HEI-OC1 Cells

The HEI-OC1 cell line, derived from the cochlea of the transgenic Immortomouse, represents a versatile model for studying auditory cell biology, particularly in the context of ototoxicity and protective mechanisms. HEI-OC1 cells are conditionally immortalized and exhibit characteristics of both sensory and supporting cells of the organ of Corti. These cells express various cochlear hair cell markers, including prestin, myosin 7a, and calbindin. As an in vitro model, HEI-OC1 has been applied to investigate the cellular responses to ototoxic drugs, such as aminoglycosides and cisplatin, which are known to induce hearing loss through apoptosis, ROS accumulation, and mitochondrial dysfunction.

HEI-OC1 cells have demonstrated utility in exploring protective strategies against ototoxic damage. For instance, studies have shown that lysophosphatidic acid (LPA) can mitigate the cytotoxic effects of cisplatin by reducing apoptosis, excessive autophagy, and ROS accumulation. Additionally, the inhibition of ferroptosis, a type of iron-dependent cell death, has been found to protect HEI-OC1 cells from cisplatin-induced damage by preserving mitochondrial function. The application of glucocorticoids, such as dexamethasone, has also been observed to protect HEI-OC1 cells from endoplasmic reticulum stress-induced apoptosis by modulating the PERK-CHOP pathway. These findings support the role of HEI-OC1 cells as a valuable model for screening drugs for ototoxicity and investigating otoprotective interventions.