The effect of porphyrins on normal and transformed mouse cell lines in the presence of visible light

Photodynamic therapy consists of the uptake of a photosensitizing dye, often a porphyrin, by tumor tissue and subsequent irradiation of the tumor with visible light of an appropriate wavelength matched to the absorption spectrum of the photosensitizing dye. This class of molecules produces reactive...

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Bibliographic Details
Published in:Brazilian journal of medical and biological research 2001-10, Vol.34 (10), p.1331-1336
Main Authors: Tita, S P, Perussi, J R
Format: Article
Language:English
Subjects:
Animals
BIOLOGY
Cell Line
Cell Line, Transformed
Cell Survival - drug effects
Cell Survival - radiation effects
Fibroblasts - drug effects
Fibroblasts - radiation effects
MEDICINE, RESEARCH & EXPERIMENTAL
Mice
Mice, Inbred BALB C
mouse fibroblast lines A31 and B61
photodynamic therapy
Photosensitizing Agents - pharmacology
Phototherapy
Porphyrins - pharmacology
Radiation-Sensitizing Agents - pharmacology
Solubility
visible light
water-soluble porphyrins
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Summary:Photodynamic therapy consists of the uptake of a photosensitizing dye, often a porphyrin, by tumor tissue and subsequent irradiation of the tumor with visible light of an appropriate wavelength matched to the absorption spectrum of the photosensitizing dye. This class of molecules produces reactive oxygen species when activated by light, resulting in a direct or indirect cytotoxic effect on the target cells. Photodynamic therapy has been used in the treatment of cancer but the technology has a potential for the treatment of several disease conditions mainly because of its selectivity. However, it is not clear why the porphyrins are retained preferentially by abnormal tissue. This paper describes a study of the effect of the association of porphyrin and visible light on two mouse fibroblast cell lines: A31, normal cells and B61, an EJ-ras transformed variant of A31. Two water-soluble porphyrins were used, a positively charged one, tetra(N-methyl-4-pyridyl)porphyrin chloride, and a negatively charged one, tetra(4-sulfonatophenyl)porphyrin-Na salt (TPPS4) in order to assess the effect on cell survival. The results suggest that the B61 cell line is more sensitive to incubation with the anionic porphyrin (TPPS4) followed by light irradiation and that the anionic porphyrin is more efficient in killing the cells than the cationic porphyrin.
ISSN:0100-879X
1414-431X
0100-879X
1414-431X
DOI:10.1590/S0100-879X2001001000014