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Comparative entry of carboplatin and sucrose in endolymph in the rat cochlea
G Laurell1, M Teixeira, O Sterkers
1Institut National de la Santé et de la Recherche Médicale U 251, Department of Physiology, Faculté Xavier Bichat, Université Paris, France.
Abstract:
The permeability of the perilymphatic-endolymphatic interface for carboplatin was determined after lateral cerebral ventricle infusion of radioactive carboplatin (cis-diamine[1,1-cyclobutane-1-14C-dicarboxylate]platinum) to rats. [14C]sucrose, a similar weight molecule was used for comparison of the kinetics in the inner ear fluids. 14C-radioactivity was measured in perilymph and endolymph. The rate of elimination of the tracers from perilymph was equivalent indicating no difference in transport across the blood-perilymph barrier. The transport from perilymph to endolymph was very restricted for both substances. The present study indicates that the ototoxic effect of carboplatin cannot be explained by a specific endolymphatic transport mechanism.