Ontology type: schema:ScholarlyArticle
1994-11
AUTHORSK. Orth, K. König, F. Genze, A. Rück
ABSTRACT5-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... »
PAGES657-661
http://scigraph.springernature.com/pub.10.1007/bf01245377
DOIhttp://dx.doi.org/10.1007/bf01245377
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/7962041
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