目的 考察HepG2.2.15细胞对同时包载丁香苦苷和羟基酪醇纳米粒(nanoparticles co-loaded with syringopicroside and hydroxytyrosol,SH-NPs)的摄取机制.方法 采用沉淀法制备SH-NPs,以异硫氰酸荧光素为荧光标记物,采用流式细胞仪研究HepG2.2.15细胞对SH-NPs的摄取机制.结果 秋水仙素为抑制剂,孵育时间在0.5~24 h范围内,阳性细胞百分数由1.9%增加到56.4%;药物浓度为125、250、500 μg/mL时,阳性细胞百分数分别为4.9%、3.4%、3.9%.氯喹为抑制剂,孵育时间在0.5~24 h范围内,阳性细胞百分数由7.4%增加到55.4%;药物浓度为125、250、500 μg/mL时,阳性细胞百分数分别为19.5%、22.5%、27.6%.结论 秋水仙素与氯喹对HepG2.2.15细胞摄取有抑制作用,且HepG2.2.15细胞对SH-NPs的摄取与药物浓度、孵育时间呈正相关,推断HepG2.2.15细胞对SH-NPs细胞的摄取机制为非特异性吸附内吞.%Objective To investigate the uptake mechanism of HepG2.2.15 cells to the nanoparticles co-loaded with syringopicroside and hydroxytyrosol (SH-NPs). Methods The nanoparticles were prepared by using a nanoprecipitation method with mPEG-PLGA as nano-carrier co-loaded with syringopicroside and hydroxytyrosol. The uptake mechanism of HepG2.2.15 cells to SH-NPs was studied by fluorescence microscopy and flow cytometry using fluoresceineisothiocyanate (FITC) as a fluorescent marker. Results With colchicine as the inhibitor, the incubation time ranged from 0.5 to 24 h, the percentage of positive cells increased from 1.9% to 56.4%; When the drug concentration was 125, 250 μg/mL and 500 μg/mL, the positive cell percentages were 4.9%, 3.4% and 3.9%. With chloroquine as the inhibitor; the incubation time ranged from 0.5 to 24 h, the percentage of positive cells increased from 7.4% to 55.4%; When the drug concentration was 125, 250 and 500 μg/mL, the percentage of positive cells was 19.5%, 22.5% and 27.6%. Conclusion Colchicine and chloroquine have an inhibitory effect on HepG2.2.15 cells uptake, and the uptake of SH-NPs in HepG2.2.15 cells was positively correlated with drug concentration and incubation time. It can be concluded that the uptake mechanism of HepG2.2.15 cells to SH-NPs was nonspecific adsorption endocytosis.
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