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Modulation of melanogenesis and antioxidant defense system in melanocytes by amikacin

Dorota Wrześniok1, Artur Beberok, Michał Otręba

  • 1Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Medical University of Silesia, Jagiellońska 4, PL 41-200 Sosnowiec, Poland.

Toxicology in Vitro : an International Journal Published in Association with BIBRA
|February 19, 2013
PubMed

Insights

Amikacin antibiotic use may harm hearing by affecting melanin production and antioxidant defenses in melanocytes, potentially explaining ototoxicity. Further research is needed to understand these mechanisms.

Area of Science:

  • Cell Biology
  • Pharmacology
  • Toxicology

Background:

  • Amikacin is an important antibiotic for treating resistant infections.
  • Ototoxicity is a known side effect of amikacin, but its mechanism is unclear.

Purpose of the Study:

  • To investigate amikacin's effects on melanogenesis and antioxidant defense in human melanocytes.
  • To explore the potential role of melanocytes in amikacin-induced ototoxicity.

Main Methods:

  • Cultured human normal melanocytes (HEMa-LP) were exposed to varying concentrations of amikacin.
  • Cell viability, melanin biosynthesis, tyrosinase activity, and antioxidant enzyme activities (SOD, CAT, GPx) were measured.

Main Results:

  • Amikacin reduced melanocyte viability in a dose-dependent manner (EC50 ~7.5 mM).
  • Melanin production and tyrosinase activity were inhibited by amikacin.
  • Activities of cellular antioxidant enzymes superoxide dismutase, catalase, and glutathione peroxidase were significantly altered.

Conclusions:

  • Amikacin impacts melanogenesis and antioxidant status in melanocytes.
  • These findings suggest melanocytes and melanin may play a role in the ototoxic effects of aminoglycosides like amikacin.

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