Related Experiment Video
Updated: May 10, 2026
Cochlear Surface Preparation in the Adult Mouse
Published on: November 6, 2019
Modulation of Mcl-1 expression reduces age-related cochlear degeneration
Wei Ping Yang1, Yang Xu, Wei Wei Guo
1Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, People's Republic of China.
Abstract:
Mcl-1 is an anti-apoptotic member of the Bcl-2 family that modulates apoptosis-related signaling pathways and promotes cell survival. We have previously demonstrated a reduction of Mcl-1 expression in aging cochleae. To investigate whether restoring Mcl-1 expression would reduce aging-related cochlear degeneration, we developed a rat model of Mcl-1 overexpression. A plasmid encoding human Mcl-1/enhanced green fluorescent protein was applied to the round window of the cochlea. This in vivo treatment transfected both the sensory and supporting cells of the cochlear sensory epithelium and enhanced Mcl-1 expression at both the mRNA and the protein level. The upregulation of Mcl-1 expression reduced the progression of age-related cochlear dysfunction and sensory cell death. Furthermore, the transfection of Mcl-1 exerted its protective effect by suppressing cochlear apoptosis at the mitochondrial level. This study demonstrates that the genetic modulation of Mcl-1 expression reduces the progression of age-related cochlear degeneration.
Insights
Restoring Mcl-1 expression in aging cochleae reduces degeneration and cell death. This genetic modulation protects against age-related hearing loss by inhibiting mitochondrial apoptosis.
Area of Science:
- Otolaryngology
- Molecular Biology
- Gerontology
Background:
- Mcl-1, an anti-apoptotic protein, is downregulated in aging cochleae.
- Aging cochlear degeneration involves apoptosis and dysfunction.
- Restoring Mcl-1 may counteract age-related cochlear decline.
Purpose of the Study:
- To investigate if Mcl-1 overexpression can prevent age-related cochlear degeneration.
- To establish a rat model for Mcl-1 overexpression in the cochlea.
- To elucidate the mechanism by which Mcl-1 impacts cochlear aging.
Main Methods:
- Developed a rat model using plasmid-based Mcl-1/eGFP gene delivery to the cochlea via the round window.
- Utilized in vivo transfection targeting cochlear sensory and supporting cells.
- Quantified Mcl-1 expression at both mRNA and protein levels post-transfection.
Main Results:
- Successful transfection led to enhanced Mcl-1 expression in cochlear cells.
- Upregulated Mcl-1 significantly reduced age-related cochlear dysfunction and sensory cell death.
- Mcl-1 overexpression suppressed mitochondrial apoptosis pathways.
Conclusions:
- Genetic modulation of Mcl-1 expression is a viable strategy to mitigate age-related cochlear degeneration.
- Restoring Mcl-1 levels offers a protective effect against age-related hearing dysfunction.
- Targeting Mcl-1 at the mitochondrial level presents a therapeutic avenue for cochlear aging.
