Redox regulation of tumor cell toxicity by flavones from Lethedon tannaensis.

2.50
Hdl Handle:
http://hdl.handle.net/10541/90174
Title:
Redox regulation of tumor cell toxicity by flavones from Lethedon tannaensis.
Authors:
Bensasson, René V; Jossang, Akino; Zahir, Abdellatif; Bodo, Bernard; Land, Edward J
Abstract:
The purpose of the present work has been to seek a correlation of potential predictive value, demonstrating redox control of cytotoxicity toward human nasopharynx carcinoma (KB) cells by seven 5-hydroxy-7-methoxyflavones, together with two glycoside derivatives, all extracted from Lethedon tannaensis. In this approach, redox control is characterized by a physicochemical parameter expressing quantitatively the relative electron-donating power of the flavones, this parameter being the second order rate constant, kdelta, for quenching of singlet oxygen O2 (1deltag). This rate constant kdelta is usually related to the ability of a given molecule D to donate an electron and, thus, with the reduction potential E of the couple (D*+/D). Our results show that the flavone toxicity is linearly correlated with ease of oxidation: the higher the rate constant of reaction with singlet oxygen, the easier the oxidation, the less positive or more negative the reduction potential ((D*+/D), the higher the cytotoxicity. The results suggest new screening strategies to identify and improve potential antitumor drugs.
Affiliation:
Laboratoires de Biophysique et de Photobiologie, Muséum National d'Histoire Naturelle, CNRS UMR 8696, IFR 63, INSERM U201, Paris, France. rvb@mnhn.fr
Citation:
Redox regulation of tumor cell toxicity by flavones from Lethedon tannaensis. 1999, 27 (1-2):95-9 Free Radic. Biol. Med.
Journal:
Free Radical Biology & Medicine
Issue Date:
Jul-1999
URI:
http://hdl.handle.net/10541/90174
DOI:
10.1016/S0891-5849(99)00039-8
PubMed ID:
10443925
Type:
Article
Language:
en
ISSN:
0891-5849
Appears in Collections:
All Paterson Institute for Cancer Research

Full metadata record

DC FieldValue Language
dc.contributor.authorBensasson, René Ven
dc.contributor.authorJossang, Akinoen
dc.contributor.authorZahir, Abdellatifen
dc.contributor.authorBodo, Bernarden
dc.contributor.authorLand, Edward Jen
dc.date.accessioned2010-01-20T16:03:25Z-
dc.date.available2010-01-20T16:03:25Z-
dc.date.issued1999-07-
dc.identifier.citationRedox regulation of tumor cell toxicity by flavones from Lethedon tannaensis. 1999, 27 (1-2):95-9 Free Radic. Biol. Med.en
dc.identifier.issn0891-5849-
dc.identifier.pmid10443925-
dc.identifier.doi10.1016/S0891-5849(99)00039-8-
dc.identifier.urihttp://hdl.handle.net/10541/90174-
dc.description.abstractThe purpose of the present work has been to seek a correlation of potential predictive value, demonstrating redox control of cytotoxicity toward human nasopharynx carcinoma (KB) cells by seven 5-hydroxy-7-methoxyflavones, together with two glycoside derivatives, all extracted from Lethedon tannaensis. In this approach, redox control is characterized by a physicochemical parameter expressing quantitatively the relative electron-donating power of the flavones, this parameter being the second order rate constant, kdelta, for quenching of singlet oxygen O2 (1deltag). This rate constant kdelta is usually related to the ability of a given molecule D to donate an electron and, thus, with the reduction potential E of the couple (D*+/D). Our results show that the flavone toxicity is linearly correlated with ease of oxidation: the higher the rate constant of reaction with singlet oxygen, the easier the oxidation, the less positive or more negative the reduction potential ((D*+/D), the higher the cytotoxicity. The results suggest new screening strategies to identify and improve potential antitumor drugs.en
dc.language.isoenen
dc.subjectCultured Tumour Cells-
dc.subject.meshAntineoplastic Agents, Phytogenic-
dc.subject.meshFlavonoids-
dc.subject.meshHumans-
dc.subject.meshMolecular Structure-
dc.subject.meshOxidation-Reduction-
dc.subject.meshPlants, Medicinal-
dc.subject.meshTumor Cells, Cultured-
dc.titleRedox regulation of tumor cell toxicity by flavones from Lethedon tannaensis.en
dc.typeArticleen
dc.contributor.departmentLaboratoires de Biophysique et de Photobiologie, Muséum National d'Histoire Naturelle, CNRS UMR 8696, IFR 63, INSERM U201, Paris, France. rvb@mnhn.fren
dc.identifier.journalFree Radical Biology & Medicineen

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