechanisms of action. Molecules 2013; 18:5814-57. [PMID: 23685938 PMCID: PMC6270466 DOI: 10.3390/molecules18055814] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 04/24/2013] [Accepted: 05/07/2013] [Indexed: 12/31/2022] Open
Abstract
The present paper reviews vasodilator compounds isolated from plants that were reported in the past 22 years (1990 to 2012) and the different mechanisms of action involved in their vasodilator effects. The search for reports was conducted in a comprehensive manner, intending to encompass those metabolites with a vasodilator effect whose mechanism of action involved both vascular endothelium and arterial smooth muscle. The results obtained from our bibliographic search showed that over half of the isolated compounds have a mechanism of action involving the endothelium. Most of these bioactive metabolites cause vasodilation either by activating the nitric oxide/cGMP pathway or by blocking voltage-dependent calcium channels. Moreover, it was found that many compounds induced vasodilation by more than one mechanism. This review confirms that secondary metabolites, which include a significant group of compounds with extensive chemical diversity, are a valuable source of new pharmaceuticals useful for the treatment and prevention of cardiovascular diseases.
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da Cunha GH, de Moraes MO, Fechine FV, Frota Bezerra FA, Silveira ER, Canuto KM, de Moraes MEA. Vasorelaxant and antihypertensive effects of methanolic fraction of the essential oil of Alpinia zerumbet. Vascul Pharmacol 2013; 58:337-45. [PMID: 23603277 DOI: 10.1016/j.vph.2013.04.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 03/19/2013] [Accepted: 04/09/2013] [Indexed: 01/06/2023]
Abstract
Alpinia zerumbet is used in folk medicine in Brazil to treat hypertension. However, several pathways involved in the mechanism of vasorelaxation are still unclear. This study was designed to verify the antihypertensive effect of the methanolic fraction of the essential oil of A. zerumbet (MFEOAz) and to characterize its mechanism of action. The thoracic aortic rings from the Wistar rats were perfused in the organ chambers filled with Kreb's solution, where the tension of each ring was measured. The antihypertensive effect of MFEOAz was assessed in rats submitted to chronic hypertension by inhibition of nitric oxide synthesis by indirect measurement of blood pressure with indirect tail cuff method. MFEOAz relaxed phenylephrine and KCl-induced contraction of either endothelium-intact or endothelium-denuded rat aortic rings in a concentration-dependent manner. Pre-incubation with MFEOAz (100 and 300 μg/mL) in Ca(2+)-free Krebs solution attenuated phenylephrine- or caffeine-induced contraction. Pre-incubation with L-NAME, ODQ, wortmannin, atropine, indomethacin, catalase, SOD, TEA, 4-aminopyridine, glibenclamide, apamin, charybdotoxin, or iberiotoxin did not affect MFEOAz-induced relaxation. The intragastric administration of MFEOAz induced an antihypertensive effect. MFEOAz it seems inhibited the calcium influx via voltage-operated calcium channels and receptor-operated calcium channels, as well as inhibition of calcium mobilization from intracellular stores.
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Affiliation(s)
- Gilmara Holanda da Cunha
- Clinical Pharmacology Unit, Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Coronel Nunes de Melo 1127, 60430-270, Fortaleza, Ceará, Brazil.
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de França-Neto A, Cardoso-Teixeira AC, Medeiros TC, do Socorro Quinto-Farias M, de Souza Sampaio CM, Coelho-de-Souza AN, Lahlou S, Leal-Cardoso JH. Essential Oil of Croton Argyrophylloides: Toxicological Aspects and Vasorelaxant Activity in Rats. Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200701040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Croton argyrophylloides Muell. Arg. is widely used in Brazilian folk medicine to treat diabetes and venereal diseases. This study examined the acute toxicity and cytotoxicity of the essential oil of C. argyrophylloides(EOCA). In addition, vascular effects of the EOCA have been examined. In mice, an oral acute toxicity test revealed that EOCA could be considered as a non toxic essential oil since it showed a very high LD50 (9.84 ± 0.01 g/kg). In the brine shrimp ( Artemia salina) cytotoxic assay, the LC50 value of EOCA was 275 [165-534] μg/mL. EOCA (1-1000 μg/mL) relaxed isolated endothelium-intact aortic rings precontracted with phenylephrine with an IC50 value of 126.7 [89.8-163.7] μg/mL. In rat mesenteric bed preparations precontracted with phenylephrine, EOCA (1-300 μg/mL) also induced a reversible, vasodilator effect with an IC50 value of 46.0 [33.3-58.7] μg/mL. It is concluded that EOCA is a very interesting agent from the point of view of the possibility of therapeutic application. This is because, whilst showing a very small acute toxicity, EOCA also showed maximal efficacy as a vascular antispasmodic agent with a pharmacological potency similar to that of other Croton species essential oils.
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Affiliation(s)
- Aldair de França-Neto
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
| | - Ana Carolina Cardoso-Teixeira
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
| | - Thiago Coutinho Medeiros
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
| | - Maria do Socorro Quinto-Farias
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
| | - Celia Maria de Souza Sampaio
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
| | - Andrelina Noronha Coelho-de-Souza
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
| | - Saad Lahlou
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
- Department of Physiology and Pharmacology, Federal University of Ceará, Rua Coronel Nunes de Melo, 1127, Rodolfo Teófilo, 60430-270, Fortaleza, CE, Brazil
| | - José Henrique Leal-Cardoso
- Superior Institute of Biomedical Sciences, State University of Ceará, Avenida Paranjana, 1700, Campus de Itaperi, 60740-903, Fortaleza, CE, Brazil
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Barata LES, dos Santos BCB, Marques FA, Baroni ACM, de Oliveira PR, Einloft P, Ribeiro JCL, Guerrero PG. Seasonal Variation of the Volatile Constituents from Leaves ofPimenta pseudocaryophyllus(Gomes). JOURNAL OF ESSENTIAL OIL RESEARCH 2011. [DOI: 10.1080/10412905.2011.9700469] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Wang KT, Chen LG, Chou DS, Liang WL, Wang CC. Anti-Oxidative Abilities of Essential Oils from Atractylodes ovata Rhizome. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2011; 2011:204892. [PMID: 21799672 PMCID: PMC3135905 DOI: 10.1093/ecam/neq006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Accepted: 01/01/2010] [Indexed: 11/13/2022]
Abstract
The rhizome of Atractylodes ovata De Candolle is rich in essential oils, which are usually removed by processing. In this study, anti-oxidative abilities of essential oils and aqueous extracts of A. ovata rhizome were explored, and the influence of processing on the anti-oxidative abilities was examined. Essential oils and aqueous extracts of A. ovata were extracted by boiling water and steam distillation, respectively. Quality of these two A. ovata samples was controlled by HPLC and GC-MS system, and anti-oxidative abilities were then evaluated. Results showed that surface color of A. ovata turned to brown and chemical components were changed by processing. Contents of both atractylon and atractylenolide II decreased in the essential oils, but only the contents of atractylon decreased by processing. Atractylenolide III increased in both A. ovata samples. However, A. ovata essential oils displayed stronger anti-oxidative abilities than aqueous extracts in DPPH-scavenging, TBH-induced lipid peroxidation and catalase activity assays. Moreover, the bioactivity of essential oils from raw A. ovata was stronger than oils from processed A. ovata. On the other hand, cytotoxicity of A. ovata essential oils was stronger than that of aqueous extracts, and was more sensitive on H9C2 cell than NIH-3T3 and WI-38 cells. In contrast, stir-frying processing method increased cytotoxicity of essential oils, but the cytotoxicity was ameliorated when processed with assistant substances. The results suggested that phytochemical components and bioactivity of A. ovata were changed after processing and the essential oils from raw A. ovata showed better anti-oxidative and fewer cytotoxicity effects.
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Affiliation(s)
- Kun-Teng Wang
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110, Taiwan
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Leonhardt V, Leal-Cardoso JH, Lahlou S, Albuquerque AAC, Porto RS, Celedônio NR, Oliveira AC, Pereira RF, Silva LP, Garcia-Teófilo TMN, Silva APFS, Magalhães PJC, Duarte GP, Coelho-de-Souza AN. Antispasmodic effects of essential oil of Pterodon polygalaeflorus and its main constituent β-caryophyllene on rat isolated ileum. Fundam Clin Pharmacol 2011; 24:749-58. [PMID: 20015227 DOI: 10.1111/j.1472-8206.2009.00800.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study investigates the effects of essential oil of Pterodon polygalaeflorus (EOPP) and β-caryophyllene (β-CAR). EOPP and β-CAR relaxed the basal tone of ileum smooth muscle in a concentration-dependent manner (IC(50) s = 394.35 ± 62.12 and 68.65 ± 9.51 μg/mL respectively), an effect that was unaltered by hexamethonium, L-nitroarginine methyl ester or indomethacin. Both EOPP and β-CAR evoked a concentration-dependent relaxation of ileum pre-contracted with KCl with an IC(50) value of 107.78 ± 10.47 and 17.35 ± 0.75 μg/mL, respectively. EOPP and β-CAR inhibited the contractions induced by acetylcholine (ACh) and by KCl. In ileal preparations, the CaCl(2) -induced contractions were reduced by EOPP (300 μg/mL) and β-CAR (100 μg/mL). Furthermore, CaCl(2) -induced contractions were also reduced by EOPP (300 μg/mL) and β-CAR (100 μg/mL) in ileal preparations pretreated with ACh under Ca(2+) -free condition and in the presence of verapamil. EOPP (100 and 300 μg/mL) and β-CAR (30 and 100 μg/mL) reduced the ACh-induced contractions of isolated rat ileum under Ca(2+) -free conditions. In the presence of high KCl and Ca(2+) -free conditions, EOPP (300 μg/mL) and β-CAR (100 μg/mL) reduced the contractions induced by barium. A similar effect was also observed with verapamil. It is concluded that (i) β-CAR is an important constituent involved in the myorelaxant and antispasmodic effects induced by EOPP; (ii) the inhibitory effect on intestinal contractility is myogenic and seems mainly mediated through an intracellular mechanism. However, the ability of EOPP and β-CAR to decrease Ca(2+) influx through cytoplasmic membrane could not be discounted.
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Affiliation(s)
- Valeria Leonhardt
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
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Lima FC, Peixoto-Neves D, Gomes MDM, Coelho-de-Souza AN, Lima CC, Araújo Zin W, Magalhães PJC, Saad L, Leal-Cardoso JH. Antispasmodic effects of eugenol on rat airway smooth muscle. Fundam Clin Pharmacol 2010; 25:690-9. [DOI: 10.1111/j.1472-8206.2010.00892.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Leal-Cardoso JH, Lahlou S, Weinreich D, Caldas Magalhães PJ. The essential oil of Croton nepetaefolius selectively blocks histamine-augmented neuronal excitability in guinea-pig celiac ganglion. J Pharm Pharmacol 2010; 62:1045-53. [PMID: 20663039 DOI: 10.1111/j.2042-7158.2010.01121.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Croton nepetaefolius is a medicinal plant useful against intestinal disorders. In this study, we elucidate the effects of its essential oil (EOCN) on sympathetic neurons, with emphasis on the interaction of EOCN- and histamine-induced effects. METHODS The effects of EOCN and histamine were studied in guinea-pig celiac ganglion in vitro. KEY FINDINGS Histamine significantly altered the resting potential (E(m)) and the input resistance (R(i)) of phasic neurons (from -56.6 +/- 1.78 mV and 88.6 +/- 11.43 MOmega, to -52.9 +/- 1.96 mV and 108.6 +/- 11.00 MOmega, respectively). E(m), R(i) and the histamine-induced alterations of these parameters were not affected by 200 microg/ml EOCN. The number of action potentials produced by a 1-s (two-times threshold) depolarising current and the current threshold (I(th)) for eliciting action potentials (rheobase) were evaluated. Number of action potentials and I(th) were altered by histamine (from 2.6 +/- 0.43 action potentials and 105.4 +/- 11.15 pA to 6.2 +/- 1.16 action potentials and 67.3 +/- 8.21 pA, respectively). EOCN alone did not affect number of action potentials and I(th) but it fully blocked the histamine-induced modifications of number of action potentials and I(th). All the effects produced by histamine were abolished by pyrilamine. CONCLUSIONS EOCN selectively blocked histamine-induced modulation of active membrane properties.
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Bastos VPD, Brito TS, Lima FJB, Pinho JPM, Lahlou S, Abreu Matos FJ, Santos AA, Caldas Magalhães PJ. Inhibitory effect of 1,8-cineole on guinea-pig airway challenged with ovalbumin involves a preferential action on electromechanical coupling. Clin Exp Pharmacol Physiol 2009; 36:1120-6. [PMID: 19413601 DOI: 10.1111/j.1440-1681.2009.05189.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
1. 1,8-Cineole is a terpenoid constituent of essential oils with anti-inflammatory properties. It reduces the neural excitability, functions as an antinociceptive agent and has myorelaxant actions in guinea-pig airways. The aim of the present study was to investigate the mechanism underlying the myorelaxant effects of 1,8-cineole in guinea-pig isolated trachea from either naïve guinea-pigs or ovalbumin (OVA)-sensitized animals subjected to antigenic challenge. 2. Isometric recordings were made of the tone of isolated tracheal rings. Rings with an intact epithelium relaxed beyond basal tone in the presence of 1,8-cineole (6.5 x 10(-6) to 2 x 10(-2) mol/L) in a concentration-dependent manner (P < 0.001, anova) with a pD(2) value of 2.23 (95% confidence interval 2.10-2.37). Removal of the epithelium or pretreatment of intact tissue for 15 min with 50 micromol/L N(G)-nitro-l-arginine methyl ester, 5 mmol/L tetraethylammonium, 0.5 micromol/L tetrodotoxin or 5 micromol/L propranolol did not alter the potency (pD(2)) or the maximal myorelaxant effect (E(max)) of 1,8-cineole. 3. 1,8-Cineole also significantly decreased the Schultz-Dale contraction induced by OVA, mainly in preparations from OVA-sensitized animals submitted to antigen challenge. 1,8-Cineole decreased tracheal hyperresponsiveness to KCl and carbachol caused by antigen challenge and almost abolished the concentration-response curves to KCl, whereas it had little effect on the concentration-response curves to carbachol. Under Ca(2+)-free conditions and in the presence of 10(-4) mol/L acetylcholine, neither 1,8-cineole (6.5 x 10(-3) mol/L) nor verapamil (1 x 10(-5) mol/L) affected Ca(2+)-induced contractions, but they almost abolished Ba(2+)-induced contractions. 4. In conclusion, the findings of the present study show that 1,8-cineole is a tracheal myorelaxant that acts preferentially on contractile responses elicited electromechanically.
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Affiliation(s)
- Vasco P D Bastos
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
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