<div style="text-align:justify;"> Based on the detailed interpretation of high-accuracy 3D seismic data, the characteristics of regional unconformities, fracture systems, sedimentary filling and paleo-...<div style="text-align:justify;"> Based on the detailed interpretation of high-accuracy 3D seismic data, the characteristics of regional unconformities, fracture systems, sedimentary filling and paleo-stress field in Zhu 1 depression were comprehensively analyzed. The results showed that 2nd episode of Zhu-Qiong movement was an important tectonic transformation that occurred during rifting, basin structure patterns above and below the regional angular unconformity caused by 2nd episode had distinct differences. The orientations of those basin-controlling faults changed from NE, NEE to EW, NWW, which indicated that the paleo-stress field veered from NNW extension clockwise to sub-NS extension and basin structures patterns transformed from NE, NEE strong rifting to sub-EW, NWW weak rifting. The depocenter showed seesaw-like migration from S to N. And the sedimentary systems transformed from semi-deep-deep lacustrine facies to braided river delta facies developed in shore-shallow lacustrine. Combined with its tectonic recombination of periphery plates that period, the mechanism of above tectonic transformation had direct correspondence to the readjustment of the Indian plate and the Pacific plate. The southward subduction of the pro-to-south China Sea is the direct cause of this tectonic transformation. </div>展开更多
背景:正畸牙移动骨重塑的机械力信号转导通路及其调控机制是正畸生物力学和生物学研究的热点。目前正畸牙移动过程中张力侧牙周膜细胞对机械刺激反应的复杂分子信号网络机制尚不太明确。目的:探究正畸牙移动过程中张应力作用下高迁移率...背景:正畸牙移动骨重塑的机械力信号转导通路及其调控机制是正畸生物力学和生物学研究的热点。目前正畸牙移动过程中张力侧牙周膜细胞对机械刺激反应的复杂分子信号网络机制尚不太明确。目的:探究正畸牙移动过程中张应力作用下高迁移率族蛋白B1(high mobility group protein 1,HMGB1)和ERK1/2通路对人牙周膜细胞自噬的影响。方法:选取第3-5代生长状态良好的人牙周膜细胞,施加周期性张应力,利用免疫荧光观察HMGB1在细胞中的分布情况,RT-qPCR及Westernblot检测自噬相关蛋白LC3-Ⅱ、Beclin-1和HMGB1的表达水平,完成张应力加载后分别提取胞核蛋白和胞浆蛋白,Westernblot分别检测胞核及胞浆中HMGB1蛋白水平。为探究HMGB1通过何种机制参与调控细胞自噬,使用丙酮酸乙酯(HMGB1胞浆抑制剂)进行细胞处理,通过免疫荧光、RT-qPCR和Western blot检测细胞自噬水平。最后,选用PD98059抑制ERK1/2通路,通过RT-qPCR以及Western blot检测自噬水平变化,探讨HMGB1通过ERK1/2通路调控自噬的机制。结果与结论:(1)通过体外张应力加载,诱导了人牙周膜细胞内自噬水平升高,HMGB1的表达增加,同时HMGB1发生了由胞核到胞质的转位;(2)人牙周膜细胞通过HMGB1核质转位机制参与张应力作用下自噬的调控;(3)使用ERK1/2通路抑制剂PD98059显著抑制了张应力作用下HMGB1引起的细胞自噬;(4)结果表明,张应力作用下HMGB1从细胞核转移到细胞质,并通过ERK1/2途径调节自噬,维持人牙周膜细胞的稳态和牙周动态平衡。展开更多
目的:在大鼠处于正畸牙保持期时,以全身施药辛伐他汀的方法,来研究其对牙周组织中骨形成蛋白2(bone morphogenetic protein 2,BMP-2)表达的影响。方法:选用78只8周龄雄性Wistar大鼠,随机分成3组。1)空白对照组:将大鼠的前牙实施连轧,将...目的:在大鼠处于正畸牙保持期时,以全身施药辛伐他汀的方法,来研究其对牙周组织中骨形成蛋白2(bone morphogenetic protein 2,BMP-2)表达的影响。方法:选用78只8周龄雄性Wistar大鼠,随机分成3组。1)空白对照组:将大鼠的前牙实施连轧,将其作为支抗,向近中的方向牵移上颌两侧的第一磨牙,持续进行21d之后将其处死。2)构建牙移动模型的对照组,21d之后,在左侧的上颌安装相应的保持装置,各保持1、3、7、14、21、28d,在保持期内,给予注射腹腔生理盐水。3)实验组:改组的保持及加力措施与对照组相同,在保持期期间,给予注射腹腔辛伐他汀。在保持期结束之后,采用免疫组化染色法,并结合定量分析法,对移动牙的牙周组织内的BMP-2水平进行检测和观察。结果:在整个保持期,对照组的BMP-2量逐渐减少,实验组呈逐渐增加的趋势。相同时间的实验用药组与实验对照组比较,实验组的BMP-2量较于对照组普遍要高。除了对照组中的第28天组之外,其余各小组BMP-2的表达强度均强于空白对照组(P<0.01)。结论:腹腔注射辛伐他汀能够增加大鼠实验性牙移动后保持阶段牙周组织中BMP-2的表达,从而促进骨细胞的生成、骨质矿化。展开更多
文摘<div style="text-align:justify;"> Based on the detailed interpretation of high-accuracy 3D seismic data, the characteristics of regional unconformities, fracture systems, sedimentary filling and paleo-stress field in Zhu 1 depression were comprehensively analyzed. The results showed that 2nd episode of Zhu-Qiong movement was an important tectonic transformation that occurred during rifting, basin structure patterns above and below the regional angular unconformity caused by 2nd episode had distinct differences. The orientations of those basin-controlling faults changed from NE, NEE to EW, NWW, which indicated that the paleo-stress field veered from NNW extension clockwise to sub-NS extension and basin structures patterns transformed from NE, NEE strong rifting to sub-EW, NWW weak rifting. The depocenter showed seesaw-like migration from S to N. And the sedimentary systems transformed from semi-deep-deep lacustrine facies to braided river delta facies developed in shore-shallow lacustrine. Combined with its tectonic recombination of periphery plates that period, the mechanism of above tectonic transformation had direct correspondence to the readjustment of the Indian plate and the Pacific plate. The southward subduction of the pro-to-south China Sea is the direct cause of this tectonic transformation. </div>
文摘背景:正畸牙移动骨重塑的机械力信号转导通路及其调控机制是正畸生物力学和生物学研究的热点。目前正畸牙移动过程中张力侧牙周膜细胞对机械刺激反应的复杂分子信号网络机制尚不太明确。目的:探究正畸牙移动过程中张应力作用下高迁移率族蛋白B1(high mobility group protein 1,HMGB1)和ERK1/2通路对人牙周膜细胞自噬的影响。方法:选取第3-5代生长状态良好的人牙周膜细胞,施加周期性张应力,利用免疫荧光观察HMGB1在细胞中的分布情况,RT-qPCR及Westernblot检测自噬相关蛋白LC3-Ⅱ、Beclin-1和HMGB1的表达水平,完成张应力加载后分别提取胞核蛋白和胞浆蛋白,Westernblot分别检测胞核及胞浆中HMGB1蛋白水平。为探究HMGB1通过何种机制参与调控细胞自噬,使用丙酮酸乙酯(HMGB1胞浆抑制剂)进行细胞处理,通过免疫荧光、RT-qPCR和Western blot检测细胞自噬水平。最后,选用PD98059抑制ERK1/2通路,通过RT-qPCR以及Western blot检测自噬水平变化,探讨HMGB1通过ERK1/2通路调控自噬的机制。结果与结论:(1)通过体外张应力加载,诱导了人牙周膜细胞内自噬水平升高,HMGB1的表达增加,同时HMGB1发生了由胞核到胞质的转位;(2)人牙周膜细胞通过HMGB1核质转位机制参与张应力作用下自噬的调控;(3)使用ERK1/2通路抑制剂PD98059显著抑制了张应力作用下HMGB1引起的细胞自噬;(4)结果表明,张应力作用下HMGB1从细胞核转移到细胞质,并通过ERK1/2途径调节自噬,维持人牙周膜细胞的稳态和牙周动态平衡。
文摘目的:在大鼠处于正畸牙保持期时,以全身施药辛伐他汀的方法,来研究其对牙周组织中骨形成蛋白2(bone morphogenetic protein 2,BMP-2)表达的影响。方法:选用78只8周龄雄性Wistar大鼠,随机分成3组。1)空白对照组:将大鼠的前牙实施连轧,将其作为支抗,向近中的方向牵移上颌两侧的第一磨牙,持续进行21d之后将其处死。2)构建牙移动模型的对照组,21d之后,在左侧的上颌安装相应的保持装置,各保持1、3、7、14、21、28d,在保持期内,给予注射腹腔生理盐水。3)实验组:改组的保持及加力措施与对照组相同,在保持期期间,给予注射腹腔辛伐他汀。在保持期结束之后,采用免疫组化染色法,并结合定量分析法,对移动牙的牙周组织内的BMP-2水平进行检测和观察。结果:在整个保持期,对照组的BMP-2量逐渐减少,实验组呈逐渐增加的趋势。相同时间的实验用药组与实验对照组比较,实验组的BMP-2量较于对照组普遍要高。除了对照组中的第28天组之外,其余各小组BMP-2的表达强度均强于空白对照组(P<0.01)。结论:腹腔注射辛伐他汀能够增加大鼠实验性牙移动后保持阶段牙周组织中BMP-2的表达,从而促进骨细胞的生成、骨质矿化。
