Airblasts,as one common phenomenon accompanied by rapid movements of landslides or rock/snow avalanches,commonly result in catastrophic damages and are attracting more and more scientific attention.To quantitatively a...Airblasts,as one common phenomenon accompanied by rapid movements of landslides or rock/snow avalanches,commonly result in catastrophic damages and are attracting more and more scientific attention.To quantitatively analyze the intensity of airblast initiated by landslides,the Wangjiayan landslide,occurred in the Wenchuan earthquake,is selected here with the landslide propagation and airblast evolution being studied using FLUENT by introducing the Voellmy rheological law.The results reveal that:(1)For the Wangjiayan landslide,its whole travelling duration is only 12 s with its maximum velocity reaching 36 m/s at t=10 s;(2)corresponding to the landslide propagation,the maximum velocity,28 m/s,of the airblast initiated by the landslide also appears at t=10 s with its maximum pressure reaching594.8 Pa,which is equivalent to violent storm;(3)under the attack of airblast,the load suffered by buildings in the airblast zone increases to 1300 Pa at t=9.4 s and sharply decreased to-7000 Pa as the rapid decrease of the velocity of the sliding mass at t=10 s,which is seriously unfavorable for buildings and might be the key reason for the destructive collapse of buildings in the airblast zone of the Wangjiayan landslide.展开更多
目的探讨驱动蛋白家族成员11(kinesin family member 11,KIF11)、β-连环蛋白(β-catenin)、糖原合成酶激酶-3β(glycogen synthase kinase-3β,GSK-3β)在宫颈癌中的表达情况及临床意义。方法采用免疫组化法检测KIF11、β-catenin、GS...目的探讨驱动蛋白家族成员11(kinesin family member 11,KIF11)、β-连环蛋白(β-catenin)、糖原合成酶激酶-3β(glycogen synthase kinase-3β,GSK-3β)在宫颈癌中的表达情况及临床意义。方法采用免疫组化法检测KIF11、β-catenin、GSK-3β在102例宫颈癌、52例高级别鳞状上皮内病变(high-grade squamous intraepithelial lesion,HSIL)、46例低级别鳞状上皮内病变(low-grade squamous intraepithelial lesion,LSIL)及40例慢性宫颈炎组织中的表达情况,分析三者的表达与宫颈癌患者临床病理特征的关系,分析三者之间的相关性,COX比例风险模型分析影响宫颈癌患者预后的影响因素。结果随着宫颈病变进展,KIF11、β-catenin阳性率逐渐升高,GSK-3β阳性率逐渐减低(P<0.05)。KIF11、β-catenin、GSK-3β在宫颈癌组织中的阳性表达在国际妇产科联盟(International Federation of Gynecology and Obstetrics,FIGO)分期、分化程度、淋巴结转移方面比较,差异有统计学意义(P<0.05),但在不同年龄及病理类型间比较,差异无统计学意义(P>0.05)。宫颈癌患者组织中KIF11与β-catenin的表达呈正相关(r=0.461,P<0.05),β-catenin与GSK-3β的表达呈负相关(r=-0.692,P<0.05),KIF11与GSK-3β的表达呈负相关(r=-0.336,P<0.05)。KIF11、β-catenin阳性表达患者的平均生存时间短于阴性表达患者,GSK-3β阳性表达患者的平均生存时间长于阴性表达患者。COX回归分析显示,FIGO分期、淋巴结转移、KIF11、β-catenin为宫颈癌患者预后的独立危险因素,GSK-3β为独立保护因素。结论KIF11、β-catenin、GSK-3β在宫颈癌患者组织中异常表达,KIF11可能参与宫颈癌发生、发展中Wnt/β-catenin通路的调节,三者联合检测可为宫颈癌的诊断及预后提供新的参考。展开更多
目的:探讨罗汉果皂苷V(MV)对铁死亡诱导剂RAS选择性致死分子3(RSL3)诱导的人神经母细胞瘤SH-SY5Y细胞铁死亡的抑制作用及可能机制。方法:用RSL3诱导SH-SY5Y细胞建立铁死亡模型。MTT法检测细胞活力;倒置显微镜观察细胞形态;亚铁离子荧光...目的:探讨罗汉果皂苷V(MV)对铁死亡诱导剂RAS选择性致死分子3(RSL3)诱导的人神经母细胞瘤SH-SY5Y细胞铁死亡的抑制作用及可能机制。方法:用RSL3诱导SH-SY5Y细胞建立铁死亡模型。MTT法检测细胞活力;倒置显微镜观察细胞形态;亚铁离子荧光探针FerroFarRed检测细胞内亚铁离子含量;线粒体红色荧光探针MitoTracker Red CMXRos检测线粒体膜电位(MMP);超氧化物阴离子荧光探针二氢乙啶和线粒体超氧化物红色荧光探针MitoSoX Red分别检测细胞内和线粒体内活性氧(ROS)。微板法检测细胞谷胱甘肽(GSH)和丙二醛(MDA)水平。Western blot检测脂酰辅酶A合成酶长链家族成员4(ACSL4)、环加氧酶2(COX-2、)谷胱甘肽过氧化物酶4(GPX4)和溶质载体家族7成员11(SLC7A11)蛋白表达水平。分子对接技术预测MV与ACSL4、COX-2、GPX4和SLC7A11的靶向关系。结果:与control组相比,RSL3组SH-SY5Y细胞活力显著降低(P<0.01),细胞内亚铁离子含量、细胞内和线粒体内ROS水平及MDA水平显著升高(P<0.05或P<0.01),MMP和GSH水平显著降低(P<0.01),ACSL4和COX-2蛋白表达水平显著升高,而GPX4和SLC7A11蛋白表达水平显著降低(P<0.01),提示成功建立了细胞铁死亡模型。MV处理使细胞活力显著升高(P<0.05),细胞内亚铁离子含量、细胞内和线粒体内ROS水平及MDA水平显著降低(P<0.01),MMP和GSH水平显著升高(P<0.05或P<0.01);ACSL4和COX-2蛋白水平显著降低,而GPX4和SLC7A11蛋白水平显著升高(P<0.05或P<0.01)。分子对接结果显示,MV与铁死亡核心蛋白ACSL4、COX-2、GPX4和SLC7A11存在结合位点。结论:MV可抑制RSL3诱导的SH-SY5Y细胞铁死亡的发生,其机制可能与激活SLC7A11/GPX4和抑制ACSL4/COX-2有关。展开更多
基金supported by the National Natural Science Foundation of China(42322702,42177131)。
文摘Airblasts,as one common phenomenon accompanied by rapid movements of landslides or rock/snow avalanches,commonly result in catastrophic damages and are attracting more and more scientific attention.To quantitatively analyze the intensity of airblast initiated by landslides,the Wangjiayan landslide,occurred in the Wenchuan earthquake,is selected here with the landslide propagation and airblast evolution being studied using FLUENT by introducing the Voellmy rheological law.The results reveal that:(1)For the Wangjiayan landslide,its whole travelling duration is only 12 s with its maximum velocity reaching 36 m/s at t=10 s;(2)corresponding to the landslide propagation,the maximum velocity,28 m/s,of the airblast initiated by the landslide also appears at t=10 s with its maximum pressure reaching594.8 Pa,which is equivalent to violent storm;(3)under the attack of airblast,the load suffered by buildings in the airblast zone increases to 1300 Pa at t=9.4 s and sharply decreased to-7000 Pa as the rapid decrease of the velocity of the sliding mass at t=10 s,which is seriously unfavorable for buildings and might be the key reason for the destructive collapse of buildings in the airblast zone of the Wangjiayan landslide.
文摘目的探讨驱动蛋白家族成员11(kinesin family member 11,KIF11)、β-连环蛋白(β-catenin)、糖原合成酶激酶-3β(glycogen synthase kinase-3β,GSK-3β)在宫颈癌中的表达情况及临床意义。方法采用免疫组化法检测KIF11、β-catenin、GSK-3β在102例宫颈癌、52例高级别鳞状上皮内病变(high-grade squamous intraepithelial lesion,HSIL)、46例低级别鳞状上皮内病变(low-grade squamous intraepithelial lesion,LSIL)及40例慢性宫颈炎组织中的表达情况,分析三者的表达与宫颈癌患者临床病理特征的关系,分析三者之间的相关性,COX比例风险模型分析影响宫颈癌患者预后的影响因素。结果随着宫颈病变进展,KIF11、β-catenin阳性率逐渐升高,GSK-3β阳性率逐渐减低(P<0.05)。KIF11、β-catenin、GSK-3β在宫颈癌组织中的阳性表达在国际妇产科联盟(International Federation of Gynecology and Obstetrics,FIGO)分期、分化程度、淋巴结转移方面比较,差异有统计学意义(P<0.05),但在不同年龄及病理类型间比较,差异无统计学意义(P>0.05)。宫颈癌患者组织中KIF11与β-catenin的表达呈正相关(r=0.461,P<0.05),β-catenin与GSK-3β的表达呈负相关(r=-0.692,P<0.05),KIF11与GSK-3β的表达呈负相关(r=-0.336,P<0.05)。KIF11、β-catenin阳性表达患者的平均生存时间短于阴性表达患者,GSK-3β阳性表达患者的平均生存时间长于阴性表达患者。COX回归分析显示,FIGO分期、淋巴结转移、KIF11、β-catenin为宫颈癌患者预后的独立危险因素,GSK-3β为独立保护因素。结论KIF11、β-catenin、GSK-3β在宫颈癌患者组织中异常表达,KIF11可能参与宫颈癌发生、发展中Wnt/β-catenin通路的调节,三者联合检测可为宫颈癌的诊断及预后提供新的参考。
基金Key Project Process Mechanism and Prediction of Geological Hazards (2001CB711005-1-3) and State Key Basic Research Project Mechanism and Prediction of Continental Earthquakes (G1998040702). sponsored by the Ministry of Science and Techno
文摘目的:探讨罗汉果皂苷V(MV)对铁死亡诱导剂RAS选择性致死分子3(RSL3)诱导的人神经母细胞瘤SH-SY5Y细胞铁死亡的抑制作用及可能机制。方法:用RSL3诱导SH-SY5Y细胞建立铁死亡模型。MTT法检测细胞活力;倒置显微镜观察细胞形态;亚铁离子荧光探针FerroFarRed检测细胞内亚铁离子含量;线粒体红色荧光探针MitoTracker Red CMXRos检测线粒体膜电位(MMP);超氧化物阴离子荧光探针二氢乙啶和线粒体超氧化物红色荧光探针MitoSoX Red分别检测细胞内和线粒体内活性氧(ROS)。微板法检测细胞谷胱甘肽(GSH)和丙二醛(MDA)水平。Western blot检测脂酰辅酶A合成酶长链家族成员4(ACSL4)、环加氧酶2(COX-2、)谷胱甘肽过氧化物酶4(GPX4)和溶质载体家族7成员11(SLC7A11)蛋白表达水平。分子对接技术预测MV与ACSL4、COX-2、GPX4和SLC7A11的靶向关系。结果:与control组相比,RSL3组SH-SY5Y细胞活力显著降低(P<0.01),细胞内亚铁离子含量、细胞内和线粒体内ROS水平及MDA水平显著升高(P<0.05或P<0.01),MMP和GSH水平显著降低(P<0.01),ACSL4和COX-2蛋白表达水平显著升高,而GPX4和SLC7A11蛋白表达水平显著降低(P<0.01),提示成功建立了细胞铁死亡模型。MV处理使细胞活力显著升高(P<0.05),细胞内亚铁离子含量、细胞内和线粒体内ROS水平及MDA水平显著降低(P<0.01),MMP和GSH水平显著升高(P<0.05或P<0.01);ACSL4和COX-2蛋白水平显著降低,而GPX4和SLC7A11蛋白水平显著升高(P<0.05或P<0.01)。分子对接结果显示,MV与铁死亡核心蛋白ACSL4、COX-2、GPX4和SLC7A11存在结合位点。结论:MV可抑制RSL3诱导的SH-SY5Y细胞铁死亡的发生,其机制可能与激活SLC7A11/GPX4和抑制ACSL4/COX-2有关。
