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Metformin Protects Auditory Hair Cells from Gentamicin-Induced Toxicity in vitro
Andrea Glutz1, Katharina Leitmeyer, Cristian Setz
1Department of Biomedicine, Head and Neck Surgery, University Hospital Basel, Basel, Switzerland.
Abstract:
Metformin is a commonly used antidiabetic drug. It has been shown that this drug activates the AMP-activated protein kinase, which inhibits downstream the mammalian target of rapamycin. In addition, several studies indicate that metformin reduces intracellular reactive oxygen species. Our data, using an in vitro rat model, indicate that metformin is able to protect auditory hair cells (HCs) from gentamicin-induced apoptotic cell death. Moreover, metformin has no toxic effect on spiral ganglion neuronal survival or outgrowth in vitro. These results suggest a protective effect of metformin on auditory HC survival in gentamicin-induced HC loss in vitro.
Insights
Metformin, an antidiabetic drug, protects auditory hair cells from damage in a laboratory setting. This research suggests metformin may safeguard hearing by preventing hair cell death caused by certain toxins.
Area of Science:
- Oto-pharmacology
- Cell Biology
- Neuroscience
Background:
- Metformin is a widely prescribed antidiabetic medication.
- Metformin activates AMP-activated protein kinase, inhibiting the mammalian target of rapamycin pathway.
- Studies suggest metformin reduces intracellular reactive oxygen species.
Purpose of the Study:
- To investigate the potential protective effects of metformin on auditory hair cells (HCs) in vitro.
- To assess the impact of metformin on gentamicin-induced HC apoptosis.
- To evaluate the safety of metformin on spiral ganglion neuronal survival.
Main Methods:
- Utilized an in vitro rat model.
- Exposed auditory hair cells to gentamicin in the presence and absence of metformin.
- Assessed hair cell survival and spiral ganglion neuron outgrowth.
Main Results:
- Metformin demonstrated a protective effect against gentamicin-induced apoptotic cell death in auditory hair cells.
- Metformin did not exhibit toxic effects on spiral ganglion neuronal survival or outgrowth in vitro.
- The drug appears to mitigate damage to sensory hair cells.
Conclusions:
- Metformin shows promise as a protective agent for auditory hair cells against specific types of ototoxicity.
- These findings suggest a potential therapeutic role for metformin in preventing or treating hearing loss associated with hair cell damage.
- Further research is warranted to explore metformin's efficacy in vivo.
