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Prevention of aminoglycoside-induced hearing loss
1Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan Medical Center, Ann Arbor 48109-0506, USA.
Abstract:
This review discusses the current problem of ototoxicity associated with the worldwide use of aminoglycoside antibiotics. Pathology and pathophysiology of cochlear and vestibular damage have long been recognized as a preferential destruction of hair cells beginning in the cochlea with the outer hair cells of the lower turns. This is accompanied by high frequency hearing loss progressing to lower frequencies during and even after treatment with these drugs. A novel hypothesis of the underlying biochemical mechanism is based on the formation of free radicals by an aminoglycoside-iron complex. A protective treatment against aminoglycoside-induced hearing loss by co-administration of iron chelators has been successfully documented in guinea pig. This pharmacological intervention does not change serum levels of aminoglycosides nor their antibacterial efficacy. Since iron chelators are established therapeutic drugs, the proposed treatment should lend itself to clinical application. Aminoglycosides, long established for their high efficacy and low cost, may thus continue to play an important role in combating infectious diseases.
Insights
Aminoglycoside antibiotics can cause hearing loss by damaging hair cells. A new study suggests iron chelators may prevent this ototoxicity without reducing antibiotic effectiveness, offering a promising clinical treatment.
Area of Science:
- Ototoxicology
- Pharmacology
- Biochemistry
Background:
- Aminoglycoside antibiotics are widely used but can cause ototoxicity, leading to hearing and balance problems.
- This damage typically involves the destruction of hair cells in the cochlea, starting with high-frequency hearing loss.
Purpose of the Study:
- To review the problem of aminoglycoside-induced ototoxicity.
- To propose a novel biochemical mechanism involving free radical formation.
- To evaluate a potential protective treatment against hearing loss.
Main Methods:
- Review of existing literature on aminoglycoside ototoxicity.
- Presentation of a new hypothesis on the role of iron-aminoglycoside complexes and free radicals.
- Summary of successful protective treatment studies in guinea pigs using iron chelators.
Main Results:
- Aminoglycoside-induced ototoxicity results in preferential hair cell destruction and progressive hearing loss.
- A novel hypothesis suggests free radical formation via an aminoglycoside-iron complex underlies this damage.
- Co-administration of iron chelators protected against hearing loss in guinea pigs.
Conclusions:
- Iron chelators offer a potential protective strategy against aminoglycoside-induced hearing loss.
- This intervention did not affect aminoglycoside levels or antibacterial efficacy.
- Iron chelators, being established drugs, could be readily applied in clinical settings, allowing continued use of essential aminoglycosides.