Interaction of neomycin, tobramycin and amikacin with melanin in vitro in relation to aminoglycosides-induced ototoxicity.
Pharmazie
; 62(3): 210-5, 2007 Mar.
Article
en En
| MEDLINE
| ID: mdl-17416198
The aim of this study was to examine in vitro the interaction between aminoglycoside antibiotics displaying adverse ototoxic effects and melanin which is a constituent of the inner ear. The binding of neomycin, tobramycin and amikacin to model synthetic melanin was studied. It has been demonstrated that all the investigated aminoglycosides form stable complexes with melanin biopolymer. The obtained results show that the amount of drug bound to melanin increases with the increase of initial drug concentration and the incubation time. An analysis of drugs binding to melanin by the use of Scatchard plots has shown that at least two classes of independent binding sites must be implicated in the studied aminoglycoside antibiotic-melanin complexes formation: strong binding sites (n1) with the association constant K1 approximately 0.2-2.0 x 10(5) M(-1) and weak binding sites (n2) with K2 approximately 1.0-4.9 x 10(3) M(-1). Based on the values of association constants the following order of drugs affinity to DOPA-melanin was found: tobramycin > amikacin >> neomycin. The ability of the analyzed aminoglycoside antibiotics to form complexes with melanin in vitro may be one of the reasons for their ototoxicity in vivo, as a result of their accumulation in melanin in the inner ear.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Tobramicina
/
Amicacina
/
Neomicina
/
Aminoglicósidos
/
Trastornos de la Audición
/
Melaninas
/
Antibacterianos
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Pharmazie
Asunto de la revista:
FARMACIA
Año:
2007
Tipo del documento:
Article
País de afiliación:
Polonia
Pais de publicación:
Alemania