Three-Dimensional Otic Neuronal Progenitor Spheroids Derived from Human Embryonic Stem Cells

Area of Science:

• Regenerative Medicine
• Neuroscience
• Otolaryngology

Background:

• Sensorineural hearing loss (SNHL) is a significant challenge, with stem cell-based therapies offering potential for spiral ganglion neuron (SGN) regeneration.
• Current transplantation methods for SGN regeneration require further optimization for cell differentiation and survival.
• Human embryonic stem cell (hESC)-derived otic neuronal progenitor (ONP) cells are a promising cell source for SNHL treatment.

Purpose of the Study:

• To investigate the potential of hESC-derived ONP cell spheroids for enhanced SNHL therapy.
• To optimize the 3D culture conditions and transplantation timing for ONP spheroids.
• To establish a feasible transplantation protocol for ONP spheroids into the inner ear.

Main Methods:

• Generation of hESC-derived ONP spheroids using 3D culture.
• Characterization of spheroid molecular and functional properties.
• Assessment of optimal spheroid transplantation time point (7 days in vitro).
• Development of a micropipette-based transplantation protocol using a digital microinjection system.

Main Results:

• ONP spheroids retained molecular and functional characteristics of ONP cells, upstream in the SGN lineage.
• Optimal transplantation timing was identified at 7 days of in vitro 3D culture.
• A feasible micropipette-based transplantation protocol for ONP spheroids was successfully developed.
• Spheroid form demonstrated potential for improved cell survival and function in vivo.

Conclusions:

• hESC-derived ONP spheroids are a viable and optimized form for stem cell replacement therapy in SNHL.
• A 7-day 3D culture period followed by micropipette transplantation is an effective method.
• This approach provides a promising strategy for regenerating SGNs and restoring hearing.