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Exploring Modes of Photokilling by Hypericin
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2020-06-01 , DOI: 10.1111/php.13275
David Kessel 1
Affiliation  

Effects of photodynamic therapy (PDT) using the anthraquinone hypericin were explored with OVCAR‐5 cells in vitro. Irradiation resulted in ER > lysosomal photodamage. Paraptosis was identified as a primary death pathway resulting from ER perturbation. This is characterized by an extensive pattern of cytoplasmic vacuole formation. As the PDT dose increased, apoptotic death was also detected. The cytoprotective effect of autophagy, observed when certain other subcellular sites are PDT targets, appears to be absent. These results, together with prior evidence that paraptosis can be lethal to cells with an impaired apoptotic pathway, suggest a role for agents with this targeting profile in photodynamic therapy. A limitation to be overcome for hypericin is a suboptimal absorbance profile.

中文翻译:

探索金丝桃素的光杀模式

使用 OVCAR-5 细胞在体外探索了使用蒽醌金丝桃素的光动力疗法 (PDT) 的效果。辐射导致 ER > 溶酶体光损伤。Paraptosis 被确定为由 ER 扰动导致的主要死亡途径。这以广泛的细胞质液泡形成模式为特征。随着 PDT 剂量的增加,也检测到细胞凋亡。当某些其他亚细胞位点是 PDT 靶点时,自噬的细胞保护作用似乎不存在。这些结果,连同先前的证据表明,细胞凋亡对凋亡途径受损的细胞可能是致命的,这表明具有这种靶向特性的药物在光动力疗法中发挥着作用。金丝桃素要克服的一个限制是次优的吸光度曲线。
更新日期:2020-06-01
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