Role of the copper transporter, CTR1, in platinum-induced ototoxicity.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Swati S MoreKathleen M Giacomini

Abstract

The goal of this study was to determine the role of an influx copper transporter, CTR1, in the ototoxicity induced by cisplatin, a potent anticancer platinum analog used in the treatment of a variety of solid tumors. As determined through reverse transcriptase-PCR (RT-PCR), quantitative RT-PCR, Western blot, and immunohistochemistry, mouse CTR1 (Ctr1) was found to be abundantly expressed and highly localized at the primary sites of cisplatin toxicity in the inner ear, mainly outer hair cells (OHCs), inner hair cells, stria vascularis, spiral ganglia, and surrounding nerves in the mouse cochlea. A CTR1 substrate, copper sulfate, decreased the uptake and cytotoxicity of cisplatin in HEI-OC1, a cell line that expresses many molecular markers reminiscent of OHCs. Small interfering RNA-mediated knockdown of Ctr1 in this cell line caused a corresponding decrease in cisplatin uptake. In mice, intratympanic administration of copper sulfate 30 min before intraperitoneal administration of cisplatin was found to prevent hearing loss at click stimulus and 8, 16, and 32 kHz frequencies. To date, the utility of cisplatin remains severely limited because of its ototoxic effects. The studies described in this report suggest that cisplatin-indu...Continue Reading

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