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The aim of this work is based on the hypothesis that some molecules may enhance tumor radiosensitivity by increasing tumor oxygenation (p02). Firstly, the effect of the combination of two treatments (xanthiinol nicotinate and hydrocortisone) was studied using TLT tumor bearing mice, using electron paramagnetic resonance oximetry (EPR). No result was observed. Secondly, the effect of prostaglandins (PGh and PGE 1) was also tested , using TLT tumor bearing mice. An increased p02 was observed for PGiz (the most powerful endogenous vasodilatator). Nevertheless, embolisms at the injection site were observed, requiring changing the administration route. For PGE 1, EPR data clearly demonstrated an increase PO². These results were confirmed by others studies using relaxometry. Together our results show the potential usefulness of the administration of PGE 1 before irradiation L'objectif de ce travail est basé sur l'hypothèse que certaines molécules peuvent améliorer la radiosensibilité tumorale via l'augmentation de l'oxygénation tumorale ( PO²i). Premièrement, l’effet d'une combinaison de deux traitements (xanthinol nicotinate et hydrocortisone) a été étudié sur des souris porteuses d'une tumeur TLT, par oxymétrie par résonance paramagnétique électronique (RPE). Les résultats obtenus ne furent pas concluants. Deuxièmement, l'effet de prostaglandines (PGli et PGE 1) a également été testé sur des souris porteuses de tumeurs TLT. Une augmentation de p02 a pu être observée pour la PGh (vasodilatateur endogène le plus puissant). Néanmoins des phénomènes d'embolie au site d'injection obligeraient de changer la voie d'administration. Pour la PGE 1, des études de RPE ont clairement démontré une nette augmentation de la p02.Ces résultats ont été confirmés par des études de relaxométrie au fluor 19. Ces résultats montrent la potentielle utilité de l'administration de la PGE 1 avant l'irradiation.
Xanthinol Niacinate --- Hydrocortisone --- Prostaglandin Antagonists --- Tumor Microenvironment
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Aspirin --- Prostaglandin Antagonists --- Platelet Aggregation --- Blood Platelets --- Thromboxane B2 --- pharmacology --- drug effects --- biosynthesis --- Blood platelets, drug effects. --- Platelet aggregation, drug effects. --- Prostaglandin inhibitors. --- Thromboxane b2 --- Pharmacodynamics. --- Biosynthesis.
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Generative organs, Female --- Prostaglandins --- Genital Diseases, Female --- Genitalia, Female --- Pregnancy --- Prostaglandin Antagonists --- Effect of drugs on --- Antagonists --- Therapeutic use --- drug therapy --- drug effects --- physiology
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Prostaglandins --- antagonists and inhibitors --- analysis --- biosynthesis --- Prostaglandin Antagonists. --- 577.171.3 --- Antagonists, Prostaglandin --- Inhibitors, Prostaglandin --- Prostaglandin Antagonist --- Prostaglandin Inhibitor --- Prostaglandin Inhibitors --- Antagonist, Prostaglandin --- Inhibitor, Prostaglandin --- analysis. --- biosynthesis. --- Chemical structure of hormones --- antagonists & inhibitors --- Prostaglandins. --- 577.171.3 Chemical structure of hormones --- Prostaglandin Antagonists --- Inflammation --- Prostanoids --- Mediators --- Prostaglandins - antagonists and inhibitors --- Prostaglandins - analysis --- Prostaglandins - biosynthesis
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