In vitro mechanisms and models of gentamicin nephrotoxicity

Area of Science:

• Nephrology
• Toxicology
• Cell Biology

Background:

• Gentamicin is a vital antibiotic, but its use is limited by dose-dependent kidney toxicity (nephrotoxicity).
• Previous attempts to mitigate gentamicin nephrotoxicity using polyaspartic acids showed promise but also adverse effects.
• Investigating novel protective agents is crucial for safe and effective gentamicin therapy.

Purpose of the Study:

• To evaluate the nephroprotective potential of magnesium-l-aspartate-hydrochloride against gentamicin-induced kidney damage.
• To assess the efficacy of magnesium-l-aspartate-hydrochloride in established in vitro models of nephrotoxicity.
• To elucidate the mechanism by which magnesium-l-aspartate-hydrochloride may counteract gentamicin's toxic effects.

Main Methods:

• Primary cultures of rat renal proximal tubular cells were used to assess gentamicin's impact on DNA, protein content, and calcium uptake.
• Established renal epithelial cell lines (LLC-PK(1) and MDCK) were employed to evaluate gentamicin's effect on intercellular communication via transepithelial resistance.
• The binding of radiolabeled gentamicin to renal cells and cell viability were analyzed using flow cytometry.

Main Results:

• Gentamicin administration reduced DNA and protein content and impaired calcium uptake in primary renal proximal tubular cells.
• Magnesium-l-aspartate-hydrochloride significantly decreased the binding of gentamicin to renal cells.
• Gentamicin disrupted intercellular communication in renal cell lines, an effect abolished by magnesium-l-aspartate-hydrochloride.

Conclusions:

• The studied in vitro systems effectively model gentamicin nephrotoxicity.
• Magnesium-l-aspartate-hydrochloride demonstrates significant nephroprotective effects against gentamicin in these models.
• Magnesium-l-aspartate-hydrochloride shows potential for clinical use in preventing gentamicin-induced kidney damage.