

FOLLOWUS
Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA
Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear and Harvard Medical School, Boston, MA 02114, USA
Section on Omics and Translational Science of Hearing, Neurotology Branch, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
Department of Otorhinolaryngology, Yokosuka Kyosai Hospital, Kanagawa 238-8558, Japan
Department of Otolaryngology, Qilu Hospital of Shandong University, Jinan 250062, China
Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94304, USA
Wu Tsai Neurosciences Institute, Stanford University, Stanford, CA 94304, USA
*Konstantina M. Stankovic, kstankovic@stanford.edu
Received:07 July 2025,
Accepted:06 March 2026,
Published:2026-04
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Jeong M, Vattino LG, Djurisic M, Rose KP, Hyakusoku H, Spasic S, et al. Engineering of functional auditory neurons from human induced pluripotent stem cells. Mil Med Res. 2026;13(1):100008.
Jeong M, Vattino LG, Djurisic M, Rose KP, Hyakusoku H, Spasic S, et al. Engineering of functional auditory neurons from human induced pluripotent stem cells. Mil Med Res. 2026;13(1):100008. DOI: 10.1016/j.mmr.2026.100008.
Background:
2
Spiral ganglion neurons (SGNs) relay auditory sensory information from the cochlea to the brain. Their loss results in permanent hearing impairment in humans due to their limited regenerative capacity. Progress in hearing restoration has been constrained by the inaccessibility of human inner ear tissue and challenges in generating functionally mature human SGN-like neurons from stem cells
in vitro
.
Methods:
2
To generate human SGN-like neurons from human induced pluripotent stem cells (hiPSCs)
we recapitulated key signaling pathways involved in human inner ear development. On day (D) 11 of differentiation
nerve growth factor receptor-positive cells (precursors of pre-placodal ectoderm and neural crest) were isolated using magnetic sorting. From D18 to D25
cultures were treated with sonic hedgehogs to induce otic neural progenitors. Neuronal maturation was subsequently promoted by a cocktail of brain-derived neurotrophic factor
neurotrophin-3
and insulin-like growth factor-1
which supports SGN development. Cellular identity and functionality were assessed using single-cell RNA sequencing
immunocytochemistry
whole-cell patch-clamp electrophysiology
co-culture assays
and calcium ion (Ca
2+
) imaging.
Results:
2
hiPSC-derived SGN-like neurons exhibited morphological
molecular
electrophysiological
and functional characteristics of SGNs
in vivo
. Neurons acquired bipolar morphology and were wrapped by glial cells. Transcriptomic analysis revealed that SGN-like neurons were distinct from other neuronal lineages and showed similarity to type I and type Ⅱ SGNs based on expression of synaptic and intrinsic excitability-related genes. Electrophysiological recordings revealed progressive hyperpolarization of resting membrane potential and emer
gence of overshooting action potentials
consistent with neuronal maturation. In co-culture systems
human SGN-like neurons formed functional synaptic connections with mouse cochlear hair cells and cochlear nucleus neurons
evidenced by Ca
2+
transients and induction of the immediate early gene
c-Fos
.
Conclusions:
2
This study reports a robust and reproducible protocol for generating human SGN-like neurons from hiPSCs
providing a versatile platform for studying human auditory development
disease modeling
drug screening
and cell-based therapies for hearing restoration.
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