| Effect of isolated fractions of Harpagophytum procumbens D.C. (devil's claw) on COX-1, COX-2 activity and nitric oxide production on whole-blood assay. | |
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MedLine Citation:
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PMID: 20812280 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The present study evaluates the effect of isolated fractions of Harpagophytum procumbens (devil's claw) on cyclooxygenase (COX-1 and COX-2) activities and NO production using a whole blood assay. The activity of COX-1 was quantified as platelet thromboxane B(2) production in blood clotting and COX-2 as prostaglandin E(2) production in LPS-stimulated whole blood. Total NO(2) (-)/NO(3) (-) concentration was determined by Griess reaction in LPS stimulated blood. Assays were performed by incubation of isolated fractions obtained by flash chromatography monitored with HPLC, TLC and identified by (1)HNMR, containing different amounts of harpagoside with blood from healthy donors. Indomethacin and etoricoxib were the positive controls of COX-1 and COX-2 Inhibition. Data shows that fraction containing the highest concentration of harpagoside inhibited indistinctively COX-1 and COX-2 (37.2 and 29.5% respectively) activity and greatly inhibited NO production (66%). In contrast the fraction including iridoid pool increased COX-2 and did not alter NO and COX-1 activities. The fraction containing cinnamic acid was able to reduce only NO production (67%). Our results demonstrated that the harpagoside fraction is the main responsible for the effect of devils claw on these enzyme activities. However, other components from devil's claw crude extract could antagonize or increase the synthesis of inflammatory mediators. |
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Authors:
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Maria Cecilia Anauate; Luce Maria Torres; Suzana Beatriz Veríssimo de Mello |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Phytotherapy research : PTR Volume: 24 ISSN: 1099-1573 ISO Abbreviation: Phytother Res Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-09-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8904486 Medline TA: Phytother Res Country: England |
Other Details:
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Languages: eng Pagination: 1365-9 Citation Subset: IM |
Copyright Information:
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Copyright 2010 John Wiley & Sons, Ltd. |
Affiliation:
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Faculdade de Medicina da Universidade de São Paulo, Department of Internal Medicine, Rheumatology Division, São Paulo, Brazil. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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