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13 July 2009 In vitro and in vivo studies of new photoluminescent oxygen sensors for non-invasive intravascular pO2 measurements
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Proceedings Volume 7380, Photodynamic Therapy: Back to the Future; 73806N (2009)
Event: 12th World Congress of the International Photodynamic Association, 2009, Seattle, Washington, United States
The concentration of oxygen and its rate of consumption are important factors playing a role in PDT and radiotherapy. One of the methods for measuring the tissular oxygen partial pressure (pO2) is based on the use of luminophores presenting an oxygen-dependent quenching of their phosphorescence. The time-resolved luminescence spectroscopy of palladium (PdTCPP) or ruthenium (RuDPP) porphyrin complexes is used for this purpose. Unfortunately, these porphyrin derivatives are phototoxic and leak rapidly out of the blood vessels, making them unsuitable for measuring tissular and or intravascular pO2. Therefore, this research aimed at developing and testing new biocompatible, non-phototoxic oxygen sensors based on palladium complexes incorporated into oxygen permeable, polysaccharide-based nanoparticles appropriate for noninvasive in situ and in vivo measurements of the pO2. In vitro studies, performed with an optical fiber-based time-resolved spectrophotometer, showed that the incorporation of such pO2 probes in nanovectors reduces their sensitivity to oxygen as well as their photobleaching by less than one order of magnitude. However, in vivo biocompatibility studies performed on the chick's embryo chorioallantoic membrane (CAM) model demonstrated that the luminescence of those oxygen probes tends to be heterogeneously distributed within the vasculature. In addition, these probes induce a 'clumping tendency', resulting in a more or less decreased viability of the embryos.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Patrycja Nowak-Sliwinska, Eddy Forte, Hubert van den Bergh, and Georges Wagnières "In vitro and in vivo studies of new photoluminescent oxygen sensors for non-invasive intravascular pO2 measurements", Proc. SPIE 7380, Photodynamic Therapy: Back to the Future, 73806N (13 July 2009);

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