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Necrosis depth and photodynamic threshold dose with redaporfin‐PDT
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2020-04-28 , DOI: 10.1111/php.13256
Luis B Rocha 1 , Helder T Soares 1 , Maria Inês P Mendes 1 , António Cabrita 2 , Fábio A Schaberle 1 , Luís G Arnaut 1
Affiliation  

Predicting the extent of necrosis in photodynamic therapy (PDT) is critical to ensure that the whole tumor is treated but vital structures, such as major blood vessels in the vicinity of the tumor, are spared. The models developed for clinical planning rely on empirical parameters that change with the nature of the photosensitizer and the target tissue. This work presents an in vivo study of the necrosis in the livers of rats due to PDT with a bacteriochlorin photosensitizer named redaporfin using both frontal illumination and interstitial illumination. Various doses of light at 750 nm were delivered 15 min postintravenous administration of redaporfin. Sharp boundaries between necrotic and healthy tissues were found. Frontal illumination allowed for the determination of the photodynamic threshold dose—1.5 × 1019 photons cm−3—which means that the regions of the tissues exposed to more than 11 mm of ROS evolved to necrosis. Interstitial illumination produced a necrotic radius of 0.7 cm for a light dose of 100 J cm−1 and a redaporfin dose of 0.75 mg kg−1. The experimental data obtained can be used to inform and improve clinical planning with frontal and interstitial illumination protocols.

中文翻译:

redaporfin-PDT 的坏死深度和光动力阈值剂量

预测光动力疗法 (PDT) 中的坏死程度对于确保整个肿瘤得到治疗但重要结构(例如肿瘤附近的主要血管)免受伤害至关重要。为临床计划开发的模型依赖于随着光敏剂和目标组织的性质而变化的经验参数。这项工作介绍了使用正面照明和间质照明,使用名为 redaporfin 的菌绿素光敏剂对 PDT 引起的大鼠肝脏坏死的体内研究。在静脉内施用瑞达泊芬后 15 分钟,递送不同剂量的 750 nm 光。发现坏死组织和健康组织之间存在明显的界限。正面照明允许确定光动力阈值剂量 - 1。5 × 1019 光子 cm−3——这意味着暴露于 11 mm 以上 ROS 的组织区域演变为坏死。对于 100 J cm-1 的光剂量和 0.75 mg kg-1 的 redaporfin 剂量,间隙照射产生 0.7 cm 的坏死半径。获得的实验数据可用于通过正面和间质照明协议通知和改进临床计划。
更新日期:2020-04-28
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