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Related Experiment Videos

Sulfur-containing amino acids decrease cisplatin cytotoxicity and uptake in renal tubule epithelial cell lines.

R Kröning1, A K Lichtenstein, G T Nagami

  • 1UCLA Department of Medicine, VA Greater Los Angeles Healthcare System, CA 90073, USA. rkroning@yahoo.com

Cancer Chemotherapy and Pharmacology
|January 27, 2000
PubMed
Summary

Certain amino acids, including cysteine, can reduce cisplatin-induced kidney toxicity and uptake in renal cells. These findings suggest potential therapeutic strategies for mitigating chemotherapy side effects.

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Area of Science:

  • Nephrology
  • Pharmacology
  • Biochemistry

Background:

  • Cisplatin (DDP) chemotherapy causes dose-limiting nephrotoxicity, partly due to its accumulation in kidney tissue.
  • Current therapeutic options to prevent DDP-induced kidney damage are limited.
  • Certain amino acids (AAs) have shown potential in modulating DDP nephrotoxicity in vivo.

Purpose of the Study:

  • To investigate the potential of all 20 protein AAs, N-acetylcysteine, and DL-homocysteine to reduce DDP cytotoxicity and uptake.
  • To evaluate these agents in specific renal tubule cell lines (S1, S3, and DCT).

Main Methods:

  • Utilized immortalized mouse renal tubule epithelial cell lines (S1, S3, DCT).
  • Exposed cells to DDP with or without concurrent AA exposure in Krebs-Ringer buffer.

Related Experiment Videos

  • Assessed cytotoxicity using MTT assay 48 hours post-exposure and DDP accumulation via atomic absorption spectroscopy after 1-hour incubation.

    • Main Results:

    • Cysteine (Cys), methionine (Met), N-acetylcysteine, and DL-homocysteine significantly reduced DDP toxicity and uptake.
    • Cysteine demonstrated the most potent effect, reducing cytotoxicity by up to 79% in S3 cells and inhibiting DDP uptake by up to 39%.
    • Pre-complexing DDP with Cys reduced toxicity but increased uptake, suggesting complex mechanisms of action.

    Conclusions:

    • Cys, Met, N-acetylcysteine, and DL-homocysteine differentially inhibit DDP toxicity and uptake in renal cells.
    • Inhibition of DDP uptake and intracellular complexation with Cys may prevent nephrotoxicity.
    • The shared structural element R-CH(NH2)-[CH2]1 2-S-R in these molecules may be key to blocking DDP transport, offering potential clinical applications.