目的:探讨高迁移率族蛋白B1(high mobility group box-1,HMGB1)对宫颈癌细胞化学治疗敏感性的影响及其机制。方法:采用Western印迹法检测宫颈癌细胞HeLa和CaSki经不同药物浓度顺铂处理后LC3,Beclin1及P62的表达水平,检测使用自噬抑制剂...目的:探讨高迁移率族蛋白B1(high mobility group box-1,HMGB1)对宫颈癌细胞化学治疗敏感性的影响及其机制。方法:采用Western印迹法检测宫颈癌细胞HeLa和CaSki经不同药物浓度顺铂处理后LC3,Beclin1及P62的表达水平,检测使用自噬抑制剂和/或顺铂处理后宫颈癌细胞HeLa和CaSki中LC3,Beclin1及P62的表达水平;采用细胞计数试剂盒8(cell counting kit-8,CCK-8)检测细胞增殖水平。构建HeLa-sh HMGB1,CaSkish HMGB1,HeLa-CTR及CaSki-CTR的稳定细胞系。以CCK-8检测上述细胞系顺铂半数抑制浓度(half maximum inhibitory concentration,IC50)水平;Western印迹法检测上述细胞系中HMGB1,LC3,Beclin1及P62的表达水平。结果:在一定浓度范围内,随着顺铂药物浓度的增加,宫颈癌细胞HeLa和CaSki中LC3及Beclin1的表达增加,P62表达降低。与单用顺铂组相比,顺铂联合自噬抑制剂组细胞存活率更低(P<0.05)。在宫颈癌细胞中,HMGB1的表达与顺铂药物敏感性有关(P<0.05),与LC3,Beclin1表达呈正相关,与P62表达呈负相关。结论:HMGB1可能通过调控宫颈癌细胞内自噬的水平,影响其对顺铂的敏感性。铂类药物结合自噬抑制剂可能成为宫颈癌治疗的新策略。HMGB1可能成为预测化学治疗药物敏感性的分子标志物。展开更多
A novel class of xanthan-maleic anhydride (Xan-MA)/poly(N-isopropylacrylamide) hybrid hydrogels was designed and synthesized by solution polymerization. The xanthan-based precursor (Xan-MA) was prepared by substitutin...A novel class of xanthan-maleic anhydride (Xan-MA)/poly(N-isopropylacrylamide) hybrid hydrogels was designed and synthesized by solution polymerization. The xanthan-based precursor (Xan-MA) was prepared by substituting the hydroxyl groups in Xan by MA. This Xan-MA precursor was then polymerized with a known temperature sensitive precursor (N-isopropylacrylamide, NIPAAm) to form hybrid hydrogels with a series range of composition ratio of Xan-MA to NIPAAm precursors. These smart hydrogels were characterized by Fourier transform infrared spectroscopy for structural determination, differential scanning calorimertry for thermal property. And maximum swelling ratio, swelling kinetics and temperature response kinetics were studied. The data obtained clearly show that these smart hydrogels are responsive to the external changes of temperature as well as pH value. The magnitudes of smart and hydrogel properties of these hybrid hydrogels depend on the feed composition ratio of the two precursors. With the increase of the content of Xan-MA the maximum swelling ratio, reswelling ratio and thermo-sensitivities increase, and the feed composition ratio of Xan-MA/NIPAAm increases the maximum swelling ratio augment from 13.88 to 23.21. From XMN0, XMN1, XMN3 to XMN5, the lower critical solution temperatures (LCSTs) are 33.02, 36.15, 40.28 and 41.92 ℃, respectively. By changing the composition ratio of these two precursors, the LCST of the hybrid hydrogels could also be adjusted to be or near the body temperature for the potential applications in bioengineering and biotechnology fields.展开更多
文摘A novel class of xanthan-maleic anhydride (Xan-MA)/poly(N-isopropylacrylamide) hybrid hydrogels was designed and synthesized by solution polymerization. The xanthan-based precursor (Xan-MA) was prepared by substituting the hydroxyl groups in Xan by MA. This Xan-MA precursor was then polymerized with a known temperature sensitive precursor (N-isopropylacrylamide, NIPAAm) to form hybrid hydrogels with a series range of composition ratio of Xan-MA to NIPAAm precursors. These smart hydrogels were characterized by Fourier transform infrared spectroscopy for structural determination, differential scanning calorimertry for thermal property. And maximum swelling ratio, swelling kinetics and temperature response kinetics were studied. The data obtained clearly show that these smart hydrogels are responsive to the external changes of temperature as well as pH value. The magnitudes of smart and hydrogel properties of these hybrid hydrogels depend on the feed composition ratio of the two precursors. With the increase of the content of Xan-MA the maximum swelling ratio, reswelling ratio and thermo-sensitivities increase, and the feed composition ratio of Xan-MA/NIPAAm increases the maximum swelling ratio augment from 13.88 to 23.21. From XMN0, XMN1, XMN3 to XMN5, the lower critical solution temperatures (LCSTs) are 33.02, 36.15, 40.28 and 41.92 ℃, respectively. By changing the composition ratio of these two precursors, the LCST of the hybrid hydrogels could also be adjusted to be or near the body temperature for the potential applications in bioengineering and biotechnology fields.
