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Metalloporphyrin phototoxicity.

J Scott1, J M Quirke, H J Vreman

  • 1Department of Biological Sciences, Florida International University, Miami 33199.

Journal of Photochemistry and Photobiology. B, Biology
|November 1, 1990
PubMed
Summary

Metal ions reduce the phototoxicity of protoporphyrin IX, with tin protoporphyrin (SnPP) showing notable effects on erythrocytes and enzymes. Different metal ions exhibit varying impacts on phototoxicity and biological activity.

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Area of Science:

  • Biochemistry
  • Photochemistry
  • Toxicology

Background:

  • Metalloporphyrins are compounds with potential applications in photodynamic therapy.
  • Understanding their phototoxicity is crucial for assessing their efficacy and safety.
  • Protoporphyrin IX derivatives are common photosensitizers.

Purpose of the Study:

  • To investigate the phototoxicities of six metalloporphyrin dimethylesters: cobalt (CoPP), copper (CuPP), manganese (MnPP), nickel (NiPP), tin (SnPP), and zinc (ZnPP).
  • To assess the impact of metal ions on the phototoxic efficacy of protoporphyrin IX.
  • To evaluate the biological activities of these metal complexes in different assay systems.

Main Methods:

  • Assessing phototoxicity through hemolysis of human erythrocytes.

Related Experiment Videos

  • Measuring the inactivation of acetylcholinesterase and beta-galactosidase enzymes.
  • Utilizing specific concentrations of metalloporphyrins and radiation doses.

    • Main Results:

    • Tin protoporphyrin (SnPP) was the only metalloporphyrin to cause erythrocyte hemolysis at 40 microM, though less efficiently than free porphyrins.
    • SnPP completely inactivated beta-galactosidase above 15 microM and interfered with acetylcholinesterase at 150 microM.
    • CoPP, CuPP, MnPP, NiPP, and ZnPP were ineffective photohemolytic agents but showed varying degrees of enzyme inactivation.

    Conclusions:

    • Metal ions generally reduce the phototoxicity of protoporphyrin IX.
    • The degree of phototoxicity reduction varies depending on the specific metal ion.
    • The biological activities of metalloporphyrin complexes differ across various experimental assays.