SIRT3 regulates PFKFB3-mediated glycolysis to attenuate cisplatin-induced ototoxicity both in vivo and in vitro.

Abstract

Cochlear hair cell death is the primary cause of cisplatin-induced ototoxicity, currently lacking widely applicable clinical methods for effective prevention and treatment. In this study, an in vivo cisplatin-induced ototoxicity model was established by intraperitoneal injection of 12 mg/kg cisplatin. We found that ablation of SIRT3 exacerbates cisplatin-induced hearing loss and cochlear hair cell damage. An in vitro cisplatin-induced ototoxicity model was established using 5 µM cisplatin in cochlear explants and OC-1 cells. We found that the absence of SIRT3 impairs cochlear hair cell glycolytic metabolism, leading to excessive accumulation of ROS and significant reduction in MMP levels, thereby promoting apoptosis. In contrast, overexpression of SIRT3 in OC-1 cells promotes cochlear hair cell survival and reduces cochlear hair cell apoptosis. Inhibition of PFKFB3 reduces glycolytic metabolism in OC-1 cells, and the protective effect conferred by SIRT3 overexpression is lost. In summary, the protective effect of SIRT3 may be mediated by the regulation of PFKFB3-dependent glycolysis and the mitigation of cisplatin-induced excessive ROS accumulation.