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Dependence of photodynamic threshold dose on treatment parameters in normal rat liver in vivo

机译:光动力学阈值剂量对正常大鼠肝脏体内治疗参数的依赖性

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Abstract: The validity and utility of the measurement of the photodynamic threshold dose as an in vivo tool for quantitatively assessing the effectiveness of performing photodynamic therapy (PDT) using differing photosensitizers, irradiation protocols and adjuvant treatments was examined. The depth of the boundary between necrotic tissue and normal tissue following surface irradiation of normal rat liver was used to calculate the photodynamic threshold, a quantity independent of photosensitizer concentration, light fluence and wavelength. PDT was performed using Photofrin II to investigate the changes in photodynamic threshold using four different treatment conditions. Using a range of values for photosensitizer concentration and total light fluence, the photodynamic threshold was found to be independent of these parameters and estimated as (3.4 $POM@0.3) $MUL 10$+18$/ photons cm$+$MIN@3$/. Using periodic light irradiation schedules to determine if diffusion of $+3$/O$-2$/ affects the threshold measurement, the photodynamic thresholds were found not to be significantly different from those using normal irradiation which suggests that this model is not sensitive to this parameter. PDT was performed in conjunction with hyperthermia and significant reductions in the photodynamic threshold were obtained if hyperthermia followed PDT but not if hyperthermia preceded PDT. Finally, the effects of the radio-protecting agents WR-77913 and WR-2721 were examined and significant increases in the photodynamic threshold were obtained for PDT performed following injection of sufficient quantity of either radio-protecting drug.!
机译:摘要:研究了测量光动力阈值剂量作为一种体内工具的有效性和实用性,该工具用于定量评估使用不同的光敏剂,辐照方案和辅助治疗进行光动力治疗(PDT)的有效性。用正常大鼠肝脏表面照射后坏死组织与正常组织之间的边界深度来计算光动力阈值,该量与光敏剂浓度,光通量和波长无关。使用Photofrin II进行PDT,以研究四种不同治疗条件下光动力阈值的变化。使用光敏剂浓度和总光通量的一系列值,发现光动力学阈值与这些参数无关,并且估计为(3.4 $POM@0.3)$ MUL 10 $ + 18 $ /光子cm $ + $ MIN @ 3 $ /。使用定期光照射时间表确定$ + 3 $ / O $ -2 $ /的扩散是否影响阈值测量,发现光动力学阈值与使用正常照射的光动力学阈值没有显着差异,这表明该模型对以下参数不敏感此参数。 PDT与热疗结合进行,如果热疗紧随PDT,则光动力学阈值显​​着降低,但如果热疗紧随PDT,则光动力学阈值未明显降低。最后,检查了放射防护剂WR-77913和WR-2721的作用,并在注射足够量的两种​​放射防护剂后对PDT进行了光动力学阈值的显着提高。

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