0000000000241696

AUTHOR

Edet M. Anam

showing 2 related works from this author

Chromone and phenanthrene alkaloids from Dennettia tripetala.

2002

Dennettine, a new 2,6-dimethoxychromone and three known phenanthrene alkaloids (uvariopsine, stephenanthrine and argentinine) in addition to the phenolic and known compound vanillin were isolated from the roots of Dennettia tripetala. Their structures were determined by physical and spectroscopical one dimensional (1D) and 2D-NMR analysis, including heteronuclear multiple bond correlation and nuclear Overhauser enhancement spectroscopy.

Magnetic Resonance SpectroscopyTertiary amineStereochemistryAnnonaceaePharmacognosyPlant RootsStephenanthrinechemistry.chemical_compoundAlkaloidsDrug DiscoveryOrganic chemistrySpectroscopyDennettia tripetalabiologyMolecular StructureVanillinUvariopsineGeneral ChemistryGeneral MedicineNuclear magnetic resonance spectroscopyPhenanthrenePhenanthrenesbiology.organism_classificationchemistryHeteronuclear moleculeAnnonaceaeChromonesChromoneChemicalpharmaceutical bulletin
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Effect of two phenanthrene alkaloids on angiotensin II-induced leukocyte-endothelial cell interactionsin vivo

2003

The present study has evaluated the effect of two phenanthrene alkaloids, uvariopsine and stephenanthrine, on angiotensin II (Ang-II)-induced leukocyte–endothelial cell interactions in vivo and the mechanisms involved in their activity. Intravital microscopy within the rat mesenteric microcirculation was used. A 60 min superfusion with 1 nM Ang-II induced a significant increase in the leukocyte–endothelial cell interactions that were completely inhibited by 1 μM uvariopsine cosuperfusion. A lower dose of 0.1 μM significantly reduced Ang-II-induced leukocyte adhesion by 75%. When Ang-II was cosuperfused with 1 and 0.1 μM stephenanthrine, Ang-II-induced leukocyte responses were significantly …

Pharmacologychemistry.chemical_classificationmedicine.medical_specialtyReactive oxygen speciesPlatelet-activating factorSuperoxideLeukocyte RollingPharmacologyN-Formylmethionine leucyl-phenylalanineAngiotensin IIEndothelial stem cellchemistry.chemical_compoundEndocrinologychemistryInternal medicinemedicineIntracellularBritish Journal of Pharmacology
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