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  • 1
    ISSN: 1432-069X
    Keywords: Haematoporphyrins ; Photochemotherapy ; Cytokines ; PUVA ; Photodynamic therapy ; Psoriasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Photodynamic therapy (PDT) consists of the combination of photosensitizers absorbing light mainly in the red spectral region and irradiation with light of corresponding wavelengths. We analysed its effects on the cytokine secretion (IL-1Β, TNFα, IL-6) of freshly isolated peripheral mononuclear cells from six patients with chronic plaque-stage psoriasis in comparison with PUVA. PUVA treatment resulted in a decreased production of all three cytokines, but most pronounced in the case of IL-6. PDT caused a similar change in the cytokine pattern, but its effectiveness was lower. In vivo fluorescence recordings were performed on psoriatic plaque lesions after topical application of the photosensitizer Photosan-3. Under irradiation, progressive photobleaching was noted with increasing radiation dosage. This is the first reported study of photochemical reactions using on-line fluorescence recordings during PDT of psoriatic lesions in vivo. Our results demonstrate the capacity of PDT to cause immunomodulatory effects similar to PUVA, thus indicating its potential application to the treatment of this common disease.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 120 (1994), S. 657-661 
    ISSN: 1432-1335
    Keywords: Photodynamic therapy ; Fluorescence ; 5-ALA ; Experimental colonic tumour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 307 (1981), S. 97-104 
    ISSN: 1618-2650
    Keywords: Analyse von Seltenen Erden ; Röntgenemissions-Spektrometrie ; PIXE ; Eichkurven ; Präzision ; Matrix-Effekte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Proton Induced X-ray Emission (PIXE) analysis calibration curves (i.e. intensity of analytical signal as a function of concentration c i ) are determined on thick solid samples with rare earth element concentrations c i ≤0.3g/g. The calibration curves are linear at low concentrations c i ≤0.3 weight% at proton energies 1.7≤E PO≤ 2.5MeV. The precision of the quantitative analysis amounts to ±4 %. The shape of the curves at higher concentrations may be understood by simple qualitative considerations. Distortions by interelement-effects caused by additional other rare earth elements j in concentrations c j ≤2 weight% are not detectable. The agreement between the experimental and the calculated intensities for different matrices is very good at low concentrations c i ≤1 weight% of analyte.
    Notes: Zusammenfassung Es werden Eichkurven (d. h. Intensität des Analysensignals in Abhängigkeit von der Analytkonzentration c i ) für die protoneninduzierte Röntgenspektralanalyse (PIXE) dicker Festkörperproben mit Seltenen Erdelementen im Konzentrationsbereich c i ≤0,3g/g aufgenommen. Diese Eichkurven verlaufen bei niedrigen Konzentrationen c i ≤ 0,3 Gewichts-% und Protonenenergien 1,7≤EPO≤2,5MeV linear. Die Genauigkeit der quantitativen Analyse beträgt ±4 %. Der Verlauf der Eichkurven bei höheren Konzentrationen kann durch einfache qualitative Überlegungen verstanden werden. Es werden keine Störungen durch Interelementeffekte beobachtet, die durch zusätzliche andere Seltene Erdelemente j in Konzentrationen c j ≤2 Gewichts-% hervorgerufen werden. Die Übereinstimmung der experimentellen und berechneten Intensitäten für verschiedene Matrices ist bei niedrigen Analytkonzentrationen c i ≤1 Gewichts-% sehr gut.
    Type of Medium: Electronic Resource
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