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Developing a structure-function relationship for anionic porphyrazines exhibiting selective anti-tumor activity.

Benjamin J Vesper1, Sangwan Lee, Neal D Hammer

  • 1Center for Molecular Biology of Oral Diseases, University of Illinois - Chicago, College of Dentistry, 801 S. Paulina, Chicago, IL 60612, USA. vesperbe@uic.edu

Journal of Photochemistry and Photobiology. B, Biology
|January 4, 2006
PubMed
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Anionic porphyrazines (pzs) with fewer negative charges selectively kill tumor cells. This selectivity is linked to charge, not singlet oxygen yield, offering a new strategy for targeted cancer therapy.

Area of Science:

  • Medicinal Chemistry
  • Photodynamic Therapy
  • Molecular Imaging

Background:

  • Porphyrazines (pzs) are porphyrin derivatives explored for optical imaging and photodynamic therapy (PDT).
  • Previous work showed anionic pz 18 selectively killed tumor cells, unlike neutral or cationic analogs.

Purpose of the Study:

  • To compare the biological properties of three H2[pz(An;B4-n)] porphyrazines with varying net negative charges (n=4, 3, and 2).
  • To investigate the relationship between porphyrazine charge, hydrophobicity, singlet oxygen yield, and anti-tumor activity.

Main Methods:

  • Synthesized and characterized three porphyrazines (pzs 4, 11, and 18) with differing numbers of carboxylate groups (n=4, 3, 2).
  • Assessed biological activity using human lung carcinoma (A549) and SV40 transformed embryonic (WI-38 VA13) cell lines.

Related Experiment Videos

  • Measured singlet oxygen quantum yields (PhiDelta) for each compound.

    • Main Results:

    • Porphyrazines 4 (n=4) and 11 (n=3) showed significant toxicity to both tumor and normal cells.
    • Porphyrazine 18 (n=2) demonstrated selective anti-tumor activity in a dose-dependent manner.
    • Toxicity correlated inversely with net negative charge; lower charge led to less normal cell toxicity and light-independent killing.

    Conclusions:

    • Anionic porphyrazine selectivity as anti-tumor agents is primarily dependent on the net number of negative charges, not singlet oxygen quantum yields.
    • Porphyrazines with fewer negative charges (lower n) and larger hydrophobic cores exhibit greater tumor specificity.
    • Modifying porphyrazine charge offers a tunable approach to varying their biological behavior for targeted cancer treatment.