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• W2001790003 abstract "ABSTRACT The interactions of sulfonated chloroaluminum phthalocyanine (AlPcS n ) with human low‐density lipoproteins (LDL) were studied in vitro in human plasma and in an isolated LDL fraction, in order to understand the potential effects of the sensitizer against LDL. The AlPcS n added to plasma distributes in all lipoproteins as observed by the drastic color changes of the separated fractions by ultracentrifugation. In isolated LDL, incubation with AlPcS n causes fluorescence quenching of the apoprotein tryptophan residues. Furthermore, AlPcS n incorporates in liposomes, with a lipid composition similar to the external monolayer of human LDL, as indicated by absorbance spectroscopy. The photosensitizing properties of AlPcS n in LDL particles were studied on the basis of the fluorescence quenching of previously incorporated cis ‐parinaric acid (PnA), used as an oxidation probe, and of O 2 consumption. The photooxidation of either PnA or LDL lipids is highly dependent on irradiation time and on the dye concentration. Moreover, photooxidation of LDL proceeds only during the illumination period. After stopping the illumination and upon addition of Cu 2+ to the LDL solution, the oxidative rate is resumed, probably due to hydroperoxide cleavage and formation of species able to propagate the oxidative reaction. Thus, our data indicate that AlPcS n distributes in human plasma lipoproteins and, in isolated LDL, it can interact either with the lipid phase or the apoprotein. The photooxidation of LDL induced by AlPcS n seems to involve singlet oxygen as the main reactive species in the degradative process." @default.
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• W2001790003 date "1998-04-01" @default.
• W2001790003 modified "2023-09-29" @default.
• W2001790003 title "Sulfonated Chloroaluminum Phthalocyanine Incorporates into Human Plasma Lipoproteins: Photooxidation of Low-Density Lipoproteins" @default.
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• W2001790003 doi "https://doi.org/10.1111/j.1751-1097.1998.tb05214.x" @default.
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