Photodynamic therapy of experimental colonic tumours with 5-aminolevulinic-acid-induced endogenous porphyrins View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1994-11

AUTHORS

K. Orth, K. König, F. Genze, A. Rück

ABSTRACT

5-Aminolevulinic acid (5-ALA) is a precursor in the biosynthesis of haem. External application of 5-ALA leads to the formation of protoporphyrin IX, the last intermediate product before haem, which is an effective sensitiser. The 5-ALA-induced endogenous photosensitisation of tumour cells has been exploited for photodynamic therapy (PDT). Experimental human G-3 colonic tumours were transplanted into nude mice, and ten mice were treated by PDT. Ten animals served as controls. We measured a fluorescence intensity of the tumour that was about eight times higher than in the surrounding tissue; a good correlation between the fluorescence intensity and the photodynamic effect was found. Tumour growth was inhibited significantly after PDT, two tumours being destroyed completely after the second PDT treatment. In addition, on-line fluorescence detection during PDT showed a change in the intensity and the fluorescence spectrum of protoporphyrin IX caused by photobleaching and the formation of photoproducts. More... »

PAGES

657-661

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01245377

DOI

http://dx.doi.org/10.1007/bf01245377

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1002141457

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/7962041


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