5-aminolaevulinic-acid-induced formation of different porphyrins and their photomodifications

The relative amounts of 5-aminolaevulinic acid (ALA)-induced hydrophobic and hydrophilic porphyrins produced in normal mouse tissue and solid Ehrlich ascites carcinoma in mice were investigated as a function of added glucose, light irradiation and restricted blood flow to the tumour. Protoporphyrin...

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Bibliographic Details
Published inLasers in medical science Vol. 12; no. 3; pp. 226 - 236
Main Authors Dietel, W, Fritsch, C, Pottier, R H, Wendenburg, R
Format Journal Article
LanguageEnglish
Published England Springer Nature B.V 01.10.1997
Subjects
Animal tissues
Ascites
Blood flow
Fluorescence
Hydrophobicity
Irradiation
Light irradiation
Maxima
Medical science
Mice
Mitochondria
Photobleaching
Photochemical reactions
Porphyrins
Protoporphyrin
Protoporphyrin IX
Radiation
Tumors
Tumours
Water chemistry
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Summary:The relative amounts of 5-aminolaevulinic acid (ALA)-induced hydrophobic and hydrophilic porphyrins produced in normal mouse tissue and solid Ehrlich ascites carcinoma in mice were investigated as a function of added glucose, light irradiation and restricted blood flow to the tumour. Protoporphyrin IX (PpIX) is the predominant porphyrin produced from exogenous ALA in tissues that have viable mitochondria. However, under special conditions which seem to be connected with a reduced viability of the mitochondria, the formation of water-soluble porphyrins can be observed in vivo. Fluorescence maxima of the water-soluble porphyrins are located in the region between 615 and 625 nm. Irradiation can further lead to the formation of PpIX photoproduct(s), showing a fluorescence emission band at 676 nm. The photobleaching of PpIX in normal tissue and tumour tissue is different under restricted blood flow. ALA-induced PpIX can be observed in the normal blood stream, and can be linked to a slower photobleaching than in tissue with restricted blood flow.
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ISSN:0268-8921
1435-604X
DOI:10.1007/BF02765103