Inner ear target cells

Inner ear target cells refer to the specialized cellular populations within the cochlea and vestibular system, primarily including sensory hair cells, supporting cells, spiral ganglion neurons, and the stria vascularis. These cells are the primary focus of therapeutic interventions for hearing loss, tinnitus, and balance disorders. Hair cells are responsible for mechanotransduction, converting sound vibrations into electrical signals, while spiral ganglion neurons transmit these signals to the brain. Supporting cells provide structural and metabolic support and are currently being investigated as targets for regenerative medicine, such as transdifferentiation into new hair cells via gene therapy (e.g., ATOH1 delivery) or small molecule modulation (e.g., Notch inhibitors). The stria vascularis maintains the endocochlear potential necessary for hearing. Therapeutic challenges include the blood-labyrinth barrier, which restricts systemic drug delivery, and the delicate nature of the inner ear, which makes local delivery (e.g., intratympanic or intracochlear) technically demanding.

Other names

Cochlear target cellsVestibular target cellsSensory cells of the inner earAuditory target cells

Mechanisms include glucocorticoid receptor agonism to reduce inflammation, ATOH1 gene delivery to induce hair cell regeneration, Notch signaling inhibition to promote supporting cell transdifferentiation, and JNK inhibition to prevent apoptosis.