Inner Ear Cell Regeneration via c-myc and Notch Modulation
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Solution Overview
Problem
Current methods for regenerating hair cells in the mammalian inner ear are limited, as transdifferentiation of supporting cells into hair cells diminishes the existing population, and overexpression of Atoh1 in aged ears or flat epithelium is not sufficient to induce hair cell regeneration, while genetic deafness often occurs before birth, making postnatal intervention challenging.
Innovation Solution
Increasing c-myc and Notch activity in inner ear cells promotes cell cycle reentry and proliferation, allowing for the regeneration of hair and supporting cells, which can be differentiated or transdifferentiated to restore hearing and vestibular function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transdifferentiation of supporting cells into hair cells is used to regenerate hair cells, then hair cell regeneration is achieved, but the existing supporting cell population is diminished which impairs inner ear function
Solution Approach 1:
The patent changes the biological state parameters of supporting cells by modulating c-myc and Notch pathway activity, inducing them to reenter the cell cycle and proliferate while maintaining their supporting cell identity and function, thereby avoiding the functional impairment caused by transdifferentiation
2Quantity of substance
If overexpression of Atoh1 is used to induce hair cell regeneration in aged ears or flat epithelium, then hair cell regeneration is attempted, but the method is not sufficient to induce hair cell regeneration in these conditions
Solution Approach 1:
The patent changes the regulatory parameters controlling cell proliferation by activating c-myc and Notch pathways, which overcomes the age-related and epithelium-state limitations that prevent Atoh1 from effectively inducing hair cell regeneration in aged ears or flat epithelium
3Quantity of substance
If cell cycle reentry is induced in adult inner ear cells, then proliferation and regeneration are achieved, but the cells must overcome permanent exit from cell cycle that occurs in mature mammalian inner ear
Solution Approach 1:
The patent uses c-myc and Notch pathway components as intermediary molecules to mediate the reentry of adult inner ear cells into the cell cycle, bypassing the permanent cell cycle exit that characterizes mature mammalian inner ear cells
Data Source
AI summary
Provided are methods and compositions for inducing cells of the inner ear (for example, cochlear and utricular hair cells) to reenter to cell cycle and to proliferate. More particularly, the invention relates to the use of agents that increase c-myc activity and/or Notch activity for inducing cell cycle reentry and proliferation of cochlear or utricular hair cells and/or cochlear or utricular supporting cells. The methods and compositions can be used to promote the proliferation of hair cells and/or supporting cells to treat a subject at risk of, or affected with, hearing loss or a subject at risk of, or affected with vestibular dysfunction.