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      Effect of flavonoids morin; quercetin and nicotinic acid on lipid metabolism of rats experimentally fed with triton

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          Abstract

          Atherosclerosis is a coronary disease where deposition of lipids in the arteries leads to problems of blood circulation. The present work evaluates the action of the flavonoids morin, quercetin and nicotinic acid isolated in association on lipid metabolism in hyperlipidemic rats. Blood serum levels cholesterol, cholesterol-HDL, and triacylglycerids have been analysed following the intraperitoneal administration of the flavonoid compounds dissolved in propyleneglycol by in doses of 5mg/kg body weight. Quercetin presented the largest percentual reduction of cholesterol. The best results for cholesterol-HDL have been obtained with-nicotinic acid alone while morin-nicotinic acid combination showed the best triacylglycerols results. Results showed that flavonoids could be beneficious in the treatment of coronary diseases.

          Translated abstract

          Aterosclerose é uma doença coronária onde a deposição de lipídeos nas artérias leva a problemas na circulação sangüínea. O presente trabalho avalia a ação dos flavonóides morina, quercetina e ácido nicotínico isoladamente e em associação no metabolismo lipídico em ratos hiperlipidêmicos. Foram analisados os níveis de colesterol, colesterol- HDL e triacilgliceróis no soro sangüíneo após administração, via intraperitoneal, dos compostos flavonoídicos dissolvidos em propileno glicol na dose de 5mg/kg de peso corporal. Quercetina mostrou o maior percentual de redução do colesterol. Para colesterol-HDL, os melhores resultados foram obtidos com ácido nicotínico isoladamente, enquanto a associação morina-ácido nicotínico mostrou os melhores resultados para triacilgliceróis. Os resultados mostraram que os flavonóides podem ser benéficos no tratamento de doença coronoriana.

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          Most cited references30

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          Hydroxyl radical scavenging activity of flavonoids

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            On the mechanism of antithrombotic action of flavonoids.

            Flavonols (quercetin and rutin) and flavanes (cyanidol and meciadonol) were studied for their effect on non-enzymatic lipid peroxidation, lipoxygenase and cyclo-oxygenase activities, binding to albumin and platelet membranes. These biochemical properties of four flavonoids were compared with respect to their antithrombotic action in vivo and their efficacy at influencing the platelet-endothelium interaction in vitro. All four flavonoids inhibited the ascorbate-stimulated formation of malondialdehyde by boiled rat liver microsomes (quercetin greater than rutin approximately cyanidol approximately meciadonol) and inhibited platelet lipoxygenase activity (quercetin greater than cyanidol greater than meciadonol greater than rutin) whereas only flavonols, but not flavanes, stimulated cyclo-oxygenase and were bound to platelet membranes. The same two flavonols dispersed platelet thrombi which were adhering to the rabbit aortic endothelium in vitro (EC50 for quercetin was 80 nM and for rutin 500 nM) and prevented platelets from aggregation over blood-superfused collagen strip in vivo (ED50 for quercetin was 5 nmol/kg and for rutin 33 nmol/kg i.v.). Cyanidol and meciadonol were not effective as anti-thrombotic agents. It is concluded that activated platelets adhering to vascular endothelium generate lipid peroxides and oxygen-free radicals which inhibit endothelial biosynthesis of prostacyclin and destroy endothelium-derived relaxing factor (EDRF). Flavonols are anti-thrombotic because they are selectively bound to mural platelet thrombi and owing to their free radical scavenging properties resuscitate biosynthesis and action of endothelial prostacyclin and EDRF. Thus, flavonols release the thrombolytic and vasoprotective endothelial mediators only in these vascular segments which are covered by a carpet of aggregating platelets.
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              Carbon tetrachloride hepatotoxicity.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                babt
                Brazilian Archives of Biology and Technology
                Braz. arch. biol. technol.
                Instituto de Tecnologia do Paraná - Tecpar (Curitiba )
                1678-4324
                September 2001
                : 44
                : 3
                : 263-267
                Affiliations
                [1 ] Universidade Federal de Viçosa Brazil
                [2 ] Universidade Federal de Ouro Preto Brazil
                [3 ] Universidade Federal de Viçosa Brazil
                [4 ] Universidade Federal de Minas Gerais Brazil
                Article
                S1516-89132001000300007
                10.1590/S1516-89132001000300007
                d7cc671b-1d9d-45bb-80f7-50bdfb018c6e

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-8913&lng=en
                Categories
                BIOLOGY

                General life sciences
                Morin,Quercetin,Nicotinic Acid,Lipid,Cholesterol,Cholesterol-HDL,Triacylglycerols,Rats,Hyperlipidemic

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