Kinesin spindle protein inhibitor exacerbates cisplatin-induced hair cell damage

Area of Science:

• Ototoxicity research
• Molecular mechanisms of hearing loss
• Cancer therapeutics side effects

Background:

• Kinesin family proteins are crucial for axonal growth and tumor progression.
• The role of Kinesin spindle protein (KSP) in auditory organs is largely unexplored.
• Cisplatin is a common chemotherapy agent with known ototoxic side effects.

Purpose of the Study:

• To investigate the role of Kinesin spindle protein (KSP) in the auditory system.
• To determine the effect of KSP inhibition on cisplatin-induced ototoxicity.
• To explore KSP as a potential therapeutic target for reducing hearing damage.

Main Methods:

• Utilized mouse organ of Corti explants and HEI-OC1 cell line.
• Administered SB743921, a KSP inhibitor, with and without cisplatin.
• Assessed cell viability and toxicity using CCK-8 and LDH assays.
• Evaluated apoptosis and superoxide generation.
• Investigated the protective effects of N-acetylcysteine (NAC).

Main Results:

• SB743921 pretreatment sensitized HEI-OC1 cells to cisplatin ototoxicity.
• KSP inhibition promoted cisplatin-induced apoptosis and exacerbated superoxide generation.
• SB743921 enhanced cisplatin-induced hair cell damage in cochlear explants.
• NAC treatment rescued cisplatin-induced hair cell loss, confirming SB743921's role in superoxide accumulation.

Conclusions:

• Inhibition of Kinesin spindle protein (KSP) increases hair cell susceptibility to cisplatin-induced ototoxicity.
• KSP inhibition exacerbates cisplatin-induced damage through apoptosis and oxidative stress.
• KSP inhibition represents a potential therapeutic target for mitigating platinum-based drug ototoxicity.