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Related Experiment Videos

Does delta-aminolaevulinic acid induce genotoxic effects?

D M Fiedler1, P M Eckl, B Krammer

  • 1University of Salzburg, Institute of Physics and Biophysics, Austria.

Journal of Photochemistry and Photobiology. B, Biology
|March 1, 1996
PubMed
Summary

5-Aminolaevulinic acid (ALA) can induce DNA damage in rat hepatocytes by increasing chromosomal aberrations and micronuclei. These genotoxic effects appear to be linked to the accumulation of protoporphyrin IX (PpIX) at higher ALA concentrations.

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Area of Science:

  • Biochemistry
  • Genetics
  • Toxicology

Background:

  • 5-Aminolaevulinic acid (ALA) is a heme precursor that can accumulate protoporphyrin IX (PpIX) when administered exogenously.
  • Photodynamic therapy (PDT) utilizes photosensitizers like PpIX, but ALA can also auto-oxidize, potentially causing DNA damage.
  • Rat hepatocytes are sensitive indicators of genotoxicity from lipid peroxidation products.

Purpose of the Study:

  • To investigate the potential mutagenic effects of ALA in rat hepatocytes in the absence of light.
  • To determine if ALA induces genotoxicity through chromosomal aberrations and micronuclei formation.
  • To explore the relationship between PpIX accumulation and ALA-induced genotoxicity.

Main Methods:

  • Cultures of rat hepatocytes were treated with varying concentrations of ALA.

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  • Cytogenetic endpoints, including chromosomal aberrations and micronuclei induction, were analyzed.
  • PpIX formation kinetics were studied at different ALA concentrations.

    • Main Results:

    • Significantly elevated levels of chromosomal aberrations and micronuclei were observed at ALA concentrations of 1 µg/mL and higher.
    • Both endpoints increased with ALA concentration up to 100 µg/mL.
    • Chromosomal aberrations remained elevated at higher concentrations, while micronuclei decreased, suggesting PpIX may induce chromosomal aberrations.

    Conclusions:

    • ALA induces genotoxic effects in rat hepatocytes, evidenced by increased chromosomal aberrations and micronuclei.
    • The accumulation of PpIX, a downstream product of ALA, is implicated in the induction of chromosomal aberrations.
    • ALA has the potential to induce DNA damage independent of light activation, suggesting a need for careful consideration in therapeutic applications.