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Human & Experimental Toxicology
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Modulation of cisplatin chronotoxicity related to reduced glutathione in mice

NA Boughattas

Laboratoire 'Rythmes Biologiques et Chronothérapeutique' Hôpital Paul Brousse, 94800 Villejuif, France, Laboratoire de Pharmacologie, Faculté de Médecine, 5019 Monastir, Tunisie

XM Li

J. Filipski

Laboratoire de Biololgie Moléculaire, Institut J. Monod, Université Paris 7, Paris, France

G. Lemaigre

Laboratoire d'Anatomie Pathologique, Hôpital Antoine Bèclére, 92 Clamart, France

E. Filipski

Laboratoire 'Rythmes Biologiques et Chronothérapeutique' Hôpital Paul Brousse, 94800 Villejuif, France

K. Bouzouita

Laboratoire de Pharmacologie, Faculté de Médecine, 5019 Monastir, Tunisie

O. Belhadj

Laboratoire de Biochimie, Faculté des Sciences, 1002 Tunis, Tunisie

F. Lévi

Laboratoire 'Rythmes Biologiques et Chronothérapeutique' Hôpital Paul Brousse, 94800 Villejuif, France

Intracellular reduced glutathione (GSH) concentrations were measured according to the tissue sampling-time along the 24 h scale in male B6D2F1 mice. A significant circadian rhythm in GSH content was statistically validated in liver, jejunum, colon and bone-marrow (P≤0.02) but not in kidney. Tissue GSH concentration increased in the dark-activity span and decreased in the light-rest span of mice. The minimum and maximum of tissue GSH content corresponded respectively to the maximum and minimum of cisplatin (CDDP) toxicity. The role of GSH rhythms with regard to CDDP toxicity was investigated, using a specific inhibitor of GSH biosynth esis, buthionine sulfoximine (BSO). Its effects were assessed on both tissue GSH levels and CDDP toxicity at three circadian times. BSO resulted in a 10-fold decrease of the 24 h-mean GSH in kidney. However a moderate GSH decrease characterized liver (-23%) and jejunum (-30%). BSO pretreatment largely enhanced CDDP toxicity which varied according to a circadian rhythm. Although BSO partly and/or totally abolished the tissue GSH rhythms, it did not modify those in CDDP toxicity. We conclude that GSH have an important influence on CDDP toxicity but not in the circadian mechanism of such platinum chronotoxicity.

Key Words: circadian rhythm • cisplatin • reduced glutathione • buthionine sulfoximine • toxicity

Human & Experimental Toxicology, Vol. 15, No. 7, 563-572 (1996)
DOI: 10.1177/096032719601500703
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