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Molecular parameters involved in aminoglycoside nephrotoxicity
M P Mingeot-Leclercq1, R Brasseur, A Schanck
1Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, Brussels, Belgium.
Journal of Toxicology and Environmental Health
|March 1, 1995
Summary
Aminoglycoside antibiotics can harm kidneys by interacting with cell membranes. This interaction impairs phospholipid metabolism, a key factor in kidney toxicity, but not directly related to changes in membrane permeability.
Area of Science:
- Pharmacology
- Biochemistry
- Molecular Biology
Background:
- Aminoglycoside antibiotics are widely used but cause oto- and nephrotoxicity.
- Understanding the molecular basis of aminoglycoside-induced nephrotoxicity is crucial for developing safer drugs.
Purpose of the Study:
- To review the role of molecular interactions between aminoglycosides and cell membranes in the development of nephrotoxicity.
- To elucidate the mechanisms underlying aminoglycoside-induced kidney damage.
Main Methods:
- Utilized 31P and 15N Nuclear Magnetic Resonance (NMR) spectroscopy to study aminoglycoside-phospholipid interactions.
- Employed fluorescence depolarization and biochemical analyses to investigate membrane properties and phospholipid metabolism.
- Conformational analysis was used to determine aminoglycoside orientation at the lipid-water interface.
Main Results:
- Aminoglycoside binding to negatively charged membranes leads to impaired phospholipid catabolism, altered membrane permeability, and membrane aggregation.
- Nephrotoxic aminoglycosides can sequester phosphatidylinositol, reducing negative charge and inhibiting lysosomal phospholipase activity.
- Aminoglycoside orientation at the membrane interface influences both phospholipase inhibition and membrane permeability changes.
Conclusions:
- Impairment of phospholipid catabolism is an early and significant step in aminoglycoside nephrotoxicity, independent of membrane permeability changes.
- The specific orientation of aminoglycosides at the membrane interface is critical for their toxic effects.
- Further research is needed to fully understand the roles of membrane permeability and aggregation in aminoglycoside nephrotoxicity.