Gentamicin inhibits renal protein and phospholipid metabolism in rats: implications involving intracellular

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Single-channel Analysis and Calcium Imaging in the Podocytes of the Freshly Isolated Glomeruli
12:19

Single-channel Analysis and Calcium Imaging in the Podocytes of the Freshly Isolated Glomeruli

Published on: June 27, 2015

David P Sundin1, Ruben Sandoval1, Bruce A Molitoris1

  • 1Department of Medicine, Division of Nephrology, Indiana University School of Medicine, and the Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana.

Journal of the American Society of Nephrology : JASN
|January 3, 2001
PubMed

Insights

Gentamicin disrupts kidney cell protein synthesis and alters phospholipid metabolism, primarily by inhibiting degradation. This leads to cellular damage and suggests retrograde trafficking as a key mechanism in gentamicin-induced nephrotoxicity.

Area of Science:

  • Nephrology
  • Molecular Toxicology
  • Cell Biology

Background:

  • Aminoglycosides, like gentamicin, are crucial antibiotics but can cause kidney damage (nephrotoxicity).
  • Understanding the early cellular mechanisms of gentamicin nephrotoxicity is vital for developing protective strategies.

Purpose of the Study:

  • To elucidate the early molecular mechanisms underlying gentamicin-induced nephrotoxicity.
  • To investigate the effects of gentamicin on cellular protein and phospholipid metabolism in the kidney.

Main Methods:

  • In vivo protein synthesis assays in rat kidney cortical homogenates and brush border membrane (BBM) preparations.
  • Analysis of phospholipid content and synthesis in cortical homogenates and BBM.
  • Confocal and electron microscopy to visualize gentamicin localization and cellular structures.

Main Results:

  • Gentamicin significantly inhibited kidney cell protein synthesis starting from day 2 of treatment.
  • Alterations in phospholipid metabolism were observed, with increased total phospholipids and specific changes in phosphatidylinositol, phosphatidylcholine, and sphingomyelin (SPH) in BBM.
  • Microscopy revealed gentamicin accumulation in lysosomal, Golgi, and mitochondrial structures, suggesting retrograde trafficking.

Conclusions:

  • Inhibition of phospholipid degradation is a major contributor to gentamicin's effects on kidney phospholipid metabolism.
  • Gentamicin-induced nephrotoxicity may involve retrograde trafficking within kidney cells.
  • These findings provide insights into the cellular basis of aminoglycoside nephrotoxicity.

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