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Attenuation of aminoglycoside ototoxicity by glutathione
1Department of Otolaryngology, WFAC Hiroshima General Hospital, Japan.
Abstract:
Aminoglycoside antibiotics are commonly used for the treatment of serious gram-negative infections despite a high incidence of associated ototoxicity. Attempts to elucidate the mechanisms of toxicity or prevent the adverse effects have previously been unsuccessful. Recently, the damaging effects of aminoglycosides on the inner ear have been shown to be caused by a metabolite of the drug, implying an enzymatic conversion of the parent compound. Glutathione has been suggested to be closely related to the detoxification mechanisms of this metabolite. This study revealed the possible attenuation of aminoglycoside ototoxicity by glutathione. Guinea pigs were given amikacin alone or amikacin with prior intramuscular injection of glutathione. The pretreatment of glutathione significantly reduced the damage of outer hair cells of the organ of Corti. This may indicate that glutathione reduces the aminoglycoside ototoxicity and can be favorably applied in clinical use.
Insights
Glutathione may reduce hearing loss caused by aminoglycoside antibiotics. Pretreatment with glutathione significantly protected outer hair cells in guinea pigs, suggesting a potential clinical application for preventing aminoglycoside ototoxicity.
Area of Science:
- Ototoxicity research
- Pharmacology
- Drug safety
Background:
- Aminoglycoside antibiotics are crucial for treating gram-negative infections but often cause ototoxicity.
- Previous attempts to prevent aminoglycoside-induced hearing loss have been unsuccessful.
- Recent findings suggest a drug metabolite, possibly linked to glutathione, causes inner ear damage.
Purpose of the Study:
- To investigate the potential of glutathione in attenuating aminoglycoside ototoxicity.
- To determine if glutathione pretreatment can prevent hearing damage from aminoglycosides.
Main Methods:
- The study utilized guinea pigs as a model organism.
- Animals received either amikacin alone or amikacin combined with glutathione pretreatment.
- Damage to the outer hair cells of the organ of Corti was assessed.
Main Results:
- Glutathione pretreatment significantly reduced damage to the outer hair cells of the organ of Corti.
- This indicates a protective effect of glutathione against aminoglycoside-induced cochlear damage.
- The findings suggest a role for glutathione in the detoxification pathway of aminoglycosides.
Conclusions:
- Glutathione demonstrates a protective effect against aminoglycoside ototoxicity.
- This finding suggests glutathione could be a valuable adjunct in clinical settings to mitigate hearing loss associated with aminoglycoside therapy.
- Further research is warranted to explore the clinical application of glutathione for preventing aminoglycoside-induced ototoxicity.