非致死剂量高强度聚焦超声逆转K562／AO2细胞多药耐药的实验研究

目的探讨非致死剂量高强度聚焦超声（HIFU）逆转K562／AO2细胞多药耐药（MDR）的效能及其作用机制。方法（1）固定辐照时间或超声声强，应用不同声强或辐照时间的HIFU辐照K562、K562／AO2细胞株，观察HIFU的剂量-效应关系；（2）将K562／AO2细胞株分组为：阿霉素组（ADM组）、ADM加HIFU辐照组（HIFU组）、ADM加维拉帕米组（VRP组），分别观察各组细胞内的ADM浓度、细胞的抑制率和细胞凋亡情况；（3）检测HIFU干预前后K562／A02细胞的P—gP、PDCD5表达情况。结果（1）当辐照时间一定时（5s）声强越高肿瘤细胞存活率越低，当HIFU声强一定时（400w／cm^2）细胞存活率随HIFU辐照时间延长而下降；（2）在K562／AO2细胞株中HIFU、VRP干预均能提高细胞内ADM浓度，HIFU组、VRP组与ADM组比较P均〈0．01，HIFU组与VRP组比较P〉0．05；HIFU组、VRP组、ADM组均能抑制K562／AO2细胞的增殖和促使K562／AO2细胞发生凋亡。HIFU组、VRP组与ADM组比较P均〈0．01，HIFU组与VRP组比较P〉0．05；（3）HIFU辐照K562／AO2细胞后P—gP表达明显降低，PDCD5表达升高。结论非致死剂量HIFU辐照K562／AO2细胞能够提高耐药肿瘤细胞内的化疗药物浓度，增加耐药肿瘤细胞的抑制率和凋亡率。非致死剂量HIFU逆转MDR的可能机理是下调耐药细胞的P—gP表达和上调PDCD5表达。

The reversal effect of multidrug resistance by nonlethal dose-high intensity focused ultrasound in K562/AO2 cell line

Objective To study and evaluate the reversal effect of multi-drug resistance(MDR) and the mechanism by non-lethal dose-high intensity focused ultrasound(HIFU)in the K562/AO2 cell lines.Methods(1) With fixed exposure or acoustic intensity,the relationship between tumor cell livability and HIFU dosage was observed by different acoustic intensity and HIFU exposure duration in the K562,K562/AO2 cell lines;(2) The K562 and K562/AO2 cell lines were classified into groups: adriamycin(ADM);adriamycin plus HIFU and ...