超声激活血卟啉对腹水型艾氏腹水瘤超微结构的影响

EFFECT OF ULTRASONICALLY ACTIVATED HEMATOPORPHYRIN ON EHRLICH ASCITES TUMOR CELLS IN VITRO

目的观察声动力学疗法(SDT)对肿瘤细胞超微结构的影响,探讨超声激活血卟啉杀伤肿瘤细胞的机制。方法采用频率为2.0MHz,声强为1.5W cm2的超声,结合血卟啉(HpD)对离体培养的小鼠艾氏腹水瘤(EAT)细胞处理3min,利用透射电镜观察不同时间段取材的细胞超微结构的变化。结果超声激活血卟啉对EAT细胞超微结构的破坏程度随取材时间的延长而加剧,损伤位点主要集中在细胞膜、线粒体、内质网及细胞核上,同时还观察到一些细胞表现出明显的凋亡特征。结论超声激活血卟啉主要通过破坏细胞超微结构杀伤肿瘤细胞,部分通过诱导凋亡杀伤。

Objective The aim of this study was to investigate the effect of ultrasonically activated hematoporphyrin on ultrastructure of ehrlich ascites tumor(EAT) cells and to evaluate the potential mechanism of action inducing this cytotoxicity. Methods EAT cells in vitro were exposed to ultrasound at 2^0?MHz and 1^5?W/cm+2 for 3?min in the presence or absence of hematoporphyrin.The changes of ultrastructure of sample preparation for different time were observed by transmission electron microscope. Results The degree of destruction of treated EAT cells was enhanced with the increasing of time for the sample preparation.The sites destroyed mainly involved cell membrane,mitochondrion,endoplasmic reticulum and cell nuclei.Furthermore,morphoiogical characters of ultrasound-activated hematoporphyrin induced apoptosis were observed on EAT cells.Conclusion The killing of tumor cells was ascribed mainly to the damage of ultrastructure induced by ultrasound in combined with hematoporphyrin,apoptosis was also induced during ultrasound and hematoporphyrin killing process.;