[fr] Objectif: Nous avons émis l'hypothèse que les glucocorticoïdes peuvent augmenter la radiosensibilité tumorale en augmentant l'oxygénation tumorale (p O 2) par inhibition de la respiration mitochondriale.
<br />
<br />Experimental Design: The effect of three glucocorticoids (hydrocortisone, dexamethasone, and prednisolone) on p O 2 was studied in murine TLT liver tumors and FSaII fibrosarcomas. Experimental Design: L'effet de trois glucocorticoïdes (hydrocortisone, la dexaméthasone, et prednisolone) sur p O 2 a été étudiée dans les tumeurs du foie de souris TLT et des fibrosarcomes FSaII. At the time of maximum p O 2 ( t max , 30 min after administration), perfusion, oxygen consumption, and radiation sensitivity were studied. Au moment de la p maximale (t max O 2, 30 min après l'administration), la consommation d'oxygène, perfusion, la sensibilité aux rayons et ont été étudiées. Local p O 2 measurements were done using electron paramagnetic resonance. Local p O 2 mesures ont été effectuées en utilisant la résonance paramagnétique électronique. The oxygen consumption rate of tumor cells after in vivo glucocorticoid administration was measured using high-frequency electron paramagnetic resonance. Le taux de consommation d'oxygène des cellules tumorales dans l'administration après glucocorticoïdes in vivo a été mesurée à l'aide d'électrons de haute fréquence de résonance paramagnétique. Tumor perfusion and permeability measurements were assessed by dynamic contrast-enhanced magnetic resonance imaging. perfusion tumorale et les mesures de perméabilité ont été évalués par la dynamique renforcée imagerie par résonance magnétique en contraste.
<br />
<br />Results: All glucocorticoids tested caused a rapid increase in p O 2 . Résultats: Tous les glucocorticoïdes testé a provoqué une augmentation rapide de la p O 2. At t max , tumor perfusion decreased, indicating that the increase in p O 2 was not caused by an increase in oxygen supply. A t max, perfusion tumorale a diminué, ce qui indique que l'augmentation de p O 2 n'a pas été causé par une augmentation de l'apport d'oxygène. Also at t max , global oxygen consumption decreased. Toujours à t max, la consommation d'oxygène global a diminué. When irradiation (25 Gy) was applied at t max , the tumor radiosensitivity was enhanced (regrowth delay increased by a factor of 1.7). Lorsque l'irradiation (25 Gy) a été appliqué à t max, la radiosensibilité tumorale a été renforcée (délai repousse augmenté par un facteur de 1,7).
<br />
<br />Conclusion: These results show the potential usefulness of the administration of glucocorticoids before irradiation. Conclusion: Ces résultats montrent l'utilité potentielle de l'administration de glucocorticoïdes avant irradiation. [en] Purpose: We hypothesized that glucocorticoids may enhance tumor radiosensitivity by increasing tumor oxygenation (pO2) through inhibition of mitochondrial respiration.
<br />
<br />Experimental Design: The effect of three glucocorticoids (hydrocortisone, dexamethasone, and prednisolone) on pO2 was studied in murine TLT liver tumors and FSaII fibrosarcomas. At the time of maximum pO2 (tmax, 30 min after administration), perfusion, oxygen consumption, and radiation sensitivity were studied. Local pO2 measurements were done using electron paramagnetic resonance. The oxygen consumption rate of tumor cells after in vivo glucocorticoid administration was measured using high-frequency electron paramagnetic resonance. Tumor perfusion and permeability measurements were assessed by dynamic contrast-enhanced magnetic resonance imaging.
<br />
<br />Results: All glucocorticoids tested caused a rapid increase in pO2. At tmax, tumor perfusion decreased, indicating that the increase in pO2 was not caused by an increase in oxygen supply. Also at tmax, global oxygen consumption decreased. When irradiation (25 Gy) was applied at tmax, the tumor radiosensitivity was enhanced (regrowth delay increased by a factor of 1.7).
<br />
<br />Conclusion: These results show the potential usefulness of the administration of glucocorticoids before irradiation.
Disciplines :
Radiology, nuclear medicine & imaging Oncology
Author, co-author :
Crokart, Nathalie
JORDAN, Bénédicte
BAUDELET, Christine
CRON, Gregory
HOTTON, Julie
RADERMACHER, Kim
GREGOIRE, Vincent
BEGHIN, Nelson
MARTINIVE, Philippe ; Centre Hospitalier Universitaire de Liège - CHU > Radiothérapie
BOUZIN, Caroline
FERON, Olivier
GALLEZ, Bernard
Language :
English
Title :
Glucocorticoids Modulate Tumor Radiation Response through a Decrease in Tumor Oxygen Consumption
Alternative titles :
[fr] Les glucocorticoïdes modulent tumeur rayonnement Réponse à travers une diminution de la consommation d'oxygène des tumeurs
Publication date :
2007
Journal title :
Clinical Cancer Research
ISSN :
1078-0432
eISSN :
1557-3265
Publisher :
American Association for Cancer Research, Inc. (AACR), Birmingham, United States - Alabama
Volume :
15
Issue :
13
Pages :
630/5
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Les subventions: Fonds national belge de la Recherche Scientifique (FNRS), le Télévie, Fonds Joseph Maisin, et «Actions de Recherches Concertées-Communauté Française de Belgique-ARC 04/09-317.
The costs of publication of this article were defrayed in part by the payment of page charges. Les frais de publication de cet article ont été pris en charge en partie par le paiement des frais de publication. This article must therefore be hereby marked advertisement in accordance with 18 USC Section 1734 solely to indicate this fact. Cet article doit donc être présente annonce marqués conformément à la loi 18 USC Section 1734 uniquement pour indiquer ce fait.
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