Explore the effect of LLY‐283 on the ototoxicity of auditory cells caused by cisplatin: A bioinformatic analysis based on RNA‐seq

BACKGROUND: Cisplatin is a commonly used chemotherapeutic drug in clinics, and long‐term application will lead to hearing impairment. LLY‐283, an inhibitor of PRMT5, has not been reported in deafness. Our study aimed to explore the mechanism of LLY‐283 in hearing impairment. MATERIALS AND METHODS: First, we performed RNA‐seq (cisplatin in the experimental group and DMSO in the control group) to obtain the biological processes mainly involved in differentially expressed genes (DEGs). CCK‐8 and LDH experiments were used to observe the effect of LLY‐283 on cisplatin‐induced auditory cell injury. ROS experiment was used to monitor the impact of LLY‐283 on oxidative damage of auditory cells. Effect of LLY‐283 on apoptosis of auditory cells detected by TUNEL experiment. PCR and Western blotting were used to detect the expression of genes and proteins related to auditory cell apoptosis in LLY‐283 cells. Meanwhile, we explored the effect of LLY‐283 on the expression of PRMT5 in cisplatin‐induced hearing impaired cells at RNA and protein levels. RESULTS: Biological process analysis showed that DEGs were mainly enriched in the apoptotic process involved in morphogenesis (‐Log(10) P = 3.71). CCK‐8 and LDH experiments confirmed that LLY‐283 could save cisplatin‐induced auditory cell injury. ROS experiments confirmed that LLY‐283 could rescue cisplatin‐induced oxidative damage to auditory cells. TUNEL experiments confirmed that LLY‐283 could protect cisplatin‐induced apoptosis of auditory cells. Meanwhile, LLY‐283 could inhibit the expression of PRMT5 in auditory cells induced by cisplatin. CONCLUSION: LLY‐283 can rescue cisplatin‐induced auditory cell apoptosis injury. LLY‐283 can inhibit the increase in PRMT5 expression induced by cisplatin.