Generating high-fidelity cochlear organoids from human pluripotent stem cells

Area of Science:

• Otoacoustic emissions
• Stem cell biology
• Auditory neuroscience

Background:

• Mechanosensitive hair cells in the cochlea are crucial for hearing but are susceptible to damage.
• Studying human cochlear hair cells is challenging due to the scarcity of tissue samples.
• Organoids present a promising in vitro model for studying rare tissues like cochlear cells.

Purpose of the Study:

• To replicate key differentiation cues for cochlear hair cell specification in vitro.
• To develop a novel system for modeling the human auditory organ.
• To investigate the role of specific signaling pathways in cochlear development.

Main Methods:

• Utilized 3D cultures of human pluripotent stem cells.
• Manipulated Sonic Hedgehog and WNT signaling pathways at specific times.
• Analyzed gene expression and cellular morphology of developing otic progenitors.

Main Results:

• Timed modulation of Sonic Hedgehog and WNT signaling induced ventral gene expression in otic progenitors.
• Ventralized otic progenitors formed patterned epithelia containing hair cells.
• Generated hair cells exhibited morphology, marker expression, and functional properties resembling both outer and inner cochlear hair cells.

Conclusions:

• Early morphogenic cues are sufficient to drive cochlear induction.
• This study establishes an unprecedented system for modeling the human auditory organ in vitro.
• The developed system offers new possibilities for studying hearing loss and auditory organ development.