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AbstractAbstract
[en] Chemical changes in DNA components during the photodynamic effect are responsible for Mutagenic and carcinogenic phenomena. Basically two competitive mechanisns involving respectively a charge transfer (type I) and singlet oxygen (type II) are implicated in reactions photo-sensitized by different agents (acridines, phenothiazines, porphyrins, flavins, psoralenes...). A study of the photosensitized oxidation of DNA itself was approached through characterization of the main final products in the case of purine nucleosides. Methyl-2 naphthoquinone - 1,4 (vitamin K3) displays a special photosensitization mechanism involving a cation radical type of intermediary
[fr]
Les modifications chimiques des constituants de l'ADN au cours de l'effet photodynamique sont responsables des phenomenes de mutagenese et cancerogenese. Fondamentalement, deux mecanismes competitifs qui font intervenir respectivement un transfert de charge (type I) et l'oxygene singulet (type II) sont impliques dans les reactions photosensibilisees par divers agents (acridines, phenothiazines, porphyrines, flavines, psoralenes...). La caracterisation des principaux produits finals au niveau des nucleosides puriniques a permis d'aborder l'etude de la photooxydation sensibilisee de l'ADN lui-meme. La methyl-2 naphtoquinone-1,4 (vitamine K3) presente un mecanisme de photosensibilisation particulier qui fait intervenir un intermediaire de type radical cationOriginal Title
Oxydation photosensibilisee de l'ADN et de ses constituants
Primary Subject
Source
Sep 1982; 175 p; These (3. Cycle).
Record Type
Miscellaneous
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Thesis/Dissertation
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